PicoTCP - Free (GPLv2) TCP/IP stack developed by TASS Belgi…

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Free (GPLv2) TCP/IP stack developed by TASS Belgium

Dependents: lpc1768-picotcp-demo ZeroMQ_PicoTCP_Publisher_demo TCPSocket_HelloWorld_PicoTCP Pico_TCP_UDP_Test ... more

PicoTCP. Copyright (c) 2013 TASS Belgium NV.

Released under the GNU General Public License, version 2.

Different licensing models may exist, at the sole discretion of the Copyright holders.

Official homepage: http://www.picotcp.com

Bug tracker: https://github.com/tass-belgium/picotcp/issues

Development steps:

~~initial integration with mbed RTOS~~
~~generic mbed Ethernet driver~~
~~high performance NXP LPC1768 specific Ethernet driver~~
~~Multi-threading support for mbed RTOS~~
~~Berkeley sockets and integration with the New Socket API~~
~~Fork of the apps running on top of the New Socket API~~
~~Scheduling optimizations~~
Debugging/benchmarking/testing

Demo application (measuring TCP sender performance):

Import program lpc1768-picotcp-demo

A PicoTCP demo app testing the ethernet throughput on the lpc1768 mbed board.

modules/pico_tcp.c@37:bdf736327c71, 2013-07-03 (annotated)

Committer:: tass
Date:: Wed Jul 03 08:56:01 2013 +0000
Revision:: 37:bdf736327c71
Parent:: 36:afa3ab5e06b3
Child:: 40:c8ab0d2bba0b

Added DNS calls to stack interface.; Integrated the DNS feature in Endpoint.; Fixed incomplete data receiving.;

Who changed what in which revision?

User	Revision	Line number	New contents of line
daniele	29:1a47b7151851	1	/*********************************************************************
daniele	29:1a47b7151851	2	PicoTCP. Copyright (c) 2012 TASS Belgium NV. Some rights reserved.
daniele	29:1a47b7151851	3	See LICENSE and COPYING for usage.
daniele	29:1a47b7151851	4
daniele	29:1a47b7151851	5	.
daniele	29:1a47b7151851	6
daniele	29:1a47b7151851	7	Authors: Daniele Lacamera, Philippe Mariman
daniele	29:1a47b7151851	8	*********************************************************************/
daniele	29:1a47b7151851	9
daniele	29:1a47b7151851	10	#include "pico_tcp.h"
daniele	29:1a47b7151851	11	#include "pico_config.h"
daniele	29:1a47b7151851	12	#include "pico_eth.h"
daniele	29:1a47b7151851	13	#include "pico_socket.h"
daniele	29:1a47b7151851	14	#include "pico_stack.h"
daniele	29:1a47b7151851	15	#include "pico_socket.h"
daniele	29:1a47b7151851	16	#include "pico_queue.h"
daniele	29:1a47b7151851	17	#include "pico_tree.h"
daniele	29:1a47b7151851	18
daniele	29:1a47b7151851	19	#define TCP_SOCK(s) ((struct pico_socket_tcp *)s)
daniele	29:1a47b7151851	20	#define SEQN(f) (f?(long_be(((struct pico_tcp_hdr *)(f->transport_hdr))->seq)):0)
daniele	29:1a47b7151851	21	#define ACKN(f) (f?(long_be(((struct pico_tcp_hdr *)(f->transport_hdr))->ack)):0)
daniele	29:1a47b7151851	22
daniele	29:1a47b7151851	23	#define PICO_TCP_RTO_MIN 10
daniele	29:1a47b7151851	24	#define PICO_TCP_RTO_MAX 120000
tass	37:bdf736327c71	25	#define PICO_TCP_IW 2
tass	37:bdf736327c71	26	#define PICO_TCP_SYN_TO 1000
daniele	29:1a47b7151851	27
daniele	29:1a47b7151851	28	#define PICO_TCP_MAX_CONNECT_RETRIES 7
daniele	29:1a47b7151851	29
daniele	29:1a47b7151851	30	#define PICO_TCP_LOOKAHEAD 0x00
daniele	29:1a47b7151851	31	#define PICO_TCP_FIRST_DUPACK 0x01
daniele	29:1a47b7151851	32	#define PICO_TCP_SECOND_DUPACK 0x02
daniele	29:1a47b7151851	33	#define PICO_TCP_RECOVER 0x03
daniele	29:1a47b7151851	34	#define PICO_TCP_BLACKOUT 0x04
daniele	29:1a47b7151851	35	#define PICO_TCP_UNREACHABLE 0x05
daniele	29:1a47b7151851	36	#define PICO_TCP_WINDOW_FULL 0x06
daniele	29:1a47b7151851	37
daniele	29:1a47b7151851	38	/* check if the Nagle algorithm is enabled on the socket */
daniele	29:1a47b7151851	39	#define IS_NAGLE_ENABLED(s) (!(!(!(s->opt_flags & (1 << PICO_SOCKET_OPT_TCPNODELAY)))))
daniele	29:1a47b7151851	40	/* check if tcp connection is "idle" according to Nagle (RFC 896) */
daniele	29:1a47b7151851	41	#define IS_TCP_IDLE(t) ((t->in_flight == 0) && (t->tcpq_out.size == 0))
daniele	29:1a47b7151851	42	/* check if the hold queue contains data (again Nagle) */
daniele	29:1a47b7151851	43	#define IS_TCP_HOLDQ_EMPTY(t) (t->tcpq_hold.size == 0)
daniele	29:1a47b7151851	44
daniele	29:1a47b7151851	45	#ifdef PICO_SUPPORT_TCP
daniele	29:1a47b7151851	46	#define tcp_dbg(...) do{}while(0)
daniele	29:1a47b7151851	47	//#define tcp_dbg dbg
daniele	29:1a47b7151851	48
daniele	29:1a47b7151851	49
daniele	29:1a47b7151851	50	#ifdef PICO_SUPPORT_MUTEX
daniele	29:1a47b7151851	51	static void * Mutex = NULL;
daniele	29:1a47b7151851	52	#define LOCK(x) {\
daniele	29:1a47b7151851	53	if (x == NULL) \
daniele	29:1a47b7151851	54	x = pico_mutex_init(); \
daniele	29:1a47b7151851	55	pico_mutex_lock(x); \
daniele	29:1a47b7151851	56	}
daniele	29:1a47b7151851	57	#define UNLOCK(x) pico_mutex_unlock(x);
daniele	29:1a47b7151851	58
daniele	29:1a47b7151851	59	#else
daniele	29:1a47b7151851	60	#define LOCK(x) do{}while(0)
daniele	29:1a47b7151851	61	#define UNLOCK(x) do{}while(0)
daniele	29:1a47b7151851	62	#endif
daniele	29:1a47b7151851	63
daniele	29:1a47b7151851	64
daniele	29:1a47b7151851	65	static inline int seq_compare(uint32_t a, uint32_t b)
daniele	29:1a47b7151851	66	{
daniele	29:1a47b7151851	67	uint32_t thresh = ((uint32_t)(-1))>>1;
daniele	29:1a47b7151851	68	if (((a > thresh) && (b > thresh)) \|\| ((a <= thresh) && (b <= thresh))) {
daniele	29:1a47b7151851	69	if (a > b)
daniele	29:1a47b7151851	70	return 1;
daniele	29:1a47b7151851	71	if (b > a)
daniele	29:1a47b7151851	72	return -1;
daniele	29:1a47b7151851	73	} else {
daniele	29:1a47b7151851	74	if (a > b)
daniele	29:1a47b7151851	75	return -2;
daniele	29:1a47b7151851	76	if (b > a)
daniele	29:1a47b7151851	77	return 2;
daniele	29:1a47b7151851	78	}
daniele	29:1a47b7151851	79	return 0;
daniele	29:1a47b7151851	80	}
daniele	29:1a47b7151851	81
daniele	29:1a47b7151851	82	static int segment_compare(void * ka, void * kb)
daniele	29:1a47b7151851	83	{
daniele	29:1a47b7151851	84	struct pico_frame a = ka, b = kb;
daniele	29:1a47b7151851	85	return seq_compare(SEQN(a), SEQN(b));
daniele	29:1a47b7151851	86	}
daniele	29:1a47b7151851	87
daniele	29:1a47b7151851	88	struct pico_tcp_queue
daniele	29:1a47b7151851	89	{
daniele	29:1a47b7151851	90	struct pico_tree pool;
daniele	29:1a47b7151851	91	uint32_t max_size;
daniele	29:1a47b7151851	92	uint32_t size;
daniele	29:1a47b7151851	93	uint32_t frames;
daniele	29:1a47b7151851	94	};
daniele	29:1a47b7151851	95
daniele	29:1a47b7151851	96	static struct pico_frame peek_segment(struct pico_tcp_queue tq, uint32_t seq)
daniele	29:1a47b7151851	97	{
daniele	29:1a47b7151851	98	struct pico_tcp_hdr H;
daniele	29:1a47b7151851	99	struct pico_frame f = {};
daniele	29:1a47b7151851	100	f.transport_hdr = (uint8_t *) (&H);
daniele	29:1a47b7151851	101	H.seq = long_be(seq);
daniele	29:1a47b7151851	102
daniele	29:1a47b7151851	103	return pico_tree_findKey(&tq->pool,&f);
daniele	29:1a47b7151851	104	}
daniele	29:1a47b7151851	105
daniele	29:1a47b7151851	106	static struct pico_frame first_segment(struct pico_tcp_queue tq)
daniele	29:1a47b7151851	107	{
daniele	29:1a47b7151851	108	return pico_tree_first(&tq->pool);
daniele	29:1a47b7151851	109	}
daniele	29:1a47b7151851	110
daniele	29:1a47b7151851	111	static struct pico_frame next_segment(struct pico_tcp_queue tq, struct pico_frame *cur)
daniele	29:1a47b7151851	112	{
daniele	29:1a47b7151851	113	if (!cur)
daniele	29:1a47b7151851	114	return NULL;
daniele	29:1a47b7151851	115	return peek_segment(tq, SEQN(cur) + cur->payload_len);
daniele	29:1a47b7151851	116	}
daniele	29:1a47b7151851	117
daniele	29:1a47b7151851	118	static int pico_enqueue_segment(struct pico_tcp_queue tq, struct pico_frame f)
daniele	29:1a47b7151851	119	{
daniele	29:1a47b7151851	120	int ret = -1;
daniele	29:1a47b7151851	121	if (f->payload_len <= 0) {
daniele	29:1a47b7151851	122	tcp_dbg("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! TRIED TO ENQUEUE INVALID SEGMENT!\n");
daniele	29:1a47b7151851	123	//abort();
daniele	29:1a47b7151851	124	return -1;
daniele	29:1a47b7151851	125	}
daniele	29:1a47b7151851	126	LOCK(Mutex);
daniele	29:1a47b7151851	127	if ((tq->size + f->payload_len) > tq->max_size)
daniele	29:1a47b7151851	128	{
daniele	29:1a47b7151851	129	ret = 0;
daniele	29:1a47b7151851	130	goto out;
daniele	29:1a47b7151851	131	}
daniele	29:1a47b7151851	132	if (pico_tree_insert(&tq->pool,f) != 0)
daniele	29:1a47b7151851	133	{
daniele	29:1a47b7151851	134	ret = 0;
daniele	29:1a47b7151851	135	goto out;
daniele	29:1a47b7151851	136	}
daniele	29:1a47b7151851	137	tq->size += f->payload_len;
daniele	29:1a47b7151851	138	if (f->payload_len > 0)
daniele	29:1a47b7151851	139	tq->frames++;
daniele	29:1a47b7151851	140	ret = f->payload_len;
daniele	29:1a47b7151851	141
daniele	29:1a47b7151851	142	out :
daniele	29:1a47b7151851	143	UNLOCK(Mutex);
daniele	29:1a47b7151851	144	return ret;
daniele	29:1a47b7151851	145	}
daniele	29:1a47b7151851	146
daniele	29:1a47b7151851	147	static void pico_discard_segment(struct pico_tcp_queue tq, struct pico_frame f)
daniele	29:1a47b7151851	148	{
daniele	29:1a47b7151851	149	struct pico_frame *f1;
daniele	29:1a47b7151851	150	LOCK(Mutex);
daniele	29:1a47b7151851	151	f1 = pico_tree_delete(&tq->pool,f);
daniele	29:1a47b7151851	152	if (f1) {
daniele	29:1a47b7151851	153	tq->size -= f->payload_len;
daniele	29:1a47b7151851	154	if (f->payload_len > 0)
daniele	29:1a47b7151851	155	tq->frames--;
daniele	29:1a47b7151851	156	}
daniele	29:1a47b7151851	157	pico_frame_discard(f);
daniele	29:1a47b7151851	158	UNLOCK(Mutex);
daniele	29:1a47b7151851	159	}
daniele	29:1a47b7151851	160
daniele	29:1a47b7151851	161	/* Structure for TCP socket */
daniele	29:1a47b7151851	162	struct tcp_sack_block {
daniele	29:1a47b7151851	163	uint32_t left;
daniele	29:1a47b7151851	164	uint32_t right;
daniele	29:1a47b7151851	165	struct tcp_sack_block *next;
daniele	29:1a47b7151851	166	};
daniele	29:1a47b7151851	167
daniele	29:1a47b7151851	168	struct pico_socket_tcp {
daniele	29:1a47b7151851	169	struct pico_socket sock;
daniele	29:1a47b7151851	170
daniele	29:1a47b7151851	171	/* Tree/queues */
daniele	29:1a47b7151851	172	struct pico_tcp_queue tcpq_in;
daniele	29:1a47b7151851	173	struct pico_tcp_queue tcpq_out;
daniele	29:1a47b7151851	174	struct pico_tcp_queue tcpq_hold; /* buffer to hold delayed frames according to Nagle */
daniele	29:1a47b7151851	175
daniele	29:1a47b7151851	176	/* tcp_output */
daniele	29:1a47b7151851	177	uint32_t snd_nxt;
daniele	29:1a47b7151851	178	uint32_t snd_last;
daniele	29:1a47b7151851	179	uint32_t snd_old_ack;
daniele	29:1a47b7151851	180	uint32_t snd_retry;
daniele	29:1a47b7151851	181	uint32_t snd_last_out;
daniele	29:1a47b7151851	182
daniele	29:1a47b7151851	183	/* congestion control */
daniele	29:1a47b7151851	184	uint32_t avg_rtt;
daniele	29:1a47b7151851	185	uint32_t rttvar;
daniele	29:1a47b7151851	186	uint32_t rto;
daniele	29:1a47b7151851	187	uint32_t in_flight;
daniele	29:1a47b7151851	188	uint8_t timer_running;
daniele	29:1a47b7151851	189	uint8_t keepalive_timer_running;
daniele	29:1a47b7151851	190	uint16_t cwnd_counter;
daniele	29:1a47b7151851	191	uint16_t cwnd;
daniele	29:1a47b7151851	192	uint16_t ssthresh;
daniele	29:1a47b7151851	193	uint16_t recv_wnd;
daniele	29:1a47b7151851	194	uint16_t recv_wnd_scale;
daniele	29:1a47b7151851	195
daniele	29:1a47b7151851	196	/* tcp_input */
daniele	29:1a47b7151851	197	uint32_t rcv_nxt;
daniele	29:1a47b7151851	198	uint32_t rcv_ackd;
daniele	29:1a47b7151851	199	uint32_t rcv_processed;
daniele	29:1a47b7151851	200	uint16_t wnd;
daniele	29:1a47b7151851	201	uint16_t wnd_scale;
daniele	29:1a47b7151851	202
daniele	29:1a47b7151851	203	/* options */
daniele	29:1a47b7151851	204	uint32_t ts_nxt;
daniele	29:1a47b7151851	205	uint16_t mss;
daniele	29:1a47b7151851	206	uint8_t sack_ok;
daniele	29:1a47b7151851	207	uint8_t ts_ok;
daniele	29:1a47b7151851	208	uint8_t mss_ok;
daniele	29:1a47b7151851	209	uint8_t scale_ok;
daniele	29:1a47b7151851	210	struct tcp_sack_block *sacks;
daniele	29:1a47b7151851	211	uint8_t jumbo;
daniele	29:1a47b7151851	212
daniele	29:1a47b7151851	213	/* Transmission */
daniele	29:1a47b7151851	214	uint8_t x_mode;
daniele	29:1a47b7151851	215	uint8_t dupacks;
daniele	29:1a47b7151851	216	uint8_t backoff;
daniele	29:1a47b7151851	217
daniele	29:1a47b7151851	218	};
daniele	29:1a47b7151851	219
daniele	29:1a47b7151851	220	/* Queues */
daniele	29:1a47b7151851	221	static struct pico_queue tcp_in = {};
daniele	29:1a47b7151851	222	static struct pico_queue tcp_out = {};
daniele	29:1a47b7151851	223
daniele	29:1a47b7151851	224	/* If Nagle enabled, this function can make 1 new segment from smaller segments in hold queue */
daniele	29:1a47b7151851	225	static struct pico_frame * pico_hold_segment_make(struct pico_socket_tcp *t);
daniele	29:1a47b7151851	226
daniele	29:1a47b7151851	227	/* checks if tcpq_in is empty */
daniele	29:1a47b7151851	228	int pico_tcp_queue_in_is_empty(struct pico_socket *s)
daniele	29:1a47b7151851	229	{
daniele	29:1a47b7151851	230	struct pico_socket_tcp t = (struct pico_socket_tcp ) s;
daniele	29:1a47b7151851	231
daniele	29:1a47b7151851	232	if (t->tcpq_in.frames == 0)
daniele	29:1a47b7151851	233	return 1;
daniele	29:1a47b7151851	234	else
daniele	29:1a47b7151851	235	return 0;
daniele	29:1a47b7151851	236	}
daniele	29:1a47b7151851	237
daniele	29:1a47b7151851	238	/* Useful for getting rid of the beginning of the buffer (read() op) */
daniele	29:1a47b7151851	239	static int release_until(struct pico_tcp_queue *q, uint32_t seq)
daniele	29:1a47b7151851	240	{
daniele	29:1a47b7151851	241	struct pico_frame *head = first_segment(q);
daniele	29:1a47b7151851	242	int ret = 0;
daniele	29:1a47b7151851	243	while (head && (seq_compare(SEQN(head) + head->payload_len, seq) <= 0)) {
daniele	29:1a47b7151851	244	struct pico_frame *cur = head;
daniele	29:1a47b7151851	245	head = next_segment(q, cur);
tass	37:bdf736327c71	246	tcp_dbg("Releasing %p\n", q);
daniele	29:1a47b7151851	247	pico_discard_segment(q, cur);
daniele	29:1a47b7151851	248	ret++;
daniele	29:1a47b7151851	249	}
daniele	29:1a47b7151851	250	return ret;
daniele	29:1a47b7151851	251	}
daniele	29:1a47b7151851	252
daniele	29:1a47b7151851	253	static int release_all_until(struct pico_tcp_queue *q, uint32_t seq)
daniele	29:1a47b7151851	254	{
daniele	29:1a47b7151851	255	struct pico_frame f = NULL, tmp __attribute__((unused));
daniele	29:1a47b7151851	256	struct pico_tree_node * idx, * temp;
daniele	29:1a47b7151851	257	int ret = 0;
daniele	29:1a47b7151851	258
daniele	29:1a47b7151851	259	pico_tree_foreach_safe(idx,&q->pool,temp){
daniele	29:1a47b7151851	260	f = idx->keyValue;
daniele	29:1a47b7151851	261	if (seq_compare(SEQN(f) + f->payload_len, seq) <= 0) {
tass	37:bdf736327c71	262	tcp_dbg("Releasing %p\n", f);
daniele	29:1a47b7151851	263	pico_discard_segment(q, f);
daniele	29:1a47b7151851	264	ret++;
daniele	29:1a47b7151851	265	} else
daniele	29:1a47b7151851	266	return ret;
daniele	29:1a47b7151851	267	}
daniele	29:1a47b7151851	268	return ret;
daniele	29:1a47b7151851	269	}
daniele	29:1a47b7151851	270
daniele	29:1a47b7151851	271	/* API calls */
daniele	29:1a47b7151851	272
daniele	29:1a47b7151851	273	uint16_t pico_tcp_checksum_ipv4(struct pico_frame *f)
daniele	29:1a47b7151851	274	{
daniele	29:1a47b7151851	275	struct pico_ipv4_hdr hdr = (struct pico_ipv4_hdr ) f->net_hdr;
daniele	29:1a47b7151851	276	struct pico_tcp_hdr tcp_hdr = (struct pico_tcp_hdr ) f->transport_hdr;
daniele	29:1a47b7151851	277	struct pico_socket *s = f->sock;
daniele	29:1a47b7151851	278	struct pico_ipv4_pseudo_hdr pseudo;
daniele	29:1a47b7151851	279
daniele	29:1a47b7151851	280	if (s) {
daniele	29:1a47b7151851	281	/* Case of outgoing frame */
daniele	29:1a47b7151851	282	//dbg("TCP CRC: on outgoing frame\n");
daniele	29:1a47b7151851	283	pseudo.src.addr = s->local_addr.ip4.addr;
daniele	29:1a47b7151851	284	pseudo.dst.addr = s->remote_addr.ip4.addr;
daniele	29:1a47b7151851	285	} else {
daniele	29:1a47b7151851	286	/* Case of incomming frame */
daniele	29:1a47b7151851	287	//dbg("TCP CRC: on incomming frame\n");
daniele	29:1a47b7151851	288	pseudo.src.addr = hdr->src.addr;
daniele	29:1a47b7151851	289	pseudo.dst.addr = hdr->dst.addr;
daniele	29:1a47b7151851	290	}
daniele	29:1a47b7151851	291	pseudo.zeros = 0;
daniele	29:1a47b7151851	292	pseudo.proto = PICO_PROTO_TCP;
daniele	29:1a47b7151851	293	pseudo.len = short_be(f->transport_len);
daniele	29:1a47b7151851	294
daniele	29:1a47b7151851	295	return pico_dualbuffer_checksum(&pseudo, sizeof(struct pico_ipv4_pseudo_hdr), tcp_hdr, f->transport_len);
daniele	29:1a47b7151851	296	}
daniele	29:1a47b7151851	297
tass	32:865c101e0874	298	static void tcp_send_fin(struct pico_socket_tcp *t);
daniele	29:1a47b7151851	299	static int pico_tcp_process_out(struct pico_protocol self, struct pico_frame f)
daniele	29:1a47b7151851	300	{
daniele	29:1a47b7151851	301	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	302	struct pico_socket_tcp t = (struct pico_socket_tcp )f->sock;
daniele	29:1a47b7151851	303	hdr = (struct pico_tcp_hdr *)f->transport_hdr;
daniele	29:1a47b7151851	304
daniele	29:1a47b7151851	305	if (f->payload_len > 0) {
daniele	29:1a47b7151851	306	tcp_dbg("Process out: sending %p (%d bytes)\n",f, f->payload_len);
daniele	29:1a47b7151851	307	} else {
daniele	29:1a47b7151851	308	tcp_dbg("Sending empty packet\n");
daniele	29:1a47b7151851	309	}
daniele	29:1a47b7151851	310
daniele	29:1a47b7151851	311	if (f->payload_len > 0) {
daniele	29:1a47b7151851	312	if (seq_compare(SEQN(f) + f->payload_len, t->snd_nxt) > 0) {
daniele	29:1a47b7151851	313	t->snd_nxt = SEQN(f) + f->payload_len;
daniele	29:1a47b7151851	314	tcp_dbg("%s: snd_nxt is now %08x\n", __FUNCTION__, t->snd_nxt);
daniele	29:1a47b7151851	315	}
daniele	29:1a47b7151851	316	} else if (hdr->flags == PICO_TCP_ACK) { /* pure ack */
daniele	29:1a47b7151851	317	hdr->seq = long_be(t->snd_nxt);
daniele	29:1a47b7151851	318	} else {
daniele	29:1a47b7151851	319	tcp_dbg("%s: non-pure ACK with len=0, fl:%04x\n", __FUNCTION__, hdr->flags);
daniele	29:1a47b7151851	320	}
tass	32:865c101e0874	321
daniele	29:1a47b7151851	322	pico_network_send(f);
daniele	29:1a47b7151851	323	return 0;
daniele	29:1a47b7151851	324	}
daniele	29:1a47b7151851	325
daniele	29:1a47b7151851	326	int pico_tcp_push(struct pico_protocol self, struct pico_frame data);
daniele	29:1a47b7151851	327
daniele	29:1a47b7151851	328	/* Interface: protocol definition */
daniele	29:1a47b7151851	329	struct pico_protocol pico_proto_tcp = {
daniele	29:1a47b7151851	330	.name = "tcp",
daniele	29:1a47b7151851	331	.proto_number = PICO_PROTO_TCP,
daniele	29:1a47b7151851	332	.layer = PICO_LAYER_TRANSPORT,
daniele	29:1a47b7151851	333	.process_in = pico_transport_process_in,
daniele	29:1a47b7151851	334	.process_out = pico_tcp_process_out,
daniele	29:1a47b7151851	335	.push = pico_tcp_push,
daniele	29:1a47b7151851	336	.q_in = &tcp_in,
daniele	29:1a47b7151851	337	.q_out = &tcp_out,
daniele	29:1a47b7151851	338	};
daniele	29:1a47b7151851	339
daniele	29:1a47b7151851	340	static uint32_t pico_paws(void)
daniele	29:1a47b7151851	341	{
daniele	29:1a47b7151851	342	static unsigned long _paws = 0;
daniele	29:1a47b7151851	343	_paws = pico_rand();
daniele	29:1a47b7151851	344	return long_be(_paws); /XXX: implement paws /
daniele	29:1a47b7151851	345	}
daniele	29:1a47b7151851	346
daniele	29:1a47b7151851	347	static void tcp_add_options(struct pico_socket_tcp ts, struct pico_frame f, uint16_t flags, int optsiz)
daniele	29:1a47b7151851	348	{
daniele	29:1a47b7151851	349	uint32_t tsval = long_be(pico_tick);
daniele	29:1a47b7151851	350	uint32_t tsecr = long_be(ts->ts_nxt);
daniele	29:1a47b7151851	351	int i = 0;
daniele	29:1a47b7151851	352	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	353
daniele	29:1a47b7151851	354	memset(f->start, PICO_TCP_OPTION_NOOP, optsiz); /* fill blanks with noop */
daniele	29:1a47b7151851	355
daniele	29:1a47b7151851	356	if (flags & PICO_TCP_SYN) {
daniele	29:1a47b7151851	357	f->start[i++] = PICO_TCP_OPTION_MSS;
daniele	29:1a47b7151851	358	f->start[i++] = PICO_TCPOPTLEN_MSS;
daniele	29:1a47b7151851	359	f->start[i++] = (ts->mss >> 8) & 0xFF;
daniele	29:1a47b7151851	360	f->start[i++] = ts->mss & 0xFF;
daniele	29:1a47b7151851	361	f->start[i++] = PICO_TCP_OPTION_SACK_OK;
daniele	29:1a47b7151851	362	f->start[i++] = PICO_TCPOPTLEN_SACK_OK;
daniele	29:1a47b7151851	363	}
daniele	29:1a47b7151851	364
daniele	29:1a47b7151851	365	f->start[i++] = PICO_TCP_OPTION_WS;
daniele	29:1a47b7151851	366	f->start[i++] = PICO_TCPOPTLEN_WS;
daniele	29:1a47b7151851	367	f->start[i++] = ts->wnd_scale;
daniele	29:1a47b7151851	368
daniele	29:1a47b7151851	369	if (optsiz >= 12) {
daniele	29:1a47b7151851	370	f->start[i++] = PICO_TCP_OPTION_TIMESTAMP;
daniele	29:1a47b7151851	371	f->start[i++] = PICO_TCPOPTLEN_TIMESTAMP;
daniele	29:1a47b7151851	372	memcpy(f->start + i, &tsval, 4);
daniele	29:1a47b7151851	373	i += 4;
daniele	29:1a47b7151851	374	memcpy(f->start + i, &tsecr, 4);
daniele	29:1a47b7151851	375	i += 4;
daniele	29:1a47b7151851	376	}
daniele	29:1a47b7151851	377
daniele	29:1a47b7151851	378	if (flags & PICO_TCP_ACK) {
daniele	29:1a47b7151851	379	struct tcp_sack_block *sb;
daniele	29:1a47b7151851	380	int len_off;
daniele	29:1a47b7151851	381
daniele	29:1a47b7151851	382	if (ts->sack_ok && ts->sacks) {
daniele	29:1a47b7151851	383	f->start[i++] = PICO_TCP_OPTION_SACK;
daniele	29:1a47b7151851	384	len_off = i;
daniele	29:1a47b7151851	385	f->start[i++] = PICO_TCPOPTLEN_SACK;
daniele	29:1a47b7151851	386	while(ts->sacks) {
daniele	29:1a47b7151851	387	sb = ts->sacks;
daniele	29:1a47b7151851	388	ts->sacks = sb->next;
daniele	29:1a47b7151851	389	memcpy(f->start + i, sb, 2 * sizeof(uint32_t));
daniele	29:1a47b7151851	390	i += (2 * sizeof(uint32_t));
daniele	29:1a47b7151851	391	f->start[len_off] += (2 * sizeof(uint32_t));
daniele	29:1a47b7151851	392	pico_free(sb);
daniele	29:1a47b7151851	393	}
daniele	29:1a47b7151851	394	}
daniele	29:1a47b7151851	395	}
daniele	29:1a47b7151851	396	if (i < optsiz)
daniele	29:1a47b7151851	397	f->start[ optsiz - 1 ] = PICO_TCP_OPTION_END;
daniele	29:1a47b7151851	398	}
daniele	29:1a47b7151851	399
daniele	29:1a47b7151851	400	static void tcp_send_ack(struct pico_socket_tcp *t);
daniele	29:1a47b7151851	401
daniele	29:1a47b7151851	402	static void tcp_set_space(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	403	{
daniele	29:1a47b7151851	404	int mtu, space;
daniele	29:1a47b7151851	405	int shift = 0;
daniele	29:1a47b7151851	406
daniele	29:1a47b7151851	407	mtu = t->mss + PICO_SIZE_TCPHDR + PICO_SIZE_TCPOPT_SYN ;
daniele	29:1a47b7151851	408	if (t->tcpq_in.max_size == 0) {
daniele	29:1a47b7151851	409	space = 1024 * 1024 * 1024; /* One Gigabyte, for unlimited sockets. */
daniele	29:1a47b7151851	410	} else {
daniele	29:1a47b7151851	411	space = ((t->tcpq_in.max_size - t->tcpq_in.size) / mtu) * t->mss;
daniele	29:1a47b7151851	412	}
daniele	29:1a47b7151851	413	if (space < 0)
daniele	29:1a47b7151851	414	space = 0;
daniele	29:1a47b7151851	415	while(space > 0xFFFF) {
daniele	29:1a47b7151851	416	space >>= 1;
daniele	29:1a47b7151851	417	shift++;
daniele	29:1a47b7151851	418	}
daniele	29:1a47b7151851	419	if ((space != t->wnd) \|\| (shift != t->wnd_scale) \|\| ((space - t->wnd) > (space>>2))) {
daniele	29:1a47b7151851	420	t->wnd = space;
daniele	29:1a47b7151851	421	t->wnd_scale = shift;
daniele	29:1a47b7151851	422	}
daniele	29:1a47b7151851	423	}
daniele	29:1a47b7151851	424
daniele	29:1a47b7151851	425	/* Return 32-bit aligned option size */
daniele	29:1a47b7151851	426	static int tcp_options_size(struct pico_socket_tcp *t, uint16_t flags)
daniele	29:1a47b7151851	427	{
daniele	29:1a47b7151851	428	int size = 0;
daniele	29:1a47b7151851	429	struct tcp_sack_block *sb = t->sacks;
daniele	29:1a47b7151851	430
daniele	29:1a47b7151851	431	if (flags & PICO_TCP_SYN) { /* Full options */
daniele	29:1a47b7151851	432	size = PICO_TCPOPTLEN_MSS + PICO_TCP_OPTION_SACK_OK + PICO_TCPOPTLEN_WS + PICO_TCPOPTLEN_TIMESTAMP;
daniele	29:1a47b7151851	433	} else {
daniele	29:1a47b7151851	434
daniele	29:1a47b7151851	435	/* Always update window scale. */
daniele	29:1a47b7151851	436	size += PICO_TCPOPTLEN_WS;
daniele	29:1a47b7151851	437
daniele	29:1a47b7151851	438	if (t->ts_ok)
daniele	29:1a47b7151851	439	size += PICO_TCPOPTLEN_TIMESTAMP;
daniele	29:1a47b7151851	440
daniele	29:1a47b7151851	441	size+= PICO_TCPOPTLEN_END;
daniele	29:1a47b7151851	442	}
daniele	29:1a47b7151851	443	if ((flags & PICO_TCP_ACK) && (t->sack_ok && sb)) {
daniele	29:1a47b7151851	444	size += 2;
daniele	29:1a47b7151851	445	while(sb) {
daniele	29:1a47b7151851	446	size += (2 * sizeof(uint32_t));
daniele	29:1a47b7151851	447	sb = sb->next;
daniele	29:1a47b7151851	448	}
daniele	29:1a47b7151851	449	}
daniele	29:1a47b7151851	450	size = (((size + 3) >> 2) << 2);
daniele	29:1a47b7151851	451	return size;
daniele	29:1a47b7151851	452	}
daniele	29:1a47b7151851	453
daniele	29:1a47b7151851	454	int pico_tcp_overhead(struct pico_socket *s)
daniele	29:1a47b7151851	455	{
daniele	29:1a47b7151851	456	if (!s)
daniele	29:1a47b7151851	457	return 0;
daniele	29:1a47b7151851	458
daniele	29:1a47b7151851	459	return PICO_SIZE_TCPHDR + tcp_options_size((struct pico_socket_tcp )s, 0); / hdr + Options size for data pkt */
daniele	29:1a47b7151851	460
daniele	29:1a47b7151851	461	}
daniele	29:1a47b7151851	462
daniele	29:1a47b7151851	463	static void tcp_process_sack(struct pico_socket_tcp *t, uint32_t start, uint32_t end)
daniele	29:1a47b7151851	464	{
daniele	29:1a47b7151851	465	struct pico_frame *f;
daniele	29:1a47b7151851	466	struct pico_tree_node * index, * temp;
daniele	29:1a47b7151851	467	int cmp;
daniele	29:1a47b7151851	468	int count = 0;
daniele	29:1a47b7151851	469
daniele	29:1a47b7151851	470	pico_tree_foreach_safe(index,&t->tcpq_out.pool,temp){
daniele	29:1a47b7151851	471	f = index->keyValue;
daniele	29:1a47b7151851	472	cmp = seq_compare(SEQN(f), start);
daniele	29:1a47b7151851	473	if (cmp > 0)
daniele	29:1a47b7151851	474	goto done;
daniele	29:1a47b7151851	475
daniele	29:1a47b7151851	476	if (cmp == 0) {
daniele	29:1a47b7151851	477	cmp = seq_compare(SEQN(f) + f->payload_len, end);
daniele	29:1a47b7151851	478	if (cmp > 0) {
daniele	29:1a47b7151851	479	tcp_dbg("Invalid SACK: ignoring.\n");
daniele	29:1a47b7151851	480	}
daniele	29:1a47b7151851	481
daniele	29:1a47b7151851	482	tcp_dbg("Marking (by SACK) segment %08x BLK:[%08x::%08x]\n", SEQN(f), start, end);
daniele	29:1a47b7151851	483	f->flags \|= PICO_FRAME_FLAG_SACKED;
daniele	29:1a47b7151851	484	count++;
daniele	29:1a47b7151851	485
daniele	29:1a47b7151851	486	if (cmp == 0) {
daniele	29:1a47b7151851	487	/* that was last segment sacked. Job done */
daniele	29:1a47b7151851	488	goto done;
daniele	29:1a47b7151851	489	}
daniele	29:1a47b7151851	490	}
daniele	29:1a47b7151851	491	}
daniele	29:1a47b7151851	492
daniele	29:1a47b7151851	493	done:
daniele	29:1a47b7151851	494	if (t->x_mode > PICO_TCP_LOOKAHEAD) {
daniele	29:1a47b7151851	495	if (t->in_flight > (count))
daniele	29:1a47b7151851	496	t->in_flight -= (count);
daniele	29:1a47b7151851	497	else
daniele	29:1a47b7151851	498	t->in_flight = 0;
daniele	29:1a47b7151851	499	}
daniele	29:1a47b7151851	500	}
daniele	29:1a47b7151851	501
daniele	29:1a47b7151851	502	static void tcp_rcv_sack(struct pico_socket_tcp t, uint8_t opt, int len)
daniele	29:1a47b7151851	503	{
daniele	29:1a47b7151851	504	uint32_t start, end;
daniele	29:1a47b7151851	505	int i = 0;
daniele	29:1a47b7151851	506	if (len % 8) {
daniele	29:1a47b7151851	507	tcp_dbg("SACK: Invalid len.\n");
daniele	29:1a47b7151851	508	return;
daniele	29:1a47b7151851	509	}
daniele	29:1a47b7151851	510	while (i < len) {
daniele	29:1a47b7151851	511	start = long_from(opt + i);
daniele	29:1a47b7151851	512	i += 4;
daniele	29:1a47b7151851	513	end = long_from(opt + i);
daniele	29:1a47b7151851	514	i += 4;
daniele	29:1a47b7151851	515	tcp_process_sack(t, long_be(start), long_be(end));
daniele	29:1a47b7151851	516	}
daniele	29:1a47b7151851	517	}
daniele	29:1a47b7151851	518
daniele	29:1a47b7151851	519	static void tcp_parse_options(struct pico_frame *f)
daniele	29:1a47b7151851	520	{
daniele	29:1a47b7151851	521	struct pico_socket_tcp t = (struct pico_socket_tcp )f->sock;
daniele	29:1a47b7151851	522	uint8_t *opt = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	523	int i = 0;
daniele	29:1a47b7151851	524	while (i < (f->transport_len - PICO_SIZE_TCPHDR)) {
daniele	29:1a47b7151851	525	uint8_t type = opt[i++];
daniele	29:1a47b7151851	526	uint8_t len;
daniele	29:1a47b7151851	527	if(i < (f->transport_len - PICO_SIZE_TCPHDR) && (type > 1))
daniele	29:1a47b7151851	528	len = opt[i++];
daniele	29:1a47b7151851	529	else
daniele	29:1a47b7151851	530	len = 1;
daniele	29:1a47b7151851	531	if (f->payload && ((opt + i) > f->payload))
daniele	29:1a47b7151851	532	break;
daniele	29:1a47b7151851	533	tcp_dbg("Received option '%d', len = %d \n", type, len);
daniele	29:1a47b7151851	534	switch (type) {
daniele	29:1a47b7151851	535	case PICO_TCP_OPTION_NOOP:
daniele	29:1a47b7151851	536	case PICO_TCP_OPTION_END:
daniele	29:1a47b7151851	537	break;
daniele	29:1a47b7151851	538	case PICO_TCP_OPTION_WS:
daniele	29:1a47b7151851	539	if (len != PICO_TCPOPTLEN_WS) {
daniele	29:1a47b7151851	540	tcp_dbg("TCP Window scale: bad len received (%d).\n", len);
daniele	29:1a47b7151851	541	i += len - 2;
daniele	29:1a47b7151851	542	break;
daniele	29:1a47b7151851	543	}
daniele	29:1a47b7151851	544	t->recv_wnd_scale = opt[i++];
daniele	29:1a47b7151851	545	tcp_dbg("TCP Window scale: received %d\n", t->recv_wnd_scale);
daniele	29:1a47b7151851	546	break;
daniele	29:1a47b7151851	547	case PICO_TCP_OPTION_SACK_OK:
daniele	29:1a47b7151851	548	if (len != PICO_TCPOPTLEN_SACK_OK) {
daniele	29:1a47b7151851	549	tcp_dbg("TCP option sack: bad len received.\n");
daniele	29:1a47b7151851	550	i += len - 2;
daniele	29:1a47b7151851	551	break;
daniele	29:1a47b7151851	552	}
daniele	29:1a47b7151851	553	t->sack_ok = 1;
daniele	29:1a47b7151851	554	break;
daniele	29:1a47b7151851	555	case PICO_TCP_OPTION_MSS: {
daniele	29:1a47b7151851	556	uint16_t mss;
daniele	29:1a47b7151851	557	if (len != PICO_TCPOPTLEN_MSS) {
daniele	29:1a47b7151851	558	tcp_dbg("TCP option mss: bad len received.\n");
daniele	29:1a47b7151851	559	i += len - 2;
daniele	29:1a47b7151851	560	break;
daniele	29:1a47b7151851	561	}
daniele	29:1a47b7151851	562	t->mss_ok = 1;
daniele	29:1a47b7151851	563	mss = short_from(opt + i);
daniele	29:1a47b7151851	564	i += sizeof(uint16_t);
daniele	29:1a47b7151851	565	if (t->mss > short_be(mss))
daniele	29:1a47b7151851	566	t->mss = short_be(mss);
daniele	29:1a47b7151851	567	break;
daniele	29:1a47b7151851	568	}
daniele	29:1a47b7151851	569	case PICO_TCP_OPTION_TIMESTAMP: {
daniele	29:1a47b7151851	570	uint32_t tsval, tsecr;
daniele	29:1a47b7151851	571	if (len != PICO_TCPOPTLEN_TIMESTAMP) {
daniele	29:1a47b7151851	572	tcp_dbg("TCP option timestamp: bad len received.\n");
daniele	29:1a47b7151851	573	i += len - 2;
daniele	29:1a47b7151851	574	break;
daniele	29:1a47b7151851	575	}
daniele	29:1a47b7151851	576	t->ts_ok = 1;
daniele	29:1a47b7151851	577	tsval = long_from(opt + i);
daniele	29:1a47b7151851	578	i += sizeof(uint32_t);
daniele	29:1a47b7151851	579	tsecr = long_from(opt + i);
daniele	29:1a47b7151851	580	f->timestamp = long_be(tsecr);
daniele	29:1a47b7151851	581	i += sizeof(uint32_t);
daniele	29:1a47b7151851	582
daniele	29:1a47b7151851	583	t->ts_nxt = long_be(tsval);
daniele	29:1a47b7151851	584	break;
daniele	29:1a47b7151851	585	}
daniele	29:1a47b7151851	586	case PICO_TCP_OPTION_SACK:
daniele	29:1a47b7151851	587	{
daniele	29:1a47b7151851	588	tcp_rcv_sack(t, opt + i, len - 2);
daniele	29:1a47b7151851	589	i += len - 2;
daniele	29:1a47b7151851	590	break;
daniele	29:1a47b7151851	591	}
daniele	29:1a47b7151851	592	default:
daniele	29:1a47b7151851	593	tcp_dbg("TCP: received unsupported option %u\n", type);
daniele	29:1a47b7151851	594	i += len - 2;
daniele	29:1a47b7151851	595	}
daniele	29:1a47b7151851	596	}
daniele	29:1a47b7151851	597	}
daniele	29:1a47b7151851	598
daniele	29:1a47b7151851	599	static int tcp_send(struct pico_socket_tcp ts, struct pico_frame f)
daniele	29:1a47b7151851	600	{
daniele	29:1a47b7151851	601	struct pico_tcp_hdr hdr= (struct pico_tcp_hdr ) f->transport_hdr;
daniele	29:1a47b7151851	602	struct pico_frame *cpy;
daniele	29:1a47b7151851	603	hdr->trans.sport = ts->sock.local_port;
daniele	29:1a47b7151851	604	hdr->trans.dport = ts->sock.remote_port;
daniele	29:1a47b7151851	605	if (!hdr->seq)
daniele	29:1a47b7151851	606	hdr->seq = long_be(ts->snd_nxt);
daniele	29:1a47b7151851	607
daniele	29:1a47b7151851	608	if (ts->rcv_nxt != 0) {
daniele	29:1a47b7151851	609	if ( (ts->rcv_ackd == 0) \|\| (seq_compare(ts->rcv_ackd, ts->rcv_nxt) != 0) \|\| (hdr->flags & PICO_TCP_ACK)) {
daniele	29:1a47b7151851	610	hdr->flags \|= PICO_TCP_ACK;
daniele	29:1a47b7151851	611	hdr->ack = long_be(ts->rcv_nxt);
daniele	29:1a47b7151851	612	ts->rcv_ackd = ts->rcv_nxt;
daniele	29:1a47b7151851	613	}
daniele	29:1a47b7151851	614	}
daniele	29:1a47b7151851	615
daniele	29:1a47b7151851	616	if (hdr->flags & PICO_TCP_SYN) {
daniele	29:1a47b7151851	617	ts->snd_nxt++;
daniele	29:1a47b7151851	618	}
daniele	29:1a47b7151851	619	if (f->payload_len > 0) {
daniele	29:1a47b7151851	620	hdr->flags \|= PICO_TCP_PSH \| PICO_TCP_ACK;
daniele	29:1a47b7151851	621	hdr->ack = long_be(ts->rcv_nxt);
daniele	29:1a47b7151851	622	ts->rcv_ackd = ts->rcv_nxt;
daniele	29:1a47b7151851	623	}
daniele	29:1a47b7151851	624
daniele	29:1a47b7151851	625	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	626	hdr->rwnd = short_be(ts->wnd);
daniele	29:1a47b7151851	627	hdr->crc = 0;
daniele	29:1a47b7151851	628	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	629
daniele	29:1a47b7151851	630	/* TCP: ENQUEUE to PROTO ( Transmit ) */
daniele	29:1a47b7151851	631	cpy = pico_frame_copy(f);
daniele	29:1a47b7151851	632	if (pico_enqueue(&tcp_out, cpy) > 0) {
daniele	29:1a47b7151851	633	if (f->payload_len > 0)
daniele	29:1a47b7151851	634	ts->in_flight++;
daniele	29:1a47b7151851	635	tcp_dbg("DBG> [tcp output] state: %02x --> local port:%d remote port: %d seq: %08x ack: %08x flags: %02x = t_len: %d, hdr: %u payload: %d\n",
daniele	29:1a47b7151851	636	TCPSTATE(&ts->sock) >> 8, short_be(hdr->trans.sport), short_be(hdr->trans.dport), SEQN(f), ACKN(f), hdr->flags, f->transport_len, (hdr->len & 0xf0) >> 2 , f->payload_len );
daniele	29:1a47b7151851	637	} else {
daniele	29:1a47b7151851	638	pico_frame_discard(cpy);
daniele	29:1a47b7151851	639	}
daniele	29:1a47b7151851	640	return 0;
daniele	29:1a47b7151851	641	}
daniele	29:1a47b7151851	642
daniele	29:1a47b7151851	643	//#define PICO_TCP_SUPPORT_SOCKET_STATS
daniele	29:1a47b7151851	644
daniele	29:1a47b7151851	645	#ifdef PICO_TCP_SUPPORT_SOCKET_STATS
daniele	29:1a47b7151851	646	static void sock_stats(unsigned long when, void *arg)
daniele	29:1a47b7151851	647	{
daniele	29:1a47b7151851	648	struct pico_socket_tcp t = (struct pico_socket_tcp )arg;
daniele	29:1a47b7151851	649	tcp_dbg("STATISTIC> [%lu] socket state: %02x --> local port:%d remote port: %d queue size: %d snd_una: %08x snd_nxt: %08x timer: %d cwnd: %d\n",
daniele	29:1a47b7151851	650	when, t->sock.state, short_be(t->sock.local_port), short_be(t->sock.remote_port), t->tcpq_out.size, SEQN(first_segment(&t->tcpq_out)), t->snd_nxt, t->timer_running, t->cwnd);
daniele	29:1a47b7151851	651	pico_timer_add(2000, sock_stats, t);
daniele	29:1a47b7151851	652	}
daniele	29:1a47b7151851	653	#endif
daniele	29:1a47b7151851	654
daniele	29:1a47b7151851	655	struct pico_socket *pico_tcp_open(void)
daniele	29:1a47b7151851	656	{
daniele	29:1a47b7151851	657	struct pico_socket_tcp *t = pico_zalloc(sizeof(struct pico_socket_tcp));
daniele	29:1a47b7151851	658	if (!t)
daniele	29:1a47b7151851	659	return NULL;
daniele	29:1a47b7151851	660	t->mss = PICO_TCP_DEFAULT_MSS;
daniele	29:1a47b7151851	661
daniele	29:1a47b7151851	662	t->tcpq_in.pool.root = t->tcpq_hold.pool.root = t->tcpq_out.pool.root = &LEAF;
daniele	29:1a47b7151851	663	t->tcpq_hold.pool.compare = t->tcpq_in.pool.compare = t->tcpq_out.pool.compare = segment_compare;
daniele	29:1a47b7151851	664
daniele	29:1a47b7151851	665	t->tcpq_in.max_size = PICO_DEFAULT_SOCKETQ;
daniele	29:1a47b7151851	666	t->tcpq_out.max_size = PICO_DEFAULT_SOCKETQ;
daniele	29:1a47b7151851	667	t->tcpq_hold.max_size = 2*PICO_TCP_DEFAULT_MSS;
daniele	29:1a47b7151851	668
daniele	29:1a47b7151851	669	/* enable Nagle by default */
daniele	29:1a47b7151851	670	t->sock.opt_flags &= (~(1 << PICO_SOCKET_OPT_TCPNODELAY));
daniele	29:1a47b7151851	671
daniele	29:1a47b7151851	672	#ifdef PICO_TCP_SUPPORT_SOCKET_STATS
daniele	29:1a47b7151851	673	pico_timer_add(2000, sock_stats, t);
daniele	29:1a47b7151851	674	#endif
daniele	29:1a47b7151851	675	tcp_set_space(t);
daniele	29:1a47b7151851	676
daniele	29:1a47b7151851	677	return &t->sock;
daniele	29:1a47b7151851	678	}
daniele	29:1a47b7151851	679
daniele	29:1a47b7151851	680	int pico_tcp_read(struct pico_socket s, void buf, int len)
daniele	29:1a47b7151851	681	{
daniele	29:1a47b7151851	682	struct pico_socket_tcp *t = TCP_SOCK(s);
daniele	29:1a47b7151851	683	struct pico_frame *f;
daniele	29:1a47b7151851	684	uint32_t in_frame_off, in_frame_len;
daniele	29:1a47b7151851	685	int tot_rd_len = 0;
daniele	29:1a47b7151851	686
daniele	29:1a47b7151851	687	while (tot_rd_len < len) {
daniele	29:1a47b7151851	688	/* To be sure we don't have garbage at the beginning */
daniele	29:1a47b7151851	689	release_until(&t->tcpq_in, t->rcv_processed);
daniele	29:1a47b7151851	690	f = first_segment(&t->tcpq_in);
daniele	29:1a47b7151851	691	if (!f) {
daniele	29:1a47b7151851	692	tcp_set_space(t);
daniele	29:1a47b7151851	693	goto out;
daniele	29:1a47b7151851	694	}
daniele	29:1a47b7151851	695
daniele	29:1a47b7151851	696	/* Hole at the beginning of data, awaiting retransmissions. */
daniele	29:1a47b7151851	697	if (seq_compare(t->rcv_processed, SEQN(f)) < 0) {
daniele	29:1a47b7151851	698	tcp_dbg("TCP> read hole beginning of data, %08x - %08x. rcv_nxt is %08x\n",t->rcv_processed, SEQN(f), t->rcv_nxt);
daniele	29:1a47b7151851	699	goto out;
daniele	29:1a47b7151851	700	}
daniele	29:1a47b7151851	701
daniele	29:1a47b7151851	702	if(seq_compare(t->rcv_processed, SEQN(f)) > 0) {
daniele	29:1a47b7151851	703	in_frame_off = t->rcv_processed - SEQN(f);
daniele	29:1a47b7151851	704	in_frame_len = f->payload_len - in_frame_off;
daniele	29:1a47b7151851	705	} else {
daniele	29:1a47b7151851	706	in_frame_off = 0;
daniele	29:1a47b7151851	707	in_frame_len = f->payload_len;
daniele	29:1a47b7151851	708	}
daniele	29:1a47b7151851	709	if ((in_frame_len + tot_rd_len) > len) {
daniele	29:1a47b7151851	710	in_frame_len = len - tot_rd_len;
daniele	29:1a47b7151851	711	}
daniele	29:1a47b7151851	712
daniele	29:1a47b7151851	713	if (in_frame_len > f->payload_len - in_frame_off)
daniele	29:1a47b7151851	714	in_frame_len = f->payload_len - in_frame_off;
daniele	29:1a47b7151851	715
daniele	29:1a47b7151851	716	memcpy((uint8_t *)buf + tot_rd_len, f->payload + in_frame_off, in_frame_len);
daniele	29:1a47b7151851	717	tot_rd_len += in_frame_len;
daniele	29:1a47b7151851	718	t->rcv_processed += in_frame_len;
daniele	29:1a47b7151851	719
daniele	29:1a47b7151851	720	if ((in_frame_len == 0) \|\| (in_frame_len == f->payload_len)) {
daniele	29:1a47b7151851	721	pico_discard_segment(&t->tcpq_in, f);
daniele	29:1a47b7151851	722	}
daniele	29:1a47b7151851	723	}
daniele	29:1a47b7151851	724
daniele	29:1a47b7151851	725	out:
daniele	29:1a47b7151851	726	tcp_set_space(t);
daniele	29:1a47b7151851	727	if (t->tcpq_in.size == 0) {
daniele	29:1a47b7151851	728	s->ev_pending &= (~PICO_SOCK_EV_RD);
daniele	29:1a47b7151851	729	}
daniele	29:1a47b7151851	730	return tot_rd_len;
daniele	29:1a47b7151851	731	}
daniele	29:1a47b7151851	732
daniele	29:1a47b7151851	733	int pico_tcp_initconn(struct pico_socket *s);
daniele	29:1a47b7151851	734	static void initconn_retry(unsigned long when, void *arg)
daniele	29:1a47b7151851	735	{
daniele	29:1a47b7151851	736	struct pico_socket_tcp t = (struct pico_socket_tcp )arg;
daniele	29:1a47b7151851	737	if (TCPSTATE(&t->sock) == PICO_SOCKET_STATE_TCP_SYN_SENT) {
daniele	29:1a47b7151851	738	if (t->backoff > PICO_TCP_MAX_CONNECT_RETRIES) {
daniele	29:1a47b7151851	739	tcp_dbg("TCP> Connection timeout. \n");
daniele	29:1a47b7151851	740	if (t->sock.wakeup)
daniele	29:1a47b7151851	741	t->sock.wakeup(PICO_SOCK_EV_ERR, &t->sock);
daniele	29:1a47b7151851	742	return;
daniele	29:1a47b7151851	743	}
daniele	29:1a47b7151851	744	tcp_dbg("TCP> SYN retry %d...\n", t->backoff);
daniele	29:1a47b7151851	745	t->backoff++;
daniele	29:1a47b7151851	746	pico_tcp_initconn(&t->sock);
daniele	29:1a47b7151851	747	} else {
daniele	29:1a47b7151851	748	tcp_dbg("TCP> Connection is already established: no retry needed. good.\n");
daniele	29:1a47b7151851	749	}
daniele	29:1a47b7151851	750	}
daniele	29:1a47b7151851	751
daniele	29:1a47b7151851	752	int pico_tcp_initconn(struct pico_socket *s)
daniele	29:1a47b7151851	753	{
daniele	29:1a47b7151851	754	struct pico_socket_tcp *ts = TCP_SOCK(s);
daniele	29:1a47b7151851	755	struct pico_frame *syn;
daniele	29:1a47b7151851	756	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	757	int opt_len = tcp_options_size(ts, PICO_TCP_SYN);
daniele	29:1a47b7151851	758
daniele	29:1a47b7151851	759	syn = s->net->alloc(s->net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	760	if (!syn)
daniele	29:1a47b7151851	761	return -1;
daniele	29:1a47b7151851	762	hdr = (struct pico_tcp_hdr *) syn->transport_hdr;
daniele	29:1a47b7151851	763
daniele	29:1a47b7151851	764	if (!ts->snd_nxt)
daniele	29:1a47b7151851	765	ts->snd_nxt = long_be(pico_paws());
daniele	29:1a47b7151851	766	ts->snd_last = ts->snd_nxt;
daniele	29:1a47b7151851	767	ts->cwnd = PICO_TCP_IW;
daniele	29:1a47b7151851	768	ts->ssthresh = 40;
daniele	29:1a47b7151851	769	syn->sock = s;
daniele	29:1a47b7151851	770	hdr->seq = long_be(ts->snd_nxt);
daniele	29:1a47b7151851	771	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| ts->jumbo;
daniele	29:1a47b7151851	772	hdr->flags = PICO_TCP_SYN;
daniele	29:1a47b7151851	773	tcp_set_space(ts);
daniele	29:1a47b7151851	774	hdr->rwnd = short_be(ts->wnd);
daniele	29:1a47b7151851	775	tcp_add_options(ts,syn, PICO_TCP_SYN, opt_len);
daniele	29:1a47b7151851	776	hdr->trans.sport = ts->sock.local_port;
daniele	29:1a47b7151851	777	hdr->trans.dport = ts->sock.remote_port;
daniele	29:1a47b7151851	778
daniele	29:1a47b7151851	779	hdr->crc = 0;
daniele	29:1a47b7151851	780	hdr->crc = short_be(pico_tcp_checksum_ipv4(syn));
daniele	29:1a47b7151851	781
daniele	29:1a47b7151851	782	/* TCP: ENQUEUE to PROTO ( SYN ) */
daniele	29:1a47b7151851	783	tcp_dbg("Sending SYN... (ports: %d - %d) size: %d\n", short_be(ts->sock.local_port), short_be(ts->sock.remote_port), syn->buffer_len);
daniele	29:1a47b7151851	784	pico_enqueue(&tcp_out, syn);
tass	37:bdf736327c71	785	pico_timer_add(PICO_TCP_SYN_TO << ts->backoff, initconn_retry, ts);
daniele	29:1a47b7151851	786	return 0;
daniele	29:1a47b7151851	787	}
daniele	29:1a47b7151851	788
daniele	29:1a47b7151851	789	static int tcp_send_synack(struct pico_socket *s)
daniele	29:1a47b7151851	790	{
daniele	29:1a47b7151851	791	struct pico_socket_tcp *ts = TCP_SOCK(s);
daniele	29:1a47b7151851	792	struct pico_frame *synack;
daniele	29:1a47b7151851	793	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	794	int opt_len = tcp_options_size(ts, PICO_TCP_SYN \| PICO_TCP_ACK);
daniele	29:1a47b7151851	795
daniele	29:1a47b7151851	796	synack = s->net->alloc(s->net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	797	if (!synack)
daniele	29:1a47b7151851	798	return -1;
daniele	29:1a47b7151851	799	hdr = (struct pico_tcp_hdr *) synack->transport_hdr;
daniele	29:1a47b7151851	800
daniele	29:1a47b7151851	801	synack->sock = s;
daniele	29:1a47b7151851	802	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| ts->jumbo;
daniele	29:1a47b7151851	803	hdr->flags = PICO_TCP_SYN \| PICO_TCP_ACK;
daniele	29:1a47b7151851	804	hdr->rwnd = short_be(ts->wnd);
daniele	29:1a47b7151851	805	hdr->seq = long_be(ts->snd_nxt);
daniele	29:1a47b7151851	806	ts->rcv_processed = long_be(hdr->seq);
daniele	29:1a47b7151851	807	ts->snd_last = ts->snd_nxt;
daniele	29:1a47b7151851	808	tcp_set_space(ts);
daniele	29:1a47b7151851	809	tcp_add_options(ts,synack, hdr->flags, opt_len);
daniele	29:1a47b7151851	810	synack->payload_len = 0;
daniele	29:1a47b7151851	811	synack->timestamp = pico_tick;
daniele	29:1a47b7151851	812	tcp_send(ts, synack);
daniele	29:1a47b7151851	813	pico_frame_discard(synack);
daniele	29:1a47b7151851	814	return 0;
daniele	29:1a47b7151851	815	}
daniele	29:1a47b7151851	816
daniele	29:1a47b7151851	817	static void tcp_send_empty(struct pico_socket_tcp *t, uint16_t flags)
daniele	29:1a47b7151851	818	{
daniele	29:1a47b7151851	819	struct pico_frame *f;
daniele	29:1a47b7151851	820	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	821	int opt_len = tcp_options_size(t, flags);
daniele	29:1a47b7151851	822	f = t->sock.net->alloc(t->sock.net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	823	if (!f) {
daniele	29:1a47b7151851	824	return;
daniele	29:1a47b7151851	825	}
daniele	29:1a47b7151851	826	f->sock = &t->sock;
daniele	29:1a47b7151851	827	hdr = (struct pico_tcp_hdr *) f->transport_hdr;
daniele	29:1a47b7151851	828	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| t->jumbo;
daniele	29:1a47b7151851	829	hdr->flags = flags;
daniele	29:1a47b7151851	830	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	831	tcp_set_space(t);
daniele	29:1a47b7151851	832	tcp_add_options(t,f, flags, opt_len);
daniele	29:1a47b7151851	833	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	834	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	835	hdr->seq = long_be(t->snd_nxt);
daniele	29:1a47b7151851	836	if ((flags & PICO_TCP_ACK) != 0)
daniele	29:1a47b7151851	837	hdr->ack = long_be(t->rcv_nxt);
daniele	29:1a47b7151851	838	t->rcv_ackd = t->rcv_nxt;
daniele	29:1a47b7151851	839
daniele	29:1a47b7151851	840	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	841	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	842	hdr->crc = 0;
daniele	29:1a47b7151851	843	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	844
daniele	29:1a47b7151851	845	/* TCP: ENQUEUE to PROTO */
daniele	29:1a47b7151851	846	pico_enqueue(&tcp_out, f);
daniele	29:1a47b7151851	847	}
daniele	29:1a47b7151851	848
daniele	29:1a47b7151851	849	static void tcp_send_ack(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	850	{
daniele	29:1a47b7151851	851	return tcp_send_empty(t, PICO_TCP_ACK);
daniele	29:1a47b7151851	852	}
daniele	29:1a47b7151851	853
daniele	29:1a47b7151851	854	static int tcp_send_rst(struct pico_socket s, struct pico_frame fr)
daniele	29:1a47b7151851	855	{
daniele	29:1a47b7151851	856	struct pico_socket_tcp t = (struct pico_socket_tcp ) s;
daniele	29:1a47b7151851	857	struct pico_frame *f;
daniele	29:1a47b7151851	858	struct pico_tcp_hdr hdr, hdr_rcv;
daniele	29:1a47b7151851	859	int opt_len = tcp_options_size(t, PICO_TCP_RST);
daniele	29:1a47b7151851	860	int close;
daniele	29:1a47b7151851	861
daniele	29:1a47b7151851	862	tcp_dbg("TCP SEND_RST >>>>>>>>>>>>>>> START\n");
daniele	29:1a47b7151851	863
daniele	29:1a47b7151851	864	f = t->sock.net->alloc(t->sock.net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	865
daniele	29:1a47b7151851	866	if (!f) {
daniele	29:1a47b7151851	867	return -1;
daniele	29:1a47b7151851	868	}
daniele	29:1a47b7151851	869
daniele	29:1a47b7151851	870	hdr_rcv = (struct pico_tcp_hdr *) fr->transport_hdr;
daniele	29:1a47b7151851	871
daniele	29:1a47b7151851	872	f->sock = &t->sock;
daniele	29:1a47b7151851	873	hdr = (struct pico_tcp_hdr *) f->transport_hdr;
daniele	29:1a47b7151851	874	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| t->jumbo;
daniele	29:1a47b7151851	875	hdr->flags = PICO_TCP_RST;
daniele	29:1a47b7151851	876	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	877	tcp_set_space(t);
daniele	29:1a47b7151851	878	tcp_add_options(t,f, PICO_TCP_RST, opt_len);
daniele	29:1a47b7151851	879	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	880	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	881	hdr->seq = long_be(t->snd_nxt);
daniele	29:1a47b7151851	882
daniele	29:1a47b7151851	883	/* check if state is synchronized */
daniele	29:1a47b7151851	884	if (((s->state & PICO_SOCKET_STATE_TCP) > PICO_SOCKET_STATE_TCP_SYN_RECV)) {
daniele	29:1a47b7151851	885	/* in synchronized state: send RST with seq = ack from previous segment */
daniele	29:1a47b7151851	886	hdr->seq = hdr_rcv->ack;
daniele	29:1a47b7151851	887	close = 0;
daniele	29:1a47b7151851	888	} else {
daniele	29:1a47b7151851	889	/* non-synchronized state */
daniele	29:1a47b7151851	890	/* go to CLOSED here to prevent timer callback to go on after timeout */
daniele	29:1a47b7151851	891	(t->sock).state &= 0x00FFU;
daniele	29:1a47b7151851	892	(t->sock).state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	893	close = 1;
daniele	29:1a47b7151851	894	}
daniele	29:1a47b7151851	895
daniele	29:1a47b7151851	896	hdr->ack = long_be(t->rcv_nxt);
daniele	29:1a47b7151851	897	t->rcv_ackd = t->rcv_nxt;
daniele	29:1a47b7151851	898	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	899	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	900	hdr->crc = 0;
daniele	29:1a47b7151851	901	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	902
daniele	29:1a47b7151851	903	/* TCP: ENQUEUE to PROTO */
daniele	29:1a47b7151851	904	pico_enqueue(&tcp_out, f);
daniele	29:1a47b7151851	905
daniele	29:1a47b7151851	906	/* goto CLOSED */
daniele	29:1a47b7151851	907	if (close) {
daniele	29:1a47b7151851	908	(t->sock).state &= 0xFF00U;
daniele	29:1a47b7151851	909	(t->sock).state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	910
daniele	29:1a47b7151851	911	/* call EV_FIN wakeup before deleting */
daniele	29:1a47b7151851	912	if ((t->sock).wakeup)
daniele	29:1a47b7151851	913	(t->sock).wakeup(PICO_SOCK_EV_FIN, &(t->sock));
daniele	29:1a47b7151851	914
daniele	29:1a47b7151851	915	/* delete socket */
daniele	29:1a47b7151851	916	pico_socket_del(&t->sock);
daniele	29:1a47b7151851	917
daniele	29:1a47b7151851	918	tcp_dbg("TCP SEND_RST >>>>>>>>>>>>>>> DONE, deleted socket\n");
daniele	29:1a47b7151851	919	}
daniele	29:1a47b7151851	920
daniele	29:1a47b7151851	921	return 0;
daniele	29:1a47b7151851	922	}
daniele	29:1a47b7151851	923
daniele	29:1a47b7151851	924	int pico_tcp_reply_rst(struct pico_frame *fr)
daniele	29:1a47b7151851	925	{
daniele	29:1a47b7151851	926	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	927	struct pico_frame *f;
daniele	29:1a47b7151851	928	int size = PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	929
daniele	29:1a47b7151851	930	tcp_dbg("TCP>>>>>>>>>>>>>>>> sending RST ... <<<<<<<<<<<<<<<<<<\n");
daniele	29:1a47b7151851	931
daniele	29:1a47b7151851	932	f = fr->sock->net->alloc(fr->sock->net, size);
daniele	29:1a47b7151851	933
daniele	29:1a47b7151851	934	/* fill in IP data from original frame */
daniele	29:1a47b7151851	935	// TODO if IPv4
daniele	29:1a47b7151851	936	((struct pico_ipv4_hdr )(f->net_hdr))->dst.addr = ((struct pico_ipv4_hdr )(fr->net_hdr))->src.addr;
daniele	29:1a47b7151851	937	((struct pico_ipv4_hdr )(f->net_hdr))->src.addr = ((struct pico_ipv4_hdr )(fr->net_hdr))->dst.addr;
daniele	29:1a47b7151851	938
daniele	29:1a47b7151851	939	/* fill in TCP data from original frame */
daniele	29:1a47b7151851	940	((struct pico_tcp_hdr )(f->transport_hdr))->trans.dport = ((struct pico_tcp_hdr )(fr->transport_hdr))->trans.sport;
daniele	29:1a47b7151851	941	((struct pico_tcp_hdr )(f->transport_hdr))->trans.sport = ((struct pico_tcp_hdr )(fr->transport_hdr))->trans.dport;
daniele	29:1a47b7151851	942	hdr = (struct pico_tcp_hdr *) f->transport_hdr;
daniele	29:1a47b7151851	943	hdr->len = size << 2;
daniele	29:1a47b7151851	944	hdr->flags = PICO_TCP_RST \| PICO_TCP_ACK;
daniele	29:1a47b7151851	945	hdr->rwnd = 0;
daniele	29:1a47b7151851	946	if (((struct pico_tcp_hdr *)(fr->transport_hdr))->flags & PICO_TCP_ACK) {
daniele	29:1a47b7151851	947	hdr->seq = ((struct pico_tcp_hdr *)(fr->transport_hdr))->ack;
daniele	29:1a47b7151851	948	} else {
daniele	29:1a47b7151851	949	hdr->seq = 0U;
daniele	29:1a47b7151851	950	}
daniele	29:1a47b7151851	951
daniele	29:1a47b7151851	952	hdr->ack = ((struct pico_tcp_hdr *)(fr->transport_hdr))->seq + short_be(fr->payload_len);
daniele	29:1a47b7151851	953
daniele	29:1a47b7151851	954	/* enqueue for transmission */
daniele	29:1a47b7151851	955	pico_ipv4_frame_push(f,&(((struct pico_ipv4_hdr *)(f->net_hdr))->dst),PICO_PROTO_TCP);
daniele	29:1a47b7151851	956
daniele	29:1a47b7151851	957	return 0;
daniele	29:1a47b7151851	958	}
daniele	29:1a47b7151851	959
daniele	29:1a47b7151851	960	static int tcp_nosync_rst(struct pico_socket s, struct pico_frame fr)
daniele	29:1a47b7151851	961	{
daniele	29:1a47b7151851	962	struct pico_socket_tcp t = (struct pico_socket_tcp ) s;
daniele	29:1a47b7151851	963	struct pico_frame *f;
daniele	29:1a47b7151851	964	struct pico_tcp_hdr hdr, hdr_rcv;
daniele	29:1a47b7151851	965	int opt_len = tcp_options_size(t, PICO_TCP_RST \| PICO_TCP_ACK);
daniele	29:1a47b7151851	966
daniele	29:1a47b7151851	967	tcp_dbg("TCP SEND RST (NON-SYNC) >>>>>>>>>>>>>>>>>> state %x\n",(s->state & PICO_SOCKET_STATE_TCP));
daniele	29:1a47b7151851	968	if (((s->state & PICO_SOCKET_STATE_TCP) == PICO_SOCKET_STATE_TCP_LISTEN)) {
daniele	29:1a47b7151851	969	/* XXX TODO NOTE: to prevent the parent socket from trying to send, because this socket has no knowledge of dst IP !!! */
daniele	29:1a47b7151851	970	return pico_tcp_reply_rst(fr);
daniele	29:1a47b7151851	971	}
daniele	29:1a47b7151851	972
daniele	29:1a47b7151851	973	/***************************************************************************/
daniele	29:1a47b7151851	974	/* sending RST */
daniele	29:1a47b7151851	975	f = t->sock.net->alloc(t->sock.net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	976
daniele	29:1a47b7151851	977	if (!f) {
daniele	29:1a47b7151851	978	return -1;
daniele	29:1a47b7151851	979	}
daniele	29:1a47b7151851	980
daniele	29:1a47b7151851	981	hdr_rcv = (struct pico_tcp_hdr *) fr->transport_hdr;
daniele	29:1a47b7151851	982
daniele	29:1a47b7151851	983	f->sock = &t->sock;
daniele	29:1a47b7151851	984	hdr = (struct pico_tcp_hdr *) f->transport_hdr;
daniele	29:1a47b7151851	985	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| t->jumbo;
daniele	29:1a47b7151851	986	hdr->flags = PICO_TCP_RST \| PICO_TCP_ACK;
daniele	29:1a47b7151851	987	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	988	tcp_set_space(t);
daniele	29:1a47b7151851	989	tcp_add_options(t,f, PICO_TCP_RST \| PICO_TCP_ACK, opt_len);
daniele	29:1a47b7151851	990	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	991	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	992
daniele	29:1a47b7151851	993	/* non-synchronized state */
daniele	29:1a47b7151851	994	if (hdr_rcv->flags & PICO_TCP_ACK) {
daniele	29:1a47b7151851	995	hdr->seq = hdr_rcv->ack;
daniele	29:1a47b7151851	996	} else {
daniele	29:1a47b7151851	997	hdr->seq = 0U;
daniele	29:1a47b7151851	998	}
daniele	29:1a47b7151851	999
daniele	29:1a47b7151851	1000	hdr->ack = hdr_rcv->seq + short_be(fr->payload_len);
daniele	29:1a47b7151851	1001
daniele	29:1a47b7151851	1002	t->rcv_ackd = t->rcv_nxt;
daniele	29:1a47b7151851	1003	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	1004	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	1005	hdr->crc = 0;
daniele	29:1a47b7151851	1006	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	1007
daniele	29:1a47b7151851	1008	/* TCP: ENQUEUE to PROTO */
daniele	29:1a47b7151851	1009	pico_enqueue(&tcp_out, f);
daniele	29:1a47b7151851	1010
daniele	29:1a47b7151851	1011	/***************************************************************************/
daniele	29:1a47b7151851	1012
daniele	29:1a47b7151851	1013	tcp_dbg("TCP SEND_RST (NON_SYNC) >>>>>>>>>>>>>>> DONE, ...\n");
daniele	29:1a47b7151851	1014
daniele	29:1a47b7151851	1015	return 0;
daniele	29:1a47b7151851	1016	}
daniele	29:1a47b7151851	1017
daniele	29:1a47b7151851	1018	static void tcp_send_fin(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	1019	{
daniele	29:1a47b7151851	1020	struct pico_frame *f;
daniele	29:1a47b7151851	1021	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	1022	int opt_len = tcp_options_size(t, PICO_TCP_FIN);
daniele	29:1a47b7151851	1023	f = t->sock.net->alloc(t->sock.net, PICO_SIZE_TCPHDR + opt_len);
daniele	29:1a47b7151851	1024	if (!f) {
daniele	29:1a47b7151851	1025	return;
daniele	29:1a47b7151851	1026	}
daniele	29:1a47b7151851	1027	f->sock = &t->sock;
daniele	29:1a47b7151851	1028	hdr = (struct pico_tcp_hdr *) f->transport_hdr;
daniele	29:1a47b7151851	1029	hdr->len = (PICO_SIZE_TCPHDR + opt_len) << 2 \| t->jumbo;
daniele	29:1a47b7151851	1030	hdr->flags = PICO_TCP_FIN \| PICO_TCP_ACK;
daniele	29:1a47b7151851	1031	hdr->ack = long_be(t->rcv_nxt);
daniele	29:1a47b7151851	1032	t->rcv_ackd = t->rcv_nxt;
daniele	29:1a47b7151851	1033	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	1034	tcp_set_space(t);
daniele	29:1a47b7151851	1035	tcp_add_options(t,f, PICO_TCP_FIN, opt_len);
daniele	29:1a47b7151851	1036	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	1037	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	1038	hdr->seq = long_be(t->snd_nxt);
daniele	29:1a47b7151851	1039
daniele	29:1a47b7151851	1040	f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
daniele	29:1a47b7151851	1041	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	1042	hdr->crc = 0;
daniele	29:1a47b7151851	1043	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	1044	//tcp_dbg("SENDING FIN...\n");
daniele	29:1a47b7151851	1045	/* TCP: ENQUEUE to PROTO ( Pure ACK ) */
daniele	29:1a47b7151851	1046	pico_enqueue(&tcp_out, f);
daniele	29:1a47b7151851	1047	t->snd_nxt++;
daniele	29:1a47b7151851	1048	}
daniele	29:1a47b7151851	1049
daniele	29:1a47b7151851	1050	static void tcp_sack_prepare(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	1051	{
daniele	29:1a47b7151851	1052	struct pico_frame *pkt;
daniele	29:1a47b7151851	1053	uint32_t left=0, right=0;
daniele	29:1a47b7151851	1054	struct tcp_sack_block *sb;
daniele	29:1a47b7151851	1055	int n = 0;
daniele	29:1a47b7151851	1056	if (t->sacks) /* previous sacks are pending */
daniele	29:1a47b7151851	1057	return;
daniele	29:1a47b7151851	1058
daniele	29:1a47b7151851	1059	pkt = first_segment(&t->tcpq_in);
daniele	29:1a47b7151851	1060	while(n < 3) {
daniele	29:1a47b7151851	1061	if (!pkt) {
daniele	29:1a47b7151851	1062	if(left) {
daniele	29:1a47b7151851	1063	sb = pico_zalloc(sizeof(struct tcp_sack_block));
daniele	29:1a47b7151851	1064	if (!sb)
daniele	29:1a47b7151851	1065	break;
daniele	29:1a47b7151851	1066	sb->left = long_be(left);
daniele	29:1a47b7151851	1067	sb->right = long_be(right);
daniele	29:1a47b7151851	1068	n++;
daniele	29:1a47b7151851	1069	sb->next = t->sacks;
daniele	29:1a47b7151851	1070	t->sacks = sb;
daniele	29:1a47b7151851	1071	left = 0;
daniele	29:1a47b7151851	1072	right = 0;
daniele	29:1a47b7151851	1073	}
daniele	29:1a47b7151851	1074	break;
daniele	29:1a47b7151851	1075	}
daniele	29:1a47b7151851	1076	if ((SEQN(pkt) < t->rcv_nxt)) {
daniele	29:1a47b7151851	1077	pkt = next_segment(&t->tcpq_in, pkt);
daniele	29:1a47b7151851	1078	continue;
daniele	29:1a47b7151851	1079	}
daniele	29:1a47b7151851	1080	if (!left) {
daniele	29:1a47b7151851	1081	left = SEQN(pkt);
daniele	29:1a47b7151851	1082	right = SEQN(pkt) + pkt->payload_len;
daniele	29:1a47b7151851	1083	pkt = next_segment(&t->tcpq_in, pkt);
daniele	29:1a47b7151851	1084	continue;
daniele	29:1a47b7151851	1085	}
daniele	29:1a47b7151851	1086	if(SEQN(pkt) == (right + 1)) {
daniele	29:1a47b7151851	1087	right += pkt->payload_len;
daniele	29:1a47b7151851	1088	pkt = next_segment(&t->tcpq_in, pkt);
daniele	29:1a47b7151851	1089	continue;
daniele	29:1a47b7151851	1090	} else {
daniele	29:1a47b7151851	1091	sb = pico_zalloc(sizeof(struct tcp_sack_block));
daniele	29:1a47b7151851	1092	if (!sb)
daniele	29:1a47b7151851	1093	break;
daniele	29:1a47b7151851	1094	sb->left = long_be(left);
daniele	29:1a47b7151851	1095	sb->right = long_be(right);
daniele	29:1a47b7151851	1096	n++;
daniele	29:1a47b7151851	1097	sb->next = t->sacks;
daniele	29:1a47b7151851	1098	t->sacks = sb;
daniele	29:1a47b7151851	1099	left = 0;
daniele	29:1a47b7151851	1100	right = 0;
daniele	29:1a47b7151851	1101	pkt = next_segment(&t->tcpq_in, pkt);
daniele	29:1a47b7151851	1102	}
daniele	29:1a47b7151851	1103	}
daniele	29:1a47b7151851	1104	}
daniele	29:1a47b7151851	1105
daniele	29:1a47b7151851	1106	static int tcp_data_in(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1107	{
daniele	29:1a47b7151851	1108	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1109	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) f->transport_hdr;
daniele	29:1a47b7151851	1110
daniele	29:1a47b7151851	1111	if (((hdr->len & 0xf0) >> 2) <= f->transport_len) {
daniele	29:1a47b7151851	1112	tcp_parse_options(f);
daniele	29:1a47b7151851	1113	f->payload = f->transport_hdr + ((hdr->len & 0xf0) >>2);
daniele	29:1a47b7151851	1114	f->payload_len = f->transport_len - ((hdr->len & 0xf0) >>2);
daniele	29:1a47b7151851	1115
daniele	29:1a47b7151851	1116	if (seq_compare(SEQN(f), t->rcv_nxt) >= 0) {
daniele	29:1a47b7151851	1117	struct pico_frame *cpy = pico_frame_copy(f);
daniele	29:1a47b7151851	1118	struct pico_frame *nxt;
daniele	29:1a47b7151851	1119	/* Enqueue: try to put into RCV buffer */
daniele	29:1a47b7151851	1120	if (pico_enqueue_segment(&t->tcpq_in, cpy) <= 0) {
daniele	29:1a47b7151851	1121	pico_frame_discard(cpy);
daniele	29:1a47b7151851	1122	return -1;
daniele	29:1a47b7151851	1123	}
daniele	29:1a47b7151851	1124	if (seq_compare(SEQN(f), t->rcv_nxt) == 0) { /* Exactly what we expected */
daniele	29:1a47b7151851	1125	t->rcv_nxt = SEQN(f) + f->payload_len;
daniele	29:1a47b7151851	1126	nxt = peek_segment(&t->tcpq_in, t->rcv_nxt);
daniele	29:1a47b7151851	1127	while(nxt) {
daniele	29:1a47b7151851	1128	tcp_dbg("scrolling rcv_nxt...%08x\n", t->rcv_nxt);
daniele	29:1a47b7151851	1129	t->rcv_nxt += f->payload_len;
daniele	29:1a47b7151851	1130	nxt = peek_segment(&t->tcpq_in, t->rcv_nxt);
daniele	29:1a47b7151851	1131	}
daniele	29:1a47b7151851	1132	t->sock.ev_pending \|= PICO_SOCK_EV_RD;
daniele	29:1a47b7151851	1133	t->rcv_nxt = SEQN(f) + f->payload_len;
daniele	29:1a47b7151851	1134	} else {
daniele	29:1a47b7151851	1135	tcp_dbg("TCP> lo segment. Possible retransmission. (exp: %x got: %x)\n", t->rcv_nxt, SEQN(f));
daniele	29:1a47b7151851	1136	}
daniele	29:1a47b7151851	1137	} else {
daniele	29:1a47b7151851	1138	tcp_dbg("TCP> hi segment. Possible packet loss. I'll dupack this. (exp: %x got: %x)\n", t->rcv_nxt, SEQN(f));
daniele	29:1a47b7151851	1139	if (t->sack_ok) {
daniele	29:1a47b7151851	1140	tcp_sack_prepare(t);
daniele	29:1a47b7151851	1141	}
daniele	29:1a47b7151851	1142	}
daniele	29:1a47b7151851	1143	/* In either case, ack til recv_nxt. */
daniele	29:1a47b7151851	1144	if ( ((t->sock.state & PICO_SOCKET_STATE_TCP) != PICO_SOCKET_STATE_TCP_CLOSE_WAIT) && ((t->sock.state & PICO_SOCKET_STATE_TCP) != PICO_SOCKET_STATE_TCP_SYN_SENT) && ((t->sock.state & PICO_SOCKET_STATE_TCP) != PICO_SOCKET_STATE_TCP_SYN_RECV)) {
daniele	29:1a47b7151851	1145	//tcp_dbg("SENDACK CALLED FROM OUTSIDE tcp_synack, state %x\n",t->sock.state);
daniele	29:1a47b7151851	1146	tcp_send_ack(t);
daniele	29:1a47b7151851	1147	} else {
daniele	29:1a47b7151851	1148	//tcp_dbg("SENDACK PREVENTED IN SYNSENT STATE\n");
daniele	29:1a47b7151851	1149	}
daniele	29:1a47b7151851	1150	return 0;
daniele	29:1a47b7151851	1151	} else {
daniele	29:1a47b7151851	1152	tcp_dbg("TCP: invalid data in pkt len, exp: %d, got %d\n", (hdr->len & 0xf0) >> 2, f->transport_len);
daniele	29:1a47b7151851	1153	return -1;
daniele	29:1a47b7151851	1154	}
daniele	29:1a47b7151851	1155	}
daniele	29:1a47b7151851	1156
daniele	29:1a47b7151851	1157	static int tcp_ack_advance_una(struct pico_socket_tcp t, struct pico_frame f)
daniele	29:1a47b7151851	1158	{
daniele	29:1a47b7151851	1159	int ret = release_all_until(&t->tcpq_out, ACKN(f));
daniele	29:1a47b7151851	1160	if (ret > 0)
daniele	29:1a47b7151851	1161	t->sock.ev_pending \|= PICO_SOCK_EV_WR;
daniele	29:1a47b7151851	1162	return ret;
daniele	29:1a47b7151851	1163	}
daniele	29:1a47b7151851	1164
daniele	29:1a47b7151851	1165	static uint16_t time_diff(unsigned long a, unsigned long b)
daniele	29:1a47b7151851	1166	{
daniele	29:1a47b7151851	1167	if (a >= b)
daniele	29:1a47b7151851	1168	return (a - b);
daniele	29:1a47b7151851	1169	else
daniele	29:1a47b7151851	1170	return (b - a);
daniele	29:1a47b7151851	1171	}
daniele	29:1a47b7151851	1172
daniele	29:1a47b7151851	1173	static void tcp_rtt(struct pico_socket_tcp *t, uint32_t rtt)
daniele	29:1a47b7151851	1174	{
daniele	29:1a47b7151851	1175
daniele	29:1a47b7151851	1176	uint32_t avg = t->avg_rtt;
daniele	29:1a47b7151851	1177	uint32_t rvar = t->rttvar;
daniele	29:1a47b7151851	1178	if (!avg) {
daniele	29:1a47b7151851	1179	/* This follows RFC2988
daniele	29:1a47b7151851	1180	* (2.2) When the first RTT measurement R is made, the host MUST set
daniele	29:1a47b7151851	1181	*
daniele	29:1a47b7151851	1182	* SRTT <- R
daniele	29:1a47b7151851	1183	* RTTVAR <- R/2
daniele	29:1a47b7151851	1184	* RTO <- SRTT + max (G, K*RTTVAR)
daniele	29:1a47b7151851	1185	*/
daniele	29:1a47b7151851	1186	t->avg_rtt = rtt;
daniele	29:1a47b7151851	1187	t->rttvar = rtt >> 1;
daniele	29:1a47b7151851	1188	t->rto = t->avg_rtt + (t->rttvar << 4);
daniele	29:1a47b7151851	1189	} else {
daniele	29:1a47b7151851	1190	int var = (t->avg_rtt - rtt);
daniele	29:1a47b7151851	1191	if (var < 0)
daniele	29:1a47b7151851	1192	var = 0-var;
daniele	29:1a47b7151851	1193	/* RFC2988, section (2.3). Alpha and beta are the ones suggested. */
daniele	29:1a47b7151851	1194
daniele	29:1a47b7151851	1195	/* First, evaluate a new value for the rttvar */
daniele	29:1a47b7151851	1196	t->rttvar <<= 2;
daniele	29:1a47b7151851	1197	t->rttvar -= rvar;
daniele	29:1a47b7151851	1198	t->rttvar += var;
daniele	29:1a47b7151851	1199	t->rttvar >>= 2;
daniele	29:1a47b7151851	1200
daniele	29:1a47b7151851	1201	/* Then, calculate the new avg_rtt */
daniele	29:1a47b7151851	1202	t->avg_rtt <<= 3;
daniele	29:1a47b7151851	1203	t->avg_rtt -= avg;
daniele	29:1a47b7151851	1204	t->avg_rtt += rtt;
daniele	29:1a47b7151851	1205	t->avg_rtt >>= 3;
daniele	29:1a47b7151851	1206
daniele	29:1a47b7151851	1207	/* Finally, assign a new value for the RTO, as specified in the RFC, with K=4 */
daniele	29:1a47b7151851	1208	t->rto = t->avg_rtt + (t->rttvar << 2);
daniele	29:1a47b7151851	1209	}
daniele	29:1a47b7151851	1210	tcp_dbg(" -----=============== RTT AVG: %u RTTVAR: %u RTO: %u ======================----\n", t->avg_rtt, t->rttvar, t->rto);
daniele	29:1a47b7151851	1211	}
daniele	29:1a47b7151851	1212
daniele	29:1a47b7151851	1213	static void tcp_congestion_control(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	1214	{
daniele	29:1a47b7151851	1215	if (t->x_mode > PICO_TCP_LOOKAHEAD)
daniele	29:1a47b7151851	1216	return;
daniele	29:1a47b7151851	1217	if (t->cwnd > t->tcpq_out.frames) {
daniele	29:1a47b7151851	1218	tcp_dbg("Limited by app: %d\n", t->cwnd);
daniele	29:1a47b7151851	1219	return;
daniele	29:1a47b7151851	1220	}
daniele	29:1a47b7151851	1221	tcp_dbg("Doing congestion control\n");
daniele	29:1a47b7151851	1222	if (t->cwnd < t->ssthresh) {
daniele	29:1a47b7151851	1223	t->cwnd++;
daniele	29:1a47b7151851	1224	} else {
daniele	29:1a47b7151851	1225	t->cwnd_counter++;
daniele	29:1a47b7151851	1226	if (t->cwnd_counter >= t->cwnd) {
daniele	29:1a47b7151851	1227	t->cwnd++;
daniele	29:1a47b7151851	1228	t->cwnd_counter = 0;
daniele	29:1a47b7151851	1229	}
daniele	29:1a47b7151851	1230	}
daniele	29:1a47b7151851	1231	tcp_dbg("TCP_CWND, %lu, %u, %u, %u\n", pico_tick, t->cwnd, t->ssthresh, t->in_flight);
daniele	29:1a47b7151851	1232	}
daniele	29:1a47b7151851	1233
daniele	29:1a47b7151851	1234	static void add_retransmission_timer(struct pico_socket_tcp *t, unsigned long next_ts);
daniele	29:1a47b7151851	1235	static void tcp_retrans_timeout(unsigned long val, void *sock)
daniele	29:1a47b7151851	1236	{
daniele	29:1a47b7151851	1237	struct pico_socket_tcp t = (struct pico_socket_tcp ) sock;
daniele	29:1a47b7151851	1238	struct pico_frame *f = NULL;
daniele	29:1a47b7151851	1239	unsigned long limit = val - t->rto;
daniele	29:1a47b7151851	1240	struct pico_tcp_hdr *hdr;
tass	32:865c101e0874	1241	if( t->sock.net && ((t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_ESTABLISHED
tass	32:865c101e0874	1242	\|\| (t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_CLOSE_WAIT) )
daniele	29:1a47b7151851	1243	{
tass	37:bdf736327c71	1244	tcp_dbg("\n\nTIMEOUT! backoff = %d\n", t->backoff);
daniele	29:1a47b7151851	1245	/* was timer cancelled? */
daniele	29:1a47b7151851	1246	if (t->timer_running == 0) {
daniele	29:1a47b7151851	1247	add_retransmission_timer(t, 0);
daniele	29:1a47b7151851	1248	return;
daniele	29:1a47b7151851	1249	}
daniele	29:1a47b7151851	1250	t->timer_running--;
daniele	29:1a47b7151851	1251
daniele	29:1a47b7151851	1252	f = first_segment(&t->tcpq_out);
daniele	29:1a47b7151851	1253	while (f) {
daniele	29:1a47b7151851	1254	if ((t->x_mode == PICO_TCP_WINDOW_FULL) \|\|
daniele	29:1a47b7151851	1255	((f->timestamp != 0) && (f->timestamp <= limit))) {
daniele	29:1a47b7151851	1256	struct pico_frame *cpy;
daniele	29:1a47b7151851	1257	hdr = (struct pico_tcp_hdr *)f->transport_hdr;
daniele	29:1a47b7151851	1258	tcp_dbg("TCP BLACKOUT> TIMED OUT (output) frame %08x, len= %d rto=%d Win full: %d frame flags: %04x\n", SEQN(f), f->payload_len, t->rto, t->x_mode == PICO_TCP_WINDOW_FULL, f->flags);
daniele	29:1a47b7151851	1259	if ((t->x_mode != PICO_TCP_WINDOW_FULL) ) {
daniele	29:1a47b7151851	1260	t->x_mode = PICO_TCP_BLACKOUT;
daniele	29:1a47b7151851	1261	tcp_dbg("Mode: Blackout.\n");
daniele	29:1a47b7151851	1262	t->cwnd = PICO_TCP_IW;
daniele	29:1a47b7151851	1263	t->in_flight = 0;
daniele	29:1a47b7151851	1264	}
daniele	29:1a47b7151851	1265	f->timestamp = pico_tick;
daniele	29:1a47b7151851	1266	tcp_add_options(t, f, 0, f->transport_len - f->payload_len - PICO_SIZE_TCPHDR);
daniele	29:1a47b7151851	1267	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	1268	hdr->flags \|= PICO_TCP_PSH;
daniele	29:1a47b7151851	1269	hdr->ack = long_be(t->rcv_nxt);
daniele	29:1a47b7151851	1270	hdr->crc = 0;
daniele	29:1a47b7151851	1271	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	1272	/* TCP: ENQUEUE to PROTO ( retransmit )*/
daniele	29:1a47b7151851	1273	cpy = pico_frame_copy(f);
daniele	29:1a47b7151851	1274	if (pico_enqueue(&tcp_out, cpy) > 0) {
daniele	29:1a47b7151851	1275	t->backoff++;
daniele	29:1a47b7151851	1276	add_retransmission_timer(t, (t->rto << t->backoff) + pico_tick);
daniele	29:1a47b7151851	1277	tcp_dbg("TCP_CWND, %lu, %u, %u, %u\n", pico_tick, t->cwnd, t->ssthresh, t->in_flight);
daniele	29:1a47b7151851	1278	return;
daniele	29:1a47b7151851	1279	} else {
daniele	29:1a47b7151851	1280	add_retransmission_timer(t, (t->rto << t->backoff) + pico_tick);
daniele	29:1a47b7151851	1281	pico_frame_discard(cpy);
daniele	29:1a47b7151851	1282	}
daniele	29:1a47b7151851	1283	}
daniele	29:1a47b7151851	1284	f = next_segment(&t->tcpq_out, f);
daniele	29:1a47b7151851	1285	}
daniele	29:1a47b7151851	1286	t->backoff = 0;
daniele	29:1a47b7151851	1287	add_retransmission_timer(t, 0);
daniele	29:1a47b7151851	1288	if (t->tcpq_out.size < t->tcpq_out.max_size)
daniele	29:1a47b7151851	1289	t->sock.ev_pending \|= PICO_SOCK_EV_WR;
daniele	29:1a47b7151851	1290	return;
daniele	29:1a47b7151851	1291	}
daniele	29:1a47b7151851	1292	}
daniele	29:1a47b7151851	1293
daniele	29:1a47b7151851	1294	static void add_retransmission_timer(struct pico_socket_tcp *t, unsigned long next_ts)
daniele	29:1a47b7151851	1295	{
daniele	29:1a47b7151851	1296	struct pico_tree_node * index;
daniele	29:1a47b7151851	1297
daniele	29:1a47b7151851	1298	if (t->timer_running > 0)
daniele	29:1a47b7151851	1299	return;
daniele	29:1a47b7151851	1300
daniele	29:1a47b7151851	1301	if (next_ts == 0) {
daniele	29:1a47b7151851	1302	struct pico_frame *f;
daniele	29:1a47b7151851	1303
daniele	29:1a47b7151851	1304	pico_tree_foreach(index,&t->tcpq_out.pool){
daniele	29:1a47b7151851	1305	f = index->keyValue;
daniele	29:1a47b7151851	1306	if (((next_ts == 0) \|\| (f->timestamp < next_ts)) && (f->timestamp > 0)) {
daniele	29:1a47b7151851	1307	next_ts = f->timestamp;
daniele	29:1a47b7151851	1308	}
daniele	29:1a47b7151851	1309	}
daniele	29:1a47b7151851	1310	}
daniele	29:1a47b7151851	1311	if (next_ts > 0) {
daniele	29:1a47b7151851	1312	if ((next_ts + t->rto) > pico_tick) {
daniele	29:1a47b7151851	1313	pico_timer_add(next_ts + t->rto - pico_tick, tcp_retrans_timeout, t);
daniele	29:1a47b7151851	1314	} else {
daniele	29:1a47b7151851	1315	pico_timer_add(1, tcp_retrans_timeout, t);
daniele	29:1a47b7151851	1316	}
daniele	29:1a47b7151851	1317	t->timer_running++;
daniele	29:1a47b7151851	1318	}
daniele	29:1a47b7151851	1319	}
daniele	29:1a47b7151851	1320
daniele	29:1a47b7151851	1321	static int tcp_retrans(struct pico_socket_tcp t, struct pico_frame f)
daniele	29:1a47b7151851	1322	{
daniele	29:1a47b7151851	1323	struct pico_frame *cpy;
daniele	29:1a47b7151851	1324	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	1325	if (f) {
daniele	29:1a47b7151851	1326	hdr = (struct pico_tcp_hdr *)f->transport_hdr;
daniele	29:1a47b7151851	1327	tcp_dbg("TCP> RETRANS (by dupack) frame %08x, len= %d\n", SEQN(f), f->payload_len);
daniele	29:1a47b7151851	1328	f->timestamp = pico_tick;
daniele	29:1a47b7151851	1329	tcp_add_options(t, f, 0, f->transport_len - f->payload_len - PICO_SIZE_TCPHDR);
daniele	29:1a47b7151851	1330	hdr->rwnd = short_be(t->wnd);
daniele	29:1a47b7151851	1331	hdr->flags \|= PICO_TCP_PSH;
daniele	29:1a47b7151851	1332	hdr->ack = long_be(t->rcv_nxt);
daniele	29:1a47b7151851	1333	hdr->crc = 0;
daniele	29:1a47b7151851	1334	hdr->crc = short_be(pico_tcp_checksum_ipv4(f));
daniele	29:1a47b7151851	1335	/* TCP: ENQUEUE to PROTO ( retransmit )*/
daniele	29:1a47b7151851	1336	cpy = pico_frame_copy(f);
daniele	29:1a47b7151851	1337	if (pico_enqueue(&tcp_out, cpy) > 0) {
daniele	29:1a47b7151851	1338	t->in_flight++;
daniele	29:1a47b7151851	1339	t->snd_last_out = SEQN(cpy);
daniele	29:1a47b7151851	1340	add_retransmission_timer(t, pico_tick + t->rto);
daniele	29:1a47b7151851	1341	} else {
daniele	29:1a47b7151851	1342	pico_frame_discard(cpy);
daniele	29:1a47b7151851	1343	}
daniele	29:1a47b7151851	1344	return(f->payload_len);
daniele	29:1a47b7151851	1345	}
daniele	29:1a47b7151851	1346	return 0;
daniele	29:1a47b7151851	1347	}
daniele	29:1a47b7151851	1348
daniele	29:1a47b7151851	1349	#ifdef TCP_ACK_DBG
daniele	29:1a47b7151851	1350	static void tcp_ack_dbg(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1351	{
daniele	29:1a47b7151851	1352	uint32_t una, nxt, ack, cur;
daniele	29:1a47b7151851	1353	struct pico_frame una_f = NULL, cur_f;
daniele	29:1a47b7151851	1354	struct pico_tree_node *idx;
daniele	29:1a47b7151851	1355	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1356	char info[64];
daniele	29:1a47b7151851	1357	char tmp[64];
daniele	29:1a47b7151851	1358	ack = ACKN(f);
daniele	29:1a47b7151851	1359	nxt = t->snd_nxt;
daniele	29:1a47b7151851	1360	tcp_dbg("===================================\n");
daniele	29:1a47b7151851	1361	tcp_dbg("Queue out (%d/%d). ACKED=%08x\n", t->tcpq_out.size, t->tcpq_out.max_size, ack);
daniele	29:1a47b7151851	1362
daniele	29:1a47b7151851	1363	pico_tree_foreach(idx, &t->tcpq_out.pool) {
daniele	29:1a47b7151851	1364	info[0] = 0;
daniele	29:1a47b7151851	1365	cur_f = idx->keyValue;
daniele	29:1a47b7151851	1366	cur = SEQN(cur_f);
daniele	29:1a47b7151851	1367	if (!una_f) {
daniele	29:1a47b7151851	1368	una_f = cur_f;
daniele	29:1a47b7151851	1369	una = SEQN(una_f);
daniele	29:1a47b7151851	1370	}
daniele	29:1a47b7151851	1371
daniele	29:1a47b7151851	1372	if (cur == nxt) {
daniele	29:1a47b7151851	1373	strncpy(tmp, info, strlen(info));
daniele	29:1a47b7151851	1374	snprintf(info,64, "%s SND_NXT", tmp);
daniele	29:1a47b7151851	1375	}
daniele	29:1a47b7151851	1376	if (cur == ack) {
daniele	29:1a47b7151851	1377	strncpy(tmp, info, strlen(info));
daniele	29:1a47b7151851	1378	snprintf(info,64, "%s ACK", tmp);
daniele	29:1a47b7151851	1379	}
daniele	29:1a47b7151851	1380	if (cur == una) {
daniele	29:1a47b7151851	1381	strncpy(tmp, info, strlen(info));
daniele	29:1a47b7151851	1382	snprintf(info,64, "%s SND_UNA", tmp);
daniele	29:1a47b7151851	1383	}
daniele	29:1a47b7151851	1384	if (cur == t->snd_last) {
daniele	29:1a47b7151851	1385	strncpy(tmp, info, strlen(info));
daniele	29:1a47b7151851	1386	snprintf(info,64, "%s SND_LAST", tmp);
daniele	29:1a47b7151851	1387	}
daniele	29:1a47b7151851	1388	tcp_dbg("%08x %d%s\n", cur, cur_f->payload_len, info);
daniele	29:1a47b7151851	1389
daniele	29:1a47b7151851	1390	}
daniele	29:1a47b7151851	1391	tcp_dbg("SND_NXT is %08x, snd_LAST is %08x", nxt, t->snd_last);
daniele	29:1a47b7151851	1392	tcp_dbg("===================================\n");
daniele	29:1a47b7151851	1393	tcp_dbg("\n\n");
daniele	29:1a47b7151851	1394	}
daniele	29:1a47b7151851	1395	#endif
daniele	29:1a47b7151851	1396
daniele	29:1a47b7151851	1397	static int tcp_ack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1398	{
daniele	29:1a47b7151851	1399	struct pico_frame f_new; / use with Nagle to push to out queue */
daniele	29:1a47b7151851	1400	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1401	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) f->transport_hdr;
daniele	29:1a47b7151851	1402	uint32_t rtt = 0;
daniele	29:1a47b7151851	1403	int acked = 0;
daniele	29:1a47b7151851	1404	struct pico_frame *una = NULL;
daniele	29:1a47b7151851	1405	if ((hdr->flags & PICO_TCP_ACK) == 0)
daniele	29:1a47b7151851	1406	return -1;
daniele	29:1a47b7151851	1407
daniele	29:1a47b7151851	1408	#ifdef TCP_ACK_DBG
daniele	29:1a47b7151851	1409	tcp_ack_dbg(s,f);
daniele	29:1a47b7151851	1410	#endif
daniele	29:1a47b7151851	1411
daniele	29:1a47b7151851	1412	tcp_parse_options(f);
daniele	29:1a47b7151851	1413	t->recv_wnd = short_be(hdr->rwnd);
daniele	29:1a47b7151851	1414
daniele	29:1a47b7151851	1415	acked = tcp_ack_advance_una(t, f);
daniele	29:1a47b7151851	1416	una = first_segment(&t->tcpq_out);
daniele	29:1a47b7151851	1417
daniele	29:1a47b7151851	1418	if ((t->x_mode == PICO_TCP_BLACKOUT) \|\|
daniele	29:1a47b7151851	1419	((t->x_mode == PICO_TCP_WINDOW_FULL) && ((t->recv_wnd << t->recv_wnd_scale) > t->mss))) {
daniele	29:1a47b7151851	1420	tcp_dbg("Re-entering look-ahead...\n\n\n");
daniele	29:1a47b7151851	1421	t->x_mode = PICO_TCP_LOOKAHEAD;
daniele	29:1a47b7151851	1422	t->backoff = 0;
daniele	29:1a47b7151851	1423	}
daniele	29:1a47b7151851	1424
daniele	29:1a47b7151851	1425	/* One should be acked. */
daniele	29:1a47b7151851	1426	// if ((acked == 0) && (t->in_flight > 0))
daniele	29:1a47b7151851	1427	if ((acked == 0) && (f->payload_len == 0) && (t->in_flight > 0))
daniele	29:1a47b7151851	1428	t->in_flight--;
daniele	29:1a47b7151851	1429	if (!una \|\| acked > 0) {
daniele	29:1a47b7151851	1430	t->x_mode = PICO_TCP_LOOKAHEAD;
daniele	29:1a47b7151851	1431	tcp_dbg("Mode: Look-ahead. In flight: %d/%d buf: %d\n", t->in_flight, t->cwnd, t->tcpq_out.frames);
daniele	29:1a47b7151851	1432	t->backoff = 0;
daniele	29:1a47b7151851	1433
daniele	29:1a47b7151851	1434	/* Do rtt/rttvar/rto calculations */
daniele	29:1a47b7151851	1435	if(una && (una->timestamp != 0)) {
daniele	29:1a47b7151851	1436	rtt = time_diff(pico_tick, una->timestamp);
daniele	29:1a47b7151851	1437	if (rtt)
daniele	29:1a47b7151851	1438	tcp_rtt(t, rtt);
daniele	29:1a47b7151851	1439	}
daniele	29:1a47b7151851	1440
daniele	29:1a47b7151851	1441	tcp_dbg("TCP ACK> FRESH ACK %08x (acked %d) Queue size: %u/%u frames: %u cwnd: %u in_flight: %u snd_una: %u\n", ACKN(f), acked, t->tcpq_out.size, t->tcpq_out.max_size, t->tcpq_out.frames, t->cwnd, t->in_flight, SEQN(una));
daniele	29:1a47b7151851	1442	if (acked > t->in_flight) {
daniele	29:1a47b7151851	1443	tcp_dbg("WARNING: in flight < 0\n");
daniele	29:1a47b7151851	1444	t->in_flight = 0;
daniele	29:1a47b7151851	1445	} else
daniele	29:1a47b7151851	1446	t->in_flight -= (acked);
daniele	29:1a47b7151851	1447
daniele	29:1a47b7151851	1448	} else if ((t->snd_old_ack == ACKN(f)) && /* We've just seen this ack, and... */
daniele	29:1a47b7151851	1449	((0 == (hdr->flags & (PICO_TCP_PSH \| PICO_TCP_SYN))) &&
daniele	29:1a47b7151851	1450	(f->payload_len == 0)) && /* This is a pure ack, and... */
daniele	29:1a47b7151851	1451	(ACKN(f) != t->snd_nxt)) /* There is something in flight awaiting to be acked... */
daniele	29:1a47b7151851	1452	{
daniele	29:1a47b7151851	1453	/* Process incoming duplicate ack. */
daniele	29:1a47b7151851	1454	if (t->x_mode < PICO_TCP_RECOVER) {
daniele	29:1a47b7151851	1455	t->x_mode++;
daniele	29:1a47b7151851	1456	tcp_dbg("Mode: DUPACK %d, due to PURE ACK %0x, len = %d\n", t->x_mode, SEQN(f), f->payload_len);
daniele	29:1a47b7151851	1457	tcp_dbg("ACK: %x - QUEUE: %x\n",ACKN(f), SEQN(first_segment(&t->tcpq_out)));
daniele	29:1a47b7151851	1458	if (t->x_mode == PICO_TCP_RECOVER) { /* Switching mode */
daniele	29:1a47b7151851	1459	t->snd_retry = SEQN(first_segment(&t->tcpq_out));
daniele	29:1a47b7151851	1460	if (t->ssthresh > t->cwnd)
daniele	29:1a47b7151851	1461	t->ssthresh >>=2;
daniele	29:1a47b7151851	1462	else
daniele	29:1a47b7151851	1463	t->ssthresh = (t->cwnd >> 1);
daniele	29:1a47b7151851	1464	if (t->ssthresh < 2)
daniele	29:1a47b7151851	1465	t->ssthresh = 2;
daniele	29:1a47b7151851	1466	}
daniele	29:1a47b7151851	1467	} else if (t->x_mode == PICO_TCP_RECOVER) {
daniele	29:1a47b7151851	1468	tcp_dbg("TCP RECOVER> DUPACK! snd_una: %08x, snd_nxt: %08x, acked now: %08x\n", SEQN(first_segment(&t->tcpq_out)), t->snd_nxt, ACKN(f));
daniele	29:1a47b7151851	1469	if (t->in_flight <= t->cwnd) {
daniele	29:1a47b7151851	1470	struct pico_frame *nxt = peek_segment(&t->tcpq_out, t->snd_retry);
daniele	29:1a47b7151851	1471	if (!nxt)
daniele	29:1a47b7151851	1472	nxt = first_segment(&t->tcpq_out);
daniele	29:1a47b7151851	1473
daniele	29:1a47b7151851	1474	while (nxt && (nxt->flags & PICO_FRAME_FLAG_SACKED) && (nxt != first_segment(&t->tcpq_out))) {
daniele	29:1a47b7151851	1475	tcp_dbg("Skipping %08x because it is sacked.\n", SEQN(nxt));
daniele	29:1a47b7151851	1476	nxt = next_segment(&t->tcpq_out, nxt);
daniele	29:1a47b7151851	1477	}
daniele	29:1a47b7151851	1478
daniele	29:1a47b7151851	1479	if (nxt && (seq_compare(SEQN(nxt), t->snd_nxt)) > 0)
daniele	29:1a47b7151851	1480	nxt = NULL;
daniele	29:1a47b7151851	1481	if (nxt && (seq_compare(SEQN(nxt), SEQN(first_segment(&t->tcpq_out))) > (t->recv_wnd << t->recv_wnd_scale)))
daniele	29:1a47b7151851	1482	nxt = NULL;
daniele	29:1a47b7151851	1483
daniele	29:1a47b7151851	1484	if(!nxt)
daniele	29:1a47b7151851	1485	nxt = first_segment(&t->tcpq_out);
daniele	29:1a47b7151851	1486	if (nxt) {
daniele	29:1a47b7151851	1487	tcp_retrans(t, peek_segment(&t->tcpq_out, t->snd_retry));
daniele	29:1a47b7151851	1488	t->snd_retry = SEQN(nxt);
daniele	29:1a47b7151851	1489	}
daniele	29:1a47b7151851	1490	}
daniele	29:1a47b7151851	1491
daniele	29:1a47b7151851	1492	if (++t->cwnd_counter > 1) {
daniele	29:1a47b7151851	1493	t->cwnd--;
daniele	29:1a47b7151851	1494	if (t->cwnd < 2)
daniele	29:1a47b7151851	1495	t->cwnd = 2;
daniele	29:1a47b7151851	1496	t->cwnd_counter = 0;
daniele	29:1a47b7151851	1497	}
daniele	29:1a47b7151851	1498	} else {
daniele	29:1a47b7151851	1499	tcp_dbg("DUPACK in mode %d \n", t->x_mode);
daniele	29:1a47b7151851	1500
daniele	29:1a47b7151851	1501	}
daniele	29:1a47b7151851	1502	} /* End case duplicate ack detection */
daniele	29:1a47b7151851	1503
daniele	29:1a47b7151851	1504	/* Do congestion control */
daniele	29:1a47b7151851	1505	tcp_congestion_control(t);
daniele	29:1a47b7151851	1506	if ((acked > 0) && t->sock.wakeup) {
daniele	29:1a47b7151851	1507	if (t->tcpq_out.size < t->tcpq_out.max_size)
daniele	29:1a47b7151851	1508	t->sock.wakeup(PICO_SOCK_EV_WR, &(t->sock));
daniele	29:1a47b7151851	1509	//t->sock.ev_pending \|= PICO_SOCK_EV_WR;
daniele	29:1a47b7151851	1510	}
daniele	29:1a47b7151851	1511
daniele	29:1a47b7151851	1512	/* if Nagle enabled, check if no unack'ed data and fill out queue (till window) */
daniele	29:1a47b7151851	1513	if (IS_NAGLE_ENABLED((&(t->sock)))) {
daniele	29:1a47b7151851	1514	while (!IS_TCP_HOLDQ_EMPTY(t) && ((t->tcpq_out.max_size - t->tcpq_out.size) >= PICO_TCP_DEFAULT_MSS)) {
daniele	29:1a47b7151851	1515	tcp_dbg("TCP_ACK - NAGLE add new segment\n");
daniele	29:1a47b7151851	1516	f_new = pico_hold_segment_make(t);
daniele	29:1a47b7151851	1517	if (f_new == NULL)
daniele	29:1a47b7151851	1518	break; /* XXX corrupt !!! (or no memory) */
daniele	29:1a47b7151851	1519	if (pico_enqueue_segment(&t->tcpq_out,f_new) <= 0)
daniele	29:1a47b7151851	1520	// handle error
daniele	29:1a47b7151851	1521	tcp_dbg("TCP_ACK - NAGLE FAILED to enqueue in out\n");
daniele	29:1a47b7151851	1522	}
daniele	29:1a47b7151851	1523	}
daniele	29:1a47b7151851	1524
daniele	29:1a47b7151851	1525	/* If some space was created, put a few segments out. */
daniele	29:1a47b7151851	1526	tcp_dbg("TCP_CWND, %lu, %u, %u, %u\n", pico_tick, t->cwnd, t->ssthresh, t->in_flight);
daniele	29:1a47b7151851	1527	if (t->x_mode == PICO_TCP_LOOKAHEAD) {
daniele	29:1a47b7151851	1528	if ((t->cwnd >= t->in_flight) && (t->snd_nxt > t->snd_last_out)) {
daniele	29:1a47b7151851	1529	pico_tcp_output(&t->sock, t->cwnd - t->in_flight);
daniele	29:1a47b7151851	1530	}
daniele	29:1a47b7151851	1531	}
daniele	29:1a47b7151851	1532
daniele	29:1a47b7151851	1533	t->snd_old_ack = ACKN(f);
daniele	29:1a47b7151851	1534	return 0;
daniele	29:1a47b7151851	1535	}
daniele	29:1a47b7151851	1536
daniele	29:1a47b7151851	1537	static int tcp_finwaitack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1538	{
daniele	29:1a47b7151851	1539	tcp_dbg("RECEIVED ACK IN FIN_WAIT1\nTCP> IN STATE FIN_WAIT2\n");
daniele	29:1a47b7151851	1540
daniele	29:1a47b7151851	1541	/* acking part */
daniele	29:1a47b7151851	1542	tcp_ack(s,f);
daniele	29:1a47b7151851	1543	/* update TCP state */
daniele	29:1a47b7151851	1544	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1545	s->state \|= PICO_SOCKET_STATE_TCP_FIN_WAIT2;
daniele	29:1a47b7151851	1546
daniele	29:1a47b7151851	1547	return 0;
daniele	29:1a47b7151851	1548	}
daniele	29:1a47b7151851	1549
daniele	29:1a47b7151851	1550	static void tcp_deltcb(unsigned long when, void *arg)
daniele	29:1a47b7151851	1551	{
daniele	29:1a47b7151851	1552	struct pico_socket_tcp t = (struct pico_socket_tcp )arg;
daniele	29:1a47b7151851	1553	if (TCPSTATE(&t->sock) == PICO_SOCKET_STATE_TCP_TIME_WAIT) {
daniele	29:1a47b7151851	1554	tcp_dbg("TCP> state: time_wait, final timer expired, going to closed state\n");
daniele	29:1a47b7151851	1555	/* update state */
daniele	29:1a47b7151851	1556	(t->sock).state &= 0x00FFU;
daniele	29:1a47b7151851	1557	(t->sock).state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	1558	(t->sock).state &= 0xFF00U;
daniele	29:1a47b7151851	1559	(t->sock).state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	1560	/* call EV_FIN wakeup before deleting */
daniele	29:1a47b7151851	1561	if (t->sock.wakeup) {
daniele	29:1a47b7151851	1562	(t->sock).wakeup(PICO_SOCK_EV_FIN, &(t->sock));
daniele	29:1a47b7151851	1563	}
daniele	29:1a47b7151851	1564	/* delete socket */
daniele	29:1a47b7151851	1565	pico_socket_del(&t->sock);
daniele	29:1a47b7151851	1566	} else {
daniele	29:1a47b7151851	1567	tcp_dbg("TCP> trying to go to closed, wrong state\n");
daniele	29:1a47b7151851	1568	}
daniele	29:1a47b7151851	1569	}
daniele	29:1a47b7151851	1570
daniele	29:1a47b7151851	1571	static int tcp_finwaitfin(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1572	{
daniele	29:1a47b7151851	1573	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1574	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) (f->transport_hdr);
daniele	29:1a47b7151851	1575	tcp_dbg("TCP> received fin in FIN_WAIT2\n");
daniele	29:1a47b7151851	1576	/* received FIN, increase ACK nr */
daniele	29:1a47b7151851	1577	t->rcv_nxt = long_be(hdr->seq) + 1;
daniele	29:1a47b7151851	1578	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1579	s->state \|= PICO_SOCKET_STATE_TCP_TIME_WAIT;
daniele	29:1a47b7151851	1580	/* set SHUT_REMOTE */
daniele	29:1a47b7151851	1581	s->state \|= PICO_SOCKET_STATE_SHUT_REMOTE;
daniele	29:1a47b7151851	1582	if (s->wakeup)
daniele	29:1a47b7151851	1583	s->wakeup(PICO_SOCK_EV_CLOSE, s);
daniele	29:1a47b7151851	1584	if (f->payload_len > 0) /* needed?? */
daniele	29:1a47b7151851	1585	tcp_data_in(s,f);
daniele	29:1a47b7151851	1586	/* send ACK */
daniele	29:1a47b7151851	1587	tcp_send_ack(t);
daniele	29:1a47b7151851	1588	/* set timer */
daniele	29:1a47b7151851	1589	pico_timer_add(200, tcp_deltcb, t);
daniele	29:1a47b7151851	1590	return 0;
daniele	29:1a47b7151851	1591	}
daniele	29:1a47b7151851	1592
daniele	29:1a47b7151851	1593	static int tcp_closewaitack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1594	{
daniele	29:1a47b7151851	1595	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1596	tcp_dbg("TCP> received ack in CLOSING\n");
daniele	29:1a47b7151851	1597	/* acking part */
daniele	29:1a47b7151851	1598	tcp_ack(s,f);
daniele	29:1a47b7151851	1599	/* update TCP state */
daniele	29:1a47b7151851	1600	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1601	s->state \|= PICO_SOCKET_STATE_TCP_TIME_WAIT;
daniele	29:1a47b7151851	1602	/* set timer */
daniele	29:1a47b7151851	1603	pico_timer_add(200, tcp_deltcb, t);
daniele	29:1a47b7151851	1604	return 0;
daniele	29:1a47b7151851	1605	}
daniele	29:1a47b7151851	1606
daniele	29:1a47b7151851	1607	static int tcp_lastackwait(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1608	{
daniele	29:1a47b7151851	1609	tcp_dbg("TCP> state: last_ack, received ack, to closed\n");
daniele	29:1a47b7151851	1610	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1611	s->state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	1612	s->state &= 0xFF00U;
daniele	29:1a47b7151851	1613	s->state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	1614	/* call socket wakeup with EV_FIN */
daniele	29:1a47b7151851	1615	if (s->wakeup)
daniele	29:1a47b7151851	1616	s->wakeup(PICO_SOCK_EV_FIN, s);
daniele	29:1a47b7151851	1617	/* delete socket */
daniele	29:1a47b7151851	1618	pico_socket_del(s);
daniele	29:1a47b7151851	1619	return 0;
daniele	29:1a47b7151851	1620	}
daniele	29:1a47b7151851	1621
daniele	29:1a47b7151851	1622	static int tcp_syn(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1623	{
daniele	29:1a47b7151851	1624	/* TODO: Check against backlog length */
daniele	29:1a47b7151851	1625	struct pico_socket_tcp new = (struct pico_socket_tcp )pico_socket_clone(s);
daniele	29:1a47b7151851	1626	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr )f->transport_hdr;
daniele	29:1a47b7151851	1627	if (!new)
daniele	29:1a47b7151851	1628	return -1;
daniele	29:1a47b7151851	1629
daniele	29:1a47b7151851	1630	#ifdef PICO_TCP_SUPPORT_SOCKET_STATS
daniele	29:1a47b7151851	1631	pico_timer_add(2000, sock_stats, s);
daniele	29:1a47b7151851	1632	#endif
daniele	29:1a47b7151851	1633
daniele	29:1a47b7151851	1634	new->sock.remote_port = ((struct pico_trans *)f->transport_hdr)->sport;
daniele	29:1a47b7151851	1635	#ifdef PICO_SUPPORT_IPV4
daniele	29:1a47b7151851	1636	if (IS_IPV4(f)) {
daniele	29:1a47b7151851	1637	new->sock.remote_addr.ip4.addr = ((struct pico_ipv4_hdr *)(f->net_hdr))->src.addr;
daniele	29:1a47b7151851	1638	new->sock.local_addr.ip4.addr = ((struct pico_ipv4_hdr *)(f->net_hdr))->dst.addr;
daniele	29:1a47b7151851	1639	}
daniele	29:1a47b7151851	1640	#endif
daniele	29:1a47b7151851	1641	#ifdef PICO_SUPPORT_IPV6
daniele	29:1a47b7151851	1642	if (IS_IPV6(f)) {
daniele	29:1a47b7151851	1643	memcpy(new->sock.remote_addr.ip6.addr, ((struct pico_ipv6_hdr *)(f->net_hdr))->src, PICO_SIZE_IP6);
daniele	29:1a47b7151851	1644	memcpy(new->sock.remote_addr.ip6.addr, ((struct pico_ipv6_hdr *)(f->net_hdr))->src, PICO_SIZE_IP6);
daniele	29:1a47b7151851	1645	}
daniele	29:1a47b7151851	1646	#endif
daniele	29:1a47b7151851	1647
daniele	29:1a47b7151851	1648	/* Set socket limits */
daniele	29:1a47b7151851	1649	new->tcpq_in.max_size = PICO_DEFAULT_SOCKETQ;
daniele	29:1a47b7151851	1650	new->tcpq_out.max_size = PICO_DEFAULT_SOCKETQ;
daniele	29:1a47b7151851	1651	new->tcpq_hold.max_size = 2*PICO_TCP_DEFAULT_MSS;
daniele	29:1a47b7151851	1652
daniele	29:1a47b7151851	1653	f->sock = &new->sock;
daniele	29:1a47b7151851	1654	tcp_parse_options(f);
daniele	29:1a47b7151851	1655	new->mss = PICO_TCP_DEFAULT_MSS;
daniele	29:1a47b7151851	1656	new->rcv_nxt = long_be(hdr->seq) + 1;
daniele	29:1a47b7151851	1657	new->snd_nxt = long_be(pico_paws());
daniele	29:1a47b7151851	1658	new->snd_last = new->snd_nxt;
daniele	29:1a47b7151851	1659	new->cwnd = PICO_TCP_IW;
daniele	29:1a47b7151851	1660	new->ssthresh = 40;
daniele	29:1a47b7151851	1661	new->recv_wnd = short_be(hdr->rwnd);
daniele	29:1a47b7151851	1662	new->jumbo = hdr->len & 0x07;
daniele	29:1a47b7151851	1663	new->sock.parent = s;
daniele	29:1a47b7151851	1664	new->sock.wakeup = s->wakeup;
daniele	29:1a47b7151851	1665	/* Initialize timestamp values */
daniele	29:1a47b7151851	1666	new->sock.state = PICO_SOCKET_STATE_BOUND \| PICO_SOCKET_STATE_CONNECTED \| PICO_SOCKET_STATE_TCP_SYN_RECV;
daniele	29:1a47b7151851	1667	pico_socket_add(&new->sock);
daniele	29:1a47b7151851	1668	tcp_send_synack(&new->sock);
daniele	29:1a47b7151851	1669	tcp_dbg("SYNACK sent, socket added. snd_nxt is %08x\n", new->snd_nxt);
daniele	29:1a47b7151851	1670	return 0;
daniele	29:1a47b7151851	1671	}
daniele	29:1a47b7151851	1672
daniele	29:1a47b7151851	1673	static void tcp_set_init_point(struct pico_socket *s)
daniele	29:1a47b7151851	1674	{
daniele	29:1a47b7151851	1675	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1676	t->rcv_processed = t->rcv_nxt;
daniele	29:1a47b7151851	1677	}
daniele	29:1a47b7151851	1678
daniele	29:1a47b7151851	1679	static int tcp_synack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1680	{
daniele	29:1a47b7151851	1681	struct pico_socket_tcp t = (struct pico_socket_tcp ) s;
daniele	29:1a47b7151851	1682	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr )f->transport_hdr;
daniele	29:1a47b7151851	1683
daniele	29:1a47b7151851	1684	if (ACKN(f) == (1 + t->snd_nxt)) {
daniele	29:1a47b7151851	1685	t->rcv_nxt = long_be(hdr->seq);
daniele	29:1a47b7151851	1686	t->rcv_processed = t->rcv_nxt + 1;
daniele	29:1a47b7151851	1687	tcp_ack(s, f);
daniele	29:1a47b7151851	1688
daniele	29:1a47b7151851	1689	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1690	s->state \|= PICO_SOCKET_STATE_TCP_ESTABLISHED;
daniele	29:1a47b7151851	1691	tcp_dbg("TCP> Established. State: %x\n", s->state);
daniele	29:1a47b7151851	1692
daniele	29:1a47b7151851	1693	if (s->wakeup)
daniele	29:1a47b7151851	1694	s->wakeup(PICO_SOCK_EV_CONN, s);
daniele	29:1a47b7151851	1695	s->ev_pending \|= PICO_SOCK_EV_WR;
daniele	29:1a47b7151851	1696
daniele	29:1a47b7151851	1697	t->rcv_nxt++;
daniele	29:1a47b7151851	1698	t->snd_nxt++;
daniele	29:1a47b7151851	1699	tcp_send_ack(t); /* return ACK */
daniele	29:1a47b7151851	1700
daniele	29:1a47b7151851	1701	return 0;
daniele	29:1a47b7151851	1702
daniele	29:1a47b7151851	1703	} else {
daniele	29:1a47b7151851	1704	tcp_dbg("TCP> Not established, RST sent.\n");
daniele	29:1a47b7151851	1705	tcp_nosync_rst(s,f);
daniele	29:1a47b7151851	1706	return 0;
daniele	29:1a47b7151851	1707	}
daniele	29:1a47b7151851	1708	}
daniele	29:1a47b7151851	1709
daniele	29:1a47b7151851	1710	static int tcp_first_ack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1711	{
daniele	29:1a47b7151851	1712	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1713	tcp_dbg("ACK in SYN_RECV: expecting %08x got %08x\n", t->snd_nxt, ACKN(f));
daniele	29:1a47b7151851	1714	if (t->snd_nxt == ACKN(f)) {
daniele	29:1a47b7151851	1715	tcp_set_init_point(s);
daniele	29:1a47b7151851	1716	tcp_ack(s, f);
daniele	29:1a47b7151851	1717	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1718	s->state \|= PICO_SOCKET_STATE_TCP_ESTABLISHED;
daniele	29:1a47b7151851	1719	tcp_dbg("TCP: Established. State now: %04x\n", s->state);
daniele	29:1a47b7151851	1720	if( !s->parent && s->wakeup) { /* If the socket has no parent, -> sending socket that has a sim_open */
daniele	29:1a47b7151851	1721	tcp_dbg("FIRST ACK - No parent found -> sending socket\n");
daniele	29:1a47b7151851	1722	s->wakeup(PICO_SOCK_EV_CONN, s);
daniele	29:1a47b7151851	1723	}
daniele	29:1a47b7151851	1724	if (s->parent && s->parent->wakeup) {
daniele	29:1a47b7151851	1725	tcp_dbg("FIRST ACK - Parent found -> listening socket\n");
daniele	29:1a47b7151851	1726	s->wakeup = s->parent->wakeup;
daniele	29:1a47b7151851	1727	s->parent->wakeup(PICO_SOCK_EV_CONN, s->parent);
daniele	29:1a47b7151851	1728	}
daniele	29:1a47b7151851	1729	s->ev_pending \|= PICO_SOCK_EV_WR;
daniele	29:1a47b7151851	1730	tcp_dbg("%s: snd_nxt is now %08x\n", __FUNCTION__, t->snd_nxt);
daniele	29:1a47b7151851	1731	return 0;
daniele	29:1a47b7151851	1732	} else {
daniele	29:1a47b7151851	1733	tcp_nosync_rst(s,f);
daniele	29:1a47b7151851	1734	return 0;
daniele	29:1a47b7151851	1735	}
daniele	29:1a47b7151851	1736	}
daniele	29:1a47b7151851	1737
daniele	29:1a47b7151851	1738	static int tcp_closewait(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1739	{
daniele	29:1a47b7151851	1740
daniele	29:1a47b7151851	1741	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1742	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) (f->transport_hdr);
daniele	29:1a47b7151851	1743
tass	32:865c101e0874	1744
daniele	29:1a47b7151851	1745	if (f->payload_len > 0)
daniele	29:1a47b7151851	1746	tcp_data_in(s,f);
daniele	29:1a47b7151851	1747	if (f->flags & PICO_TCP_ACK)
daniele	29:1a47b7151851	1748	tcp_ack(s,f);
daniele	29:1a47b7151851	1749	if (seq_compare(SEQN(f), t->rcv_nxt) == 0) {
daniele	29:1a47b7151851	1750	/* received FIN, increase ACK nr */
daniele	29:1a47b7151851	1751	t->rcv_nxt = long_be(hdr->seq) + 1;
tass	32:865c101e0874	1752	s->state &= 0x00FFU;
tass	32:865c101e0874	1753	s->state \|= PICO_SOCKET_STATE_TCP_CLOSE_WAIT;
tass	32:865c101e0874	1754	/* set SHUT_REMOTE */
daniele	29:1a47b7151851	1755	s->state \|= PICO_SOCKET_STATE_SHUT_REMOTE;
daniele	29:1a47b7151851	1756	tcp_dbg("TCP> Close-wait\n");
tass	32:865c101e0874	1757
daniele	29:1a47b7151851	1758	if (s->wakeup){
daniele	29:1a47b7151851	1759	if(f->payload_len>0){
daniele	29:1a47b7151851	1760	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1761	t->sock.ev_pending \|=PICO_SOCK_EV_CLOSE;
daniele	29:1a47b7151851	1762	}else
daniele	29:1a47b7151851	1763	s->wakeup(PICO_SOCK_EV_CLOSE, s);
daniele	29:1a47b7151851	1764	}
daniele	29:1a47b7151851	1765	} else {
daniele	29:1a47b7151851	1766	tcp_send_ack(t); /* return ACK */
daniele	29:1a47b7151851	1767	}
daniele	29:1a47b7151851	1768	return 0;
daniele	29:1a47b7151851	1769	}
daniele	29:1a47b7151851	1770
daniele	29:1a47b7151851	1771	/static int tcp_fin(struct pico_socket s, struct pico_frame *f)
daniele	29:1a47b7151851	1772	{
daniele	29:1a47b7151851	1773	return 0;
daniele	29:1a47b7151851	1774	}*/
daniele	29:1a47b7151851	1775
daniele	29:1a47b7151851	1776	static int tcp_rcvfin(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1777	{
daniele	29:1a47b7151851	1778	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1779	tcp_dbg("TCP> Received FIN in FIN_WAIT1\n");
daniele	29:1a47b7151851	1780	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1781	s->state \|= PICO_SOCKET_STATE_TCP_CLOSING;
daniele	29:1a47b7151851	1782	t->rcv_processed = t->rcv_nxt + 1;
daniele	29:1a47b7151851	1783	t->rcv_nxt++;
daniele	29:1a47b7151851	1784	/* send ACK */
daniele	29:1a47b7151851	1785	tcp_send_ack(t);
daniele	29:1a47b7151851	1786	return 0;
daniele	29:1a47b7151851	1787	}
daniele	29:1a47b7151851	1788
daniele	29:1a47b7151851	1789	static int tcp_finack(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1790	{
daniele	29:1a47b7151851	1791	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1792	tcp_dbg("TCP> ENTERED finack\n");
daniele	29:1a47b7151851	1793	t->rcv_nxt++;
daniele	29:1a47b7151851	1794	/* send ACK */
daniele	29:1a47b7151851	1795	tcp_send_ack(t);
daniele	29:1a47b7151851	1796
daniele	29:1a47b7151851	1797	/* call socket wakeup with EV_FIN */
daniele	29:1a47b7151851	1798	if (s->wakeup)
daniele	29:1a47b7151851	1799	s->wakeup(PICO_SOCK_EV_FIN, s);
daniele	29:1a47b7151851	1800	s->state &= 0x00FFU;
daniele	29:1a47b7151851	1801	s->state \|= PICO_SOCKET_STATE_TCP_TIME_WAIT;
daniele	29:1a47b7151851	1802	/* set SHUT_REMOTE */
daniele	29:1a47b7151851	1803	s->state \|= PICO_SOCKET_STATE_SHUT_REMOTE;
daniele	29:1a47b7151851	1804	pico_timer_add(2000, tcp_deltcb, t);
daniele	29:1a47b7151851	1805
daniele	29:1a47b7151851	1806	return 0;
daniele	29:1a47b7151851	1807	}
daniele	29:1a47b7151851	1808
daniele	29:1a47b7151851	1809	static int tcp_rst(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1810	{
daniele	29:1a47b7151851	1811	struct pico_socket_tcp t = (struct pico_socket_tcp ) s;
daniele	29:1a47b7151851	1812	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) (f->transport_hdr);
daniele	29:1a47b7151851	1813
daniele	29:1a47b7151851	1814	tcp_dbg("TCP >>>>>>>>>>>>>> received RST <<<<<<<<<<<<<<<<<<<<\n");
daniele	29:1a47b7151851	1815	if ((s->state & PICO_SOCKET_STATE_TCP) == PICO_SOCKET_STATE_TCP_SYN_SENT) {
daniele	29:1a47b7151851	1816	/* the RST is acceptable if the ACK field acknowledges the SYN */
daniele	29:1a47b7151851	1817	if ((t->snd_nxt + 1) == ACKN(f)) { /* valid, got to closed state */
daniele	29:1a47b7151851	1818	/* update state */
daniele	29:1a47b7151851	1819	(t->sock).state &= 0x00FFU;
daniele	29:1a47b7151851	1820	(t->sock).state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	1821	(t->sock).state &= 0xFF00U;
daniele	29:1a47b7151851	1822	(t->sock).state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	1823
daniele	29:1a47b7151851	1824	/* call EV_FIN wakeup before deleting */
daniele	29:1a47b7151851	1825	if ((t->sock).wakeup)
daniele	29:1a47b7151851	1826	(t->sock).wakeup(PICO_SOCK_EV_FIN, &(t->sock));
daniele	29:1a47b7151851	1827
daniele	29:1a47b7151851	1828	/* call EV_ERR wakeup before deleting */
daniele	29:1a47b7151851	1829	pico_err = PICO_ERR_ECONNRESET;
daniele	29:1a47b7151851	1830	if ((t->sock).wakeup)
daniele	29:1a47b7151851	1831	(t->sock).wakeup(PICO_SOCK_EV_ERR, &(t->sock));
daniele	29:1a47b7151851	1832
daniele	29:1a47b7151851	1833	/* delete socket */
daniele	29:1a47b7151851	1834	pico_socket_del(&t->sock);
daniele	29:1a47b7151851	1835	} else { /* not valid, ignore */
daniele	29:1a47b7151851	1836	tcp_dbg("TCP RST> IGNORE\n");
daniele	29:1a47b7151851	1837	return 0;
daniele	29:1a47b7151851	1838	}
daniele	29:1a47b7151851	1839	} else { /* all other states */
daniele	29:1a47b7151851	1840	/* all reset (RST) segments are validated by checking their SEQ-fields,
daniele	29:1a47b7151851	1841	a reset is valid if its sequence number is in the window */
daniele	29:1a47b7151851	1842	if ((long_be(hdr->seq) >= t->rcv_ackd) && (long_be(hdr->seq) <= ((short_be(hdr->rwnd)<<(t->wnd_scale)) + t->rcv_ackd))) {
daniele	29:1a47b7151851	1843	if ((s->state & PICO_SOCKET_STATE_TCP) == PICO_SOCKET_STATE_TCP_SYN_RECV) {
daniele	29:1a47b7151851	1844	/* go to closed */
daniele	29:1a47b7151851	1845	(t->sock).state &= 0x00FFU;
daniele	29:1a47b7151851	1846	(t->sock).state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	1847	(t->sock).state &= 0xFF00U;
daniele	29:1a47b7151851	1848	(t->sock).state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	1849	/* call EV_ERR wakeup */
daniele	29:1a47b7151851	1850	pico_err = PICO_ERR_ECONNRESET;
daniele	29:1a47b7151851	1851	if ((t->sock).wakeup)
daniele	29:1a47b7151851	1852	(t->sock).wakeup(PICO_SOCK_EV_ERR, &(t->sock));
daniele	29:1a47b7151851	1853	tcp_dbg("TCP RST> SOCKET BACK TO LISTEN\n");
daniele	29:1a47b7151851	1854	pico_socket_del(s);
daniele	29:1a47b7151851	1855	} else {
daniele	29:1a47b7151851	1856	/* go to closed */
daniele	29:1a47b7151851	1857	(t->sock).state &= 0x00FFU;
daniele	29:1a47b7151851	1858	(t->sock).state \|= PICO_SOCKET_STATE_TCP_CLOSED;
daniele	29:1a47b7151851	1859	(t->sock).state &= 0xFF00U;
daniele	29:1a47b7151851	1860	(t->sock).state \|= PICO_SOCKET_STATE_CLOSED;
daniele	29:1a47b7151851	1861
daniele	29:1a47b7151851	1862	/* call EV_FIN wakeup before deleting */
daniele	29:1a47b7151851	1863	if ((t->sock).wakeup)
daniele	29:1a47b7151851	1864	(t->sock).wakeup(PICO_SOCK_EV_FIN, &(t->sock));
daniele	29:1a47b7151851	1865	/* call EV_ERR wakeup before deleting */
daniele	29:1a47b7151851	1866	pico_err = PICO_ERR_ECONNRESET;
daniele	29:1a47b7151851	1867	if ((t->sock).wakeup)
daniele	29:1a47b7151851	1868	(t->sock).wakeup(PICO_SOCK_EV_ERR, &(t->sock));
daniele	29:1a47b7151851	1869
daniele	29:1a47b7151851	1870	/* delete socket */
daniele	29:1a47b7151851	1871	pico_socket_del(&t->sock);
daniele	29:1a47b7151851	1872	}
daniele	29:1a47b7151851	1873	} else { /* not valid, ignore */
daniele	29:1a47b7151851	1874	tcp_dbg("TCP RST> IGNORE\n");
daniele	29:1a47b7151851	1875	return 0;
daniele	29:1a47b7151851	1876	}
daniele	29:1a47b7151851	1877	}
daniele	29:1a47b7151851	1878
daniele	29:1a47b7151851	1879	return 0;
daniele	29:1a47b7151851	1880	}
daniele	29:1a47b7151851	1881
daniele	29:1a47b7151851	1882	struct tcp_action_entry {
daniele	29:1a47b7151851	1883	uint16_t tcpstate;
daniele	29:1a47b7151851	1884	int (syn)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1885	int (synack)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1886	int (ack)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1887	int (data)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1888	int (fin)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1889	int (finack)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1890	int (rst)(struct pico_socket s, struct pico_frame *f);
daniele	29:1a47b7151851	1891	};
daniele	29:1a47b7151851	1892
daniele	29:1a47b7151851	1893	static struct tcp_action_entry tcp_fsm[] = {
daniele	29:1a47b7151851	1894	/* State syn synack ack data fin finack rst*/
daniele	29:1a47b7151851	1895	{ PICO_SOCKET_STATE_TCP_UNDEF, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
daniele	29:1a47b7151851	1896	{ PICO_SOCKET_STATE_TCP_CLOSED, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
daniele	29:1a47b7151851	1897	{ PICO_SOCKET_STATE_TCP_LISTEN, &tcp_syn, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, NULL },
daniele	29:1a47b7151851	1898	{ PICO_SOCKET_STATE_TCP_SYN_SENT, &tcp_nosync_rst, &tcp_synack, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_rst },
daniele	29:1a47b7151851	1899	{ PICO_SOCKET_STATE_TCP_SYN_RECV, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_first_ack, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_nosync_rst, &tcp_rst },
daniele	29:1a47b7151851	1900	{ PICO_SOCKET_STATE_TCP_ESTABLISHED, &tcp_send_rst, &tcp_send_rst, &tcp_ack, &tcp_data_in, &tcp_closewait, &tcp_closewait, &tcp_rst },
tass	32:865c101e0874	1901	{ PICO_SOCKET_STATE_TCP_CLOSE_WAIT, &tcp_send_rst, &tcp_send_rst, &tcp_ack, &tcp_send_rst, &tcp_closewait, &tcp_closewait, &tcp_rst },
daniele	29:1a47b7151851	1902	{ PICO_SOCKET_STATE_TCP_LAST_ACK, &tcp_send_rst, &tcp_send_rst, &tcp_lastackwait, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_rst },
daniele	29:1a47b7151851	1903	{ PICO_SOCKET_STATE_TCP_FIN_WAIT1, &tcp_send_rst, &tcp_send_rst, &tcp_finwaitack, &tcp_data_in, &tcp_rcvfin, &tcp_finack, &tcp_rst },
daniele	29:1a47b7151851	1904	{ PICO_SOCKET_STATE_TCP_FIN_WAIT2, &tcp_send_rst, &tcp_send_rst, &tcp_ack, &tcp_data_in, &tcp_finwaitfin, &tcp_finack, &tcp_rst },
daniele	29:1a47b7151851	1905	{ PICO_SOCKET_STATE_TCP_CLOSING, &tcp_send_rst, &tcp_send_rst, &tcp_closewaitack, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_rst },
daniele	29:1a47b7151851	1906	{ PICO_SOCKET_STATE_TCP_TIME_WAIT, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_send_rst, &tcp_rst }
daniele	29:1a47b7151851	1907	};
daniele	29:1a47b7151851	1908
daniele	29:1a47b7151851	1909	/*
daniele	29:1a47b7151851	1910	NOTE: in SYN-RECV receiving syn when cloned by default (see yellow pos-it), should send reset.
daniele	29:1a47b7151851	1911	*/
daniele	29:1a47b7151851	1912
daniele	29:1a47b7151851	1913	int pico_tcp_input(struct pico_socket s, struct pico_frame f)
daniele	29:1a47b7151851	1914	{
daniele	29:1a47b7151851	1915	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr ) (f->transport_hdr);
daniele	29:1a47b7151851	1916	int ret = 0;
daniele	29:1a47b7151851	1917	uint8_t flags = hdr->flags;
daniele	29:1a47b7151851	1918	struct tcp_action_entry *action = &tcp_fsm[s->state >> 8];
daniele	29:1a47b7151851	1919
daniele	29:1a47b7151851	1920	f->payload = (f->transport_hdr + ((hdr->len & 0xf0) >> 2));
daniele	29:1a47b7151851	1921	f->payload_len = f->transport_len - ((hdr->len & 0xf0) >> 2);
daniele	29:1a47b7151851	1922
daniele	29:1a47b7151851	1923	tcp_dbg("[%lu] TCP> [tcp input] socket: %p state: %d <-- local port:%d remote port: %d seq: %08x ack: %08x flags: %02x = t_len: %d, hdr: %u payload: %d\n", pico_tick,
daniele	29:1a47b7151851	1924	s, s->state >> 8, short_be(hdr->trans.dport), short_be(hdr->trans.sport), SEQN(f), ACKN(f), hdr->flags, f->transport_len, (hdr->len & 0xf0) >> 2, f->payload_len );
daniele	29:1a47b7151851	1925
daniele	29:1a47b7151851	1926	/* This copy of the frame has the current socket as owner */
daniele	29:1a47b7151851	1927	f->sock = s;
daniele	29:1a47b7151851	1928
daniele	29:1a47b7151851	1929	/* Those are not supported at this time. */
daniele	29:1a47b7151851	1930	flags &= ~(PICO_TCP_CWR \| PICO_TCP_URG \| PICO_TCP_ECN);
daniele	29:1a47b7151851	1931	if (flags == PICO_TCP_SYN) {
daniele	29:1a47b7151851	1932	if (action->syn)
daniele	29:1a47b7151851	1933	action->syn(s,f);
daniele	29:1a47b7151851	1934	} else if (flags == (PICO_TCP_SYN \| PICO_TCP_ACK)) {
daniele	29:1a47b7151851	1935	if (action->synack)
daniele	29:1a47b7151851	1936	action->synack(s,f);
daniele	29:1a47b7151851	1937	} else {
daniele	29:1a47b7151851	1938	if ((flags == PICO_TCP_ACK) \|\| (flags == (PICO_TCP_ACK \| PICO_TCP_PSH))) {
daniele	29:1a47b7151851	1939	if (action->ack) {
daniele	29:1a47b7151851	1940	action->ack(s,f);
daniele	29:1a47b7151851	1941	}
daniele	29:1a47b7151851	1942	}
daniele	29:1a47b7151851	1943	if (f->payload_len > 0) {
daniele	29:1a47b7151851	1944	ret = f->payload_len;
daniele	29:1a47b7151851	1945	if (action->data)
daniele	29:1a47b7151851	1946	action->data(s,f);
daniele	29:1a47b7151851	1947	}
daniele	29:1a47b7151851	1948	if (flags == PICO_TCP_FIN) {
daniele	29:1a47b7151851	1949	if (action->fin)
daniele	29:1a47b7151851	1950	action->fin(s,f);
daniele	29:1a47b7151851	1951	}
daniele	29:1a47b7151851	1952	if ((flags == (PICO_TCP_FIN \| PICO_TCP_ACK)) \|\| (flags == (PICO_TCP_FIN \| PICO_TCP_ACK \| PICO_TCP_PSH))) {
daniele	29:1a47b7151851	1953	if (action->finack)
daniele	29:1a47b7151851	1954	action->finack(s,f);
daniele	29:1a47b7151851	1955	}
daniele	29:1a47b7151851	1956	if (flags & PICO_TCP_RST) {
daniele	29:1a47b7151851	1957	if (action->rst)
daniele	29:1a47b7151851	1958	action->rst(s,f);
daniele	29:1a47b7151851	1959	}
daniele	29:1a47b7151851	1960	}
daniele	29:1a47b7151851	1961
daniele	29:1a47b7151851	1962	//discard:
daniele	29:1a47b7151851	1963	pico_frame_discard(f);
daniele	29:1a47b7151851	1964	return ret;
daniele	29:1a47b7151851	1965	}
daniele	29:1a47b7151851	1966
daniele	29:1a47b7151851	1967	static void tcp_send_keepalive(unsigned long when, void *_t)
daniele	29:1a47b7151851	1968	{
daniele	29:1a47b7151851	1969	struct pico_socket_tcp t = (struct pico_socket_tcp )_t;
daniele	29:1a47b7151851	1970	tcp_dbg("\n\nSending keepalive (%d), [State = %d]...\n", t->backoff,t->sock.state );
daniele	29:1a47b7151851	1971	if( t->sock.net && ((t->sock.state & 0xFF00) == PICO_SOCKET_STATE_TCP_ESTABLISHED) )
daniele	29:1a47b7151851	1972	{
daniele	29:1a47b7151851	1973	tcp_send_ack(t);
daniele	29:1a47b7151851	1974
daniele	29:1a47b7151851	1975	if (t->keepalive_timer_running > 0) {
daniele	29:1a47b7151851	1976	t->keepalive_timer_running--;
daniele	29:1a47b7151851	1977	}
daniele	29:1a47b7151851	1978
daniele	29:1a47b7151851	1979	if (t->keepalive_timer_running == 0) {
daniele	29:1a47b7151851	1980	t->keepalive_timer_running++;
daniele	29:1a47b7151851	1981	tcp_dbg("[Self] Adding timer(retransmit keepalive)\n");
daniele	29:1a47b7151851	1982	pico_timer_add(t->rto << (++t->backoff), tcp_send_keepalive, t);
daniele	29:1a47b7151851	1983	}
daniele	29:1a47b7151851	1984	}
daniele	29:1a47b7151851	1985	}
daniele	29:1a47b7151851	1986
daniele	29:1a47b7151851	1987	int pico_tcp_output(struct pico_socket *s, int loop_score)
daniele	29:1a47b7151851	1988	{
daniele	29:1a47b7151851	1989	struct pico_socket_tcp t = (struct pico_socket_tcp )s;
daniele	29:1a47b7151851	1990	struct pico_frame f, una;
daniele	29:1a47b7151851	1991	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	1992	int sent = 0;
daniele	29:1a47b7151851	1993
daniele	29:1a47b7151851	1994	una = first_segment(&t->tcpq_out);
daniele	29:1a47b7151851	1995
daniele	29:1a47b7151851	1996	f = peek_segment(&t->tcpq_out, t->snd_nxt);
daniele	29:1a47b7151851	1997	while((f) && (t->cwnd >= t->in_flight)) {
daniele	29:1a47b7151851	1998	hdr = (struct pico_tcp_hdr *)f->transport_hdr;
daniele	29:1a47b7151851	1999	f->timestamp = pico_tick;
daniele	29:1a47b7151851	2000	tcp_add_options(t, f, hdr->flags, tcp_options_size(t, hdr->flags));
daniele	29:1a47b7151851	2001	if (seq_compare(SEQN(f) + f->payload_len, SEQN(una) + (t->recv_wnd << t->recv_wnd_scale)) > 0) {
daniele	29:1a47b7151851	2002	t->cwnd = t->in_flight;
daniele	29:1a47b7151851	2003	if (t->cwnd < 1)
daniele	29:1a47b7151851	2004	t->cwnd = 1;
daniele	29:1a47b7151851	2005	if (t->x_mode != PICO_TCP_WINDOW_FULL) {
daniele	29:1a47b7151851	2006	tcp_dbg("TCP> RIGHT SIZING (rwnd: %d, frame len: %d\n",t->recv_wnd << t->recv_wnd_scale, f->payload_len);
daniele	29:1a47b7151851	2007	tcp_dbg("In window full...\n");
daniele	29:1a47b7151851	2008	t->snd_nxt = SEQN(una);
daniele	29:1a47b7151851	2009
daniele	29:1a47b7151851	2010	/* Alternative to the line above: (better performance, but seems to lock anyway with larger buffers)
daniele	29:1a47b7151851	2011	if (seq_compare(t->snd_nxt, SEQN(una)) > 0)
daniele	29:1a47b7151851	2012	t->snd_nxt -= f->payload_len;
daniele	29:1a47b7151851	2013	*/
daniele	29:1a47b7151851	2014
daniele	29:1a47b7151851	2015	t->x_mode = PICO_TCP_WINDOW_FULL;
daniele	29:1a47b7151851	2016	if (t->keepalive_timer_running == 0) {
daniele	29:1a47b7151851	2017	tcp_dbg("[Window full] Adding timer(send keepalive)\n");
daniele	29:1a47b7151851	2018	tcp_send_keepalive(0, t);
daniele	29:1a47b7151851	2019	}
daniele	29:1a47b7151851	2020	}
daniele	29:1a47b7151851	2021	break;
daniele	29:1a47b7151851	2022	}
daniele	29:1a47b7151851	2023	tcp_dbg("TCP> DEQUEUED (for output) frame %08x, acks %08x len= %d, remaining frames %d\n", SEQN(f), ACKN(f), f->payload_len,t->tcpq_out.frames);
daniele	29:1a47b7151851	2024	tcp_send(t, f);
daniele	29:1a47b7151851	2025	sent++;
daniele	29:1a47b7151851	2026	loop_score--;
daniele	29:1a47b7151851	2027	t->snd_last_out = SEQN(f);
daniele	29:1a47b7151851	2028	if (loop_score < 1)
daniele	29:1a47b7151851	2029	break;
daniele	29:1a47b7151851	2030	if (f->payload_len > 0) {
daniele	29:1a47b7151851	2031	f = next_segment(&t->tcpq_out, f);
daniele	29:1a47b7151851	2032	} else {
daniele	29:1a47b7151851	2033	f = NULL;
daniele	29:1a47b7151851	2034	}
daniele	29:1a47b7151851	2035	}
daniele	29:1a47b7151851	2036	if (sent > 0) {
daniele	29:1a47b7151851	2037	if (t->rto < PICO_TCP_RTO_MIN)
daniele	29:1a47b7151851	2038	t->rto = PICO_TCP_RTO_MIN;
daniele	29:1a47b7151851	2039	add_retransmission_timer(t, pico_tick + t->rto);
daniele	29:1a47b7151851	2040	} else {
daniele	29:1a47b7151851	2041	// no packets in queue ??
daniele	29:1a47b7151851	2042	}
daniele	29:1a47b7151851	2043
daniele	29:1a47b7151851	2044	if ((t->tcpq_out.frames == 0) && (s->state & PICO_SOCKET_STATE_SHUT_LOCAL)) { /* if no more packets in queue, XXX replacled !f by tcpq check */
daniele	29:1a47b7151851	2045	if ((s->state & PICO_SOCKET_STATE_TCP) == PICO_SOCKET_STATE_TCP_ESTABLISHED) {
daniele	29:1a47b7151851	2046	tcp_dbg("TCP> buffer empty, shutdown established ...\n");
daniele	29:1a47b7151851	2047	/* send fin if queue empty and in state shut local (write) */
daniele	29:1a47b7151851	2048	tcp_send_fin(t);
daniele	29:1a47b7151851	2049	/* change tcp state to FIN_WAIT1 */
daniele	29:1a47b7151851	2050	s->state &= 0x00FFU;
daniele	29:1a47b7151851	2051	s->state \|= PICO_SOCKET_STATE_TCP_FIN_WAIT1;
daniele	29:1a47b7151851	2052	} else if ((s->state & PICO_SOCKET_STATE_TCP) == PICO_SOCKET_STATE_TCP_CLOSE_WAIT) {
daniele	29:1a47b7151851	2053	/* send fin if queue empty and in state shut local (write) */
daniele	29:1a47b7151851	2054	tcp_send_fin(t);
daniele	29:1a47b7151851	2055	/* change tcp state to LAST_ACK */
daniele	29:1a47b7151851	2056	s->state &= 0x00FFU;
daniele	29:1a47b7151851	2057	s->state \|= PICO_SOCKET_STATE_TCP_LAST_ACK;
daniele	29:1a47b7151851	2058	tcp_dbg("TCP> STATE: LAST_ACK.\n");
daniele	29:1a47b7151851	2059	}
daniele	29:1a47b7151851	2060	}
daniele	29:1a47b7151851	2061	return loop_score;
daniele	29:1a47b7151851	2062	}
daniele	29:1a47b7151851	2063
daniele	29:1a47b7151851	2064	/* function to make new segment from hold queue with specific size (mss) */
daniele	29:1a47b7151851	2065	static struct pico_frame * pico_hold_segment_make(struct pico_socket_tcp *t)
daniele	29:1a47b7151851	2066	{
daniele	29:1a47b7151851	2067	struct pico_frame f_temp,f_new;
daniele	29:1a47b7151851	2068	struct pico_socket s = (struct pico_socket ) &t->sock;
daniele	29:1a47b7151851	2069	struct pico_tcp_hdr *hdr;
daniele	29:1a47b7151851	2070	int total_len = 0, total_payload_len = 0;
daniele	29:1a47b7151851	2071	int off = 0, test = 0;
daniele	29:1a47b7151851	2072
daniele	29:1a47b7151851	2073	off = pico_tcp_overhead(s);
daniele	29:1a47b7151851	2074
daniele	29:1a47b7151851	2075	/* init with first frame in hold queue */
daniele	29:1a47b7151851	2076	f_temp = first_segment(&t->tcpq_hold);
daniele	29:1a47b7151851	2077	total_len = f_temp->payload_len;
daniele	29:1a47b7151851	2078	f_temp = next_segment(&t->tcpq_hold, f_temp);
daniele	29:1a47b7151851	2079
daniele	29:1a47b7151851	2080	/* check till total_len <= MSS */
daniele	29:1a47b7151851	2081	while ((f_temp != NULL) && ((total_len+f_temp->payload_len) <= PICO_TCP_DEFAULT_MSS)) {
daniele	29:1a47b7151851	2082	total_len += f_temp->payload_len;
daniele	29:1a47b7151851	2083	f_temp = next_segment(&t->tcpq_hold, f_temp);
daniele	29:1a47b7151851	2084	if (f_temp == NULL)
daniele	29:1a47b7151851	2085	break;
daniele	29:1a47b7151851	2086	}
daniele	29:1a47b7151851	2087	/* alloc new frame with payload size = off + total_len */
daniele	29:1a47b7151851	2088	f_new = pico_socket_frame_alloc(s, off + total_len);
daniele	29:1a47b7151851	2089	if (!f_new) {
daniele	29:1a47b7151851	2090	pico_err = PICO_ERR_ENOMEM;
daniele	29:1a47b7151851	2091	return f_new;
daniele	29:1a47b7151851	2092	}
daniele	29:1a47b7151851	2093
daniele	29:1a47b7151851	2094	hdr = (struct pico_tcp_hdr *) f_new->transport_hdr;
daniele	29:1a47b7151851	2095	/* init new frame */
daniele	29:1a47b7151851	2096	f_new->payload += off;
daniele	29:1a47b7151851	2097	f_new->payload_len -= off;
daniele	29:1a47b7151851	2098	f_new->sock = s;
daniele	29:1a47b7151851	2099
daniele	29:1a47b7151851	2100	f_temp = first_segment(&t->tcpq_hold);
daniele	29:1a47b7151851	2101	hdr->seq = ((struct pico_tcp_hdr )(f_temp->transport_hdr))->seq; / get sequence number of first frame */
daniele	29:1a47b7151851	2102	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	2103	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	2104
daniele	29:1a47b7151851	2105	/* check till total_payload_len <= MSS */
daniele	29:1a47b7151851	2106	while ((f_temp != NULL) && ((total_payload_len + f_temp->payload_len) <= PICO_TCP_DEFAULT_MSS)) {
daniele	29:1a47b7151851	2107	/* cpy data and discard frame */
daniele	29:1a47b7151851	2108	test++;
daniele	29:1a47b7151851	2109	memcpy(f_new->payload + total_payload_len, f_temp->payload, f_temp->payload_len);
daniele	29:1a47b7151851	2110	total_payload_len += f_temp->payload_len;
daniele	29:1a47b7151851	2111	pico_discard_segment(&t->tcpq_hold, f_temp);
daniele	29:1a47b7151851	2112	f_temp = first_segment(&t->tcpq_hold);
daniele	29:1a47b7151851	2113	}
daniele	29:1a47b7151851	2114
daniele	29:1a47b7151851	2115	hdr->len = (f_new->payload - f_new->transport_hdr) << 2 \| t->jumbo;
daniele	29:1a47b7151851	2116
daniele	29:1a47b7151851	2117	tcp_dbg("NAGLE make - joined %d segments, len %d bytes\n",test,total_payload_len);
daniele	29:1a47b7151851	2118
daniele	29:1a47b7151851	2119	return f_new;
daniele	29:1a47b7151851	2120	}
daniele	29:1a47b7151851	2121
daniele	29:1a47b7151851	2122	/* original behavior kept when Nagle disabled;
daniele	29:1a47b7151851	2123	Nagle algorithm added here, keeping hold frame queue instead of eg linked list of data */
daniele	29:1a47b7151851	2124	int pico_tcp_push(struct pico_protocol self, struct pico_frame f)
daniele	29:1a47b7151851	2125	{
daniele	29:1a47b7151851	2126	struct pico_tcp_hdr hdr = (struct pico_tcp_hdr )f->transport_hdr;
daniele	29:1a47b7151851	2127	struct pico_socket_tcp t = (struct pico_socket_tcp ) f->sock;
daniele	29:1a47b7151851	2128	struct pico_frame *f_new;
daniele	29:1a47b7151851	2129	int total_len = 0;
daniele	29:1a47b7151851	2130
daniele	29:1a47b7151851	2131	hdr->trans.sport = t->sock.local_port;
daniele	29:1a47b7151851	2132	hdr->trans.dport = t->sock.remote_port;
daniele	29:1a47b7151851	2133	hdr->seq = long_be(t->snd_last + 1);
daniele	29:1a47b7151851	2134	hdr->len = (f->payload - f->transport_hdr) << 2 \| t->jumbo;
daniele	29:1a47b7151851	2135
daniele	29:1a47b7151851	2136	if (f->payload_len > (t->tcpq_out.max_size - t->tcpq_out.size))
daniele	29:1a47b7151851	2137	t->sock.ev_pending &= (~PICO_SOCK_EV_WR);
daniele	29:1a47b7151851	2138
daniele	29:1a47b7151851	2139	/***************************************************************************/
daniele	29:1a47b7151851	2140
daniele	29:1a47b7151851	2141	if (!IS_NAGLE_ENABLED((&(t->sock)))) {
daniele	29:1a47b7151851	2142	/* TCP_NODELAY enabled, original behavior */
daniele	29:1a47b7151851	2143	if (pico_enqueue_segment(&t->tcpq_out,f) > 0) {
daniele	29:1a47b7151851	2144	tcp_dbg("TCP_PUSH - NO NAGLE - Pushing segment %08x, len %08x to socket %p\n", t->snd_last + 1, f->payload_len, t);
daniele	29:1a47b7151851	2145	t->snd_last += f->payload_len;
daniele	29:1a47b7151851	2146	return f->payload_len;
daniele	29:1a47b7151851	2147	} else {
daniele	29:1a47b7151851	2148	tcp_dbg("Enqueue failed.\n");
daniele	29:1a47b7151851	2149	return 0;
daniele	29:1a47b7151851	2150	}
daniele	29:1a47b7151851	2151	}
daniele	29:1a47b7151851	2152	/***************************************************************************/
daniele	29:1a47b7151851	2153	else {
daniele	29:1a47b7151851	2154	/* Nagle's algorithm enabled, check if ready to send, or put frame in hold queue */
daniele	29:1a47b7151851	2155	if (IS_TCP_IDLE(t) && IS_TCP_HOLDQ_EMPTY(t)) { /* opt 1. send frame */
daniele	29:1a47b7151851	2156	if (pico_enqueue_segment(&t->tcpq_out,f) > 0) {
daniele	29:1a47b7151851	2157	tcp_dbg("TCP_PUSH - NAGLE - Pushing segment %08x, len %08x to socket %p\n", t->snd_last + 1, f->payload_len, t);
daniele	29:1a47b7151851	2158	t->snd_last += f->payload_len;
daniele	29:1a47b7151851	2159	return f->payload_len;
daniele	29:1a47b7151851	2160	} else {
daniele	29:1a47b7151851	2161	tcp_dbg("Enqueue failed.\n");
daniele	29:1a47b7151851	2162	return 0;
daniele	29:1a47b7151851	2163	}
daniele	29:1a47b7151851	2164	} else { /* opt 2. hold data back */
daniele	29:1a47b7151851	2165	total_len = f->payload_len + t->tcpq_hold.size;
daniele	29:1a47b7151851	2166	if ((total_len >= PICO_TCP_DEFAULT_MSS) && ((t->tcpq_out.max_size - t->tcpq_out.size) >= PICO_TCP_DEFAULT_MSS)) {/* TODO check mss socket */
daniele	29:1a47b7151851	2167	/* IF enough data in hold (>mss) AND space in out queue (>mss) */
daniele	29:1a47b7151851	2168	/* add current frame in hold and make new segment */
daniele	29:1a47b7151851	2169	if (pico_enqueue_segment(&t->tcpq_hold,f) > 0 ) {
daniele	29:1a47b7151851	2170	tcp_dbg("TCP_PUSH - NAGLE - Pushed into hold, make new (enqueued frames out %d)\n",t->tcpq_out.frames);
daniele	29:1a47b7151851	2171	t->snd_last += f->payload_len; /* XXX WATCH OUT */
daniele	29:1a47b7151851	2172	f_new = pico_hold_segment_make(t);
daniele	29:1a47b7151851	2173	} else {
daniele	29:1a47b7151851	2174	tcp_dbg("TCP_PUSH - NAGLE - enqueue hold failed 1\n");
daniele	29:1a47b7151851	2175	return 0;
daniele	29:1a47b7151851	2176	}
daniele	29:1a47b7151851	2177	/* and put new frame in out queue */
daniele	29:1a47b7151851	2178	if ((f_new != NULL) && (pico_enqueue_segment(&t->tcpq_out,f_new) > 0)) {
daniele	29:1a47b7151851	2179	return f_new->payload_len;
daniele	29:1a47b7151851	2180	} else {
daniele	29:1a47b7151851	2181	tcp_dbg("TCP_PUSH - NAGLE - enqueue out failed, f_new = %p\n",f_new);
daniele	29:1a47b7151851	2182	return -1; /* XXX something seriously wrong */
daniele	29:1a47b7151851	2183	}
daniele	29:1a47b7151851	2184	} else {
daniele	29:1a47b7151851	2185	/* ELSE put frame in hold queue */
daniele	29:1a47b7151851	2186	if (pico_enqueue_segment(&t->tcpq_hold,f) > 0) {
daniele	29:1a47b7151851	2187	tcp_dbg("TCP_PUSH - NAGLE - Pushed into hold (enqueued frames out %d)\n",t->tcpq_out.frames);
daniele	29:1a47b7151851	2188	t->snd_last += f->payload_len; /* XXX WATCH OUT */
daniele	29:1a47b7151851	2189	return f->payload_len;
daniele	29:1a47b7151851	2190	} else {
daniele	29:1a47b7151851	2191	tcp_dbg("TCP_PUSH - NAGLE - enqueue hold failed 2\n");
daniele	29:1a47b7151851	2192	return 0;
daniele	29:1a47b7151851	2193	}
daniele	29:1a47b7151851	2194	}
daniele	29:1a47b7151851	2195	}
daniele	29:1a47b7151851	2196	}
daniele	29:1a47b7151851	2197	/***************************************************************************/
daniele	29:1a47b7151851	2198	}
daniele	29:1a47b7151851	2199	#endif //PICO_SUPPORT_TCP