39#include <net/route.h>
40#include <net/if_dl.h>
41#include <netinet/in.h>
42#include <stdio.h>
43#include <fcntl.h>
44#ifdef __bsdi__
45#include <kvm.h>
46#endif
47#include <net/if_types.h>
48#include <netinet/in_var.h>
49#include <netinet/if_ether.h>
50#include "log.h"
51
52#if RTM_VERSION >= 3
53#include <netinet/if_ether.h>
54#endif
55
56static int rtm_seq;
57
58static int get_ether_addr __P((int, u_long, struct sockaddr_dl *));
59
60#define BCOPY(s, d, l) memcpy(d, s, l)
61#define BZERO(s, n) memset(s, 0, n)
62/*
63 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
64 * if it exists.
65 */
66#define SET_SA_FAMILY(addr, family) \
67 BZERO((char *) &(addr), sizeof(addr)); \
68 addr.sa_family = (family); \
69 addr.sa_len = sizeof(addr);
70
71
72#if RTM_VERSION >= 3
73
74/*
75 * sifproxyarp - Make a proxy ARP entry for the peer.
76 */
77static struct {
78 struct rt_msghdr hdr;
79 struct sockaddr_inarp dst;
80 struct sockaddr_dl hwa;
81 char extra[128];
82} arpmsg;
83
84static int arpmsg_valid;
85
86int
87sifproxyarp(unit, hisaddr)
88 int unit;
89 u_long hisaddr;
90{
91 int routes;
92
93 /*
94 * Get the hardware address of an interface on the same subnet
95 * as our local address.
96 */
97 memset(&arpmsg, 0, sizeof(arpmsg));
98 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
99 logprintf("Cannot determine ethernet address for proxy ARP\n");
100 return 0;
101 }
102
103 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
104 logprintf("sifproxyarp: opening routing socket: \n");
105 return 0;
106 }
107
108 arpmsg.hdr.rtm_type = RTM_ADD;
109 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
110 arpmsg.hdr.rtm_version = RTM_VERSION;
111 arpmsg.hdr.rtm_seq = ++rtm_seq;
112 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
113 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
114 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
115 arpmsg.dst.sin_family = AF_INET;
116 arpmsg.dst.sin_addr.s_addr = hisaddr;
117 arpmsg.dst.sin_other = SIN_PROXY;
118
119 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
120 + arpmsg.hwa.sdl_len;
121 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
122 logprintf("add proxy arp entry: \n");
123 close(routes);
124 return 0;
125 }
126
127 close(routes);
128 arpmsg_valid = 1;
129 return 1;
130}
131
132/*
133 * cifproxyarp - Delete the proxy ARP entry for the peer.
134 */
135int
136cifproxyarp(unit, hisaddr)
137 int unit;
138 u_long hisaddr;
139{
140 int routes;
141
142 if (!arpmsg_valid)
143 return 0;
144 arpmsg_valid = 0;
145
146 arpmsg.hdr.rtm_type = RTM_DELETE;
147 arpmsg.hdr.rtm_seq = ++rtm_seq;
148
149 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
150 logprintf("sifproxyarp: opening routing socket: \n");
151 return 0;
152 }
153
154 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
155 logprintf("delete proxy arp entry: \n");
156 close(routes);
157 return 0;
158 }
159
160 close(routes);
161 return 1;
162}
163
164#else /* RTM_VERSION */
165
166/*
167 * sifproxyarp - Make a proxy ARP entry for the peer.
168 */
169int
170sifproxyarp(unit, hisaddr)
171 int unit;
172 u_long hisaddr;
173{
174 struct arpreq arpreq;
175 struct {
176 struct sockaddr_dl sdl;
177 char space[128];
178 } dls;
179
180 BZERO(&arpreq, sizeof(arpreq));
181
182 /*
183 * Get the hardware address of an interface on the same subnet
184 * as our local address.
185 */
186 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
187 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
188 return 0;
189 }
190
191 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
192 arpreq.arp_ha.sa_family = AF_UNSPEC;
193 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
194 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
195 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
196 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
197 if (ioctl(unit, SIOCSARP, (caddr_t)&arpreq) < 0) {
198 fprintf(stderr, "ioctl(SIOCSARP): \n");
199 return 0;
200 }
201
202 return 1;
203}
204
205/*
206 * cifproxyarp - Delete the proxy ARP entry for the peer.
207 */
208int
209cifproxyarp(unit, hisaddr)
210 int unit;
211 u_long hisaddr;
212{
213 struct arpreq arpreq;
214
215 BZERO(&arpreq, sizeof(arpreq));
216 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
217 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
218 if (ioctl(unit, SIOCDARP, (caddr_t)&arpreq) < 0) {
219 fprintf(stderr, "ioctl(SIOCDARP): \n");
220 return 0;
221 }
222 return 1;
223}
224#endif /* RTM_VERSION */
225
226
227/*
228 * get_ether_addr - get the hardware address of an interface on the
229 * the same subnet as ipaddr.
230 */
231#define MAX_IFS 32
232
233int
234get_ether_addr(s, ipaddr, hwaddr)
235 int s;
236 u_long ipaddr;
237 struct sockaddr_dl *hwaddr;
238{
239 struct ifreq *ifr, *ifend, *ifp;
240 u_long ina, mask;
241 struct sockaddr_dl *dla;
242 struct ifreq ifreq;
243 struct ifconf ifc;
244 struct ifreq ifs[MAX_IFS];
245
246 ifc.ifc_len = sizeof(ifs);
247 ifc.ifc_req = ifs;
248 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
249 fprintf(stderr, "ioctl(SIOCGIFCONF): \n");
250 return 0;
251 }
252
253 /*
254 * Scan through looking for an interface with an Internet
255 * address on the same subnet as `ipaddr'.
256 */
257 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
258 for (ifr = ifc.ifc_req; ifr < ifend; ) {
259 if (ifr->ifr_addr.sa_family == AF_INET) {
260 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
261 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
262 ifreq.ifr_name[sizeof(ifreq.ifr_name)-1]='\0';
263 /*
264 * Check that the interface is up, and not point-to-point
265 * or loopback.
266 */
267 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
268 continue;
269 if ((ifreq.ifr_flags &
270 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
271 != (IFF_UP|IFF_BROADCAST))
272 goto nextif;
273 /*
274 * Get its netmask and check that it's on the right subnet.
275 */
276 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
277 continue;
278 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
279 if ((ipaddr & mask) != (ina & mask))
280 goto nextif;
281
282 break;
283 }
284nextif:
285 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
286 }
287
288 if (ifr >= ifend)
289 return 0;
290 LogPrintf(LOG_PHASE_BIT, "found interface %s for proxy arp\n", ifr->ifr_name);
291
292 /*
293 * Now scan through again looking for a link-level address
294 * for this interface.
295 */
296 ifp = ifr;
297 for (ifr = ifc.ifc_req; ifr < ifend; ) {
298 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
299 && ifr->ifr_addr.sa_family == AF_LINK) {
300 /*
301 * Found the link-level address - copy it out
302 */
303 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
304#ifdef __bsdi__
305 if (dla->sdl_alen == 0)
306 kmemgetether(ifr->ifr_name, dla);
307#endif
308 BCOPY(dla, hwaddr, dla->sdl_len);
309 return 1;
310 }
311 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
312 }
313
314 return 0;
315}
316
317#ifdef __bsdi__
318#include <nlist.h>
319
320struct nlist nl[] = {
321#define N_IFNET 0
322 { "_ifnet" },
323 "",
324};
325
326
327kvm_t *kvmd;
328
329/*
330 * Read kernel memory, return 0 on success.
331 */
332int
333kread(addr, buf, size)
334 u_long addr;
335 char *buf;
336 int size;
337{
338
339 if (kvm_read(kvmd, addr, buf, size) != size) {
340 /* XXX this duplicates kvm_read's error printout */
341 (void)fprintf(stderr, "kvm_read %s\n",
342 kvm_geterr(kvmd));
343 return (-1);
344 }
345 return (0);
346}
347
348kmemgetether(ifname, dlo)
349char *ifname;
350struct sockaddr_dl *dlo;
351{
352 struct ifnet ifnet;
353 int n;
354 u_long addr, ifaddraddr, ifnetfound, ifaddrfound;
355 char name[16+32];
356 struct sockaddr *sa;
357 char *cp;
358 struct sockaddr_dl *sdl;
359 union {
360 struct ifaddr ifa;
361 struct in_ifaddr in;
362 } ifaddr;
363 struct arpcom ac;
364
365 kvmd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
366 if (kvmd) {
367 n = kvm_nlist(kvmd, nl);
368 if (n >= 0) {
369 addr = nl[N_IFNET].n_value;
370 kread(addr, (char *)&addr, sizeof(addr));
371 ifaddraddr = ifnetfound = 0;
372 while (addr || ifaddraddr) {
373 ifnetfound = addr;
374 if (ifaddraddr == 0) {
375 if (kread(addr, (char *)&ifnet, sizeof(ifnet)) ||
376 kread((u_long)ifnet.if_name, name, 16))
377 return;
378 name[15] = 0;
379 addr = (u_long) ifnet.if_next;
380 cp = (char *)index(name, '\0');
381 cp += sprintf(cp, "%d", ifnet.if_unit);
382 *cp = '\0';
383 ifaddraddr = (u_long)ifnet.if_addrlist;
384 }
385 ifaddrfound = ifaddraddr;
386 if (ifaddraddr) {
387 if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
388 ifaddraddr = 0;
389 continue;
390 }
391#define CP(x) ((char *)(x))
392 cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) + CP(&ifaddr);
393 sa = (struct sockaddr *)cp;
394 if (sa->sa_family == AF_LINK && strcmp(ifname, name) == 0) {
395 sdl = (struct sockaddr_dl *)sa;
396 cp = (char *)LLADDR(sdl);
397 n = sdl->sdl_alen;
398 if (ifnet.if_type == IFT_ETHER) {
399 if (n == 0) {
400 kread(ifnetfound, (char *)&ac, sizeof(ac));
401 cp = (char *)LLADDR(sdl);
402 bcopy((char *)ac.ac_enaddr, cp, 6);
403 sdl->sdl_alen = 6;
404 }
405 bcopy(sdl, dlo, sizeof(*sdl));
406 return;
407 }
408 }
409 ifaddraddr = (u_long)ifaddr.ifa.ifa_next;
410 }
411 }
412 }
413 }
414}
415#endif
416
417#ifdef DEBUG
418main()
419{
420 u_long ipaddr;
421 int s;
422
423 s = socket(AF_INET, SOCK_DGRAM, 0);
424 ipaddr = inet_addr("192.168.1.32");
425 sifproxyarp(s, ipaddr);
426 close(s);
427}
428#endif
| 42#include <net/route.h>
43#include <net/if_dl.h>
44#include <netinet/in.h>
45#include <stdio.h>
46#include <fcntl.h>
47#ifdef __bsdi__
48#include <kvm.h>
49#endif
50#include <net/if_types.h>
51#include <netinet/in_var.h>
52#include <netinet/if_ether.h>
53#include "log.h"
54
55#if RTM_VERSION >= 3
56#include <netinet/if_ether.h>
57#endif
58
59static int rtm_seq;
60
61static int get_ether_addr __P((int, u_long, struct sockaddr_dl *));
62
63#define BCOPY(s, d, l) memcpy(d, s, l)
64#define BZERO(s, n) memset(s, 0, n)
65/*
66 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
67 * if it exists.
68 */
69#define SET_SA_FAMILY(addr, family) \
70 BZERO((char *) &(addr), sizeof(addr)); \
71 addr.sa_family = (family); \
72 addr.sa_len = sizeof(addr);
73
74
75#if RTM_VERSION >= 3
76
77/*
78 * sifproxyarp - Make a proxy ARP entry for the peer.
79 */
80static struct {
81 struct rt_msghdr hdr;
82 struct sockaddr_inarp dst;
83 struct sockaddr_dl hwa;
84 char extra[128];
85} arpmsg;
86
87static int arpmsg_valid;
88
89int
90sifproxyarp(unit, hisaddr)
91 int unit;
92 u_long hisaddr;
93{
94 int routes;
95
96 /*
97 * Get the hardware address of an interface on the same subnet
98 * as our local address.
99 */
100 memset(&arpmsg, 0, sizeof(arpmsg));
101 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
102 logprintf("Cannot determine ethernet address for proxy ARP\n");
103 return 0;
104 }
105
106 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
107 logprintf("sifproxyarp: opening routing socket: \n");
108 return 0;
109 }
110
111 arpmsg.hdr.rtm_type = RTM_ADD;
112 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
113 arpmsg.hdr.rtm_version = RTM_VERSION;
114 arpmsg.hdr.rtm_seq = ++rtm_seq;
115 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
116 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
117 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
118 arpmsg.dst.sin_family = AF_INET;
119 arpmsg.dst.sin_addr.s_addr = hisaddr;
120 arpmsg.dst.sin_other = SIN_PROXY;
121
122 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
123 + arpmsg.hwa.sdl_len;
124 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
125 logprintf("add proxy arp entry: \n");
126 close(routes);
127 return 0;
128 }
129
130 close(routes);
131 arpmsg_valid = 1;
132 return 1;
133}
134
135/*
136 * cifproxyarp - Delete the proxy ARP entry for the peer.
137 */
138int
139cifproxyarp(unit, hisaddr)
140 int unit;
141 u_long hisaddr;
142{
143 int routes;
144
145 if (!arpmsg_valid)
146 return 0;
147 arpmsg_valid = 0;
148
149 arpmsg.hdr.rtm_type = RTM_DELETE;
150 arpmsg.hdr.rtm_seq = ++rtm_seq;
151
152 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
153 logprintf("sifproxyarp: opening routing socket: \n");
154 return 0;
155 }
156
157 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
158 logprintf("delete proxy arp entry: \n");
159 close(routes);
160 return 0;
161 }
162
163 close(routes);
164 return 1;
165}
166
167#else /* RTM_VERSION */
168
169/*
170 * sifproxyarp - Make a proxy ARP entry for the peer.
171 */
172int
173sifproxyarp(unit, hisaddr)
174 int unit;
175 u_long hisaddr;
176{
177 struct arpreq arpreq;
178 struct {
179 struct sockaddr_dl sdl;
180 char space[128];
181 } dls;
182
183 BZERO(&arpreq, sizeof(arpreq));
184
185 /*
186 * Get the hardware address of an interface on the same subnet
187 * as our local address.
188 */
189 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
190 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
191 return 0;
192 }
193
194 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
195 arpreq.arp_ha.sa_family = AF_UNSPEC;
196 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
197 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
198 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
199 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
200 if (ioctl(unit, SIOCSARP, (caddr_t)&arpreq) < 0) {
201 fprintf(stderr, "ioctl(SIOCSARP): \n");
202 return 0;
203 }
204
205 return 1;
206}
207
208/*
209 * cifproxyarp - Delete the proxy ARP entry for the peer.
210 */
211int
212cifproxyarp(unit, hisaddr)
213 int unit;
214 u_long hisaddr;
215{
216 struct arpreq arpreq;
217
218 BZERO(&arpreq, sizeof(arpreq));
219 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
220 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
221 if (ioctl(unit, SIOCDARP, (caddr_t)&arpreq) < 0) {
222 fprintf(stderr, "ioctl(SIOCDARP): \n");
223 return 0;
224 }
225 return 1;
226}
227#endif /* RTM_VERSION */
228
229
230/*
231 * get_ether_addr - get the hardware address of an interface on the
232 * the same subnet as ipaddr.
233 */
234#define MAX_IFS 32
235
236int
237get_ether_addr(s, ipaddr, hwaddr)
238 int s;
239 u_long ipaddr;
240 struct sockaddr_dl *hwaddr;
241{
242 struct ifreq *ifr, *ifend, *ifp;
243 u_long ina, mask;
244 struct sockaddr_dl *dla;
245 struct ifreq ifreq;
246 struct ifconf ifc;
247 struct ifreq ifs[MAX_IFS];
248
249 ifc.ifc_len = sizeof(ifs);
250 ifc.ifc_req = ifs;
251 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
252 fprintf(stderr, "ioctl(SIOCGIFCONF): \n");
253 return 0;
254 }
255
256 /*
257 * Scan through looking for an interface with an Internet
258 * address on the same subnet as `ipaddr'.
259 */
260 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
261 for (ifr = ifc.ifc_req; ifr < ifend; ) {
262 if (ifr->ifr_addr.sa_family == AF_INET) {
263 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
264 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
265 ifreq.ifr_name[sizeof(ifreq.ifr_name)-1]='\0';
266 /*
267 * Check that the interface is up, and not point-to-point
268 * or loopback.
269 */
270 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
271 continue;
272 if ((ifreq.ifr_flags &
273 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
274 != (IFF_UP|IFF_BROADCAST))
275 goto nextif;
276 /*
277 * Get its netmask and check that it's on the right subnet.
278 */
279 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
280 continue;
281 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
282 if ((ipaddr & mask) != (ina & mask))
283 goto nextif;
284
285 break;
286 }
287nextif:
288 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
289 }
290
291 if (ifr >= ifend)
292 return 0;
293 LogPrintf(LOG_PHASE_BIT, "found interface %s for proxy arp\n", ifr->ifr_name);
294
295 /*
296 * Now scan through again looking for a link-level address
297 * for this interface.
298 */
299 ifp = ifr;
300 for (ifr = ifc.ifc_req; ifr < ifend; ) {
301 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
302 && ifr->ifr_addr.sa_family == AF_LINK) {
303 /*
304 * Found the link-level address - copy it out
305 */
306 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
307#ifdef __bsdi__
308 if (dla->sdl_alen == 0)
309 kmemgetether(ifr->ifr_name, dla);
310#endif
311 BCOPY(dla, hwaddr, dla->sdl_len);
312 return 1;
313 }
314 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
315 }
316
317 return 0;
318}
319
320#ifdef __bsdi__
321#include <nlist.h>
322
323struct nlist nl[] = {
324#define N_IFNET 0
325 { "_ifnet" },
326 "",
327};
328
329
330kvm_t *kvmd;
331
332/*
333 * Read kernel memory, return 0 on success.
334 */
335int
336kread(addr, buf, size)
337 u_long addr;
338 char *buf;
339 int size;
340{
341
342 if (kvm_read(kvmd, addr, buf, size) != size) {
343 /* XXX this duplicates kvm_read's error printout */
344 (void)fprintf(stderr, "kvm_read %s\n",
345 kvm_geterr(kvmd));
346 return (-1);
347 }
348 return (0);
349}
350
351kmemgetether(ifname, dlo)
352char *ifname;
353struct sockaddr_dl *dlo;
354{
355 struct ifnet ifnet;
356 int n;
357 u_long addr, ifaddraddr, ifnetfound, ifaddrfound;
358 char name[16+32];
359 struct sockaddr *sa;
360 char *cp;
361 struct sockaddr_dl *sdl;
362 union {
363 struct ifaddr ifa;
364 struct in_ifaddr in;
365 } ifaddr;
366 struct arpcom ac;
367
368 kvmd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
369 if (kvmd) {
370 n = kvm_nlist(kvmd, nl);
371 if (n >= 0) {
372 addr = nl[N_IFNET].n_value;
373 kread(addr, (char *)&addr, sizeof(addr));
374 ifaddraddr = ifnetfound = 0;
375 while (addr || ifaddraddr) {
376 ifnetfound = addr;
377 if (ifaddraddr == 0) {
378 if (kread(addr, (char *)&ifnet, sizeof(ifnet)) ||
379 kread((u_long)ifnet.if_name, name, 16))
380 return;
381 name[15] = 0;
382 addr = (u_long) ifnet.if_next;
383 cp = (char *)index(name, '\0');
384 cp += sprintf(cp, "%d", ifnet.if_unit);
385 *cp = '\0';
386 ifaddraddr = (u_long)ifnet.if_addrlist;
387 }
388 ifaddrfound = ifaddraddr;
389 if (ifaddraddr) {
390 if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
391 ifaddraddr = 0;
392 continue;
393 }
394#define CP(x) ((char *)(x))
395 cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) + CP(&ifaddr);
396 sa = (struct sockaddr *)cp;
397 if (sa->sa_family == AF_LINK && strcmp(ifname, name) == 0) {
398 sdl = (struct sockaddr_dl *)sa;
399 cp = (char *)LLADDR(sdl);
400 n = sdl->sdl_alen;
401 if (ifnet.if_type == IFT_ETHER) {
402 if (n == 0) {
403 kread(ifnetfound, (char *)&ac, sizeof(ac));
404 cp = (char *)LLADDR(sdl);
405 bcopy((char *)ac.ac_enaddr, cp, 6);
406 sdl->sdl_alen = 6;
407 }
408 bcopy(sdl, dlo, sizeof(*sdl));
409 return;
410 }
411 }
412 ifaddraddr = (u_long)ifaddr.ifa.ifa_next;
413 }
414 }
415 }
416 }
417}
418#endif
419
420#ifdef DEBUG
421main()
422{
423 u_long ipaddr;
424 int s;
425
426 s = socket(AF_INET, SOCK_DGRAM, 0);
427 ipaddr = inet_addr("192.168.1.32");
428 sifproxyarp(s, ipaddr);
429 close(s);
430}
431#endif
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