Pehr Hovey
Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
Core/lwIP/core/ipv4/ip.c@0:a548a085de55, 2010-03-14 (annotated)
- Committer:
- pehrhovey
- Date:
- Sun Mar 14 00:54:12 2010 +0000
- Revision:
- 0:a548a085de55
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pehrhovey | 0:a548a085de55 | 1 | /** |
| pehrhovey | 0:a548a085de55 | 2 | * @file |
| pehrhovey | 0:a548a085de55 | 3 | * This is the IPv4 layer implementation for incoming and outgoing IP traffic. |
| pehrhovey | 0:a548a085de55 | 4 | * |
| pehrhovey | 0:a548a085de55 | 5 | * @see ip_frag.c |
| pehrhovey | 0:a548a085de55 | 6 | * |
| pehrhovey | 0:a548a085de55 | 7 | */ |
| pehrhovey | 0:a548a085de55 | 8 | |
| pehrhovey | 0:a548a085de55 | 9 | /* |
| pehrhovey | 0:a548a085de55 | 10 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| pehrhovey | 0:a548a085de55 | 11 | * All rights reserved. |
| pehrhovey | 0:a548a085de55 | 12 | * |
| pehrhovey | 0:a548a085de55 | 13 | * Redistribution and use in source and binary forms, with or without modification, |
| pehrhovey | 0:a548a085de55 | 14 | * are permitted provided that the following conditions are met: |
| pehrhovey | 0:a548a085de55 | 15 | * |
| pehrhovey | 0:a548a085de55 | 16 | * 1. Redistributions of source code must retain the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 17 | * this list of conditions and the following disclaimer. |
| pehrhovey | 0:a548a085de55 | 18 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 19 | * this list of conditions and the following disclaimer in the documentation |
| pehrhovey | 0:a548a085de55 | 20 | * and/or other materials provided with the distribution. |
| pehrhovey | 0:a548a085de55 | 21 | * 3. The name of the author may not be used to endorse or promote products |
| pehrhovey | 0:a548a085de55 | 22 | * derived from this software without specific prior written permission. |
| pehrhovey | 0:a548a085de55 | 23 | * |
| pehrhovey | 0:a548a085de55 | 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| pehrhovey | 0:a548a085de55 | 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| pehrhovey | 0:a548a085de55 | 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| pehrhovey | 0:a548a085de55 | 27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| pehrhovey | 0:a548a085de55 | 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| pehrhovey | 0:a548a085de55 | 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| pehrhovey | 0:a548a085de55 | 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| pehrhovey | 0:a548a085de55 | 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| pehrhovey | 0:a548a085de55 | 32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| pehrhovey | 0:a548a085de55 | 33 | * OF SUCH DAMAGE. |
| pehrhovey | 0:a548a085de55 | 34 | * |
| pehrhovey | 0:a548a085de55 | 35 | * This file is part of the lwIP TCP/IP stack. |
| pehrhovey | 0:a548a085de55 | 36 | * |
| pehrhovey | 0:a548a085de55 | 37 | * Author: Adam Dunkels <adam@sics.se> |
| pehrhovey | 0:a548a085de55 | 38 | * |
| pehrhovey | 0:a548a085de55 | 39 | */ |
| pehrhovey | 0:a548a085de55 | 40 | |
| pehrhovey | 0:a548a085de55 | 41 | #include "lwip/opt.h" |
| pehrhovey | 0:a548a085de55 | 42 | #include "lwip/ip.h" |
| pehrhovey | 0:a548a085de55 | 43 | #include "lwip/def.h" |
| pehrhovey | 0:a548a085de55 | 44 | #include "lwip/mem.h" |
| pehrhovey | 0:a548a085de55 | 45 | #include "lwip/ip_frag.h" |
| pehrhovey | 0:a548a085de55 | 46 | #include "lwip/inet.h" |
| pehrhovey | 0:a548a085de55 | 47 | #include "lwip/inet_chksum.h" |
| pehrhovey | 0:a548a085de55 | 48 | #include "lwip/netif.h" |
| pehrhovey | 0:a548a085de55 | 49 | #include "lwip/icmp.h" |
| pehrhovey | 0:a548a085de55 | 50 | #include "lwip/igmp.h" |
| pehrhovey | 0:a548a085de55 | 51 | #include "lwip/raw.h" |
| pehrhovey | 0:a548a085de55 | 52 | #include "lwip/udp.h" |
| pehrhovey | 0:a548a085de55 | 53 | #include "lwip/tcp.h" |
| pehrhovey | 0:a548a085de55 | 54 | #include "lwip/snmp.h" |
| pehrhovey | 0:a548a085de55 | 55 | #include "lwip/dhcp.h" |
| pehrhovey | 0:a548a085de55 | 56 | #include "lwip/stats.h" |
| pehrhovey | 0:a548a085de55 | 57 | #include "arch/perf.h" |
| pehrhovey | 0:a548a085de55 | 58 | |
| pehrhovey | 0:a548a085de55 | 59 | #include <string.h> |
| pehrhovey | 0:a548a085de55 | 60 | |
| pehrhovey | 0:a548a085de55 | 61 | /** |
| pehrhovey | 0:a548a085de55 | 62 | * The interface that provided the packet for the current callback |
| pehrhovey | 0:a548a085de55 | 63 | * invocation. |
| pehrhovey | 0:a548a085de55 | 64 | */ |
| pehrhovey | 0:a548a085de55 | 65 | struct netif *current_netif; |
| pehrhovey | 0:a548a085de55 | 66 | |
| pehrhovey | 0:a548a085de55 | 67 | /** |
| pehrhovey | 0:a548a085de55 | 68 | * Header of the input packet currently being processed. |
| pehrhovey | 0:a548a085de55 | 69 | */ |
| pehrhovey | 0:a548a085de55 | 70 | const struct ip_hdr *current_header; |
| pehrhovey | 0:a548a085de55 | 71 | |
| pehrhovey | 0:a548a085de55 | 72 | /** |
| pehrhovey | 0:a548a085de55 | 73 | * Finds the appropriate network interface for a given IP address. It |
| pehrhovey | 0:a548a085de55 | 74 | * searches the list of network interfaces linearly. A match is found |
| pehrhovey | 0:a548a085de55 | 75 | * if the masked IP address of the network interface equals the masked |
| pehrhovey | 0:a548a085de55 | 76 | * IP address given to the function. |
| pehrhovey | 0:a548a085de55 | 77 | * |
| pehrhovey | 0:a548a085de55 | 78 | * @param dest the destination IP address for which to find the route |
| pehrhovey | 0:a548a085de55 | 79 | * @return the netif on which to send to reach dest |
| pehrhovey | 0:a548a085de55 | 80 | */ |
| pehrhovey | 0:a548a085de55 | 81 | struct netif * |
| pehrhovey | 0:a548a085de55 | 82 | ip_route(struct ip_addr *dest) |
| pehrhovey | 0:a548a085de55 | 83 | { |
| pehrhovey | 0:a548a085de55 | 84 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 85 | |
| pehrhovey | 0:a548a085de55 | 86 | /* iterate through netifs */ |
| pehrhovey | 0:a548a085de55 | 87 | for(netif = netif_list; netif != NULL; netif = netif->next) { |
| pehrhovey | 0:a548a085de55 | 88 | /* network mask matches? */ |
| pehrhovey | 0:a548a085de55 | 89 | if (netif_is_up(netif)) { |
| pehrhovey | 0:a548a085de55 | 90 | if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) { |
| pehrhovey | 0:a548a085de55 | 91 | /* return netif on which to forward IP packet */ |
| pehrhovey | 0:a548a085de55 | 92 | return netif; |
| pehrhovey | 0:a548a085de55 | 93 | } |
| pehrhovey | 0:a548a085de55 | 94 | } |
| pehrhovey | 0:a548a085de55 | 95 | } |
| pehrhovey | 0:a548a085de55 | 96 | if ((netif_default == NULL) || (!netif_is_up(netif_default))) { |
| pehrhovey | 0:a548a085de55 | 97 | LWIP_DEBUGF(IP_DEBUG | 2, ("ip_route: No route to 0x%"X32_F"\n", dest->addr)); |
| pehrhovey | 0:a548a085de55 | 98 | IP_STATS_INC(ip.rterr); |
| pehrhovey | 0:a548a085de55 | 99 | snmp_inc_ipoutnoroutes(); |
| pehrhovey | 0:a548a085de55 | 100 | return NULL; |
| pehrhovey | 0:a548a085de55 | 101 | } |
| pehrhovey | 0:a548a085de55 | 102 | /* no matching netif found, use default netif */ |
| pehrhovey | 0:a548a085de55 | 103 | return netif_default; |
| pehrhovey | 0:a548a085de55 | 104 | } |
| pehrhovey | 0:a548a085de55 | 105 | |
| pehrhovey | 0:a548a085de55 | 106 | #if IP_FORWARD |
| pehrhovey | 0:a548a085de55 | 107 | /** |
| pehrhovey | 0:a548a085de55 | 108 | * Forwards an IP packet. It finds an appropriate route for the |
| pehrhovey | 0:a548a085de55 | 109 | * packet, decrements the TTL value of the packet, adjusts the |
| pehrhovey | 0:a548a085de55 | 110 | * checksum and outputs the packet on the appropriate interface. |
| pehrhovey | 0:a548a085de55 | 111 | * |
| pehrhovey | 0:a548a085de55 | 112 | * @param p the packet to forward (p->payload points to IP header) |
| pehrhovey | 0:a548a085de55 | 113 | * @param iphdr the IP header of the input packet |
| pehrhovey | 0:a548a085de55 | 114 | * @param inp the netif on which this packet was received |
| pehrhovey | 0:a548a085de55 | 115 | * @return the netif on which the packet was sent (NULL if it wasn't sent) |
| pehrhovey | 0:a548a085de55 | 116 | */ |
| pehrhovey | 0:a548a085de55 | 117 | static struct netif * |
| pehrhovey | 0:a548a085de55 | 118 | ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp) |
| pehrhovey | 0:a548a085de55 | 119 | { |
| pehrhovey | 0:a548a085de55 | 120 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 121 | |
| pehrhovey | 0:a548a085de55 | 122 | PERF_START; |
| pehrhovey | 0:a548a085de55 | 123 | /* Find network interface where to forward this IP packet to. */ |
| pehrhovey | 0:a548a085de55 | 124 | netif = ip_route((struct ip_addr *)&(iphdr->dest)); |
| pehrhovey | 0:a548a085de55 | 125 | if (netif == NULL) { |
| pehrhovey | 0:a548a085de55 | 126 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%"X32_F" found\n", |
| pehrhovey | 0:a548a085de55 | 127 | iphdr->dest.addr)); |
| pehrhovey | 0:a548a085de55 | 128 | snmp_inc_ipoutnoroutes(); |
| pehrhovey | 0:a548a085de55 | 129 | return (struct netif *)NULL; |
| pehrhovey | 0:a548a085de55 | 130 | } |
| pehrhovey | 0:a548a085de55 | 131 | /* Do not forward packets onto the same network interface on which |
| pehrhovey | 0:a548a085de55 | 132 | * they arrived. */ |
| pehrhovey | 0:a548a085de55 | 133 | if (netif == inp) { |
| pehrhovey | 0:a548a085de55 | 134 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n")); |
| pehrhovey | 0:a548a085de55 | 135 | snmp_inc_ipoutnoroutes(); |
| pehrhovey | 0:a548a085de55 | 136 | return (struct netif *)NULL; |
| pehrhovey | 0:a548a085de55 | 137 | } |
| pehrhovey | 0:a548a085de55 | 138 | |
| pehrhovey | 0:a548a085de55 | 139 | /* decrement TTL */ |
| pehrhovey | 0:a548a085de55 | 140 | IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1); |
| pehrhovey | 0:a548a085de55 | 141 | /* send ICMP if TTL == 0 */ |
| pehrhovey | 0:a548a085de55 | 142 | if (IPH_TTL(iphdr) == 0) { |
| pehrhovey | 0:a548a085de55 | 143 | snmp_inc_ipinhdrerrors(); |
| pehrhovey | 0:a548a085de55 | 144 | #if LWIP_ICMP |
| pehrhovey | 0:a548a085de55 | 145 | /* Don't send ICMP messages in response to ICMP messages */ |
| pehrhovey | 0:a548a085de55 | 146 | if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) { |
| pehrhovey | 0:a548a085de55 | 147 | icmp_time_exceeded(p, ICMP_TE_TTL); |
| pehrhovey | 0:a548a085de55 | 148 | } |
| pehrhovey | 0:a548a085de55 | 149 | #endif /* LWIP_ICMP */ |
| pehrhovey | 0:a548a085de55 | 150 | return (struct netif *)NULL; |
| pehrhovey | 0:a548a085de55 | 151 | } |
| pehrhovey | 0:a548a085de55 | 152 | |
| pehrhovey | 0:a548a085de55 | 153 | /* Incrementally update the IP checksum. */ |
| pehrhovey | 0:a548a085de55 | 154 | if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) { |
| pehrhovey | 0:a548a085de55 | 155 | IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1); |
| pehrhovey | 0:a548a085de55 | 156 | } else { |
| pehrhovey | 0:a548a085de55 | 157 | IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100)); |
| pehrhovey | 0:a548a085de55 | 158 | } |
| pehrhovey | 0:a548a085de55 | 159 | |
| pehrhovey | 0:a548a085de55 | 160 | LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to 0x%"X32_F"\n", |
| pehrhovey | 0:a548a085de55 | 161 | iphdr->dest.addr)); |
| pehrhovey | 0:a548a085de55 | 162 | |
| pehrhovey | 0:a548a085de55 | 163 | IP_STATS_INC(ip.fw); |
| pehrhovey | 0:a548a085de55 | 164 | IP_STATS_INC(ip.xmit); |
| pehrhovey | 0:a548a085de55 | 165 | snmp_inc_ipforwdatagrams(); |
| pehrhovey | 0:a548a085de55 | 166 | |
| pehrhovey | 0:a548a085de55 | 167 | PERF_STOP("ip_forward"); |
| pehrhovey | 0:a548a085de55 | 168 | /* transmit pbuf on chosen interface */ |
| pehrhovey | 0:a548a085de55 | 169 | netif->output(netif, p, (struct ip_addr *)&(iphdr->dest)); |
| pehrhovey | 0:a548a085de55 | 170 | return netif; |
| pehrhovey | 0:a548a085de55 | 171 | } |
| pehrhovey | 0:a548a085de55 | 172 | #endif /* IP_FORWARD */ |
| pehrhovey | 0:a548a085de55 | 173 | |
| pehrhovey | 0:a548a085de55 | 174 | /** |
| pehrhovey | 0:a548a085de55 | 175 | * This function is called by the network interface device driver when |
| pehrhovey | 0:a548a085de55 | 176 | * an IP packet is received. The function does the basic checks of the |
| pehrhovey | 0:a548a085de55 | 177 | * IP header such as packet size being at least larger than the header |
| pehrhovey | 0:a548a085de55 | 178 | * size etc. If the packet was not destined for us, the packet is |
| pehrhovey | 0:a548a085de55 | 179 | * forwarded (using ip_forward). The IP checksum is always checked. |
| pehrhovey | 0:a548a085de55 | 180 | * |
| pehrhovey | 0:a548a085de55 | 181 | * Finally, the packet is sent to the upper layer protocol input function. |
| pehrhovey | 0:a548a085de55 | 182 | * |
| pehrhovey | 0:a548a085de55 | 183 | * @param p the received IP packet (p->payload points to IP header) |
| pehrhovey | 0:a548a085de55 | 184 | * @param inp the netif on which this packet was received |
| pehrhovey | 0:a548a085de55 | 185 | * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't |
| pehrhovey | 0:a548a085de55 | 186 | * processed, but currently always returns ERR_OK) |
| pehrhovey | 0:a548a085de55 | 187 | */ |
| pehrhovey | 0:a548a085de55 | 188 | err_t |
| pehrhovey | 0:a548a085de55 | 189 | ip_input(struct pbuf *p, struct netif *inp) |
| pehrhovey | 0:a548a085de55 | 190 | { |
| pehrhovey | 0:a548a085de55 | 191 | struct ip_hdr *iphdr; |
| pehrhovey | 0:a548a085de55 | 192 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 193 | u16_t iphdr_hlen; |
| pehrhovey | 0:a548a085de55 | 194 | u16_t iphdr_len; |
| pehrhovey | 0:a548a085de55 | 195 | #if LWIP_DHCP |
| pehrhovey | 0:a548a085de55 | 196 | int check_ip_src=1; |
| pehrhovey | 0:a548a085de55 | 197 | #endif /* LWIP_DHCP */ |
| pehrhovey | 0:a548a085de55 | 198 | |
| pehrhovey | 0:a548a085de55 | 199 | IP_STATS_INC(ip.recv); |
| pehrhovey | 0:a548a085de55 | 200 | snmp_inc_ipinreceives(); |
| pehrhovey | 0:a548a085de55 | 201 | |
| pehrhovey | 0:a548a085de55 | 202 | /* identify the IP header */ |
| pehrhovey | 0:a548a085de55 | 203 | iphdr = (struct ip_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 204 | if (IPH_V(iphdr) != 4) { |
| pehrhovey | 0:a548a085de55 | 205 | LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr))); |
| pehrhovey | 0:a548a085de55 | 206 | ip_debug_print(p); |
| pehrhovey | 0:a548a085de55 | 207 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 208 | IP_STATS_INC(ip.err); |
| pehrhovey | 0:a548a085de55 | 209 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 210 | snmp_inc_ipinhdrerrors(); |
| pehrhovey | 0:a548a085de55 | 211 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 212 | } |
| pehrhovey | 0:a548a085de55 | 213 | |
| pehrhovey | 0:a548a085de55 | 214 | /* obtain IP header length in number of 32-bit words */ |
| pehrhovey | 0:a548a085de55 | 215 | iphdr_hlen = IPH_HL(iphdr); |
| pehrhovey | 0:a548a085de55 | 216 | /* calculate IP header length in bytes */ |
| pehrhovey | 0:a548a085de55 | 217 | iphdr_hlen *= 4; |
| pehrhovey | 0:a548a085de55 | 218 | /* obtain ip length in bytes */ |
| pehrhovey | 0:a548a085de55 | 219 | iphdr_len = ntohs(IPH_LEN(iphdr)); |
| pehrhovey | 0:a548a085de55 | 220 | |
| pehrhovey | 0:a548a085de55 | 221 | /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */ |
| pehrhovey | 0:a548a085de55 | 222 | if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) { |
| pehrhovey | 0:a548a085de55 | 223 | if (iphdr_hlen > p->len) |
| pehrhovey | 0:a548a085de55 | 224 | LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n", |
| pehrhovey | 0:a548a085de55 | 225 | iphdr_hlen, p->len)); |
| pehrhovey | 0:a548a085de55 | 226 | if (iphdr_len > p->tot_len) |
| pehrhovey | 0:a548a085de55 | 227 | LWIP_DEBUGF(IP_DEBUG | 2, ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), " |
| pehrhovey | 0:a548a085de55 | 228 | "IP packet dropped.\n", |
| pehrhovey | 0:a548a085de55 | 229 | iphdr_len, p->tot_len)); |
| pehrhovey | 0:a548a085de55 | 230 | /* free (drop) packet pbufs */ |
| pehrhovey | 0:a548a085de55 | 231 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 232 | IP_STATS_INC(ip.lenerr); |
| pehrhovey | 0:a548a085de55 | 233 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 234 | snmp_inc_ipindiscards(); |
| pehrhovey | 0:a548a085de55 | 235 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 236 | } |
| pehrhovey | 0:a548a085de55 | 237 | |
| pehrhovey | 0:a548a085de55 | 238 | /* verify checksum */ |
| pehrhovey | 0:a548a085de55 | 239 | #if CHECKSUM_CHECK_IP |
| pehrhovey | 0:a548a085de55 | 240 | if (inet_chksum(iphdr, iphdr_hlen) != 0) { |
| pehrhovey | 0:a548a085de55 | 241 | |
| pehrhovey | 0:a548a085de55 | 242 | LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen))); |
| pehrhovey | 0:a548a085de55 | 243 | ip_debug_print(p); |
| pehrhovey | 0:a548a085de55 | 244 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 245 | IP_STATS_INC(ip.chkerr); |
| pehrhovey | 0:a548a085de55 | 246 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 247 | snmp_inc_ipinhdrerrors(); |
| pehrhovey | 0:a548a085de55 | 248 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 249 | } |
| pehrhovey | 0:a548a085de55 | 250 | #endif |
| pehrhovey | 0:a548a085de55 | 251 | |
| pehrhovey | 0:a548a085de55 | 252 | /* Trim pbuf. This should have been done at the netif layer, |
| pehrhovey | 0:a548a085de55 | 253 | * but we'll do it anyway just to be sure that its done. */ |
| pehrhovey | 0:a548a085de55 | 254 | pbuf_realloc(p, iphdr_len); |
| pehrhovey | 0:a548a085de55 | 255 | |
| pehrhovey | 0:a548a085de55 | 256 | /* match packet against an interface, i.e. is this packet for us? */ |
| pehrhovey | 0:a548a085de55 | 257 | #if LWIP_IGMP |
| pehrhovey | 0:a548a085de55 | 258 | if (ip_addr_ismulticast(&(iphdr->dest))) { |
| pehrhovey | 0:a548a085de55 | 259 | if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) { |
| pehrhovey | 0:a548a085de55 | 260 | netif = inp; |
| pehrhovey | 0:a548a085de55 | 261 | } else { |
| pehrhovey | 0:a548a085de55 | 262 | netif = NULL; |
| pehrhovey | 0:a548a085de55 | 263 | } |
| pehrhovey | 0:a548a085de55 | 264 | } else |
| pehrhovey | 0:a548a085de55 | 265 | #endif /* LWIP_IGMP */ |
| pehrhovey | 0:a548a085de55 | 266 | { |
| pehrhovey | 0:a548a085de55 | 267 | /* start trying with inp. if that's not acceptable, start walking the |
| pehrhovey | 0:a548a085de55 | 268 | list of configured netifs. |
| pehrhovey | 0:a548a085de55 | 269 | 'first' is used as a boolean to mark whether we started walking the list */ |
| pehrhovey | 0:a548a085de55 | 270 | int first = 1; |
| pehrhovey | 0:a548a085de55 | 271 | netif = inp; |
| pehrhovey | 0:a548a085de55 | 272 | do { |
| pehrhovey | 0:a548a085de55 | 273 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n", |
| pehrhovey | 0:a548a085de55 | 274 | iphdr->dest.addr, netif->ip_addr.addr, |
| pehrhovey | 0:a548a085de55 | 275 | iphdr->dest.addr & netif->netmask.addr, |
| pehrhovey | 0:a548a085de55 | 276 | netif->ip_addr.addr & netif->netmask.addr, |
| pehrhovey | 0:a548a085de55 | 277 | iphdr->dest.addr & ~(netif->netmask.addr))); |
| pehrhovey | 0:a548a085de55 | 278 | |
| pehrhovey | 0:a548a085de55 | 279 | /* interface is up and configured? */ |
| pehrhovey | 0:a548a085de55 | 280 | if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) { |
| pehrhovey | 0:a548a085de55 | 281 | /* unicast to this interface address? */ |
| pehrhovey | 0:a548a085de55 | 282 | if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) || |
| pehrhovey | 0:a548a085de55 | 283 | /* or broadcast on this interface network address? */ |
| pehrhovey | 0:a548a085de55 | 284 | ip_addr_isbroadcast(&(iphdr->dest), netif)) { |
| pehrhovey | 0:a548a085de55 | 285 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n", |
| pehrhovey | 0:a548a085de55 | 286 | netif->name[0], netif->name[1])); |
| pehrhovey | 0:a548a085de55 | 287 | /* break out of for loop */ |
| pehrhovey | 0:a548a085de55 | 288 | break; |
| pehrhovey | 0:a548a085de55 | 289 | } |
| pehrhovey | 0:a548a085de55 | 290 | } |
| pehrhovey | 0:a548a085de55 | 291 | if (first) { |
| pehrhovey | 0:a548a085de55 | 292 | first = 0; |
| pehrhovey | 0:a548a085de55 | 293 | netif = netif_list; |
| pehrhovey | 0:a548a085de55 | 294 | } else { |
| pehrhovey | 0:a548a085de55 | 295 | netif = netif->next; |
| pehrhovey | 0:a548a085de55 | 296 | } |
| pehrhovey | 0:a548a085de55 | 297 | if (netif == inp) { |
| pehrhovey | 0:a548a085de55 | 298 | netif = netif->next; |
| pehrhovey | 0:a548a085de55 | 299 | } |
| pehrhovey | 0:a548a085de55 | 300 | } while(netif != NULL); |
| pehrhovey | 0:a548a085de55 | 301 | } |
| pehrhovey | 0:a548a085de55 | 302 | |
| pehrhovey | 0:a548a085de55 | 303 | #if LWIP_DHCP |
| pehrhovey | 0:a548a085de55 | 304 | /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed |
| pehrhovey | 0:a548a085de55 | 305 | * using link layer addressing (such as Ethernet MAC) so we must not filter on IP. |
| pehrhovey | 0:a548a085de55 | 306 | * According to RFC 1542 section 3.1.1, referred by RFC 2131). |
| pehrhovey | 0:a548a085de55 | 307 | */ |
| pehrhovey | 0:a548a085de55 | 308 | if (netif == NULL) { |
| pehrhovey | 0:a548a085de55 | 309 | /* remote port is DHCP server? */ |
| pehrhovey | 0:a548a085de55 | 310 | if (IPH_PROTO(iphdr) == IP_PROTO_UDP) { |
| pehrhovey | 0:a548a085de55 | 311 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n", |
| pehrhovey | 0:a548a085de55 | 312 | ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest))); |
| pehrhovey | 0:a548a085de55 | 313 | if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) { |
| pehrhovey | 0:a548a085de55 | 314 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n")); |
| pehrhovey | 0:a548a085de55 | 315 | netif = inp; |
| pehrhovey | 0:a548a085de55 | 316 | check_ip_src = 0; |
| pehrhovey | 0:a548a085de55 | 317 | } |
| pehrhovey | 0:a548a085de55 | 318 | } |
| pehrhovey | 0:a548a085de55 | 319 | } |
| pehrhovey | 0:a548a085de55 | 320 | #endif /* LWIP_DHCP */ |
| pehrhovey | 0:a548a085de55 | 321 | |
| pehrhovey | 0:a548a085de55 | 322 | /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */ |
| pehrhovey | 0:a548a085de55 | 323 | #if LWIP_DHCP |
| pehrhovey | 0:a548a085de55 | 324 | /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */ |
| pehrhovey | 0:a548a085de55 | 325 | if (check_ip_src && (iphdr->src.addr != 0)) |
| pehrhovey | 0:a548a085de55 | 326 | #endif /* LWIP_DHCP */ |
| pehrhovey | 0:a548a085de55 | 327 | { if ((ip_addr_isbroadcast(&(iphdr->src), inp)) || |
| pehrhovey | 0:a548a085de55 | 328 | (ip_addr_ismulticast(&(iphdr->src)))) { |
| pehrhovey | 0:a548a085de55 | 329 | /* packet source is not valid */ |
| pehrhovey | 0:a548a085de55 | 330 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n")); |
| pehrhovey | 0:a548a085de55 | 331 | /* free (drop) packet pbufs */ |
| pehrhovey | 0:a548a085de55 | 332 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 333 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 334 | snmp_inc_ipinaddrerrors(); |
| pehrhovey | 0:a548a085de55 | 335 | snmp_inc_ipindiscards(); |
| pehrhovey | 0:a548a085de55 | 336 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 337 | } |
| pehrhovey | 0:a548a085de55 | 338 | } |
| pehrhovey | 0:a548a085de55 | 339 | |
| pehrhovey | 0:a548a085de55 | 340 | /* packet not for us? */ |
| pehrhovey | 0:a548a085de55 | 341 | if (netif == NULL) { |
| pehrhovey | 0:a548a085de55 | 342 | /* packet not for us, route or discard */ |
| pehrhovey | 0:a548a085de55 | 343 | LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet not for us.\n")); |
| pehrhovey | 0:a548a085de55 | 344 | #if IP_FORWARD |
| pehrhovey | 0:a548a085de55 | 345 | /* non-broadcast packet? */ |
| pehrhovey | 0:a548a085de55 | 346 | if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) { |
| pehrhovey | 0:a548a085de55 | 347 | /* try to forward IP packet on (other) interfaces */ |
| pehrhovey | 0:a548a085de55 | 348 | ip_forward(p, iphdr, inp); |
| pehrhovey | 0:a548a085de55 | 349 | } else |
| pehrhovey | 0:a548a085de55 | 350 | #endif /* IP_FORWARD */ |
| pehrhovey | 0:a548a085de55 | 351 | { |
| pehrhovey | 0:a548a085de55 | 352 | snmp_inc_ipinaddrerrors(); |
| pehrhovey | 0:a548a085de55 | 353 | snmp_inc_ipindiscards(); |
| pehrhovey | 0:a548a085de55 | 354 | } |
| pehrhovey | 0:a548a085de55 | 355 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 356 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 357 | } |
| pehrhovey | 0:a548a085de55 | 358 | /* packet consists of multiple fragments? */ |
| pehrhovey | 0:a548a085de55 | 359 | if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) { |
| pehrhovey | 0:a548a085de55 | 360 | #if IP_REASSEMBLY /* packet fragment reassembly code present? */ |
| pehrhovey | 0:a548a085de55 | 361 | LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n", |
| pehrhovey | 0:a548a085de55 | 362 | ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8)); |
| pehrhovey | 0:a548a085de55 | 363 | /* reassemble the packet*/ |
| pehrhovey | 0:a548a085de55 | 364 | p = ip_reass(p); |
| pehrhovey | 0:a548a085de55 | 365 | /* packet not fully reassembled yet? */ |
| pehrhovey | 0:a548a085de55 | 366 | if (p == NULL) { |
| pehrhovey | 0:a548a085de55 | 367 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 368 | } |
| pehrhovey | 0:a548a085de55 | 369 | iphdr = (struct ip_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 370 | #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */ |
| pehrhovey | 0:a548a085de55 | 371 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 372 | LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n", |
| pehrhovey | 0:a548a085de55 | 373 | ntohs(IPH_OFFSET(iphdr)))); |
| pehrhovey | 0:a548a085de55 | 374 | IP_STATS_INC(ip.opterr); |
| pehrhovey | 0:a548a085de55 | 375 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 376 | /* unsupported protocol feature */ |
| pehrhovey | 0:a548a085de55 | 377 | snmp_inc_ipinunknownprotos(); |
| pehrhovey | 0:a548a085de55 | 378 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 379 | #endif /* IP_REASSEMBLY */ |
| pehrhovey | 0:a548a085de55 | 380 | } |
| pehrhovey | 0:a548a085de55 | 381 | |
| pehrhovey | 0:a548a085de55 | 382 | #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */ |
| pehrhovey | 0:a548a085de55 | 383 | |
| pehrhovey | 0:a548a085de55 | 384 | #if LWIP_IGMP |
| pehrhovey | 0:a548a085de55 | 385 | /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */ |
| pehrhovey | 0:a548a085de55 | 386 | if((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) { |
| pehrhovey | 0:a548a085de55 | 387 | #else |
| pehrhovey | 0:a548a085de55 | 388 | if (iphdr_hlen > IP_HLEN) { |
| pehrhovey | 0:a548a085de55 | 389 | #endif /* LWIP_IGMP */ |
| pehrhovey | 0:a548a085de55 | 390 | LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n")); |
| pehrhovey | 0:a548a085de55 | 391 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 392 | IP_STATS_INC(ip.opterr); |
| pehrhovey | 0:a548a085de55 | 393 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 394 | /* unsupported protocol feature */ |
| pehrhovey | 0:a548a085de55 | 395 | snmp_inc_ipinunknownprotos(); |
| pehrhovey | 0:a548a085de55 | 396 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 397 | } |
| pehrhovey | 0:a548a085de55 | 398 | #endif /* IP_OPTIONS_ALLOWED == 0 */ |
| pehrhovey | 0:a548a085de55 | 399 | |
| pehrhovey | 0:a548a085de55 | 400 | /* send to upper layers */ |
| pehrhovey | 0:a548a085de55 | 401 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n")); |
| pehrhovey | 0:a548a085de55 | 402 | ip_debug_print(p); |
| pehrhovey | 0:a548a085de55 | 403 | LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len)); |
| pehrhovey | 0:a548a085de55 | 404 | |
| pehrhovey | 0:a548a085de55 | 405 | current_netif = inp; |
| pehrhovey | 0:a548a085de55 | 406 | current_header = iphdr; |
| pehrhovey | 0:a548a085de55 | 407 | |
| pehrhovey | 0:a548a085de55 | 408 | #if LWIP_RAW |
| pehrhovey | 0:a548a085de55 | 409 | /* raw input did not eat the packet? */ |
| pehrhovey | 0:a548a085de55 | 410 | if (raw_input(p, inp) == 0) |
| pehrhovey | 0:a548a085de55 | 411 | #endif /* LWIP_RAW */ |
| pehrhovey | 0:a548a085de55 | 412 | { |
| pehrhovey | 0:a548a085de55 | 413 | |
| pehrhovey | 0:a548a085de55 | 414 | switch (IPH_PROTO(iphdr)) { |
| pehrhovey | 0:a548a085de55 | 415 | #if LWIP_UDP |
| pehrhovey | 0:a548a085de55 | 416 | case IP_PROTO_UDP: |
| pehrhovey | 0:a548a085de55 | 417 | #if LWIP_UDPLITE |
| pehrhovey | 0:a548a085de55 | 418 | case IP_PROTO_UDPLITE: |
| pehrhovey | 0:a548a085de55 | 419 | #endif /* LWIP_UDPLITE */ |
| pehrhovey | 0:a548a085de55 | 420 | snmp_inc_ipindelivers(); |
| pehrhovey | 0:a548a085de55 | 421 | udp_input(p, inp); |
| pehrhovey | 0:a548a085de55 | 422 | break; |
| pehrhovey | 0:a548a085de55 | 423 | #endif /* LWIP_UDP */ |
| pehrhovey | 0:a548a085de55 | 424 | #if LWIP_TCP |
| pehrhovey | 0:a548a085de55 | 425 | case IP_PROTO_TCP: |
| pehrhovey | 0:a548a085de55 | 426 | snmp_inc_ipindelivers(); |
| pehrhovey | 0:a548a085de55 | 427 | tcp_input(p, inp); |
| pehrhovey | 0:a548a085de55 | 428 | break; |
| pehrhovey | 0:a548a085de55 | 429 | #endif /* LWIP_TCP */ |
| pehrhovey | 0:a548a085de55 | 430 | #if LWIP_ICMP |
| pehrhovey | 0:a548a085de55 | 431 | case IP_PROTO_ICMP: |
| pehrhovey | 0:a548a085de55 | 432 | snmp_inc_ipindelivers(); |
| pehrhovey | 0:a548a085de55 | 433 | icmp_input(p, inp); |
| pehrhovey | 0:a548a085de55 | 434 | break; |
| pehrhovey | 0:a548a085de55 | 435 | #endif /* LWIP_ICMP */ |
| pehrhovey | 0:a548a085de55 | 436 | #if LWIP_IGMP |
| pehrhovey | 0:a548a085de55 | 437 | case IP_PROTO_IGMP: |
| pehrhovey | 0:a548a085de55 | 438 | igmp_input(p,inp,&(iphdr->dest)); |
| pehrhovey | 0:a548a085de55 | 439 | break; |
| pehrhovey | 0:a548a085de55 | 440 | #endif /* LWIP_IGMP */ |
| pehrhovey | 0:a548a085de55 | 441 | default: |
| pehrhovey | 0:a548a085de55 | 442 | #if LWIP_ICMP |
| pehrhovey | 0:a548a085de55 | 443 | /* send ICMP destination protocol unreachable unless is was a broadcast */ |
| pehrhovey | 0:a548a085de55 | 444 | if (!ip_addr_isbroadcast(&(iphdr->dest), inp) && |
| pehrhovey | 0:a548a085de55 | 445 | !ip_addr_ismulticast(&(iphdr->dest))) { |
| pehrhovey | 0:a548a085de55 | 446 | p->payload = iphdr; |
| pehrhovey | 0:a548a085de55 | 447 | icmp_dest_unreach(p, ICMP_DUR_PROTO); |
| pehrhovey | 0:a548a085de55 | 448 | } |
| pehrhovey | 0:a548a085de55 | 449 | #endif /* LWIP_ICMP */ |
| pehrhovey | 0:a548a085de55 | 450 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 451 | |
| pehrhovey | 0:a548a085de55 | 452 | LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr))); |
| pehrhovey | 0:a548a085de55 | 453 | |
| pehrhovey | 0:a548a085de55 | 454 | IP_STATS_INC(ip.proterr); |
| pehrhovey | 0:a548a085de55 | 455 | IP_STATS_INC(ip.drop); |
| pehrhovey | 0:a548a085de55 | 456 | snmp_inc_ipinunknownprotos(); |
| pehrhovey | 0:a548a085de55 | 457 | } |
| pehrhovey | 0:a548a085de55 | 458 | } |
| pehrhovey | 0:a548a085de55 | 459 | |
| pehrhovey | 0:a548a085de55 | 460 | current_netif = NULL; |
| pehrhovey | 0:a548a085de55 | 461 | current_header = NULL; |
| pehrhovey | 0:a548a085de55 | 462 | |
| pehrhovey | 0:a548a085de55 | 463 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 464 | } |
| pehrhovey | 0:a548a085de55 | 465 | |
| pehrhovey | 0:a548a085de55 | 466 | /** |
| pehrhovey | 0:a548a085de55 | 467 | * Sends an IP packet on a network interface. This function constructs |
| pehrhovey | 0:a548a085de55 | 468 | * the IP header and calculates the IP header checksum. If the source |
| pehrhovey | 0:a548a085de55 | 469 | * IP address is NULL, the IP address of the outgoing network |
| pehrhovey | 0:a548a085de55 | 470 | * interface is filled in as source address. |
| pehrhovey | 0:a548a085de55 | 471 | * If the destination IP address is IP_HDRINCL, p is assumed to already |
| pehrhovey | 0:a548a085de55 | 472 | * include an IP header and p->payload points to it instead of the data. |
| pehrhovey | 0:a548a085de55 | 473 | * |
| pehrhovey | 0:a548a085de55 | 474 | * @param p the packet to send (p->payload points to the data, e.g. next |
| pehrhovey | 0:a548a085de55 | 475 | protocol header; if dest == IP_HDRINCL, p already includes an IP |
| pehrhovey | 0:a548a085de55 | 476 | header and p->payload points to that IP header) |
| pehrhovey | 0:a548a085de55 | 477 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the |
| pehrhovey | 0:a548a085de55 | 478 | * IP address of the netif used to send is used as source address) |
| pehrhovey | 0:a548a085de55 | 479 | * @param dest the destination IP address to send the packet to |
| pehrhovey | 0:a548a085de55 | 480 | * @param ttl the TTL value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 481 | * @param tos the TOS value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 482 | * @param proto the PROTOCOL to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 483 | * @param netif the netif on which to send this packet |
| pehrhovey | 0:a548a085de55 | 484 | * @return ERR_OK if the packet was sent OK |
| pehrhovey | 0:a548a085de55 | 485 | * ERR_BUF if p doesn't have enough space for IP/LINK headers |
| pehrhovey | 0:a548a085de55 | 486 | * returns errors returned by netif->output |
| pehrhovey | 0:a548a085de55 | 487 | * |
| pehrhovey | 0:a548a085de55 | 488 | * @note ip_id: RFC791 "some host may be able to simply use |
| pehrhovey | 0:a548a085de55 | 489 | * unique identifiers independent of destination" |
| pehrhovey | 0:a548a085de55 | 490 | */ |
| pehrhovey | 0:a548a085de55 | 491 | err_t |
| pehrhovey | 0:a548a085de55 | 492 | ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, |
| pehrhovey | 0:a548a085de55 | 493 | u8_t ttl, u8_t tos, |
| pehrhovey | 0:a548a085de55 | 494 | u8_t proto, struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 495 | { |
| pehrhovey | 0:a548a085de55 | 496 | #if IP_OPTIONS_SEND |
| pehrhovey | 0:a548a085de55 | 497 | return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0); |
| pehrhovey | 0:a548a085de55 | 498 | } |
| pehrhovey | 0:a548a085de55 | 499 | |
| pehrhovey | 0:a548a085de55 | 500 | /** |
| pehrhovey | 0:a548a085de55 | 501 | * Same as ip_output_if() but with the possibility to include IP options: |
| pehrhovey | 0:a548a085de55 | 502 | * |
| pehrhovey | 0:a548a085de55 | 503 | * @ param ip_options pointer to the IP options, copied into the IP header |
| pehrhovey | 0:a548a085de55 | 504 | * @ param optlen length of ip_options |
| pehrhovey | 0:a548a085de55 | 505 | */ |
| pehrhovey | 0:a548a085de55 | 506 | err_t ip_output_if_opt(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, |
| pehrhovey | 0:a548a085de55 | 507 | u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options, |
| pehrhovey | 0:a548a085de55 | 508 | u16_t optlen) |
| pehrhovey | 0:a548a085de55 | 509 | { |
| pehrhovey | 0:a548a085de55 | 510 | #endif /* IP_OPTIONS_SEND */ |
| pehrhovey | 0:a548a085de55 | 511 | struct ip_hdr *iphdr; |
| pehrhovey | 0:a548a085de55 | 512 | static u16_t ip_id = 0; |
| pehrhovey | 0:a548a085de55 | 513 | |
| pehrhovey | 0:a548a085de55 | 514 | snmp_inc_ipoutrequests(); |
| pehrhovey | 0:a548a085de55 | 515 | |
| pehrhovey | 0:a548a085de55 | 516 | /* Should the IP header be generated or is it already included in p? */ |
| pehrhovey | 0:a548a085de55 | 517 | if (dest != IP_HDRINCL) { |
| pehrhovey | 0:a548a085de55 | 518 | u16_t ip_hlen = IP_HLEN; |
| pehrhovey | 0:a548a085de55 | 519 | #if IP_OPTIONS_SEND |
| pehrhovey | 0:a548a085de55 | 520 | u16_t optlen_aligned = 0; |
| pehrhovey | 0:a548a085de55 | 521 | if (optlen != 0) { |
| pehrhovey | 0:a548a085de55 | 522 | /* round up to a multiple of 4 */ |
| pehrhovey | 0:a548a085de55 | 523 | optlen_aligned = ((optlen + 3) & ~3); |
| pehrhovey | 0:a548a085de55 | 524 | ip_hlen += optlen_aligned; |
| pehrhovey | 0:a548a085de55 | 525 | /* First write in the IP options */ |
| pehrhovey | 0:a548a085de55 | 526 | if (pbuf_header(p, optlen_aligned)) { |
| pehrhovey | 0:a548a085de55 | 527 | LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output_if_opt: not enough room for IP options in pbuf\n")); |
| pehrhovey | 0:a548a085de55 | 528 | IP_STATS_INC(ip.err); |
| pehrhovey | 0:a548a085de55 | 529 | snmp_inc_ipoutdiscards(); |
| pehrhovey | 0:a548a085de55 | 530 | return ERR_BUF; |
| pehrhovey | 0:a548a085de55 | 531 | } |
| pehrhovey | 0:a548a085de55 | 532 | MEMCPY(p->payload, ip_options, optlen); |
| pehrhovey | 0:a548a085de55 | 533 | if (optlen < optlen_aligned) { |
| pehrhovey | 0:a548a085de55 | 534 | /* zero the remaining bytes */ |
| pehrhovey | 0:a548a085de55 | 535 | memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen); |
| pehrhovey | 0:a548a085de55 | 536 | } |
| pehrhovey | 0:a548a085de55 | 537 | } |
| pehrhovey | 0:a548a085de55 | 538 | #endif /* IP_OPTIONS_SEND */ |
| pehrhovey | 0:a548a085de55 | 539 | /* generate IP header */ |
| pehrhovey | 0:a548a085de55 | 540 | if (pbuf_header(p, IP_HLEN)) { |
| pehrhovey | 0:a548a085de55 | 541 | LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n")); |
| pehrhovey | 0:a548a085de55 | 542 | |
| pehrhovey | 0:a548a085de55 | 543 | IP_STATS_INC(ip.err); |
| pehrhovey | 0:a548a085de55 | 544 | snmp_inc_ipoutdiscards(); |
| pehrhovey | 0:a548a085de55 | 545 | return ERR_BUF; |
| pehrhovey | 0:a548a085de55 | 546 | } |
| pehrhovey | 0:a548a085de55 | 547 | |
| pehrhovey | 0:a548a085de55 | 548 | iphdr = (struct ip_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 549 | LWIP_ASSERT("check that first pbuf can hold struct ip_hdr", |
| pehrhovey | 0:a548a085de55 | 550 | (p->len >= sizeof(struct ip_hdr))); |
| pehrhovey | 0:a548a085de55 | 551 | |
| pehrhovey | 0:a548a085de55 | 552 | IPH_TTL_SET(iphdr, ttl); |
| pehrhovey | 0:a548a085de55 | 553 | IPH_PROTO_SET(iphdr, proto); |
| pehrhovey | 0:a548a085de55 | 554 | |
| pehrhovey | 0:a548a085de55 | 555 | ip_addr_set(&(iphdr->dest), dest); |
| pehrhovey | 0:a548a085de55 | 556 | |
| pehrhovey | 0:a548a085de55 | 557 | IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos); |
| pehrhovey | 0:a548a085de55 | 558 | IPH_LEN_SET(iphdr, htons(p->tot_len)); |
| pehrhovey | 0:a548a085de55 | 559 | IPH_OFFSET_SET(iphdr, 0); |
| pehrhovey | 0:a548a085de55 | 560 | IPH_ID_SET(iphdr, htons(ip_id)); |
| pehrhovey | 0:a548a085de55 | 561 | ++ip_id; |
| pehrhovey | 0:a548a085de55 | 562 | |
| pehrhovey | 0:a548a085de55 | 563 | if (ip_addr_isany(src)) { |
| pehrhovey | 0:a548a085de55 | 564 | ip_addr_set(&(iphdr->src), &(netif->ip_addr)); |
| pehrhovey | 0:a548a085de55 | 565 | } else { |
| pehrhovey | 0:a548a085de55 | 566 | ip_addr_set(&(iphdr->src), src); |
| pehrhovey | 0:a548a085de55 | 567 | } |
| pehrhovey | 0:a548a085de55 | 568 | |
| pehrhovey | 0:a548a085de55 | 569 | IPH_CHKSUM_SET(iphdr, 0); |
| pehrhovey | 0:a548a085de55 | 570 | #if CHECKSUM_GEN_IP |
| pehrhovey | 0:a548a085de55 | 571 | IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen)); |
| pehrhovey | 0:a548a085de55 | 572 | #endif |
| pehrhovey | 0:a548a085de55 | 573 | } else { |
| pehrhovey | 0:a548a085de55 | 574 | /* IP header already included in p */ |
| pehrhovey | 0:a548a085de55 | 575 | iphdr = (struct ip_hdr *)p->payload; |
| pehrhovey | 0:a548a085de55 | 576 | dest = &(iphdr->dest); |
| pehrhovey | 0:a548a085de55 | 577 | } |
| pehrhovey | 0:a548a085de55 | 578 | |
| pehrhovey | 0:a548a085de55 | 579 | IP_STATS_INC(ip.xmit); |
| pehrhovey | 0:a548a085de55 | 580 | |
| pehrhovey | 0:a548a085de55 | 581 | LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num)); |
| pehrhovey | 0:a548a085de55 | 582 | ip_debug_print(p); |
| pehrhovey | 0:a548a085de55 | 583 | |
| pehrhovey | 0:a548a085de55 | 584 | #if ENABLE_LOOPBACK |
| pehrhovey | 0:a548a085de55 | 585 | if (ip_addr_cmp(dest, &netif->ip_addr)) { |
| pehrhovey | 0:a548a085de55 | 586 | /* Packet to self, enqueue it for loopback */ |
| pehrhovey | 0:a548a085de55 | 587 | LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()")); |
| pehrhovey | 0:a548a085de55 | 588 | return netif_loop_output(netif, p, dest); |
| pehrhovey | 0:a548a085de55 | 589 | } |
| pehrhovey | 0:a548a085de55 | 590 | #endif /* ENABLE_LOOPBACK */ |
| pehrhovey | 0:a548a085de55 | 591 | #if IP_FRAG |
| pehrhovey | 0:a548a085de55 | 592 | /* don't fragment if interface has mtu set to 0 [loopif] */ |
| pehrhovey | 0:a548a085de55 | 593 | if (netif->mtu && (p->tot_len > netif->mtu)) { |
| pehrhovey | 0:a548a085de55 | 594 | return ip_frag(p,netif,dest); |
| pehrhovey | 0:a548a085de55 | 595 | } |
| pehrhovey | 0:a548a085de55 | 596 | #endif |
| pehrhovey | 0:a548a085de55 | 597 | |
| pehrhovey | 0:a548a085de55 | 598 | LWIP_DEBUGF(IP_DEBUG, ("netif->output()")); |
| pehrhovey | 0:a548a085de55 | 599 | return netif->output(netif, p, dest); |
| pehrhovey | 0:a548a085de55 | 600 | } |
| pehrhovey | 0:a548a085de55 | 601 | |
| pehrhovey | 0:a548a085de55 | 602 | /** |
| pehrhovey | 0:a548a085de55 | 603 | * Simple interface to ip_output_if. It finds the outgoing network |
| pehrhovey | 0:a548a085de55 | 604 | * interface and calls upon ip_output_if to do the actual work. |
| pehrhovey | 0:a548a085de55 | 605 | * |
| pehrhovey | 0:a548a085de55 | 606 | * @param p the packet to send (p->payload points to the data, e.g. next |
| pehrhovey | 0:a548a085de55 | 607 | protocol header; if dest == IP_HDRINCL, p already includes an IP |
| pehrhovey | 0:a548a085de55 | 608 | header and p->payload points to that IP header) |
| pehrhovey | 0:a548a085de55 | 609 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the |
| pehrhovey | 0:a548a085de55 | 610 | * IP address of the netif used to send is used as source address) |
| pehrhovey | 0:a548a085de55 | 611 | * @param dest the destination IP address to send the packet to |
| pehrhovey | 0:a548a085de55 | 612 | * @param ttl the TTL value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 613 | * @param tos the TOS value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 614 | * @param proto the PROTOCOL to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 615 | * |
| pehrhovey | 0:a548a085de55 | 616 | * @return ERR_RTE if no route is found |
| pehrhovey | 0:a548a085de55 | 617 | * see ip_output_if() for more return values |
| pehrhovey | 0:a548a085de55 | 618 | */ |
| pehrhovey | 0:a548a085de55 | 619 | err_t |
| pehrhovey | 0:a548a085de55 | 620 | ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, |
| pehrhovey | 0:a548a085de55 | 621 | u8_t ttl, u8_t tos, u8_t proto) |
| pehrhovey | 0:a548a085de55 | 622 | { |
| pehrhovey | 0:a548a085de55 | 623 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 624 | |
| pehrhovey | 0:a548a085de55 | 625 | if ((netif = ip_route(dest)) == NULL) { |
| pehrhovey | 0:a548a085de55 | 626 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr)); |
| pehrhovey | 0:a548a085de55 | 627 | IP_STATS_INC(ip.rterr); |
| pehrhovey | 0:a548a085de55 | 628 | return ERR_RTE; |
| pehrhovey | 0:a548a085de55 | 629 | } |
| pehrhovey | 0:a548a085de55 | 630 | |
| pehrhovey | 0:a548a085de55 | 631 | return ip_output_if(p, src, dest, ttl, tos, proto, netif); |
| pehrhovey | 0:a548a085de55 | 632 | } |
| pehrhovey | 0:a548a085de55 | 633 | |
| pehrhovey | 0:a548a085de55 | 634 | #if LWIP_NETIF_HWADDRHINT |
| pehrhovey | 0:a548a085de55 | 635 | /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint |
| pehrhovey | 0:a548a085de55 | 636 | * before calling ip_output_if. |
| pehrhovey | 0:a548a085de55 | 637 | * |
| pehrhovey | 0:a548a085de55 | 638 | * @param p the packet to send (p->payload points to the data, e.g. next |
| pehrhovey | 0:a548a085de55 | 639 | protocol header; if dest == IP_HDRINCL, p already includes an IP |
| pehrhovey | 0:a548a085de55 | 640 | header and p->payload points to that IP header) |
| pehrhovey | 0:a548a085de55 | 641 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the |
| pehrhovey | 0:a548a085de55 | 642 | * IP address of the netif used to send is used as source address) |
| pehrhovey | 0:a548a085de55 | 643 | * @param dest the destination IP address to send the packet to |
| pehrhovey | 0:a548a085de55 | 644 | * @param ttl the TTL value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 645 | * @param tos the TOS value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 646 | * @param proto the PROTOCOL to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 647 | * @param addr_hint address hint pointer set to netif->addr_hint before |
| pehrhovey | 0:a548a085de55 | 648 | * calling ip_output_if() |
| pehrhovey | 0:a548a085de55 | 649 | * |
| pehrhovey | 0:a548a085de55 | 650 | * @return ERR_RTE if no route is found |
| pehrhovey | 0:a548a085de55 | 651 | * see ip_output_if() for more return values |
| pehrhovey | 0:a548a085de55 | 652 | */ |
| pehrhovey | 0:a548a085de55 | 653 | err_t |
| pehrhovey | 0:a548a085de55 | 654 | ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, |
| pehrhovey | 0:a548a085de55 | 655 | u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint) |
| pehrhovey | 0:a548a085de55 | 656 | { |
| pehrhovey | 0:a548a085de55 | 657 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 658 | err_t err; |
| pehrhovey | 0:a548a085de55 | 659 | |
| pehrhovey | 0:a548a085de55 | 660 | if ((netif = ip_route(dest)) == NULL) { |
| pehrhovey | 0:a548a085de55 | 661 | LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr)); |
| pehrhovey | 0:a548a085de55 | 662 | IP_STATS_INC(ip.rterr); |
| pehrhovey | 0:a548a085de55 | 663 | return ERR_RTE; |
| pehrhovey | 0:a548a085de55 | 664 | } |
| pehrhovey | 0:a548a085de55 | 665 | |
| pehrhovey | 0:a548a085de55 | 666 | netif->addr_hint = addr_hint; |
| pehrhovey | 0:a548a085de55 | 667 | err = ip_output_if(p, src, dest, ttl, tos, proto, netif); |
| pehrhovey | 0:a548a085de55 | 668 | netif->addr_hint = NULL; |
| pehrhovey | 0:a548a085de55 | 669 | |
| pehrhovey | 0:a548a085de55 | 670 | return err; |
| pehrhovey | 0:a548a085de55 | 671 | } |
| pehrhovey | 0:a548a085de55 | 672 | #endif /* LWIP_NETIF_HWADDRHINT*/ |
| pehrhovey | 0:a548a085de55 | 673 | |
| pehrhovey | 0:a548a085de55 | 674 | #if IP_DEBUG |
| pehrhovey | 0:a548a085de55 | 675 | /* Print an IP header by using LWIP_DEBUGF |
| pehrhovey | 0:a548a085de55 | 676 | * @param p an IP packet, p->payload pointing to the IP header |
| pehrhovey | 0:a548a085de55 | 677 | */ |
| pehrhovey | 0:a548a085de55 | 678 | void |
| pehrhovey | 0:a548a085de55 | 679 | ip_debug_print(struct pbuf *p) |
| pehrhovey | 0:a548a085de55 | 680 | { |
| pehrhovey | 0:a548a085de55 | 681 | struct ip_hdr *iphdr = p->payload; |
| pehrhovey | 0:a548a085de55 | 682 | u8_t *payload; |
| pehrhovey | 0:a548a085de55 | 683 | |
| pehrhovey | 0:a548a085de55 | 684 | payload = (u8_t *)iphdr + IP_HLEN; |
| pehrhovey | 0:a548a085de55 | 685 | |
| pehrhovey | 0:a548a085de55 | 686 | LWIP_DEBUGF(IP_DEBUG, ("IP header:\n")); |
| pehrhovey | 0:a548a085de55 | 687 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 688 | LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n", |
| pehrhovey | 0:a548a085de55 | 689 | IPH_V(iphdr), |
| pehrhovey | 0:a548a085de55 | 690 | IPH_HL(iphdr), |
| pehrhovey | 0:a548a085de55 | 691 | IPH_TOS(iphdr), |
| pehrhovey | 0:a548a085de55 | 692 | ntohs(IPH_LEN(iphdr)))); |
| pehrhovey | 0:a548a085de55 | 693 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 694 | LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n", |
| pehrhovey | 0:a548a085de55 | 695 | ntohs(IPH_ID(iphdr)), |
| pehrhovey | 0:a548a085de55 | 696 | ntohs(IPH_OFFSET(iphdr)) >> 15 & 1, |
| pehrhovey | 0:a548a085de55 | 697 | ntohs(IPH_OFFSET(iphdr)) >> 14 & 1, |
| pehrhovey | 0:a548a085de55 | 698 | ntohs(IPH_OFFSET(iphdr)) >> 13 & 1, |
| pehrhovey | 0:a548a085de55 | 699 | ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)); |
| pehrhovey | 0:a548a085de55 | 700 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 701 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n", |
| pehrhovey | 0:a548a085de55 | 702 | IPH_TTL(iphdr), |
| pehrhovey | 0:a548a085de55 | 703 | IPH_PROTO(iphdr), |
| pehrhovey | 0:a548a085de55 | 704 | ntohs(IPH_CHKSUM(iphdr)))); |
| pehrhovey | 0:a548a085de55 | 705 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 706 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n", |
| pehrhovey | 0:a548a085de55 | 707 | ip4_addr1(&iphdr->src), |
| pehrhovey | 0:a548a085de55 | 708 | ip4_addr2(&iphdr->src), |
| pehrhovey | 0:a548a085de55 | 709 | ip4_addr3(&iphdr->src), |
| pehrhovey | 0:a548a085de55 | 710 | ip4_addr4(&iphdr->src))); |
| pehrhovey | 0:a548a085de55 | 711 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 712 | LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n", |
| pehrhovey | 0:a548a085de55 | 713 | ip4_addr1(&iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 714 | ip4_addr2(&iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 715 | ip4_addr3(&iphdr->dest), |
| pehrhovey | 0:a548a085de55 | 716 | ip4_addr4(&iphdr->dest))); |
| pehrhovey | 0:a548a085de55 | 717 | LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| pehrhovey | 0:a548a085de55 | 718 | } |
| pehrhovey | 0:a548a085de55 | 719 | #endif /* IP_DEBUG */ |