1 /*-
2 * Copyright (c) 2015
3 * Alexander V. Chernikov <melifaro@FreeBSD.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/in6_fib.c 335250 2018-06-16 08:26:23Z ae $");
32
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35 #include "opt_route.h"
36 #include "opt_mpath.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/lock.h>
41 #include <sys/rmlock.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/socket.h>
45 #include <sys/sysctl.h>
46 #include <sys/kernel.h>
47
48 #include <net/if.h>
49 #include <net/if_var.h>
50 #include <net/if_dl.h>
51 #include <net/route.h>
52 #include <net/route_var.h>
53 #include <net/vnet.h>
54
55 #ifdef RADIX_MPATH
56 #include <net/radix_mpath.h>
57 #endif
58
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>
67
68 #include <net/if_types.h>
69
70 #ifdef INET6
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))
77
78 /*
79 * Gets real interface for the @rte.
80 * Returns rt_ifp for !IFF_LOOPBACK routers.
81 * Extracts "real" address interface from interface address
82 * loopback routes.
83 */
84 static struct ifnet *
85 fib6_get_ifaifp(struct rtentry *rte)
86 {
87 struct ifnet *ifp;
88 struct sockaddr_dl *sdl;
89
90 ifp = rte->rt_ifp;
91 if ((ifp->if_flags & IFF_LOOPBACK) &&
92 rte->rt_gateway->sa_family == AF_LINK) {
93 sdl = (struct sockaddr_dl *)rte->rt_gateway;
94 return (ifnet_byindex(sdl->sdl_index));
95 }
96
97 return (ifp);
98 }
99
100 static void
101 fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst,
102 uint32_t flags, struct nhop6_basic *pnh6)
103 {
104 struct sockaddr_in6 *gw;
105
106 /* Do explicit nexthop zero unless we're copying it */
107 memset(pnh6, 0, sizeof(*pnh6));
108
109 if ((flags & NHR_IFAIF) != 0)
110 pnh6->nh_ifp = fib6_get_ifaifp(rte);
111 else
112 pnh6->nh_ifp = rte->rt_ifp;
113
114 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
115 if (rte->rt_flags & RTF_GATEWAY) {
116 gw = (struct sockaddr_in6 *)rte->rt_gateway;
117 pnh6->nh_addr = gw->sin6_addr;
118 in6_clearscope(&pnh6->nh_addr);
119 } else
120 pnh6->nh_addr = *dst;
121 /* Set flags */
122 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
123 gw = (struct sockaddr_in6 *)rt_key(rte);
124 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
125 pnh6->nh_flags |= NHF_DEFAULT;
126 }
127
128 static void
129 fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst,
130 uint32_t flags, struct nhop6_extended *pnh6)
131 {
132 struct sockaddr_in6 *gw;
133
134 /* Do explicit nexthop zero unless we're copying it */
135 memset(pnh6, 0, sizeof(*pnh6));
136
137 if ((flags & NHR_IFAIF) != 0)
138 pnh6->nh_ifp = fib6_get_ifaifp(rte);
139 else
140 pnh6->nh_ifp = rte->rt_ifp;
141
142 pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp));
143 if (rte->rt_flags & RTF_GATEWAY) {
144 gw = (struct sockaddr_in6 *)rte->rt_gateway;
145 pnh6->nh_addr = gw->sin6_addr;
146 in6_clearscope(&pnh6->nh_addr);
147 } else
148 pnh6->nh_addr = *dst;
149 /* Set flags */
150 pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
151 gw = (struct sockaddr_in6 *)rt_key(rte);
152 if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr))
153 pnh6->nh_flags |= NHF_DEFAULT;
154 }
155
156 /*
157 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
158 * Stores basic nexthop info into provided @pnh6 structure.
159 * Note that
160 * - nh_ifp represents logical transmit interface (rt_ifp) by default
161 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
162 * - mtu from logical transmit interface will be returned.
163 * - nh_ifp cannot be safely dereferenced
164 * - nh_ifp represents rt_ifp (e.g. if looking up address on
165 * interface "ix0" pointer to "ix0" interface will be returned instead
166 * of "lo0")
167 * - howewer mtu from "transmit" interface will be returned.
168 * - scope will be embedded in nh_addr
169 */
170 int
171 fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid,
172 uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6)
173 {
174 RIB_RLOCK_TRACKER;
175 struct rib_head *rh;
176 struct radix_node *rn;
177 struct sockaddr_in6 sin6;
178 struct rtentry *rte;
179
180 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum"));
181 rh = rt_tables_get_rnh(fibnum, AF_INET6);
182 if (rh == NULL)
183 return (ENOENT);
184
185 /* Prepare lookup key */
186 memset(&sin6, 0, sizeof(sin6));
187 sin6.sin6_addr = *dst;
188 sin6.sin6_len = sizeof(struct sockaddr_in6);
189 /* Assume scopeid is valid and embed it directly */
190 if (IN6_IS_SCOPE_LINKLOCAL(dst))
191 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
192
193 RIB_RLOCK(rh);
194 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
195 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
196 rte = RNTORT(rn);
197 /* Ensure route & ifp is UP */
198 if (RT_LINK_IS_UP(rte->rt_ifp)) {
199 fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6);
200 RIB_RUNLOCK(rh);
201 return (0);
202 }
203 }
204 RIB_RUNLOCK(rh);
205
206 return (ENOENT);
207 }
208
209 /*
210 * Performs IPv6 route table lookup on @dst. Returns 0 on success.
211 * Stores extended nexthop info into provided @pnh6 structure.
212 * Note that
213 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
214 * - in that case you need to call fib6_free_nh_ext()
215 * - nh_ifp represents logical transmit interface (rt_ifp) by default
216 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
217 * - mtu from logical transmit interface will be returned.
218 * - scope will be embedded in nh_addr
219 */
220 int
221 fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid,
222 uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6)
223 {
224 RIB_RLOCK_TRACKER;
225 struct rib_head *rh;
226 struct radix_node *rn;
227 struct sockaddr_in6 sin6;
228 struct rtentry *rte;
229
230 KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum"));
231 rh = rt_tables_get_rnh(fibnum, AF_INET6);
232 if (rh == NULL)
233 return (ENOENT);
234
235 /* Prepare lookup key */
236 memset(&sin6, 0, sizeof(sin6));
237 sin6.sin6_len = sizeof(struct sockaddr_in6);
238 sin6.sin6_addr = *dst;
239 /* Assume scopeid is valid and embed it directly */
240 if (IN6_IS_SCOPE_LINKLOCAL(dst))
241 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
242
243 RIB_RLOCK(rh);
244 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
245 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
246 rte = RNTORT(rn);
247 #ifdef RADIX_MPATH
248 rte = rt_mpath_select(rte, flowid);
249 if (rte == NULL) {
250 RIB_RUNLOCK(rh);
251 return (ENOENT);
252 }
253 #endif
254 /* Ensure route & ifp is UP */
255 if (RT_LINK_IS_UP(rte->rt_ifp)) {
256 fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags,
257 pnh6);
258 if ((flags & NHR_REF) != 0) {
259 /* TODO: Do lwref on egress ifp's */
260 }
261 RIB_RUNLOCK(rh);
262
263 return (0);
264 }
265 }
266 RIB_RUNLOCK(rh);
267
268 return (ENOENT);
269 }
270
271 void
272 fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6)
273 {
274
275 }
276
277 #endif
278
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