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>
55 #include <net/radix_mpath.h>
58 #include <netinet/in.h>
59 #include <netinet/in_var.h>
60 #include <netinet/in_fib.h>
63 static void fib4_rte_to_nh_basic(struct rtentry *rte, struct in_addr dst,
64 uint32_t flags, struct nhop4_basic *pnh4);
65 static void fib4_rte_to_nh_extended(struct rtentry *rte, struct in_addr dst,
66 uint32_t flags, struct nhop4_extended *pnh4);
68 #define RNTORT(p) ((struct rtentry *)(p))
71 fib4_rte_to_nh_basic(struct rtentry *rte, struct in_addr dst,
72 uint32_t flags, struct nhop4_basic *pnh4)
74 struct sockaddr_in *gw;
76 if ((flags & NHR_IFAIF) != 0)
77 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp;
79 pnh4->nh_ifp = rte->rt_ifp;
80 pnh4->nh_mtu = min(rte->rt_mtu, rte->rt_ifp->if_mtu);
81 if (rte->rt_flags & RTF_GATEWAY) {
82 gw = (struct sockaddr_in *)rte->rt_gateway;
83 pnh4->nh_addr = gw->sin_addr;
87 pnh4->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
88 gw = (struct sockaddr_in *)rt_key(rte);
89 if (gw->sin_addr.s_addr == 0)
90 pnh4->nh_flags |= NHF_DEFAULT;
91 /* TODO: Handle RTF_BROADCAST here */
95 fib4_rte_to_nh_extended(struct rtentry *rte, struct in_addr dst,
96 uint32_t flags, struct nhop4_extended *pnh4)
98 struct sockaddr_in *gw;
100 if ((flags & NHR_IFAIF) != 0)
101 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp;
103 pnh4->nh_ifp = rte->rt_ifp;
104 pnh4->nh_mtu = min(rte->rt_mtu, rte->rt_ifp->if_mtu);
105 if (rte->rt_flags & RTF_GATEWAY) {
106 gw = (struct sockaddr_in *)rte->rt_gateway;
107 pnh4->nh_addr = gw->sin_addr;
111 pnh4->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
112 gw = (struct sockaddr_in *)rt_key(rte);
113 if (gw->sin_addr.s_addr == 0)
114 pnh4->nh_flags |= NHF_DEFAULT;
115 pnh4->nh_ia = ifatoia(rte->rt_ifa);
116 pnh4->nh_src = IA_SIN(pnh4->nh_ia)->sin_addr;
120 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
121 * Stores nexthop info provided @pnh4 structure.
123 * - nh_ifp cannot be safely dereferenced
124 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
125 * looking up address on interface "ix0" pointer to "lo0" interface
126 * will be returned instead of "ix0")
127 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
128 * - howewer mtu from "transmit" interface will be returned.
131 fib4_lookup_nh_basic(uint32_t fibnum, struct in_addr dst, uint32_t flags,
132 uint32_t flowid, struct nhop4_basic *pnh4)
136 struct radix_node *rn;
137 struct sockaddr_in sin;
140 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_basic: bad fibnum"));
141 rh = rt_tables_get_rnh(fibnum, AF_INET);
145 /* Prepare lookup key */
146 memset(&sin, 0, sizeof(sin));
147 sin.sin_len = sizeof(struct sockaddr_in);
151 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
152 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
154 /* Ensure route & ifp is UP */
155 if (RT_LINK_IS_UP(rte->rt_ifp)) {
156 fib4_rte_to_nh_basic(rte, dst, flags, pnh4);
168 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
169 * Stores extende nexthop info provided @pnh4 structure.
171 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
172 * - in that case you need to call fib4_free_nh_ext()
173 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
174 * looking up address of interface "ix0" pointer to "lo0" interface
175 * will be returned instead of "ix0")
176 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
177 * - howewer mtu from "transmit" interface will be returned.
180 fib4_lookup_nh_ext(uint32_t fibnum, struct in_addr dst, uint32_t flags,
181 uint32_t flowid, struct nhop4_extended *pnh4)
185 struct radix_node *rn;
186 struct sockaddr_in sin;
189 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_ext: bad fibnum"));
190 rh = rt_tables_get_rnh(fibnum, AF_INET);
194 /* Prepare lookup key */
195 memset(&sin, 0, sizeof(sin));
196 sin.sin_len = sizeof(struct sockaddr_in);
200 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
201 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
204 rte = rt_mpath_select(rte, flowid);
210 /* Ensure route & ifp is UP */
211 if (RT_LINK_IS_UP(rte->rt_ifp)) {
212 fib4_rte_to_nh_extended(rte, dst, flags, pnh4);
213 if ((flags & NHR_REF) != 0) {
214 /* TODO: lwref on egress ifp's ? */
227 fib4_free_nh_ext(uint32_t fibnum, struct nhop4_extended *pnh4)