diff options
Diffstat (limited to 'lwip/src/core/ipv6/ip6.c')
| -rw-r--r-- | lwip/src/core/ipv6/ip6.c | 1492 |
1 files changed, 1492 insertions, 0 deletions
diff --git a/lwip/src/core/ipv6/ip6.c b/lwip/src/core/ipv6/ip6.c new file mode 100644 index 0000000..eda11dc --- /dev/null +++ b/lwip/src/core/ipv6/ip6.c @@ -0,0 +1,1492 @@ +/** + * @file + * + * IPv6 layer. + */ + +/* + * Copyright (c) 2010 Inico Technologies Ltd. + * 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: Ivan Delamer <delamer@inicotech.com> + * + * + * Please coordinate changes and requests with Ivan Delamer + * <delamer@inicotech.com> + */ + +#include "lwip/opt.h" + +#if LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */ + +#include "lwip/def.h" +#include "lwip/mem.h" +#include "lwip/netif.h" +#include "lwip/ip.h" +#include "lwip/ip6.h" +#include "lwip/ip6_addr.h" +#include "lwip/ip6_frag.h" +#include "lwip/icmp6.h" +#include "lwip/priv/raw_priv.h" +#include "lwip/udp.h" +#include "lwip/priv/tcp_priv.h" +#include "lwip/dhcp6.h" +#include "lwip/nd6.h" +#include "lwip/mld6.h" +#include "lwip/debug.h" +#include "lwip/stats.h" + +#ifdef LWIP_HOOK_FILENAME +#include LWIP_HOOK_FILENAME +#endif + +/** + * Finds the appropriate network interface for a given IPv6 address. It tries to select + * a netif following a sequence of heuristics: + * 1) if there is only 1 netif, return it + * 2) if the destination is a zoned address, match its zone to a netif + * 3) if the either the source or destination address is a scoped address, + * match the source address's zone (if set) or address (if not) to a netif + * 4) tries to match the destination subnet to a configured address + * 5) tries to find a router-announced route + * 6) tries to match the (unscoped) source address to the netif + * 7) returns the default netif, if configured + * + * Note that each of the two given addresses may or may not be properly zoned. + * + * @param src the source IPv6 address, if known + * @param dest the destination IPv6 address for which to find the route + * @return the netif on which to send to reach dest + */ +struct netif * +ip6_route(const ip6_addr_t *src, const ip6_addr_t *dest) +{ +#if LWIP_SINGLE_NETIF + LWIP_UNUSED_ARG(src); + LWIP_UNUSED_ARG(dest); +#else /* LWIP_SINGLE_NETIF */ + struct netif *netif; + s8_t i; + + LWIP_ASSERT_CORE_LOCKED(); + + /* If single netif configuration, fast return. */ + if ((netif_list != NULL) && (netif_list->next == NULL)) { + if (!netif_is_up(netif_list) || !netif_is_link_up(netif_list) || + (ip6_addr_has_zone(dest) && !ip6_addr_test_zone(dest, netif_list))) { + return NULL; + } + return netif_list; + } + +#if LWIP_IPV6_SCOPES + /* Special processing for zoned destination addresses. This includes link- + * local unicast addresses and interface/link-local multicast addresses. Use + * the zone to find a matching netif. If the address is not zoned, then there + * is technically no "wrong" netif to choose, and we leave routing to other + * rules; in most cases this should be the scoped-source rule below. */ + if (ip6_addr_has_zone(dest)) { + IP6_ADDR_ZONECHECK(dest); + /* Find a netif based on the zone. For custom mappings, one zone may map + * to multiple netifs, so find one that can actually send a packet. */ + NETIF_FOREACH(netif) { + if (ip6_addr_test_zone(dest, netif) && + netif_is_up(netif) && netif_is_link_up(netif)) { + return netif; + } + } + /* No matching netif found. Do no try to route to a different netif, + * as that would be a zone violation, resulting in any packets sent to + * that netif being dropped on output. */ + return NULL; + } +#endif /* LWIP_IPV6_SCOPES */ + + /* Special processing for scoped source and destination addresses. If we get + * here, the destination address does not have a zone, so either way we need + * to look at the source address, which may or may not have a zone. If it + * does, the zone is restrictive: there is (typically) only one matching + * netif for it, and we should avoid routing to any other netif as that would + * result in guaranteed zone violations. For scoped source addresses that do + * not have a zone, use (only) a netif that has that source address locally + * assigned. This case also applies to the loopback source address, which has + * an implied link-local scope. If only the destination address is scoped + * (but, again, not zoned), we still want to use only the source address to + * determine its zone because that's most likely what the user/application + * wants, regardless of whether the source address is scoped. Finally, some + * of this story also applies if scoping is disabled altogether. */ +#if LWIP_IPV6_SCOPES + if (ip6_addr_has_scope(dest, IP6_UNKNOWN) || + ip6_addr_has_scope(src, IP6_UNICAST) || +#else /* LWIP_IPV6_SCOPES */ + if (ip6_addr_islinklocal(dest) || ip6_addr_ismulticast_iflocal(dest) || + ip6_addr_ismulticast_linklocal(dest) || ip6_addr_islinklocal(src) || +#endif /* LWIP_IPV6_SCOPES */ + ip6_addr_isloopback(src)) { +#if LWIP_IPV6_SCOPES + if (ip6_addr_has_zone(src)) { + /* Find a netif matching the source zone (relatively cheap). */ + NETIF_FOREACH(netif) { + if (netif_is_up(netif) && netif_is_link_up(netif) && + ip6_addr_test_zone(src, netif)) { + return netif; + } + } + } else +#endif /* LWIP_IPV6_SCOPES */ + { + /* Find a netif matching the source address (relatively expensive). */ + NETIF_FOREACH(netif) { + if (!netif_is_up(netif) || !netif_is_link_up(netif)) { + continue; + } + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && + ip6_addr_cmp_zoneless(src, netif_ip6_addr(netif, i))) { + return netif; + } + } + } + } + /* Again, do not use any other netif in this case, as that could result in + * zone boundary violations. */ + return NULL; + } + + /* We come here only if neither source nor destination is scoped. */ + IP6_ADDR_ZONECHECK(src); + +#ifdef LWIP_HOOK_IP6_ROUTE + netif = LWIP_HOOK_IP6_ROUTE(src, dest); + if (netif != NULL) { + return netif; + } +#endif + + /* See if the destination subnet matches a configured address. In accordance + * with RFC 5942, dynamically configured addresses do not have an implied + * local subnet, and thus should be considered /128 assignments. However, as + * such, the destination address may still match a local address, and so we + * still need to check for exact matches here. By (lwIP) policy, statically + * configured addresses do always have an implied local /64 subnet. */ + NETIF_FOREACH(netif) { + if (!netif_is_up(netif) || !netif_is_link_up(netif)) { + continue; + } + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && + ip6_addr_netcmp(dest, netif_ip6_addr(netif, i)) && + (netif_ip6_addr_isstatic(netif, i) || + ip6_addr_nethostcmp(dest, netif_ip6_addr(netif, i)))) { + return netif; + } + } + } + + /* Get the netif for a suitable router-announced route. */ + netif = nd6_find_route(dest); + if (netif != NULL) { + return netif; + } + + /* Try with the netif that matches the source address. Given the earlier rule + * for scoped source addresses, this applies to unscoped addresses only. */ + if (!ip6_addr_isany(src)) { + NETIF_FOREACH(netif) { + if (!netif_is_up(netif) || !netif_is_link_up(netif)) { + continue; + } + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && + ip6_addr_cmp(src, netif_ip6_addr(netif, i))) { + return netif; + } + } + } + } + +#if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF + /* loopif is disabled, loopback traffic is passed through any netif */ + if (ip6_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 */ +#endif /* !LWIP_SINGLE_NETIF */ + + /* no matching netif found, use default netif, if up */ + if ((netif_default == NULL) || !netif_is_up(netif_default) || !netif_is_link_up(netif_default)) { + return NULL; + } + return netif_default; +} + +/** + * @ingroup ip6 + * Select the best IPv6 source address for a given destination IPv6 address. + * + * This implementation follows RFC 6724 Sec. 5 to the following extent: + * - Rules 1, 2, 3: fully implemented + * - Rules 4, 5, 5.5: not applicable + * - Rule 6: not implemented + * - Rule 7: not applicable + * - Rule 8: limited to "prefer /64 subnet match over non-match" + * + * For Rule 2, we deliberately deviate from RFC 6724 Sec. 3.1 by considering + * ULAs to be of smaller scope than global addresses, to avoid that a preferred + * ULA is picked over a deprecated global address when given a global address + * as destination, as that would likely result in broken two-way communication. + * + * As long as temporary addresses are not supported (as used in Rule 7), a + * proper implementation of Rule 8 would obviate the need to implement Rule 6. + * + * @param netif the netif on which to send a packet + * @param dest the destination we are trying to reach (possibly not properly + * zoned) + * @return the most suitable source address to use, or NULL if no suitable + * source address is found + */ +const ip_addr_t * +ip6_select_source_address(struct netif *netif, const ip6_addr_t *dest) +{ + const ip_addr_t *best_addr; + const ip6_addr_t *cand_addr; + s8_t dest_scope, cand_scope; + s8_t best_scope = IP6_MULTICAST_SCOPE_RESERVED; + u8_t i, cand_pref, cand_bits; + u8_t best_pref = 0; + u8_t best_bits = 0; + + /* Start by determining the scope of the given destination address. These + * tests are hopefully (roughly) in order of likeliness to match. */ + if (ip6_addr_isglobal(dest)) { + dest_scope = IP6_MULTICAST_SCOPE_GLOBAL; + } else if (ip6_addr_islinklocal(dest) || ip6_addr_isloopback(dest)) { + dest_scope = IP6_MULTICAST_SCOPE_LINK_LOCAL; + } else if (ip6_addr_isuniquelocal(dest)) { + dest_scope = IP6_MULTICAST_SCOPE_ORGANIZATION_LOCAL; + } else if (ip6_addr_ismulticast(dest)) { + dest_scope = ip6_addr_multicast_scope(dest); + } else if (ip6_addr_issitelocal(dest)) { + dest_scope = IP6_MULTICAST_SCOPE_SITE_LOCAL; + } else { + /* no match, consider scope global */ + dest_scope = IP6_MULTICAST_SCOPE_GLOBAL; + } + + best_addr = NULL; + + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + /* Consider only valid (= preferred and deprecated) addresses. */ + if (!ip6_addr_isvalid(netif_ip6_addr_state(netif, i))) { + continue; + } + /* Determine the scope of this candidate address. Same ordering idea. */ + cand_addr = netif_ip6_addr(netif, i); + if (ip6_addr_isglobal(cand_addr)) { + cand_scope = IP6_MULTICAST_SCOPE_GLOBAL; + } else if (ip6_addr_islinklocal(cand_addr)) { + cand_scope = IP6_MULTICAST_SCOPE_LINK_LOCAL; + } else if (ip6_addr_isuniquelocal(cand_addr)) { + cand_scope = IP6_MULTICAST_SCOPE_ORGANIZATION_LOCAL; + } else if (ip6_addr_issitelocal(cand_addr)) { + cand_scope = IP6_MULTICAST_SCOPE_SITE_LOCAL; + } else { + /* no match, treat as low-priority global scope */ + cand_scope = IP6_MULTICAST_SCOPE_RESERVEDF; + } + cand_pref = ip6_addr_ispreferred(netif_ip6_addr_state(netif, i)); + /* @todo compute the actual common bits, for longest matching prefix. */ + /* We cannot count on the destination address having a proper zone + * assignment, so do not compare zones in this case. */ + cand_bits = ip6_addr_netcmp_zoneless(cand_addr, dest); /* just 1 or 0 for now */ + if (cand_bits && ip6_addr_nethostcmp(cand_addr, dest)) { + return netif_ip_addr6(netif, i); /* Rule 1 */ + } + if ((best_addr == NULL) || /* no alternative yet */ + ((cand_scope < best_scope) && (cand_scope >= dest_scope)) || + ((cand_scope > best_scope) && (best_scope < dest_scope)) || /* Rule 2 */ + ((cand_scope == best_scope) && ((cand_pref > best_pref) || /* Rule 3 */ + ((cand_pref == best_pref) && (cand_bits > best_bits))))) { /* Rule 8 */ + /* We found a new "winning" candidate. */ + best_addr = netif_ip_addr6(netif, i); + best_scope = cand_scope; + best_pref = cand_pref; + best_bits = cand_bits; + } + } + + return best_addr; /* may be NULL */ +} + +#if LWIP_IPV6_FORWARD +/** + * Forwards an IPv6 packet. It finds an appropriate route for the + * packet, decrements the HL value of the packet, and outputs + * the packet on the appropriate interface. + * + * @param p the packet to forward (p->payload points to IP header) + * @param iphdr the IPv6 header of the input packet + * @param inp the netif on which this packet was received + */ +static void +ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp) +{ + struct netif *netif; + + /* do not forward link-local or loopback addresses */ + if (ip6_addr_islinklocal(ip6_current_dest_addr()) || + ip6_addr_isloopback(ip6_current_dest_addr())) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding link-local address.\n")); + IP6_STATS_INC(ip6.rterr); + IP6_STATS_INC(ip6.drop); + return; + } + + /* Find network interface where to forward this IP packet to. */ + netif = ip6_route(IP6_ADDR_ANY6, ip6_current_dest_addr()); + if (netif == NULL) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n", + IP6_ADDR_BLOCK1(ip6_current_dest_addr()), + IP6_ADDR_BLOCK2(ip6_current_dest_addr()), + IP6_ADDR_BLOCK3(ip6_current_dest_addr()), + IP6_ADDR_BLOCK4(ip6_current_dest_addr()), + IP6_ADDR_BLOCK5(ip6_current_dest_addr()), + IP6_ADDR_BLOCK6(ip6_current_dest_addr()), + IP6_ADDR_BLOCK7(ip6_current_dest_addr()), + IP6_ADDR_BLOCK8(ip6_current_dest_addr()))); +#if LWIP_ICMP6 + /* Don't send ICMP messages in response to ICMP messages */ + if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) { + icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE); + } +#endif /* LWIP_ICMP6 */ + IP6_STATS_INC(ip6.rterr); + IP6_STATS_INC(ip6.drop); + return; + } +#if LWIP_IPV6_SCOPES + /* Do not forward packets with a zoned (e.g., link-local) source address + * outside of their zone. We determined the zone a bit earlier, so we know + * that the address is properly zoned here, so we can safely use has_zone. + * Also skip packets with a loopback source address (link-local implied). */ + if ((ip6_addr_has_zone(ip6_current_src_addr()) && + !ip6_addr_test_zone(ip6_current_src_addr(), netif)) || + ip6_addr_isloopback(ip6_current_src_addr())) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding packet beyond its source address zone.\n")); + IP6_STATS_INC(ip6.rterr); + IP6_STATS_INC(ip6.drop); + return; + } +#endif /* LWIP_IPV6_SCOPES */ + /* Do not forward packets onto the same network interface on which + * they arrived. */ + if (netif == inp) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not bouncing packets back on incoming interface.\n")); + IP6_STATS_INC(ip6.rterr); + IP6_STATS_INC(ip6.drop); + return; + } + + /* decrement HL */ + IP6H_HOPLIM_SET(iphdr, IP6H_HOPLIM(iphdr) - 1); + /* send ICMP6 if HL == 0 */ + if (IP6H_HOPLIM(iphdr) == 0) { +#if LWIP_ICMP6 + /* Don't send ICMP messages in response to ICMP messages */ + if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) { + icmp6_time_exceeded(p, ICMP6_TE_HL); + } +#endif /* LWIP_ICMP6 */ + IP6_STATS_INC(ip6.drop); + return; + } + + if (netif->mtu && (p->tot_len > netif->mtu)) { +#if LWIP_ICMP6 + /* Don't send ICMP messages in response to ICMP messages */ + if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) { + icmp6_packet_too_big(p, netif->mtu); + } +#endif /* LWIP_ICMP6 */ + IP6_STATS_INC(ip6.drop); + return; + } + + LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: forwarding packet to %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n", + IP6_ADDR_BLOCK1(ip6_current_dest_addr()), + IP6_ADDR_BLOCK2(ip6_current_dest_addr()), + IP6_ADDR_BLOCK3(ip6_current_dest_addr()), + IP6_ADDR_BLOCK4(ip6_current_dest_addr()), + IP6_ADDR_BLOCK5(ip6_current_dest_addr()), + IP6_ADDR_BLOCK6(ip6_current_dest_addr()), + IP6_ADDR_BLOCK7(ip6_current_dest_addr()), + IP6_ADDR_BLOCK8(ip6_current_dest_addr()))); + + /* transmit pbuf on chosen interface */ + netif->output_ip6(netif, p, ip6_current_dest_addr()); + IP6_STATS_INC(ip6.fw); + IP6_STATS_INC(ip6.xmit); + return; +} +#endif /* LWIP_IPV6_FORWARD */ + +/** Return true if the current input packet should be accepted on this netif */ +static int +ip6_input_accept(struct netif *netif) +{ + /* interface is up? */ + if (netif_is_up(netif)) { + u8_t i; + /* unicast to this interface address? address configured? */ + /* If custom scopes are used, the destination zone will be tested as + * part of the local-address comparison, but we need to test the source + * scope as well (e.g., is this interface on the same link?). */ + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && + ip6_addr_cmp(ip6_current_dest_addr(), netif_ip6_addr(netif, i)) +#if IPV6_CUSTOM_SCOPES + && (!ip6_addr_has_zone(ip6_current_src_addr()) || + ip6_addr_test_zone(ip6_current_src_addr(), netif)) +#endif /* IPV6_CUSTOM_SCOPES */ + ) { + /* accept on this netif */ + return 1; + } + } + } + return 0; +} + +/** + * This function is called by the network interface device driver when + * an IPv6 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 ip6_forward). + * + * Finally, the packet is sent to the upper layer protocol input function. + * + * @param p the received IPv6 packet (p->payload points to IPv6 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 +ip6_input(struct pbuf *p, struct netif *inp) +{ + struct ip6_hdr *ip6hdr; + struct netif *netif; + const u8_t *nexth; + u16_t hlen, hlen_tot; /* the current header length */ +#if 0 /*IP_ACCEPT_LINK_LAYER_ADDRESSING*/ + @todo + int check_ip_src=1; +#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */ +#if LWIP_RAW + raw_input_state_t raw_status; +#endif /* LWIP_RAW */ + + LWIP_ASSERT_CORE_LOCKED(); + + IP6_STATS_INC(ip6.recv); + + /* identify the IP header */ + ip6hdr = (struct ip6_hdr *)p->payload; + if (IP6H_V(ip6hdr) != 6) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IPv6 packet dropped due to bad version number %"U32_F"\n", + IP6H_V(ip6hdr))); + pbuf_free(p); + IP6_STATS_INC(ip6.err); + IP6_STATS_INC(ip6.drop); + return ERR_OK; + } + +#ifdef LWIP_HOOK_IP6_INPUT + if (LWIP_HOOK_IP6_INPUT(p, inp)) { + /* the packet has been eaten */ + return ERR_OK; + } +#endif + + /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */ + if ((IP6_HLEN > p->len) || (IP6H_PLEN(ip6hdr) > (p->tot_len - IP6_HLEN))) { + if (IP6_HLEN > p->len) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n", + (u16_t)IP6_HLEN, p->len)); + } + if ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 (plen %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n", + (u16_t)(IP6H_PLEN(ip6hdr) + IP6_HLEN), p->tot_len)); + } + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_STATS_INC(ip6.lenerr); + IP6_STATS_INC(ip6.drop); + return ERR_OK; + } + + /* Trim pbuf. This should have been done at the netif layer, + * but we'll do it anyway just to be sure that its done. */ + pbuf_realloc(p, (u16_t)(IP6_HLEN + IP6H_PLEN(ip6hdr))); + + /* copy IP addresses to aligned ip6_addr_t */ + ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_dest, ip6hdr->dest); + ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_src, ip6hdr->src); + + /* Don't accept virtual IPv4 mapped IPv6 addresses. + * Don't accept multicast source addresses. */ + if (ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_dest)) || + ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_src)) || + ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_src))) { + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_STATS_INC(ip6.err); + IP6_STATS_INC(ip6.drop); + return ERR_OK; + } + + /* Set the appropriate zone identifier on the addresses. */ + ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_dest), IP6_UNKNOWN, inp); + ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_src), IP6_UNICAST, inp); + + /* current header pointer. */ + ip_data.current_ip6_header = ip6hdr; + + /* In netif, used in case we need to send ICMPv6 packets back. */ + ip_data.current_netif = inp; + ip_data.current_input_netif = inp; + + /* match packet against an interface, i.e. is this packet for us? */ + if (ip6_addr_ismulticast(ip6_current_dest_addr())) { + /* Always joined to multicast if-local and link-local all-nodes group. */ + if (ip6_addr_isallnodes_iflocal(ip6_current_dest_addr()) || + ip6_addr_isallnodes_linklocal(ip6_current_dest_addr())) { + netif = inp; + } +#if LWIP_IPV6_MLD + else if (mld6_lookfor_group(inp, ip6_current_dest_addr())) { + netif = inp; + } +#else /* LWIP_IPV6_MLD */ + else if (ip6_addr_issolicitednode(ip6_current_dest_addr())) { + u8_t i; + /* Filter solicited node packets when MLD is not enabled + * (for Neighbor discovery). */ + netif = NULL; + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(inp, i)) && + ip6_addr_cmp_solicitednode(ip6_current_dest_addr(), netif_ip6_addr(inp, i))) { + netif = inp; + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: solicited node packet accepted on interface %c%c\n", + netif->name[0], netif->name[1])); + break; + } + } + } +#endif /* LWIP_IPV6_MLD */ + else { + netif = NULL; + } + } else { + /* start trying with inp. if that's not acceptable, start walking the + list of configured netifs. */ + if (ip6_input_accept(inp)) { + netif = inp; + } else { + netif = NULL; +#if !IPV6_CUSTOM_SCOPES + /* Shortcut: stop looking for other interfaces if either the source or + * the destination has a scope constrained to this interface. Custom + * scopes may break the 1:1 link/interface mapping, however. */ + if (ip6_addr_islinklocal(ip6_current_dest_addr()) || + ip6_addr_islinklocal(ip6_current_src_addr())) { + goto netif_found; + } +#endif /* !IPV6_CUSTOM_SCOPES */ +#if !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF + /* The loopback address is to be considered link-local. Packets to it + * should be dropped on other interfaces, as per RFC 4291 Sec. 2.5.3. + * Its implied scope means packets *from* the loopback address should + * not be accepted on other interfaces, either. These requirements + * cannot be implemented in the case that loopback traffic is sent + * across a non-loopback interface, however. */ + if (ip6_addr_isloopback(ip6_current_dest_addr()) || + ip6_addr_isloopback(ip6_current_src_addr())) { + goto netif_found; + } +#endif /* !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF */ +#if !LWIP_SINGLE_NETIF + NETIF_FOREACH(netif) { + if (netif == inp) { + /* we checked that before already */ + continue; + } + if (ip6_input_accept(netif)) { + break; + } + } +#endif /* !LWIP_SINGLE_NETIF */ + } +netif_found: + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet accepted on interface %c%c\n", + netif ? netif->name[0] : 'X', netif? netif->name[1] : 'X')); + } + + /* "::" packet source address? (used in duplicate address detection) */ + if (ip6_addr_isany(ip6_current_src_addr()) && + (!ip6_addr_issolicitednode(ip6_current_dest_addr()))) { + /* packet source is not valid */ + /* free (drop) packet pbufs */ + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with src ANY_ADDRESS dropped\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + /* packet not for us? */ + if (netif == NULL) { + /* packet not for us, route or discard */ + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_TRACE, ("ip6_input: packet not for us.\n")); +#if LWIP_IPV6_FORWARD + /* non-multicast packet? */ + if (!ip6_addr_ismulticast(ip6_current_dest_addr())) { + /* try to forward IP packet on (other) interfaces */ + ip6_forward(p, ip6hdr, inp); + } +#endif /* LWIP_IPV6_FORWARD */ + pbuf_free(p); + goto ip6_input_cleanup; + } + + /* current netif pointer. */ + ip_data.current_netif = netif; + + /* Save next header type. */ + nexth = &IP6H_NEXTH(ip6hdr); + + /* Init header length. */ + hlen = hlen_tot = IP6_HLEN; + + /* Move to payload. */ + pbuf_remove_header(p, IP6_HLEN); + + /* Process known option extension headers, if present. */ + while (*nexth != IP6_NEXTH_NONE) + { + switch (*nexth) { + case IP6_NEXTH_HOPBYHOP: + { + s32_t opt_offset; + struct ip6_hbh_hdr *hbh_hdr; + struct ip6_opt_hdr *opt_hdr; + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header\n")); + + /* Get and check the header length, while staying in packet bounds. */ + hbh_hdr = (struct ip6_hbh_hdr *)p->payload; + + /* Get next header type. */ + nexth = &IP6_HBH_NEXTH(hbh_hdr); + + /* Get the header length. */ + hlen = (u16_t)(8 * (1 + hbh_hdr->_hlen)); + + if ((p->len < 8) || (hlen > p->len)) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n", + hlen, p->len)); + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_STATS_INC(ip6.lenerr); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + hlen_tot = (u16_t)(hlen_tot + hlen); + + /* The extended option header starts right after Hop-by-Hop header. */ + opt_offset = IP6_HBH_HLEN; + while (opt_offset < hlen) + { + s32_t opt_dlen = 0; + + opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + opt_offset); + + switch (IP6_OPT_TYPE(opt_hdr)) { + /* @todo: process IPV6 Hop-by-Hop option data */ + case IP6_PAD1_OPTION: + /* PAD1 option doesn't have length and value field */ + opt_dlen = -1; + break; + case IP6_PADN_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + case IP6_ROUTER_ALERT_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + case IP6_JUMBO_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + default: + /* Check 2 MSB of Hop-by-Hop header type. */ + switch (IP6_OPT_TYPE_ACTION(opt_hdr)) { + case 1: + /* Discard the packet. */ + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + case 2: + /* Send ICMP Parameter Problem */ + icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + case 3: + /* Send ICMP Parameter Problem if destination address is not a multicast address */ + if (!ip6_addr_ismulticast(ip6_current_dest_addr())) { + icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr); + } + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid Hop-by-Hop option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + default: + /* Skip over this option. */ + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + } + break; + } + + /* Adjust the offset to move to the next extended option header */ + opt_offset = opt_offset + IP6_OPT_HLEN + opt_dlen; + } + pbuf_remove_header(p, hlen); + break; + } + case IP6_NEXTH_DESTOPTS: + { + s32_t opt_offset; + struct ip6_dest_hdr *dest_hdr; + struct ip6_opt_hdr *opt_hdr; + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Destination options header\n")); + + dest_hdr = (struct ip6_dest_hdr *)p->payload; + + /* Get next header type. */ + nexth = &IP6_DEST_NEXTH(dest_hdr); + + /* Get the header length. */ + hlen = 8 * (1 + dest_hdr->_hlen); + if ((p->len < 8) || (hlen > p->len)) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n", + hlen, p->len)); + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_STATS_INC(ip6.lenerr); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + hlen_tot = (u16_t)(hlen_tot + hlen); + + /* The extended option header starts right after Destination header. */ + opt_offset = IP6_DEST_HLEN; + while (opt_offset < hlen) + { + s32_t opt_dlen = 0; + + opt_hdr = (struct ip6_opt_hdr *)((u8_t *)dest_hdr + opt_offset); + + switch (IP6_OPT_TYPE(opt_hdr)) + { + /* @todo: process IPV6 Destination option data */ + case IP6_PAD1_OPTION: + /* PAD1 option deosn't have length and value field */ + opt_dlen = -1; + break; + case IP6_PADN_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + case IP6_ROUTER_ALERT_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + case IP6_JUMBO_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + case IP6_HOME_ADDRESS_OPTION: + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + default: + /* Check 2 MSB of Destination header type. */ + switch (IP6_OPT_TYPE_ACTION(opt_hdr)) + { + case 1: + /* Discard the packet. */ + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + case 2: + /* Send ICMP Parameter Problem */ + icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + case 3: + /* Send ICMP Parameter Problem if destination address is not a multicast address */ + if (!ip6_addr_ismulticast(ip6_current_dest_addr())) { + icmp6_param_problem(p, ICMP6_PP_OPTION, opt_hdr); + } + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid destination option type dropped.\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + default: + /* Skip over this option. */ + opt_dlen = IP6_OPT_DLEN(opt_hdr); + break; + } + break; + } + + /* Adjust the offset to move to the next extended option header */ + opt_offset = opt_offset + IP6_OPT_HLEN + opt_dlen; + } + + pbuf_remove_header(p, hlen); + break; + } + case IP6_NEXTH_ROUTING: + { + struct ip6_rout_hdr *rout_hdr; + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Routing header\n")); + + rout_hdr = (struct ip6_rout_hdr *)p->payload; + + /* Get next header type. */ + nexth = &IP6_ROUT_NEXTH(rout_hdr); + + /* Get the header length. */ + hlen = 8 * (1 + rout_hdr->_hlen); + + if ((p->len < 8) || (hlen > p->len)) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n", + hlen, p->len)); + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_STATS_INC(ip6.lenerr); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + /* Skip over this header. */ + hlen_tot = (u16_t)(hlen_tot + hlen); + + /* if segment left value is 0 in routing header, ignore the option */ + if (IP6_ROUT_SEG_LEFT(rout_hdr)) { + /* The length field of routing option header must be even */ + if (rout_hdr->_hlen & 0x1) { + /* Discard and send parameter field error */ + icmp6_param_problem(p, ICMP6_PP_FIELD, &rout_hdr->_hlen); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid routing type dropped\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + switch (IP6_ROUT_TYPE(rout_hdr)) + { + /* TODO: process routing by the type */ + case IP6_ROUT_TYPE2: + break; + case IP6_ROUT_RPL: + break; + default: + /* Discard unrecognized routing type and send parameter field error */ + icmp6_param_problem(p, ICMP6_PP_FIELD, &IP6_ROUT_TYPE(rout_hdr)); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid routing type dropped\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + } + + pbuf_remove_header(p, hlen); + break; + } + case IP6_NEXTH_FRAGMENT: + { + struct ip6_frag_hdr *frag_hdr; + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header\n")); + + frag_hdr = (struct ip6_frag_hdr *)p->payload; + + /* Get next header type. */ + nexth = &IP6_FRAG_NEXTH(frag_hdr); + + /* Fragment Header length. */ + hlen = 8; + + /* Make sure this header fits in current pbuf. */ + if (hlen > p->len) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, + ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n", + hlen, p->len)); + /* free (drop) packet pbufs */ + pbuf_free(p); + IP6_FRAG_STATS_INC(ip6_frag.lenerr); + IP6_FRAG_STATS_INC(ip6_frag.drop); + goto ip6_input_cleanup; + } + + hlen_tot = (u16_t)(hlen_tot + hlen); + + /* check payload length is multiple of 8 octets when mbit is set */ + if (IP6_FRAG_MBIT(frag_hdr) && (IP6H_PLEN(ip6hdr) & 0x7)) { + /* ipv6 payload length is not multiple of 8 octets */ + icmp6_param_problem(p, ICMP6_PP_FIELD, LWIP_PACKED_CAST(const void *, &ip6hdr->_plen)); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with invalid payload length dropped\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + + /* Offset == 0 and more_fragments == 0? */ + if ((frag_hdr->_fragment_offset & + PP_HTONS(IP6_FRAG_OFFSET_MASK | IP6_FRAG_MORE_FLAG)) == 0) { + /* This is a 1-fragment packet. Skip this header and continue. */ + pbuf_remove_header(p, hlen); + } else { +#if LWIP_IPV6_REASS + /* reassemble the packet */ + ip_data.current_ip_header_tot_len = hlen_tot; + p = ip6_reass(p); + /* packet not fully reassembled yet? */ + if (p == NULL) { + goto ip6_input_cleanup; + } + + /* Returned p point to IPv6 header. + * Update all our variables and pointers and continue. */ + ip6hdr = (struct ip6_hdr *)p->payload; + nexth = &IP6H_NEXTH(ip6hdr); + hlen = hlen_tot = IP6_HLEN; + pbuf_remove_header(p, IP6_HLEN); + +#else /* LWIP_IPV6_REASS */ + /* free (drop) packet pbufs */ + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header dropped (with LWIP_IPV6_REASS==0)\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.opterr); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; +#endif /* LWIP_IPV6_REASS */ + } + break; + } + default: + goto options_done; + } + + if (*nexth == IP6_NEXTH_HOPBYHOP) { + /* Hop-by-Hop header comes only as a first option */ + icmp6_param_problem(p, ICMP6_PP_HEADER, nexth); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header dropped (only valid as a first option)\n")); + pbuf_free(p); + IP6_STATS_INC(ip6.drop); + goto ip6_input_cleanup; + } + } + +options_done: + + /* send to upper layers */ + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: \n")); + ip6_debug_print(p); + LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len)); + + ip_data.current_ip_header_tot_len = hlen_tot; + +#if LWIP_RAW + /* p points to IPv6 header again for raw_input. */ + pbuf_add_header_force(p, hlen_tot); + /* raw input did not eat the packet? */ + raw_status = raw_input(p, inp); + if (raw_status != RAW_INPUT_EATEN) + { + /* Point to payload. */ + pbuf_remove_header(p, hlen_tot); +#else /* LWIP_RAW */ + { +#endif /* LWIP_RAW */ + switch (*nexth) { + case IP6_NEXTH_NONE: + pbuf_free(p); + break; +#if LWIP_UDP + case IP6_NEXTH_UDP: +#if LWIP_UDPLITE + case IP6_NEXTH_UDPLITE: +#endif /* LWIP_UDPLITE */ + udp_input(p, inp); + break; +#endif /* LWIP_UDP */ +#if LWIP_TCP + case IP6_NEXTH_TCP: + tcp_input(p, inp); + break; +#endif /* LWIP_TCP */ +#if LWIP_ICMP6 + case IP6_NEXTH_ICMP6: + icmp6_input(p, inp); + break; +#endif /* LWIP_ICMP */ + default: +#if LWIP_RAW + if (raw_status == RAW_INPUT_DELIVERED) { + /* @todo: ipv6 mib in-delivers? */ + } else +#endif /* LWIP_RAW */ + { +#if LWIP_ICMP6 + /* p points to IPv6 header again for raw_input. */ + pbuf_add_header_force(p, hlen_tot); + /* send ICMP parameter problem unless it was a multicast or ICMPv6 */ + if ((!ip6_addr_ismulticast(ip6_current_dest_addr())) && + (IP6H_NEXTH(ip6hdr) != IP6_NEXTH_ICMP6)) { + icmp6_param_problem(p, ICMP6_PP_HEADER, nexth); + } +#endif /* LWIP_ICMP */ + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_input: Unsupported transport protocol %"U16_F"\n", (u16_t)IP6H_NEXTH(ip6hdr))); + IP6_STATS_INC(ip6.proterr); + IP6_STATS_INC(ip6.drop); + } + pbuf_free(p); + break; + } + } + +ip6_input_cleanup: + ip_data.current_netif = NULL; + ip_data.current_input_netif = NULL; + ip_data.current_ip6_header = NULL; + ip_data.current_ip_header_tot_len = 0; + ip6_addr_set_zero(ip6_current_src_addr()); + ip6_addr_set_zero(ip6_current_dest_addr()); + + return ERR_OK; +} + + +/** + * Sends an IPv6 packet on a network interface. This function constructs + * the IPv6 header. If the source IPv6 address is NULL, the IPv6 "ANY" address is + * used as source (usually during network startup). If the source IPv6 address it + * IP6_ADDR_ANY, the most appropriate IPv6 address of the outgoing network + * interface is filled in as source address. If the destination IPv6 address is + * LWIP_IP_HDRINCL, p is assumed to already include an IPv6 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 + IPv6 header and p->payload points to that IPv6 header) + * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an + * IP address of the netif is selected and used as source address. + * if src == NULL, IP6_ADDR_ANY is used as source) (src is possibly not + * properly zoned) + * @param dest the destination IPv6 address to send the packet to (possibly not + * properly zoned) + * @param hl the Hop Limit value to be set in the IPv6 header + * @param tc the Traffic Class value to be set in the IPv6 header + * @param nexth the Next Header to be set in the IPv6 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 IPv6/LINK headers + * returns errors returned by netif->output_ip6 + */ +err_t +ip6_output_if(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest, + u8_t hl, u8_t tc, + u8_t nexth, struct netif *netif) +{ + const ip6_addr_t *src_used = src; + if (dest != LWIP_IP_HDRINCL) { + if (src != NULL && ip6_addr_isany(src)) { + src_used = ip_2_ip6(ip6_select_source_address(netif, dest)); + if ((src_used == NULL) || ip6_addr_isany(src_used)) { + /* No appropriate source address was found for this packet. */ + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: No suitable source address for packet.\n")); + IP6_STATS_INC(ip6.rterr); + return ERR_RTE; + } + } + } + return ip6_output_if_src(p, src_used, dest, hl, tc, nexth, netif); +} + +/** + * Same as ip6_output_if() but 'src' address is not replaced by netif address + * when it is 'any'. + */ +err_t +ip6_output_if_src(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest, + u8_t hl, u8_t tc, + u8_t nexth, struct netif *netif) +{ + struct ip6_hdr *ip6hdr; + ip6_addr_t dest_addr; + + LWIP_ASSERT_CORE_LOCKED(); + LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); + + /* Should the IPv6 header be generated or is it already included in p? */ + if (dest != LWIP_IP_HDRINCL) { +#if LWIP_IPV6_SCOPES + /* If the destination address is scoped but lacks a zone, add a zone now, + * based on the outgoing interface. The lower layers (e.g., nd6) absolutely + * require addresses to be properly zoned for correctness. In some cases, + * earlier attempts will have been made to add a zone to the destination, + * but this function is the only one that is called in all (other) cases, + * so we must do this here. */ + if (ip6_addr_lacks_zone(dest, IP6_UNKNOWN)) { + ip6_addr_copy(dest_addr, *dest); + ip6_addr_assign_zone(&dest_addr, IP6_UNKNOWN, netif); + dest = &dest_addr; + } +#endif /* LWIP_IPV6_SCOPES */ + + /* generate IPv6 header */ + if (pbuf_add_header(p, IP6_HLEN)) { + LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: not enough room for IPv6 header in pbuf\n")); + IP6_STATS_INC(ip6.err); + return ERR_BUF; + } + + ip6hdr = (struct ip6_hdr *)p->payload; + LWIP_ASSERT("check that first pbuf can hold struct ip6_hdr", + (p->len >= sizeof(struct ip6_hdr))); + + IP6H_HOPLIM_SET(ip6hdr, hl); + IP6H_NEXTH_SET(ip6hdr, nexth); + + /* dest cannot be NULL here */ + ip6_addr_copy_to_packed(ip6hdr->dest, *dest); + + IP6H_VTCFL_SET(ip6hdr, 6, tc, 0); + IP6H_PLEN_SET(ip6hdr, (u16_t)(p->tot_len - IP6_HLEN)); + + if (src == NULL) { + src = IP6_ADDR_ANY6; + } + /* src cannot be NULL here */ + ip6_addr_copy_to_packed(ip6hdr->src, *src); + + } else { + /* IP header already included in p */ + ip6hdr = (struct ip6_hdr *)p->payload; + ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest); + ip6_addr_assign_zone(&dest_addr, IP6_UNKNOWN, netif); + dest = &dest_addr; + } + + IP6_STATS_INC(ip6.xmit); + + LWIP_DEBUGF(IP6_DEBUG, ("ip6_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], (u16_t)netif->num)); + ip6_debug_print(p); + +#if ENABLE_LOOPBACK + { + int i; +#if !LWIP_HAVE_LOOPIF + if (ip6_addr_isloopback(dest)) { + return netif_loop_output(netif, p); + } +#endif /* !LWIP_HAVE_LOOPIF */ + for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) { + if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && + ip6_addr_cmp(dest, netif_ip6_addr(netif, i))) { + /* Packet to self, enqueue it for loopback */ + LWIP_DEBUGF(IP6_DEBUG, ("netif_loop_output()\n")); + 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 LWIP_IPV6_FRAG + /* don't fragment if interface has mtu set to 0 [loopif] */ + if (netif_mtu6(netif) && (p->tot_len > nd6_get_destination_mtu(dest, netif))) { + return ip6_frag(p, netif, dest); + } +#endif /* LWIP_IPV6_FRAG */ + + LWIP_DEBUGF(IP6_DEBUG, ("netif->output_ip6()\n")); + return netif->output_ip6(netif, p, dest); +} + +/** + * Simple interface to ip6_output_if. It finds the outgoing network + * interface and calls upon ip6_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 + IPv6 header and p->payload points to that IPv6 header) + * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an + * IP address of the netif is selected and used as source address. + * if src == NULL, IP6_ADDR_ANY is used as source) + * @param dest the destination IPv6 address to send the packet to + * @param hl the Hop Limit value to be set in the IPv6 header + * @param tc the Traffic Class value to be set in the IPv6 header + * @param nexth the Next Header to be set in the IPv6 header + * + * @return ERR_RTE if no route is found + * see ip_output_if() for more return values + */ +err_t +ip6_output(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest, + u8_t hl, u8_t tc, u8_t nexth) +{ + struct netif *netif; + struct ip6_hdr *ip6hdr; + ip6_addr_t src_addr, dest_addr; + + LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); + + if (dest != LWIP_IP_HDRINCL) { + netif = ip6_route(src, dest); + } else { + /* IP header included in p, read addresses. */ + ip6hdr = (struct ip6_hdr *)p->payload; + ip6_addr_copy_from_packed(src_addr, ip6hdr->src); + ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest); + netif = ip6_route(&src_addr, &dest_addr); + } + + if (netif == NULL) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n", + IP6_ADDR_BLOCK1(dest), + IP6_ADDR_BLOCK2(dest), + IP6_ADDR_BLOCK3(dest), + IP6_ADDR_BLOCK4(dest), + IP6_ADDR_BLOCK5(dest), + IP6_ADDR_BLOCK6(dest), + IP6_ADDR_BLOCK7(dest), + IP6_ADDR_BLOCK8(dest))); + IP6_STATS_INC(ip6.rterr); + return ERR_RTE; + } + + return ip6_output_if(p, src, dest, hl, tc, nexth, netif); +} + + +#if LWIP_NETIF_USE_HINTS +/** Like ip6_output, but takes and addr_hint pointer that is passed on to netif->addr_hint + * before calling ip6_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 + IPv6 header and p->payload points to that IPv6 header) + * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an + * IP address of the netif is selected and used as source address. + * if src == NULL, IP6_ADDR_ANY is used as source) + * @param dest the destination IPv6 address to send the packet to + * @param hl the Hop Limit value to be set in the IPv6 header + * @param tc the Traffic Class value to be set in the IPv6 header + * @param nexth the Next Header to be set in the IPv6 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 +ip6_output_hinted(struct pbuf *p, const ip6_addr_t *src, const ip6_addr_t *dest, + u8_t hl, u8_t tc, u8_t nexth, struct netif_hint *netif_hint) +{ + struct netif *netif; + struct ip6_hdr *ip6hdr; + ip6_addr_t src_addr, dest_addr; + err_t err; + + LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p); + + if (dest != LWIP_IP_HDRINCL) { + netif = ip6_route(src, dest); + } else { + /* IP header included in p, read addresses. */ + ip6hdr = (struct ip6_hdr *)p->payload; + ip6_addr_copy_from_packed(src_addr, ip6hdr->src); + ip6_addr_copy_from_packed(dest_addr, ip6hdr->dest); + netif = ip6_route(&src_addr, &dest_addr); + } + + if (netif == NULL) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n", + IP6_ADDR_BLOCK1(dest), + IP6_ADDR_BLOCK2(dest), + IP6_ADDR_BLOCK3(dest), + IP6_ADDR_BLOCK4(dest), + IP6_ADDR_BLOCK5(dest), + IP6_ADDR_BLOCK6(dest), + IP6_ADDR_BLOCK7(dest), + IP6_ADDR_BLOCK8(dest))); + IP6_STATS_INC(ip6.rterr); + return ERR_RTE; + } + + NETIF_SET_HINTS(netif, netif_hint); + err = ip6_output_if(p, src, dest, hl, tc, nexth, netif); + NETIF_RESET_HINTS(netif); + + return err; +} +#endif /* LWIP_NETIF_USE_HINTS*/ + +#if LWIP_IPV6_MLD +/** + * Add a hop-by-hop options header with a router alert option and padding. + * + * Used by MLD when sending a Multicast listener report/done message. + * + * @param p the packet to which we will prepend the options header + * @param nexth the next header protocol number (e.g. IP6_NEXTH_ICMP6) + * @param value the value of the router alert option data (e.g. IP6_ROUTER_ALERT_VALUE_MLD) + * @return ERR_OK if hop-by-hop header was added, ERR_* otherwise + */ +err_t +ip6_options_add_hbh_ra(struct pbuf *p, u8_t nexth, u8_t value) +{ + u8_t *opt_data; + u32_t offset = 0; + struct ip6_hbh_hdr *hbh_hdr; + struct ip6_opt_hdr *opt_hdr; + + /* fixed 4 bytes for router alert option and 2 bytes padding */ + const u8_t hlen = (sizeof(struct ip6_opt_hdr) * 2) + IP6_ROUTER_ALERT_DLEN; + /* Move pointer to make room for hop-by-hop options header. */ + if (pbuf_add_header(p, sizeof(struct ip6_hbh_hdr) + hlen)) { + LWIP_DEBUGF(IP6_DEBUG, ("ip6_options: no space for options header\n")); + IP6_STATS_INC(ip6.err); + return ERR_BUF; + } + + /* Set fields of Hop-by-Hop header */ + hbh_hdr = (struct ip6_hbh_hdr *)p->payload; + IP6_HBH_NEXTH(hbh_hdr) = nexth; + hbh_hdr->_hlen = 0; + offset = IP6_HBH_HLEN; + + /* Set router alert options to Hop-by-Hop extended option header */ + opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + offset); + IP6_OPT_TYPE(opt_hdr) = IP6_ROUTER_ALERT_OPTION; + IP6_OPT_DLEN(opt_hdr) = IP6_ROUTER_ALERT_DLEN; + offset += IP6_OPT_HLEN; + + /* Set router alert option data */ + opt_data = (u8_t *)hbh_hdr + offset; + opt_data[0] = value; + opt_data[1] = 0; + offset += IP6_OPT_DLEN(opt_hdr); + + /* add 2 bytes padding to make 8 bytes Hop-by-Hop header length */ + opt_hdr = (struct ip6_opt_hdr *)((u8_t *)hbh_hdr + offset); + IP6_OPT_TYPE(opt_hdr) = IP6_PADN_OPTION; + IP6_OPT_DLEN(opt_hdr) = 0; + + return ERR_OK; +} +#endif /* LWIP_IPV6_MLD */ + +#if IP6_DEBUG +/* Print an IPv6 header by using LWIP_DEBUGF + * @param p an IPv6 packet, p->payload pointing to the IPv6 header + */ +void +ip6_debug_print(struct pbuf *p) +{ + struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload; + + LWIP_DEBUGF(IP6_DEBUG, ("IPv6 header:\n")); + LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n")); + LWIP_DEBUGF(IP6_DEBUG, ("| %2"U16_F" | %3"U16_F" | %7"U32_F" | (ver, class, flow)\n", + IP6H_V(ip6hdr), + IP6H_TC(ip6hdr), + IP6H_FL(ip6hdr))); + LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n")); + LWIP_DEBUGF(IP6_DEBUG, ("| %5"U16_F" | %3"U16_F" | %3"U16_F" | (plen, nexth, hopl)\n", + IP6H_PLEN(ip6hdr), + IP6H_NEXTH(ip6hdr), + IP6H_HOPLIM(ip6hdr))); + LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n")); + LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (src)\n", + IP6_ADDR_BLOCK1(&(ip6hdr->src)), + IP6_ADDR_BLOCK2(&(ip6hdr->src)), + IP6_ADDR_BLOCK3(&(ip6hdr->src)), + IP6_ADDR_BLOCK4(&(ip6hdr->src)))); + LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n", + IP6_ADDR_BLOCK5(&(ip6hdr->src)), + IP6_ADDR_BLOCK6(&(ip6hdr->src)), + IP6_ADDR_BLOCK7(&(ip6hdr->src)), + IP6_ADDR_BLOCK8(&(ip6hdr->src)))); + LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n")); + LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (dest)\n", + IP6_ADDR_BLOCK1(&(ip6hdr->dest)), + IP6_ADDR_BLOCK2(&(ip6hdr->dest)), + IP6_ADDR_BLOCK3(&(ip6hdr->dest)), + IP6_ADDR_BLOCK4(&(ip6hdr->dest)))); + LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n", + IP6_ADDR_BLOCK5(&(ip6hdr->dest)), + IP6_ADDR_BLOCK6(&(ip6hdr->dest)), + IP6_ADDR_BLOCK7(&(ip6hdr->dest)), + IP6_ADDR_BLOCK8(&(ip6hdr->dest)))); + LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n")); +} +#endif /* IP6_DEBUG */ + +#endif /* LWIP_IPV6 */ |