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.
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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.
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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
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41 * from arp.c 8.2 (Berkeley) 1/2/94
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
47 #include <sys/param.h>
49 * Verify that we are at least 4.4 BSD
54 #include <sys/socket.h>
55 #include <sys/filio.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/route.h>
63 #include <netinet/in.h>
64 #include <netinet/if_ether.h>
66 #include <arpa/inet.h>
78 static int rtmsg(int);
80 static int s = -1; /* routing socket */
84 * Open the routing socket
86 static void getsocket () {
88 s = socket(PF_ROUTE, SOCK_RAW, 0);
90 report(LOG_ERR, "socket %s", strerror(errno));
95 * Drain the socket of any unwanted routing messages.
100 ioctl(s, FIONREAD, &n);
102 read(s, buf, sizeof buf);
103 ioctl(s, FIONREAD, &n);
108 static struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
109 static struct sockaddr_in blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
110 static struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
111 static int expire_time, flags, doing_proxy;
113 struct rt_msghdr m_rtm;
118 * Set an individual arp entry
120 int bsd_arp_set(ia, eaddr, len)
125 register struct sockaddr_in *sin = &sin_m;
126 register struct sockaddr_dl *sdl;
127 register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
137 ea = (u_char *)LLADDR(&sdl_m);
138 bcopy(eaddr, ea, len);
139 sdl_m.sdl_alen = len;
140 doing_proxy = flags = expire_time = 0;
142 /* make arp entry temporary */
143 clock_gettime(CLOCK_MONOTONIC, &tp);
144 expire_time = tp.tv_sec + 20 * 60;
147 if (rtmsg(RTM_GET) < 0) {
148 report(LOG_WARNING, "rtmget: %s", strerror(errno));
151 sin = (struct sockaddr_in *)(rtm + 1);
152 sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
153 if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
154 if (sdl->sdl_family == AF_LINK &&
155 !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
156 case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
157 case IFT_ISO88024: case IFT_ISO88025:
161 if (doing_proxy == 0) {
162 report(LOG_WARNING, "set: can only proxy for %s\n",
163 inet_ntoa(sin->sin_addr));
169 if (sdl->sdl_family != AF_LINK) {
171 "cannot intuit interface index and type for %s\n",
172 inet_ntoa(sin->sin_addr));
175 sdl_m.sdl_type = sdl->sdl_type;
176 sdl_m.sdl_index = sdl->sdl_index;
181 static int rtmsg(cmd)
186 register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
187 register char *cp = m_rtmsg.m_space;
191 bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
192 rtm->rtm_flags = flags;
193 rtm->rtm_version = RTM_VERSION;
197 report(LOG_ERR, "set_arp: internal wrong cmd - exiting");
201 rtm->rtm_addrs |= RTA_GATEWAY;
202 rtm->rtm_rmx.rmx_expire = expire_time;
203 rtm->rtm_inits = RTV_EXPIRE;
204 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
206 rtm->rtm_addrs |= RTA_NETMASK;
207 rtm->rtm_flags &= ~RTF_HOST;
211 rtm->rtm_addrs |= RTA_DST;
213 #define NEXTADDR(w, s) \
214 if (rtm->rtm_addrs & (w)) { \
215 bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
217 NEXTADDR(RTA_DST, sin_m);
218 NEXTADDR(RTA_GATEWAY, sdl_m);
219 NEXTADDR(RTA_NETMASK, so_mask);
221 rtm->rtm_msglen = cp - (char *)&m_rtmsg;
224 rtm->rtm_seq = ++seq;
226 if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
227 if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){
228 report(LOG_WARNING, "writing to routing socket: %s",
234 l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
235 } while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
237 report(LOG_WARNING, "arp: read from routing socket: %s\n",
243 #endif /* BSD >= 199306 */