wip
Dependents: EthernetInterface_vz
Fork of lwip by
netif/etharp.c@30:cb9095482c25, 2015-04-07 (annotated)
- Committer:
- klauss
- Date:
- Tue Apr 07 14:27:01 2015 +0000
- Revision:
- 30:cb9095482c25
- Parent:
- 0:51ac1d130fd4
wip
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 0:51ac1d130fd4 | 1 | /** |
mbed_official | 0:51ac1d130fd4 | 2 | * @file |
mbed_official | 0:51ac1d130fd4 | 3 | * Address Resolution Protocol module for IP over Ethernet |
mbed_official | 0:51ac1d130fd4 | 4 | * |
mbed_official | 0:51ac1d130fd4 | 5 | * Functionally, ARP is divided into two parts. The first maps an IP address |
mbed_official | 0:51ac1d130fd4 | 6 | * to a physical address when sending a packet, and the second part answers |
mbed_official | 0:51ac1d130fd4 | 7 | * requests from other machines for our physical address. |
mbed_official | 0:51ac1d130fd4 | 8 | * |
mbed_official | 0:51ac1d130fd4 | 9 | * This implementation complies with RFC 826 (Ethernet ARP). It supports |
mbed_official | 0:51ac1d130fd4 | 10 | * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6 |
mbed_official | 0:51ac1d130fd4 | 11 | * if an interface calls etharp_gratuitous(our_netif) upon address change. |
mbed_official | 0:51ac1d130fd4 | 12 | */ |
mbed_official | 0:51ac1d130fd4 | 13 | |
mbed_official | 0:51ac1d130fd4 | 14 | /* |
mbed_official | 0:51ac1d130fd4 | 15 | * Copyright (c) 2001-2003 Swedish Institute of Computer Science. |
mbed_official | 0:51ac1d130fd4 | 16 | * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv> |
mbed_official | 0:51ac1d130fd4 | 17 | * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands. |
mbed_official | 0:51ac1d130fd4 | 18 | * All rights reserved. |
mbed_official | 0:51ac1d130fd4 | 19 | * |
mbed_official | 0:51ac1d130fd4 | 20 | * Redistribution and use in source and binary forms, with or without modification, |
mbed_official | 0:51ac1d130fd4 | 21 | * are permitted provided that the following conditions are met: |
mbed_official | 0:51ac1d130fd4 | 22 | * |
mbed_official | 0:51ac1d130fd4 | 23 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 0:51ac1d130fd4 | 24 | * this list of conditions and the following disclaimer. |
mbed_official | 0:51ac1d130fd4 | 25 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 0:51ac1d130fd4 | 26 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 0:51ac1d130fd4 | 27 | * and/or other materials provided with the distribution. |
mbed_official | 0:51ac1d130fd4 | 28 | * 3. The name of the author may not be used to endorse or promote products |
mbed_official | 0:51ac1d130fd4 | 29 | * derived from this software without specific prior written permission. |
mbed_official | 0:51ac1d130fd4 | 30 | * |
mbed_official | 0:51ac1d130fd4 | 31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
mbed_official | 0:51ac1d130fd4 | 32 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
mbed_official | 0:51ac1d130fd4 | 33 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
mbed_official | 0:51ac1d130fd4 | 34 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
mbed_official | 0:51ac1d130fd4 | 35 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
mbed_official | 0:51ac1d130fd4 | 36 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
mbed_official | 0:51ac1d130fd4 | 37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
mbed_official | 0:51ac1d130fd4 | 38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
mbed_official | 0:51ac1d130fd4 | 39 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
mbed_official | 0:51ac1d130fd4 | 40 | * OF SUCH DAMAGE. |
mbed_official | 0:51ac1d130fd4 | 41 | * |
mbed_official | 0:51ac1d130fd4 | 42 | * This file is part of the lwIP TCP/IP stack. |
mbed_official | 0:51ac1d130fd4 | 43 | * |
mbed_official | 0:51ac1d130fd4 | 44 | */ |
mbed_official | 0:51ac1d130fd4 | 45 | |
mbed_official | 0:51ac1d130fd4 | 46 | #include "lwip/opt.h" |
mbed_official | 0:51ac1d130fd4 | 47 | |
mbed_official | 0:51ac1d130fd4 | 48 | #if LWIP_ARP || LWIP_ETHERNET |
mbed_official | 0:51ac1d130fd4 | 49 | |
mbed_official | 0:51ac1d130fd4 | 50 | #include "lwip/ip_addr.h" |
mbed_official | 0:51ac1d130fd4 | 51 | #include "lwip/def.h" |
mbed_official | 0:51ac1d130fd4 | 52 | #include "lwip/ip.h" |
mbed_official | 0:51ac1d130fd4 | 53 | #include "lwip/stats.h" |
mbed_official | 0:51ac1d130fd4 | 54 | #include "lwip/snmp.h" |
mbed_official | 0:51ac1d130fd4 | 55 | #include "lwip/dhcp.h" |
mbed_official | 0:51ac1d130fd4 | 56 | #include "lwip/autoip.h" |
mbed_official | 0:51ac1d130fd4 | 57 | #include "netif/etharp.h" |
mbed_official | 0:51ac1d130fd4 | 58 | |
mbed_official | 0:51ac1d130fd4 | 59 | #if PPPOE_SUPPORT |
mbed_official | 0:51ac1d130fd4 | 60 | #include "netif/ppp_oe.h" |
mbed_official | 0:51ac1d130fd4 | 61 | #endif /* PPPOE_SUPPORT */ |
mbed_official | 0:51ac1d130fd4 | 62 | |
mbed_official | 0:51ac1d130fd4 | 63 | #include <string.h> |
mbed_official | 0:51ac1d130fd4 | 64 | |
mbed_official | 0:51ac1d130fd4 | 65 | const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}}; |
mbed_official | 0:51ac1d130fd4 | 66 | const struct eth_addr ethzero = {{0,0,0,0,0,0}}; |
mbed_official | 0:51ac1d130fd4 | 67 | |
mbed_official | 0:51ac1d130fd4 | 68 | #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */ |
mbed_official | 0:51ac1d130fd4 | 69 | |
mbed_official | 0:51ac1d130fd4 | 70 | /** the time an ARP entry stays valid after its last update, |
mbed_official | 0:51ac1d130fd4 | 71 | * for ARP_TMR_INTERVAL = 5000, this is |
mbed_official | 0:51ac1d130fd4 | 72 | * (240 * 5) seconds = 20 minutes. |
mbed_official | 0:51ac1d130fd4 | 73 | */ |
mbed_official | 0:51ac1d130fd4 | 74 | #define ARP_MAXAGE 240 |
mbed_official | 0:51ac1d130fd4 | 75 | /** the time an ARP entry stays pending after first request, |
mbed_official | 0:51ac1d130fd4 | 76 | * for ARP_TMR_INTERVAL = 5000, this is |
mbed_official | 0:51ac1d130fd4 | 77 | * (2 * 5) seconds = 10 seconds. |
mbed_official | 0:51ac1d130fd4 | 78 | * |
mbed_official | 0:51ac1d130fd4 | 79 | * @internal Keep this number at least 2, otherwise it might |
mbed_official | 0:51ac1d130fd4 | 80 | * run out instantly if the timeout occurs directly after a request. |
mbed_official | 0:51ac1d130fd4 | 81 | */ |
mbed_official | 0:51ac1d130fd4 | 82 | #define ARP_MAXPENDING 2 |
mbed_official | 0:51ac1d130fd4 | 83 | |
mbed_official | 0:51ac1d130fd4 | 84 | #define HWTYPE_ETHERNET 1 |
mbed_official | 0:51ac1d130fd4 | 85 | |
mbed_official | 0:51ac1d130fd4 | 86 | enum etharp_state { |
mbed_official | 0:51ac1d130fd4 | 87 | ETHARP_STATE_EMPTY = 0, |
mbed_official | 0:51ac1d130fd4 | 88 | ETHARP_STATE_PENDING, |
mbed_official | 0:51ac1d130fd4 | 89 | ETHARP_STATE_STABLE |
mbed_official | 0:51ac1d130fd4 | 90 | }; |
mbed_official | 0:51ac1d130fd4 | 91 | |
mbed_official | 0:51ac1d130fd4 | 92 | struct etharp_entry { |
mbed_official | 0:51ac1d130fd4 | 93 | #if ARP_QUEUEING |
mbed_official | 0:51ac1d130fd4 | 94 | /** Pointer to queue of pending outgoing packets on this ARP entry. */ |
mbed_official | 0:51ac1d130fd4 | 95 | struct etharp_q_entry *q; |
mbed_official | 0:51ac1d130fd4 | 96 | #else /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 97 | /** Pointer to a single pending outgoing packet on this ARP entry. */ |
mbed_official | 0:51ac1d130fd4 | 98 | struct pbuf *q; |
mbed_official | 0:51ac1d130fd4 | 99 | #endif /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 100 | ip_addr_t ipaddr; |
mbed_official | 0:51ac1d130fd4 | 101 | struct eth_addr ethaddr; |
mbed_official | 0:51ac1d130fd4 | 102 | #if LWIP_SNMP |
mbed_official | 0:51ac1d130fd4 | 103 | struct netif *netif; |
mbed_official | 0:51ac1d130fd4 | 104 | #endif /* LWIP_SNMP */ |
mbed_official | 0:51ac1d130fd4 | 105 | u8_t state; |
mbed_official | 0:51ac1d130fd4 | 106 | u8_t ctime; |
mbed_official | 0:51ac1d130fd4 | 107 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 108 | u8_t static_entry; |
mbed_official | 0:51ac1d130fd4 | 109 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 110 | }; |
mbed_official | 0:51ac1d130fd4 | 111 | |
mbed_official | 0:51ac1d130fd4 | 112 | static struct etharp_entry arp_table[ARP_TABLE_SIZE]; |
mbed_official | 0:51ac1d130fd4 | 113 | |
mbed_official | 0:51ac1d130fd4 | 114 | #if !LWIP_NETIF_HWADDRHINT |
mbed_official | 0:51ac1d130fd4 | 115 | static u8_t etharp_cached_entry; |
mbed_official | 0:51ac1d130fd4 | 116 | #endif /* !LWIP_NETIF_HWADDRHINT */ |
mbed_official | 0:51ac1d130fd4 | 117 | |
mbed_official | 0:51ac1d130fd4 | 118 | /** Try hard to create a new entry - we want the IP address to appear in |
mbed_official | 0:51ac1d130fd4 | 119 | the cache (even if this means removing an active entry or so). */ |
mbed_official | 0:51ac1d130fd4 | 120 | #define ETHARP_FLAG_TRY_HARD 1 |
mbed_official | 0:51ac1d130fd4 | 121 | #define ETHARP_FLAG_FIND_ONLY 2 |
mbed_official | 0:51ac1d130fd4 | 122 | #define ETHARP_FLAG_STATIC_ENTRY 4 |
mbed_official | 0:51ac1d130fd4 | 123 | |
mbed_official | 0:51ac1d130fd4 | 124 | #if LWIP_NETIF_HWADDRHINT |
mbed_official | 0:51ac1d130fd4 | 125 | #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \ |
mbed_official | 0:51ac1d130fd4 | 126 | *((netif)->addr_hint) = (hint); |
mbed_official | 0:51ac1d130fd4 | 127 | #else /* LWIP_NETIF_HWADDRHINT */ |
mbed_official | 0:51ac1d130fd4 | 128 | #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint)) |
mbed_official | 0:51ac1d130fd4 | 129 | #endif /* LWIP_NETIF_HWADDRHINT */ |
mbed_official | 0:51ac1d130fd4 | 130 | |
mbed_official | 0:51ac1d130fd4 | 131 | static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags); |
mbed_official | 0:51ac1d130fd4 | 132 | |
mbed_official | 0:51ac1d130fd4 | 133 | |
mbed_official | 0:51ac1d130fd4 | 134 | /* Some checks, instead of etharp_init(): */ |
mbed_official | 0:51ac1d130fd4 | 135 | #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f)) |
mbed_official | 0:51ac1d130fd4 | 136 | #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h" |
mbed_official | 0:51ac1d130fd4 | 137 | #endif |
mbed_official | 0:51ac1d130fd4 | 138 | |
mbed_official | 0:51ac1d130fd4 | 139 | |
mbed_official | 0:51ac1d130fd4 | 140 | #if ARP_QUEUEING |
mbed_official | 0:51ac1d130fd4 | 141 | /** |
mbed_official | 0:51ac1d130fd4 | 142 | * Free a complete queue of etharp entries |
mbed_official | 0:51ac1d130fd4 | 143 | * |
mbed_official | 0:51ac1d130fd4 | 144 | * @param q a qeueue of etharp_q_entry's to free |
mbed_official | 0:51ac1d130fd4 | 145 | */ |
mbed_official | 0:51ac1d130fd4 | 146 | static void |
mbed_official | 0:51ac1d130fd4 | 147 | free_etharp_q(struct etharp_q_entry *q) |
mbed_official | 0:51ac1d130fd4 | 148 | { |
mbed_official | 0:51ac1d130fd4 | 149 | struct etharp_q_entry *r; |
mbed_official | 0:51ac1d130fd4 | 150 | LWIP_ASSERT("q != NULL", q != NULL); |
mbed_official | 0:51ac1d130fd4 | 151 | LWIP_ASSERT("q->p != NULL", q->p != NULL); |
mbed_official | 0:51ac1d130fd4 | 152 | while (q) { |
mbed_official | 0:51ac1d130fd4 | 153 | r = q; |
mbed_official | 0:51ac1d130fd4 | 154 | q = q->next; |
mbed_official | 0:51ac1d130fd4 | 155 | LWIP_ASSERT("r->p != NULL", (r->p != NULL)); |
mbed_official | 0:51ac1d130fd4 | 156 | pbuf_free(r->p); |
mbed_official | 0:51ac1d130fd4 | 157 | memp_free(MEMP_ARP_QUEUE, r); |
mbed_official | 0:51ac1d130fd4 | 158 | } |
mbed_official | 0:51ac1d130fd4 | 159 | } |
mbed_official | 0:51ac1d130fd4 | 160 | #else /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 161 | |
mbed_official | 0:51ac1d130fd4 | 162 | /** Compatibility define: free the queued pbuf */ |
mbed_official | 0:51ac1d130fd4 | 163 | #define free_etharp_q(q) pbuf_free(q) |
mbed_official | 0:51ac1d130fd4 | 164 | |
mbed_official | 0:51ac1d130fd4 | 165 | #endif /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 166 | |
mbed_official | 0:51ac1d130fd4 | 167 | /** Clean up ARP table entries */ |
mbed_official | 0:51ac1d130fd4 | 168 | static void |
mbed_official | 0:51ac1d130fd4 | 169 | free_entry(int i) |
mbed_official | 0:51ac1d130fd4 | 170 | { |
mbed_official | 0:51ac1d130fd4 | 171 | /* remove from SNMP ARP index tree */ |
mbed_official | 0:51ac1d130fd4 | 172 | snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr); |
mbed_official | 0:51ac1d130fd4 | 173 | /* and empty packet queue */ |
mbed_official | 0:51ac1d130fd4 | 174 | if (arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 175 | /* remove all queued packets */ |
mbed_official | 0:51ac1d130fd4 | 176 | LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q))); |
mbed_official | 0:51ac1d130fd4 | 177 | free_etharp_q(arp_table[i].q); |
mbed_official | 0:51ac1d130fd4 | 178 | arp_table[i].q = NULL; |
mbed_official | 0:51ac1d130fd4 | 179 | } |
mbed_official | 0:51ac1d130fd4 | 180 | /* recycle entry for re-use */ |
mbed_official | 0:51ac1d130fd4 | 181 | arp_table[i].state = ETHARP_STATE_EMPTY; |
mbed_official | 0:51ac1d130fd4 | 182 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 183 | arp_table[i].static_entry = 0; |
mbed_official | 0:51ac1d130fd4 | 184 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 185 | #ifdef LWIP_DEBUG |
mbed_official | 0:51ac1d130fd4 | 186 | /* for debugging, clean out the complete entry */ |
mbed_official | 0:51ac1d130fd4 | 187 | arp_table[i].ctime = 0; |
mbed_official | 0:51ac1d130fd4 | 188 | #if LWIP_SNMP |
mbed_official | 0:51ac1d130fd4 | 189 | arp_table[i].netif = NULL; |
mbed_official | 0:51ac1d130fd4 | 190 | #endif /* LWIP_SNMP */ |
mbed_official | 0:51ac1d130fd4 | 191 | ip_addr_set_zero(&arp_table[i].ipaddr); |
mbed_official | 0:51ac1d130fd4 | 192 | arp_table[i].ethaddr = ethzero; |
mbed_official | 0:51ac1d130fd4 | 193 | #endif /* LWIP_DEBUG */ |
mbed_official | 0:51ac1d130fd4 | 194 | } |
mbed_official | 0:51ac1d130fd4 | 195 | |
mbed_official | 0:51ac1d130fd4 | 196 | /** |
mbed_official | 0:51ac1d130fd4 | 197 | * Clears expired entries in the ARP table. |
mbed_official | 0:51ac1d130fd4 | 198 | * |
mbed_official | 0:51ac1d130fd4 | 199 | * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds), |
mbed_official | 0:51ac1d130fd4 | 200 | * in order to expire entries in the ARP table. |
mbed_official | 0:51ac1d130fd4 | 201 | */ |
mbed_official | 0:51ac1d130fd4 | 202 | void |
mbed_official | 0:51ac1d130fd4 | 203 | etharp_tmr(void) |
mbed_official | 0:51ac1d130fd4 | 204 | { |
mbed_official | 0:51ac1d130fd4 | 205 | u8_t i; |
mbed_official | 0:51ac1d130fd4 | 206 | |
mbed_official | 0:51ac1d130fd4 | 207 | LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n")); |
mbed_official | 0:51ac1d130fd4 | 208 | /* remove expired entries from the ARP table */ |
mbed_official | 0:51ac1d130fd4 | 209 | for (i = 0; i < ARP_TABLE_SIZE; ++i) { |
mbed_official | 0:51ac1d130fd4 | 210 | u8_t state = arp_table[i].state; |
mbed_official | 0:51ac1d130fd4 | 211 | if (state != ETHARP_STATE_EMPTY |
mbed_official | 0:51ac1d130fd4 | 212 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 213 | && (arp_table[i].static_entry == 0) |
mbed_official | 0:51ac1d130fd4 | 214 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 215 | ) { |
mbed_official | 0:51ac1d130fd4 | 216 | arp_table[i].ctime++; |
mbed_official | 0:51ac1d130fd4 | 217 | if ((arp_table[i].ctime >= ARP_MAXAGE) || |
mbed_official | 0:51ac1d130fd4 | 218 | ((arp_table[i].state == ETHARP_STATE_PENDING) && |
mbed_official | 0:51ac1d130fd4 | 219 | (arp_table[i].ctime >= ARP_MAXPENDING))) { |
mbed_official | 0:51ac1d130fd4 | 220 | /* pending or stable entry has become old! */ |
mbed_official | 0:51ac1d130fd4 | 221 | LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n", |
mbed_official | 0:51ac1d130fd4 | 222 | arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 223 | /* clean up entries that have just been expired */ |
mbed_official | 0:51ac1d130fd4 | 224 | free_entry(i); |
mbed_official | 0:51ac1d130fd4 | 225 | } |
mbed_official | 0:51ac1d130fd4 | 226 | #if ARP_QUEUEING |
mbed_official | 0:51ac1d130fd4 | 227 | /* still pending entry? (not expired) */ |
mbed_official | 0:51ac1d130fd4 | 228 | if (arp_table[i].state == ETHARP_STATE_PENDING) { |
mbed_official | 0:51ac1d130fd4 | 229 | /* resend an ARP query here? */ |
mbed_official | 0:51ac1d130fd4 | 230 | } |
mbed_official | 0:51ac1d130fd4 | 231 | #endif /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 232 | } |
mbed_official | 0:51ac1d130fd4 | 233 | } |
mbed_official | 0:51ac1d130fd4 | 234 | } |
mbed_official | 0:51ac1d130fd4 | 235 | |
mbed_official | 0:51ac1d130fd4 | 236 | /** |
mbed_official | 0:51ac1d130fd4 | 237 | * Search the ARP table for a matching or new entry. |
mbed_official | 0:51ac1d130fd4 | 238 | * |
mbed_official | 0:51ac1d130fd4 | 239 | * If an IP address is given, return a pending or stable ARP entry that matches |
mbed_official | 0:51ac1d130fd4 | 240 | * the address. If no match is found, create a new entry with this address set, |
mbed_official | 0:51ac1d130fd4 | 241 | * but in state ETHARP_EMPTY. The caller must check and possibly change the |
mbed_official | 0:51ac1d130fd4 | 242 | * state of the returned entry. |
mbed_official | 0:51ac1d130fd4 | 243 | * |
mbed_official | 0:51ac1d130fd4 | 244 | * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY. |
mbed_official | 0:51ac1d130fd4 | 245 | * |
mbed_official | 0:51ac1d130fd4 | 246 | * In all cases, attempt to create new entries from an empty entry. If no |
mbed_official | 0:51ac1d130fd4 | 247 | * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle |
mbed_official | 0:51ac1d130fd4 | 248 | * old entries. Heuristic choose the least important entry for recycling. |
mbed_official | 0:51ac1d130fd4 | 249 | * |
mbed_official | 0:51ac1d130fd4 | 250 | * @param ipaddr IP address to find in ARP cache, or to add if not found. |
mbed_official | 0:51ac1d130fd4 | 251 | * @param flags @see definition of ETHARP_FLAG_* |
mbed_official | 0:51ac1d130fd4 | 252 | * @param netif netif related to this address (used for NETIF_HWADDRHINT) |
mbed_official | 0:51ac1d130fd4 | 253 | * |
mbed_official | 0:51ac1d130fd4 | 254 | * @return The ARP entry index that matched or is created, ERR_MEM if no |
mbed_official | 0:51ac1d130fd4 | 255 | * entry is found or could be recycled. |
mbed_official | 0:51ac1d130fd4 | 256 | */ |
mbed_official | 0:51ac1d130fd4 | 257 | static s8_t |
mbed_official | 0:51ac1d130fd4 | 258 | find_entry(ip_addr_t *ipaddr, u8_t flags) |
mbed_official | 0:51ac1d130fd4 | 259 | { |
mbed_official | 0:51ac1d130fd4 | 260 | s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE; |
mbed_official | 0:51ac1d130fd4 | 261 | s8_t empty = ARP_TABLE_SIZE; |
mbed_official | 0:51ac1d130fd4 | 262 | u8_t i = 0, age_pending = 0, age_stable = 0; |
mbed_official | 0:51ac1d130fd4 | 263 | /* oldest entry with packets on queue */ |
mbed_official | 0:51ac1d130fd4 | 264 | s8_t old_queue = ARP_TABLE_SIZE; |
mbed_official | 0:51ac1d130fd4 | 265 | /* its age */ |
mbed_official | 0:51ac1d130fd4 | 266 | u8_t age_queue = 0; |
mbed_official | 0:51ac1d130fd4 | 267 | |
mbed_official | 0:51ac1d130fd4 | 268 | /** |
mbed_official | 0:51ac1d130fd4 | 269 | * a) do a search through the cache, remember candidates |
mbed_official | 0:51ac1d130fd4 | 270 | * b) select candidate entry |
mbed_official | 0:51ac1d130fd4 | 271 | * c) create new entry |
mbed_official | 0:51ac1d130fd4 | 272 | */ |
mbed_official | 0:51ac1d130fd4 | 273 | |
mbed_official | 0:51ac1d130fd4 | 274 | /* a) in a single search sweep, do all of this |
mbed_official | 0:51ac1d130fd4 | 275 | * 1) remember the first empty entry (if any) |
mbed_official | 0:51ac1d130fd4 | 276 | * 2) remember the oldest stable entry (if any) |
mbed_official | 0:51ac1d130fd4 | 277 | * 3) remember the oldest pending entry without queued packets (if any) |
mbed_official | 0:51ac1d130fd4 | 278 | * 4) remember the oldest pending entry with queued packets (if any) |
mbed_official | 0:51ac1d130fd4 | 279 | * 5) search for a matching IP entry, either pending or stable |
mbed_official | 0:51ac1d130fd4 | 280 | * until 5 matches, or all entries are searched for. |
mbed_official | 0:51ac1d130fd4 | 281 | */ |
mbed_official | 0:51ac1d130fd4 | 282 | |
mbed_official | 0:51ac1d130fd4 | 283 | for (i = 0; i < ARP_TABLE_SIZE; ++i) { |
mbed_official | 0:51ac1d130fd4 | 284 | u8_t state = arp_table[i].state; |
mbed_official | 0:51ac1d130fd4 | 285 | /* no empty entry found yet and now we do find one? */ |
mbed_official | 0:51ac1d130fd4 | 286 | if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) { |
mbed_official | 0:51ac1d130fd4 | 287 | LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 288 | /* remember first empty entry */ |
mbed_official | 0:51ac1d130fd4 | 289 | empty = i; |
mbed_official | 0:51ac1d130fd4 | 290 | } else if (state != ETHARP_STATE_EMPTY) { |
mbed_official | 0:51ac1d130fd4 | 291 | LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE", |
mbed_official | 0:51ac1d130fd4 | 292 | state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE); |
mbed_official | 0:51ac1d130fd4 | 293 | /* if given, does IP address match IP address in ARP entry? */ |
mbed_official | 0:51ac1d130fd4 | 294 | if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { |
mbed_official | 0:51ac1d130fd4 | 295 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 296 | /* found exact IP address match, simply bail out */ |
mbed_official | 0:51ac1d130fd4 | 297 | return i; |
mbed_official | 0:51ac1d130fd4 | 298 | } |
mbed_official | 0:51ac1d130fd4 | 299 | /* pending entry? */ |
mbed_official | 0:51ac1d130fd4 | 300 | if (state == ETHARP_STATE_PENDING) { |
mbed_official | 0:51ac1d130fd4 | 301 | /* pending with queued packets? */ |
mbed_official | 0:51ac1d130fd4 | 302 | if (arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 303 | if (arp_table[i].ctime >= age_queue) { |
mbed_official | 0:51ac1d130fd4 | 304 | old_queue = i; |
mbed_official | 0:51ac1d130fd4 | 305 | age_queue = arp_table[i].ctime; |
mbed_official | 0:51ac1d130fd4 | 306 | } |
mbed_official | 0:51ac1d130fd4 | 307 | } else |
mbed_official | 0:51ac1d130fd4 | 308 | /* pending without queued packets? */ |
mbed_official | 0:51ac1d130fd4 | 309 | { |
mbed_official | 0:51ac1d130fd4 | 310 | if (arp_table[i].ctime >= age_pending) { |
mbed_official | 0:51ac1d130fd4 | 311 | old_pending = i; |
mbed_official | 0:51ac1d130fd4 | 312 | age_pending = arp_table[i].ctime; |
mbed_official | 0:51ac1d130fd4 | 313 | } |
mbed_official | 0:51ac1d130fd4 | 314 | } |
mbed_official | 0:51ac1d130fd4 | 315 | /* stable entry? */ |
mbed_official | 0:51ac1d130fd4 | 316 | } else if (state == ETHARP_STATE_STABLE) { |
mbed_official | 0:51ac1d130fd4 | 317 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 318 | /* don't record old_stable for static entries since they never expire */ |
mbed_official | 0:51ac1d130fd4 | 319 | if (arp_table[i].static_entry == 0) |
mbed_official | 0:51ac1d130fd4 | 320 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 321 | { |
mbed_official | 0:51ac1d130fd4 | 322 | /* remember entry with oldest stable entry in oldest, its age in maxtime */ |
mbed_official | 0:51ac1d130fd4 | 323 | if (arp_table[i].ctime >= age_stable) { |
mbed_official | 0:51ac1d130fd4 | 324 | old_stable = i; |
mbed_official | 0:51ac1d130fd4 | 325 | age_stable = arp_table[i].ctime; |
mbed_official | 0:51ac1d130fd4 | 326 | } |
mbed_official | 0:51ac1d130fd4 | 327 | } |
mbed_official | 0:51ac1d130fd4 | 328 | } |
mbed_official | 0:51ac1d130fd4 | 329 | } |
mbed_official | 0:51ac1d130fd4 | 330 | } |
mbed_official | 0:51ac1d130fd4 | 331 | /* { we have no match } => try to create a new entry */ |
mbed_official | 0:51ac1d130fd4 | 332 | |
mbed_official | 0:51ac1d130fd4 | 333 | /* don't create new entry, only search? */ |
mbed_official | 0:51ac1d130fd4 | 334 | if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) || |
mbed_official | 0:51ac1d130fd4 | 335 | /* or no empty entry found and not allowed to recycle? */ |
mbed_official | 0:51ac1d130fd4 | 336 | ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) { |
mbed_official | 0:51ac1d130fd4 | 337 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n")); |
mbed_official | 0:51ac1d130fd4 | 338 | return (s8_t)ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 339 | } |
mbed_official | 0:51ac1d130fd4 | 340 | |
mbed_official | 0:51ac1d130fd4 | 341 | /* b) choose the least destructive entry to recycle: |
mbed_official | 0:51ac1d130fd4 | 342 | * 1) empty entry |
mbed_official | 0:51ac1d130fd4 | 343 | * 2) oldest stable entry |
mbed_official | 0:51ac1d130fd4 | 344 | * 3) oldest pending entry without queued packets |
mbed_official | 0:51ac1d130fd4 | 345 | * 4) oldest pending entry with queued packets |
mbed_official | 0:51ac1d130fd4 | 346 | * |
mbed_official | 0:51ac1d130fd4 | 347 | * { ETHARP_FLAG_TRY_HARD is set at this point } |
mbed_official | 0:51ac1d130fd4 | 348 | */ |
mbed_official | 0:51ac1d130fd4 | 349 | |
mbed_official | 0:51ac1d130fd4 | 350 | /* 1) empty entry available? */ |
mbed_official | 0:51ac1d130fd4 | 351 | if (empty < ARP_TABLE_SIZE) { |
mbed_official | 0:51ac1d130fd4 | 352 | i = empty; |
mbed_official | 0:51ac1d130fd4 | 353 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 354 | } else { |
mbed_official | 0:51ac1d130fd4 | 355 | /* 2) found recyclable stable entry? */ |
mbed_official | 0:51ac1d130fd4 | 356 | if (old_stable < ARP_TABLE_SIZE) { |
mbed_official | 0:51ac1d130fd4 | 357 | /* recycle oldest stable*/ |
mbed_official | 0:51ac1d130fd4 | 358 | i = old_stable; |
mbed_official | 0:51ac1d130fd4 | 359 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 360 | /* no queued packets should exist on stable entries */ |
mbed_official | 0:51ac1d130fd4 | 361 | LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL); |
mbed_official | 0:51ac1d130fd4 | 362 | /* 3) found recyclable pending entry without queued packets? */ |
mbed_official | 0:51ac1d130fd4 | 363 | } else if (old_pending < ARP_TABLE_SIZE) { |
mbed_official | 0:51ac1d130fd4 | 364 | /* recycle oldest pending */ |
mbed_official | 0:51ac1d130fd4 | 365 | i = old_pending; |
mbed_official | 0:51ac1d130fd4 | 366 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 367 | /* 4) found recyclable pending entry with queued packets? */ |
mbed_official | 0:51ac1d130fd4 | 368 | } else if (old_queue < ARP_TABLE_SIZE) { |
mbed_official | 0:51ac1d130fd4 | 369 | /* recycle oldest pending (queued packets are free in free_entry) */ |
mbed_official | 0:51ac1d130fd4 | 370 | i = old_queue; |
mbed_official | 0:51ac1d130fd4 | 371 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q))); |
mbed_official | 0:51ac1d130fd4 | 372 | /* no empty or recyclable entries found */ |
mbed_official | 0:51ac1d130fd4 | 373 | } else { |
mbed_official | 0:51ac1d130fd4 | 374 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n")); |
mbed_official | 0:51ac1d130fd4 | 375 | return (s8_t)ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 376 | } |
mbed_official | 0:51ac1d130fd4 | 377 | |
mbed_official | 0:51ac1d130fd4 | 378 | /* { empty or recyclable entry found } */ |
mbed_official | 0:51ac1d130fd4 | 379 | LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE); |
mbed_official | 0:51ac1d130fd4 | 380 | free_entry(i); |
mbed_official | 0:51ac1d130fd4 | 381 | } |
mbed_official | 0:51ac1d130fd4 | 382 | |
mbed_official | 0:51ac1d130fd4 | 383 | LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE); |
mbed_official | 0:51ac1d130fd4 | 384 | LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY", |
mbed_official | 0:51ac1d130fd4 | 385 | arp_table[i].state == ETHARP_STATE_EMPTY); |
mbed_official | 0:51ac1d130fd4 | 386 | |
mbed_official | 0:51ac1d130fd4 | 387 | /* IP address given? */ |
mbed_official | 0:51ac1d130fd4 | 388 | if (ipaddr != NULL) { |
mbed_official | 0:51ac1d130fd4 | 389 | /* set IP address */ |
mbed_official | 0:51ac1d130fd4 | 390 | ip_addr_copy(arp_table[i].ipaddr, *ipaddr); |
mbed_official | 0:51ac1d130fd4 | 391 | } |
mbed_official | 0:51ac1d130fd4 | 392 | arp_table[i].ctime = 0; |
mbed_official | 0:51ac1d130fd4 | 393 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 394 | arp_table[i].static_entry = 0; |
mbed_official | 0:51ac1d130fd4 | 395 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 396 | return (err_t)i; |
mbed_official | 0:51ac1d130fd4 | 397 | } |
mbed_official | 0:51ac1d130fd4 | 398 | |
mbed_official | 0:51ac1d130fd4 | 399 | /** |
mbed_official | 0:51ac1d130fd4 | 400 | * Send an IP packet on the network using netif->linkoutput |
mbed_official | 0:51ac1d130fd4 | 401 | * The ethernet header is filled in before sending. |
mbed_official | 0:51ac1d130fd4 | 402 | * |
mbed_official | 0:51ac1d130fd4 | 403 | * @params netif the lwIP network interface on which to send the packet |
mbed_official | 0:51ac1d130fd4 | 404 | * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header |
mbed_official | 0:51ac1d130fd4 | 405 | * @params src the source MAC address to be copied into the ethernet header |
mbed_official | 0:51ac1d130fd4 | 406 | * @params dst the destination MAC address to be copied into the ethernet header |
mbed_official | 0:51ac1d130fd4 | 407 | * @return ERR_OK if the packet was sent, any other err_t on failure |
mbed_official | 0:51ac1d130fd4 | 408 | */ |
mbed_official | 0:51ac1d130fd4 | 409 | static err_t |
mbed_official | 0:51ac1d130fd4 | 410 | etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst) |
mbed_official | 0:51ac1d130fd4 | 411 | { |
mbed_official | 0:51ac1d130fd4 | 412 | struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload; |
mbed_official | 0:51ac1d130fd4 | 413 | |
mbed_official | 0:51ac1d130fd4 | 414 | LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!", |
mbed_official | 0:51ac1d130fd4 | 415 | (netif->hwaddr_len == ETHARP_HWADDR_LEN)); |
mbed_official | 0:51ac1d130fd4 | 416 | ETHADDR32_COPY(ðhdr->dest, dst); |
mbed_official | 0:51ac1d130fd4 | 417 | ETHADDR16_COPY(ðhdr->src, src); |
mbed_official | 0:51ac1d130fd4 | 418 | ethhdr->type = PP_HTONS(ETHTYPE_IP); |
mbed_official | 0:51ac1d130fd4 | 419 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p)); |
mbed_official | 0:51ac1d130fd4 | 420 | /* send the packet */ |
mbed_official | 0:51ac1d130fd4 | 421 | return netif->linkoutput(netif, p); |
mbed_official | 0:51ac1d130fd4 | 422 | } |
mbed_official | 0:51ac1d130fd4 | 423 | |
mbed_official | 0:51ac1d130fd4 | 424 | /** |
mbed_official | 0:51ac1d130fd4 | 425 | * Update (or insert) a IP/MAC address pair in the ARP cache. |
mbed_official | 0:51ac1d130fd4 | 426 | * |
mbed_official | 0:51ac1d130fd4 | 427 | * If a pending entry is resolved, any queued packets will be sent |
mbed_official | 0:51ac1d130fd4 | 428 | * at this point. |
mbed_official | 0:51ac1d130fd4 | 429 | * |
mbed_official | 0:51ac1d130fd4 | 430 | * @param netif netif related to this entry (used for NETIF_ADDRHINT) |
mbed_official | 0:51ac1d130fd4 | 431 | * @param ipaddr IP address of the inserted ARP entry. |
mbed_official | 0:51ac1d130fd4 | 432 | * @param ethaddr Ethernet address of the inserted ARP entry. |
mbed_official | 0:51ac1d130fd4 | 433 | * @param flags @see definition of ETHARP_FLAG_* |
mbed_official | 0:51ac1d130fd4 | 434 | * |
mbed_official | 0:51ac1d130fd4 | 435 | * @return |
mbed_official | 0:51ac1d130fd4 | 436 | * - ERR_OK Succesfully updated ARP cache. |
mbed_official | 0:51ac1d130fd4 | 437 | * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set. |
mbed_official | 0:51ac1d130fd4 | 438 | * - ERR_ARG Non-unicast address given, those will not appear in ARP cache. |
mbed_official | 0:51ac1d130fd4 | 439 | * |
mbed_official | 0:51ac1d130fd4 | 440 | * @see pbuf_free() |
mbed_official | 0:51ac1d130fd4 | 441 | */ |
mbed_official | 0:51ac1d130fd4 | 442 | static err_t |
mbed_official | 0:51ac1d130fd4 | 443 | update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags) |
mbed_official | 0:51ac1d130fd4 | 444 | { |
mbed_official | 0:51ac1d130fd4 | 445 | s8_t i; |
mbed_official | 0:51ac1d130fd4 | 446 | LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN); |
mbed_official | 0:51ac1d130fd4 | 447 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n", |
mbed_official | 0:51ac1d130fd4 | 448 | ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr), |
mbed_official | 0:51ac1d130fd4 | 449 | ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2], |
mbed_official | 0:51ac1d130fd4 | 450 | ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5])); |
mbed_official | 0:51ac1d130fd4 | 451 | /* non-unicast address? */ |
mbed_official | 0:51ac1d130fd4 | 452 | if (ip_addr_isany(ipaddr) || |
mbed_official | 0:51ac1d130fd4 | 453 | ip_addr_isbroadcast(ipaddr, netif) || |
mbed_official | 0:51ac1d130fd4 | 454 | ip_addr_ismulticast(ipaddr)) { |
mbed_official | 0:51ac1d130fd4 | 455 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n")); |
mbed_official | 0:51ac1d130fd4 | 456 | return ERR_ARG; |
mbed_official | 0:51ac1d130fd4 | 457 | } |
mbed_official | 0:51ac1d130fd4 | 458 | /* find or create ARP entry */ |
mbed_official | 0:51ac1d130fd4 | 459 | i = find_entry(ipaddr, flags); |
mbed_official | 0:51ac1d130fd4 | 460 | /* bail out if no entry could be found */ |
mbed_official | 0:51ac1d130fd4 | 461 | if (i < 0) { |
mbed_official | 0:51ac1d130fd4 | 462 | return (err_t)i; |
mbed_official | 0:51ac1d130fd4 | 463 | } |
mbed_official | 0:51ac1d130fd4 | 464 | |
mbed_official | 0:51ac1d130fd4 | 465 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 466 | if (flags & ETHARP_FLAG_STATIC_ENTRY) { |
mbed_official | 0:51ac1d130fd4 | 467 | /* record static type */ |
mbed_official | 0:51ac1d130fd4 | 468 | arp_table[i].static_entry = 1; |
mbed_official | 0:51ac1d130fd4 | 469 | } |
mbed_official | 0:51ac1d130fd4 | 470 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 471 | |
mbed_official | 0:51ac1d130fd4 | 472 | /* mark it stable */ |
mbed_official | 0:51ac1d130fd4 | 473 | arp_table[i].state = ETHARP_STATE_STABLE; |
mbed_official | 0:51ac1d130fd4 | 474 | |
mbed_official | 0:51ac1d130fd4 | 475 | #if LWIP_SNMP |
mbed_official | 0:51ac1d130fd4 | 476 | /* record network interface */ |
mbed_official | 0:51ac1d130fd4 | 477 | arp_table[i].netif = netif; |
mbed_official | 0:51ac1d130fd4 | 478 | #endif /* LWIP_SNMP */ |
mbed_official | 0:51ac1d130fd4 | 479 | /* insert in SNMP ARP index tree */ |
mbed_official | 0:51ac1d130fd4 | 480 | snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr); |
mbed_official | 0:51ac1d130fd4 | 481 | |
mbed_official | 0:51ac1d130fd4 | 482 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 483 | /* update address */ |
mbed_official | 0:51ac1d130fd4 | 484 | ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr); |
mbed_official | 0:51ac1d130fd4 | 485 | /* reset time stamp */ |
mbed_official | 0:51ac1d130fd4 | 486 | arp_table[i].ctime = 0; |
mbed_official | 0:51ac1d130fd4 | 487 | /* this is where we will send out queued packets! */ |
mbed_official | 0:51ac1d130fd4 | 488 | #if ARP_QUEUEING |
mbed_official | 0:51ac1d130fd4 | 489 | while (arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 490 | struct pbuf *p; |
mbed_official | 0:51ac1d130fd4 | 491 | /* remember remainder of queue */ |
mbed_official | 0:51ac1d130fd4 | 492 | struct etharp_q_entry *q = arp_table[i].q; |
mbed_official | 0:51ac1d130fd4 | 493 | /* pop first item off the queue */ |
mbed_official | 0:51ac1d130fd4 | 494 | arp_table[i].q = q->next; |
mbed_official | 0:51ac1d130fd4 | 495 | /* get the packet pointer */ |
mbed_official | 0:51ac1d130fd4 | 496 | p = q->p; |
mbed_official | 0:51ac1d130fd4 | 497 | /* now queue entry can be freed */ |
mbed_official | 0:51ac1d130fd4 | 498 | memp_free(MEMP_ARP_QUEUE, q); |
mbed_official | 0:51ac1d130fd4 | 499 | #else /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 500 | if (arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 501 | struct pbuf *p = arp_table[i].q; |
mbed_official | 0:51ac1d130fd4 | 502 | arp_table[i].q = NULL; |
mbed_official | 0:51ac1d130fd4 | 503 | #endif /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 504 | /* send the queued IP packet */ |
mbed_official | 0:51ac1d130fd4 | 505 | etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr); |
mbed_official | 0:51ac1d130fd4 | 506 | /* free the queued IP packet */ |
mbed_official | 0:51ac1d130fd4 | 507 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 508 | } |
mbed_official | 0:51ac1d130fd4 | 509 | return ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 510 | } |
mbed_official | 0:51ac1d130fd4 | 511 | |
mbed_official | 0:51ac1d130fd4 | 512 | #if ETHARP_SUPPORT_STATIC_ENTRIES |
mbed_official | 0:51ac1d130fd4 | 513 | /** Add a new static entry to the ARP table. If an entry exists for the |
mbed_official | 0:51ac1d130fd4 | 514 | * specified IP address, this entry is overwritten. |
mbed_official | 0:51ac1d130fd4 | 515 | * If packets are queued for the specified IP address, they are sent out. |
mbed_official | 0:51ac1d130fd4 | 516 | * |
mbed_official | 0:51ac1d130fd4 | 517 | * @param ipaddr IP address for the new static entry |
mbed_official | 0:51ac1d130fd4 | 518 | * @param ethaddr ethernet address for the new static entry |
mbed_official | 0:51ac1d130fd4 | 519 | * @return @see return values of etharp_add_static_entry |
mbed_official | 0:51ac1d130fd4 | 520 | */ |
mbed_official | 0:51ac1d130fd4 | 521 | err_t |
mbed_official | 0:51ac1d130fd4 | 522 | etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr) |
mbed_official | 0:51ac1d130fd4 | 523 | { |
mbed_official | 0:51ac1d130fd4 | 524 | struct netif *netif; |
mbed_official | 0:51ac1d130fd4 | 525 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_add_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n", |
mbed_official | 0:51ac1d130fd4 | 526 | ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr), |
mbed_official | 0:51ac1d130fd4 | 527 | ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2], |
mbed_official | 0:51ac1d130fd4 | 528 | ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5])); |
mbed_official | 0:51ac1d130fd4 | 529 | |
mbed_official | 0:51ac1d130fd4 | 530 | netif = ip_route(ipaddr); |
mbed_official | 0:51ac1d130fd4 | 531 | if (netif == NULL) { |
mbed_official | 0:51ac1d130fd4 | 532 | return ERR_RTE; |
mbed_official | 0:51ac1d130fd4 | 533 | } |
mbed_official | 0:51ac1d130fd4 | 534 | |
mbed_official | 0:51ac1d130fd4 | 535 | return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY); |
mbed_official | 0:51ac1d130fd4 | 536 | } |
mbed_official | 0:51ac1d130fd4 | 537 | |
mbed_official | 0:51ac1d130fd4 | 538 | /** Remove a static entry from the ARP table previously added with a call to |
mbed_official | 0:51ac1d130fd4 | 539 | * etharp_add_static_entry. |
mbed_official | 0:51ac1d130fd4 | 540 | * |
mbed_official | 0:51ac1d130fd4 | 541 | * @param ipaddr IP address of the static entry to remove |
mbed_official | 0:51ac1d130fd4 | 542 | * @return ERR_OK: entry removed |
mbed_official | 0:51ac1d130fd4 | 543 | * ERR_MEM: entry wasn't found |
mbed_official | 0:51ac1d130fd4 | 544 | * ERR_ARG: entry wasn't a static entry but a dynamic one |
mbed_official | 0:51ac1d130fd4 | 545 | */ |
mbed_official | 0:51ac1d130fd4 | 546 | err_t |
mbed_official | 0:51ac1d130fd4 | 547 | etharp_remove_static_entry(ip_addr_t *ipaddr) |
mbed_official | 0:51ac1d130fd4 | 548 | { |
mbed_official | 0:51ac1d130fd4 | 549 | s8_t i; |
mbed_official | 0:51ac1d130fd4 | 550 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
mbed_official | 0:51ac1d130fd4 | 551 | ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr))); |
mbed_official | 0:51ac1d130fd4 | 552 | |
mbed_official | 0:51ac1d130fd4 | 553 | /* find or create ARP entry */ |
mbed_official | 0:51ac1d130fd4 | 554 | i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY); |
mbed_official | 0:51ac1d130fd4 | 555 | /* bail out if no entry could be found */ |
mbed_official | 0:51ac1d130fd4 | 556 | if (i < 0) { |
mbed_official | 0:51ac1d130fd4 | 557 | return (err_t)i; |
mbed_official | 0:51ac1d130fd4 | 558 | } |
mbed_official | 0:51ac1d130fd4 | 559 | |
mbed_official | 0:51ac1d130fd4 | 560 | if ((arp_table[i].state != ETHARP_STATE_STABLE) || |
mbed_official | 0:51ac1d130fd4 | 561 | (arp_table[i].static_entry == 0)) { |
mbed_official | 0:51ac1d130fd4 | 562 | /* entry wasn't a static entry, cannot remove it */ |
mbed_official | 0:51ac1d130fd4 | 563 | return ERR_ARG; |
mbed_official | 0:51ac1d130fd4 | 564 | } |
mbed_official | 0:51ac1d130fd4 | 565 | /* entry found, free it */ |
mbed_official | 0:51ac1d130fd4 | 566 | free_entry(i); |
mbed_official | 0:51ac1d130fd4 | 567 | return ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 568 | } |
mbed_official | 0:51ac1d130fd4 | 569 | #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ |
mbed_official | 0:51ac1d130fd4 | 570 | |
mbed_official | 0:51ac1d130fd4 | 571 | /** |
mbed_official | 0:51ac1d130fd4 | 572 | * Finds (stable) ethernet/IP address pair from ARP table |
mbed_official | 0:51ac1d130fd4 | 573 | * using interface and IP address index. |
mbed_official | 0:51ac1d130fd4 | 574 | * @note the addresses in the ARP table are in network order! |
mbed_official | 0:51ac1d130fd4 | 575 | * |
mbed_official | 0:51ac1d130fd4 | 576 | * @param netif points to interface index |
mbed_official | 0:51ac1d130fd4 | 577 | * @param ipaddr points to the (network order) IP address index |
mbed_official | 0:51ac1d130fd4 | 578 | * @param eth_ret points to return pointer |
mbed_official | 0:51ac1d130fd4 | 579 | * @param ip_ret points to return pointer |
mbed_official | 0:51ac1d130fd4 | 580 | * @return table index if found, -1 otherwise |
mbed_official | 0:51ac1d130fd4 | 581 | */ |
mbed_official | 0:51ac1d130fd4 | 582 | s8_t |
mbed_official | 0:51ac1d130fd4 | 583 | etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr, |
mbed_official | 0:51ac1d130fd4 | 584 | struct eth_addr **eth_ret, ip_addr_t **ip_ret) |
mbed_official | 0:51ac1d130fd4 | 585 | { |
mbed_official | 0:51ac1d130fd4 | 586 | s8_t i; |
mbed_official | 0:51ac1d130fd4 | 587 | |
mbed_official | 0:51ac1d130fd4 | 588 | LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL", |
mbed_official | 0:51ac1d130fd4 | 589 | eth_ret != NULL && ip_ret != NULL); |
mbed_official | 0:51ac1d130fd4 | 590 | |
mbed_official | 0:51ac1d130fd4 | 591 | LWIP_UNUSED_ARG(netif); |
mbed_official | 0:51ac1d130fd4 | 592 | |
mbed_official | 0:51ac1d130fd4 | 593 | i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY); |
mbed_official | 0:51ac1d130fd4 | 594 | if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) { |
mbed_official | 0:51ac1d130fd4 | 595 | *eth_ret = &arp_table[i].ethaddr; |
mbed_official | 0:51ac1d130fd4 | 596 | *ip_ret = &arp_table[i].ipaddr; |
mbed_official | 0:51ac1d130fd4 | 597 | return i; |
mbed_official | 0:51ac1d130fd4 | 598 | } |
mbed_official | 0:51ac1d130fd4 | 599 | return -1; |
mbed_official | 0:51ac1d130fd4 | 600 | } |
mbed_official | 0:51ac1d130fd4 | 601 | |
mbed_official | 0:51ac1d130fd4 | 602 | #if ETHARP_TRUST_IP_MAC |
mbed_official | 0:51ac1d130fd4 | 603 | /** |
mbed_official | 0:51ac1d130fd4 | 604 | * Updates the ARP table using the given IP packet. |
mbed_official | 0:51ac1d130fd4 | 605 | * |
mbed_official | 0:51ac1d130fd4 | 606 | * Uses the incoming IP packet's source address to update the |
mbed_official | 0:51ac1d130fd4 | 607 | * ARP cache for the local network. The function does not alter |
mbed_official | 0:51ac1d130fd4 | 608 | * or free the packet. This function must be called before the |
mbed_official | 0:51ac1d130fd4 | 609 | * packet p is passed to the IP layer. |
mbed_official | 0:51ac1d130fd4 | 610 | * |
mbed_official | 0:51ac1d130fd4 | 611 | * @param netif The lwIP network interface on which the IP packet pbuf arrived. |
mbed_official | 0:51ac1d130fd4 | 612 | * @param p The IP packet that arrived on netif. |
mbed_official | 0:51ac1d130fd4 | 613 | * |
mbed_official | 0:51ac1d130fd4 | 614 | * @return NULL |
mbed_official | 0:51ac1d130fd4 | 615 | * |
mbed_official | 0:51ac1d130fd4 | 616 | * @see pbuf_free() |
mbed_official | 0:51ac1d130fd4 | 617 | */ |
mbed_official | 0:51ac1d130fd4 | 618 | static void |
mbed_official | 0:51ac1d130fd4 | 619 | etharp_ip_input(struct netif *netif, struct pbuf *p) |
mbed_official | 0:51ac1d130fd4 | 620 | { |
mbed_official | 0:51ac1d130fd4 | 621 | struct eth_hdr *ethhdr; |
mbed_official | 0:51ac1d130fd4 | 622 | struct ip_hdr *iphdr; |
mbed_official | 0:51ac1d130fd4 | 623 | ip_addr_t iphdr_src; |
mbed_official | 0:51ac1d130fd4 | 624 | LWIP_ERROR("netif != NULL", (netif != NULL), return;); |
mbed_official | 0:51ac1d130fd4 | 625 | |
mbed_official | 0:51ac1d130fd4 | 626 | /* Only insert an entry if the source IP address of the |
mbed_official | 0:51ac1d130fd4 | 627 | incoming IP packet comes from a host on the local network. */ |
mbed_official | 0:51ac1d130fd4 | 628 | ethhdr = (struct eth_hdr *)p->payload; |
mbed_official | 0:51ac1d130fd4 | 629 | iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR); |
mbed_official | 0:51ac1d130fd4 | 630 | #if ETHARP_SUPPORT_VLAN |
mbed_official | 0:51ac1d130fd4 | 631 | if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) { |
mbed_official | 0:51ac1d130fd4 | 632 | iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR); |
mbed_official | 0:51ac1d130fd4 | 633 | } |
mbed_official | 0:51ac1d130fd4 | 634 | #endif /* ETHARP_SUPPORT_VLAN */ |
mbed_official | 0:51ac1d130fd4 | 635 | |
mbed_official | 0:51ac1d130fd4 | 636 | ip_addr_copy(iphdr_src, iphdr->src); |
mbed_official | 0:51ac1d130fd4 | 637 | |
mbed_official | 0:51ac1d130fd4 | 638 | /* source is not on the local network? */ |
mbed_official | 0:51ac1d130fd4 | 639 | if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) { |
mbed_official | 0:51ac1d130fd4 | 640 | /* do nothing */ |
mbed_official | 0:51ac1d130fd4 | 641 | return; |
mbed_official | 0:51ac1d130fd4 | 642 | } |
mbed_official | 0:51ac1d130fd4 | 643 | |
mbed_official | 0:51ac1d130fd4 | 644 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n")); |
mbed_official | 0:51ac1d130fd4 | 645 | /* update the source IP address in the cache, if present */ |
mbed_official | 0:51ac1d130fd4 | 646 | /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk |
mbed_official | 0:51ac1d130fd4 | 647 | * back soon (for example, if the destination IP address is ours. */ |
mbed_official | 0:51ac1d130fd4 | 648 | update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY); |
mbed_official | 0:51ac1d130fd4 | 649 | } |
mbed_official | 0:51ac1d130fd4 | 650 | #endif /* ETHARP_TRUST_IP_MAC */ |
mbed_official | 0:51ac1d130fd4 | 651 | |
mbed_official | 0:51ac1d130fd4 | 652 | /** |
mbed_official | 0:51ac1d130fd4 | 653 | * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache |
mbed_official | 0:51ac1d130fd4 | 654 | * send out queued IP packets. Updates cache with snooped address pairs. |
mbed_official | 0:51ac1d130fd4 | 655 | * |
mbed_official | 0:51ac1d130fd4 | 656 | * Should be called for incoming ARP packets. The pbuf in the argument |
mbed_official | 0:51ac1d130fd4 | 657 | * is freed by this function. |
mbed_official | 0:51ac1d130fd4 | 658 | * |
mbed_official | 0:51ac1d130fd4 | 659 | * @param netif The lwIP network interface on which the ARP packet pbuf arrived. |
mbed_official | 0:51ac1d130fd4 | 660 | * @param ethaddr Ethernet address of netif. |
mbed_official | 0:51ac1d130fd4 | 661 | * @param p The ARP packet that arrived on netif. Is freed by this function. |
mbed_official | 0:51ac1d130fd4 | 662 | * |
mbed_official | 0:51ac1d130fd4 | 663 | * @return NULL |
mbed_official | 0:51ac1d130fd4 | 664 | * |
mbed_official | 0:51ac1d130fd4 | 665 | * @see pbuf_free() |
mbed_official | 0:51ac1d130fd4 | 666 | */ |
mbed_official | 0:51ac1d130fd4 | 667 | static void |
mbed_official | 0:51ac1d130fd4 | 668 | etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p) |
mbed_official | 0:51ac1d130fd4 | 669 | { |
mbed_official | 0:51ac1d130fd4 | 670 | struct etharp_hdr *hdr; |
mbed_official | 0:51ac1d130fd4 | 671 | struct eth_hdr *ethhdr; |
mbed_official | 0:51ac1d130fd4 | 672 | /* these are aligned properly, whereas the ARP header fields might not be */ |
mbed_official | 0:51ac1d130fd4 | 673 | ip_addr_t sipaddr, dipaddr; |
mbed_official | 0:51ac1d130fd4 | 674 | u8_t for_us; |
mbed_official | 0:51ac1d130fd4 | 675 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 676 | const u8_t * ethdst_hwaddr; |
mbed_official | 0:51ac1d130fd4 | 677 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 678 | |
mbed_official | 0:51ac1d130fd4 | 679 | LWIP_ERROR("netif != NULL", (netif != NULL), return;); |
mbed_official | 0:51ac1d130fd4 | 680 | |
mbed_official | 0:51ac1d130fd4 | 681 | /* drop short ARP packets: we have to check for p->len instead of p->tot_len here |
mbed_official | 0:51ac1d130fd4 | 682 | since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */ |
mbed_official | 0:51ac1d130fd4 | 683 | if (p->len < SIZEOF_ETHARP_PACKET) { |
mbed_official | 0:51ac1d130fd4 | 684 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, |
mbed_official | 0:51ac1d130fd4 | 685 | ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len, |
mbed_official | 0:51ac1d130fd4 | 686 | (s16_t)SIZEOF_ETHARP_PACKET)); |
mbed_official | 0:51ac1d130fd4 | 687 | ETHARP_STATS_INC(etharp.lenerr); |
mbed_official | 0:51ac1d130fd4 | 688 | ETHARP_STATS_INC(etharp.drop); |
mbed_official | 0:51ac1d130fd4 | 689 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 690 | return; |
mbed_official | 0:51ac1d130fd4 | 691 | } |
mbed_official | 0:51ac1d130fd4 | 692 | |
mbed_official | 0:51ac1d130fd4 | 693 | ethhdr = (struct eth_hdr *)p->payload; |
mbed_official | 0:51ac1d130fd4 | 694 | hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR); |
mbed_official | 0:51ac1d130fd4 | 695 | #if ETHARP_SUPPORT_VLAN |
mbed_official | 0:51ac1d130fd4 | 696 | if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) { |
mbed_official | 0:51ac1d130fd4 | 697 | hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR); |
mbed_official | 0:51ac1d130fd4 | 698 | } |
mbed_official | 0:51ac1d130fd4 | 699 | #endif /* ETHARP_SUPPORT_VLAN */ |
mbed_official | 0:51ac1d130fd4 | 700 | |
mbed_official | 0:51ac1d130fd4 | 701 | /* RFC 826 "Packet Reception": */ |
mbed_official | 0:51ac1d130fd4 | 702 | if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) || |
mbed_official | 0:51ac1d130fd4 | 703 | (hdr->hwlen != ETHARP_HWADDR_LEN) || |
mbed_official | 0:51ac1d130fd4 | 704 | (hdr->protolen != sizeof(ip_addr_t)) || |
mbed_official | 0:51ac1d130fd4 | 705 | (hdr->proto != PP_HTONS(ETHTYPE_IP))) { |
mbed_official | 0:51ac1d130fd4 | 706 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, |
mbed_official | 0:51ac1d130fd4 | 707 | ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n", |
mbed_official | 0:51ac1d130fd4 | 708 | hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen)); |
mbed_official | 0:51ac1d130fd4 | 709 | ETHARP_STATS_INC(etharp.proterr); |
mbed_official | 0:51ac1d130fd4 | 710 | ETHARP_STATS_INC(etharp.drop); |
mbed_official | 0:51ac1d130fd4 | 711 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 712 | return; |
mbed_official | 0:51ac1d130fd4 | 713 | } |
mbed_official | 0:51ac1d130fd4 | 714 | ETHARP_STATS_INC(etharp.recv); |
mbed_official | 0:51ac1d130fd4 | 715 | |
mbed_official | 0:51ac1d130fd4 | 716 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 717 | /* We have to check if a host already has configured our random |
mbed_official | 0:51ac1d130fd4 | 718 | * created link local address and continously check if there is |
mbed_official | 0:51ac1d130fd4 | 719 | * a host with this IP-address so we can detect collisions */ |
mbed_official | 0:51ac1d130fd4 | 720 | autoip_arp_reply(netif, hdr); |
mbed_official | 0:51ac1d130fd4 | 721 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 722 | |
mbed_official | 0:51ac1d130fd4 | 723 | /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without |
mbed_official | 0:51ac1d130fd4 | 724 | * structure packing (not using structure copy which breaks strict-aliasing rules). */ |
mbed_official | 0:51ac1d130fd4 | 725 | IPADDR2_COPY(&sipaddr, &hdr->sipaddr); |
mbed_official | 0:51ac1d130fd4 | 726 | IPADDR2_COPY(&dipaddr, &hdr->dipaddr); |
mbed_official | 0:51ac1d130fd4 | 727 | |
mbed_official | 0:51ac1d130fd4 | 728 | /* this interface is not configured? */ |
mbed_official | 0:51ac1d130fd4 | 729 | if (ip_addr_isany(&netif->ip_addr)) { |
mbed_official | 0:51ac1d130fd4 | 730 | for_us = 0; |
mbed_official | 0:51ac1d130fd4 | 731 | } else { |
mbed_official | 0:51ac1d130fd4 | 732 | /* ARP packet directed to us? */ |
mbed_official | 0:51ac1d130fd4 | 733 | for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr)); |
mbed_official | 0:51ac1d130fd4 | 734 | } |
mbed_official | 0:51ac1d130fd4 | 735 | |
mbed_official | 0:51ac1d130fd4 | 736 | /* ARP message directed to us? |
mbed_official | 0:51ac1d130fd4 | 737 | -> add IP address in ARP cache; assume requester wants to talk to us, |
mbed_official | 0:51ac1d130fd4 | 738 | can result in directly sending the queued packets for this host. |
mbed_official | 0:51ac1d130fd4 | 739 | ARP message not directed to us? |
mbed_official | 0:51ac1d130fd4 | 740 | -> update the source IP address in the cache, if present */ |
mbed_official | 0:51ac1d130fd4 | 741 | update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), |
mbed_official | 0:51ac1d130fd4 | 742 | for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY); |
mbed_official | 0:51ac1d130fd4 | 743 | |
mbed_official | 0:51ac1d130fd4 | 744 | /* now act on the message itself */ |
mbed_official | 0:51ac1d130fd4 | 745 | switch (hdr->opcode) { |
mbed_official | 0:51ac1d130fd4 | 746 | /* ARP request? */ |
mbed_official | 0:51ac1d130fd4 | 747 | case PP_HTONS(ARP_REQUEST): |
mbed_official | 0:51ac1d130fd4 | 748 | /* ARP request. If it asked for our address, we send out a |
mbed_official | 0:51ac1d130fd4 | 749 | * reply. In any case, we time-stamp any existing ARP entry, |
mbed_official | 0:51ac1d130fd4 | 750 | * and possiby send out an IP packet that was queued on it. */ |
mbed_official | 0:51ac1d130fd4 | 751 | |
mbed_official | 0:51ac1d130fd4 | 752 | LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n")); |
mbed_official | 0:51ac1d130fd4 | 753 | /* ARP request for our address? */ |
mbed_official | 0:51ac1d130fd4 | 754 | if (for_us) { |
mbed_official | 0:51ac1d130fd4 | 755 | |
mbed_official | 0:51ac1d130fd4 | 756 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n")); |
mbed_official | 0:51ac1d130fd4 | 757 | /* Re-use pbuf to send ARP reply. |
mbed_official | 0:51ac1d130fd4 | 758 | Since we are re-using an existing pbuf, we can't call etharp_raw since |
mbed_official | 0:51ac1d130fd4 | 759 | that would allocate a new pbuf. */ |
mbed_official | 0:51ac1d130fd4 | 760 | hdr->opcode = htons(ARP_REPLY); |
mbed_official | 0:51ac1d130fd4 | 761 | |
mbed_official | 0:51ac1d130fd4 | 762 | IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr); |
mbed_official | 0:51ac1d130fd4 | 763 | IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr); |
mbed_official | 0:51ac1d130fd4 | 764 | |
mbed_official | 0:51ac1d130fd4 | 765 | LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!", |
mbed_official | 0:51ac1d130fd4 | 766 | (netif->hwaddr_len == ETHARP_HWADDR_LEN)); |
mbed_official | 0:51ac1d130fd4 | 767 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 768 | /* If we are using Link-Local, all ARP packets that contain a Link-Local |
mbed_official | 0:51ac1d130fd4 | 769 | * 'sender IP address' MUST be sent using link-layer broadcast instead of |
mbed_official | 0:51ac1d130fd4 | 770 | * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */ |
mbed_official | 0:51ac1d130fd4 | 771 | ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr; |
mbed_official | 0:51ac1d130fd4 | 772 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 773 | |
mbed_official | 0:51ac1d130fd4 | 774 | ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr); |
mbed_official | 0:51ac1d130fd4 | 775 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 776 | ETHADDR16_COPY(ðhdr->dest, ethdst_hwaddr); |
mbed_official | 0:51ac1d130fd4 | 777 | #else /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 778 | ETHADDR16_COPY(ðhdr->dest, &hdr->shwaddr); |
mbed_official | 0:51ac1d130fd4 | 779 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 780 | ETHADDR16_COPY(&hdr->shwaddr, ethaddr); |
mbed_official | 0:51ac1d130fd4 | 781 | ETHADDR16_COPY(ðhdr->src, ethaddr); |
mbed_official | 0:51ac1d130fd4 | 782 | |
mbed_official | 0:51ac1d130fd4 | 783 | /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header |
mbed_official | 0:51ac1d130fd4 | 784 | are already correct, we tested that before */ |
mbed_official | 0:51ac1d130fd4 | 785 | |
mbed_official | 0:51ac1d130fd4 | 786 | /* return ARP reply */ |
mbed_official | 0:51ac1d130fd4 | 787 | netif->linkoutput(netif, p); |
mbed_official | 0:51ac1d130fd4 | 788 | /* we are not configured? */ |
mbed_official | 0:51ac1d130fd4 | 789 | } else if (ip_addr_isany(&netif->ip_addr)) { |
mbed_official | 0:51ac1d130fd4 | 790 | /* { for_us == 0 and netif->ip_addr.addr == 0 } */ |
mbed_official | 0:51ac1d130fd4 | 791 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n")); |
mbed_official | 0:51ac1d130fd4 | 792 | /* request was not directed to us */ |
mbed_official | 0:51ac1d130fd4 | 793 | } else { |
mbed_official | 0:51ac1d130fd4 | 794 | /* { for_us == 0 and netif->ip_addr.addr != 0 } */ |
mbed_official | 0:51ac1d130fd4 | 795 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n")); |
mbed_official | 0:51ac1d130fd4 | 796 | } |
mbed_official | 0:51ac1d130fd4 | 797 | break; |
mbed_official | 0:51ac1d130fd4 | 798 | case PP_HTONS(ARP_REPLY): |
mbed_official | 0:51ac1d130fd4 | 799 | /* ARP reply. We already updated the ARP cache earlier. */ |
mbed_official | 0:51ac1d130fd4 | 800 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n")); |
mbed_official | 0:51ac1d130fd4 | 801 | #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK) |
mbed_official | 0:51ac1d130fd4 | 802 | /* DHCP wants to know about ARP replies from any host with an |
mbed_official | 0:51ac1d130fd4 | 803 | * IP address also offered to us by the DHCP server. We do not |
mbed_official | 0:51ac1d130fd4 | 804 | * want to take a duplicate IP address on a single network. |
mbed_official | 0:51ac1d130fd4 | 805 | * @todo How should we handle redundant (fail-over) interfaces? */ |
mbed_official | 0:51ac1d130fd4 | 806 | dhcp_arp_reply(netif, &sipaddr); |
mbed_official | 0:51ac1d130fd4 | 807 | #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */ |
mbed_official | 0:51ac1d130fd4 | 808 | break; |
mbed_official | 0:51ac1d130fd4 | 809 | default: |
mbed_official | 0:51ac1d130fd4 | 810 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode))); |
mbed_official | 0:51ac1d130fd4 | 811 | ETHARP_STATS_INC(etharp.err); |
mbed_official | 0:51ac1d130fd4 | 812 | break; |
mbed_official | 0:51ac1d130fd4 | 813 | } |
mbed_official | 0:51ac1d130fd4 | 814 | /* free ARP packet */ |
mbed_official | 0:51ac1d130fd4 | 815 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 816 | } |
mbed_official | 0:51ac1d130fd4 | 817 | |
mbed_official | 0:51ac1d130fd4 | 818 | /** |
mbed_official | 0:51ac1d130fd4 | 819 | * Resolve and fill-in Ethernet address header for outgoing IP packet. |
mbed_official | 0:51ac1d130fd4 | 820 | * |
mbed_official | 0:51ac1d130fd4 | 821 | * For IP multicast and broadcast, corresponding Ethernet addresses |
mbed_official | 0:51ac1d130fd4 | 822 | * are selected and the packet is transmitted on the link. |
mbed_official | 0:51ac1d130fd4 | 823 | * |
mbed_official | 0:51ac1d130fd4 | 824 | * For unicast addresses, the packet is submitted to etharp_query(). In |
mbed_official | 0:51ac1d130fd4 | 825 | * case the IP address is outside the local network, the IP address of |
mbed_official | 0:51ac1d130fd4 | 826 | * the gateway is used. |
mbed_official | 0:51ac1d130fd4 | 827 | * |
mbed_official | 0:51ac1d130fd4 | 828 | * @param netif The lwIP network interface which the IP packet will be sent on. |
mbed_official | 0:51ac1d130fd4 | 829 | * @param q The pbuf(s) containing the IP packet to be sent. |
mbed_official | 0:51ac1d130fd4 | 830 | * @param ipaddr The IP address of the packet destination. |
mbed_official | 0:51ac1d130fd4 | 831 | * |
mbed_official | 0:51ac1d130fd4 | 832 | * @return |
mbed_official | 0:51ac1d130fd4 | 833 | * - ERR_RTE No route to destination (no gateway to external networks), |
mbed_official | 0:51ac1d130fd4 | 834 | * or the return type of either etharp_query() or etharp_send_ip(). |
mbed_official | 0:51ac1d130fd4 | 835 | */ |
mbed_official | 0:51ac1d130fd4 | 836 | err_t |
mbed_official | 0:51ac1d130fd4 | 837 | etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr) |
mbed_official | 0:51ac1d130fd4 | 838 | { |
mbed_official | 0:51ac1d130fd4 | 839 | struct eth_addr *dest, mcastaddr; |
mbed_official | 0:51ac1d130fd4 | 840 | |
mbed_official | 0:51ac1d130fd4 | 841 | /* make room for Ethernet header - should not fail */ |
mbed_official | 0:51ac1d130fd4 | 842 | if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) { |
mbed_official | 0:51ac1d130fd4 | 843 | /* bail out */ |
mbed_official | 0:51ac1d130fd4 | 844 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, |
mbed_official | 0:51ac1d130fd4 | 845 | ("etharp_output: could not allocate room for header.\n")); |
mbed_official | 0:51ac1d130fd4 | 846 | LINK_STATS_INC(link.lenerr); |
mbed_official | 0:51ac1d130fd4 | 847 | return ERR_BUF; |
mbed_official | 0:51ac1d130fd4 | 848 | } |
mbed_official | 0:51ac1d130fd4 | 849 | |
mbed_official | 0:51ac1d130fd4 | 850 | /* assume unresolved Ethernet address */ |
mbed_official | 0:51ac1d130fd4 | 851 | dest = NULL; |
mbed_official | 0:51ac1d130fd4 | 852 | /* Determine on destination hardware address. Broadcasts and multicasts |
mbed_official | 0:51ac1d130fd4 | 853 | * are special, other IP addresses are looked up in the ARP table. */ |
mbed_official | 0:51ac1d130fd4 | 854 | |
mbed_official | 0:51ac1d130fd4 | 855 | /* broadcast destination IP address? */ |
mbed_official | 0:51ac1d130fd4 | 856 | if (ip_addr_isbroadcast(ipaddr, netif)) { |
mbed_official | 0:51ac1d130fd4 | 857 | /* broadcast on Ethernet also */ |
mbed_official | 0:51ac1d130fd4 | 858 | dest = (struct eth_addr *)ðbroadcast; |
mbed_official | 0:51ac1d130fd4 | 859 | /* multicast destination IP address? */ |
mbed_official | 0:51ac1d130fd4 | 860 | } else if (ip_addr_ismulticast(ipaddr)) { |
mbed_official | 0:51ac1d130fd4 | 861 | /* Hash IP multicast address to MAC address.*/ |
mbed_official | 0:51ac1d130fd4 | 862 | mcastaddr.addr[0] = 0x01; |
mbed_official | 0:51ac1d130fd4 | 863 | mcastaddr.addr[1] = 0x00; |
mbed_official | 0:51ac1d130fd4 | 864 | mcastaddr.addr[2] = 0x5e; |
mbed_official | 0:51ac1d130fd4 | 865 | mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f; |
mbed_official | 0:51ac1d130fd4 | 866 | mcastaddr.addr[4] = ip4_addr3(ipaddr); |
mbed_official | 0:51ac1d130fd4 | 867 | mcastaddr.addr[5] = ip4_addr4(ipaddr); |
mbed_official | 0:51ac1d130fd4 | 868 | /* destination Ethernet address is multicast */ |
mbed_official | 0:51ac1d130fd4 | 869 | dest = &mcastaddr; |
mbed_official | 0:51ac1d130fd4 | 870 | /* unicast destination IP address? */ |
mbed_official | 0:51ac1d130fd4 | 871 | } else { |
mbed_official | 0:51ac1d130fd4 | 872 | /* outside local network? */ |
mbed_official | 0:51ac1d130fd4 | 873 | if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) && |
mbed_official | 0:51ac1d130fd4 | 874 | !ip_addr_islinklocal(ipaddr)) { |
mbed_official | 0:51ac1d130fd4 | 875 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 876 | struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload + |
mbed_official | 0:51ac1d130fd4 | 877 | sizeof(struct eth_hdr)); |
mbed_official | 0:51ac1d130fd4 | 878 | /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with |
mbed_official | 0:51ac1d130fd4 | 879 | a link-local source address must always be "directly to its destination |
mbed_official | 0:51ac1d130fd4 | 880 | on the same physical link. The host MUST NOT send the packet to any |
mbed_official | 0:51ac1d130fd4 | 881 | router for forwarding". */ |
mbed_official | 0:51ac1d130fd4 | 882 | if (!ip_addr_islinklocal(&iphdr->src)) |
mbed_official | 0:51ac1d130fd4 | 883 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 884 | { |
mbed_official | 0:51ac1d130fd4 | 885 | /* interface has default gateway? */ |
mbed_official | 0:51ac1d130fd4 | 886 | if (!ip_addr_isany(&netif->gw)) { |
mbed_official | 0:51ac1d130fd4 | 887 | /* send to hardware address of default gateway IP address */ |
mbed_official | 0:51ac1d130fd4 | 888 | ipaddr = &(netif->gw); |
mbed_official | 0:51ac1d130fd4 | 889 | /* no default gateway available */ |
mbed_official | 0:51ac1d130fd4 | 890 | } else { |
mbed_official | 0:51ac1d130fd4 | 891 | /* no route to destination error (default gateway missing) */ |
mbed_official | 0:51ac1d130fd4 | 892 | return ERR_RTE; |
mbed_official | 0:51ac1d130fd4 | 893 | } |
mbed_official | 0:51ac1d130fd4 | 894 | } |
mbed_official | 0:51ac1d130fd4 | 895 | } |
mbed_official | 0:51ac1d130fd4 | 896 | #if LWIP_NETIF_HWADDRHINT |
mbed_official | 0:51ac1d130fd4 | 897 | if (netif->addr_hint != NULL) { |
mbed_official | 0:51ac1d130fd4 | 898 | /* per-pcb cached entry was given */ |
mbed_official | 0:51ac1d130fd4 | 899 | u8_t etharp_cached_entry = *(netif->addr_hint); |
mbed_official | 0:51ac1d130fd4 | 900 | if (etharp_cached_entry < ARP_TABLE_SIZE) { |
mbed_official | 0:51ac1d130fd4 | 901 | #endif /* LWIP_NETIF_HWADDRHINT */ |
mbed_official | 0:51ac1d130fd4 | 902 | if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) && |
mbed_official | 0:51ac1d130fd4 | 903 | (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) { |
mbed_official | 0:51ac1d130fd4 | 904 | /* the per-pcb-cached entry is stable and the right one! */ |
mbed_official | 0:51ac1d130fd4 | 905 | ETHARP_STATS_INC(etharp.cachehit); |
mbed_official | 0:51ac1d130fd4 | 906 | return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), |
mbed_official | 0:51ac1d130fd4 | 907 | &arp_table[etharp_cached_entry].ethaddr); |
mbed_official | 0:51ac1d130fd4 | 908 | } |
mbed_official | 0:51ac1d130fd4 | 909 | #if LWIP_NETIF_HWADDRHINT |
mbed_official | 0:51ac1d130fd4 | 910 | } |
mbed_official | 0:51ac1d130fd4 | 911 | } |
mbed_official | 0:51ac1d130fd4 | 912 | #endif /* LWIP_NETIF_HWADDRHINT */ |
mbed_official | 0:51ac1d130fd4 | 913 | /* queue on destination Ethernet address belonging to ipaddr */ |
mbed_official | 0:51ac1d130fd4 | 914 | return etharp_query(netif, ipaddr, q); |
mbed_official | 0:51ac1d130fd4 | 915 | } |
mbed_official | 0:51ac1d130fd4 | 916 | |
mbed_official | 0:51ac1d130fd4 | 917 | /* continuation for multicast/broadcast destinations */ |
mbed_official | 0:51ac1d130fd4 | 918 | /* obtain source Ethernet address of the given interface */ |
mbed_official | 0:51ac1d130fd4 | 919 | /* send packet directly on the link */ |
mbed_official | 0:51ac1d130fd4 | 920 | return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest); |
mbed_official | 0:51ac1d130fd4 | 921 | } |
mbed_official | 0:51ac1d130fd4 | 922 | |
mbed_official | 0:51ac1d130fd4 | 923 | /** |
mbed_official | 0:51ac1d130fd4 | 924 | * Send an ARP request for the given IP address and/or queue a packet. |
mbed_official | 0:51ac1d130fd4 | 925 | * |
mbed_official | 0:51ac1d130fd4 | 926 | * If the IP address was not yet in the cache, a pending ARP cache entry |
mbed_official | 0:51ac1d130fd4 | 927 | * is added and an ARP request is sent for the given address. The packet |
mbed_official | 0:51ac1d130fd4 | 928 | * is queued on this entry. |
mbed_official | 0:51ac1d130fd4 | 929 | * |
mbed_official | 0:51ac1d130fd4 | 930 | * If the IP address was already pending in the cache, a new ARP request |
mbed_official | 0:51ac1d130fd4 | 931 | * is sent for the given address. The packet is queued on this entry. |
mbed_official | 0:51ac1d130fd4 | 932 | * |
mbed_official | 0:51ac1d130fd4 | 933 | * If the IP address was already stable in the cache, and a packet is |
mbed_official | 0:51ac1d130fd4 | 934 | * given, it is directly sent and no ARP request is sent out. |
mbed_official | 0:51ac1d130fd4 | 935 | * |
mbed_official | 0:51ac1d130fd4 | 936 | * If the IP address was already stable in the cache, and no packet is |
mbed_official | 0:51ac1d130fd4 | 937 | * given, an ARP request is sent out. |
mbed_official | 0:51ac1d130fd4 | 938 | * |
mbed_official | 0:51ac1d130fd4 | 939 | * @param netif The lwIP network interface on which ipaddr |
mbed_official | 0:51ac1d130fd4 | 940 | * must be queried for. |
mbed_official | 0:51ac1d130fd4 | 941 | * @param ipaddr The IP address to be resolved. |
mbed_official | 0:51ac1d130fd4 | 942 | * @param q If non-NULL, a pbuf that must be delivered to the IP address. |
mbed_official | 0:51ac1d130fd4 | 943 | * q is not freed by this function. |
mbed_official | 0:51ac1d130fd4 | 944 | * |
mbed_official | 0:51ac1d130fd4 | 945 | * @note q must only be ONE packet, not a packet queue! |
mbed_official | 0:51ac1d130fd4 | 946 | * |
mbed_official | 0:51ac1d130fd4 | 947 | * @return |
mbed_official | 0:51ac1d130fd4 | 948 | * - ERR_BUF Could not make room for Ethernet header. |
mbed_official | 0:51ac1d130fd4 | 949 | * - ERR_MEM Hardware address unknown, and no more ARP entries available |
mbed_official | 0:51ac1d130fd4 | 950 | * to query for address or queue the packet. |
mbed_official | 0:51ac1d130fd4 | 951 | * - ERR_MEM Could not queue packet due to memory shortage. |
mbed_official | 0:51ac1d130fd4 | 952 | * - ERR_RTE No route to destination (no gateway to external networks). |
mbed_official | 0:51ac1d130fd4 | 953 | * - ERR_ARG Non-unicast address given, those will not appear in ARP cache. |
mbed_official | 0:51ac1d130fd4 | 954 | * |
mbed_official | 0:51ac1d130fd4 | 955 | */ |
mbed_official | 0:51ac1d130fd4 | 956 | err_t |
mbed_official | 0:51ac1d130fd4 | 957 | etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q) |
mbed_official | 0:51ac1d130fd4 | 958 | { |
mbed_official | 0:51ac1d130fd4 | 959 | struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr; |
mbed_official | 0:51ac1d130fd4 | 960 | err_t result = ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 961 | s8_t i; /* ARP entry index */ |
mbed_official | 0:51ac1d130fd4 | 962 | |
mbed_official | 0:51ac1d130fd4 | 963 | /* non-unicast address? */ |
mbed_official | 0:51ac1d130fd4 | 964 | if (ip_addr_isbroadcast(ipaddr, netif) || |
mbed_official | 0:51ac1d130fd4 | 965 | ip_addr_ismulticast(ipaddr) || |
mbed_official | 0:51ac1d130fd4 | 966 | ip_addr_isany(ipaddr)) { |
mbed_official | 0:51ac1d130fd4 | 967 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n")); |
mbed_official | 0:51ac1d130fd4 | 968 | return ERR_ARG; |
mbed_official | 0:51ac1d130fd4 | 969 | } |
mbed_official | 0:51ac1d130fd4 | 970 | |
mbed_official | 0:51ac1d130fd4 | 971 | /* find entry in ARP cache, ask to create entry if queueing packet */ |
mbed_official | 0:51ac1d130fd4 | 972 | i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD); |
mbed_official | 0:51ac1d130fd4 | 973 | |
mbed_official | 0:51ac1d130fd4 | 974 | /* could not find or create entry? */ |
mbed_official | 0:51ac1d130fd4 | 975 | if (i < 0) { |
mbed_official | 0:51ac1d130fd4 | 976 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n")); |
mbed_official | 0:51ac1d130fd4 | 977 | if (q) { |
mbed_official | 0:51ac1d130fd4 | 978 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n")); |
mbed_official | 0:51ac1d130fd4 | 979 | ETHARP_STATS_INC(etharp.memerr); |
mbed_official | 0:51ac1d130fd4 | 980 | } |
mbed_official | 0:51ac1d130fd4 | 981 | return (err_t)i; |
mbed_official | 0:51ac1d130fd4 | 982 | } |
mbed_official | 0:51ac1d130fd4 | 983 | |
mbed_official | 0:51ac1d130fd4 | 984 | /* mark a fresh entry as pending (we just sent a request) */ |
mbed_official | 0:51ac1d130fd4 | 985 | if (arp_table[i].state == ETHARP_STATE_EMPTY) { |
mbed_official | 0:51ac1d130fd4 | 986 | arp_table[i].state = ETHARP_STATE_PENDING; |
mbed_official | 0:51ac1d130fd4 | 987 | } |
mbed_official | 0:51ac1d130fd4 | 988 | |
mbed_official | 0:51ac1d130fd4 | 989 | /* { i is either a STABLE or (new or existing) PENDING entry } */ |
mbed_official | 0:51ac1d130fd4 | 990 | LWIP_ASSERT("arp_table[i].state == PENDING or STABLE", |
mbed_official | 0:51ac1d130fd4 | 991 | ((arp_table[i].state == ETHARP_STATE_PENDING) || |
mbed_official | 0:51ac1d130fd4 | 992 | (arp_table[i].state == ETHARP_STATE_STABLE))); |
mbed_official | 0:51ac1d130fd4 | 993 | |
mbed_official | 0:51ac1d130fd4 | 994 | /* do we have a pending entry? or an implicit query request? */ |
mbed_official | 0:51ac1d130fd4 | 995 | if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) { |
mbed_official | 0:51ac1d130fd4 | 996 | /* try to resolve it; send out ARP request */ |
mbed_official | 0:51ac1d130fd4 | 997 | result = etharp_request(netif, ipaddr); |
mbed_official | 0:51ac1d130fd4 | 998 | if (result != ERR_OK) { |
mbed_official | 0:51ac1d130fd4 | 999 | /* ARP request couldn't be sent */ |
mbed_official | 0:51ac1d130fd4 | 1000 | /* We don't re-send arp request in etharp_tmr, but we still queue packets, |
mbed_official | 0:51ac1d130fd4 | 1001 | since this failure could be temporary, and the next packet calling |
mbed_official | 0:51ac1d130fd4 | 1002 | etharp_query again could lead to sending the queued packets. */ |
mbed_official | 0:51ac1d130fd4 | 1003 | } |
mbed_official | 0:51ac1d130fd4 | 1004 | if (q == NULL) { |
mbed_official | 0:51ac1d130fd4 | 1005 | return result; |
mbed_official | 0:51ac1d130fd4 | 1006 | } |
mbed_official | 0:51ac1d130fd4 | 1007 | } |
mbed_official | 0:51ac1d130fd4 | 1008 | |
mbed_official | 0:51ac1d130fd4 | 1009 | /* packet given? */ |
mbed_official | 0:51ac1d130fd4 | 1010 | LWIP_ASSERT("q != NULL", q != NULL); |
mbed_official | 0:51ac1d130fd4 | 1011 | /* stable entry? */ |
mbed_official | 0:51ac1d130fd4 | 1012 | if (arp_table[i].state == ETHARP_STATE_STABLE) { |
mbed_official | 0:51ac1d130fd4 | 1013 | /* we have a valid IP->Ethernet address mapping */ |
mbed_official | 0:51ac1d130fd4 | 1014 | ETHARP_SET_HINT(netif, i); |
mbed_official | 0:51ac1d130fd4 | 1015 | /* send the packet */ |
mbed_official | 0:51ac1d130fd4 | 1016 | result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr)); |
mbed_official | 0:51ac1d130fd4 | 1017 | /* pending entry? (either just created or already pending */ |
mbed_official | 0:51ac1d130fd4 | 1018 | } else if (arp_table[i].state == ETHARP_STATE_PENDING) { |
mbed_official | 0:51ac1d130fd4 | 1019 | /* entry is still pending, queue the given packet 'q' */ |
mbed_official | 0:51ac1d130fd4 | 1020 | struct pbuf *p; |
mbed_official | 0:51ac1d130fd4 | 1021 | int copy_needed = 0; |
mbed_official | 0:51ac1d130fd4 | 1022 | /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but |
mbed_official | 0:51ac1d130fd4 | 1023 | * to copy the whole queue into a new PBUF_RAM (see bug #11400) |
mbed_official | 0:51ac1d130fd4 | 1024 | * PBUF_ROMs can be left as they are, since ROM must not get changed. */ |
mbed_official | 0:51ac1d130fd4 | 1025 | p = q; |
mbed_official | 0:51ac1d130fd4 | 1026 | while (p) { |
mbed_official | 0:51ac1d130fd4 | 1027 | LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0)); |
mbed_official | 0:51ac1d130fd4 | 1028 | if(p->type != PBUF_ROM) { |
mbed_official | 0:51ac1d130fd4 | 1029 | copy_needed = 1; |
mbed_official | 0:51ac1d130fd4 | 1030 | break; |
mbed_official | 0:51ac1d130fd4 | 1031 | } |
mbed_official | 0:51ac1d130fd4 | 1032 | p = p->next; |
mbed_official | 0:51ac1d130fd4 | 1033 | } |
mbed_official | 0:51ac1d130fd4 | 1034 | if(copy_needed) { |
mbed_official | 0:51ac1d130fd4 | 1035 | /* copy the whole packet into new pbufs */ |
mbed_official | 0:51ac1d130fd4 | 1036 | p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM); |
mbed_official | 0:51ac1d130fd4 | 1037 | if(p != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1038 | if (pbuf_copy(p, q) != ERR_OK) { |
mbed_official | 0:51ac1d130fd4 | 1039 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 1040 | p = NULL; |
mbed_official | 0:51ac1d130fd4 | 1041 | } |
mbed_official | 0:51ac1d130fd4 | 1042 | } |
mbed_official | 0:51ac1d130fd4 | 1043 | } else { |
mbed_official | 0:51ac1d130fd4 | 1044 | /* referencing the old pbuf is enough */ |
mbed_official | 0:51ac1d130fd4 | 1045 | p = q; |
mbed_official | 0:51ac1d130fd4 | 1046 | pbuf_ref(p); |
mbed_official | 0:51ac1d130fd4 | 1047 | } |
mbed_official | 0:51ac1d130fd4 | 1048 | /* packet could be taken over? */ |
mbed_official | 0:51ac1d130fd4 | 1049 | if (p != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1050 | /* queue packet ... */ |
mbed_official | 0:51ac1d130fd4 | 1051 | #if ARP_QUEUEING |
mbed_official | 0:51ac1d130fd4 | 1052 | struct etharp_q_entry *new_entry; |
mbed_official | 0:51ac1d130fd4 | 1053 | /* allocate a new arp queue entry */ |
mbed_official | 0:51ac1d130fd4 | 1054 | new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE); |
mbed_official | 0:51ac1d130fd4 | 1055 | if (new_entry != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1056 | new_entry->next = 0; |
mbed_official | 0:51ac1d130fd4 | 1057 | new_entry->p = p; |
mbed_official | 0:51ac1d130fd4 | 1058 | if(arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1059 | /* queue was already existent, append the new entry to the end */ |
mbed_official | 0:51ac1d130fd4 | 1060 | struct etharp_q_entry *r; |
mbed_official | 0:51ac1d130fd4 | 1061 | r = arp_table[i].q; |
mbed_official | 0:51ac1d130fd4 | 1062 | while (r->next != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1063 | r = r->next; |
mbed_official | 0:51ac1d130fd4 | 1064 | } |
mbed_official | 0:51ac1d130fd4 | 1065 | r->next = new_entry; |
mbed_official | 0:51ac1d130fd4 | 1066 | } else { |
mbed_official | 0:51ac1d130fd4 | 1067 | /* queue did not exist, first item in queue */ |
mbed_official | 0:51ac1d130fd4 | 1068 | arp_table[i].q = new_entry; |
mbed_official | 0:51ac1d130fd4 | 1069 | } |
mbed_official | 0:51ac1d130fd4 | 1070 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 1071 | result = ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1072 | } else { |
mbed_official | 0:51ac1d130fd4 | 1073 | /* the pool MEMP_ARP_QUEUE is empty */ |
mbed_official | 0:51ac1d130fd4 | 1074 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 1075 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q)); |
mbed_official | 0:51ac1d130fd4 | 1076 | result = ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 1077 | } |
mbed_official | 0:51ac1d130fd4 | 1078 | #else /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 1079 | /* always queue one packet per ARP request only, freeing a previously queued packet */ |
mbed_official | 0:51ac1d130fd4 | 1080 | if (arp_table[i].q != NULL) { |
mbed_official | 0:51ac1d130fd4 | 1081 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: dropped previously queued packet %p for ARP entry %"S16_F"\n", (void *)q, (s16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 1082 | pbuf_free(arp_table[i].q); |
mbed_official | 0:51ac1d130fd4 | 1083 | } |
mbed_official | 0:51ac1d130fd4 | 1084 | arp_table[i].q = p; |
mbed_official | 0:51ac1d130fd4 | 1085 | result = ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1086 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i)); |
mbed_official | 0:51ac1d130fd4 | 1087 | #endif /* ARP_QUEUEING */ |
mbed_official | 0:51ac1d130fd4 | 1088 | } else { |
mbed_official | 0:51ac1d130fd4 | 1089 | ETHARP_STATS_INC(etharp.memerr); |
mbed_official | 0:51ac1d130fd4 | 1090 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q)); |
mbed_official | 0:51ac1d130fd4 | 1091 | result = ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 1092 | } |
mbed_official | 0:51ac1d130fd4 | 1093 | } |
mbed_official | 0:51ac1d130fd4 | 1094 | return result; |
mbed_official | 0:51ac1d130fd4 | 1095 | } |
mbed_official | 0:51ac1d130fd4 | 1096 | |
mbed_official | 0:51ac1d130fd4 | 1097 | /** |
mbed_official | 0:51ac1d130fd4 | 1098 | * Send a raw ARP packet (opcode and all addresses can be modified) |
mbed_official | 0:51ac1d130fd4 | 1099 | * |
mbed_official | 0:51ac1d130fd4 | 1100 | * @param netif the lwip network interface on which to send the ARP packet |
mbed_official | 0:51ac1d130fd4 | 1101 | * @param ethsrc_addr the source MAC address for the ethernet header |
mbed_official | 0:51ac1d130fd4 | 1102 | * @param ethdst_addr the destination MAC address for the ethernet header |
mbed_official | 0:51ac1d130fd4 | 1103 | * @param hwsrc_addr the source MAC address for the ARP protocol header |
mbed_official | 0:51ac1d130fd4 | 1104 | * @param ipsrc_addr the source IP address for the ARP protocol header |
mbed_official | 0:51ac1d130fd4 | 1105 | * @param hwdst_addr the destination MAC address for the ARP protocol header |
mbed_official | 0:51ac1d130fd4 | 1106 | * @param ipdst_addr the destination IP address for the ARP protocol header |
mbed_official | 0:51ac1d130fd4 | 1107 | * @param opcode the type of the ARP packet |
mbed_official | 0:51ac1d130fd4 | 1108 | * @return ERR_OK if the ARP packet has been sent |
mbed_official | 0:51ac1d130fd4 | 1109 | * ERR_MEM if the ARP packet couldn't be allocated |
mbed_official | 0:51ac1d130fd4 | 1110 | * any other err_t on failure |
mbed_official | 0:51ac1d130fd4 | 1111 | */ |
mbed_official | 0:51ac1d130fd4 | 1112 | #if !LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 1113 | static |
mbed_official | 0:51ac1d130fd4 | 1114 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 1115 | err_t |
mbed_official | 0:51ac1d130fd4 | 1116 | etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr, |
mbed_official | 0:51ac1d130fd4 | 1117 | const struct eth_addr *ethdst_addr, |
mbed_official | 0:51ac1d130fd4 | 1118 | const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr, |
mbed_official | 0:51ac1d130fd4 | 1119 | const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr, |
mbed_official | 0:51ac1d130fd4 | 1120 | const u16_t opcode) |
mbed_official | 0:51ac1d130fd4 | 1121 | { |
mbed_official | 0:51ac1d130fd4 | 1122 | struct pbuf *p; |
mbed_official | 0:51ac1d130fd4 | 1123 | err_t result = ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1124 | struct eth_hdr *ethhdr; |
mbed_official | 0:51ac1d130fd4 | 1125 | struct etharp_hdr *hdr; |
mbed_official | 0:51ac1d130fd4 | 1126 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 1127 | const u8_t * ethdst_hwaddr; |
mbed_official | 0:51ac1d130fd4 | 1128 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 1129 | |
mbed_official | 0:51ac1d130fd4 | 1130 | /* allocate a pbuf for the outgoing ARP request packet */ |
mbed_official | 0:51ac1d130fd4 | 1131 | p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM); |
mbed_official | 0:51ac1d130fd4 | 1132 | /* could allocate a pbuf for an ARP request? */ |
mbed_official | 0:51ac1d130fd4 | 1133 | if (p == NULL) { |
mbed_official | 0:51ac1d130fd4 | 1134 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, |
mbed_official | 0:51ac1d130fd4 | 1135 | ("etharp_raw: could not allocate pbuf for ARP request.\n")); |
mbed_official | 0:51ac1d130fd4 | 1136 | ETHARP_STATS_INC(etharp.memerr); |
mbed_official | 0:51ac1d130fd4 | 1137 | return ERR_MEM; |
mbed_official | 0:51ac1d130fd4 | 1138 | } |
mbed_official | 0:51ac1d130fd4 | 1139 | LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr", |
mbed_official | 0:51ac1d130fd4 | 1140 | (p->len >= SIZEOF_ETHARP_PACKET)); |
mbed_official | 0:51ac1d130fd4 | 1141 | |
mbed_official | 0:51ac1d130fd4 | 1142 | ethhdr = (struct eth_hdr *)p->payload; |
mbed_official | 0:51ac1d130fd4 | 1143 | hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR); |
mbed_official | 0:51ac1d130fd4 | 1144 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n")); |
mbed_official | 0:51ac1d130fd4 | 1145 | hdr->opcode = htons(opcode); |
mbed_official | 0:51ac1d130fd4 | 1146 | |
mbed_official | 0:51ac1d130fd4 | 1147 | LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!", |
mbed_official | 0:51ac1d130fd4 | 1148 | (netif->hwaddr_len == ETHARP_HWADDR_LEN)); |
mbed_official | 0:51ac1d130fd4 | 1149 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 1150 | /* If we are using Link-Local, all ARP packets that contain a Link-Local |
mbed_official | 0:51ac1d130fd4 | 1151 | * 'sender IP address' MUST be sent using link-layer broadcast instead of |
mbed_official | 0:51ac1d130fd4 | 1152 | * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */ |
mbed_official | 0:51ac1d130fd4 | 1153 | ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr; |
mbed_official | 0:51ac1d130fd4 | 1154 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 1155 | /* Write the ARP MAC-Addresses */ |
mbed_official | 0:51ac1d130fd4 | 1156 | ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr); |
mbed_official | 0:51ac1d130fd4 | 1157 | ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr); |
mbed_official | 0:51ac1d130fd4 | 1158 | /* Write the Ethernet MAC-Addresses */ |
mbed_official | 0:51ac1d130fd4 | 1159 | #if LWIP_AUTOIP |
mbed_official | 0:51ac1d130fd4 | 1160 | ETHADDR16_COPY(ðhdr->dest, ethdst_hwaddr); |
mbed_official | 0:51ac1d130fd4 | 1161 | #else /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 1162 | ETHADDR16_COPY(ðhdr->dest, ethdst_addr); |
mbed_official | 0:51ac1d130fd4 | 1163 | #endif /* LWIP_AUTOIP */ |
mbed_official | 0:51ac1d130fd4 | 1164 | ETHADDR16_COPY(ðhdr->src, ethsrc_addr); |
mbed_official | 0:51ac1d130fd4 | 1165 | /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without |
mbed_official | 0:51ac1d130fd4 | 1166 | * structure packing. */ |
mbed_official | 0:51ac1d130fd4 | 1167 | IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr); |
mbed_official | 0:51ac1d130fd4 | 1168 | IPADDR2_COPY(&hdr->dipaddr, ipdst_addr); |
mbed_official | 0:51ac1d130fd4 | 1169 | |
mbed_official | 0:51ac1d130fd4 | 1170 | hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET); |
mbed_official | 0:51ac1d130fd4 | 1171 | hdr->proto = PP_HTONS(ETHTYPE_IP); |
mbed_official | 0:51ac1d130fd4 | 1172 | /* set hwlen and protolen */ |
mbed_official | 0:51ac1d130fd4 | 1173 | hdr->hwlen = ETHARP_HWADDR_LEN; |
mbed_official | 0:51ac1d130fd4 | 1174 | hdr->protolen = sizeof(ip_addr_t); |
mbed_official | 0:51ac1d130fd4 | 1175 | |
mbed_official | 0:51ac1d130fd4 | 1176 | ethhdr->type = PP_HTONS(ETHTYPE_ARP); |
mbed_official | 0:51ac1d130fd4 | 1177 | /* send ARP query */ |
mbed_official | 0:51ac1d130fd4 | 1178 | result = netif->linkoutput(netif, p); |
mbed_official | 0:51ac1d130fd4 | 1179 | ETHARP_STATS_INC(etharp.xmit); |
mbed_official | 0:51ac1d130fd4 | 1180 | /* free ARP query packet */ |
mbed_official | 0:51ac1d130fd4 | 1181 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 1182 | p = NULL; |
mbed_official | 0:51ac1d130fd4 | 1183 | /* could not allocate pbuf for ARP request */ |
mbed_official | 0:51ac1d130fd4 | 1184 | |
mbed_official | 0:51ac1d130fd4 | 1185 | return result; |
mbed_official | 0:51ac1d130fd4 | 1186 | } |
mbed_official | 0:51ac1d130fd4 | 1187 | |
mbed_official | 0:51ac1d130fd4 | 1188 | /** |
mbed_official | 0:51ac1d130fd4 | 1189 | * Send an ARP request packet asking for ipaddr. |
mbed_official | 0:51ac1d130fd4 | 1190 | * |
mbed_official | 0:51ac1d130fd4 | 1191 | * @param netif the lwip network interface on which to send the request |
mbed_official | 0:51ac1d130fd4 | 1192 | * @param ipaddr the IP address for which to ask |
mbed_official | 0:51ac1d130fd4 | 1193 | * @return ERR_OK if the request has been sent |
mbed_official | 0:51ac1d130fd4 | 1194 | * ERR_MEM if the ARP packet couldn't be allocated |
mbed_official | 0:51ac1d130fd4 | 1195 | * any other err_t on failure |
mbed_official | 0:51ac1d130fd4 | 1196 | */ |
mbed_official | 0:51ac1d130fd4 | 1197 | err_t |
mbed_official | 0:51ac1d130fd4 | 1198 | etharp_request(struct netif *netif, ip_addr_t *ipaddr) |
mbed_official | 0:51ac1d130fd4 | 1199 | { |
mbed_official | 0:51ac1d130fd4 | 1200 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n")); |
mbed_official | 0:51ac1d130fd4 | 1201 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
mbed_official | 0:51ac1d130fd4 | 1202 | (struct eth_addr *)netif->hwaddr, &netif->ip_addr, ðzero, |
mbed_official | 0:51ac1d130fd4 | 1203 | ipaddr, ARP_REQUEST); |
mbed_official | 0:51ac1d130fd4 | 1204 | } |
mbed_official | 0:51ac1d130fd4 | 1205 | #endif /* LWIP_ARP */ |
mbed_official | 0:51ac1d130fd4 | 1206 | |
mbed_official | 0:51ac1d130fd4 | 1207 | /** |
mbed_official | 0:51ac1d130fd4 | 1208 | * Process received ethernet frames. Using this function instead of directly |
mbed_official | 0:51ac1d130fd4 | 1209 | * calling ip_input and passing ARP frames through etharp in ethernetif_input, |
mbed_official | 0:51ac1d130fd4 | 1210 | * the ARP cache is protected from concurrent access. |
mbed_official | 0:51ac1d130fd4 | 1211 | * |
mbed_official | 0:51ac1d130fd4 | 1212 | * @param p the recevied packet, p->payload pointing to the ethernet header |
mbed_official | 0:51ac1d130fd4 | 1213 | * @param netif the network interface on which the packet was received |
mbed_official | 0:51ac1d130fd4 | 1214 | */ |
mbed_official | 0:51ac1d130fd4 | 1215 | err_t |
mbed_official | 0:51ac1d130fd4 | 1216 | ethernet_input(struct pbuf *p, struct netif *netif) |
mbed_official | 0:51ac1d130fd4 | 1217 | { |
mbed_official | 0:51ac1d130fd4 | 1218 | struct eth_hdr* ethhdr; |
mbed_official | 0:51ac1d130fd4 | 1219 | u16_t type; |
mbed_official | 0:51ac1d130fd4 | 1220 | s16_t ip_hdr_offset = SIZEOF_ETH_HDR; |
mbed_official | 0:51ac1d130fd4 | 1221 | |
mbed_official | 0:51ac1d130fd4 | 1222 | if (p->len <= SIZEOF_ETH_HDR) { |
mbed_official | 0:51ac1d130fd4 | 1223 | /* a packet with only an ethernet header (or less) is not valid for us */ |
mbed_official | 0:51ac1d130fd4 | 1224 | ETHARP_STATS_INC(etharp.proterr); |
mbed_official | 0:51ac1d130fd4 | 1225 | ETHARP_STATS_INC(etharp.drop); |
mbed_official | 0:51ac1d130fd4 | 1226 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1227 | } |
mbed_official | 0:51ac1d130fd4 | 1228 | |
mbed_official | 0:51ac1d130fd4 | 1229 | /* points to packet payload, which starts with an Ethernet header */ |
mbed_official | 0:51ac1d130fd4 | 1230 | ethhdr = (struct eth_hdr *)p->payload; |
mbed_official | 0:51ac1d130fd4 | 1231 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, |
mbed_official | 0:51ac1d130fd4 | 1232 | ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n", |
mbed_official | 0:51ac1d130fd4 | 1233 | (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2], |
mbed_official | 0:51ac1d130fd4 | 1234 | (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5], |
mbed_official | 0:51ac1d130fd4 | 1235 | (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2], |
mbed_official | 0:51ac1d130fd4 | 1236 | (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5], |
mbed_official | 0:51ac1d130fd4 | 1237 | (unsigned)htons(ethhdr->type))); |
mbed_official | 0:51ac1d130fd4 | 1238 | |
mbed_official | 0:51ac1d130fd4 | 1239 | type = ethhdr->type; |
mbed_official | 0:51ac1d130fd4 | 1240 | #if ETHARP_SUPPORT_VLAN |
mbed_official | 0:51ac1d130fd4 | 1241 | if (type == PP_HTONS(ETHTYPE_VLAN)) { |
mbed_official | 0:51ac1d130fd4 | 1242 | struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR); |
mbed_official | 0:51ac1d130fd4 | 1243 | if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) { |
mbed_official | 0:51ac1d130fd4 | 1244 | /* a packet with only an ethernet/vlan header (or less) is not valid for us */ |
mbed_official | 0:51ac1d130fd4 | 1245 | ETHARP_STATS_INC(etharp.proterr); |
mbed_official | 0:51ac1d130fd4 | 1246 | ETHARP_STATS_INC(etharp.drop); |
mbed_official | 0:51ac1d130fd4 | 1247 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1248 | } |
mbed_official | 0:51ac1d130fd4 | 1249 | #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */ |
mbed_official | 0:51ac1d130fd4 | 1250 | if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) { |
mbed_official | 0:51ac1d130fd4 | 1251 | /* silently ignore this packet: not for our VLAN */ |
mbed_official | 0:51ac1d130fd4 | 1252 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 1253 | return ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1254 | } |
mbed_official | 0:51ac1d130fd4 | 1255 | #endif /* ETHARP_VLAN_CHECK */ |
mbed_official | 0:51ac1d130fd4 | 1256 | type = vlan->tpid; |
mbed_official | 0:51ac1d130fd4 | 1257 | ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR; |
mbed_official | 0:51ac1d130fd4 | 1258 | } |
mbed_official | 0:51ac1d130fd4 | 1259 | #endif /* ETHARP_SUPPORT_VLAN */ |
mbed_official | 0:51ac1d130fd4 | 1260 | |
mbed_official | 0:51ac1d130fd4 | 1261 | #if LWIP_ARP_FILTER_NETIF |
mbed_official | 0:51ac1d130fd4 | 1262 | netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type)); |
mbed_official | 0:51ac1d130fd4 | 1263 | #endif /* LWIP_ARP_FILTER_NETIF*/ |
mbed_official | 0:51ac1d130fd4 | 1264 | |
mbed_official | 0:51ac1d130fd4 | 1265 | switch (type) { |
mbed_official | 0:51ac1d130fd4 | 1266 | #if LWIP_ARP |
mbed_official | 0:51ac1d130fd4 | 1267 | /* IP packet? */ |
mbed_official | 0:51ac1d130fd4 | 1268 | case PP_HTONS(ETHTYPE_IP): |
mbed_official | 0:51ac1d130fd4 | 1269 | if (!(netif->flags & NETIF_FLAG_ETHARP)) { |
mbed_official | 0:51ac1d130fd4 | 1270 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1271 | } |
mbed_official | 0:51ac1d130fd4 | 1272 | #if ETHARP_TRUST_IP_MAC |
mbed_official | 0:51ac1d130fd4 | 1273 | /* update ARP table */ |
mbed_official | 0:51ac1d130fd4 | 1274 | etharp_ip_input(netif, p); |
mbed_official | 0:51ac1d130fd4 | 1275 | #endif /* ETHARP_TRUST_IP_MAC */ |
mbed_official | 0:51ac1d130fd4 | 1276 | /* skip Ethernet header */ |
mbed_official | 0:51ac1d130fd4 | 1277 | if(pbuf_header(p, -ip_hdr_offset)) { |
mbed_official | 0:51ac1d130fd4 | 1278 | LWIP_ASSERT("Can't move over header in packet", 0); |
mbed_official | 0:51ac1d130fd4 | 1279 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1280 | } else { |
mbed_official | 0:51ac1d130fd4 | 1281 | /* pass to IP layer */ |
mbed_official | 0:51ac1d130fd4 | 1282 | ip_input(p, netif); |
mbed_official | 0:51ac1d130fd4 | 1283 | } |
mbed_official | 0:51ac1d130fd4 | 1284 | break; |
mbed_official | 0:51ac1d130fd4 | 1285 | |
mbed_official | 0:51ac1d130fd4 | 1286 | case PP_HTONS(ETHTYPE_ARP): |
mbed_official | 0:51ac1d130fd4 | 1287 | if (!(netif->flags & NETIF_FLAG_ETHARP)) { |
mbed_official | 0:51ac1d130fd4 | 1288 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1289 | } |
mbed_official | 0:51ac1d130fd4 | 1290 | /* pass p to ARP module */ |
mbed_official | 0:51ac1d130fd4 | 1291 | etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p); |
mbed_official | 0:51ac1d130fd4 | 1292 | break; |
mbed_official | 0:51ac1d130fd4 | 1293 | #endif /* LWIP_ARP */ |
mbed_official | 0:51ac1d130fd4 | 1294 | #if PPPOE_SUPPORT |
mbed_official | 0:51ac1d130fd4 | 1295 | case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */ |
mbed_official | 0:51ac1d130fd4 | 1296 | pppoe_disc_input(netif, p); |
mbed_official | 0:51ac1d130fd4 | 1297 | break; |
mbed_official | 0:51ac1d130fd4 | 1298 | |
mbed_official | 0:51ac1d130fd4 | 1299 | case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */ |
mbed_official | 0:51ac1d130fd4 | 1300 | pppoe_data_input(netif, p); |
mbed_official | 0:51ac1d130fd4 | 1301 | break; |
mbed_official | 0:51ac1d130fd4 | 1302 | #endif /* PPPOE_SUPPORT */ |
mbed_official | 0:51ac1d130fd4 | 1303 | |
mbed_official | 0:51ac1d130fd4 | 1304 | default: |
mbed_official | 0:51ac1d130fd4 | 1305 | ETHARP_STATS_INC(etharp.proterr); |
mbed_official | 0:51ac1d130fd4 | 1306 | ETHARP_STATS_INC(etharp.drop); |
mbed_official | 0:51ac1d130fd4 | 1307 | goto free_and_return; |
mbed_official | 0:51ac1d130fd4 | 1308 | } |
mbed_official | 0:51ac1d130fd4 | 1309 | |
mbed_official | 0:51ac1d130fd4 | 1310 | /* This means the pbuf is freed or consumed, |
mbed_official | 0:51ac1d130fd4 | 1311 | so the caller doesn't have to free it again */ |
mbed_official | 0:51ac1d130fd4 | 1312 | return ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1313 | |
mbed_official | 0:51ac1d130fd4 | 1314 | free_and_return: |
mbed_official | 0:51ac1d130fd4 | 1315 | pbuf_free(p); |
mbed_official | 0:51ac1d130fd4 | 1316 | return ERR_OK; |
mbed_official | 0:51ac1d130fd4 | 1317 | } |
mbed_official | 0:51ac1d130fd4 | 1318 | #endif /* LWIP_ARP || LWIP_ETHERNET */ |