246 lines
6.3 KiB
C
246 lines
6.3 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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* 3. 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_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/rmlock.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/route_var.h>
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#include <net/route/nhop.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/in_fib.h>
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#ifdef INET
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/* Verify struct route compatiblity */
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/* Assert 'struct route_in' is compatible with 'struct route' */
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CHK_STRUCT_ROUTE_COMPAT(struct route_in, ro_dst4);
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/*
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* Looks up path in fib @fibnum specified by @dst.
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* Returns path nexthop on success. Nexthop is safe to use
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* within the current network epoch. If longer lifetime is required,
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* one needs to pass NHR_REF as a flag. This will return referenced
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* nexthop.
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*/
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struct nhop_object *
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fib4_lookup(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
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uint32_t flags, uint32_t flowid)
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{
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RIB_RLOCK_TRACKER;
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struct rib_head *rh;
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struct radix_node *rn;
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struct rtentry *rt;
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struct nhop_object *nh;
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KASSERT((fibnum < rt_numfibs), ("fib4_lookup: bad fibnum"));
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rh = rt_tables_get_rnh(fibnum, AF_INET);
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if (rh == NULL)
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return (NULL);
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/* Prepare lookup key */
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struct sockaddr_in sin4;
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memset(&sin4, 0, sizeof(sin4));
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sin4.sin_family = AF_INET;
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sin4.sin_len = sizeof(struct sockaddr_in);
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sin4.sin_addr = dst;
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nh = NULL;
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RIB_RLOCK(rh);
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rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
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if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
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rt = RNTORT(rn);
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#ifdef RADIX_MPATH
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if (rt_mpath_next(rt) != NULL)
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rt = rt_mpath_selectrte(rt, flowid);
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#endif
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nh = rt->rt_nhop;
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/* Ensure route & ifp is UP */
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if (RT_LINK_IS_UP(nh->nh_ifp)) {
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if (flags & NHR_REF)
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nhop_ref_object(nh);
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RIB_RUNLOCK(rh);
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return (nh);
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}
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}
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RIB_RUNLOCK(rh);
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RTSTAT_INC(rts_unreach);
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return (NULL);
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}
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inline static int
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check_urpf(const struct nhop_object *nh, uint32_t flags,
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const struct ifnet *src_if)
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{
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if (src_if != NULL && nh->nh_aifp == src_if) {
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return (1);
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}
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if (src_if == NULL) {
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if ((flags & NHR_NODEFAULT) == 0)
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return (1);
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else if ((nh->nh_flags & NHF_DEFAULT) == 0)
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return (1);
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}
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return (0);
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}
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#ifdef RADIX_MPATH
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inline static int
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check_urpf_mpath(struct rtentry *rt, uint32_t flags,
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const struct ifnet *src_if)
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{
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while (rt != NULL) {
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if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
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return (1);
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rt = rt_mpath_next(rt);
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}
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return (0);
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}
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#endif
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/*
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* Performs reverse path forwarding lookup.
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* If @src_if is non-zero, verifies that at least 1 path goes via
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* this interface.
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* If @src_if is zero, verifies that route exist.
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* if @flags contains NHR_NOTDEFAULT, do not consider default route.
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*
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* Returns 1 if route matching conditions is found, 0 otherwise.
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*/
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int
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fib4_check_urpf(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
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uint32_t flags, const struct ifnet *src_if)
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{
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RIB_RLOCK_TRACKER;
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struct rib_head *rh;
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struct radix_node *rn;
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struct rtentry *rt;
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int ret;
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KASSERT((fibnum < rt_numfibs), ("fib4_check_urpf: bad fibnum"));
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rh = rt_tables_get_rnh(fibnum, AF_INET);
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if (rh == NULL)
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return (0);
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/* Prepare lookup key */
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struct sockaddr_in sin4;
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memset(&sin4, 0, sizeof(sin4));
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sin4.sin_len = sizeof(struct sockaddr_in);
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sin4.sin_addr = dst;
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RIB_RLOCK(rh);
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rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
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if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
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rt = RNTORT(rn);
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#ifdef RADIX_MPATH
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ret = check_urpf_mpath(rt, flags, src_if);
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#else
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ret = check_urpf(rt->rt_nhop, flags, src_if);
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#endif
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RIB_RUNLOCK(rh);
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return (ret);
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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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struct nhop_object *
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fib4_lookup_debugnet(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
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uint32_t flags)
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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 rtentry *rt;
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struct nhop_object *nh;
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KASSERT((fibnum < rt_numfibs), ("fib4_lookup_debugnet: bad fibnum"));
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rh = rt_tables_get_rnh(fibnum, AF_INET);
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if (rh == NULL)
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return (NULL);
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/* Prepare lookup key */
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struct sockaddr_in sin4;
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memset(&sin4, 0, sizeof(sin4));
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sin4.sin_family = AF_INET;
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sin4.sin_len = sizeof(struct sockaddr_in);
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sin4.sin_addr = dst;
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nh = NULL;
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/* unlocked lookup */
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rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
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if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
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rt = RNTORT(rn);
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#ifdef RADIX_MPATH
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if (rt_mpath_next(rt) != NULL)
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rt = rt_mpath_selectrte(rt, 0);
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#endif
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nh = rt->rt_nhop;
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/* Ensure route & ifp is UP */
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if (RT_LINK_IS_UP(nh->nh_ifp)) {
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if (flags & NHR_REF)
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nhop_ref_object(nh);
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return (nh);
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}
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}
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return (NULL);
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}
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#endif
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