277 lines
8.1 KiB
C
277 lines
8.1 KiB
C
/*-
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* Copyright (c) 2015
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* Alexander V. Chernikov <melifaro@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_route.h"
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#include "opt_mpath.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/route_var.h>
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#include <net/vnet.h>
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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_mroute.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_fib.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/scope6_var.h>
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#include <net/if_types.h>
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#ifdef INET6
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static void fib6_rte_to_nh_extended(struct rtentry *rte,
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const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6);
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static void fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
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uint32_t flags, struct nhop6_basic *pnh6);
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static struct ifnet *fib6_get_ifaifp(struct rtentry *rte);
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#define RNTORT(p) ((struct rtentry *)(p))
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/*
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* Gets real interface for the @rte.
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* Returns rt_ifp for !IFF_LOOPBACK routers.
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* Extracts "real" address interface from interface address
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* loopback routes.
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*/
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static struct ifnet *
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fib6_get_ifaifp(struct rtentry *rte)
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{
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struct ifnet *ifp;
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struct sockaddr_dl *sdl;
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ifp = rte->rt_ifp;
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if ((ifp->if_flags & IFF_LOOPBACK) &&
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rte->rt_gateway->sa_family == AF_LINK) {
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sdl = (struct sockaddr_dl *)rte->rt_gateway;
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return (ifnet_byindex(sdl->sdl_index));
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}
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return (ifp);
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}
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static void
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fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
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uint32_t flags, struct nhop6_basic *pnh6)
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{
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struct sockaddr_in6 *gw;
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/* Do explicit nexthop zero unless we're copying it */
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memset(pnh6, 0, sizeof(*pnh6));
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if ((flags & NHR_IFAIF) != 0)
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pnh6->nh_ifp = fib6_get_ifaifp(rte);
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else
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pnh6->nh_ifp = rte->rt_ifp;
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pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
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if (rte->rt_flags & RTF_GATEWAY) {
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gw = (struct sockaddr_in6 *)rte->rt_gateway;
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pnh6->nh_addr = gw->sin6_addr;
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in6_clearscope(&pnh6->nh_addr);
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} else
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pnh6->nh_addr = *dst;
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/* Set flags */
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pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
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gw = (struct sockaddr_in6 *)rt_key(rte);
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if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
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pnh6->nh_flags |= NHF_DEFAULT;
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}
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static void
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fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst,
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uint32_t flags, struct nhop6_extended *pnh6)
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{
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struct sockaddr_in6 *gw;
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/* Do explicit nexthop zero unless we're copying it */
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memset(pnh6, 0, sizeof(*pnh6));
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if ((flags & NHR_IFAIF) != 0)
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pnh6->nh_ifp = fib6_get_ifaifp(rte);
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else
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pnh6->nh_ifp = rte->rt_ifp;
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pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
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if (rte->rt_flags & RTF_GATEWAY) {
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gw = (struct sockaddr_in6 *)rte->rt_gateway;
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pnh6->nh_addr = gw->sin6_addr;
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in6_clearscope(&pnh6->nh_addr);
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} else
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pnh6->nh_addr = *dst;
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/* Set flags */
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pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
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gw = (struct sockaddr_in6 *)rt_key(rte);
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if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
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pnh6->nh_flags |= NHF_DEFAULT;
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}
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/*
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* Performs IPv6 route table lookup on @dst. Returns 0 on success.
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* Stores basic nexthop info into provided @pnh6 structure.
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* Note that
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* - nh_ifp represents logical transmit interface (rt_ifp) by default
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* - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
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* - mtu from logical transmit interface will be returned.
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* - nh_ifp cannot be safely dereferenced
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* - nh_ifp represents rt_ifp (e.g. if looking up address on
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* interface "ix0" pointer to "ix0" interface will be returned instead
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* of "lo0")
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* - howewer mtu from "transmit" interface will be returned.
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* - scope will be embedded in nh_addr
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*/
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int
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fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
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uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
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{
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struct rib_head *rh;
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struct radix_node *rn;
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struct sockaddr_in6 sin6;
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struct rtentry *rte;
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KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
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rh = rt_tables_get_rnh(fibnum, AF_INET6);
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if (rh == NULL)
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return (ENOENT);
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/* Prepare lookup key */
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_addr = *dst;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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/* Assume scopeid is valid and embed it directly */
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if (IN6_IS_SCOPE_LINKLOCAL(dst))
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sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
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RIB_RLOCK(rh);
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rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
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if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
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rte = RNTORT(rn);
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/* Ensure route & ifp is UP */
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if (RT_LINK_IS_UP(rte->rt_ifp)) {
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fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6);
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RIB_RUNLOCK(rh);
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return (0);
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}
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}
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RIB_RUNLOCK(rh);
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return (ENOENT);
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}
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/*
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* Performs IPv6 route table lookup on @dst. Returns 0 on success.
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* Stores extended nexthop info into provided @pnh6 structure.
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* Note that
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* - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
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* - in that case you need to call fib6_free_nh_ext()
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* - nh_ifp represents logical transmit interface (rt_ifp) by default
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* - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
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* - mtu from logical transmit interface will be returned.
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* - scope will be embedded in nh_addr
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*/
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int
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fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
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uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
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{
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struct rib_head *rh;
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struct radix_node *rn;
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struct sockaddr_in6 sin6;
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struct rtentry *rte;
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KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
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rh = rt_tables_get_rnh(fibnum, AF_INET6);
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if (rh == NULL)
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return (ENOENT);
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/* Prepare lookup key */
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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sin6.sin6_addr = *dst;
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/* Assume scopeid is valid and embed it directly */
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if (IN6_IS_SCOPE_LINKLOCAL(dst))
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sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
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RIB_RLOCK(rh);
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rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
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if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
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rte = RNTORT(rn);
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#ifdef RADIX_MPATH
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rte = rt_mpath_select(rte, flowid);
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if (rte == NULL) {
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RIB_RUNLOCK(rh);
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return (ENOENT);
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}
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#endif
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/* Ensure route & ifp is UP */
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if (RT_LINK_IS_UP(rte->rt_ifp)) {
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fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags,
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pnh6);
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if ((flags & NHR_REF) != 0) {
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/* TODO: Do lwref on egress ifp's */
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}
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RIB_RUNLOCK(rh);
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return (0);
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}
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}
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RIB_RUNLOCK(rh);
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return (ENOENT);
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}
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void
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fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)
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{
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}
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#endif
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