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"
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/rmlock.h>
41 #include <sys/malloc.h>
43 #include <sys/socket.h>
44 #include <sys/sysctl.h>
45 #include <sys/kernel.h>
48 #include <net/if_var.h>
49 #include <net/if_dl.h>
50 #include <net/route.h>
51 #include <net/route/route_ctl.h>
52 #include <net/route/route_var.h>
53 #include <net/route/nhop.h>
56 #include <netinet/in.h>
57 #include <netinet/in_var.h>
58 #include <netinet/ip_mroute.h>
59 #include <netinet/ip6.h>
60 #include <netinet6/in6_fib.h>
61 #include <netinet6/in6_var.h>
62 #include <netinet6/nd6.h>
63 #include <netinet6/scope6_var.h>
65 #include <net/if_types.h>
69 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
72 * Looks up path in fib @fibnum specified by @dst.
73 * Assumes scope is deembedded and provided in @scopeid.
75 * Returns path nexthop on success. Nexthop is safe to use
76 * within the current network epoch. If longer lifetime is required,
77 * one needs to pass NHR_REF as a flag. This will return referenced
81 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6,
82 uint32_t scopeid, uint32_t flags, uint32_t flowid)
86 struct radix_node *rn;
87 struct nhop_object *nh;
88 struct sockaddr_in6 sin6;
90 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
91 rh = rt_tables_get_rnh(fibnum, AF_INET6);
95 /* TODO: radix changes */
97 /* Prepare lookup key */
98 memset(&sin6, 0, sizeof(sin6));
99 sin6.sin6_len = sizeof(struct sockaddr_in6);
100 sin6.sin6_addr = *dst6;
102 /* Assume scopeid is valid and embed it directly */
103 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
104 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
107 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
108 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
109 nh = nhop_select((RNTORT(rn))->rt_nhop, flowid);
110 /* Ensure route & ifp is UP */
111 if (RT_LINK_IS_UP(nh->nh_ifp)) {
120 RTSTAT_INC(rts_unreach);
125 check_urpf_nhop(const struct nhop_object *nh, uint32_t flags,
126 const struct ifnet *src_if)
129 if (src_if != NULL && nh->nh_aifp == src_if) {
132 if (src_if == NULL) {
133 if ((flags & NHR_NODEFAULT) == 0)
135 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
143 check_urpf(struct nhop_object *nh, uint32_t flags,
144 const struct ifnet *src_if)
147 if (NH_IS_NHGRP(nh)) {
148 struct weightened_nhop *wn;
150 wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops);
151 for (int i = 0; i < num_nhops; i++) {
152 if (check_urpf_nhop(wn[i].nh, flags, src_if) != 0)
158 return (check_urpf_nhop(nh, flags, src_if));
162 * Performs reverse path forwarding lookup.
163 * If @src_if is non-zero, verifies that at least 1 path goes via
165 * If @src_if is zero, verifies that route exist.
166 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
168 * Returns 1 if route matching conditions is found, 0 otherwise.
171 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
172 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if)
176 struct radix_node *rn;
177 struct sockaddr_in6 sin6;
180 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum"));
181 rh = rt_tables_get_rnh(fibnum, AF_INET6);
185 /* TODO: radix changes */
186 /* Prepare lookup key */
187 memset(&sin6, 0, sizeof(sin6));
188 sin6.sin6_len = sizeof(struct sockaddr_in6);
189 sin6.sin6_addr = *dst6;
191 /* Assume scopeid is valid and embed it directly */
192 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
193 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
196 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
197 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
198 ret = check_urpf(RNTORT(rn)->rt_nhop, flags, src_if);
208 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6,
209 uint32_t scopeid, uint32_t flags)
212 struct radix_node *rn;
213 struct nhop_object *nh;
214 struct sockaddr_in6 sin6;
216 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
217 rh = rt_tables_get_rnh(fibnum, AF_INET6);
221 /* TODO: radix changes */
223 /* Prepare lookup key */
224 memset(&sin6, 0, sizeof(sin6));
225 sin6.sin6_len = sizeof(struct sockaddr_in6);
226 sin6.sin6_addr = *dst6;
228 /* Assume scopeid is valid and embed it directly */
229 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
230 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
232 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
233 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
234 nh = nhop_select((RNTORT(rn))->rt_nhop, 0);
235 /* Ensure route & ifp is UP */
236 if (RT_LINK_IS_UP(nh->nh_ifp)) {