29#include <sys/time.h>
30#include <sys/socket.h>
31#include <net/if.h>
32#include <net/route.h>
33#include <net/if_dl.h>
34#include <netinet/in.h>
35#include <net/if_types.h>
36#include <netinet/if_ether.h>
37
38#include <fcntl.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sys/errno.h>
43#include <sys/ioctl.h>
44#include <sys/sysctl.h>
45#include <sys/uio.h>
46#include <unistd.h>
47
48#include "command.h"
49#include "mbuf.h"
50#include "log.h"
51#include "id.h"
52#include "route.h"
53#include "arp.h"
54
55#ifdef DEBUG
56/*
57 * To test the proxy arp stuff, put the following in your Makefile:
58 *
59 * arp-test: arp.c
60 * cp ${.CURDIR}/arp.c arp-test.c
61 * echo 'const char *' >>arp-test.c
62 * awk '/^Index2Nam/,/^}/' ${.CURDIR}/route.c >>arp-test.c
63 * cc -I${.CURDIR} -DDEBUG arp-test.c -o arp-test
64 *
65 * and type ``make arp-test''.
66 *
67 */
68#define LogIsKept(x) 0
69#define LogPrintf fprintf
70#undef LogDEBUG
71#define LogDEBUG stderr
72#undef LogERROR
73#define LogERROR stderr
74#undef LogPHASE
75#define LogPHASE stdout
76#define ID0socket socket
77#define ID0ioctl ioctl
78#endif
79
80static int rtm_seq;
81
82static int get_ether_addr(int, struct in_addr, struct sockaddr_dl *);
83
84/*
85 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
86 * if it exists.
87 */
88#define SET_SA_FAMILY(addr, family) \
89 memset((char *) &(addr), '\0', sizeof(addr)); \
90 addr.sa_family = (family); \
91 addr.sa_len = sizeof(addr);
92
93
94#if RTM_VERSION >= 3
95
96/*
97 * sifproxyarp - Make a proxy ARP entry for the peer.
98 */
99static struct {
100 struct rt_msghdr hdr;
101 struct sockaddr_inarp dst;
102 struct sockaddr_dl hwa;
103 char extra[128];
104} arpmsg;
105
106static int arpmsg_valid;
107
108int
109sifproxyarp(int unit, struct in_addr hisaddr)
110{
111 int routes;
112
113 /*
114 * Get the hardware address of an interface on the same subnet as our local
115 * address.
116 */
117 memset(&arpmsg, 0, sizeof arpmsg);
118 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
119 LogPrintf(LogERROR, "Cannot determine ethernet address for proxy ARP\n");
120 return 0;
121 }
122 routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
123 if (routes < 0) {
124 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
125 strerror(errno));
126 return 0;
127 }
128 arpmsg.hdr.rtm_type = RTM_ADD;
129 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
130 arpmsg.hdr.rtm_version = RTM_VERSION;
131 arpmsg.hdr.rtm_seq = ++rtm_seq;
132 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
133 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
134 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
135 arpmsg.dst.sin_family = AF_INET;
136 arpmsg.dst.sin_addr.s_addr = hisaddr.s_addr;
137 arpmsg.dst.sin_other = SIN_PROXY;
138
139 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
140 + arpmsg.hwa.sdl_len;
141 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
142 LogPrintf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
143 close(routes);
144 return 0;
145 }
146 close(routes);
147 arpmsg_valid = 1;
148 return 1;
149}
150
151/*
152 * cifproxyarp - Delete the proxy ARP entry for the peer.
153 */
154int
155cifproxyarp(int unit, struct in_addr hisaddr)
156{
157 int routes;
158
159 if (!arpmsg_valid)
160 return 0;
161 arpmsg_valid = 0;
162
163 arpmsg.hdr.rtm_type = RTM_DELETE;
164 arpmsg.hdr.rtm_seq = ++rtm_seq;
165
166 routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
167 if (routes < 0) {
168 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
169 strerror(errno));
170 return 0;
171 }
172 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
173 LogPrintf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
174 close(routes);
175 return 0;
176 }
177 close(routes);
178 return 1;
179}
180
181#else /* RTM_VERSION */
182
183/*
184 * sifproxyarp - Make a proxy ARP entry for the peer.
185 */
186int
187sifproxyarp(int unit, struct in_addr hisaddr)
188{
189 struct arpreq arpreq;
190 struct {
191 struct sockaddr_dl sdl;
192 char space[128];
193 } dls;
194
195 memset(&arpreq, '\0', sizeof arpreq);
196
197 /*
198 * Get the hardware address of an interface on the same subnet as our local
199 * address.
200 */
201 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
202 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
203 return 0;
204 }
205 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
206 arpreq.arp_ha.sa_family = AF_UNSPEC;
207 memcpy(arpreq.arp_ha.sa_data, LLADDR(&dls.sdl), dls.sdl.sdl_alen);
208 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
209 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr.s_addr;
210 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
211 if (ID0ioctl(unit, SIOCSARP, (caddr_t) & arpreq) < 0) {
212 LogPrintf(LogERROR, "sifproxyarp: ioctl(SIOCSARP): %s\n", strerror(errno));
213 return 0;
214 }
215 return 1;
216}
217
218/*
219 * cifproxyarp - Delete the proxy ARP entry for the peer.
220 */
221int
222cifproxyarp(int unit, struct in_addr hisaddr)
223{
224 struct arpreq arpreq;
225
226 memset(&arpreq, '\0', sizeof arpreq);
227 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
228 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr.s_addr;
229 if (ID0ioctl(unit, SIOCDARP, (caddr_t) & arpreq) < 0) {
230 LogPrintf(LogERROR, "cifproxyarp: ioctl(SIOCDARP): %s\n", strerror(errno));
231 return 0;
232 }
233 return 1;
234}
235
236#endif /* RTM_VERSION */
237
238
239/*
240 * get_ether_addr - get the hardware address of an interface on the
241 * the same subnet as ipaddr.
242 */
243#define MAX_IFS 32
244
245static int
246get_ether_addr(int s, struct in_addr ipaddr, struct sockaddr_dl *hwaddr)
247{
248 int idx;
249 const char *got;
250 char *sp, *ep, *cp, *wp;
251 struct ifreq ifrq;
252 struct in_addr addr, mask;
253 struct rt_msghdr *rtm;
254 struct sockaddr *sa_dst, *sa_gw;
255 struct sockaddr_dl *dl;
256 size_t needed;
257 int mib[6];
258
259 idx = 1;
260 while (strcmp(got = Index2Nam(idx), "???")) {
261 strncpy(ifrq.ifr_name, got, sizeof ifrq.ifr_name - 1);
262 ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
263 if (ID0ioctl(s, SIOCGIFADDR, &ifrq) == 0 &&
264 ifrq.ifr_addr.sa_family == AF_INET) {
265 addr = ((struct sockaddr_in *)&ifrq.ifr_addr)->sin_addr;
266 if (ID0ioctl(s, SIOCGIFNETMASK, &ifrq) == 0) {
267 mask = ((struct sockaddr_in *)&ifrq.ifr_broadaddr)->sin_addr;
268 if ((ipaddr.s_addr & mask.s_addr) == (addr.s_addr & mask.s_addr))
269 break;
270 }
271 }
272 idx++;
273 }
274
275 if (!strcmp(got, "???"))
276 return 0;
277
278 LogPrintf(LogPHASE, "Found interface %s for proxy arp\n", got);
279
280 mib[0] = CTL_NET;
281 mib[1] = PF_ROUTE;
282 mib[2] = 0;
283 mib[3] = 0;
284 mib[4] = NET_RT_DUMP;
285 mib[5] = 0;
286 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
287 LogPrintf(LogERROR, "get_ether_addr: sysctl: estimate: %s\n",
288 strerror(errno));
289 return 0;
290 }
291 if (needed < 0)
292 return 0;
293 if ((sp = malloc(needed)) == NULL)
294 return 0;
295 if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
296 LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
297 free(sp);
298 return (1);
299 }
300 ep = sp + needed;
301
302 for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
303 rtm = (struct rt_msghdr *) cp;
304 if (rtm->rtm_index == idx) {
305 wp = (char *)(rtm+1);
306
307 if (rtm->rtm_addrs & RTA_DST) {
308 sa_dst = (struct sockaddr *)wp;
309 wp += sa_dst->sa_len;
310 } else
311 sa_dst = NULL;
312
313 if (rtm->rtm_addrs & RTA_GATEWAY) {
314 sa_gw = (struct sockaddr *)wp;
315 if (sa_gw->sa_family == AF_LINK) {
316 dl = (struct sockaddr_dl *)wp;
317 if (dl->sdl_alen && dl->sdl_type == IFT_ETHER) {
318 memcpy(hwaddr, dl, dl->sdl_len);
319 free(sp);
320 return 1;
321 }
322 }
323 }
324 }
325 }
326 free(sp);
327 return 0;
328}
329
330#ifdef DEBUG
331int
332main(int argc, char **argv)
333{
334 struct in_addr ipaddr;
335 int s, f;
336
337 s = socket(AF_INET, SOCK_DGRAM, 0);
338 for (f = 1; f < argc; f++) {
339 if (inet_aton(argv[f], &ipaddr))
340 sifproxyarp(s, ipaddr);
341 }
342 close(s);
343}
344#endif
| 29#include <sys/time.h>
30#include <sys/socket.h>
31#include <net/if.h>
32#include <net/route.h>
33#include <net/if_dl.h>
34#include <netinet/in.h>
35#include <net/if_types.h>
36#include <netinet/if_ether.h>
37
38#include <fcntl.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sys/errno.h>
43#include <sys/ioctl.h>
44#include <sys/sysctl.h>
45#include <sys/uio.h>
46#include <unistd.h>
47
48#include "command.h"
49#include "mbuf.h"
50#include "log.h"
51#include "id.h"
52#include "route.h"
53#include "arp.h"
54
55#ifdef DEBUG
56/*
57 * To test the proxy arp stuff, put the following in your Makefile:
58 *
59 * arp-test: arp.c
60 * cp ${.CURDIR}/arp.c arp-test.c
61 * echo 'const char *' >>arp-test.c
62 * awk '/^Index2Nam/,/^}/' ${.CURDIR}/route.c >>arp-test.c
63 * cc -I${.CURDIR} -DDEBUG arp-test.c -o arp-test
64 *
65 * and type ``make arp-test''.
66 *
67 */
68#define LogIsKept(x) 0
69#define LogPrintf fprintf
70#undef LogDEBUG
71#define LogDEBUG stderr
72#undef LogERROR
73#define LogERROR stderr
74#undef LogPHASE
75#define LogPHASE stdout
76#define ID0socket socket
77#define ID0ioctl ioctl
78#endif
79
80static int rtm_seq;
81
82static int get_ether_addr(int, struct in_addr, struct sockaddr_dl *);
83
84/*
85 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
86 * if it exists.
87 */
88#define SET_SA_FAMILY(addr, family) \
89 memset((char *) &(addr), '\0', sizeof(addr)); \
90 addr.sa_family = (family); \
91 addr.sa_len = sizeof(addr);
92
93
94#if RTM_VERSION >= 3
95
96/*
97 * sifproxyarp - Make a proxy ARP entry for the peer.
98 */
99static struct {
100 struct rt_msghdr hdr;
101 struct sockaddr_inarp dst;
102 struct sockaddr_dl hwa;
103 char extra[128];
104} arpmsg;
105
106static int arpmsg_valid;
107
108int
109sifproxyarp(int unit, struct in_addr hisaddr)
110{
111 int routes;
112
113 /*
114 * Get the hardware address of an interface on the same subnet as our local
115 * address.
116 */
117 memset(&arpmsg, 0, sizeof arpmsg);
118 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
119 LogPrintf(LogERROR, "Cannot determine ethernet address for proxy ARP\n");
120 return 0;
121 }
122 routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
123 if (routes < 0) {
124 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
125 strerror(errno));
126 return 0;
127 }
128 arpmsg.hdr.rtm_type = RTM_ADD;
129 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
130 arpmsg.hdr.rtm_version = RTM_VERSION;
131 arpmsg.hdr.rtm_seq = ++rtm_seq;
132 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
133 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
134 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
135 arpmsg.dst.sin_family = AF_INET;
136 arpmsg.dst.sin_addr.s_addr = hisaddr.s_addr;
137 arpmsg.dst.sin_other = SIN_PROXY;
138
139 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
140 + arpmsg.hwa.sdl_len;
141 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
142 LogPrintf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
143 close(routes);
144 return 0;
145 }
146 close(routes);
147 arpmsg_valid = 1;
148 return 1;
149}
150
151/*
152 * cifproxyarp - Delete the proxy ARP entry for the peer.
153 */
154int
155cifproxyarp(int unit, struct in_addr hisaddr)
156{
157 int routes;
158
159 if (!arpmsg_valid)
160 return 0;
161 arpmsg_valid = 0;
162
163 arpmsg.hdr.rtm_type = RTM_DELETE;
164 arpmsg.hdr.rtm_seq = ++rtm_seq;
165
166 routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
167 if (routes < 0) {
168 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
169 strerror(errno));
170 return 0;
171 }
172 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
173 LogPrintf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
174 close(routes);
175 return 0;
176 }
177 close(routes);
178 return 1;
179}
180
181#else /* RTM_VERSION */
182
183/*
184 * sifproxyarp - Make a proxy ARP entry for the peer.
185 */
186int
187sifproxyarp(int unit, struct in_addr hisaddr)
188{
189 struct arpreq arpreq;
190 struct {
191 struct sockaddr_dl sdl;
192 char space[128];
193 } dls;
194
195 memset(&arpreq, '\0', sizeof arpreq);
196
197 /*
198 * Get the hardware address of an interface on the same subnet as our local
199 * address.
200 */
201 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
202 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
203 return 0;
204 }
205 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
206 arpreq.arp_ha.sa_family = AF_UNSPEC;
207 memcpy(arpreq.arp_ha.sa_data, LLADDR(&dls.sdl), dls.sdl.sdl_alen);
208 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
209 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr.s_addr;
210 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
211 if (ID0ioctl(unit, SIOCSARP, (caddr_t) & arpreq) < 0) {
212 LogPrintf(LogERROR, "sifproxyarp: ioctl(SIOCSARP): %s\n", strerror(errno));
213 return 0;
214 }
215 return 1;
216}
217
218/*
219 * cifproxyarp - Delete the proxy ARP entry for the peer.
220 */
221int
222cifproxyarp(int unit, struct in_addr hisaddr)
223{
224 struct arpreq arpreq;
225
226 memset(&arpreq, '\0', sizeof arpreq);
227 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
228 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr.s_addr;
229 if (ID0ioctl(unit, SIOCDARP, (caddr_t) & arpreq) < 0) {
230 LogPrintf(LogERROR, "cifproxyarp: ioctl(SIOCDARP): %s\n", strerror(errno));
231 return 0;
232 }
233 return 1;
234}
235
236#endif /* RTM_VERSION */
237
238
239/*
240 * get_ether_addr - get the hardware address of an interface on the
241 * the same subnet as ipaddr.
242 */
243#define MAX_IFS 32
244
245static int
246get_ether_addr(int s, struct in_addr ipaddr, struct sockaddr_dl *hwaddr)
247{
248 int idx;
249 const char *got;
250 char *sp, *ep, *cp, *wp;
251 struct ifreq ifrq;
252 struct in_addr addr, mask;
253 struct rt_msghdr *rtm;
254 struct sockaddr *sa_dst, *sa_gw;
255 struct sockaddr_dl *dl;
256 size_t needed;
257 int mib[6];
258
259 idx = 1;
260 while (strcmp(got = Index2Nam(idx), "???")) {
261 strncpy(ifrq.ifr_name, got, sizeof ifrq.ifr_name - 1);
262 ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
263 if (ID0ioctl(s, SIOCGIFADDR, &ifrq) == 0 &&
264 ifrq.ifr_addr.sa_family == AF_INET) {
265 addr = ((struct sockaddr_in *)&ifrq.ifr_addr)->sin_addr;
266 if (ID0ioctl(s, SIOCGIFNETMASK, &ifrq) == 0) {
267 mask = ((struct sockaddr_in *)&ifrq.ifr_broadaddr)->sin_addr;
268 if ((ipaddr.s_addr & mask.s_addr) == (addr.s_addr & mask.s_addr))
269 break;
270 }
271 }
272 idx++;
273 }
274
275 if (!strcmp(got, "???"))
276 return 0;
277
278 LogPrintf(LogPHASE, "Found interface %s for proxy arp\n", got);
279
280 mib[0] = CTL_NET;
281 mib[1] = PF_ROUTE;
282 mib[2] = 0;
283 mib[3] = 0;
284 mib[4] = NET_RT_DUMP;
285 mib[5] = 0;
286 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
287 LogPrintf(LogERROR, "get_ether_addr: sysctl: estimate: %s\n",
288 strerror(errno));
289 return 0;
290 }
291 if (needed < 0)
292 return 0;
293 if ((sp = malloc(needed)) == NULL)
294 return 0;
295 if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
296 LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
297 free(sp);
298 return (1);
299 }
300 ep = sp + needed;
301
302 for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
303 rtm = (struct rt_msghdr *) cp;
304 if (rtm->rtm_index == idx) {
305 wp = (char *)(rtm+1);
306
307 if (rtm->rtm_addrs & RTA_DST) {
308 sa_dst = (struct sockaddr *)wp;
309 wp += sa_dst->sa_len;
310 } else
311 sa_dst = NULL;
312
313 if (rtm->rtm_addrs & RTA_GATEWAY) {
314 sa_gw = (struct sockaddr *)wp;
315 if (sa_gw->sa_family == AF_LINK) {
316 dl = (struct sockaddr_dl *)wp;
317 if (dl->sdl_alen && dl->sdl_type == IFT_ETHER) {
318 memcpy(hwaddr, dl, dl->sdl_len);
319 free(sp);
320 return 1;
321 }
322 }
323 }
324 }
325 }
326 free(sp);
327 return 0;
328}
329
330#ifdef DEBUG
331int
332main(int argc, char **argv)
333{
334 struct in_addr ipaddr;
335 int s, f;
336
337 s = socket(AF_INET, SOCK_DGRAM, 0);
338 for (f = 1; f < argc; f++) {
339 if (inet_aton(argv[f], &ipaddr))
340 sifproxyarp(s, ipaddr);
341 }
342 close(s);
343}
344#endif
|