| /** |
| * @file |
| * This is the IPv4 layer implementation for incoming and outgoing IP traffic. |
| * |
| * @see ip_frag.c |
| * |
| */ |
| |
| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| |
| #include "lwip/opt.h" |
| |
| #if LWIP_IPV4 |
| |
| #include "lwip/ip.h" |
| #include "lwip/def.h" |
| #include "lwip/mem.h" |
| #include "lwip/ip4_frag.h" |
| #include "lwip/inet_chksum.h" |
| #include "lwip/netif.h" |
| #include "lwip/icmp.h" |
| #include "lwip/igmp.h" |
| #include "lwip/priv/raw_priv.h" |
| #include "lwip/udp.h" |
| #include "lwip/priv/tcp_priv.h" |
| #include "lwip/autoip.h" |
| #include "lwip/stats.h" |
| #include "lwip/prot/iana.h" |
| |
| #include <string.h> |
| |
| #ifdef LWIP_HOOK_FILENAME |
| #include LWIP_HOOK_FILENAME |
| #endif |
| |
| /** Set this to 0 in the rare case of wanting to call an extra function to |
| * generate the IP checksum (in contrast to calculating it on-the-fly). */ |
| #ifndef LWIP_INLINE_IP_CHKSUM |
| #if LWIP_CHECKSUM_CTRL_PER_NETIF |
| #define LWIP_INLINE_IP_CHKSUM 0 |
| #else /* LWIP_CHECKSUM_CTRL_PER_NETIF */ |
| #define LWIP_INLINE_IP_CHKSUM 1 |
| #endif /* LWIP_CHECKSUM_CTRL_PER_NETIF */ |
| #endif |
| |
| #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP |
| #define CHECKSUM_GEN_IP_INLINE 1 |
| #else |
| #define CHECKSUM_GEN_IP_INLINE 0 |
| #endif |
| |
| #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT) |
| #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1 |
| |
| /** Some defines for DHCP to let link-layer-addressed packets through while the |
| * netif is down. |
| * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT(port) |
| * to return 1 if the port is accepted and 0 if the port is not accepted. |
| */ |
| #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) |
| /* accept DHCP client port and custom port */ |
| #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(LWIP_IANA_PORT_DHCP_CLIENT)) \ |
| || (LWIP_IP_ACCEPT_UDP_PORT(port))) |
| #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */ |
| /* accept custom port only */ |
| #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(port)) |
| #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */ |
| /* accept DHCP client port only */ |
| #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(LWIP_IANA_PORT_DHCP_CLIENT)) |
| #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */ |
| |
| #else /* LWIP_DHCP */ |
| #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0 |
| #endif /* LWIP_DHCP */ |
| |
| /** The IP header ID of the next outgoing IP packet */ |
| static u16_t ip_id; |
| |
| #if LWIP_MULTICAST_TX_OPTIONS |
| /** The default netif used for multicast */ |
| static struct netif *ip4_default_multicast_netif; |
| |
| /** |
| * @ingroup ip4 |
| * Set a default netif for IPv4 multicast. */ |
| void |
| ip4_set_default_multicast_netif(struct netif *default_multicast_netif) |
| { |
| ip4_default_multicast_netif = default_multicast_netif; |
| } |
| #endif /* LWIP_MULTICAST_TX_OPTIONS */ |
| |
| #ifdef LWIP_HOOK_IP4_ROUTE_SRC |
| /** |
| * Source based IPv4 routing must be fully implemented in |
| * LWIP_HOOK_IP4_ROUTE_SRC(). This function only provides the parameters. |
| */ |
| struct netif * |
| ip4_route_src(const ip4_addr_t *src, const ip4_addr_t *dest) |
| { |
| if (src != NULL) { |
| /* when src==NULL, the hook is called from ip4_route(dest) */ |
| struct netif *netif = LWIP_HOOK_IP4_ROUTE_SRC(src, dest); |
| if (netif != NULL) { |
| return netif; |
| } |
| } |
| return ip4_route(dest); |
| } |
| #endif /* LWIP_HOOK_IP4_ROUTE_SRC */ |
| |
| /** |
| * Finds the appropriate network interface for a given IP address. It |
| * searches the list of network interfaces linearly. A match is found |
| * if the masked IP address of the network interface equals the masked |
| * IP address given to the function. |
| * |
| * @param dest the destination IP address for which to find the route |
| * @return the netif on which to send to reach dest |
| */ |
| struct netif * |
| ip4_route(const ip4_addr_t *dest) |
| { |
| #if !LWIP_SINGLE_NETIF |
| struct netif *netif; |
| |
| LWIP_ASSERT_CORE_LOCKED(); |
| |
| #if LWIP_MULTICAST_TX_OPTIONS |
| /* Use administratively selected interface for multicast by default */ |
| if (ip4_addr_ismulticast(dest) && ip4_default_multicast_netif) { |
| return ip4_default_multicast_netif; |
| } |
| #endif /* LWIP_MULTICAST_TX_OPTIONS */ |
| |
| /* bug #54569: in case LWIP_SINGLE_NETIF=1 and LWIP_DEBUGF() disabled, the following loop is optimized away */ |
| LWIP_UNUSED_ARG(dest); |
| |
| /* iterate through netifs */ |
| NETIF_FOREACH(netif) { |
| /* is the netif up, does it have a link and a valid address? */ |
| if (netif_is_up(netif) && netif_is_link_up(netif) && !ip4_addr_isany_val(*netif_ip4_addr(netif))) { |
| /* network mask matches? */ |
| if (ip4_addr_netcmp(dest, netif_ip4_addr(netif), netif_ip4_netmask(netif))) { |
| /* return netif on which to forward IP packet */ |
| return netif; |
| } |
| /* gateway matches on a non broadcast interface? (i.e. peer in a point to point interface) */ |
| if (((netif->flags & NETIF_FLAG_BROADCAST) == 0) && ip4_addr_cmp(dest, netif_ip4_gw(netif))) { |
| /* return netif on which to forward IP packet */ |
| return netif; |
| } |
| } |
| } |
| |
| #if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF |
| /* loopif is disabled, looopback traffic is passed through any netif */ |
| if (ip4_addr_isloopback(dest)) { |
| /* don't check for link on loopback traffic */ |
| if (netif_default != NULL && netif_is_up(netif_default)) { |
| return netif_default; |
| } |
| /* default netif is not up, just use any netif for loopback traffic */ |
| NETIF_FOREACH(netif) { |
| if (netif_is_up(netif)) { |
| return netif; |
| } |
| } |
| return NULL; |
| } |
| #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */ |
| |
| #ifdef LWIP_HOOK_IP4_ROUTE_SRC |
| netif = LWIP_HOOK_IP4_ROUTE_SRC(NULL, dest); |
| if (netif != NULL) { |
| return netif; |
| } |
| #elif defined(LWIP_HOOK_IP4_ROUTE) |
| netif = LWIP_HOOK_IP4_ROUTE(dest); |
| if (netif != NULL) { |
| return netif; |
| } |
| #endif |
| #endif /* !LWIP_SINGLE_NETIF */ |
| |
| if ((netif_default == NULL) || !netif_is_up(netif_default) || !netif_is_link_up(netif_default) || |
| ip4_addr_isany_val(*netif_ip4_addr(netif_default)) || ip4_addr_isloopback(dest)) { |
| /* No matching netif found and default netif is not usable. |
| If this is not good enough for you, use LWIP_HOOK_IP4_ROUTE() */ |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest))); |
| IP_STATS_INC(ip.rterr); |
| MIB2_STATS_INC(mib2.ipoutnoroutes); |
| return NULL; |
| } |
| |
| return netif_default; |
| } |
| |
| #if IP_FORWARD |
| /** |
| * Determine whether an IP address is in a reserved set of addresses |
| * that may not be forwarded, or whether datagrams to that destination |
| * may be forwarded. |
| * @param p the packet to forward |
| * @return 1: can forward 0: discard |
| */ |
| static int |
| ip4_canforward(struct pbuf *p) |
| { |
| u32_t addr = lwip_htonl(ip4_addr_get_u32(ip4_current_dest_addr())); |
| |
| #ifdef LWIP_HOOK_IP4_CANFORWARD |
| int ret = LWIP_HOOK_IP4_CANFORWARD(p, addr); |
| if (ret >= 0) { |
| return ret; |
| } |
| #endif /* LWIP_HOOK_IP4_CANFORWARD */ |
| |
| if (p->flags & PBUF_FLAG_LLBCAST) { |
| /* don't route link-layer broadcasts */ |
| return 0; |
| } |
| if ((p->flags & PBUF_FLAG_LLMCAST) || IP_MULTICAST(addr)) { |
| /* don't route link-layer multicasts (use LWIP_HOOK_IP4_CANFORWARD instead) */ |
| return 0; |
| } |
| if (IP_EXPERIMENTAL(addr)) { |
| return 0; |
| } |
| if (IP_CLASSA(addr)) { |
| u32_t net = addr & IP_CLASSA_NET; |
| if ((net == 0) || (net == ((u32_t)IP_LOOPBACKNET << IP_CLASSA_NSHIFT))) { |
| /* don't route loopback packets */ |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /** |
| * Forwards an IP packet. It finds an appropriate route for the |
| * packet, decrements the TTL value of the packet, adjusts the |
| * checksum and outputs the packet on the appropriate interface. |
| * |
| * @param p the packet to forward (p->payload points to IP header) |
| * @param iphdr the IP header of the input packet |
| * @param inp the netif on which this packet was received |
| */ |
| static void |
| ip4_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp) |
| { |
| struct netif *netif; |
| |
| PERF_START; |
| LWIP_UNUSED_ARG(inp); |
| |
| if (!ip4_canforward(p)) { |
| goto return_noroute; |
| } |
| |
| /* RFC3927 2.7: do not forward link-local addresses */ |
| if (ip4_addr_islinklocal(ip4_current_dest_addr())) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()), |
| ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr()))); |
| goto return_noroute; |
| } |
| |
| /* Find network interface where to forward this IP packet to. */ |
| netif = ip4_route_src(ip4_current_src_addr(), ip4_current_dest_addr()); |
| if (netif == NULL) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n", |
| ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()), |
| ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr()))); |
| /* @todo: send ICMP_DUR_NET? */ |
| goto return_noroute; |
| } |
| #if !IP_FORWARD_ALLOW_TX_ON_RX_NETIF |
| /* Do not forward packets onto the same network interface on which |
| * they arrived. */ |
| if (netif == inp) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: not bouncing packets back on incoming interface.\n")); |
| goto return_noroute; |
| } |
| #endif /* IP_FORWARD_ALLOW_TX_ON_RX_NETIF */ |
| |
| /* decrement TTL */ |
| IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1); |
| /* send ICMP if TTL == 0 */ |
| if (IPH_TTL(iphdr) == 0) { |
| MIB2_STATS_INC(mib2.ipinhdrerrors); |
| #if LWIP_ICMP |
| /* Don't send ICMP messages in response to ICMP messages */ |
| if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) { |
| icmp_time_exceeded(p, ICMP_TE_TTL); |
| } |
| #endif /* LWIP_ICMP */ |
| return; |
| } |
| |
| /* Incrementally update the IP checksum. */ |
| if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) { |
| IPH_CHKSUM_SET(iphdr, (u16_t)(IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1)); |
| } else { |
| IPH_CHKSUM_SET(iphdr, (u16_t)(IPH_CHKSUM(iphdr) + PP_HTONS(0x100))); |
| } |
| |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()), |
| ip4_addr3_16(ip4_current_dest_addr()), ip4_addr4_16(ip4_current_dest_addr()))); |
| |
| IP_STATS_INC(ip.fw); |
| MIB2_STATS_INC(mib2.ipforwdatagrams); |
| IP_STATS_INC(ip.xmit); |
| |
| PERF_STOP("ip4_forward"); |
| /* don't fragment if interface has mtu set to 0 [loopif] */ |
| if (netif->mtu && (p->tot_len > netif->mtu)) { |
| if ((IPH_OFFSET(iphdr) & PP_NTOHS(IP_DF)) == 0) { |
| #if IP_FRAG |
| ip4_frag(p, netif, ip4_current_dest_addr()); |
| #else /* IP_FRAG */ |
| /* @todo: send ICMP Destination Unreachable code 13 "Communication administratively prohibited"? */ |
| #endif /* IP_FRAG */ |
| } else { |
| #if LWIP_ICMP |
| /* send ICMP Destination Unreachable code 4: "Fragmentation Needed and DF Set" */ |
| icmp_dest_unreach(p, ICMP_DUR_FRAG); |
| #endif /* LWIP_ICMP */ |
| } |
| return; |
| } |
| /* transmit pbuf on chosen interface */ |
| netif->output(netif, p, ip4_current_dest_addr()); |
| return; |
| return_noroute: |
| MIB2_STATS_INC(mib2.ipoutnoroutes); |
| } |
| #endif /* IP_FORWARD */ |
| |
| /** Return true if the current input packet should be accepted on this netif */ |
| static int |
| ip4_input_accept(struct netif *netif) |
| { |
| 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", |
| ip4_addr_get_u32(ip4_current_dest_addr()), ip4_addr_get_u32(netif_ip4_addr(netif)), |
| ip4_addr_get_u32(ip4_current_dest_addr()) & ip4_addr_get_u32(netif_ip4_netmask(netif)), |
| ip4_addr_get_u32(netif_ip4_addr(netif)) & ip4_addr_get_u32(netif_ip4_netmask(netif)), |
| ip4_addr_get_u32(ip4_current_dest_addr()) & ~ip4_addr_get_u32(netif_ip4_netmask(netif)))); |
| |
| /* interface is up and configured? */ |
| if ((netif_is_up(netif)) && (!ip4_addr_isany_val(*netif_ip4_addr(netif)))) { |
| /* unicast to this interface address? */ |
| if (ip4_addr_cmp(ip4_current_dest_addr(), netif_ip4_addr(netif)) || |
| /* or broadcast on this interface network address? */ |
| ip4_addr_isbroadcast(ip4_current_dest_addr(), netif) |
| #if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF |
| || (ip4_addr_get_u32(ip4_current_dest_addr()) == PP_HTONL(IPADDR_LOOPBACK)) |
| #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */ |
| ) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_input: packet accepted on interface %c%c\n", |
| netif->name[0], netif->name[1])); |
| /* accept on this netif */ |
| return 1; |
| } |
| #if LWIP_AUTOIP |
| /* connections to link-local addresses must persist after changing |
| the netif's address (RFC3927 ch. 1.9) */ |
| if (autoip_accept_packet(netif, ip4_current_dest_addr())) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_input: LLA packet accepted on interface %c%c\n", |
| netif->name[0], netif->name[1])); |
| /* accept on this netif */ |
| return 1; |
| } |
| #endif /* LWIP_AUTOIP */ |
| } |
| return 0; |
| } |
| |
| /** |
| * This function is called by the network interface device driver when |
| * an IP packet is received. The function does the basic checks of the |
| * IP header such as packet size being at least larger than the header |
| * size etc. If the packet was not destined for us, the packet is |
| * forwarded (using ip_forward). The IP checksum is always checked. |
| * |
| * Finally, the packet is sent to the upper layer protocol input function. |
| * |
| * @param p the received IP packet (p->payload points to IP header) |
| * @param inp the netif on which this packet was received |
| * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't |
| * processed, but currently always returns ERR_OK) |
| */ |
| err_t |
| ip4_input(struct pbuf *p, struct netif *inp) |
| { |
| const struct ip_hdr *iphdr; |
| struct netif *netif; |
| u16_t iphdr_hlen; |
| u16_t iphdr_len; |
| #if IP_ACCEPT_LINK_LAYER_ADDRESSING || LWIP_IGMP |
| int check_ip_src = 1; |
| #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING || LWIP_IGMP */ |
| #if LWIP_RAW |
| raw_input_state_t raw_status; |
| #endif /* LWIP_RAW */ |
| |
| LWIP_ASSERT_CORE_LOCKED(); |
| |
| IP_STATS_INC(ip.recv); |
| MIB2_STATS_INC(mib2.ipinreceives); |
| |
| /* identify the IP header */ |
| iphdr = (struct ip_hdr *)p->payload; |
| if (IPH_V(iphdr) != 4) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", (u16_t)IPH_V(iphdr))); |
| ip4_debug_print(p); |
| pbuf_free(p); |
| IP_STATS_INC(ip.err); |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipinhdrerrors); |
| return ERR_OK; |
| } |
| |
| #ifdef LWIP_HOOK_IP4_INPUT |
| if (LWIP_HOOK_IP4_INPUT(p, inp)) { |
| /* the packet has been eaten */ |
| return ERR_OK; |
| } |
| #endif |
| |
| /* obtain IP header length in bytes */ |
| iphdr_hlen = IPH_HL_BYTES(iphdr); |
| /* obtain ip length in bytes */ |
| iphdr_len = lwip_ntohs(IPH_LEN(iphdr)); |
| |
| /* Trim pbuf. This is especially required for packets < 60 bytes. */ |
| if (iphdr_len < p->tot_len) { |
| pbuf_realloc(p, iphdr_len); |
| } |
| |
| /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */ |
| if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len) || (iphdr_hlen < IP_HLEN)) { |
| if (iphdr_hlen < IP_HLEN) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| ("ip4_input: short IP header (%"U16_F" bytes) received, IP packet dropped\n", iphdr_hlen)); |
| } |
| if (iphdr_hlen > p->len) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n", |
| iphdr_hlen, p->len)); |
| } |
| if (iphdr_len > p->tot_len) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n", |
| iphdr_len, p->tot_len)); |
| } |
| /* free (drop) packet pbufs */ |
| pbuf_free(p); |
| IP_STATS_INC(ip.lenerr); |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipindiscards); |
| return ERR_OK; |
| } |
| |
| /* verify checksum */ |
| #if CHECKSUM_CHECK_IP |
| IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_CHECK_IP) { |
| if (inet_chksum(iphdr, iphdr_hlen) != 0) { |
| |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, |
| ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen))); |
| ip4_debug_print(p); |
| pbuf_free(p); |
| IP_STATS_INC(ip.chkerr); |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipinhdrerrors); |
| return ERR_OK; |
| } |
| } |
| #endif |
| |
| /* copy IP addresses to aligned ip_addr_t */ |
| ip_addr_copy_from_ip4(ip_data.current_iphdr_dest, iphdr->dest); |
| ip_addr_copy_from_ip4(ip_data.current_iphdr_src, iphdr->src); |
| |
| /* match packet against an interface, i.e. is this packet for us? */ |
| if (ip4_addr_ismulticast(ip4_current_dest_addr())) { |
| #if LWIP_IGMP |
| if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, ip4_current_dest_addr()))) { |
| /* IGMP snooping switches need 0.0.0.0 to be allowed as source address (RFC 4541) */ |
| ip4_addr_t allsystems; |
| IP4_ADDR(&allsystems, 224, 0, 0, 1); |
| if (ip4_addr_cmp(ip4_current_dest_addr(), &allsystems) && |
| ip4_addr_isany(ip4_current_src_addr())) { |
| check_ip_src = 0; |
| } |
| netif = inp; |
| } else { |
| netif = NULL; |
| } |
| #else /* LWIP_IGMP */ |
| if ((netif_is_up(inp)) && (!ip4_addr_isany_val(*netif_ip4_addr(inp)))) { |
| netif = inp; |
| } else { |
| netif = NULL; |
| } |
| #endif /* LWIP_IGMP */ |
| } else { |
| /* start trying with inp. if that's not acceptable, start walking the |
| list of configured netifs. */ |
| if (ip4_input_accept(inp)) { |
| netif = inp; |
| } else { |
| netif = NULL; |
| #if !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF |
| /* Packets sent to the loopback address must not be accepted on an |
| * interface that does not have the loopback address assigned to it, |
| * unless a non-loopback interface is used for loopback traffic. */ |
| if (!ip4_addr_isloopback(ip4_current_dest_addr())) |
| #endif /* !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF */ |
| { |
| #if !LWIP_SINGLE_NETIF |
| NETIF_FOREACH(netif) { |
| if (netif == inp) { |
| /* we checked that before already */ |
| continue; |
| } |
| if (ip4_input_accept(netif)) { |
| break; |
| } |
| } |
| #endif /* !LWIP_SINGLE_NETIF */ |
| } |
| } |
| } |
| |
| #if IP_ACCEPT_LINK_LAYER_ADDRESSING |
| /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed |
| * using link layer addressing (such as Ethernet MAC) so we must not filter on IP. |
| * According to RFC 1542 section 3.1.1, referred by RFC 2131). |
| * |
| * If you want to accept private broadcast communication while a netif is down, |
| * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.: |
| * |
| * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345)) |
| */ |
| if (netif == NULL) { |
| /* remote port is DHCP server? */ |
| if (IPH_PROTO(iphdr) == IP_PROTO_UDP) { |
| const struct udp_hdr *udphdr = (const struct udp_hdr *)((const u8_t *)iphdr + iphdr_hlen); |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: UDP packet to DHCP client port %"U16_F"\n", |
| lwip_ntohs(udphdr->dest))); |
| if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: DHCP packet accepted.\n")); |
| netif = inp; |
| check_ip_src = 0; |
| } |
| } |
| } |
| #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */ |
| |
| /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */ |
| #if LWIP_IGMP || IP_ACCEPT_LINK_LAYER_ADDRESSING |
| if (check_ip_src |
| #if IP_ACCEPT_LINK_LAYER_ADDRESSING |
| /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */ |
| && !ip4_addr_isany_val(*ip4_current_src_addr()) |
| #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */ |
| ) |
| #endif /* LWIP_IGMP || IP_ACCEPT_LINK_LAYER_ADDRESSING */ |
| { |
| if ((ip4_addr_isbroadcast(ip4_current_src_addr(), inp)) || |
| (ip4_addr_ismulticast(ip4_current_src_addr()))) { |
| /* packet source is not valid */ |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip4_input: packet source is not valid.\n")); |
| /* free (drop) packet pbufs */ |
| pbuf_free(p); |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipinaddrerrors); |
| MIB2_STATS_INC(mib2.ipindiscards); |
| return ERR_OK; |
| } |
| } |
| |
| /* packet not for us? */ |
| if (netif == NULL) { |
| /* packet not for us, route or discard */ |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip4_input: packet not for us.\n")); |
| #if IP_FORWARD |
| /* non-broadcast packet? */ |
| if (!ip4_addr_isbroadcast(ip4_current_dest_addr(), inp)) { |
| /* try to forward IP packet on (other) interfaces */ |
| ip4_forward(p, (struct ip_hdr *)p->payload, inp); |
| } else |
| #endif /* IP_FORWARD */ |
| { |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipinaddrerrors); |
| MIB2_STATS_INC(mib2.ipindiscards); |
| } |
| pbuf_free(p); |
| return ERR_OK; |
| } |
| /* packet consists of multiple fragments? */ |
| if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) { |
| #if IP_REASSEMBLY /* packet fragment reassembly code present? */ |
| 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 ip4_reass()\n", |
| lwip_ntohs(IPH_ID(iphdr)), p->tot_len, lwip_ntohs(IPH_LEN(iphdr)), (u16_t)!!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (u16_t)((lwip_ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK) * 8))); |
| /* reassemble the packet*/ |
| p = ip4_reass(p); |
| /* packet not fully reassembled yet? */ |
| if (p == NULL) { |
| return ERR_OK; |
| } |
| iphdr = (const struct ip_hdr *)p->payload; |
| #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */ |
| pbuf_free(p); |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n", |
| lwip_ntohs(IPH_OFFSET(iphdr)))); |
| IP_STATS_INC(ip.opterr); |
| IP_STATS_INC(ip.drop); |
| /* unsupported protocol feature */ |
| MIB2_STATS_INC(mib2.ipinunknownprotos); |
| return ERR_OK; |
| #endif /* IP_REASSEMBLY */ |
| } |
| |
| #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */ |
| |
| #if LWIP_IGMP |
| /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */ |
| if ((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) { |
| #else |
| if (iphdr_hlen > IP_HLEN) { |
| #endif /* LWIP_IGMP */ |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n")); |
| pbuf_free(p); |
| IP_STATS_INC(ip.opterr); |
| IP_STATS_INC(ip.drop); |
| /* unsupported protocol feature */ |
| MIB2_STATS_INC(mib2.ipinunknownprotos); |
| return ERR_OK; |
| } |
| #endif /* IP_OPTIONS_ALLOWED == 0 */ |
| |
| /* send to upper layers */ |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_input: \n")); |
| ip4_debug_print(p); |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len)); |
| |
| ip_data.current_netif = netif; |
| ip_data.current_input_netif = inp; |
| ip_data.current_ip4_header = iphdr; |
| ip_data.current_ip_header_tot_len = IPH_HL_BYTES(iphdr); |
| |
| #if LWIP_RAW |
| /* raw input did not eat the packet? */ |
| raw_status = raw_input(p, inp); |
| if (raw_status != RAW_INPUT_EATEN) |
| #endif /* LWIP_RAW */ |
| { |
| pbuf_remove_header(p, iphdr_hlen); /* Move to payload, no check necessary. */ |
| |
| switch (IPH_PROTO(iphdr)) { |
| #if LWIP_UDP |
| case IP_PROTO_UDP: |
| #if LWIP_UDPLITE |
| case IP_PROTO_UDPLITE: |
| #endif /* LWIP_UDPLITE */ |
| MIB2_STATS_INC(mib2.ipindelivers); |
| udp_input(p, inp); |
| break; |
| #endif /* LWIP_UDP */ |
| #if LWIP_TCP |
| case IP_PROTO_TCP: |
| MIB2_STATS_INC(mib2.ipindelivers); |
| tcp_input(p, inp); |
| break; |
| #endif /* LWIP_TCP */ |
| #if LWIP_ICMP |
| case IP_PROTO_ICMP: |
| MIB2_STATS_INC(mib2.ipindelivers); |
| icmp_input(p, inp); |
| break; |
| #endif /* LWIP_ICMP */ |
| #if LWIP_IGMP |
| case IP_PROTO_IGMP: |
| igmp_input(p, inp, ip4_current_dest_addr()); |
| break; |
| #endif /* LWIP_IGMP */ |
| default: |
| #if LWIP_RAW |
| if (raw_status == RAW_INPUT_DELIVERED) { |
| MIB2_STATS_INC(mib2.ipindelivers); |
| } else |
| #endif /* LWIP_RAW */ |
| { |
| #if LWIP_ICMP |
| /* send ICMP destination protocol unreachable unless is was a broadcast */ |
| if (!ip4_addr_isbroadcast(ip4_current_dest_addr(), netif) && |
| !ip4_addr_ismulticast(ip4_current_dest_addr())) { |
| pbuf_header_force(p, (s16_t)iphdr_hlen); /* Move to ip header, no check necessary. */ |
| icmp_dest_unreach(p, ICMP_DUR_PROTO); |
| } |
| #endif /* LWIP_ICMP */ |
| |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", (u16_t)IPH_PROTO(iphdr))); |
| |
| IP_STATS_INC(ip.proterr); |
| IP_STATS_INC(ip.drop); |
| MIB2_STATS_INC(mib2.ipinunknownprotos); |
| } |
| pbuf_free(p); |
| break; |
| } |
| } |
| |
| /* @todo: this is not really necessary... */ |
| ip_data.current_netif = NULL; |
| ip_data.current_input_netif = NULL; |
| ip_data.current_ip4_header = NULL; |
| ip_data.current_ip_header_tot_len = 0; |
| ip4_addr_set_any(ip4_current_src_addr()); |
| ip4_addr_set_any(ip4_current_dest_addr()); |
| |
| return ERR_OK; |
| } |
| |
| /** |
| * Sends an IP packet on a network interface. This function constructs |
| * the IP header and calculates the IP header checksum. If the source |
| * IP address is NULL, the IP address of the outgoing network |
| * interface is filled in as source address. |
| * If the destination IP address is LWIP_IP_HDRINCL, p is assumed to already |
| * include an IP header and p->payload points to it instead of the data. |
| * |
| * @param p the packet to send (p->payload points to the data, e.g. next |
| protocol header; if dest == LWIP_IP_HDRINCL, p already includes an |
| IP header and p->payload points to that IP header) |
| * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the |
| * IP address of the netif used to send is used as source address) |
| * @param dest the destination IP address to send the packet to |
| * @param ttl the TTL value to be set in the IP header |
| * @param tos the TOS value to be set in the IP header |
| * @param proto the PROTOCOL to be set in the IP header |
| * @param netif the netif on which to send this packet |
| * @return ERR_OK if the packet was sent OK |
| * ERR_BUF if p doesn't have enough space for IP/LINK headers |
| * returns errors returned by netif->output |
| * |
| * @note ip_id: RFC791 "some host may be able to simply use |
| * unique identifiers independent of destination" |
| */ |
| err_t |
| ip4_output_if(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, |
| u8_t proto, struct netif *netif) |
| { |
| #if IP_OPTIONS_SEND |
| return ip4_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0); |
| } |
| |
| /** |
| * Same as ip_output_if() but with the possibility to include IP options: |
| * |
| * @ param ip_options pointer to the IP options, copied into the IP header |
| * @ param optlen length of ip_options |
| */ |
| err_t |
| ip4_output_if_opt(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options, |
| u16_t optlen) |
| { |
| #endif /* IP_OPTIONS_SEND */ |
| const ip4_addr_t *src_used = src; |
| if (dest != LWIP_IP_HDRINCL) { |
| if (ip4_addr_isany(src)) { |
| src_used = netif_ip4_addr(netif); |
| } |
| } |
| |
| #if IP_OPTIONS_SEND |
| return ip4_output_if_opt_src(p, src_used, dest, ttl, tos, proto, netif, |
| ip_options, optlen); |
| #else /* IP_OPTIONS_SEND */ |
| return ip4_output_if_src(p, src_used, dest, ttl, tos, proto, netif); |
| #endif /* IP_OPTIONS_SEND */ |
| } |
| |
| /** |
| * Same as ip_output_if() but 'src' address is not replaced by netif address |
| * when it is 'any'. |
| */ |
| err_t |
| ip4_output_if_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, |
| u8_t proto, struct netif *netif) |
| { |
| #if IP_OPTIONS_SEND |
| return ip4_output_if_opt_src(p, src, dest, ttl, tos, proto, netif, NULL, 0); |
| } |
| |
| /** |
| * Same as ip_output_if_opt() but 'src' address is not replaced by netif address |
| * when it is 'any'. |
| */ |
| err_t |
| ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options, |
| u16_t optlen) |
| { |
| #endif /* IP_OPTIONS_SEND */ |
| struct ip_hdr *iphdr; |
| ip4_addr_t dest_addr; |
| #if CHECKSUM_GEN_IP_INLINE |
| u32_t chk_sum = 0; |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| |
| LWIP_ASSERT_CORE_LOCKED(); |
| LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); |
| |
| MIB2_STATS_INC(mib2.ipoutrequests); |
| |
| /* Should the IP header be generated or is it already included in p? */ |
| if (dest != LWIP_IP_HDRINCL) { |
| u16_t ip_hlen = IP_HLEN; |
| #if IP_OPTIONS_SEND |
| u16_t optlen_aligned = 0; |
| if (optlen != 0) { |
| #if CHECKSUM_GEN_IP_INLINE |
| int i; |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| if (optlen > (IP_HLEN_MAX - IP_HLEN)) { |
| /* optlen too long */ |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output_if_opt: optlen too long\n")); |
| IP_STATS_INC(ip.err); |
| MIB2_STATS_INC(mib2.ipoutdiscards); |
| return ERR_VAL; |
| } |
| /* round up to a multiple of 4 */ |
| optlen_aligned = (u16_t)((optlen + 3) & ~3); |
| ip_hlen = (u16_t)(ip_hlen + optlen_aligned); |
| /* First write in the IP options */ |
| if (pbuf_add_header(p, optlen_aligned)) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output_if_opt: not enough room for IP options in pbuf\n")); |
| IP_STATS_INC(ip.err); |
| MIB2_STATS_INC(mib2.ipoutdiscards); |
| return ERR_BUF; |
| } |
| MEMCPY(p->payload, ip_options, optlen); |
| if (optlen < optlen_aligned) { |
| /* zero the remaining bytes */ |
| memset(((char *)p->payload) + optlen, 0, (size_t)(optlen_aligned - optlen)); |
| } |
| #if CHECKSUM_GEN_IP_INLINE |
| for (i = 0; i < optlen_aligned / 2; i++) { |
| chk_sum += ((u16_t *)p->payload)[i]; |
| } |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| } |
| #endif /* IP_OPTIONS_SEND */ |
| /* generate IP header */ |
| if (pbuf_add_header(p, IP_HLEN)) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output: not enough room for IP header in pbuf\n")); |
| |
| IP_STATS_INC(ip.err); |
| MIB2_STATS_INC(mib2.ipoutdiscards); |
| return ERR_BUF; |
| } |
| |
| iphdr = (struct ip_hdr *)p->payload; |
| LWIP_ASSERT("check that first pbuf can hold struct ip_hdr", |
| (p->len >= sizeof(struct ip_hdr))); |
| |
| IPH_TTL_SET(iphdr, ttl); |
| IPH_PROTO_SET(iphdr, proto); |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += PP_NTOHS(proto | (ttl << 8)); |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| |
| /* dest cannot be NULL here */ |
| ip4_addr_copy(iphdr->dest, *dest); |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF; |
| chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16; |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| |
| IPH_VHL_SET(iphdr, 4, ip_hlen / 4); |
| IPH_TOS_SET(iphdr, tos); |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += PP_NTOHS(tos | (iphdr->_v_hl << 8)); |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| IPH_LEN_SET(iphdr, lwip_htons(p->tot_len)); |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += iphdr->_len; |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| IPH_OFFSET_SET(iphdr, 0); |
| IPH_ID_SET(iphdr, lwip_htons(ip_id)); |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += iphdr->_id; |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| ++ip_id; |
| |
| if (src == NULL) { |
| ip4_addr_copy(iphdr->src, *IP4_ADDR_ANY4); |
| } else { |
| /* src cannot be NULL here */ |
| ip4_addr_copy(iphdr->src, *src); |
| } |
| |
| #if CHECKSUM_GEN_IP_INLINE |
| chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF; |
| chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16; |
| chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF); |
| chk_sum = (chk_sum >> 16) + chk_sum; |
| chk_sum = ~chk_sum; |
| IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_IP) { |
| iphdr->_chksum = (u16_t)chk_sum; /* network order */ |
| } |
| #if LWIP_CHECKSUM_CTRL_PER_NETIF |
| else { |
| IPH_CHKSUM_SET(iphdr, 0); |
| } |
| #endif /* LWIP_CHECKSUM_CTRL_PER_NETIF*/ |
| #else /* CHECKSUM_GEN_IP_INLINE */ |
| IPH_CHKSUM_SET(iphdr, 0); |
| #if CHECKSUM_GEN_IP |
| IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_IP) { |
| IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen)); |
| } |
| #endif /* CHECKSUM_GEN_IP */ |
| #endif /* CHECKSUM_GEN_IP_INLINE */ |
| } else { |
| /* IP header already included in p */ |
| if (p->len < IP_HLEN) { |
| LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip4_output: LWIP_IP_HDRINCL but pbuf is too short\n")); |
| IP_STATS_INC(ip.err); |
| MIB2_STATS_INC(mib2.ipoutdiscards); |
| return ERR_BUF; |
| } |
| iphdr = (struct ip_hdr *)p->payload; |
| ip4_addr_copy(dest_addr, iphdr->dest); |
| dest = &dest_addr; |
| } |
| |
| IP_STATS_INC(ip.xmit); |
| |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num)); |
| ip4_debug_print(p); |
| |
| #if ENABLE_LOOPBACK |
| if (ip4_addr_cmp(dest, netif_ip4_addr(netif)) |
| #if !LWIP_HAVE_LOOPIF |
| || ip4_addr_isloopback(dest) |
| #endif /* !LWIP_HAVE_LOOPIF */ |
| ) { |
| /* Packet to self, enqueue it for loopback */ |
| LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()")); |
| return netif_loop_output(netif, p); |
| } |
| #if LWIP_MULTICAST_TX_OPTIONS |
| if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) { |
| netif_loop_output(netif, p); |
| } |
| #endif /* LWIP_MULTICAST_TX_OPTIONS */ |
| #endif /* ENABLE_LOOPBACK */ |
| #if IP_FRAG |
| /* don't fragment if interface has mtu set to 0 [loopif] */ |
| if (netif->mtu && (p->tot_len > netif->mtu)) { |
| return ip4_frag(p, netif, dest); |
| } |
| #endif /* IP_FRAG */ |
| |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: call netif->output()\n")); |
| return netif->output(netif, p, dest); |
| } |
| |
| /** |
| * Simple interface to ip_output_if. It finds the outgoing network |
| * interface and calls upon ip_output_if to do the actual work. |
| * |
| * @param p the packet to send (p->payload points to the data, e.g. next |
| protocol header; if dest == LWIP_IP_HDRINCL, p already includes an |
| IP header and p->payload points to that IP header) |
| * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the |
| * IP address of the netif used to send is used as source address) |
| * @param dest the destination IP address to send the packet to |
| * @param ttl the TTL value to be set in the IP header |
| * @param tos the TOS value to be set in the IP header |
| * @param proto the PROTOCOL to be set in the IP header |
| * |
| * @return ERR_RTE if no route is found |
| * see ip_output_if() for more return values |
| */ |
| err_t |
| ip4_output(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, u8_t proto) |
| { |
| struct netif *netif; |
| |
| LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); |
| |
| if ((netif = ip4_route_src(src, dest)) == NULL) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest))); |
| IP_STATS_INC(ip.rterr); |
| return ERR_RTE; |
| } |
| |
| return ip4_output_if(p, src, dest, ttl, tos, proto, netif); |
| } |
| |
| #if LWIP_NETIF_USE_HINTS |
| /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint |
| * before calling ip_output_if. |
| * |
| * @param p the packet to send (p->payload points to the data, e.g. next |
| protocol header; if dest == LWIP_IP_HDRINCL, p already includes an |
| IP header and p->payload points to that IP header) |
| * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the |
| * IP address of the netif used to send is used as source address) |
| * @param dest the destination IP address to send the packet to |
| * @param ttl the TTL value to be set in the IP header |
| * @param tos the TOS value to be set in the IP header |
| * @param proto the PROTOCOL to be set in the IP header |
| * @param netif_hint netif output hint pointer set to netif->hint before |
| * calling ip_output_if() |
| * |
| * @return ERR_RTE if no route is found |
| * see ip_output_if() for more return values |
| */ |
| err_t |
| ip4_output_hinted(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, |
| u8_t ttl, u8_t tos, u8_t proto, struct netif_hint *netif_hint) |
| { |
| struct netif *netif; |
| err_t err; |
| |
| LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); |
| |
| if ((netif = ip4_route_src(src, dest)) == NULL) { |
| LWIP_DEBUGF(IP_DEBUG, ("ip4_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest))); |
| IP_STATS_INC(ip.rterr); |
| return ERR_RTE; |
| } |
| |
| NETIF_SET_HINTS(netif, netif_hint); |
| err = ip4_output_if(p, src, dest, ttl, tos, proto, netif); |
| NETIF_RESET_HINTS(netif); |
| |
| return err; |
| } |
| #endif /* LWIP_NETIF_USE_HINTS*/ |
| |
| #if IP_DEBUG |
| /* Print an IP header by using LWIP_DEBUGF |
| * @param p an IP packet, p->payload pointing to the IP header |
| */ |
| void |
| ip4_debug_print(struct pbuf *p) |
| { |
| struct ip_hdr *iphdr = (struct ip_hdr *)p->payload; |
| |
| LWIP_DEBUGF(IP_DEBUG, ("IP header:\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n", |
| (u16_t)IPH_V(iphdr), |
| (u16_t)IPH_HL(iphdr), |
| (u16_t)IPH_TOS(iphdr), |
| lwip_ntohs(IPH_LEN(iphdr)))); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n", |
| lwip_ntohs(IPH_ID(iphdr)), |
| (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 15 & 1), |
| (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 14 & 1), |
| (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) >> 13 & 1), |
| (u16_t)(lwip_ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK))); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n", |
| (u16_t)IPH_TTL(iphdr), |
| (u16_t)IPH_PROTO(iphdr), |
| lwip_ntohs(IPH_CHKSUM(iphdr)))); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n", |
| ip4_addr1_16_val(iphdr->src), |
| ip4_addr2_16_val(iphdr->src), |
| ip4_addr3_16_val(iphdr->src), |
| ip4_addr4_16_val(iphdr->src))); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n", |
| ip4_addr1_16_val(iphdr->dest), |
| ip4_addr2_16_val(iphdr->dest), |
| ip4_addr3_16_val(iphdr->dest), |
| ip4_addr4_16_val(iphdr->dest))); |
| LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n")); |
| } |
| #endif /* IP_DEBUG */ |
| |
| #endif /* LWIP_IPV4 */ |