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_route.h"
35 #include "opt_mpath.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_var.h>
52 #include <net/route/nhop.h>
53 #include <net/route/shared.h>
57 #include <net/radix_mpath.h>
60 #include <netinet/in.h>
61 #include <netinet/in_var.h>
62 #include <netinet/in_fib.h>
66 /* Verify struct route compatiblity */
67 /* Assert 'struct route_in' is compatible with 'struct route' */
68 CHK_STRUCT_ROUTE_COMPAT(struct route_in, ro_dst4);
71 * Looks up path in fib @fibnum specified by @dst.
72 * Returns path nexthop on success. Nexthop is safe to use
73 * within the current network epoch. If longer lifetime is required,
74 * one needs to pass NHR_REF as a flag. This will return referenced
78 fib4_lookup(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
79 uint32_t flags, uint32_t flowid)
83 struct radix_node *rn;
85 struct nhop_object *nh;
87 KASSERT((fibnum < rt_numfibs), ("fib4_lookup: bad fibnum"));
88 rh = rt_tables_get_rnh(fibnum, AF_INET);
92 /* Prepare lookup key */
93 struct sockaddr_in sin4;
94 memset(&sin4, 0, sizeof(sin4));
95 sin4.sin_family = AF_INET;
96 sin4.sin_len = sizeof(struct sockaddr_in);
101 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
102 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
105 if (rt_mpath_next(rt) != NULL)
106 rt = rt_mpath_selectrte(rt, flowid);
109 /* Ensure route & ifp is UP */
110 if (RT_LINK_IS_UP(nh->nh_ifp)) {
119 RTSTAT_INC(rts_unreach);
124 check_urpf(const struct nhop_object *nh, uint32_t flags,
125 const struct ifnet *src_if)
128 if (src_if != NULL && nh->nh_aifp == src_if) {
131 if (src_if == NULL) {
132 if ((flags & NHR_NODEFAULT) == 0)
134 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
143 check_urpf_mpath(struct rtentry *rt, uint32_t flags,
144 const struct ifnet *src_if)
148 if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
150 rt = rt_mpath_next(rt);
158 * Performs reverse path forwarding lookup.
159 * If @src_if is non-zero, verifies that at least 1 path goes via
161 * If @src_if is zero, verifies that route exist.
162 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
164 * Returns 1 if route matching conditions is found, 0 otherwise.
167 fib4_check_urpf(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
168 uint32_t flags, const struct ifnet *src_if)
172 struct radix_node *rn;
176 KASSERT((fibnum < rt_numfibs), ("fib4_check_urpf: bad fibnum"));
177 rh = rt_tables_get_rnh(fibnum, AF_INET);
181 /* Prepare lookup key */
182 struct sockaddr_in sin4;
183 memset(&sin4, 0, sizeof(sin4));
184 sin4.sin_len = sizeof(struct sockaddr_in);
188 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
189 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
192 ret = check_urpf_mpath(rt, flags, src_if);
194 ret = check_urpf(rt->rt_nhop, flags, src_if);
205 fib4_lookup_debugnet(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
209 struct radix_node *rn;
211 struct nhop_object *nh;
213 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_debugnet: bad fibnum"));
214 rh = rt_tables_get_rnh(fibnum, AF_INET);
218 /* Prepare lookup key */
219 struct sockaddr_in sin4;
220 memset(&sin4, 0, sizeof(sin4));
221 sin4.sin_family = AF_INET;
222 sin4.sin_len = sizeof(struct sockaddr_in);
226 /* unlocked lookup */
227 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
228 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
231 if (rt_mpath_next(rt) != NULL)
232 rt = rt_mpath_selectrte(rt, 0);
235 /* Ensure route & ifp is UP */
236 if (RT_LINK_IS_UP(nh->nh_ifp)) {