Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * IPv4 Forwarding Information Base: FIB frontend. |
| 7 | * |
| 8 | * Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $ |
| 9 | * |
| 10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/config.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | #include <asm/system.h> |
| 22 | #include <linux/bitops.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/socket.h> |
| 29 | #include <linux/sockios.h> |
| 30 | #include <linux/errno.h> |
| 31 | #include <linux/in.h> |
| 32 | #include <linux/inet.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/if_arp.h> |
| 35 | #include <linux/skbuff.h> |
| 36 | #include <linux/netlink.h> |
| 37 | #include <linux/init.h> |
| 38 | |
| 39 | #include <net/ip.h> |
| 40 | #include <net/protocol.h> |
| 41 | #include <net/route.h> |
| 42 | #include <net/tcp.h> |
| 43 | #include <net/sock.h> |
| 44 | #include <net/icmp.h> |
| 45 | #include <net/arp.h> |
| 46 | #include <net/ip_fib.h> |
| 47 | |
| 48 | #define FFprint(a...) printk(KERN_DEBUG a) |
| 49 | |
| 50 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 51 | |
| 52 | #define RT_TABLE_MIN RT_TABLE_MAIN |
| 53 | |
| 54 | struct fib_table *ip_fib_local_table; |
| 55 | struct fib_table *ip_fib_main_table; |
| 56 | |
| 57 | #else |
| 58 | |
| 59 | #define RT_TABLE_MIN 1 |
| 60 | |
| 61 | struct fib_table *fib_tables[RT_TABLE_MAX+1]; |
| 62 | |
| 63 | struct fib_table *__fib_new_table(int id) |
| 64 | { |
| 65 | struct fib_table *tb; |
| 66 | |
| 67 | tb = fib_hash_init(id); |
| 68 | if (!tb) |
| 69 | return NULL; |
| 70 | fib_tables[id] = tb; |
| 71 | return tb; |
| 72 | } |
| 73 | |
| 74 | |
| 75 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 76 | |
| 77 | |
| 78 | static void fib_flush(void) |
| 79 | { |
| 80 | int flushed = 0; |
| 81 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 82 | struct fib_table *tb; |
| 83 | int id; |
| 84 | |
| 85 | for (id = RT_TABLE_MAX; id>0; id--) { |
| 86 | if ((tb = fib_get_table(id))==NULL) |
| 87 | continue; |
| 88 | flushed += tb->tb_flush(tb); |
| 89 | } |
| 90 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
| 91 | flushed += ip_fib_main_table->tb_flush(ip_fib_main_table); |
| 92 | flushed += ip_fib_local_table->tb_flush(ip_fib_local_table); |
| 93 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 94 | |
| 95 | if (flushed) |
| 96 | rt_cache_flush(-1); |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Find the first device with a given source address. |
| 101 | */ |
| 102 | |
| 103 | struct net_device * ip_dev_find(u32 addr) |
| 104 | { |
| 105 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 106 | struct fib_result res; |
| 107 | struct net_device *dev = NULL; |
| 108 | |
| 109 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 110 | res.r = NULL; |
| 111 | #endif |
| 112 | |
| 113 | if (!ip_fib_local_table || |
| 114 | ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res)) |
| 115 | return NULL; |
| 116 | if (res.type != RTN_LOCAL) |
| 117 | goto out; |
| 118 | dev = FIB_RES_DEV(res); |
| 119 | |
| 120 | if (dev) |
| 121 | dev_hold(dev); |
| 122 | out: |
| 123 | fib_res_put(&res); |
| 124 | return dev; |
| 125 | } |
| 126 | |
| 127 | unsigned inet_addr_type(u32 addr) |
| 128 | { |
| 129 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 130 | struct fib_result res; |
| 131 | unsigned ret = RTN_BROADCAST; |
| 132 | |
| 133 | if (ZERONET(addr) || BADCLASS(addr)) |
| 134 | return RTN_BROADCAST; |
| 135 | if (MULTICAST(addr)) |
| 136 | return RTN_MULTICAST; |
| 137 | |
| 138 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 139 | res.r = NULL; |
| 140 | #endif |
| 141 | |
| 142 | if (ip_fib_local_table) { |
| 143 | ret = RTN_UNICAST; |
| 144 | if (!ip_fib_local_table->tb_lookup(ip_fib_local_table, |
| 145 | &fl, &res)) { |
| 146 | ret = res.type; |
| 147 | fib_res_put(&res); |
| 148 | } |
| 149 | } |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
| 154 | - (main) check, that source is valid i.e. not broadcast or our local |
| 155 | address. |
| 156 | - figure out what "logical" interface this packet arrived |
| 157 | and calculate "specific destination" address. |
| 158 | - check, that packet arrived from expected physical interface. |
| 159 | */ |
| 160 | |
| 161 | int fib_validate_source(u32 src, u32 dst, u8 tos, int oif, |
| 162 | struct net_device *dev, u32 *spec_dst, u32 *itag) |
| 163 | { |
| 164 | struct in_device *in_dev; |
| 165 | struct flowi fl = { .nl_u = { .ip4_u = |
| 166 | { .daddr = src, |
| 167 | .saddr = dst, |
| 168 | .tos = tos } }, |
| 169 | .iif = oif }; |
| 170 | struct fib_result res; |
| 171 | int no_addr, rpf; |
| 172 | int ret; |
| 173 | |
| 174 | no_addr = rpf = 0; |
| 175 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 176 | in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | if (in_dev) { |
| 178 | no_addr = in_dev->ifa_list == NULL; |
| 179 | rpf = IN_DEV_RPFILTER(in_dev); |
| 180 | } |
| 181 | rcu_read_unlock(); |
| 182 | |
| 183 | if (in_dev == NULL) |
| 184 | goto e_inval; |
| 185 | |
| 186 | if (fib_lookup(&fl, &res)) |
| 187 | goto last_resort; |
| 188 | if (res.type != RTN_UNICAST) |
| 189 | goto e_inval_res; |
| 190 | *spec_dst = FIB_RES_PREFSRC(res); |
| 191 | fib_combine_itag(itag, &res); |
| 192 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 193 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) |
| 194 | #else |
| 195 | if (FIB_RES_DEV(res) == dev) |
| 196 | #endif |
| 197 | { |
| 198 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 199 | fib_res_put(&res); |
| 200 | return ret; |
| 201 | } |
| 202 | fib_res_put(&res); |
| 203 | if (no_addr) |
| 204 | goto last_resort; |
| 205 | if (rpf) |
| 206 | goto e_inval; |
| 207 | fl.oif = dev->ifindex; |
| 208 | |
| 209 | ret = 0; |
| 210 | if (fib_lookup(&fl, &res) == 0) { |
| 211 | if (res.type == RTN_UNICAST) { |
| 212 | *spec_dst = FIB_RES_PREFSRC(res); |
| 213 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 214 | } |
| 215 | fib_res_put(&res); |
| 216 | } |
| 217 | return ret; |
| 218 | |
| 219 | last_resort: |
| 220 | if (rpf) |
| 221 | goto e_inval; |
| 222 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 223 | *itag = 0; |
| 224 | return 0; |
| 225 | |
| 226 | e_inval_res: |
| 227 | fib_res_put(&res); |
| 228 | e_inval: |
| 229 | return -EINVAL; |
| 230 | } |
| 231 | |
| 232 | #ifndef CONFIG_IP_NOSIOCRT |
| 233 | |
| 234 | /* |
| 235 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables |
| 236 | */ |
| 237 | |
| 238 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
| 239 | { |
| 240 | int err; |
| 241 | struct kern_rta rta; |
| 242 | struct rtentry r; |
| 243 | struct { |
| 244 | struct nlmsghdr nlh; |
| 245 | struct rtmsg rtm; |
| 246 | } req; |
| 247 | |
| 248 | switch (cmd) { |
| 249 | case SIOCADDRT: /* Add a route */ |
| 250 | case SIOCDELRT: /* Delete a route */ |
| 251 | if (!capable(CAP_NET_ADMIN)) |
| 252 | return -EPERM; |
| 253 | if (copy_from_user(&r, arg, sizeof(struct rtentry))) |
| 254 | return -EFAULT; |
| 255 | rtnl_lock(); |
| 256 | err = fib_convert_rtentry(cmd, &req.nlh, &req.rtm, &rta, &r); |
| 257 | if (err == 0) { |
| 258 | if (cmd == SIOCDELRT) { |
| 259 | struct fib_table *tb = fib_get_table(req.rtm.rtm_table); |
| 260 | err = -ESRCH; |
| 261 | if (tb) |
| 262 | err = tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL); |
| 263 | } else { |
| 264 | struct fib_table *tb = fib_new_table(req.rtm.rtm_table); |
| 265 | err = -ENOBUFS; |
| 266 | if (tb) |
| 267 | err = tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL); |
| 268 | } |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame^] | 269 | kfree(rta.rta_mx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | } |
| 271 | rtnl_unlock(); |
| 272 | return err; |
| 273 | } |
| 274 | return -EINVAL; |
| 275 | } |
| 276 | |
| 277 | #else |
| 278 | |
| 279 | int ip_rt_ioctl(unsigned int cmd, void *arg) |
| 280 | { |
| 281 | return -EINVAL; |
| 282 | } |
| 283 | |
| 284 | #endif |
| 285 | |
| 286 | static int inet_check_attr(struct rtmsg *r, struct rtattr **rta) |
| 287 | { |
| 288 | int i; |
| 289 | |
| 290 | for (i=1; i<=RTA_MAX; i++) { |
| 291 | struct rtattr *attr = rta[i-1]; |
| 292 | if (attr) { |
| 293 | if (RTA_PAYLOAD(attr) < 4) |
| 294 | return -EINVAL; |
| 295 | if (i != RTA_MULTIPATH && i != RTA_METRICS) |
| 296 | rta[i-1] = (struct rtattr*)RTA_DATA(attr); |
| 297 | } |
| 298 | } |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 303 | { |
| 304 | struct fib_table * tb; |
| 305 | struct rtattr **rta = arg; |
| 306 | struct rtmsg *r = NLMSG_DATA(nlh); |
| 307 | |
| 308 | if (inet_check_attr(r, rta)) |
| 309 | return -EINVAL; |
| 310 | |
| 311 | tb = fib_get_table(r->rtm_table); |
| 312 | if (tb) |
| 313 | return tb->tb_delete(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb)); |
| 314 | return -ESRCH; |
| 315 | } |
| 316 | |
| 317 | int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 318 | { |
| 319 | struct fib_table * tb; |
| 320 | struct rtattr **rta = arg; |
| 321 | struct rtmsg *r = NLMSG_DATA(nlh); |
| 322 | |
| 323 | if (inet_check_attr(r, rta)) |
| 324 | return -EINVAL; |
| 325 | |
| 326 | tb = fib_new_table(r->rtm_table); |
| 327 | if (tb) |
| 328 | return tb->tb_insert(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb)); |
| 329 | return -ENOBUFS; |
| 330 | } |
| 331 | |
| 332 | int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
| 333 | { |
| 334 | int t; |
| 335 | int s_t; |
| 336 | struct fib_table *tb; |
| 337 | |
| 338 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && |
| 339 | ((struct rtmsg*)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) |
| 340 | return ip_rt_dump(skb, cb); |
| 341 | |
| 342 | s_t = cb->args[0]; |
| 343 | if (s_t == 0) |
| 344 | s_t = cb->args[0] = RT_TABLE_MIN; |
| 345 | |
| 346 | for (t=s_t; t<=RT_TABLE_MAX; t++) { |
| 347 | if (t < s_t) continue; |
| 348 | if (t > s_t) |
| 349 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 350 | if ((tb = fib_get_table(t))==NULL) |
| 351 | continue; |
| 352 | if (tb->tb_dump(tb, skb, cb) < 0) |
| 353 | break; |
| 354 | } |
| 355 | |
| 356 | cb->args[0] = t; |
| 357 | |
| 358 | return skb->len; |
| 359 | } |
| 360 | |
| 361 | /* Prepare and feed intra-kernel routing request. |
| 362 | Really, it should be netlink message, but :-( netlink |
| 363 | can be not configured, so that we feed it directly |
| 364 | to fib engine. It is legal, because all events occur |
| 365 | only when netlink is already locked. |
| 366 | */ |
| 367 | |
| 368 | static void fib_magic(int cmd, int type, u32 dst, int dst_len, struct in_ifaddr *ifa) |
| 369 | { |
| 370 | struct fib_table * tb; |
| 371 | struct { |
| 372 | struct nlmsghdr nlh; |
| 373 | struct rtmsg rtm; |
| 374 | } req; |
| 375 | struct kern_rta rta; |
| 376 | |
| 377 | memset(&req.rtm, 0, sizeof(req.rtm)); |
| 378 | memset(&rta, 0, sizeof(rta)); |
| 379 | |
| 380 | if (type == RTN_UNICAST) |
| 381 | tb = fib_new_table(RT_TABLE_MAIN); |
| 382 | else |
| 383 | tb = fib_new_table(RT_TABLE_LOCAL); |
| 384 | |
| 385 | if (tb == NULL) |
| 386 | return; |
| 387 | |
| 388 | req.nlh.nlmsg_len = sizeof(req); |
| 389 | req.nlh.nlmsg_type = cmd; |
| 390 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; |
| 391 | req.nlh.nlmsg_pid = 0; |
| 392 | req.nlh.nlmsg_seq = 0; |
| 393 | |
| 394 | req.rtm.rtm_dst_len = dst_len; |
| 395 | req.rtm.rtm_table = tb->tb_id; |
| 396 | req.rtm.rtm_protocol = RTPROT_KERNEL; |
| 397 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); |
| 398 | req.rtm.rtm_type = type; |
| 399 | |
| 400 | rta.rta_dst = &dst; |
| 401 | rta.rta_prefsrc = &ifa->ifa_local; |
| 402 | rta.rta_oif = &ifa->ifa_dev->dev->ifindex; |
| 403 | |
| 404 | if (cmd == RTM_NEWROUTE) |
| 405 | tb->tb_insert(tb, &req.rtm, &rta, &req.nlh, NULL); |
| 406 | else |
| 407 | tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL); |
| 408 | } |
| 409 | |
| 410 | static void fib_add_ifaddr(struct in_ifaddr *ifa) |
| 411 | { |
| 412 | struct in_device *in_dev = ifa->ifa_dev; |
| 413 | struct net_device *dev = in_dev->dev; |
| 414 | struct in_ifaddr *prim = ifa; |
| 415 | u32 mask = ifa->ifa_mask; |
| 416 | u32 addr = ifa->ifa_local; |
| 417 | u32 prefix = ifa->ifa_address&mask; |
| 418 | |
| 419 | if (ifa->ifa_flags&IFA_F_SECONDARY) { |
| 420 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
| 421 | if (prim == NULL) { |
| 422 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); |
| 423 | return; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
| 428 | |
| 429 | if (!(dev->flags&IFF_UP)) |
| 430 | return; |
| 431 | |
| 432 | /* Add broadcast address, if it is explicitly assigned. */ |
| 433 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != 0xFFFFFFFF) |
| 434 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 435 | |
| 436 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
| 437 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
| 438 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 439 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); |
| 440 | |
| 441 | /* Add network specific broadcasts, when it takes a sense */ |
| 442 | if (ifa->ifa_prefixlen < 31) { |
| 443 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
| 444 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); |
| 445 | } |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | static void fib_del_ifaddr(struct in_ifaddr *ifa) |
| 450 | { |
| 451 | struct in_device *in_dev = ifa->ifa_dev; |
| 452 | struct net_device *dev = in_dev->dev; |
| 453 | struct in_ifaddr *ifa1; |
| 454 | struct in_ifaddr *prim = ifa; |
| 455 | u32 brd = ifa->ifa_address|~ifa->ifa_mask; |
| 456 | u32 any = ifa->ifa_address&ifa->ifa_mask; |
| 457 | #define LOCAL_OK 1 |
| 458 | #define BRD_OK 2 |
| 459 | #define BRD0_OK 4 |
| 460 | #define BRD1_OK 8 |
| 461 | unsigned ok = 0; |
| 462 | |
| 463 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) |
| 464 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 465 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); |
| 466 | else { |
| 467 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
| 468 | if (prim == NULL) { |
| 469 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); |
| 470 | return; |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /* Deletion is more complicated than add. |
| 475 | We should take care of not to delete too much :-) |
| 476 | |
| 477 | Scan address list to be sure that addresses are really gone. |
| 478 | */ |
| 479 | |
| 480 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { |
| 481 | if (ifa->ifa_local == ifa1->ifa_local) |
| 482 | ok |= LOCAL_OK; |
| 483 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) |
| 484 | ok |= BRD_OK; |
| 485 | if (brd == ifa1->ifa_broadcast) |
| 486 | ok |= BRD1_OK; |
| 487 | if (any == ifa1->ifa_broadcast) |
| 488 | ok |= BRD0_OK; |
| 489 | } |
| 490 | |
| 491 | if (!(ok&BRD_OK)) |
| 492 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 493 | if (!(ok&BRD1_OK)) |
| 494 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
| 495 | if (!(ok&BRD0_OK)) |
| 496 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
| 497 | if (!(ok&LOCAL_OK)) { |
| 498 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
| 499 | |
| 500 | /* Check, that this local address finally disappeared. */ |
| 501 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { |
| 502 | /* And the last, but not the least thing. |
| 503 | We must flush stray FIB entries. |
| 504 | |
| 505 | First of all, we scan fib_info list searching |
| 506 | for stray nexthop entries, then ignite fib_flush. |
| 507 | */ |
| 508 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) |
| 509 | fib_flush(); |
| 510 | } |
| 511 | } |
| 512 | #undef LOCAL_OK |
| 513 | #undef BRD_OK |
| 514 | #undef BRD0_OK |
| 515 | #undef BRD1_OK |
| 516 | } |
| 517 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 518 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
| 519 | { |
| 520 | |
| 521 | struct fib_result res; |
| 522 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
| 523 | .fwmark = frn->fl_fwmark, |
| 524 | .tos = frn->fl_tos, |
| 525 | .scope = frn->fl_scope } } }; |
| 526 | if (tb) { |
| 527 | local_bh_disable(); |
| 528 | |
| 529 | frn->tb_id = tb->tb_id; |
| 530 | frn->err = tb->tb_lookup(tb, &fl, &res); |
| 531 | |
| 532 | if (!frn->err) { |
| 533 | frn->prefixlen = res.prefixlen; |
| 534 | frn->nh_sel = res.nh_sel; |
| 535 | frn->type = res.type; |
| 536 | frn->scope = res.scope; |
| 537 | } |
| 538 | local_bh_enable(); |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | static void nl_fib_input(struct sock *sk, int len) |
| 543 | { |
| 544 | struct sk_buff *skb = NULL; |
| 545 | struct nlmsghdr *nlh = NULL; |
| 546 | struct fib_result_nl *frn; |
| 547 | int err; |
| 548 | u32 pid; |
| 549 | struct fib_table *tb; |
| 550 | |
| 551 | skb = skb_recv_datagram(sk, 0, 0, &err); |
| 552 | nlh = (struct nlmsghdr *)skb->data; |
| 553 | |
| 554 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
| 555 | tb = fib_get_table(frn->tb_id_in); |
| 556 | |
| 557 | nl_fib_lookup(frn, tb); |
| 558 | |
| 559 | pid = nlh->nlmsg_pid; /*pid of sending process */ |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 560 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
| 561 | NETLINK_CB(skb).dst_pid = pid; |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 562 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 563 | netlink_unicast(sk, skb, pid, MSG_DONTWAIT); |
| 564 | } |
| 565 | |
| 566 | static void nl_fib_lookup_init(void) |
| 567 | { |
Patrick McHardy | 0662860 | 2005-08-15 12:33:26 -0700 | [diff] [blame] | 568 | netlink_kernel_create(NETLINK_FIB_LOOKUP, 0, nl_fib_input, THIS_MODULE); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 569 | } |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | static void fib_disable_ip(struct net_device *dev, int force) |
| 572 | { |
| 573 | if (fib_sync_down(0, dev, force)) |
| 574 | fib_flush(); |
| 575 | rt_cache_flush(0); |
| 576 | arp_ifdown(dev); |
| 577 | } |
| 578 | |
| 579 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 580 | { |
| 581 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; |
| 582 | |
| 583 | switch (event) { |
| 584 | case NETDEV_UP: |
| 585 | fib_add_ifaddr(ifa); |
| 586 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 587 | fib_sync_up(ifa->ifa_dev->dev); |
| 588 | #endif |
| 589 | rt_cache_flush(-1); |
| 590 | break; |
| 591 | case NETDEV_DOWN: |
| 592 | fib_del_ifaddr(ifa); |
Jayachandran C | 9fcc2e8 | 2005-10-27 15:10:01 -0700 | [diff] [blame] | 593 | if (ifa->ifa_dev->ifa_list == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | /* Last address was deleted from this interface. |
| 595 | Disable IP. |
| 596 | */ |
| 597 | fib_disable_ip(ifa->ifa_dev->dev, 1); |
| 598 | } else { |
| 599 | rt_cache_flush(-1); |
| 600 | } |
| 601 | break; |
| 602 | } |
| 603 | return NOTIFY_DONE; |
| 604 | } |
| 605 | |
| 606 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 607 | { |
| 608 | struct net_device *dev = ptr; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 609 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | if (event == NETDEV_UNREGISTER) { |
| 612 | fib_disable_ip(dev, 2); |
| 613 | return NOTIFY_DONE; |
| 614 | } |
| 615 | |
| 616 | if (!in_dev) |
| 617 | return NOTIFY_DONE; |
| 618 | |
| 619 | switch (event) { |
| 620 | case NETDEV_UP: |
| 621 | for_ifa(in_dev) { |
| 622 | fib_add_ifaddr(ifa); |
| 623 | } endfor_ifa(in_dev); |
| 624 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 625 | fib_sync_up(dev); |
| 626 | #endif |
| 627 | rt_cache_flush(-1); |
| 628 | break; |
| 629 | case NETDEV_DOWN: |
| 630 | fib_disable_ip(dev, 0); |
| 631 | break; |
| 632 | case NETDEV_CHANGEMTU: |
| 633 | case NETDEV_CHANGE: |
| 634 | rt_cache_flush(0); |
| 635 | break; |
| 636 | } |
| 637 | return NOTIFY_DONE; |
| 638 | } |
| 639 | |
| 640 | static struct notifier_block fib_inetaddr_notifier = { |
| 641 | .notifier_call =fib_inetaddr_event, |
| 642 | }; |
| 643 | |
| 644 | static struct notifier_block fib_netdev_notifier = { |
| 645 | .notifier_call =fib_netdev_event, |
| 646 | }; |
| 647 | |
| 648 | void __init ip_fib_init(void) |
| 649 | { |
| 650 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 651 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); |
| 652 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
| 653 | #else |
| 654 | fib_rules_init(); |
| 655 | #endif |
| 656 | |
| 657 | register_netdevice_notifier(&fib_netdev_notifier); |
| 658 | register_inetaddr_notifier(&fib_inetaddr_notifier); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 659 | nl_fib_lookup_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | EXPORT_SYMBOL(inet_addr_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | EXPORT_SYMBOL(ip_rt_ioctl); |