3 * Alexander V. Chernikov <melifaro@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 #include "opt_inet6.h"
35 #include "opt_route.h"
36 #include "opt_mpath.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/rmlock.h>
42 #include <sys/malloc.h>
44 #include <sys/socket.h>
45 #include <sys/sysctl.h>
46 #include <sys/kernel.h>
49 #include <net/if_var.h>
50 #include <net/if_dl.h>
51 #include <net/route.h>
52 #include <net/route/route_var.h>
53 #include <net/route/nhop.h>
57 #include <net/radix_mpath.h>
60 #include <netinet/in.h>
61 #include <netinet/in_var.h>
62 #include <netinet/ip_mroute.h>
63 #include <netinet/ip6.h>
64 #include <netinet6/in6_fib.h>
65 #include <netinet6/in6_var.h>
66 #include <netinet6/nd6.h>
67 #include <netinet6/scope6_var.h>
69 #include <net/if_types.h>
73 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
76 * Looks up path in fib @fibnum specified by @dst.
77 * Assumes scope is deembedded and provided in @scopeid.
79 * Returns path nexthop on success. Nexthop is safe to use
80 * within the current network epoch. If longer lifetime is required,
81 * one needs to pass NHR_REF as a flag. This will return referenced
85 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6,
86 uint32_t scopeid, uint32_t flags, uint32_t flowid)
90 struct radix_node *rn;
92 struct nhop_object *nh;
93 struct sockaddr_in6 sin6;
95 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
96 rh = rt_tables_get_rnh(fibnum, AF_INET6);
100 /* TODO: radix changes */
102 /* Prepare lookup key */
103 memset(&sin6, 0, sizeof(sin6));
104 sin6.sin6_len = sizeof(struct sockaddr_in6);
105 sin6.sin6_addr = *dst6;
107 /* Assume scopeid is valid and embed it directly */
108 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
109 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
112 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
113 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
116 if (rt_mpath_next(rt) != NULL)
117 rt = rt_mpath_selectrte(rt, flowid);
120 /* Ensure route & ifp is UP */
121 if (RT_LINK_IS_UP(nh->nh_ifp)) {
130 RTSTAT_INC(rts_unreach);
135 check_urpf(const struct nhop_object *nh, uint32_t flags,
136 const struct ifnet *src_if)
139 if (src_if != NULL && nh->nh_aifp == src_if) {
142 if (src_if == NULL) {
143 if ((flags & NHR_NODEFAULT) == 0)
145 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
154 check_urpf_mpath(struct rtentry *rt, uint32_t flags,
155 const struct ifnet *src_if)
159 if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
161 rt = rt_mpath_next(rt);
169 * Performs reverse path forwarding lookup.
170 * If @src_if is non-zero, verifies that at least 1 path goes via
172 * If @src_if is zero, verifies that route exist.
173 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
175 * Returns 1 if route matching conditions is found, 0 otherwise.
178 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
179 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if)
183 struct radix_node *rn;
185 struct sockaddr_in6 sin6;
188 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum"));
189 rh = rt_tables_get_rnh(fibnum, AF_INET6);
193 /* TODO: radix changes */
194 /* Prepare lookup key */
195 memset(&sin6, 0, sizeof(sin6));
196 sin6.sin6_len = sizeof(struct sockaddr_in6);
197 sin6.sin6_addr = *dst6;
199 /* Assume scopeid is valid and embed it directly */
200 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
201 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
204 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
205 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
208 ret = check_urpf_mpath(rt, flags, src_if);
210 ret = check_urpf(rt->rt_nhop, flags, src_if);
221 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6,
222 uint32_t scopeid, uint32_t flags)
225 struct radix_node *rn;
227 struct nhop_object *nh;
228 struct sockaddr_in6 sin6;
230 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
231 rh = rt_tables_get_rnh(fibnum, AF_INET6);
235 /* TODO: radix changes */
237 /* Prepare lookup key */
238 memset(&sin6, 0, sizeof(sin6));
239 sin6.sin6_len = sizeof(struct sockaddr_in6);
240 sin6.sin6_addr = *dst6;
242 /* Assume scopeid is valid and embed it directly */
243 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
244 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
246 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
247 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
250 /* Ensure route & ifp is UP */
251 if (RT_LINK_IS_UP(nh->nh_ifp)) {