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_route.h"
35 #include "opt_mpath.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/rmlock.h>
41 #include <sys/malloc.h>
43 #include <sys/socket.h>
44 #include <sys/sysctl.h>
45 #include <sys/kernel.h>
48 #include <net/if_var.h>
49 #include <net/if_dl.h>
50 #include <net/route.h>
51 #include <net/route_var.h>
52 #include <net/route/nhop.h>
53 #include <net/route/shared.h>
57 #include <net/radix_mpath.h>
60 #include <netinet/in.h>
61 #include <netinet/in_var.h>
62 #include <netinet/in_fib.h>
66 /* Verify struct route compatiblity */
67 /* Assert 'struct route_in' is compatible with 'struct route' */
68 CHK_STRUCT_ROUTE_COMPAT(struct route_in, ro_dst4);
69 static void fib4_rte_to_nh_basic(struct nhop_object *nh, struct in_addr dst,
70 uint32_t flags, struct nhop4_basic *pnh4);
71 static void fib4_rte_to_nh_extended(struct nhop_object *nh, struct in_addr dst,
72 uint32_t flags, struct nhop4_extended *pnh4);
74 #define RNTORT(p) ((struct rtentry *)(p))
77 fib4_rte_to_nh_basic(struct nhop_object *nh, struct in_addr dst,
78 uint32_t flags, struct nhop4_basic *pnh4)
81 if ((flags & NHR_IFAIF) != 0)
82 pnh4->nh_ifp = nh->nh_ifa->ifa_ifp;
84 pnh4->nh_ifp = nh->nh_ifp;
85 pnh4->nh_mtu = nh->nh_mtu;
86 if (nh->nh_flags & NHF_GATEWAY)
87 pnh4->nh_addr = nh->gw4_sa.sin_addr;
91 pnh4->nh_flags = nh->nh_flags;
92 /* TODO: Handle RTF_BROADCAST here */
96 fib4_rte_to_nh_extended(struct nhop_object *nh, struct in_addr dst,
97 uint32_t flags, struct nhop4_extended *pnh4)
100 if ((flags & NHR_IFAIF) != 0)
101 pnh4->nh_ifp = nh->nh_ifa->ifa_ifp;
103 pnh4->nh_ifp = nh->nh_ifp;
104 pnh4->nh_mtu = nh->nh_mtu;
105 if (nh->nh_flags & NHF_GATEWAY)
106 pnh4->nh_addr = nh->gw4_sa.sin_addr;
110 pnh4->nh_flags = nh->nh_flags;
111 pnh4->nh_ia = ifatoia(nh->nh_ifa);
112 pnh4->nh_src = IA_SIN(pnh4->nh_ia)->sin_addr;
116 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
117 * Stores nexthop info provided @pnh4 structure.
119 * - nh_ifp cannot be safely dereferenced
120 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
121 * looking up address on interface "ix0" pointer to "lo0" interface
122 * will be returned instead of "ix0")
123 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
124 * - howewer mtu from "transmit" interface will be returned.
127 fib4_lookup_nh_basic(uint32_t fibnum, struct in_addr dst, uint32_t flags,
128 uint32_t flowid, struct nhop4_basic *pnh4)
132 struct radix_node *rn;
133 struct sockaddr_in sin;
134 struct nhop_object *nh;
136 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_basic: bad fibnum"));
137 rh = rt_tables_get_rnh(fibnum, AF_INET);
141 /* Prepare lookup key */
142 memset(&sin, 0, sizeof(sin));
143 sin.sin_len = sizeof(struct sockaddr_in);
147 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
148 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
149 nh = RNTORT(rn)->rt_nhop;
150 /* Ensure route & ifp is UP */
151 if (RT_LINK_IS_UP(nh->nh_ifp)) {
152 fib4_rte_to_nh_basic(nh, dst, flags, pnh4);
164 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
165 * Stores extende nexthop info provided @pnh4 structure.
167 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
168 * - in that case you need to call fib4_free_nh_ext()
169 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
170 * looking up address of interface "ix0" pointer to "lo0" interface
171 * will be returned instead of "ix0")
172 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
173 * - howewer mtu from "transmit" interface will be returned.
176 fib4_lookup_nh_ext(uint32_t fibnum, struct in_addr dst, uint32_t flags,
177 uint32_t flowid, struct nhop4_extended *pnh4)
181 struct radix_node *rn;
182 struct sockaddr_in sin;
184 struct nhop_object *nh;
186 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_ext: bad fibnum"));
187 rh = rt_tables_get_rnh(fibnum, AF_INET);
191 /* Prepare lookup key */
192 memset(&sin, 0, sizeof(sin));
193 sin.sin_len = sizeof(struct sockaddr_in);
197 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
198 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
201 rte = rt_mpath_select(rte, flowid);
208 /* Ensure route & ifp is UP */
209 if (RT_LINK_IS_UP(nh->nh_ifp)) {
210 fib4_rte_to_nh_extended(nh, dst, flags, pnh4);
211 if ((flags & NHR_REF) != 0) {
212 /* TODO: lwref on egress ifp's ? */
225 fib4_free_nh_ext(uint32_t fibnum, struct nhop4_extended *pnh4)
231 * Looks up path in fib @fibnum specified by @dst.
232 * Returns path nexthop on success. Nexthop is safe to use
233 * within the current network epoch. If longer lifetime is required,
234 * one needs to pass NHR_REF as a flag. This will return referenced
238 fib4_lookup(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
239 uint32_t flags, uint32_t flowid)
243 struct radix_node *rn;
245 struct nhop_object *nh;
247 KASSERT((fibnum < rt_numfibs), ("fib4_lookup: bad fibnum"));
248 rh = rt_tables_get_rnh(fibnum, AF_INET);
252 /* Prepare lookup key */
253 struct sockaddr_in sin4;
254 memset(&sin4, 0, sizeof(sin4));
255 sin4.sin_family = AF_INET;
256 sin4.sin_len = sizeof(struct sockaddr_in);
261 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
262 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
265 if (rt_mpath_next(rt) != NULL)
266 rt = rt_mpath_selectrte(rt, flowid);
269 /* Ensure route & ifp is UP */
270 if (RT_LINK_IS_UP(nh->nh_ifp)) {
279 RTSTAT_INC(rts_unreach);
284 check_urpf(const struct nhop_object *nh, uint32_t flags,
285 const struct ifnet *src_if)
288 if (src_if != NULL && nh->nh_aifp == src_if) {
291 if (src_if == NULL) {
292 if ((flags & NHR_NODEFAULT) == 0)
294 else if ((nh->nh_flags & NHF_DEFAULT) == 0)
303 check_urpf_mpath(struct rtentry *rt, uint32_t flags,
304 const struct ifnet *src_if)
308 if (check_urpf(rt->rt_nhop, flags, src_if) != 0)
310 rt = rt_mpath_next(rt);
318 * Performs reverse path forwarding lookup.
319 * If @src_if is non-zero, verifies that at least 1 path goes via
321 * If @src_if is zero, verifies that route exist.
322 * if @flags contains NHR_NOTDEFAULT, do not consider default route.
324 * Returns 1 if route matching conditions is found, 0 otherwise.
327 fib4_check_urpf(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
328 uint32_t flags, const struct ifnet *src_if)
332 struct radix_node *rn;
336 KASSERT((fibnum < rt_numfibs), ("fib4_check_urpf: bad fibnum"));
337 rh = rt_tables_get_rnh(fibnum, AF_INET);
341 /* Prepare lookup key */
342 struct sockaddr_in sin4;
343 memset(&sin4, 0, sizeof(sin4));
344 sin4.sin_len = sizeof(struct sockaddr_in);
348 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
349 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
352 ret = check_urpf_mpath(rt, flags, src_if);
354 ret = check_urpf(rt->rt_nhop, flags, src_if);
365 fib4_lookup_debugnet(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
369 struct radix_node *rn;
371 struct nhop_object *nh;
373 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_debugnet: bad fibnum"));
374 rh = rt_tables_get_rnh(fibnum, AF_INET);
378 /* Prepare lookup key */
379 struct sockaddr_in sin4;
380 memset(&sin4, 0, sizeof(sin4));
381 sin4.sin_family = AF_INET;
382 sin4.sin_len = sizeof(struct sockaddr_in);
386 /* unlocked lookup */
387 rn = rh->rnh_matchaddr((void *)&sin4, &rh->head);
388 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
391 if (rt_mpath_next(rt) != NULL)
392 rt = rt_mpath_selectrte(rt, 0);
395 /* Ensure route & ifp is UP */
396 if (RT_LINK_IS_UP(nh->nh_ifp)) {