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 * 4. 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/rwlock.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>
55 #include <net/radix_mpath.h>
58 #include <netinet/in.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip_mroute.h>
61 #include <netinet/ip6.h>
62 #include <netinet6/in6_fib.h>
63 #include <netinet6/in6_var.h>
64 #include <netinet6/nd6.h>
65 #include <netinet6/scope6_var.h>
67 #include <net/if_types.h>
70 static void fib6_rte_to_nh_extended(struct rtentry *rte,
71 const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6);
72 static void fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
73 uint32_t flags, struct nhop6_basic *pnh6);
74 static struct ifnet *fib6_get_ifaifp(struct rtentry *rte);
75 #define RNTORT(p) ((struct rtentry *)(p))
78 * Gets real interface for the @rte.
79 * Returns rt_ifp for !IFF_LOOPBACK routers.
80 * Extracts "real" address interface from interface address
84 fib6_get_ifaifp(struct rtentry *rte)
87 struct sockaddr_dl *sdl;
90 if ((ifp->if_flags & IFF_LOOPBACK) &&
91 rte->rt_gateway->sa_family == AF_LINK) {
92 sdl = (struct sockaddr_dl *)rte->rt_gateway;
93 return (ifnet_byindex(sdl->sdl_index));
100 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
101 uint32_t flags, struct nhop6_basic *pnh6)
103 struct sockaddr_in6 *gw;
105 /* Do explicit nexthop zero unless we're copying it */
106 memset(pnh6, 0, sizeof(*pnh6));
108 if ((flags & NHR_IFAIF) != 0)
109 pnh6->nh_ifp = fib6_get_ifaifp(rte);
111 pnh6->nh_ifp = rte->rt_ifp;
113 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
114 if (rte->rt_flags & RTF_GATEWAY) {
115 gw = (struct sockaddr_in6 *)rte->rt_gateway;
116 pnh6->nh_addr = gw->sin6_addr;
117 in6_clearscope(&pnh6->nh_addr);
119 pnh6->nh_addr = *dst;
121 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
122 gw = (struct sockaddr_in6 *)rt_key(rte);
123 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
124 pnh6->nh_flags |= NHF_DEFAULT;
128 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst,
129 uint32_t flags, struct nhop6_extended *pnh6)
131 struct sockaddr_in6 *gw;
133 /* Do explicit nexthop zero unless we're copying it */
134 memset(pnh6, 0, sizeof(*pnh6));
136 if ((flags & NHR_IFAIF) != 0)
137 pnh6->nh_ifp = fib6_get_ifaifp(rte);
139 pnh6->nh_ifp = rte->rt_ifp;
141 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
142 if (rte->rt_flags & RTF_GATEWAY) {
143 gw = (struct sockaddr_in6 *)rte->rt_gateway;
144 pnh6->nh_addr = gw->sin6_addr;
145 in6_clearscope(&pnh6->nh_addr);
147 pnh6->nh_addr = *dst;
149 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
150 gw = (struct sockaddr_in6 *)rt_key(rte);
151 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
152 pnh6->nh_flags |= NHF_DEFAULT;
156 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
157 * Stores basic nexthop info into provided @pnh6 structure.
159 * - nh_ifp represents logical transmit interface (rt_ifp) by default
160 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
161 * - mtu from logical transmit interface will be returned.
162 * - nh_ifp cannot be safely dereferenced
163 * - nh_ifp represents rt_ifp (e.g. if looking up address on
164 * interface "ix0" pointer to "ix0" interface will be returned instead
166 * - howewer mtu from "transmit" interface will be returned.
167 * - scope will be embedded in nh_addr
170 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
171 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
173 struct radix_node_head *rh;
174 struct radix_node *rn;
175 struct sockaddr_in6 sin6;
178 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
179 rh = rt_tables_get_rnh(fibnum, AF_INET6);
183 /* Prepare lookup key */
184 memset(&sin6, 0, sizeof(sin6));
185 sin6.sin6_addr = *dst;
186 sin6.sin6_len = sizeof(struct sockaddr_in6);
187 /* Assume scopeid is valid and embed it directly */
188 if (IN6_IS_SCOPE_LINKLOCAL(dst))
189 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
191 RADIX_NODE_HEAD_RLOCK(rh);
192 rn = rh->rnh_matchaddr((void *)&sin6, rh);
193 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
195 /* Ensure route & ifp is UP */
196 if (RT_LINK_IS_UP(rte->rt_ifp)) {
197 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6);
198 RADIX_NODE_HEAD_RUNLOCK(rh);
202 RADIX_NODE_HEAD_RUNLOCK(rh);
208 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
209 * Stores extended nexthop info into provided @pnh6 structure.
211 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
212 * - in that case you need to call fib6_free_nh_ext()
213 * - nh_ifp represents logical transmit interface (rt_ifp) by default
214 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
215 * - mtu from logical transmit interface will be returned.
216 * - scope will be embedded in nh_addr
219 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
220 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
222 struct radix_node_head *rh;
223 struct radix_node *rn;
224 struct sockaddr_in6 sin6;
227 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
228 rh = rt_tables_get_rnh(fibnum, AF_INET6);
232 /* Prepare lookup key */
233 memset(&sin6, 0, sizeof(sin6));
234 sin6.sin6_len = sizeof(struct sockaddr_in6);
235 sin6.sin6_addr = *dst;
236 /* Assume scopeid is valid and embed it directly */
237 if (IN6_IS_SCOPE_LINKLOCAL(dst))
238 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
240 RADIX_NODE_HEAD_RLOCK(rh);
241 rn = rh->rnh_matchaddr((void *)&sin6, rh);
242 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
244 /* Ensure route & ifp is UP */
245 if (RT_LINK_IS_UP(rte->rt_ifp)) {
246 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags,
248 if ((flags & NHR_REF) != 0) {
249 /* TODO: Do lwref on egress ifp's */
251 RADIX_NODE_HEAD_RUNLOCK(rh);
256 RADIX_NODE_HEAD_RUNLOCK(rh);
262 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)