FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_fib.c
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("$FreeBSD$");
32
33 #include "opt_inet.h"
34 #include "opt_route.h"
35 #include "opt_mpath.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/lock.h>
40 #include <sys/rmlock.h>
41 #include <sys/malloc.h>
42 #include <sys/mbuf.h>
43 #include <sys/socket.h>
44 #include <sys/sysctl.h>
45 #include <sys/kernel.h>
46
47 #include <net/if.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/vnet.h>
53
54 #ifdef RADIX_MPATH
55 #include <net/radix_mpath.h>
56 #endif
57
58 #include <netinet/in.h>
59 #include <netinet/in_var.h>
60 #include <netinet/in_fib.h>
61
62 #ifdef INET
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);
67
68 #define RNTORT(p) ((struct rtentry *)(p))
69
70 static void
71 fib4_rte_to_nh_basic(struct rtentry *rte, struct in_addr dst,
72 uint32_t flags, struct nhop4_basic *pnh4)
73 {
74 struct sockaddr_in *gw;
75
76 if ((flags & NHR_IFAIF) != 0)
77 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp;
78 else
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;
84 } else
85 pnh4->nh_addr = dst;
86 /* Set flags */
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 */
92 }
93
94 static void
95 fib4_rte_to_nh_extended(struct rtentry *rte, struct in_addr dst,
96 uint32_t flags, struct nhop4_extended *pnh4)
97 {
98 struct sockaddr_in *gw;
99 struct in_ifaddr *ia;
100
101 if ((flags & NHR_IFAIF) != 0)
102 pnh4->nh_ifp = rte->rt_ifa->ifa_ifp;
103 else
104 pnh4->nh_ifp = rte->rt_ifp;
105 pnh4->nh_mtu = min(rte->rt_mtu, rte->rt_ifp->if_mtu);
106 if (rte->rt_flags & RTF_GATEWAY) {
107 gw = (struct sockaddr_in *)rte->rt_gateway;
108 pnh4->nh_addr = gw->sin_addr;
109 } else
110 pnh4->nh_addr = dst;
111 /* Set flags */
112 pnh4->nh_flags = fib_rte_to_nh_flags(rte->rt_flags);
113 gw = (struct sockaddr_in *)rt_key(rte);
114 if (gw->sin_addr.s_addr == 0)
115 pnh4->nh_flags |= NHF_DEFAULT;
116 /* XXX: Set RTF_BROADCAST if GW address is broadcast */
117
118 ia = ifatoia(rte->rt_ifa);
119 pnh4->nh_src = IA_SIN(ia)->sin_addr;
120 }
121
122 /*
123 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
124 * Stores nexthop info provided @pnh4 structure.
125 * Note that
126 * - nh_ifp cannot be safely dereferenced
127 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
128 * looking up address on interface "ix0" pointer to "lo0" interface
129 * will be returned instead of "ix0")
130 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
131 * - howewer mtu from "transmit" interface will be returned.
132 */
133 int
134 fib4_lookup_nh_basic(uint32_t fibnum, struct in_addr dst, uint32_t flags,
135 uint32_t flowid, struct nhop4_basic *pnh4)
136 {
137 RIB_RLOCK_TRACKER;
138 struct rib_head *rh;
139 struct radix_node *rn;
140 struct sockaddr_in sin;
141 struct rtentry *rte;
142
143 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_basic: bad fibnum"));
144 rh = rt_tables_get_rnh(fibnum, AF_INET);
145 if (rh == NULL)
146 return (ENOENT);
147
148 /* Prepare lookup key */
149 memset(&sin, 0, sizeof(sin));
150 sin.sin_len = sizeof(struct sockaddr_in);
151 sin.sin_addr = dst;
152
153 RIB_RLOCK(rh);
154 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
155 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
156 rte = RNTORT(rn);
157 /* Ensure route & ifp is UP */
158 if (RT_LINK_IS_UP(rte->rt_ifp)) {
159 fib4_rte_to_nh_basic(rte, dst, flags, pnh4);
160 RIB_RUNLOCK(rh);
161
162 return (0);
163 }
164 }
165 RIB_RUNLOCK(rh);
166
167 return (ENOENT);
168 }
169
170 /*
171 * Performs IPv4 route table lookup on @dst. Returns 0 on success.
172 * Stores extende nexthop info provided @pnh4 structure.
173 * Note that
174 * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified.
175 * - in that case you need to call fib4_free_nh_ext()
176 * - nh_ifp represents logical transmit interface (rt_ifp) (e.g. if
177 * looking up address of interface "ix0" pointer to "lo0" interface
178 * will be returned instead of "ix0")
179 * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed
180 * - howewer mtu from "transmit" interface will be returned.
181 */
182 int
183 fib4_lookup_nh_ext(uint32_t fibnum, struct in_addr dst, uint32_t flags,
184 uint32_t flowid, struct nhop4_extended *pnh4)
185 {
186 RIB_RLOCK_TRACKER;
187 struct rib_head *rh;
188 struct radix_node *rn;
189 struct sockaddr_in sin;
190 struct rtentry *rte;
191
192 KASSERT((fibnum < rt_numfibs), ("fib4_lookup_nh_ext: bad fibnum"));
193 rh = rt_tables_get_rnh(fibnum, AF_INET);
194 if (rh == NULL)
195 return (ENOENT);
196
197 /* Prepare lookup key */
198 memset(&sin, 0, sizeof(sin));
199 sin.sin_len = sizeof(struct sockaddr_in);
200 sin.sin_addr = dst;
201
202 RIB_RLOCK(rh);
203 rn = rh->rnh_matchaddr((void *)&sin, &rh->head);
204 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
205 rte = RNTORT(rn);
206 #ifdef RADIX_MPATH
207 rte = rt_mpath_select(rte, flowid);
208 if (rte == NULL) {
209 RIB_RUNLOCK(rh);
210 return (ENOENT);
211 }
212 #endif
213 /* Ensure route & ifp is UP */
214 if (RT_LINK_IS_UP(rte->rt_ifp)) {
215 fib4_rte_to_nh_extended(rte, dst, flags, pnh4);
216 if ((flags & NHR_REF) != 0) {
217 /* TODO: lwref on egress ifp's ? */
218 }
219 RIB_RUNLOCK(rh);
220
221 return (0);
222 }
223 }
224 RIB_RUNLOCK(rh);
225
226 return (ENOENT);
227 }
228
229 void
230 fib4_free_nh_ext(uint32_t fibnum, struct nhop4_extended *pnh4)
231 {
232
233 }
234
235 #endif
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