Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * DECnet An implementation of the DECnet protocol suite for the LINUX |
| 3 | * operating system. DECnet is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * DECnet Routing Functions (Endnode and Router) |
| 7 | * |
| 8 | * Authors: Steve Whitehouse <SteveW@ACM.org> |
| 9 | * Eduardo Marcelo Serrat <emserrat@geocities.com> |
| 10 | * |
| 11 | * Changes: |
| 12 | * Steve Whitehouse : Fixes to allow "intra-ethernet" and |
| 13 | * "return-to-sender" bits on outgoing |
| 14 | * packets. |
| 15 | * Steve Whitehouse : Timeouts for cached routes. |
| 16 | * Steve Whitehouse : Use dst cache for input routes too. |
| 17 | * Steve Whitehouse : Fixed error values in dn_send_skb. |
| 18 | * Steve Whitehouse : Rework routing functions to better fit |
| 19 | * DECnet routing design |
| 20 | * Alexey Kuznetsov : New SMP locking |
| 21 | * Steve Whitehouse : More SMP locking changes & dn_cache_dump() |
| 22 | * Steve Whitehouse : Prerouting NF hook, now really is prerouting. |
| 23 | * Fixed possible skb leak in rtnetlink funcs. |
| 24 | * Steve Whitehouse : Dave Miller's dynamic hash table sizing and |
| 25 | * Alexey Kuznetsov's finer grained locking |
| 26 | * from ipv4/route.c. |
| 27 | * Steve Whitehouse : Routing is now starting to look like a |
| 28 | * sensible set of code now, mainly due to |
| 29 | * my copying the IPv4 routing code. The |
| 30 | * hooks here are modified and will continue |
| 31 | * to evolve for a while. |
| 32 | * Steve Whitehouse : Real SMP at last :-) Also new netfilter |
| 33 | * stuff. Look out raw sockets your days |
| 34 | * are numbered! |
| 35 | * Steve Whitehouse : Added return-to-sender functions. Added |
| 36 | * backlog congestion level return codes. |
| 37 | * Steve Whitehouse : Fixed bug where routes were set up with |
| 38 | * no ref count on net devices. |
| 39 | * Steve Whitehouse : RCU for the route cache |
| 40 | * Steve Whitehouse : Preparations for the flow cache |
| 41 | * Steve Whitehouse : Prepare for nonlinear skbs |
| 42 | */ |
| 43 | |
| 44 | /****************************************************************************** |
| 45 | (c) 1995-1998 E.M. Serrat emserrat@geocities.com |
| 46 | |
| 47 | This program is free software; you can redistribute it and/or modify |
| 48 | it under the terms of the GNU General Public License as published by |
| 49 | the Free Software Foundation; either version 2 of the License, or |
| 50 | any later version. |
| 51 | |
| 52 | This program is distributed in the hope that it will be useful, |
| 53 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 54 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 55 | GNU General Public License for more details. |
| 56 | *******************************************************************************/ |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/errno.h> |
| 59 | #include <linux/types.h> |
| 60 | #include <linux/socket.h> |
| 61 | #include <linux/in.h> |
| 62 | #include <linux/kernel.h> |
| 63 | #include <linux/sockios.h> |
| 64 | #include <linux/net.h> |
| 65 | #include <linux/netdevice.h> |
| 66 | #include <linux/inet.h> |
| 67 | #include <linux/route.h> |
| 68 | #include <linux/in_route.h> |
| 69 | #include <net/sock.h> |
| 70 | #include <linux/mm.h> |
| 71 | #include <linux/proc_fs.h> |
| 72 | #include <linux/seq_file.h> |
| 73 | #include <linux/init.h> |
| 74 | #include <linux/rtnetlink.h> |
| 75 | #include <linux/string.h> |
| 76 | #include <linux/netfilter_decnet.h> |
| 77 | #include <linux/rcupdate.h> |
| 78 | #include <linux/times.h> |
| 79 | #include <asm/errno.h> |
| 80 | #include <net/neighbour.h> |
| 81 | #include <net/dst.h> |
| 82 | #include <net/flow.h> |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 83 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <net/dn.h> |
| 85 | #include <net/dn_dev.h> |
| 86 | #include <net/dn_nsp.h> |
| 87 | #include <net/dn_route.h> |
| 88 | #include <net/dn_neigh.h> |
| 89 | #include <net/dn_fib.h> |
| 90 | |
| 91 | struct dn_rt_hash_bucket |
| 92 | { |
| 93 | struct dn_route *chain; |
| 94 | spinlock_t lock; |
| 95 | } __attribute__((__aligned__(8))); |
| 96 | |
| 97 | extern struct neigh_table dn_neigh_table; |
| 98 | |
| 99 | |
| 100 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; |
| 101 | |
| 102 | static const int dn_rt_min_delay = 2 * HZ; |
| 103 | static const int dn_rt_max_delay = 10 * HZ; |
| 104 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; |
| 105 | |
| 106 | static unsigned long dn_rt_deadline; |
| 107 | |
| 108 | static int dn_dst_gc(void); |
| 109 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
| 110 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
| 111 | static void dn_dst_link_failure(struct sk_buff *); |
| 112 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 113 | static int dn_route_input(struct sk_buff *); |
| 114 | static void dn_run_flush(unsigned long dummy); |
| 115 | |
| 116 | static struct dn_rt_hash_bucket *dn_rt_hash_table; |
| 117 | static unsigned dn_rt_hash_mask; |
| 118 | |
| 119 | static struct timer_list dn_route_timer; |
Ingo Molnar | 8d06afa | 2005-09-09 13:10:40 -0700 | [diff] [blame] | 120 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | int decnet_dst_gc_interval = 2; |
| 122 | |
| 123 | static struct dst_ops dn_dst_ops = { |
| 124 | .family = PF_DECnet, |
| 125 | .protocol = __constant_htons(ETH_P_DNA_RT), |
| 126 | .gc_thresh = 128, |
| 127 | .gc = dn_dst_gc, |
| 128 | .check = dn_dst_check, |
| 129 | .negative_advice = dn_dst_negative_advice, |
| 130 | .link_failure = dn_dst_link_failure, |
| 131 | .update_pmtu = dn_dst_update_pmtu, |
| 132 | .entry_size = sizeof(struct dn_route), |
| 133 | .entries = ATOMIC_INIT(0), |
| 134 | }; |
| 135 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 136 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 138 | __u16 tmp = (__u16 __force)(src ^ dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | tmp ^= (tmp >> 3); |
| 140 | tmp ^= (tmp >> 5); |
| 141 | tmp ^= (tmp >> 10); |
| 142 | return dn_rt_hash_mask & (unsigned)tmp; |
| 143 | } |
| 144 | |
| 145 | static inline void dnrt_free(struct dn_route *rt) |
| 146 | { |
| 147 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 148 | } |
| 149 | |
| 150 | static inline void dnrt_drop(struct dn_route *rt) |
| 151 | { |
Adrian Bunk | 3400112 | 2006-03-20 23:00:29 -0800 | [diff] [blame] | 152 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 154 | } |
| 155 | |
| 156 | static void dn_dst_check_expire(unsigned long dummy) |
| 157 | { |
| 158 | int i; |
| 159 | struct dn_route *rt, **rtp; |
| 160 | unsigned long now = jiffies; |
| 161 | unsigned long expire = 120 * HZ; |
| 162 | |
| 163 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 164 | rtp = &dn_rt_hash_table[i].chain; |
| 165 | |
| 166 | spin_lock(&dn_rt_hash_table[i].lock); |
| 167 | while((rt=*rtp) != NULL) { |
| 168 | if (atomic_read(&rt->u.dst.__refcnt) || |
| 169 | (now - rt->u.dst.lastuse) < expire) { |
| 170 | rtp = &rt->u.rt_next; |
| 171 | continue; |
| 172 | } |
| 173 | *rtp = rt->u.rt_next; |
| 174 | rt->u.rt_next = NULL; |
| 175 | dnrt_free(rt); |
| 176 | } |
| 177 | spin_unlock(&dn_rt_hash_table[i].lock); |
| 178 | |
| 179 | if ((jiffies - now) > 0) |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); |
| 184 | } |
| 185 | |
| 186 | static int dn_dst_gc(void) |
| 187 | { |
| 188 | struct dn_route *rt, **rtp; |
| 189 | int i; |
| 190 | unsigned long now = jiffies; |
| 191 | unsigned long expire = 10 * HZ; |
| 192 | |
| 193 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 194 | |
| 195 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
| 196 | rtp = &dn_rt_hash_table[i].chain; |
| 197 | |
| 198 | while((rt=*rtp) != NULL) { |
| 199 | if (atomic_read(&rt->u.dst.__refcnt) || |
| 200 | (now - rt->u.dst.lastuse) < expire) { |
| 201 | rtp = &rt->u.rt_next; |
| 202 | continue; |
| 203 | } |
| 204 | *rtp = rt->u.rt_next; |
| 205 | rt->u.rt_next = NULL; |
| 206 | dnrt_drop(rt); |
| 207 | break; |
| 208 | } |
| 209 | spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * The decnet standards don't impose a particular minimum mtu, what they |
| 217 | * do insist on is that the routing layer accepts a datagram of at least |
| 218 | * 230 bytes long. Here we have to subtract the routing header length from |
| 219 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we |
| 220 | * assume the worst and use a long header size. |
| 221 | * |
| 222 | * We update both the mtu and the advertised mss (i.e. the segment size we |
| 223 | * advertise to the other end). |
| 224 | */ |
| 225 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 226 | { |
| 227 | u32 min_mtu = 230; |
| 228 | struct dn_dev *dn = dst->neighbour ? |
| 229 | (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL; |
| 230 | |
| 231 | if (dn && dn->use_long == 0) |
| 232 | min_mtu -= 6; |
| 233 | else |
| 234 | min_mtu -= 21; |
| 235 | |
| 236 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) { |
| 237 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
| 238 | dst->metrics[RTAX_MTU-1] = mtu; |
| 239 | dst_set_expires(dst, dn_rt_mtu_expires); |
| 240 | } |
| 241 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { |
| 242 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; |
| 243 | if (dst->metrics[RTAX_ADVMSS-1] > mss) |
| 244 | dst->metrics[RTAX_ADVMSS-1] = mss; |
| 245 | } |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * When a route has been marked obsolete. (e.g. routing cache flush) |
| 251 | */ |
| 252 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) |
| 253 | { |
| 254 | return NULL; |
| 255 | } |
| 256 | |
| 257 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) |
| 258 | { |
| 259 | dst_release(dst); |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | static void dn_dst_link_failure(struct sk_buff *skb) |
| 264 | { |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
| 269 | { |
| 270 | return memcmp(&fl1->nl_u.dn_u, &fl2->nl_u.dn_u, sizeof(fl1->nl_u.dn_u)) == 0 && |
| 271 | fl1->oif == fl2->oif && |
| 272 | fl1->iif == fl2->iif; |
| 273 | } |
| 274 | |
| 275 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) |
| 276 | { |
| 277 | struct dn_route *rth, **rthp; |
| 278 | unsigned long now = jiffies; |
| 279 | |
| 280 | rthp = &dn_rt_hash_table[hash].chain; |
| 281 | |
| 282 | spin_lock_bh(&dn_rt_hash_table[hash].lock); |
| 283 | while((rth = *rthp) != NULL) { |
| 284 | if (compare_keys(&rth->fl, &rt->fl)) { |
| 285 | /* Put it first */ |
| 286 | *rthp = rth->u.rt_next; |
| 287 | rcu_assign_pointer(rth->u.rt_next, |
| 288 | dn_rt_hash_table[hash].chain); |
| 289 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); |
| 290 | |
| 291 | rth->u.dst.__use++; |
| 292 | dst_hold(&rth->u.dst); |
| 293 | rth->u.dst.lastuse = now; |
| 294 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| 295 | |
| 296 | dnrt_drop(rt); |
| 297 | *rp = rth; |
| 298 | return 0; |
| 299 | } |
| 300 | rthp = &rth->u.rt_next; |
| 301 | } |
| 302 | |
| 303 | rcu_assign_pointer(rt->u.rt_next, dn_rt_hash_table[hash].chain); |
| 304 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
| 305 | |
| 306 | dst_hold(&rt->u.dst); |
| 307 | rt->u.dst.__use++; |
| 308 | rt->u.dst.lastuse = now; |
| 309 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| 310 | *rp = rt; |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | void dn_run_flush(unsigned long dummy) |
| 315 | { |
| 316 | int i; |
| 317 | struct dn_route *rt, *next; |
| 318 | |
| 319 | for(i = 0; i < dn_rt_hash_mask; i++) { |
| 320 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
| 321 | |
| 322 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) |
| 323 | goto nothing_to_declare; |
| 324 | |
| 325 | for(; rt; rt=next) { |
| 326 | next = rt->u.rt_next; |
| 327 | rt->u.rt_next = NULL; |
| 328 | dst_free((struct dst_entry *)rt); |
| 329 | } |
| 330 | |
| 331 | nothing_to_declare: |
| 332 | spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static DEFINE_SPINLOCK(dn_rt_flush_lock); |
| 337 | |
| 338 | void dn_rt_cache_flush(int delay) |
| 339 | { |
| 340 | unsigned long now = jiffies; |
| 341 | int user_mode = !in_interrupt(); |
| 342 | |
| 343 | if (delay < 0) |
| 344 | delay = dn_rt_min_delay; |
| 345 | |
| 346 | spin_lock_bh(&dn_rt_flush_lock); |
| 347 | |
| 348 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { |
| 349 | long tmo = (long)(dn_rt_deadline - now); |
| 350 | |
| 351 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) |
| 352 | tmo = 0; |
| 353 | |
| 354 | if (delay > tmo) |
| 355 | delay = tmo; |
| 356 | } |
| 357 | |
| 358 | if (delay <= 0) { |
| 359 | spin_unlock_bh(&dn_rt_flush_lock); |
| 360 | dn_run_flush(0); |
| 361 | return; |
| 362 | } |
| 363 | |
| 364 | if (dn_rt_deadline == 0) |
| 365 | dn_rt_deadline = now + dn_rt_max_delay; |
| 366 | |
| 367 | dn_rt_flush_timer.expires = now + delay; |
| 368 | add_timer(&dn_rt_flush_timer); |
| 369 | spin_unlock_bh(&dn_rt_flush_lock); |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * dn_return_short - Return a short packet to its sender |
| 374 | * @skb: The packet to return |
| 375 | * |
| 376 | */ |
| 377 | static int dn_return_short(struct sk_buff *skb) |
| 378 | { |
| 379 | struct dn_skb_cb *cb; |
| 380 | unsigned char *ptr; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 381 | __le16 *src; |
| 382 | __le16 *dst; |
| 383 | __le16 tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | /* Add back headers */ |
| 386 | skb_push(skb, skb->data - skb->nh.raw); |
| 387 | |
| 388 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| 389 | return NET_RX_DROP; |
| 390 | |
| 391 | cb = DN_SKB_CB(skb); |
| 392 | /* Skip packet length and point to flags */ |
| 393 | ptr = skb->data + 2; |
| 394 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| 395 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 396 | dst = (__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 398 | src = (__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | ptr += 2; |
| 400 | *ptr = 0; /* Zero hop count */ |
| 401 | |
| 402 | /* Swap source and destination */ |
| 403 | tmp = *src; |
| 404 | *src = *dst; |
| 405 | *dst = tmp; |
| 406 | |
| 407 | skb->pkt_type = PACKET_OUTGOING; |
| 408 | dn_rt_finish_output(skb, NULL, NULL); |
| 409 | return NET_RX_SUCCESS; |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * dn_return_long - Return a long packet to its sender |
| 414 | * @skb: The long format packet to return |
| 415 | * |
| 416 | */ |
| 417 | static int dn_return_long(struct sk_buff *skb) |
| 418 | { |
| 419 | struct dn_skb_cb *cb; |
| 420 | unsigned char *ptr; |
| 421 | unsigned char *src_addr, *dst_addr; |
| 422 | unsigned char tmp[ETH_ALEN]; |
| 423 | |
| 424 | /* Add back all headers */ |
| 425 | skb_push(skb, skb->data - skb->nh.raw); |
| 426 | |
| 427 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| 428 | return NET_RX_DROP; |
| 429 | |
| 430 | cb = DN_SKB_CB(skb); |
| 431 | /* Ignore packet length and point to flags */ |
| 432 | ptr = skb->data + 2; |
| 433 | |
| 434 | /* Skip padding */ |
| 435 | if (*ptr & DN_RT_F_PF) { |
| 436 | char padlen = (*ptr & ~DN_RT_F_PF); |
| 437 | ptr += padlen; |
| 438 | } |
| 439 | |
| 440 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| 441 | ptr += 2; |
| 442 | dst_addr = ptr; |
| 443 | ptr += 8; |
| 444 | src_addr = ptr; |
| 445 | ptr += 6; |
| 446 | *ptr = 0; /* Zero hop count */ |
| 447 | |
| 448 | /* Swap source and destination */ |
| 449 | memcpy(tmp, src_addr, ETH_ALEN); |
| 450 | memcpy(src_addr, dst_addr, ETH_ALEN); |
| 451 | memcpy(dst_addr, tmp, ETH_ALEN); |
| 452 | |
| 453 | skb->pkt_type = PACKET_OUTGOING; |
| 454 | dn_rt_finish_output(skb, dst_addr, src_addr); |
| 455 | return NET_RX_SUCCESS; |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * dn_route_rx_packet - Try and find a route for an incoming packet |
| 460 | * @skb: The packet to find a route for |
| 461 | * |
| 462 | * Returns: result of input function if route is found, error code otherwise |
| 463 | */ |
| 464 | static int dn_route_rx_packet(struct sk_buff *skb) |
| 465 | { |
| 466 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 467 | int err; |
| 468 | |
| 469 | if ((err = dn_route_input(skb)) == 0) |
| 470 | return dst_input(skb); |
| 471 | |
| 472 | if (decnet_debug_level & 4) { |
| 473 | char *devname = skb->dev ? skb->dev->name : "???"; |
| 474 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 475 | printk(KERN_DEBUG |
| 476 | "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 477 | (int)cb->rt_flags, devname, skb->len, |
| 478 | dn_ntohs(cb->src), dn_ntohs(cb->dst), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | err, skb->pkt_type); |
| 480 | } |
| 481 | |
| 482 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { |
| 483 | switch(cb->rt_flags & DN_RT_PKT_MSK) { |
| 484 | case DN_RT_PKT_SHORT: |
| 485 | return dn_return_short(skb); |
| 486 | case DN_RT_PKT_LONG: |
| 487 | return dn_return_long(skb); |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | kfree_skb(skb); |
| 492 | return NET_RX_DROP; |
| 493 | } |
| 494 | |
| 495 | static int dn_route_rx_long(struct sk_buff *skb) |
| 496 | { |
| 497 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 498 | unsigned char *ptr = skb->data; |
| 499 | |
| 500 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ |
| 501 | goto drop_it; |
| 502 | |
| 503 | skb_pull(skb, 20); |
| 504 | skb->h.raw = skb->data; |
| 505 | |
| 506 | /* Destination info */ |
| 507 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 508 | cb->dst = dn_eth2dn(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| 510 | goto drop_it; |
| 511 | ptr += 6; |
| 512 | |
| 513 | |
| 514 | /* Source info */ |
| 515 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 516 | cb->src = dn_eth2dn(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| 518 | goto drop_it; |
| 519 | ptr += 6; |
| 520 | /* Other junk */ |
| 521 | ptr++; |
| 522 | cb->hops = *ptr++; /* Visit Count */ |
| 523 | |
| 524 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); |
| 525 | |
| 526 | drop_it: |
| 527 | kfree_skb(skb); |
| 528 | return NET_RX_DROP; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | |
| 533 | static int dn_route_rx_short(struct sk_buff *skb) |
| 534 | { |
| 535 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 536 | unsigned char *ptr = skb->data; |
| 537 | |
| 538 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ |
| 539 | goto drop_it; |
| 540 | |
| 541 | skb_pull(skb, 5); |
| 542 | skb->h.raw = skb->data; |
| 543 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 544 | cb->dst = *(__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 546 | cb->src = *(__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | ptr += 2; |
| 548 | cb->hops = *ptr & 0x3f; |
| 549 | |
| 550 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); |
| 551 | |
| 552 | drop_it: |
| 553 | kfree_skb(skb); |
| 554 | return NET_RX_DROP; |
| 555 | } |
| 556 | |
| 557 | static int dn_route_discard(struct sk_buff *skb) |
| 558 | { |
| 559 | /* |
| 560 | * I know we drop the packet here, but thats considered success in |
| 561 | * this case |
| 562 | */ |
| 563 | kfree_skb(skb); |
| 564 | return NET_RX_SUCCESS; |
| 565 | } |
| 566 | |
| 567 | static int dn_route_ptp_hello(struct sk_buff *skb) |
| 568 | { |
| 569 | dn_dev_hello(skb); |
| 570 | dn_neigh_pointopoint_hello(skb); |
| 571 | return NET_RX_SUCCESS; |
| 572 | } |
| 573 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 574 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
| 576 | struct dn_skb_cb *cb; |
| 577 | unsigned char flags = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 578 | __u16 len = dn_ntohs(*(__le16 *)skb->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
| 580 | unsigned char padlen = 0; |
| 581 | |
| 582 | if (dn == NULL) |
| 583 | goto dump_it; |
| 584 | |
| 585 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 586 | goto out; |
| 587 | |
| 588 | if (!pskb_may_pull(skb, 3)) |
| 589 | goto dump_it; |
| 590 | |
| 591 | skb_pull(skb, 2); |
| 592 | |
| 593 | if (len > skb->len) |
| 594 | goto dump_it; |
| 595 | |
| 596 | skb_trim(skb, len); |
| 597 | |
| 598 | flags = *skb->data; |
| 599 | |
| 600 | cb = DN_SKB_CB(skb); |
| 601 | cb->stamp = jiffies; |
| 602 | cb->iif = dev->ifindex; |
| 603 | |
| 604 | /* |
| 605 | * If we have padding, remove it. |
| 606 | */ |
| 607 | if (flags & DN_RT_F_PF) { |
| 608 | padlen = flags & ~DN_RT_F_PF; |
| 609 | if (!pskb_may_pull(skb, padlen + 1)) |
| 610 | goto dump_it; |
| 611 | skb_pull(skb, padlen); |
| 612 | flags = *skb->data; |
| 613 | } |
| 614 | |
| 615 | skb->nh.raw = skb->data; |
| 616 | |
| 617 | /* |
| 618 | * Weed out future version DECnet |
| 619 | */ |
| 620 | if (flags & DN_RT_F_VER) |
| 621 | goto dump_it; |
| 622 | |
| 623 | cb->rt_flags = flags; |
| 624 | |
| 625 | if (decnet_debug_level & 1) |
| 626 | printk(KERN_DEBUG |
| 627 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
| 628 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
| 629 | padlen); |
| 630 | |
| 631 | if (flags & DN_RT_PKT_CNTL) { |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 632 | if (unlikely(skb_linearize(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | goto dump_it; |
| 634 | |
| 635 | switch(flags & DN_RT_CNTL_MSK) { |
| 636 | case DN_RT_PKT_INIT: |
| 637 | dn_dev_init_pkt(skb); |
| 638 | break; |
| 639 | case DN_RT_PKT_VERI: |
| 640 | dn_dev_veri_pkt(skb); |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | if (dn->parms.state != DN_DEV_S_RU) |
| 645 | goto dump_it; |
| 646 | |
| 647 | switch(flags & DN_RT_CNTL_MSK) { |
| 648 | case DN_RT_PKT_HELO: |
| 649 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); |
| 650 | |
| 651 | case DN_RT_PKT_L1RT: |
| 652 | case DN_RT_PKT_L2RT: |
| 653 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); |
| 654 | case DN_RT_PKT_ERTH: |
| 655 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); |
| 656 | |
| 657 | case DN_RT_PKT_EEDH: |
| 658 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello); |
| 659 | } |
| 660 | } else { |
| 661 | if (dn->parms.state != DN_DEV_S_RU) |
| 662 | goto dump_it; |
| 663 | |
| 664 | skb_pull(skb, 1); /* Pull flags */ |
| 665 | |
| 666 | switch(flags & DN_RT_PKT_MSK) { |
| 667 | case DN_RT_PKT_LONG: |
| 668 | return dn_route_rx_long(skb); |
| 669 | case DN_RT_PKT_SHORT: |
| 670 | return dn_route_rx_short(skb); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | dump_it: |
| 675 | kfree_skb(skb); |
| 676 | out: |
| 677 | return NET_RX_DROP; |
| 678 | } |
| 679 | |
| 680 | static int dn_output(struct sk_buff *skb) |
| 681 | { |
| 682 | struct dst_entry *dst = skb->dst; |
| 683 | struct dn_route *rt = (struct dn_route *)dst; |
| 684 | struct net_device *dev = dst->dev; |
| 685 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 686 | struct neighbour *neigh; |
| 687 | |
| 688 | int err = -EINVAL; |
| 689 | |
| 690 | if ((neigh = dst->neighbour) == NULL) |
| 691 | goto error; |
| 692 | |
| 693 | skb->dev = dev; |
| 694 | |
| 695 | cb->src = rt->rt_saddr; |
| 696 | cb->dst = rt->rt_daddr; |
| 697 | |
| 698 | /* |
| 699 | * Always set the Intra-Ethernet bit on all outgoing packets |
| 700 | * originated on this node. Only valid flag from upper layers |
| 701 | * is return-to-sender-requested. Set hop count to 0 too. |
| 702 | */ |
| 703 | cb->rt_flags &= ~DN_RT_F_RQR; |
| 704 | cb->rt_flags |= DN_RT_F_IE; |
| 705 | cb->hops = 0; |
| 706 | |
| 707 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); |
| 708 | |
| 709 | error: |
| 710 | if (net_ratelimit()) |
| 711 | printk(KERN_DEBUG "dn_output: This should not happen\n"); |
| 712 | |
| 713 | kfree_skb(skb); |
| 714 | |
| 715 | return err; |
| 716 | } |
| 717 | |
| 718 | static int dn_forward(struct sk_buff *skb) |
| 719 | { |
| 720 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 721 | struct dst_entry *dst = skb->dst; |
| 722 | struct dn_dev *dn_db = dst->dev->dn_ptr; |
| 723 | struct dn_route *rt; |
| 724 | struct neighbour *neigh = dst->neighbour; |
| 725 | int header_len; |
| 726 | #ifdef CONFIG_NETFILTER |
| 727 | struct net_device *dev = skb->dev; |
| 728 | #endif |
| 729 | |
| 730 | if (skb->pkt_type != PACKET_HOST) |
| 731 | goto drop; |
| 732 | |
| 733 | /* Ensure that we have enough space for headers */ |
| 734 | rt = (struct dn_route *)skb->dst; |
| 735 | header_len = dn_db->use_long ? 21 : 6; |
| 736 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) |
| 737 | goto drop; |
| 738 | |
| 739 | /* |
| 740 | * Hop count exceeded. |
| 741 | */ |
| 742 | if (++cb->hops > 30) |
| 743 | goto drop; |
| 744 | |
| 745 | skb->dev = rt->u.dst.dev; |
| 746 | |
| 747 | /* |
| 748 | * If packet goes out same interface it came in on, then set |
| 749 | * the Intra-Ethernet bit. This has no effect for short |
| 750 | * packets, so we don't need to test for them here. |
| 751 | */ |
| 752 | cb->rt_flags &= ~DN_RT_F_IE; |
| 753 | if (rt->rt_flags & RTCF_DOREDIRECT) |
| 754 | cb->rt_flags |= DN_RT_F_IE; |
| 755 | |
| 756 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); |
| 757 | |
| 758 | drop: |
| 759 | kfree_skb(skb); |
| 760 | return NET_RX_DROP; |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * Drop packet. This is used for endnodes and for |
| 765 | * when we should not be forwarding packets from |
| 766 | * this dest. |
| 767 | */ |
| 768 | static int dn_blackhole(struct sk_buff *skb) |
| 769 | { |
| 770 | kfree_skb(skb); |
| 771 | return NET_RX_DROP; |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Used to catch bugs. This should never normally get |
| 776 | * called. |
| 777 | */ |
| 778 | static int dn_rt_bug(struct sk_buff *skb) |
| 779 | { |
| 780 | if (net_ratelimit()) { |
| 781 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 782 | |
| 783 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 784 | dn_ntohs(cb->src), dn_ntohs(cb->dst)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | kfree_skb(skb); |
| 788 | |
| 789 | return NET_RX_BAD; |
| 790 | } |
| 791 | |
| 792 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
| 793 | { |
| 794 | struct dn_fib_info *fi = res->fi; |
| 795 | struct net_device *dev = rt->u.dst.dev; |
| 796 | struct neighbour *n; |
| 797 | unsigned mss; |
| 798 | |
| 799 | if (fi) { |
| 800 | if (DN_FIB_RES_GW(*res) && |
| 801 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| 802 | rt->rt_gateway = DN_FIB_RES_GW(*res); |
| 803 | memcpy(rt->u.dst.metrics, fi->fib_metrics, |
| 804 | sizeof(rt->u.dst.metrics)); |
| 805 | } |
| 806 | rt->rt_type = res->type; |
| 807 | |
| 808 | if (dev != NULL && rt->u.dst.neighbour == NULL) { |
| 809 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
| 810 | if (IS_ERR(n)) |
| 811 | return PTR_ERR(n); |
| 812 | rt->u.dst.neighbour = n; |
| 813 | } |
| 814 | |
| 815 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || |
| 816 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) |
| 817 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
| 818 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); |
| 819 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || |
| 820 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) |
| 821 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; |
| 822 | return 0; |
| 823 | } |
| 824 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 825 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
| 827 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); |
| 828 | int match = 16; |
| 829 | while(tmp) { |
| 830 | tmp >>= 1; |
| 831 | match--; |
| 832 | } |
| 833 | return match; |
| 834 | } |
| 835 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 836 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 838 | __le16 saddr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct dn_dev *dn_db = dev->dn_ptr; |
| 840 | struct dn_ifaddr *ifa; |
| 841 | int best_match = 0; |
| 842 | int ret; |
| 843 | |
| 844 | read_lock(&dev_base_lock); |
| 845 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { |
| 846 | if (ifa->ifa_scope > scope) |
| 847 | continue; |
| 848 | if (!daddr) { |
| 849 | saddr = ifa->ifa_local; |
| 850 | break; |
| 851 | } |
| 852 | ret = dn_match_addr(daddr, ifa->ifa_local); |
| 853 | if (ret > best_match) |
| 854 | saddr = ifa->ifa_local; |
| 855 | if (best_match == 0) |
| 856 | saddr = ifa->ifa_local; |
| 857 | } |
| 858 | read_unlock(&dev_base_lock); |
| 859 | |
| 860 | return saddr; |
| 861 | } |
| 862 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 863 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | { |
| 865 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); |
| 866 | } |
| 867 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 868 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 870 | __le16 mask = dnet_make_mask(res->prefixlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
| 872 | } |
| 873 | |
| 874 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) |
| 875 | { |
| 876 | struct flowi fl = { .nl_u = { .dn_u = |
| 877 | { .daddr = oldflp->fld_dst, |
| 878 | .saddr = oldflp->fld_src, |
| 879 | .scope = RT_SCOPE_UNIVERSE, |
| 880 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
| 881 | .fwmark = oldflp->fld_fwmark |
| 882 | #endif |
| 883 | } }, |
| 884 | .iif = loopback_dev.ifindex, |
| 885 | .oif = oldflp->oif }; |
| 886 | struct dn_route *rt = NULL; |
| 887 | struct net_device *dev_out = NULL; |
| 888 | struct neighbour *neigh = NULL; |
| 889 | unsigned hash; |
| 890 | unsigned flags = 0; |
| 891 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; |
| 892 | int err; |
| 893 | int free_res = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 894 | __le16 gateway = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | if (decnet_debug_level & 16) |
| 897 | printk(KERN_DEBUG |
| 898 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 899 | " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), |
| 900 | dn_ntohs(oldflp->fld_src), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif); |
| 902 | |
| 903 | /* If we have an output interface, verify its a DECnet device */ |
| 904 | if (oldflp->oif) { |
| 905 | dev_out = dev_get_by_index(oldflp->oif); |
| 906 | err = -ENODEV; |
| 907 | if (dev_out && dev_out->dn_ptr == NULL) { |
| 908 | dev_put(dev_out); |
| 909 | dev_out = NULL; |
| 910 | } |
| 911 | if (dev_out == NULL) |
| 912 | goto out; |
| 913 | } |
| 914 | |
| 915 | /* If we have a source address, verify that its a local address */ |
| 916 | if (oldflp->fld_src) { |
| 917 | err = -EADDRNOTAVAIL; |
| 918 | |
| 919 | if (dev_out) { |
| 920 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) |
| 921 | goto source_ok; |
| 922 | dev_put(dev_out); |
| 923 | goto out; |
| 924 | } |
| 925 | read_lock(&dev_base_lock); |
| 926 | for(dev_out = dev_base; dev_out; dev_out = dev_out->next) { |
| 927 | if (!dev_out->dn_ptr) |
| 928 | continue; |
Patrick Caulfield | 9bbf28a1 | 2006-08-02 14:14:44 -0700 | [diff] [blame] | 929 | if (!dn_dev_islocal(dev_out, oldflp->fld_src)) |
| 930 | continue; |
| 931 | if ((dev_out->flags & IFF_LOOPBACK) && |
| 932 | oldflp->fld_dst && |
| 933 | !dn_dev_islocal(dev_out, oldflp->fld_dst)) |
| 934 | continue; |
| 935 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | } |
| 937 | read_unlock(&dev_base_lock); |
| 938 | if (dev_out == NULL) |
| 939 | goto out; |
| 940 | dev_hold(dev_out); |
| 941 | source_ok: |
| 942 | ; |
| 943 | } |
| 944 | |
| 945 | /* No destination? Assume its local */ |
| 946 | if (!fl.fld_dst) { |
| 947 | fl.fld_dst = fl.fld_src; |
| 948 | |
| 949 | err = -EADDRNOTAVAIL; |
| 950 | if (dev_out) |
| 951 | dev_put(dev_out); |
| 952 | dev_out = &loopback_dev; |
| 953 | dev_hold(dev_out); |
| 954 | if (!fl.fld_dst) { |
| 955 | fl.fld_dst = |
| 956 | fl.fld_src = dnet_select_source(dev_out, 0, |
| 957 | RT_SCOPE_HOST); |
| 958 | if (!fl.fld_dst) |
| 959 | goto out; |
| 960 | } |
| 961 | fl.oif = loopback_dev.ifindex; |
| 962 | res.type = RTN_LOCAL; |
| 963 | goto make_route; |
| 964 | } |
| 965 | |
| 966 | if (decnet_debug_level & 16) |
| 967 | printk(KERN_DEBUG |
| 968 | "dn_route_output_slow: initial checks complete." |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 969 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
| 970 | dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src), |
| 971 | fl.oif, try_hard); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
| 973 | /* |
| 974 | * N.B. If the kernel is compiled without router support then |
| 975 | * dn_fib_lookup() will evaluate to non-zero so this if () block |
| 976 | * will always be executed. |
| 977 | */ |
| 978 | err = -ESRCH; |
| 979 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { |
| 980 | struct dn_dev *dn_db; |
| 981 | if (err != -ESRCH) |
| 982 | goto out; |
| 983 | /* |
| 984 | * Here the fallback is basically the standard algorithm for |
| 985 | * routing in endnodes which is described in the DECnet routing |
| 986 | * docs |
| 987 | * |
| 988 | * If we are not trying hard, look in neighbour cache. |
| 989 | * The result is tested to ensure that if a specific output |
| 990 | * device/source address was requested, then we honour that |
| 991 | * here |
| 992 | */ |
| 993 | if (!try_hard) { |
| 994 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); |
| 995 | if (neigh) { |
| 996 | if ((oldflp->oif && |
| 997 | (neigh->dev->ifindex != oldflp->oif)) || |
| 998 | (oldflp->fld_src && |
| 999 | (!dn_dev_islocal(neigh->dev, |
| 1000 | oldflp->fld_src)))) { |
| 1001 | neigh_release(neigh); |
| 1002 | neigh = NULL; |
| 1003 | } else { |
| 1004 | if (dev_out) |
| 1005 | dev_put(dev_out); |
| 1006 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { |
| 1007 | dev_out = &loopback_dev; |
| 1008 | res.type = RTN_LOCAL; |
| 1009 | } else { |
| 1010 | dev_out = neigh->dev; |
| 1011 | } |
| 1012 | dev_hold(dev_out); |
| 1013 | goto select_source; |
| 1014 | } |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | /* Not there? Perhaps its a local address */ |
| 1019 | if (dev_out == NULL) |
| 1020 | dev_out = dn_dev_get_default(); |
| 1021 | err = -ENODEV; |
| 1022 | if (dev_out == NULL) |
| 1023 | goto out; |
| 1024 | dn_db = dev_out->dn_ptr; |
| 1025 | /* Possible improvement - check all devices for local addr */ |
| 1026 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { |
| 1027 | dev_put(dev_out); |
| 1028 | dev_out = &loopback_dev; |
| 1029 | dev_hold(dev_out); |
| 1030 | res.type = RTN_LOCAL; |
| 1031 | goto select_source; |
| 1032 | } |
| 1033 | /* Not local either.... try sending it to the default router */ |
| 1034 | neigh = neigh_clone(dn_db->router); |
| 1035 | BUG_ON(neigh && neigh->dev != dev_out); |
| 1036 | |
| 1037 | /* Ok then, we assume its directly connected and move on */ |
| 1038 | select_source: |
| 1039 | if (neigh) |
| 1040 | gateway = ((struct dn_neigh *)neigh)->addr; |
| 1041 | if (gateway == 0) |
| 1042 | gateway = fl.fld_dst; |
| 1043 | if (fl.fld_src == 0) { |
| 1044 | fl.fld_src = dnet_select_source(dev_out, gateway, |
| 1045 | res.type == RTN_LOCAL ? |
| 1046 | RT_SCOPE_HOST : |
| 1047 | RT_SCOPE_LINK); |
| 1048 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) |
| 1049 | goto e_addr; |
| 1050 | } |
| 1051 | fl.oif = dev_out->ifindex; |
| 1052 | goto make_route; |
| 1053 | } |
| 1054 | free_res = 1; |
| 1055 | |
| 1056 | if (res.type == RTN_NAT) |
| 1057 | goto e_inval; |
| 1058 | |
| 1059 | if (res.type == RTN_LOCAL) { |
| 1060 | if (!fl.fld_src) |
| 1061 | fl.fld_src = fl.fld_dst; |
| 1062 | if (dev_out) |
| 1063 | dev_put(dev_out); |
| 1064 | dev_out = &loopback_dev; |
| 1065 | dev_hold(dev_out); |
| 1066 | fl.oif = dev_out->ifindex; |
| 1067 | if (res.fi) |
| 1068 | dn_fib_info_put(res.fi); |
| 1069 | res.fi = NULL; |
| 1070 | goto make_route; |
| 1071 | } |
| 1072 | |
| 1073 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 1074 | dn_fib_select_multipath(&fl, &res); |
| 1075 | |
| 1076 | /* |
| 1077 | * We could add some logic to deal with default routes here and |
| 1078 | * get rid of some of the special casing above. |
| 1079 | */ |
| 1080 | |
| 1081 | if (!fl.fld_src) |
| 1082 | fl.fld_src = DN_FIB_RES_PREFSRC(res); |
| 1083 | |
| 1084 | if (dev_out) |
| 1085 | dev_put(dev_out); |
| 1086 | dev_out = DN_FIB_RES_DEV(res); |
| 1087 | dev_hold(dev_out); |
| 1088 | fl.oif = dev_out->ifindex; |
| 1089 | gateway = DN_FIB_RES_GW(res); |
| 1090 | |
| 1091 | make_route: |
| 1092 | if (dev_out->flags & IFF_LOOPBACK) |
| 1093 | flags |= RTCF_LOCAL; |
| 1094 | |
| 1095 | rt = dst_alloc(&dn_dst_ops); |
| 1096 | if (rt == NULL) |
| 1097 | goto e_nobufs; |
| 1098 | |
| 1099 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1100 | rt->u.dst.flags = DST_HOST; |
| 1101 | |
| 1102 | rt->fl.fld_src = oldflp->fld_src; |
| 1103 | rt->fl.fld_dst = oldflp->fld_dst; |
| 1104 | rt->fl.oif = oldflp->oif; |
| 1105 | rt->fl.iif = 0; |
| 1106 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
| 1107 | rt->fl.fld_fwmark = oldflp->fld_fwmark; |
| 1108 | #endif |
| 1109 | |
| 1110 | rt->rt_saddr = fl.fld_src; |
| 1111 | rt->rt_daddr = fl.fld_dst; |
| 1112 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; |
| 1113 | rt->rt_local_src = fl.fld_src; |
| 1114 | |
| 1115 | rt->rt_dst_map = fl.fld_dst; |
| 1116 | rt->rt_src_map = fl.fld_src; |
| 1117 | |
| 1118 | rt->u.dst.dev = dev_out; |
| 1119 | dev_hold(dev_out); |
| 1120 | rt->u.dst.neighbour = neigh; |
| 1121 | neigh = NULL; |
| 1122 | |
| 1123 | rt->u.dst.lastuse = jiffies; |
| 1124 | rt->u.dst.output = dn_output; |
| 1125 | rt->u.dst.input = dn_rt_bug; |
| 1126 | rt->rt_flags = flags; |
| 1127 | if (flags & RTCF_LOCAL) |
| 1128 | rt->u.dst.input = dn_nsp_rx; |
| 1129 | |
| 1130 | err = dn_rt_set_next_hop(rt, &res); |
| 1131 | if (err) |
| 1132 | goto e_neighbour; |
| 1133 | |
| 1134 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
| 1135 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
| 1136 | |
| 1137 | done: |
| 1138 | if (neigh) |
| 1139 | neigh_release(neigh); |
| 1140 | if (free_res) |
| 1141 | dn_fib_res_put(&res); |
| 1142 | if (dev_out) |
| 1143 | dev_put(dev_out); |
| 1144 | out: |
| 1145 | return err; |
| 1146 | |
| 1147 | e_addr: |
| 1148 | err = -EADDRNOTAVAIL; |
| 1149 | goto done; |
| 1150 | e_inval: |
| 1151 | err = -EINVAL; |
| 1152 | goto done; |
| 1153 | e_nobufs: |
| 1154 | err = -ENOBUFS; |
| 1155 | goto done; |
| 1156 | e_neighbour: |
| 1157 | dst_free(&rt->u.dst); |
| 1158 | goto e_nobufs; |
| 1159 | } |
| 1160 | |
| 1161 | |
| 1162 | /* |
| 1163 | * N.B. The flags may be moved into the flowi at some future stage. |
| 1164 | */ |
| 1165 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) |
| 1166 | { |
| 1167 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); |
| 1168 | struct dn_route *rt = NULL; |
| 1169 | |
| 1170 | if (!(flags & MSG_TRYHARD)) { |
| 1171 | rcu_read_lock_bh(); |
| 1172 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; |
| 1173 | rt = rcu_dereference(rt->u.rt_next)) { |
| 1174 | if ((flp->fld_dst == rt->fl.fld_dst) && |
| 1175 | (flp->fld_src == rt->fl.fld_src) && |
| 1176 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
| 1177 | (flp->fld_fwmark == rt->fl.fld_fwmark) && |
| 1178 | #endif |
| 1179 | (rt->fl.iif == 0) && |
| 1180 | (rt->fl.oif == flp->oif)) { |
| 1181 | rt->u.dst.lastuse = jiffies; |
| 1182 | dst_hold(&rt->u.dst); |
| 1183 | rt->u.dst.__use++; |
| 1184 | rcu_read_unlock_bh(); |
| 1185 | *pprt = &rt->u.dst; |
| 1186 | return 0; |
| 1187 | } |
| 1188 | } |
| 1189 | rcu_read_unlock_bh(); |
| 1190 | } |
| 1191 | |
| 1192 | return dn_route_output_slow(pprt, flp, flags); |
| 1193 | } |
| 1194 | |
| 1195 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) |
| 1196 | { |
| 1197 | int err; |
| 1198 | |
| 1199 | err = __dn_route_output_key(pprt, flp, flags); |
| 1200 | if (err == 0 && flp->proto) { |
| 1201 | err = xfrm_lookup(pprt, flp, NULL, 0); |
| 1202 | } |
| 1203 | return err; |
| 1204 | } |
| 1205 | |
| 1206 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) |
| 1207 | { |
| 1208 | int err; |
| 1209 | |
| 1210 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); |
| 1211 | if (err == 0 && fl->proto) { |
| 1212 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); |
| 1213 | } |
| 1214 | return err; |
| 1215 | } |
| 1216 | |
| 1217 | static int dn_route_input_slow(struct sk_buff *skb) |
| 1218 | { |
| 1219 | struct dn_route *rt = NULL; |
| 1220 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 1221 | struct net_device *in_dev = skb->dev; |
| 1222 | struct net_device *out_dev = NULL; |
| 1223 | struct dn_dev *dn_db; |
| 1224 | struct neighbour *neigh = NULL; |
| 1225 | unsigned hash; |
| 1226 | int flags = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 1227 | __le16 gateway = 0; |
| 1228 | __le16 local_src = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | struct flowi fl = { .nl_u = { .dn_u = |
| 1230 | { .daddr = cb->dst, |
| 1231 | .saddr = cb->src, |
| 1232 | .scope = RT_SCOPE_UNIVERSE, |
| 1233 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
| 1234 | .fwmark = skb->nfmark |
| 1235 | #endif |
| 1236 | } }, |
| 1237 | .iif = skb->dev->ifindex }; |
| 1238 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
| 1239 | int err = -EINVAL; |
| 1240 | int free_res = 0; |
| 1241 | |
| 1242 | dev_hold(in_dev); |
| 1243 | |
| 1244 | if ((dn_db = in_dev->dn_ptr) == NULL) |
| 1245 | goto out; |
| 1246 | |
| 1247 | /* Zero source addresses are not allowed */ |
| 1248 | if (fl.fld_src == 0) |
| 1249 | goto out; |
| 1250 | |
| 1251 | /* |
| 1252 | * In this case we've just received a packet from a source |
| 1253 | * outside ourselves pretending to come from us. We don't |
| 1254 | * allow it any further to prevent routing loops, spoofing and |
| 1255 | * other nasties. Loopback packets already have the dst attached |
| 1256 | * so this only affects packets which have originated elsewhere. |
| 1257 | */ |
| 1258 | err = -ENOTUNIQ; |
| 1259 | if (dn_dev_islocal(in_dev, cb->src)) |
| 1260 | goto out; |
| 1261 | |
| 1262 | err = dn_fib_lookup(&fl, &res); |
| 1263 | if (err) { |
| 1264 | if (err != -ESRCH) |
| 1265 | goto out; |
| 1266 | /* |
| 1267 | * Is the destination us ? |
| 1268 | */ |
| 1269 | if (!dn_dev_islocal(in_dev, cb->dst)) |
| 1270 | goto e_inval; |
| 1271 | |
| 1272 | res.type = RTN_LOCAL; |
| 1273 | flags |= RTCF_DIRECTSRC; |
| 1274 | } else { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 1275 | __le16 src_map = fl.fld_src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | free_res = 1; |
| 1277 | |
| 1278 | out_dev = DN_FIB_RES_DEV(res); |
| 1279 | if (out_dev == NULL) { |
| 1280 | if (net_ratelimit()) |
| 1281 | printk(KERN_CRIT "Bug in dn_route_input_slow() " |
| 1282 | "No output device\n"); |
| 1283 | goto e_inval; |
| 1284 | } |
| 1285 | dev_hold(out_dev); |
| 1286 | |
| 1287 | if (res.r) |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 1288 | src_map = fl.fld_src; /* no NAT support for now */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
| 1290 | gateway = DN_FIB_RES_GW(res); |
| 1291 | if (res.type == RTN_NAT) { |
| 1292 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); |
| 1293 | dn_fib_res_put(&res); |
| 1294 | free_res = 0; |
| 1295 | if (dn_fib_lookup(&fl, &res)) |
| 1296 | goto e_inval; |
| 1297 | free_res = 1; |
| 1298 | if (res.type != RTN_UNICAST) |
| 1299 | goto e_inval; |
| 1300 | flags |= RTCF_DNAT; |
| 1301 | gateway = fl.fld_dst; |
| 1302 | } |
| 1303 | fl.fld_src = src_map; |
| 1304 | } |
| 1305 | |
| 1306 | switch(res.type) { |
| 1307 | case RTN_UNICAST: |
| 1308 | /* |
| 1309 | * Forwarding check here, we only check for forwarding |
| 1310 | * being turned off, if you want to only forward intra |
| 1311 | * area, its up to you to set the routing tables up |
| 1312 | * correctly. |
| 1313 | */ |
| 1314 | if (dn_db->parms.forwarding == 0) |
| 1315 | goto e_inval; |
| 1316 | |
| 1317 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 1318 | dn_fib_select_multipath(&fl, &res); |
| 1319 | |
| 1320 | /* |
| 1321 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
| 1322 | * flag as a hint to set the intra-ethernet bit when |
| 1323 | * forwarding. If we've got NAT in operation, we don't do |
| 1324 | * this optimisation. |
| 1325 | */ |
| 1326 | if (out_dev == in_dev && !(flags & RTCF_NAT)) |
| 1327 | flags |= RTCF_DOREDIRECT; |
| 1328 | |
| 1329 | local_src = DN_FIB_RES_PREFSRC(res); |
| 1330 | |
| 1331 | case RTN_BLACKHOLE: |
| 1332 | case RTN_UNREACHABLE: |
| 1333 | break; |
| 1334 | case RTN_LOCAL: |
| 1335 | flags |= RTCF_LOCAL; |
| 1336 | fl.fld_src = cb->dst; |
| 1337 | fl.fld_dst = cb->src; |
| 1338 | |
| 1339 | /* Routing tables gave us a gateway */ |
| 1340 | if (gateway) |
| 1341 | goto make_route; |
| 1342 | |
| 1343 | /* Packet was intra-ethernet, so we know its on-link */ |
| 1344 | if (cb->rt_flags | DN_RT_F_IE) { |
| 1345 | gateway = cb->src; |
| 1346 | flags |= RTCF_DIRECTSRC; |
| 1347 | goto make_route; |
| 1348 | } |
| 1349 | |
| 1350 | /* Use the default router if there is one */ |
| 1351 | neigh = neigh_clone(dn_db->router); |
| 1352 | if (neigh) { |
| 1353 | gateway = ((struct dn_neigh *)neigh)->addr; |
| 1354 | goto make_route; |
| 1355 | } |
| 1356 | |
| 1357 | /* Close eyes and pray */ |
| 1358 | gateway = cb->src; |
| 1359 | flags |= RTCF_DIRECTSRC; |
| 1360 | goto make_route; |
| 1361 | default: |
| 1362 | goto e_inval; |
| 1363 | } |
| 1364 | |
| 1365 | make_route: |
| 1366 | rt = dst_alloc(&dn_dst_ops); |
| 1367 | if (rt == NULL) |
| 1368 | goto e_nobufs; |
| 1369 | |
| 1370 | rt->rt_saddr = fl.fld_src; |
| 1371 | rt->rt_daddr = fl.fld_dst; |
| 1372 | rt->rt_gateway = fl.fld_dst; |
| 1373 | if (gateway) |
| 1374 | rt->rt_gateway = gateway; |
| 1375 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; |
| 1376 | |
| 1377 | rt->rt_dst_map = fl.fld_dst; |
| 1378 | rt->rt_src_map = fl.fld_src; |
| 1379 | |
| 1380 | rt->fl.fld_src = cb->src; |
| 1381 | rt->fl.fld_dst = cb->dst; |
| 1382 | rt->fl.oif = 0; |
| 1383 | rt->fl.iif = in_dev->ifindex; |
| 1384 | rt->fl.fld_fwmark = fl.fld_fwmark; |
| 1385 | |
| 1386 | rt->u.dst.flags = DST_HOST; |
| 1387 | rt->u.dst.neighbour = neigh; |
| 1388 | rt->u.dst.dev = out_dev; |
| 1389 | rt->u.dst.lastuse = jiffies; |
| 1390 | rt->u.dst.output = dn_rt_bug; |
| 1391 | switch(res.type) { |
| 1392 | case RTN_UNICAST: |
| 1393 | rt->u.dst.input = dn_forward; |
| 1394 | break; |
| 1395 | case RTN_LOCAL: |
| 1396 | rt->u.dst.output = dn_output; |
| 1397 | rt->u.dst.input = dn_nsp_rx; |
| 1398 | rt->u.dst.dev = in_dev; |
| 1399 | flags |= RTCF_LOCAL; |
| 1400 | break; |
| 1401 | default: |
| 1402 | case RTN_UNREACHABLE: |
| 1403 | case RTN_BLACKHOLE: |
| 1404 | rt->u.dst.input = dn_blackhole; |
| 1405 | } |
| 1406 | rt->rt_flags = flags; |
| 1407 | if (rt->u.dst.dev) |
| 1408 | dev_hold(rt->u.dst.dev); |
| 1409 | |
| 1410 | err = dn_rt_set_next_hop(rt, &res); |
| 1411 | if (err) |
| 1412 | goto e_neighbour; |
| 1413 | |
| 1414 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
| 1415 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); |
| 1416 | |
| 1417 | done: |
| 1418 | if (neigh) |
| 1419 | neigh_release(neigh); |
| 1420 | if (free_res) |
| 1421 | dn_fib_res_put(&res); |
| 1422 | dev_put(in_dev); |
| 1423 | if (out_dev) |
| 1424 | dev_put(out_dev); |
| 1425 | out: |
| 1426 | return err; |
| 1427 | |
| 1428 | e_inval: |
| 1429 | err = -EINVAL; |
| 1430 | goto done; |
| 1431 | |
| 1432 | e_nobufs: |
| 1433 | err = -ENOBUFS; |
| 1434 | goto done; |
| 1435 | |
| 1436 | e_neighbour: |
| 1437 | dst_free(&rt->u.dst); |
| 1438 | goto done; |
| 1439 | } |
| 1440 | |
| 1441 | int dn_route_input(struct sk_buff *skb) |
| 1442 | { |
| 1443 | struct dn_route *rt; |
| 1444 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 1445 | unsigned hash = dn_hash(cb->src, cb->dst); |
| 1446 | |
| 1447 | if (skb->dst) |
| 1448 | return 0; |
| 1449 | |
| 1450 | rcu_read_lock(); |
| 1451 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; |
| 1452 | rt = rcu_dereference(rt->u.rt_next)) { |
| 1453 | if ((rt->fl.fld_src == cb->src) && |
| 1454 | (rt->fl.fld_dst == cb->dst) && |
| 1455 | (rt->fl.oif == 0) && |
| 1456 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
| 1457 | (rt->fl.fld_fwmark == skb->nfmark) && |
| 1458 | #endif |
| 1459 | (rt->fl.iif == cb->iif)) { |
| 1460 | rt->u.dst.lastuse = jiffies; |
| 1461 | dst_hold(&rt->u.dst); |
| 1462 | rt->u.dst.__use++; |
| 1463 | rcu_read_unlock(); |
| 1464 | skb->dst = (struct dst_entry *)rt; |
| 1465 | return 0; |
| 1466 | } |
| 1467 | } |
| 1468 | rcu_read_unlock(); |
| 1469 | |
| 1470 | return dn_route_input_slow(skb); |
| 1471 | } |
| 1472 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1473 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 1474 | int event, int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | { |
| 1476 | struct dn_route *rt = (struct dn_route *)skb->dst; |
| 1477 | struct rtmsg *r; |
| 1478 | struct nlmsghdr *nlh; |
| 1479 | unsigned char *b = skb->tail; |
| 1480 | struct rta_cacheinfo ci; |
| 1481 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1482 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | r = NLMSG_DATA(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | r->rtm_family = AF_DECnet; |
| 1485 | r->rtm_dst_len = 16; |
| 1486 | r->rtm_src_len = 0; |
| 1487 | r->rtm_tos = 0; |
| 1488 | r->rtm_table = RT_TABLE_MAIN; |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 1489 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | r->rtm_type = rt->rt_type; |
| 1491 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 1492 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 1493 | r->rtm_protocol = RTPROT_UNSPEC; |
| 1494 | if (rt->rt_flags & RTCF_NOTIFY) |
| 1495 | r->rtm_flags |= RTM_F_NOTIFY; |
| 1496 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); |
| 1497 | if (rt->fl.fld_src) { |
| 1498 | r->rtm_src_len = 16; |
| 1499 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); |
| 1500 | } |
| 1501 | if (rt->u.dst.dev) |
| 1502 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); |
| 1503 | /* |
| 1504 | * Note to self - change this if input routes reverse direction when |
| 1505 | * they deal only with inputs and not with replies like they do |
| 1506 | * currently. |
| 1507 | */ |
| 1508 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); |
| 1509 | if (rt->rt_daddr != rt->rt_gateway) |
| 1510 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); |
| 1511 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
| 1512 | goto rtattr_failure; |
| 1513 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); |
| 1514 | ci.rta_used = rt->u.dst.__use; |
| 1515 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); |
| 1516 | if (rt->u.dst.expires) |
| 1517 | ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies); |
| 1518 | else |
| 1519 | ci.rta_expires = 0; |
| 1520 | ci.rta_error = rt->u.dst.error; |
| 1521 | ci.rta_id = ci.rta_ts = ci.rta_tsage = 0; |
| 1522 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); |
| 1523 | if (rt->fl.iif) |
| 1524 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); |
| 1525 | |
| 1526 | nlh->nlmsg_len = skb->tail - b; |
| 1527 | return skb->len; |
| 1528 | |
| 1529 | nlmsg_failure: |
| 1530 | rtattr_failure: |
| 1531 | skb_trim(skb, b - skb->data); |
| 1532 | return -1; |
| 1533 | } |
| 1534 | |
| 1535 | /* |
| 1536 | * This is called by both endnodes and routers now. |
| 1537 | */ |
| 1538 | int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
| 1539 | { |
| 1540 | struct rtattr **rta = arg; |
| 1541 | struct rtmsg *rtm = NLMSG_DATA(nlh); |
| 1542 | struct dn_route *rt = NULL; |
| 1543 | struct dn_skb_cb *cb; |
| 1544 | int err; |
| 1545 | struct sk_buff *skb; |
| 1546 | struct flowi fl; |
| 1547 | |
| 1548 | memset(&fl, 0, sizeof(fl)); |
| 1549 | fl.proto = DNPROTO_NSP; |
| 1550 | |
| 1551 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1552 | if (skb == NULL) |
| 1553 | return -ENOBUFS; |
| 1554 | skb->mac.raw = skb->data; |
| 1555 | cb = DN_SKB_CB(skb); |
| 1556 | |
| 1557 | if (rta[RTA_SRC-1]) |
| 1558 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); |
| 1559 | if (rta[RTA_DST-1]) |
| 1560 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); |
| 1561 | if (rta[RTA_IIF-1]) |
| 1562 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
| 1563 | |
| 1564 | if (fl.iif) { |
| 1565 | struct net_device *dev; |
| 1566 | if ((dev = dev_get_by_index(fl.iif)) == NULL) { |
| 1567 | kfree_skb(skb); |
| 1568 | return -ENODEV; |
| 1569 | } |
| 1570 | if (!dev->dn_ptr) { |
| 1571 | dev_put(dev); |
| 1572 | kfree_skb(skb); |
| 1573 | return -ENODEV; |
| 1574 | } |
| 1575 | skb->protocol = __constant_htons(ETH_P_DNA_RT); |
| 1576 | skb->dev = dev; |
| 1577 | cb->src = fl.fld_src; |
| 1578 | cb->dst = fl.fld_dst; |
| 1579 | local_bh_disable(); |
| 1580 | err = dn_route_input(skb); |
| 1581 | local_bh_enable(); |
| 1582 | memset(cb, 0, sizeof(struct dn_skb_cb)); |
| 1583 | rt = (struct dn_route *)skb->dst; |
| 1584 | if (!err && -rt->u.dst.error) |
| 1585 | err = rt->u.dst.error; |
| 1586 | } else { |
| 1587 | int oif = 0; |
| 1588 | if (rta[RTA_OIF - 1]) |
| 1589 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); |
| 1590 | fl.oif = oif; |
| 1591 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); |
| 1592 | } |
| 1593 | |
| 1594 | if (skb->dev) |
| 1595 | dev_put(skb->dev); |
| 1596 | skb->dev = NULL; |
| 1597 | if (err) |
| 1598 | goto out_free; |
| 1599 | skb->dst = &rt->u.dst; |
| 1600 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 1601 | rt->rt_flags |= RTCF_NOTIFY; |
| 1602 | |
| 1603 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; |
| 1604 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1605 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
| 1607 | if (err == 0) |
| 1608 | goto out_free; |
| 1609 | if (err < 0) { |
| 1610 | err = -EMSGSIZE; |
| 1611 | goto out_free; |
| 1612 | } |
| 1613 | |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 1614 | return rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | |
| 1616 | out_free: |
| 1617 | kfree_skb(skb); |
| 1618 | return err; |
| 1619 | } |
| 1620 | |
| 1621 | /* |
| 1622 | * For routers, this is called from dn_fib_dump, but for endnodes its |
| 1623 | * called directly from the rtnetlink dispatch table. |
| 1624 | */ |
| 1625 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1626 | { |
| 1627 | struct dn_route *rt; |
| 1628 | int h, s_h; |
| 1629 | int idx, s_idx; |
| 1630 | |
| 1631 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
| 1632 | return -EINVAL; |
| 1633 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) |
| 1634 | return 0; |
| 1635 | |
| 1636 | s_h = cb->args[0]; |
| 1637 | s_idx = idx = cb->args[1]; |
| 1638 | for(h = 0; h <= dn_rt_hash_mask; h++) { |
| 1639 | if (h < s_h) |
| 1640 | continue; |
| 1641 | if (h > s_h) |
| 1642 | s_idx = 0; |
| 1643 | rcu_read_lock_bh(); |
| 1644 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; |
| 1645 | rt; |
| 1646 | rt = rcu_dereference(rt->u.rt_next), idx++) { |
| 1647 | if (idx < s_idx) |
| 1648 | continue; |
| 1649 | skb->dst = dst_clone(&rt->u.dst); |
| 1650 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1651 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
| 1652 | 1, NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | dst_release(xchg(&skb->dst, NULL)); |
| 1654 | rcu_read_unlock_bh(); |
| 1655 | goto done; |
| 1656 | } |
| 1657 | dst_release(xchg(&skb->dst, NULL)); |
| 1658 | } |
| 1659 | rcu_read_unlock_bh(); |
| 1660 | } |
| 1661 | |
| 1662 | done: |
| 1663 | cb->args[0] = h; |
| 1664 | cb->args[1] = idx; |
| 1665 | return skb->len; |
| 1666 | } |
| 1667 | |
| 1668 | #ifdef CONFIG_PROC_FS |
| 1669 | struct dn_rt_cache_iter_state { |
| 1670 | int bucket; |
| 1671 | }; |
| 1672 | |
| 1673 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) |
| 1674 | { |
| 1675 | struct dn_route *rt = NULL; |
| 1676 | struct dn_rt_cache_iter_state *s = seq->private; |
| 1677 | |
| 1678 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { |
| 1679 | rcu_read_lock_bh(); |
| 1680 | rt = dn_rt_hash_table[s->bucket].chain; |
| 1681 | if (rt) |
| 1682 | break; |
| 1683 | rcu_read_unlock_bh(); |
| 1684 | } |
| 1685 | return rt; |
| 1686 | } |
| 1687 | |
| 1688 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) |
| 1689 | { |
| 1690 | struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); |
| 1691 | |
| 1692 | rt = rt->u.rt_next; |
| 1693 | while(!rt) { |
| 1694 | rcu_read_unlock_bh(); |
| 1695 | if (--s->bucket < 0) |
| 1696 | break; |
| 1697 | rcu_read_lock_bh(); |
| 1698 | rt = dn_rt_hash_table[s->bucket].chain; |
| 1699 | } |
| 1700 | return rt; |
| 1701 | } |
| 1702 | |
| 1703 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 1704 | { |
| 1705 | struct dn_route *rt = dn_rt_cache_get_first(seq); |
| 1706 | |
| 1707 | if (rt) { |
| 1708 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) |
| 1709 | --*pos; |
| 1710 | } |
| 1711 | return *pos ? NULL : rt; |
| 1712 | } |
| 1713 | |
| 1714 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1715 | { |
| 1716 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); |
| 1717 | ++*pos; |
| 1718 | return rt; |
| 1719 | } |
| 1720 | |
| 1721 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 1722 | { |
| 1723 | if (v) |
| 1724 | rcu_read_unlock_bh(); |
| 1725 | } |
| 1726 | |
| 1727 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) |
| 1728 | { |
| 1729 | struct dn_route *rt = v; |
| 1730 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; |
| 1731 | |
| 1732 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", |
| 1733 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", |
| 1734 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), |
| 1735 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), |
| 1736 | atomic_read(&rt->u.dst.__refcnt), |
| 1737 | rt->u.dst.__use, |
| 1738 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); |
| 1739 | return 0; |
| 1740 | } |
| 1741 | |
| 1742 | static struct seq_operations dn_rt_cache_seq_ops = { |
| 1743 | .start = dn_rt_cache_seq_start, |
| 1744 | .next = dn_rt_cache_seq_next, |
| 1745 | .stop = dn_rt_cache_seq_stop, |
| 1746 | .show = dn_rt_cache_seq_show, |
| 1747 | }; |
| 1748 | |
| 1749 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) |
| 1750 | { |
| 1751 | struct seq_file *seq; |
| 1752 | int rc = -ENOMEM; |
| 1753 | struct dn_rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1754 | |
| 1755 | if (!s) |
| 1756 | goto out; |
| 1757 | rc = seq_open(file, &dn_rt_cache_seq_ops); |
| 1758 | if (rc) |
| 1759 | goto out_kfree; |
| 1760 | seq = file->private_data; |
| 1761 | seq->private = s; |
| 1762 | memset(s, 0, sizeof(*s)); |
| 1763 | out: |
| 1764 | return rc; |
| 1765 | out_kfree: |
| 1766 | kfree(s); |
| 1767 | goto out; |
| 1768 | } |
| 1769 | |
| 1770 | static struct file_operations dn_rt_cache_seq_fops = { |
| 1771 | .owner = THIS_MODULE, |
| 1772 | .open = dn_rt_cache_seq_open, |
| 1773 | .read = seq_read, |
| 1774 | .llseek = seq_lseek, |
| 1775 | .release = seq_release_private, |
| 1776 | }; |
| 1777 | |
| 1778 | #endif /* CONFIG_PROC_FS */ |
| 1779 | |
| 1780 | void __init dn_route_init(void) |
| 1781 | { |
| 1782 | int i, goal, order; |
| 1783 | |
Alexey Dobriyan | e5d679f | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 1784 | dn_dst_ops.kmem_cachep = |
| 1785 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, |
| 1786 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | init_timer(&dn_route_timer); |
| 1788 | dn_route_timer.function = dn_dst_check_expire; |
| 1789 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
| 1790 | add_timer(&dn_route_timer); |
| 1791 | |
| 1792 | goal = num_physpages >> (26 - PAGE_SHIFT); |
| 1793 | |
| 1794 | for(order = 0; (1UL << order) < goal; order++) |
| 1795 | /* NOTHING */; |
| 1796 | |
| 1797 | /* |
| 1798 | * Only want 1024 entries max, since the table is very, very unlikely |
| 1799 | * to be larger than that. |
| 1800 | */ |
| 1801 | while(order && ((((1UL << order) * PAGE_SIZE) / |
| 1802 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) |
| 1803 | order--; |
| 1804 | |
| 1805 | do { |
| 1806 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / |
| 1807 | sizeof(struct dn_rt_hash_bucket); |
| 1808 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) |
| 1809 | dn_rt_hash_mask--; |
| 1810 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) |
| 1811 | __get_free_pages(GFP_ATOMIC, order); |
| 1812 | } while (dn_rt_hash_table == NULL && --order > 0); |
| 1813 | |
| 1814 | if (!dn_rt_hash_table) |
| 1815 | panic("Failed to allocate DECnet route cache hash table\n"); |
| 1816 | |
| 1817 | printk(KERN_INFO |
| 1818 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", |
| 1819 | dn_rt_hash_mask, |
| 1820 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
| 1821 | |
| 1822 | dn_rt_hash_mask--; |
| 1823 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 1824 | spin_lock_init(&dn_rt_hash_table[i].lock); |
| 1825 | dn_rt_hash_table[i].chain = NULL; |
| 1826 | } |
| 1827 | |
| 1828 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
| 1829 | |
| 1830 | proc_net_fops_create("decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
| 1831 | } |
| 1832 | |
| 1833 | void __exit dn_route_cleanup(void) |
| 1834 | { |
| 1835 | del_timer(&dn_route_timer); |
| 1836 | dn_run_flush(0); |
| 1837 | |
| 1838 | proc_net_remove("decnet_cache"); |
| 1839 | } |
| 1840 | |