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"
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/rmlock.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sysctl.h>
44 #include <sys/kernel.h>
47 #include <net/if_var.h>
48 #include <net/if_dl.h>
49 #include <net/route.h>
50 #include <net/route/route_ctl.h>
51 #include <net/route/route_var.h>
52 #include <net/route/nhop.h>
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/in_fib.h>
61 /* Verify struct route compatiblity */
62 /* Assert 'struct route_in' is compatible with 'struct route' */
63 CHK_STRUCT_ROUTE_COMPAT(struct route_in, ro_dst4);
66 * Looks up path in fib @fibnum specified by @dst.
67 * Returns path nexthop on success. Nexthop is safe to use
68 * within the current network epoch. If longer lifetime is required,
69 * one needs to pass NHR_REF as a flag. This will return referenced
73 fib4_lookup(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
74 uint32_t flags, uint32_t flowid)
78 struct radix_node *rn;
79 struct nhop_object *nh;
81 KASSERT((fibnum < rt_numfibs), ("fib4_lookup: bad fibnum"));
82 rh = rt_tables_get_rnh(fibnum, AF_INET);
86 /* Prepare lookup key */
87 struct sockaddr_in sin4;
88 memset(&sin4, 0, sizeof(sin4));
89 sin4.sin_family = AF_INET;
90 sin4.sin_len = sizeof(struct sockaddr_in);
95 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
96 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
97 nh = nhop_select((RNTORT(rn))->rt_nhop, flowid);
98 /* Ensure route & ifp is UP */
99 if (RT_LINK_IS_UP(nh->nh_ifp)) {
108 RTSTAT_INC(rts_unreach);
113 check_urpf_nhop(const struct nhop_object *nh, uint32_t flags,
114 const struct ifnet *src_if)
117 if (src_if != NULL && nh->nh_aifp == src_if) {
120 if (src_if == NULL) {
121 if ((flags & NHR_NODEFAULT) == 0)
123 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
131 check_urpf(struct nhop_object *nh, uint32_t flags,
132 const struct ifnet *src_if)
135 if (NH_IS_NHGRP(nh)) {
136 struct weightened_nhop *wn;
138 wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops);
139 for (int i = 0; i < num_nhops; i++) {
140 if (check_urpf_nhop(wn[i].nh, flags, src_if) != 0)
146 return (check_urpf_nhop(nh, flags, src_if));
150 * Performs reverse path forwarding lookup.
151 * If @src_if is non-zero, verifies that at least 1 path goes via
153 * If @src_if is zero, verifies that route exist.
154 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
156 * Returns 1 if route matching conditions is found, 0 otherwise.
159 fib4_check_urpf(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
160 uint32_t flags, const struct ifnet *src_if)
164 struct radix_node *rn;
167 KASSERT((fibnum < rt_numfibs), ("fib4_check_urpf: bad fibnum"));
168 rh = rt_tables_get_rnh(fibnum, AF_INET);
172 /* Prepare lookup key */
173 struct sockaddr_in sin4;
174 memset(&sin4, 0, sizeof(sin4));
175 sin4.sin_len = sizeof(struct sockaddr_in);
179 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
180 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
181 ret = check_urpf(RNTORT(rn)->rt_nhop, flags, src_if);
191 fib4_lookup_debugnet(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
195 struct radix_node *rn;
196 struct nhop_object *nh;
198 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_debugnet: bad fibnum"));
199 rh = rt_tables_get_rnh(fibnum, AF_INET);
203 /* Prepare lookup key */
204 struct sockaddr_in sin4;
205 memset(&sin4, 0, sizeof(sin4));
206 sin4.sin_family = AF_INET;
207 sin4.sin_len = sizeof(struct sockaddr_in);
211 /* unlocked lookup */
212 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
213 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
214 nh = nhop_select((RNTORT(rn))->rt_nhop, 0);
215 /* Ensure route & ifp is UP */
216 if (RT_LINK_IS_UP(nh->nh_ifp)) {