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 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
80 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
83 * Gets real interface for the @rte.
84 * Returns rt_ifp for !IFF_LOOPBACK routers.
85 * Extracts "real" address interface from interface address
89 fib6_get_ifaifp(struct rtentry *rte)
92 struct sockaddr_dl *sdl;
95 if ((ifp->if_flags & IFF_LOOPBACK) &&
96 rte->rt_gateway->sa_family == AF_LINK) {
97 sdl = (struct sockaddr_dl *)rte->rt_gateway;
98 return (ifnet_byindex(sdl->sdl_index));
105 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
106 uint32_t flags, struct nhop6_basic *pnh6)
108 struct sockaddr_in6 *gw;
110 /* Do explicit nexthop zero unless we're copying it */
111 memset(pnh6, 0, sizeof(*pnh6));
113 if ((flags & NHR_IFAIF) != 0)
114 pnh6->nh_ifp = fib6_get_ifaifp(rte);
116 pnh6->nh_ifp = rte->rt_ifp;
118 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
119 if (rte->rt_flags & RTF_GATEWAY) {
120 /* Return address with embedded scope. */
121 gw = (struct sockaddr_in6 *)rte->rt_gateway;
122 pnh6->nh_addr = gw->sin6_addr;
124 pnh6->nh_addr = *dst;
126 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
127 gw = (struct sockaddr_in6 *)rt_key(rte);
128 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
129 pnh6->nh_flags |= NHF_DEFAULT;
133 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst,
134 uint32_t flags, struct nhop6_extended *pnh6)
136 struct sockaddr_in6 *gw;
138 /* Do explicit nexthop zero unless we're copying it */
139 memset(pnh6, 0, sizeof(*pnh6));
141 if ((flags & NHR_IFAIF) != 0)
142 pnh6->nh_ifp = fib6_get_ifaifp(rte);
144 pnh6->nh_ifp = rte->rt_ifp;
146 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
147 if (rte->rt_flags & RTF_GATEWAY) {
148 /* Return address with embedded scope. */
149 gw = (struct sockaddr_in6 *)rte->rt_gateway;
150 pnh6->nh_addr = gw->sin6_addr;
152 pnh6->nh_addr = *dst;
154 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
155 gw = (struct sockaddr_in6 *)rt_key(rte);
156 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
157 pnh6->nh_flags |= NHF_DEFAULT;
158 pnh6->nh_ia = ifatoia6(rte->rt_ifa);
162 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
163 * Stores basic nexthop info into provided @pnh6 structure.
165 * - nh_ifp represents logical transmit interface (rt_ifp) by default
166 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
167 * - mtu from logical transmit interface will be returned.
168 * - nh_ifp cannot be safely dereferenced
169 * - nh_ifp represents rt_ifp (e.g. if looking up address on
170 * interface "ix0" pointer to "ix0" interface will be returned instead
172 * - howewer mtu from "transmit" interface will be returned.
173 * - scope will be embedded in nh_addr
176 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
177 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
181 struct radix_node *rn;
182 struct sockaddr_in6 sin6;
185 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
186 rh = rt_tables_get_rnh(fibnum, AF_INET6);
190 /* Prepare lookup key */
191 memset(&sin6, 0, sizeof(sin6));
192 sin6.sin6_addr = *dst;
193 sin6.sin6_len = sizeof(struct sockaddr_in6);
194 /* Assume scopeid is valid and embed it directly */
195 if (IN6_IS_SCOPE_LINKLOCAL(dst))
196 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
199 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
200 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
202 /* Ensure route & ifp is UP */
203 if (RT_LINK_IS_UP(rte->rt_ifp)) {
204 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6);
215 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
216 * Stores extended nexthop info into provided @pnh6 structure.
218 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
219 * - in that case you need to call fib6_free_nh_ext()
220 * - nh_ifp represents logical transmit interface (rt_ifp) by default
221 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
222 * - mtu from logical transmit interface will be returned.
223 * - scope will be embedded in nh_addr
226 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
227 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
231 struct radix_node *rn;
232 struct sockaddr_in6 sin6;
235 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
236 rh = rt_tables_get_rnh(fibnum, AF_INET6);
240 /* Prepare lookup key */
241 memset(&sin6, 0, sizeof(sin6));
242 sin6.sin6_len = sizeof(struct sockaddr_in6);
243 sin6.sin6_addr = *dst;
244 /* Assume scopeid is valid and embed it directly */
245 if (IN6_IS_SCOPE_LINKLOCAL(dst))
246 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
249 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
250 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
253 rte = rt_mpath_select(rte, flowid);
259 /* Ensure route & ifp is UP */
260 if (RT_LINK_IS_UP(rte->rt_ifp)) {
261 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags,
263 if ((flags & NHR_REF) != 0) {
264 /* TODO: Do lwref on egress ifp's */
277 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)