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>
54 #include <net/route/shared.h>
58 #include <net/radix_mpath.h>
61 #include <netinet/in.h>
62 #include <netinet/in_var.h>
63 #include <netinet/ip_mroute.h>
64 #include <netinet/ip6.h>
65 #include <netinet6/in6_fib.h>
66 #include <netinet6/in6_var.h>
67 #include <netinet6/nd6.h>
68 #include <netinet6/scope6_var.h>
70 #include <net/if_types.h>
73 static void fib6_rte_to_nh_extended(const struct nhop_object *nh,
74 const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6);
75 static void fib6_rte_to_nh_basic(const struct nhop_object *nh, const struct in6_addr *dst,
76 uint32_t flags, struct nhop6_basic *pnh6);
78 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
80 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
85 fib6_rte_to_nh_basic(const struct nhop_object *nh, const struct in6_addr *dst,
86 uint32_t flags, struct nhop6_basic *pnh6)
89 /* Do explicit nexthop zero unless we're copying it */
90 memset(pnh6, 0, sizeof(*pnh6));
92 if ((flags & NHR_IFAIF) != 0)
93 pnh6->nh_ifp = nh->nh_aifp;
95 pnh6->nh_ifp = nh->nh_ifp;
97 pnh6->nh_mtu = nh->nh_mtu;
98 if (nh->nh_flags & NHF_GATEWAY) {
99 /* Return address with embedded scope. */
100 pnh6->nh_addr = nh->gw6_sa.sin6_addr;
102 pnh6->nh_addr = *dst;
104 pnh6->nh_flags = nh->nh_flags;
108 fib6_rte_to_nh_extended(const struct nhop_object *nh, const struct in6_addr *dst,
109 uint32_t flags, struct nhop6_extended *pnh6)
112 /* Do explicit nexthop zero unless we're copying it */
113 memset(pnh6, 0, sizeof(*pnh6));
115 if ((flags & NHR_IFAIF) != 0)
116 pnh6->nh_ifp = nh->nh_aifp;
118 pnh6->nh_ifp = nh->nh_ifp;
120 pnh6->nh_mtu = nh->nh_mtu;
121 if (nh->nh_flags & NHF_GATEWAY) {
122 /* Return address with embedded scope. */
123 pnh6->nh_addr = nh->gw6_sa.sin6_addr;
125 pnh6->nh_addr = *dst;
127 pnh6->nh_flags = nh->nh_flags;
128 pnh6->nh_ia = ifatoia6(nh->nh_ifa);
132 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
133 * Stores basic nexthop info into provided @pnh6 structure.
135 * - nh_ifp represents logical transmit interface (rt_ifp) by default
136 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
137 * - mtu from logical transmit interface will be returned.
138 * - nh_ifp cannot be safely dereferenced
139 * - nh_ifp represents rt_ifp (e.g. if looking up address on
140 * interface "ix0" pointer to "ix0" interface will be returned instead
142 * - howewer mtu from "transmit" interface will be returned.
143 * - scope will be embedded in nh_addr
146 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
147 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
151 struct radix_node *rn;
152 struct sockaddr_in6 sin6;
153 struct nhop_object *nh;
155 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
156 rh = rt_tables_get_rnh(fibnum, AF_INET6);
160 /* Prepare lookup key */
161 memset(&sin6, 0, sizeof(sin6));
162 sin6.sin6_addr = *dst;
163 sin6.sin6_len = sizeof(struct sockaddr_in6);
164 /* Assume scopeid is valid and embed it directly */
165 if (IN6_IS_SCOPE_LINKLOCAL(dst))
166 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
169 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
170 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
171 nh = RNTORT(rn)->rt_nhop;
172 /* Ensure route & ifp is UP */
173 if (RT_LINK_IS_UP(nh->nh_ifp)) {
174 fib6_rte_to_nh_basic(nh, &sin6.sin6_addr, flags, pnh6);
185 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
186 * Stores extended nexthop info into provided @pnh6 structure.
188 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
189 * - in that case you need to call fib6_free_nh_ext()
190 * - nh_ifp represents logical transmit interface (rt_ifp) by default
191 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
192 * - mtu from logical transmit interface will be returned.
193 * - scope will be embedded in nh_addr
196 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
197 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
201 struct radix_node *rn;
202 struct sockaddr_in6 sin6;
204 struct nhop_object *nh;
206 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
207 rh = rt_tables_get_rnh(fibnum, AF_INET6);
211 /* Prepare lookup key */
212 memset(&sin6, 0, sizeof(sin6));
213 sin6.sin6_len = sizeof(struct sockaddr_in6);
214 sin6.sin6_addr = *dst;
215 /* Assume scopeid is valid and embed it directly */
216 if (IN6_IS_SCOPE_LINKLOCAL(dst))
217 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
220 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
221 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
224 rte = rt_mpath_select(rte, flowid);
231 /* Ensure route & ifp is UP */
232 if (RT_LINK_IS_UP(nh->nh_ifp)) {
233 fib6_rte_to_nh_extended(nh, &sin6.sin6_addr, flags,
235 if ((flags & NHR_REF) != 0) {
236 /* TODO: Do lwref on egress ifp's */
249 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)
255 * Looks up path in fib @fibnum specified by @dst.
256 * Assumes scope is deembedded and provided in @scopeid.
258 * Returns path nexthop on success. Nexthop is safe to use
259 * within the current network epoch. If longer lifetime is required,
260 * one needs to pass NHR_REF as a flag. This will return referenced
264 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6,
265 uint32_t scopeid, uint32_t flags, uint32_t flowid)
269 struct radix_node *rn;
271 struct nhop_object *nh;
272 struct sockaddr_in6 sin6;
274 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
275 rh = rt_tables_get_rnh(fibnum, AF_INET6);
279 /* TODO: radix changes */
281 /* Prepare lookup key */
282 memset(&sin6, 0, sizeof(sin6));
283 sin6.sin6_len = sizeof(struct sockaddr_in6);
284 sin6.sin6_addr = *dst6;
286 /* Assume scopeid is valid and embed it directly */
287 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
288 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
291 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
292 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
295 if (rt_mpath_next(rt) != NULL)
296 rt = rt_mpath_selectrte(rt, flowid);
299 /* Ensure route & ifp is UP */
300 if (RT_LINK_IS_UP(nh->nh_ifp)) {
309 RTSTAT_INC(rts_unreach);
314 check_urpf(const struct nhop_object *nh, uint32_t flags,
315 const struct ifnet *src_if)
318 if (src_if != NULL && nh->nh_aifp == src_if) {
321 if (src_if == NULL) {
322 if ((flags & NHR_NODEFAULT) == 0)
324 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
333 check_urpf_mpath(struct rtentry *rt, uint32_t flags,
334 const struct ifnet *src_if)
338 if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
340 rt = rt_mpath_next(rt);
348 * Performs reverse path forwarding lookup.
349 * If @src_if is non-zero, verifies that at least 1 path goes via
351 * If @src_if is zero, verifies that route exist.
352 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
354 * Returns 1 if route matching conditions is found, 0 otherwise.
357 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
358 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if)
362 struct radix_node *rn;
364 struct sockaddr_in6 sin6;
367 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum"));
368 rh = rt_tables_get_rnh(fibnum, AF_INET6);
372 /* TODO: radix changes */
373 /* Prepare lookup key */
374 memset(&sin6, 0, sizeof(sin6));
375 sin6.sin6_len = sizeof(struct sockaddr_in6);
376 sin6.sin6_addr = *dst6;
378 /* Assume scopeid is valid and embed it directly */
379 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
380 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
383 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
384 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
387 ret = check_urpf_mpath(rt, flags, src_if);
389 ret = check_urpf(rt->rt_nhop, flags, src_if);
400 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6,
401 uint32_t scopeid, uint32_t flags)
404 struct radix_node *rn;
406 struct nhop_object *nh;
407 struct sockaddr_in6 sin6;
409 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
410 rh = rt_tables_get_rnh(fibnum, AF_INET6);
414 /* TODO: radix changes */
416 /* Prepare lookup key */
417 memset(&sin6, 0, sizeof(sin6));
418 sin6.sin6_len = sizeof(struct sockaddr_in6);
419 sin6.sin6_addr = *dst6;
421 /* Assume scopeid is valid and embed it directly */
422 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
423 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
425 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
426 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
429 /* Ensure route & ifp is UP */
430 if (RT_LINK_IS_UP(nh->nh_ifp)) {