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ip.h
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1 /**
2  * @file
3  * IP API
4  */
5 
6 /*
7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  * derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * This file is part of the lwIP TCP/IP stack.
33  *
34  * Author: Adam Dunkels <adam@sics.se>
35  *
36  */
37 #ifndef LWIP_HDR_IP_H
38 #define LWIP_HDR_IP_H
39 
40 #include "lwip/opt.h"
41 
42 #include "lwip/def.h"
43 #include "lwip/pbuf.h"
44 #include "lwip/ip_addr.h"
45 #include "lwip/err.h"
46 #include "lwip/netif.h"
47 #include "lwip/ip4.h"
48 #include "lwip/ip6.h"
49 #include "lwip/prot/ip.h"
50 
51 #ifdef __cplusplus
52 extern "C" {
53 #endif
54 
55 /* This is passed as the destination address to ip_output_if (not
56  to ip_output), meaning that an IP header already is constructed
57  in the pbuf. This is used when TCP retransmits. */
58 #define LWIP_IP_HDRINCL NULL
59 
60 /** pbufs passed to IP must have a ref-count of 1 as their payload pointer
61  gets altered as the packet is passed down the stack */
62 #ifndef LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX
63 #define LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p) LWIP_ASSERT("p->ref == 1", (p)->ref == 1)
64 #endif
65 
66 #if LWIP_NETIF_USE_HINTS
67 #define IP_PCB_NETIFHINT ;struct netif_hint netif_hints
68 #else /* LWIP_NETIF_USE_HINTS */
69 #define IP_PCB_NETIFHINT
70 #endif /* LWIP_NETIF_USE_HINTS */
71 
72 /** This is the common part of all PCB types. It needs to be at the
73  beginning of a PCB type definition. It is located here so that
74  changes to this common part are made in one location instead of
75  having to change all PCB structs. */
76 #define IP_PCB \
77  /* ip addresses in network byte order */ \
78  ip_addr_t local_ip; \
79  ip_addr_t remote_ip; \
80  /* Bound netif index */ \
81  u8_t netif_idx; \
82  /* Socket options */ \
83  u8_t so_options; \
84  /* Type Of Service */ \
85  u8_t tos; \
86  /* Time To Live */ \
87  u8_t ttl \
88  /* link layer address resolution hint */ \
89  IP_PCB_NETIFHINT
90 
91 struct ip_pcb {
92  /* Common members of all PCB types */
93  IP_PCB;
94 };
95 
96 /*
97  * Option flags per-socket. These are the same like SO_XXX in sockets.h
98  */
99 #define SOF_REUSEADDR 0x04U /* allow local address reuse */
100 #define SOF_KEEPALIVE 0x08U /* keep connections alive */
101 #define SOF_BROADCAST 0x20U /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
102 
103 /* These flags are inherited (e.g. from a listen-pcb to a connection-pcb): */
104 #define SOF_INHERITED (SOF_REUSEADDR|SOF_KEEPALIVE)
105 
106 /** Global variables of this module, kept in a struct for efficient access using base+index. */
107 struct ip_globals
108 {
109  /** The interface that accepted the packet for the current callback invocation. */
110  struct netif *current_netif;
111  /** The interface that received the packet for the current callback invocation. */
112  struct netif *current_input_netif;
113 #if LWIP_IPV4
114  /** Header of the input packet currently being processed. */
115  const struct ip_hdr *current_ip4_header;
116 #endif /* LWIP_IPV4 */
117 #if LWIP_IPV6
118  /** Header of the input IPv6 packet currently being processed. */
119  struct ip6_hdr *current_ip6_header;
120 #endif /* LWIP_IPV6 */
121  /** Total header length of current_ip4/6_header (i.e. after this, the UDP/TCP header starts) */
122  u16_t current_ip_header_tot_len;
123  /** Source IP address of current_header */
124  ip_addr_t current_iphdr_src;
125  /** Destination IP address of current_header */
126  ip_addr_t current_iphdr_dest;
127 };
128 extern struct ip_globals ip_data;
129 
130 
131 /** Get the interface that accepted the current packet.
132  * This may or may not be the receiving netif, depending on your netif/network setup.
133  * This function must only be called from a receive callback (udp_recv,
134  * raw_recv, tcp_accept). It will return NULL otherwise. */
135 #define ip_current_netif() (ip_data.current_netif)
136 /** Get the interface that received the current packet.
137  * This function must only be called from a receive callback (udp_recv,
138  * raw_recv, tcp_accept). It will return NULL otherwise. */
139 #define ip_current_input_netif() (ip_data.current_input_netif)
140 /** Total header length of ip(6)_current_header() (i.e. after this, the UDP/TCP header starts) */
141 #define ip_current_header_tot_len() (ip_data.current_ip_header_tot_len)
142 /** Source IP address of current_header */
143 #define ip_current_src_addr() (&ip_data.current_iphdr_src)
144 /** Destination IP address of current_header */
145 #define ip_current_dest_addr() (&ip_data.current_iphdr_dest)
146 
147 #if LWIP_IPV4 && LWIP_IPV6
148 /** Get the IPv4 header of the current packet.
149  * This function must only be called from a receive callback (udp_recv,
150  * raw_recv, tcp_accept). It will return NULL otherwise. */
151 #define ip4_current_header() ip_data.current_ip4_header
152 /** Get the IPv6 header of the current packet.
153  * This function must only be called from a receive callback (udp_recv,
154  * raw_recv, tcp_accept). It will return NULL otherwise. */
155 #define ip6_current_header() ((const struct ip6_hdr*)(ip_data.current_ip6_header))
156 /** Returns TRUE if the current IP input packet is IPv6, FALSE if it is IPv4 */
157 #define ip_current_is_v6() (ip6_current_header() != NULL)
158 /** Source IPv6 address of current_header */
159 #define ip6_current_src_addr() (ip_2_ip6(&ip_data.current_iphdr_src))
160 /** Destination IPv6 address of current_header */
161 #define ip6_current_dest_addr() (ip_2_ip6(&ip_data.current_iphdr_dest))
162 /** Get the transport layer protocol */
163 #define ip_current_header_proto() (ip_current_is_v6() ? \
164  IP6H_NEXTH(ip6_current_header()) :\
165  IPH_PROTO(ip4_current_header()))
166 /** Get the transport layer header */
167 #define ip_next_header_ptr() ((const void*)((ip_current_is_v6() ? \
168  (const u8_t*)ip6_current_header() : (const u8_t*)ip4_current_header()) + ip_current_header_tot_len()))
169 
170 /** Source IP4 address of current_header */
171 #define ip4_current_src_addr() (ip_2_ip4(&ip_data.current_iphdr_src))
172 /** Destination IP4 address of current_header */
173 #define ip4_current_dest_addr() (ip_2_ip4(&ip_data.current_iphdr_dest))
174 
175 #elif LWIP_IPV4 /* LWIP_IPV4 && LWIP_IPV6 */
176 
177 /** Get the IPv4 header of the current packet.
178  * This function must only be called from a receive callback (udp_recv,
179  * raw_recv, tcp_accept). It will return NULL otherwise. */
180 #define ip4_current_header() ip_data.current_ip4_header
181 /** Always returns FALSE when only supporting IPv4 only */
182 #define ip_current_is_v6() 0
183 /** Get the transport layer protocol */
184 #define ip_current_header_proto() IPH_PROTO(ip4_current_header())
185 /** Get the transport layer header */
186 #define ip_next_header_ptr() ((const void*)((const u8_t*)ip4_current_header() + ip_current_header_tot_len()))
187 /** Source IP4 address of current_header */
188 #define ip4_current_src_addr() (&ip_data.current_iphdr_src)
189 /** Destination IP4 address of current_header */
190 #define ip4_current_dest_addr() (&ip_data.current_iphdr_dest)
191 
192 #elif LWIP_IPV6 /* LWIP_IPV4 && LWIP_IPV6 */
193 
194 /** Get the IPv6 header of the current packet.
195  * This function must only be called from a receive callback (udp_recv,
196  * raw_recv, tcp_accept). It will return NULL otherwise. */
197 #define ip6_current_header() ((const struct ip6_hdr*)(ip_data.current_ip6_header))
198 /** Always returns TRUE when only supporting IPv6 only */
199 #define ip_current_is_v6() 1
200 /** Get the transport layer protocol */
201 #define ip_current_header_proto() IP6H_NEXTH(ip6_current_header())
202 /** Get the transport layer header */
203 #define ip_next_header_ptr() ((const void*)(((const u8_t*)ip6_current_header()) + ip_current_header_tot_len()))
204 /** Source IP6 address of current_header */
205 #define ip6_current_src_addr() (&ip_data.current_iphdr_src)
206 /** Destination IP6 address of current_header */
207 #define ip6_current_dest_addr() (&ip_data.current_iphdr_dest)
208 
209 #endif /* LWIP_IPV6 */
210 
211 /** Union source address of current_header */
212 #define ip_current_src_addr() (&ip_data.current_iphdr_src)
213 /** Union destination address of current_header */
214 #define ip_current_dest_addr() (&ip_data.current_iphdr_dest)
215 
216 /** Gets an IP pcb option (SOF_* flags) */
217 #define ip_get_option(pcb, opt) ((pcb)->so_options & (opt))
218 /** Sets an IP pcb option (SOF_* flags) */
219 #define ip_set_option(pcb, opt) ((pcb)->so_options = (u8_t)((pcb)->so_options | (opt)))
220 /** Resets an IP pcb option (SOF_* flags) */
221 #define ip_reset_option(pcb, opt) ((pcb)->so_options = (u8_t)((pcb)->so_options & ~(opt)))
222 
223 #if LWIP_IPV4 && LWIP_IPV6
224 /**
225  * @ingroup ip
226  * Output IP packet, netif is selected by source address
227  */
228 #define ip_output(p, src, dest, ttl, tos, proto) \
229  (IP_IS_V6(dest) ? \
230  ip6_output(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto) : \
231  ip4_output(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto))
232 /**
233  * @ingroup ip
234  * Output IP packet to specified interface
235  */
236 #define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
237  (IP_IS_V6(dest) ? \
238  ip6_output_if(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif) : \
239  ip4_output_if(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif))
240 /**
241  * @ingroup ip
242  * Output IP packet to interface specifying source address
243  */
244 #define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
245  (IP_IS_V6(dest) ? \
246  ip6_output_if_src(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif) : \
247  ip4_output_if_src(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif))
248 /** Output IP packet that already includes an IP header. */
249 #define ip_output_if_hdrincl(p, src, dest, netif) \
250  (IP_IS_V6(dest) ? \
251  ip6_output_if(p, ip_2_ip6(src), LWIP_IP_HDRINCL, 0, 0, 0, netif) : \
252  ip4_output_if(p, ip_2_ip4(src), LWIP_IP_HDRINCL, 0, 0, 0, netif))
253 /** Output IP packet with netif_hint */
254 #define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
255  (IP_IS_V6(dest) ? \
256  ip6_output_hinted(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif_hint) : \
257  ip4_output_hinted(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif_hint))
258 /**
259  * @ingroup ip
260  * Get netif for address combination. See \ref ip6_route and \ref ip4_route
261  */
262 #define ip_route(src, dest) \
263  (IP_IS_V6(dest) ? \
264  ip6_route(ip_2_ip6(src), ip_2_ip6(dest)) : \
265  ip4_route_src(ip_2_ip4(src), ip_2_ip4(dest)))
266 /**
267  * @ingroup ip
268  * Get netif for IP.
269  */
270 #define ip_netif_get_local_ip(netif, dest) (IP_IS_V6(dest) ? \
271  ip6_netif_get_local_ip(netif, ip_2_ip6(dest)) : \
272  ip4_netif_get_local_ip(netif))
273 #define ip_debug_print(is_ipv6, p) ((is_ipv6) ? ip6_debug_print(p) : ip4_debug_print(p))
274 
275 err_t ip_input(struct pbuf *p, struct netif *inp);
276 
277 #elif LWIP_IPV4 /* LWIP_IPV4 && LWIP_IPV6 */
278 
279 #define ip_output(p, src, dest, ttl, tos, proto) \
280  ip4_output(p, src, dest, ttl, tos, proto)
281 #define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
282  ip4_output_if(p, src, dest, ttl, tos, proto, netif)
283 #define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
284  ip4_output_if_src(p, src, dest, ttl, tos, proto, netif)
285 #define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
286  ip4_output_hinted(p, src, dest, ttl, tos, proto, netif_hint)
287 #define ip_output_if_hdrincl(p, src, dest, netif) \
288  ip4_output_if(p, src, LWIP_IP_HDRINCL, 0, 0, 0, netif)
289 #define ip_route(src, dest) \
290  ip4_route_src(src, dest)
291 #define ip_netif_get_local_ip(netif, dest) \
292  ip4_netif_get_local_ip(netif)
293 #define ip_debug_print(is_ipv6, p) ip4_debug_print(p)
294 
295 #define ip_input ip4_input
296 
297 #elif LWIP_IPV6 /* LWIP_IPV4 && LWIP_IPV6 */
298 
299 #define ip_output(p, src, dest, ttl, tos, proto) \
300  ip6_output(p, src, dest, ttl, tos, proto)
301 #define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
302  ip6_output_if(p, src, dest, ttl, tos, proto, netif)
303 #define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
304  ip6_output_if_src(p, src, dest, ttl, tos, proto, netif)
305 #define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
306  ip6_output_hinted(p, src, dest, ttl, tos, proto, netif_hint)
307 #define ip_output_if_hdrincl(p, src, dest, netif) \
308  ip6_output_if(p, src, LWIP_IP_HDRINCL, 0, 0, 0, netif)
309 #define ip_route(src, dest) \
310  ip6_route(src, dest)
311 #define ip_netif_get_local_ip(netif, dest) \
312  ip6_netif_get_local_ip(netif, dest)
313 #define ip_debug_print(is_ipv6, p) ip6_debug_print(p)
314 
315 #define ip_input ip6_input
316 
317 #endif /* LWIP_IPV6 */
318 
319 #define ip_route_get_local_ip(src, dest, netif, ipaddr) do { \
320  (netif) = ip_route(src, dest); \
321  (ipaddr) = ip_netif_get_local_ip(netif, dest); \
322 }while(0)
323 
324 #ifdef __cplusplus
325 }
326 #endif
327 
328 #endif /* LWIP_HDR_IP_H */
329 
330 
def.h
various utility macros
ip6.h
IPv6 layer.
ip.h
IP protocol definitions.
ip_globals::current_iphdr_dest
ip_addr_t current_iphdr_dest
Destination IP address of current_header.
Definition: ip.h:126
IP_PCB
#define IP_PCB
This is the common part of all PCB types.
Definition: ip.h:76
opt.h
lwIP Options Configuration
ip_globals::current_ip_header_tot_len
u16_t current_ip_header_tot_len
Total header length of current_ip4/6_header (i.e.
Definition: ip.h:122
ip_globals::current_iphdr_src
ip_addr_t current_iphdr_src
Source IP address of current_header.
Definition: ip.h:124
ip_globals::current_netif
struct netif * current_netif
The interface that accepted the packet for the current callback invocation.
Definition: ip.h:110
netif.h
netif API (to be used from TCPIP thread)
pbuf
Main packet buffer struct.
Definition: ppp_service_if.h:136
err.h
lwIP Error codes
netif
Generic data structure used for all lwIP network interfaces.
Definition: ppp_service_if.h:157
ip_globals
Global variables of this module, kept in a struct for efficient access using base+index.
Definition: ip.h:107
pbuf.h
pbuf API
ip_hdr
Definition: prot/ip4.h:73
nsapi_addr
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:237
ip_addr.h
IP address API (common IPv4 and IPv6)
ip_globals::current_input_netif
struct netif * current_input_netif
The interface that received the packet for the current callback invocation.
Definition: ip.h:112
ip6_hdr
The IPv6 header.
Definition: prot/ip6.h:80
ip_pcb
Definition: ip.h:91
ip4.h
IPv4 API.
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