FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_rmx.c
1 /*-
2 * Copyright 1994, 1995 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * 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 <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/sysctl.h>
37 #include <sys/socket.h>
38 #include <sys/mbuf.h>
39
40 #include <net/if.h>
41 #include <net/if_var.h>
42 #include <net/route.h>
43 #include <net/route_var.h>
44 #include <net/vnet.h>
45
46 #include <netinet/in.h>
47 #include <netinet/in_var.h>
48 #include <netinet/ip.h>
49 #include <netinet/ip_icmp.h>
50 #include <netinet/ip_var.h>
51
52 extern int in_inithead(void **head, int off);
53 #ifdef VIMAGE
54 extern int in_detachhead(void **head, int off);
55 #endif
56
57 /*
58 * Do what we need to do when inserting a route.
59 */
60 static struct radix_node *
61 in_addroute(void *v_arg, void *n_arg, struct radix_head *head,
62 struct radix_node *treenodes)
63 {
64 struct rtentry *rt = (struct rtentry *)treenodes;
65 struct sockaddr_in *sin = (struct sockaddr_in *)rt_key(rt);
66
67 /*
68 * A little bit of help for both IP output and input:
69 * For host routes, we make sure that RTF_BROADCAST
70 * is set for anything that looks like a broadcast address.
71 * This way, we can avoid an expensive call to in_broadcast()
72 * in ip_output() most of the time (because the route passed
73 * to ip_output() is almost always a host route).
74 *
75 * We also do the same for local addresses, with the thought
76 * that this might one day be used to speed up ip_input().
77 *
78 * We also mark routes to multicast addresses as such, because
79 * it's easy to do and might be useful (but this is much more
80 * dubious since it's so easy to inspect the address).
81 */
82 if (rt->rt_flags & RTF_HOST) {
83 if (in_broadcast(sin->sin_addr, rt->rt_ifp)) {
84 rt->rt_flags |= RTF_BROADCAST;
85 } else if (satosin(rt->rt_ifa->ifa_addr)->sin_addr.s_addr ==
86 sin->sin_addr.s_addr) {
87 rt->rt_flags |= RTF_LOCAL;
88 }
89 }
90 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
91 rt->rt_flags |= RTF_MULTICAST;
92
93 if (rt->rt_ifp != NULL) {
94
95 /*
96 * Check route MTU:
97 * inherit interface MTU if not set or
98 * check if MTU is too large.
99 */
100 if (rt->rt_mtu == 0) {
101 rt->rt_mtu = rt->rt_ifp->if_mtu;
102 } else if (rt->rt_mtu > rt->rt_ifp->if_mtu)
103 rt->rt_mtu = rt->rt_ifp->if_mtu;
104 }
105
106 return (rn_addroute(v_arg, n_arg, head, treenodes));
107 }
108
109 static int _in_rt_was_here;
110 /*
111 * Initialize our routing tree.
112 */
113 int
114 in_inithead(void **head, int off)
115 {
116 struct rib_head *rh;
117
118 rh = rt_table_init(32);
119 if (rh == NULL)
120 return (0);
121
122 rh->rnh_addaddr = in_addroute;
123 *head = (void *)rh;
124
125 if (_in_rt_was_here == 0 ) {
126 _in_rt_was_here = 1;
127 }
128 return 1;
129 }
130
131 #ifdef VIMAGE
132 int
133 in_detachhead(void **head, int off)
134 {
135
136 rt_table_destroy((struct rib_head *)(*head));
137 return (1);
138 }
139 #endif
140
141 /*
142 * This zaps old routes when the interface goes down or interface
143 * address is deleted. In the latter case, it deletes static routes
144 * that point to this address. If we don't do this, we may end up
145 * using the old address in the future. The ones we always want to
146 * get rid of are things like ARP entries, since the user might down
147 * the interface, walk over to a completely different network, and
148 * plug back in.
149 */
150 struct in_ifadown_arg {
151 struct ifaddr *ifa;
152 int del;
153 };
154
155 static int
156 in_ifadownkill(const struct rtentry *rt, void *xap)
157 {
158 struct in_ifadown_arg *ap = xap;
159
160 if (rt->rt_ifa != ap->ifa)
161 return (0);
162
163 if ((rt->rt_flags & RTF_STATIC) != 0 && ap->del == 0)
164 return (0);
165
166 return (1);
167 }
168
169 void
170 in_ifadown(struct ifaddr *ifa, int delete)
171 {
172 struct in_ifadown_arg arg;
173
174 KASSERT(ifa->ifa_addr->sa_family == AF_INET,
175 ("%s: wrong family", __func__));
176
177 arg.ifa = ifa;
178 arg.del = delete;
179
180 rt_foreach_fib_walk_del(AF_INET, in_ifadownkill, &arg);
181 ifa->ifa_flags &= ~IFA_ROUTE; /* XXXlocking? */
182 }
183
184 /*
185 * inet versions of rt functions. These have fib extensions and
186 * for now will just reference the _fib variants.
187 * eventually this order will be reversed,
188 */
189 void
190 in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum)
191 {
192 rtalloc_ign_fib(ro, ignflags, fibnum);
193 }
194
195 void
196 in_rtredirect(struct sockaddr *dst,
197 struct sockaddr *gateway,
198 struct sockaddr *netmask,
199 int flags,
200 struct sockaddr *src,
201 u_int fibnum)
202 {
203 rtredirect_fib(dst, gateway, netmask, flags, src, fibnum);
204 }
205
Cache object: 2142526a991c46c94d1cca63cd7185ae
|