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_var.h>
56 #include <net/radix_mpath.h>
59 #include <netinet/in.h>
60 #include <netinet/in_var.h>
61 #include <netinet/ip_mroute.h>
62 #include <netinet/ip6.h>
63 #include <netinet6/in6_fib.h>
64 #include <netinet6/in6_var.h>
65 #include <netinet6/nd6.h>
66 #include <netinet6/scope6_var.h>
68 #include <net/if_types.h>
71 static void fib6_rte_to_nh_extended(struct rtentry *rte,
72 const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6);
73 static void fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
74 uint32_t flags, struct nhop6_basic *pnh6);
75 static struct ifnet *fib6_get_ifaifp(struct rtentry *rte);
76 #define RNTORT(p) ((struct rtentry *)(p))
78 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
81 * Gets real interface for the @rte.
82 * Returns rt_ifp for !IFF_LOOPBACK routers.
83 * Extracts "real" address interface from interface address
87 fib6_get_ifaifp(struct rtentry *rte)
90 struct sockaddr_dl *sdl;
93 if ((ifp->if_flags & IFF_LOOPBACK) &&
94 rte->rt_gateway->sa_family == AF_LINK) {
95 sdl = (struct sockaddr_dl *)rte->rt_gateway;
96 return (ifnet_byindex(sdl->sdl_index));
103 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
104 uint32_t flags, struct nhop6_basic *pnh6)
106 struct sockaddr_in6 *gw;
108 /* Do explicit nexthop zero unless we're copying it */
109 memset(pnh6, 0, sizeof(*pnh6));
111 if ((flags & NHR_IFAIF) != 0)
112 pnh6->nh_ifp = fib6_get_ifaifp(rte);
114 pnh6->nh_ifp = rte->rt_ifp;
116 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
117 if (rte->rt_flags & RTF_GATEWAY) {
118 gw = (struct sockaddr_in6 *)rte->rt_gateway;
119 pnh6->nh_addr = gw->sin6_addr;
120 in6_clearscope(&pnh6->nh_addr);
122 pnh6->nh_addr = *dst;
124 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
125 gw = (struct sockaddr_in6 *)rt_key(rte);
126 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
127 pnh6->nh_flags |= NHF_DEFAULT;
131 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst,
132 uint32_t flags, struct nhop6_extended *pnh6)
134 struct sockaddr_in6 *gw;
136 /* Do explicit nexthop zero unless we're copying it */
137 memset(pnh6, 0, sizeof(*pnh6));
139 if ((flags & NHR_IFAIF) != 0)
140 pnh6->nh_ifp = fib6_get_ifaifp(rte);
142 pnh6->nh_ifp = rte->rt_ifp;
144 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
145 if (rte->rt_flags & RTF_GATEWAY) {
146 gw = (struct sockaddr_in6 *)rte->rt_gateway;
147 pnh6->nh_addr = gw->sin6_addr;
148 in6_clearscope(&pnh6->nh_addr);
150 pnh6->nh_addr = *dst;
152 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
153 gw = (struct sockaddr_in6 *)rt_key(rte);
154 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
155 pnh6->nh_flags |= NHF_DEFAULT;
159 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
160 * Stores basic nexthop info into provided @pnh6 structure.
162 * - nh_ifp represents logical transmit interface (rt_ifp) by default
163 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
164 * - mtu from logical transmit interface will be returned.
165 * - nh_ifp cannot be safely dereferenced
166 * - nh_ifp represents rt_ifp (e.g. if looking up address on
167 * interface "ix0" pointer to "ix0" interface will be returned instead
169 * - howewer mtu from "transmit" interface will be returned.
170 * - scope will be embedded in nh_addr
173 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
174 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
178 struct radix_node *rn;
179 struct sockaddr_in6 sin6;
182 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
183 rh = rt_tables_get_rnh(fibnum, AF_INET6);
187 /* Prepare lookup key */
188 memset(&sin6, 0, sizeof(sin6));
189 sin6.sin6_addr = *dst;
190 sin6.sin6_len = sizeof(struct sockaddr_in6);
191 /* Assume scopeid is valid and embed it directly */
192 if (IN6_IS_SCOPE_LINKLOCAL(dst))
193 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
196 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
197 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
199 /* Ensure route & ifp is UP */
200 if (RT_LINK_IS_UP(rte->rt_ifp)) {
201 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6);
212 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
213 * Stores extended nexthop info into provided @pnh6 structure.
215 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
216 * - in that case you need to call fib6_free_nh_ext()
217 * - nh_ifp represents logical transmit interface (rt_ifp) by default
218 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
219 * - mtu from logical transmit interface will be returned.
220 * - scope will be embedded in nh_addr
223 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
224 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
228 struct radix_node *rn;
229 struct sockaddr_in6 sin6;
232 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
233 rh = rt_tables_get_rnh(fibnum, AF_INET6);
237 /* Prepare lookup key */
238 memset(&sin6, 0, sizeof(sin6));
239 sin6.sin6_len = sizeof(struct sockaddr_in6);
240 sin6.sin6_addr = *dst;
241 /* Assume scopeid is valid and embed it directly */
242 if (IN6_IS_SCOPE_LINKLOCAL(dst))
243 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
246 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
247 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
250 rte = rt_mpath_select(rte, flowid);
256 /* Ensure route & ifp is UP */
257 if (RT_LINK_IS_UP(rte->rt_ifp)) {
258 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags,
260 if ((flags & NHR_REF) != 0) {
261 /* TODO: Do lwref on egress ifp's */
274 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)