2 * Copyright (c) 1984, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Geoffrey M. Rehmet, All rights reserved.
7 * This code is derived from software which forms part of the 4.4-Lite
8 * Berkeley software distribution, which was in derived from software
9 * contributed to Berkeley by Sun Microsystems, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * from arp.c 8.2 (Berkeley) 1/2/94
45 #include <sys/param.h>
47 * Verify that we are at least 4.4 BSD
52 #include <sys/socket.h>
53 #include <sys/filio.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/route.h>
61 #include <netinet/in.h>
62 #include <netinet/if_ether.h>
64 #include <arpa/inet.h>
75 static int rtmsg __P((int));
77 static int s = -1; /* routing socket */
81 * Open the routing socket
83 static void getsocket () {
85 s = socket(PF_ROUTE, SOCK_RAW, 0);
87 report(LOG_ERR, "socket %s", strerror(errno));
92 * Drain the socket of any unwanted routing messages.
97 ioctl(s, FIONREAD, &n);
99 read(s, buf, sizeof buf);
100 ioctl(s, FIONREAD, &n);
105 static struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
106 static struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
107 static struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
108 static int expire_time, flags, export_only, doing_proxy;
110 struct rt_msghdr m_rtm;
115 * Set an individual arp entry
117 int bsd_arp_set(ia, eaddr, len)
122 register struct sockaddr_inarp *sin = &sin_m;
123 register struct sockaddr_dl *sdl;
124 register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
134 ea = (u_char *)LLADDR(&sdl_m);
135 bcopy(eaddr, ea, len);
136 sdl_m.sdl_alen = len;
137 doing_proxy = flags = export_only = expire_time = 0;
139 /* make arp entry temporary */
140 gettimeofday(&time, 0);
141 expire_time = time.tv_sec + 20 * 60;
144 if (rtmsg(RTM_GET) < 0) {
145 report(LOG_WARNING, "rtmget: %s", strerror(errno));
148 sin = (struct sockaddr_inarp *)(rtm + 1);
149 sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
150 if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
151 if (sdl->sdl_family == AF_LINK &&
152 (rtm->rtm_flags & RTF_LLINFO) &&
153 !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
154 case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
155 case IFT_ISO88024: case IFT_ISO88025:
159 if (doing_proxy == 0) {
160 report(LOG_WARNING, "set: can only proxy for %s\n",
161 inet_ntoa(sin->sin_addr));
164 if (sin_m.sin_other & SIN_PROXY) {
166 "set: proxy entry exists for non 802 device\n");
169 sin_m.sin_other = SIN_PROXY;
174 if (sdl->sdl_family != AF_LINK) {
176 "cannot intuit interface index and type for %s\n",
177 inet_ntoa(sin->sin_addr));
180 sdl_m.sdl_type = sdl->sdl_type;
181 sdl_m.sdl_index = sdl->sdl_index;
186 static int rtmsg(cmd)
191 register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
192 register char *cp = m_rtmsg.m_space;
196 bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
197 rtm->rtm_flags = flags;
198 rtm->rtm_version = RTM_VERSION;
202 report(LOG_ERR, "set_arp: internal wrong cmd - exiting");
206 rtm->rtm_addrs |= RTA_GATEWAY;
207 rtm->rtm_rmx.rmx_expire = expire_time;
208 rtm->rtm_inits = RTV_EXPIRE;
209 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
213 sin_m.sin_other = SIN_PROXY;
215 rtm->rtm_addrs |= RTA_NETMASK;
216 rtm->rtm_flags &= ~RTF_HOST;
221 rtm->rtm_addrs |= RTA_DST;
223 #define NEXTADDR(w, s) \
224 if (rtm->rtm_addrs & (w)) { \
225 bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
227 NEXTADDR(RTA_DST, sin_m);
228 NEXTADDR(RTA_GATEWAY, sdl_m);
229 NEXTADDR(RTA_NETMASK, so_mask);
231 rtm->rtm_msglen = cp - (char *)&m_rtmsg;
234 rtm->rtm_seq = ++seq;
236 if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
237 if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){
238 report(LOG_WARNING, "writing to routing socket: %s",
244 l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
245 } while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
247 report(LOG_WARNING, "arp: read from routing socket: %s\n",
253 #endif /* BSD >= 199306 */