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);
77 #define RNTORT(p) ((struct rtentry *)(p))
79 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
81 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
86 fib6_rte_to_nh_basic(const struct nhop_object *nh, const struct in6_addr *dst,
87 uint32_t flags, struct nhop6_basic *pnh6)
90 /* Do explicit nexthop zero unless we're copying it */
91 memset(pnh6, 0, sizeof(*pnh6));
93 if ((flags & NHR_IFAIF) != 0)
94 pnh6->nh_ifp = nh->nh_aifp;
96 pnh6->nh_ifp = nh->nh_ifp;
98 pnh6->nh_mtu = nh->nh_mtu;
99 if (nh->nh_flags & NHF_GATEWAY) {
100 /* Return address with embedded scope. */
101 pnh6->nh_addr = nh->gw6_sa.sin6_addr;
103 pnh6->nh_addr = *dst;
105 pnh6->nh_flags = nh->nh_flags;
109 fib6_rte_to_nh_extended(const struct nhop_object *nh, const struct in6_addr *dst,
110 uint32_t flags, struct nhop6_extended *pnh6)
113 /* Do explicit nexthop zero unless we're copying it */
114 memset(pnh6, 0, sizeof(*pnh6));
116 if ((flags & NHR_IFAIF) != 0)
117 pnh6->nh_ifp = nh->nh_aifp;
119 pnh6->nh_ifp = nh->nh_ifp;
121 pnh6->nh_mtu = nh->nh_mtu;
122 if (nh->nh_flags & NHF_GATEWAY) {
123 /* Return address with embedded scope. */
124 pnh6->nh_addr = nh->gw6_sa.sin6_addr;
126 pnh6->nh_addr = *dst;
128 pnh6->nh_flags = nh->nh_flags;
129 pnh6->nh_ia = ifatoia6(nh->nh_ifa);
133 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
134 * Stores basic nexthop info into provided @pnh6 structure.
136 * - nh_ifp represents logical transmit interface (rt_ifp) by default
137 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
138 * - mtu from logical transmit interface will be returned.
139 * - nh_ifp cannot be safely dereferenced
140 * - nh_ifp represents rt_ifp (e.g. if looking up address on
141 * interface "ix0" pointer to "ix0" interface will be returned instead
143 * - howewer mtu from "transmit" interface will be returned.
144 * - scope will be embedded in nh_addr
147 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
148 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
152 struct radix_node *rn;
153 struct sockaddr_in6 sin6;
154 struct nhop_object *nh;
156 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
157 rh = rt_tables_get_rnh(fibnum, AF_INET6);
161 /* Prepare lookup key */
162 memset(&sin6, 0, sizeof(sin6));
163 sin6.sin6_addr = *dst;
164 sin6.sin6_len = sizeof(struct sockaddr_in6);
165 /* Assume scopeid is valid and embed it directly */
166 if (IN6_IS_SCOPE_LINKLOCAL(dst))
167 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
170 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
171 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
172 nh = RNTORT(rn)->rt_nhop;
173 /* Ensure route & ifp is UP */
174 if (RT_LINK_IS_UP(nh->nh_ifp)) {
175 fib6_rte_to_nh_basic(nh, &sin6.sin6_addr, flags, pnh6);
186 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
187 * Stores extended nexthop info into provided @pnh6 structure.
189 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
190 * - in that case you need to call fib6_free_nh_ext()
191 * - nh_ifp represents logical transmit interface (rt_ifp) by default
192 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
193 * - mtu from logical transmit interface will be returned.
194 * - scope will be embedded in nh_addr
197 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
198 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
202 struct radix_node *rn;
203 struct sockaddr_in6 sin6;
205 struct nhop_object *nh;
207 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
208 rh = rt_tables_get_rnh(fibnum, AF_INET6);
212 /* Prepare lookup key */
213 memset(&sin6, 0, sizeof(sin6));
214 sin6.sin6_len = sizeof(struct sockaddr_in6);
215 sin6.sin6_addr = *dst;
216 /* Assume scopeid is valid and embed it directly */
217 if (IN6_IS_SCOPE_LINKLOCAL(dst))
218 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
221 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
222 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
225 rte = rt_mpath_select(rte, flowid);
232 /* Ensure route & ifp is UP */
233 if (RT_LINK_IS_UP(nh->nh_ifp)) {
234 fib6_rte_to_nh_extended(nh, &sin6.sin6_addr, flags,
236 if ((flags & NHR_REF) != 0) {
237 /* TODO: Do lwref on egress ifp's */
250 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)
256 * Looks up path in fib @fibnum specified by @dst.
257 * Assumes scope is deembedded and provided in @scopeid.
259 * Returns path nexthop on success. Nexthop is safe to use
260 * within the current network epoch. If longer lifetime is required,
261 * one needs to pass NHR_REF as a flag. This will return referenced
265 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6,
266 uint32_t scopeid, uint32_t flags, uint32_t flowid)
270 struct radix_node *rn;
272 struct nhop_object *nh;
273 struct sockaddr_in6 sin6;
275 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
276 rh = rt_tables_get_rnh(fibnum, AF_INET6);
280 /* TODO: radix changes */
282 /* Prepare lookup key */
283 memset(&sin6, 0, sizeof(sin6));
284 sin6.sin6_len = sizeof(struct sockaddr_in6);
285 sin6.sin6_addr = *dst6;
287 /* Assume scopeid is valid and embed it directly */
288 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
289 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
292 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
293 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
296 if (rt_mpath_next(rt) != NULL)
297 rt = rt_mpath_selectrte(rt, flowid);
300 /* Ensure route & ifp is UP */
301 if (RT_LINK_IS_UP(nh->nh_ifp)) {
310 RTSTAT_INC(rts_unreach);
315 check_urpf(const struct nhop_object *nh, uint32_t flags,
316 const struct ifnet *src_if)
319 if (src_if != NULL && nh->nh_aifp == src_if) {
322 if (src_if == NULL) {
323 if ((flags & NHR_NODEFAULT) == 0)
325 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
334 check_urpf_mpath(struct rtentry *rt, uint32_t flags,
335 const struct ifnet *src_if)
339 if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
341 rt = rt_mpath_next(rt);
349 * Performs reverse path forwarding lookup.
350 * If @src_if is non-zero, verifies that at least 1 path goes via
352 * If @src_if is zero, verifies that route exist.
353 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
355 * Returns 1 if route matching conditions is found, 0 otherwise.
358 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
359 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if)
363 struct radix_node *rn;
365 struct sockaddr_in6 sin6;
368 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum"));
369 rh = rt_tables_get_rnh(fibnum, AF_INET6);
373 /* TODO: radix changes */
374 /* Prepare lookup key */
375 memset(&sin6, 0, sizeof(sin6));
376 sin6.sin6_len = sizeof(struct sockaddr_in6);
377 sin6.sin6_addr = *dst6;
379 /* Assume scopeid is valid and embed it directly */
380 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
381 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
384 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
385 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
388 ret = check_urpf_mpath(rt, flags, src_if);
390 ret = check_urpf(rt->rt_nhop, flags, src_if);
401 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6,
402 uint32_t scopeid, uint32_t flags)
405 struct radix_node *rn;
407 struct nhop_object *nh;
408 struct sockaddr_in6 sin6;
410 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
411 rh = rt_tables_get_rnh(fibnum, AF_INET6);
415 /* TODO: radix changes */
417 /* Prepare lookup key */
418 memset(&sin6, 0, sizeof(sin6));
419 sin6.sin6_len = sizeof(struct sockaddr_in6);
420 sin6.sin6_addr = *dst6;
422 /* Assume scopeid is valid and embed it directly */
423 if (IN6_IS_SCOPE_LINKLOCAL(dst6))
424 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
426 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
427 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
430 /* Ensure route & ifp is UP */
431 if (RT_LINK_IS_UP(nh->nh_ifp)) {