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 |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 80 | #include <net/net_namespace.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 81 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <net/neighbour.h> |
| 83 | #include <net/dst.h> |
| 84 | #include <net/flow.h> |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 85 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <net/dn.h> |
| 87 | #include <net/dn_dev.h> |
| 88 | #include <net/dn_nsp.h> |
| 89 | #include <net/dn_route.h> |
| 90 | #include <net/dn_neigh.h> |
| 91 | #include <net/dn_fib.h> |
| 92 | |
| 93 | struct dn_rt_hash_bucket |
| 94 | { |
| 95 | struct dn_route *chain; |
| 96 | spinlock_t lock; |
| 97 | } __attribute__((__aligned__(8))); |
| 98 | |
| 99 | extern struct neigh_table dn_neigh_table; |
| 100 | |
| 101 | |
| 102 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; |
| 103 | |
| 104 | static const int dn_rt_min_delay = 2 * HZ; |
| 105 | static const int dn_rt_max_delay = 10 * HZ; |
| 106 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; |
| 107 | |
| 108 | static unsigned long dn_rt_deadline; |
| 109 | |
| 110 | static int dn_dst_gc(void); |
| 111 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
| 112 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
| 113 | static void dn_dst_link_failure(struct sk_buff *); |
| 114 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 115 | static int dn_route_input(struct sk_buff *); |
| 116 | static void dn_run_flush(unsigned long dummy); |
| 117 | |
| 118 | static struct dn_rt_hash_bucket *dn_rt_hash_table; |
| 119 | static unsigned dn_rt_hash_mask; |
| 120 | |
| 121 | static struct timer_list dn_route_timer; |
Ingo Molnar | 8d06afa | 2005-09-09 13:10:40 -0700 | [diff] [blame] | 122 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | int decnet_dst_gc_interval = 2; |
| 124 | |
| 125 | static struct dst_ops dn_dst_ops = { |
| 126 | .family = PF_DECnet, |
| 127 | .protocol = __constant_htons(ETH_P_DNA_RT), |
| 128 | .gc_thresh = 128, |
| 129 | .gc = dn_dst_gc, |
| 130 | .check = dn_dst_check, |
| 131 | .negative_advice = dn_dst_negative_advice, |
| 132 | .link_failure = dn_dst_link_failure, |
| 133 | .update_pmtu = dn_dst_update_pmtu, |
| 134 | .entry_size = sizeof(struct dn_route), |
| 135 | .entries = ATOMIC_INIT(0), |
| 136 | }; |
| 137 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 138 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 140 | __u16 tmp = (__u16 __force)(src ^ dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | tmp ^= (tmp >> 3); |
| 142 | tmp ^= (tmp >> 5); |
| 143 | tmp ^= (tmp >> 10); |
| 144 | return dn_rt_hash_mask & (unsigned)tmp; |
| 145 | } |
| 146 | |
| 147 | static inline void dnrt_free(struct dn_route *rt) |
| 148 | { |
| 149 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 150 | } |
| 151 | |
| 152 | static inline void dnrt_drop(struct dn_route *rt) |
| 153 | { |
Adrian Bunk | 3400112 | 2006-03-20 23:00:29 -0800 | [diff] [blame] | 154 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 156 | } |
| 157 | |
| 158 | static void dn_dst_check_expire(unsigned long dummy) |
| 159 | { |
| 160 | int i; |
| 161 | struct dn_route *rt, **rtp; |
| 162 | unsigned long now = jiffies; |
| 163 | unsigned long expire = 120 * HZ; |
| 164 | |
| 165 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 166 | rtp = &dn_rt_hash_table[i].chain; |
| 167 | |
| 168 | spin_lock(&dn_rt_hash_table[i].lock); |
| 169 | while((rt=*rtp) != NULL) { |
| 170 | if (atomic_read(&rt->u.dst.__refcnt) || |
| 171 | (now - rt->u.dst.lastuse) < expire) { |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 172 | rtp = &rt->u.dst.dn_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | continue; |
| 174 | } |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 175 | *rtp = rt->u.dst.dn_next; |
| 176 | rt->u.dst.dn_next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | dnrt_free(rt); |
| 178 | } |
| 179 | spin_unlock(&dn_rt_hash_table[i].lock); |
| 180 | |
| 181 | if ((jiffies - now) > 0) |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); |
| 186 | } |
| 187 | |
| 188 | static int dn_dst_gc(void) |
| 189 | { |
| 190 | struct dn_route *rt, **rtp; |
| 191 | int i; |
| 192 | unsigned long now = jiffies; |
| 193 | unsigned long expire = 10 * HZ; |
| 194 | |
| 195 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 196 | |
| 197 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
| 198 | rtp = &dn_rt_hash_table[i].chain; |
| 199 | |
| 200 | while((rt=*rtp) != NULL) { |
| 201 | if (atomic_read(&rt->u.dst.__refcnt) || |
| 202 | (now - rt->u.dst.lastuse) < expire) { |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 203 | rtp = &rt->u.dst.dn_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | continue; |
| 205 | } |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 206 | *rtp = rt->u.dst.dn_next; |
| 207 | rt->u.dst.dn_next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | dnrt_drop(rt); |
| 209 | break; |
| 210 | } |
| 211 | spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| 212 | } |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * The decnet standards don't impose a particular minimum mtu, what they |
| 219 | * do insist on is that the routing layer accepts a datagram of at least |
| 220 | * 230 bytes long. Here we have to subtract the routing header length from |
| 221 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we |
| 222 | * assume the worst and use a long header size. |
| 223 | * |
| 224 | * We update both the mtu and the advertised mss (i.e. the segment size we |
| 225 | * advertise to the other end). |
| 226 | */ |
| 227 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 228 | { |
| 229 | u32 min_mtu = 230; |
| 230 | struct dn_dev *dn = dst->neighbour ? |
| 231 | (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL; |
| 232 | |
| 233 | if (dn && dn->use_long == 0) |
| 234 | min_mtu -= 6; |
| 235 | else |
| 236 | min_mtu -= 21; |
| 237 | |
| 238 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) { |
| 239 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
| 240 | dst->metrics[RTAX_MTU-1] = mtu; |
| 241 | dst_set_expires(dst, dn_rt_mtu_expires); |
| 242 | } |
| 243 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { |
| 244 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; |
| 245 | if (dst->metrics[RTAX_ADVMSS-1] > mss) |
| 246 | dst->metrics[RTAX_ADVMSS-1] = mss; |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 251 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | * When a route has been marked obsolete. (e.g. routing cache flush) |
| 253 | */ |
| 254 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) |
| 255 | { |
| 256 | return NULL; |
| 257 | } |
| 258 | |
| 259 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) |
| 260 | { |
| 261 | dst_release(dst); |
| 262 | return NULL; |
| 263 | } |
| 264 | |
| 265 | static void dn_dst_link_failure(struct sk_buff *skb) |
| 266 | { |
| 267 | return; |
| 268 | } |
| 269 | |
| 270 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
| 271 | { |
David S. Miller | 8238b21 | 2006-10-12 00:49:15 -0700 | [diff] [blame] | 272 | return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) | |
| 273 | (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) | |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 274 | (fl1->mark ^ fl2->mark) | |
David S. Miller | 8238b21 | 2006-10-12 00:49:15 -0700 | [diff] [blame] | 275 | (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) | |
| 276 | (fl1->oif ^ fl2->oif) | |
| 277 | (fl1->iif ^ fl2->iif)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) |
| 281 | { |
| 282 | struct dn_route *rth, **rthp; |
| 283 | unsigned long now = jiffies; |
| 284 | |
| 285 | rthp = &dn_rt_hash_table[hash].chain; |
| 286 | |
| 287 | spin_lock_bh(&dn_rt_hash_table[hash].lock); |
| 288 | while((rth = *rthp) != NULL) { |
| 289 | if (compare_keys(&rth->fl, &rt->fl)) { |
| 290 | /* Put it first */ |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 291 | *rthp = rth->u.dst.dn_next; |
| 292 | rcu_assign_pointer(rth->u.dst.dn_next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | dn_rt_hash_table[hash].chain); |
| 294 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); |
| 295 | |
| 296 | rth->u.dst.__use++; |
| 297 | dst_hold(&rth->u.dst); |
| 298 | rth->u.dst.lastuse = now; |
| 299 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| 300 | |
| 301 | dnrt_drop(rt); |
| 302 | *rp = rth; |
| 303 | return 0; |
| 304 | } |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 305 | rthp = &rth->u.dst.dn_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 308 | rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | dst_hold(&rt->u.dst); |
| 312 | rt->u.dst.__use++; |
| 313 | rt->u.dst.lastuse = now; |
| 314 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
| 315 | *rp = rt; |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | void dn_run_flush(unsigned long dummy) |
| 320 | { |
| 321 | int i; |
| 322 | struct dn_route *rt, *next; |
| 323 | |
| 324 | for(i = 0; i < dn_rt_hash_mask; i++) { |
| 325 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
| 326 | |
| 327 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) |
| 328 | goto nothing_to_declare; |
| 329 | |
| 330 | for(; rt; rt=next) { |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 331 | next = rt->u.dst.dn_next; |
| 332 | rt->u.dst.dn_next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | dst_free((struct dst_entry *)rt); |
| 334 | } |
| 335 | |
| 336 | nothing_to_declare: |
| 337 | spin_unlock_bh(&dn_rt_hash_table[i].lock); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static DEFINE_SPINLOCK(dn_rt_flush_lock); |
| 342 | |
| 343 | void dn_rt_cache_flush(int delay) |
| 344 | { |
| 345 | unsigned long now = jiffies; |
| 346 | int user_mode = !in_interrupt(); |
| 347 | |
| 348 | if (delay < 0) |
| 349 | delay = dn_rt_min_delay; |
| 350 | |
| 351 | spin_lock_bh(&dn_rt_flush_lock); |
| 352 | |
| 353 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { |
| 354 | long tmo = (long)(dn_rt_deadline - now); |
| 355 | |
| 356 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) |
| 357 | tmo = 0; |
| 358 | |
| 359 | if (delay > tmo) |
| 360 | delay = tmo; |
| 361 | } |
| 362 | |
| 363 | if (delay <= 0) { |
| 364 | spin_unlock_bh(&dn_rt_flush_lock); |
| 365 | dn_run_flush(0); |
| 366 | return; |
| 367 | } |
| 368 | |
| 369 | if (dn_rt_deadline == 0) |
| 370 | dn_rt_deadline = now + dn_rt_max_delay; |
| 371 | |
| 372 | dn_rt_flush_timer.expires = now + delay; |
| 373 | add_timer(&dn_rt_flush_timer); |
| 374 | spin_unlock_bh(&dn_rt_flush_lock); |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * dn_return_short - Return a short packet to its sender |
| 379 | * @skb: The packet to return |
| 380 | * |
| 381 | */ |
| 382 | static int dn_return_short(struct sk_buff *skb) |
| 383 | { |
| 384 | struct dn_skb_cb *cb; |
| 385 | unsigned char *ptr; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 386 | __le16 *src; |
| 387 | __le16 *dst; |
| 388 | __le16 tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | /* Add back headers */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 391 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| 394 | return NET_RX_DROP; |
| 395 | |
| 396 | cb = DN_SKB_CB(skb); |
| 397 | /* Skip packet length and point to flags */ |
| 398 | ptr = skb->data + 2; |
| 399 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| 400 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 401 | dst = (__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 403 | src = (__le16 *)ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | ptr += 2; |
| 405 | *ptr = 0; /* Zero hop count */ |
| 406 | |
| 407 | /* Swap source and destination */ |
| 408 | tmp = *src; |
| 409 | *src = *dst; |
| 410 | *dst = tmp; |
| 411 | |
| 412 | skb->pkt_type = PACKET_OUTGOING; |
| 413 | dn_rt_finish_output(skb, NULL, NULL); |
| 414 | return NET_RX_SUCCESS; |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * dn_return_long - Return a long packet to its sender |
| 419 | * @skb: The long format packet to return |
| 420 | * |
| 421 | */ |
| 422 | static int dn_return_long(struct sk_buff *skb) |
| 423 | { |
| 424 | struct dn_skb_cb *cb; |
| 425 | unsigned char *ptr; |
| 426 | unsigned char *src_addr, *dst_addr; |
| 427 | unsigned char tmp[ETH_ALEN]; |
| 428 | |
| 429 | /* Add back all headers */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 430 | skb_push(skb, skb->data - skb_network_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
| 433 | return NET_RX_DROP; |
| 434 | |
| 435 | cb = DN_SKB_CB(skb); |
| 436 | /* Ignore packet length and point to flags */ |
| 437 | ptr = skb->data + 2; |
| 438 | |
| 439 | /* Skip padding */ |
| 440 | if (*ptr & DN_RT_F_PF) { |
| 441 | char padlen = (*ptr & ~DN_RT_F_PF); |
| 442 | ptr += padlen; |
| 443 | } |
| 444 | |
| 445 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
| 446 | ptr += 2; |
| 447 | dst_addr = ptr; |
| 448 | ptr += 8; |
| 449 | src_addr = ptr; |
| 450 | ptr += 6; |
| 451 | *ptr = 0; /* Zero hop count */ |
| 452 | |
| 453 | /* Swap source and destination */ |
| 454 | memcpy(tmp, src_addr, ETH_ALEN); |
| 455 | memcpy(src_addr, dst_addr, ETH_ALEN); |
| 456 | memcpy(dst_addr, tmp, ETH_ALEN); |
| 457 | |
| 458 | skb->pkt_type = PACKET_OUTGOING; |
| 459 | dn_rt_finish_output(skb, dst_addr, src_addr); |
| 460 | return NET_RX_SUCCESS; |
| 461 | } |
| 462 | |
| 463 | /** |
| 464 | * dn_route_rx_packet - Try and find a route for an incoming packet |
| 465 | * @skb: The packet to find a route for |
| 466 | * |
| 467 | * Returns: result of input function if route is found, error code otherwise |
| 468 | */ |
| 469 | static int dn_route_rx_packet(struct sk_buff *skb) |
| 470 | { |
| 471 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 472 | int err; |
| 473 | |
| 474 | if ((err = dn_route_input(skb)) == 0) |
| 475 | return dst_input(skb); |
| 476 | |
| 477 | if (decnet_debug_level & 4) { |
| 478 | char *devname = skb->dev ? skb->dev->name : "???"; |
| 479 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 480 | printk(KERN_DEBUG |
| 481 | "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] | 482 | (int)cb->rt_flags, devname, skb->len, |
| 483 | dn_ntohs(cb->src), dn_ntohs(cb->dst), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | err, skb->pkt_type); |
| 485 | } |
| 486 | |
| 487 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { |
| 488 | switch(cb->rt_flags & DN_RT_PKT_MSK) { |
| 489 | case DN_RT_PKT_SHORT: |
| 490 | return dn_return_short(skb); |
| 491 | case DN_RT_PKT_LONG: |
| 492 | return dn_return_long(skb); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | kfree_skb(skb); |
| 497 | return NET_RX_DROP; |
| 498 | } |
| 499 | |
| 500 | static int dn_route_rx_long(struct sk_buff *skb) |
| 501 | { |
| 502 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 503 | unsigned char *ptr = skb->data; |
| 504 | |
| 505 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ |
| 506 | goto drop_it; |
| 507 | |
| 508 | skb_pull(skb, 20); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 509 | skb_reset_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 511 | /* Destination info */ |
| 512 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 513 | cb->dst = dn_eth2dn(ptr); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 514 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| 515 | goto drop_it; |
| 516 | ptr += 6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 519 | /* Source info */ |
| 520 | ptr += 2; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 521 | cb->src = dn_eth2dn(ptr); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 522 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
| 523 | goto drop_it; |
| 524 | ptr += 6; |
| 525 | /* Other junk */ |
| 526 | ptr++; |
| 527 | cb->hops = *ptr++; /* Visit Count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
| 529 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); |
| 530 | |
| 531 | drop_it: |
| 532 | kfree_skb(skb); |
| 533 | return NET_RX_DROP; |
| 534 | } |
| 535 | |
| 536 | |
| 537 | |
| 538 | static int dn_route_rx_short(struct sk_buff *skb) |
| 539 | { |
| 540 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 541 | unsigned char *ptr = skb->data; |
| 542 | |
| 543 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ |
| 544 | goto drop_it; |
| 545 | |
| 546 | skb_pull(skb, 5); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 547 | skb_reset_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 549 | cb->dst = *(__le16 *)ptr; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 550 | ptr += 2; |
| 551 | cb->src = *(__le16 *)ptr; |
| 552 | ptr += 2; |
| 553 | cb->hops = *ptr & 0x3f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); |
| 556 | |
| 557 | drop_it: |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 558 | kfree_skb(skb); |
| 559 | return NET_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static int dn_route_discard(struct sk_buff *skb) |
| 563 | { |
| 564 | /* |
| 565 | * I know we drop the packet here, but thats considered success in |
| 566 | * this case |
| 567 | */ |
| 568 | kfree_skb(skb); |
| 569 | return NET_RX_SUCCESS; |
| 570 | } |
| 571 | |
| 572 | static int dn_route_ptp_hello(struct sk_buff *skb) |
| 573 | { |
| 574 | dn_dev_hello(skb); |
| 575 | dn_neigh_pointopoint_hello(skb); |
| 576 | return NET_RX_SUCCESS; |
| 577 | } |
| 578 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 579 | 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] | 580 | { |
| 581 | struct dn_skb_cb *cb; |
| 582 | unsigned char flags = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 583 | __u16 len = dn_ntohs(*(__le16 *)skb->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
| 585 | unsigned char padlen = 0; |
| 586 | |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 587 | if (dev->nd_net != &init_net) |
| 588 | goto dump_it; |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | if (dn == NULL) |
| 591 | goto dump_it; |
| 592 | |
| 593 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 594 | goto out; |
| 595 | |
| 596 | if (!pskb_may_pull(skb, 3)) |
| 597 | goto dump_it; |
| 598 | |
| 599 | skb_pull(skb, 2); |
| 600 | |
| 601 | if (len > skb->len) |
| 602 | goto dump_it; |
| 603 | |
| 604 | skb_trim(skb, len); |
| 605 | |
| 606 | flags = *skb->data; |
| 607 | |
| 608 | cb = DN_SKB_CB(skb); |
| 609 | cb->stamp = jiffies; |
| 610 | cb->iif = dev->ifindex; |
| 611 | |
| 612 | /* |
| 613 | * If we have padding, remove it. |
| 614 | */ |
| 615 | if (flags & DN_RT_F_PF) { |
| 616 | padlen = flags & ~DN_RT_F_PF; |
| 617 | if (!pskb_may_pull(skb, padlen + 1)) |
| 618 | goto dump_it; |
| 619 | skb_pull(skb, padlen); |
| 620 | flags = *skb->data; |
| 621 | } |
| 622 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 623 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
| 625 | /* |
| 626 | * Weed out future version DECnet |
| 627 | */ |
| 628 | if (flags & DN_RT_F_VER) |
| 629 | goto dump_it; |
| 630 | |
| 631 | cb->rt_flags = flags; |
| 632 | |
| 633 | if (decnet_debug_level & 1) |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 634 | printk(KERN_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 636 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | padlen); |
| 638 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 639 | if (flags & DN_RT_PKT_CNTL) { |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 640 | if (unlikely(skb_linearize(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | goto dump_it; |
| 642 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 643 | switch(flags & DN_RT_CNTL_MSK) { |
| 644 | case DN_RT_PKT_INIT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | dn_dev_init_pkt(skb); |
| 646 | break; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 647 | case DN_RT_PKT_VERI: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | dn_dev_veri_pkt(skb); |
| 649 | break; |
| 650 | } |
| 651 | |
| 652 | if (dn->parms.state != DN_DEV_S_RU) |
| 653 | goto dump_it; |
| 654 | |
| 655 | switch(flags & DN_RT_CNTL_MSK) { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 656 | case DN_RT_PKT_HELO: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); |
| 658 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 659 | case DN_RT_PKT_L1RT: |
| 660 | case DN_RT_PKT_L2RT: |
| 661 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); |
| 662 | case DN_RT_PKT_ERTH: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); |
| 664 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 665 | case DN_RT_PKT_EEDH: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 667 | } |
| 668 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | if (dn->parms.state != DN_DEV_S_RU) |
| 670 | goto dump_it; |
| 671 | |
| 672 | skb_pull(skb, 1); /* Pull flags */ |
| 673 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 674 | switch(flags & DN_RT_PKT_MSK) { |
| 675 | case DN_RT_PKT_LONG: |
| 676 | return dn_route_rx_long(skb); |
| 677 | case DN_RT_PKT_SHORT: |
| 678 | return dn_route_rx_short(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | dump_it: |
| 683 | kfree_skb(skb); |
| 684 | out: |
| 685 | return NET_RX_DROP; |
| 686 | } |
| 687 | |
| 688 | static int dn_output(struct sk_buff *skb) |
| 689 | { |
| 690 | struct dst_entry *dst = skb->dst; |
| 691 | struct dn_route *rt = (struct dn_route *)dst; |
| 692 | struct net_device *dev = dst->dev; |
| 693 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 694 | struct neighbour *neigh; |
| 695 | |
| 696 | int err = -EINVAL; |
| 697 | |
| 698 | if ((neigh = dst->neighbour) == NULL) |
| 699 | goto error; |
| 700 | |
| 701 | skb->dev = dev; |
| 702 | |
| 703 | cb->src = rt->rt_saddr; |
| 704 | cb->dst = rt->rt_daddr; |
| 705 | |
| 706 | /* |
| 707 | * Always set the Intra-Ethernet bit on all outgoing packets |
| 708 | * originated on this node. Only valid flag from upper layers |
| 709 | * is return-to-sender-requested. Set hop count to 0 too. |
| 710 | */ |
| 711 | cb->rt_flags &= ~DN_RT_F_RQR; |
| 712 | cb->rt_flags |= DN_RT_F_IE; |
| 713 | cb->hops = 0; |
| 714 | |
| 715 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); |
| 716 | |
| 717 | error: |
| 718 | if (net_ratelimit()) |
| 719 | printk(KERN_DEBUG "dn_output: This should not happen\n"); |
| 720 | |
| 721 | kfree_skb(skb); |
| 722 | |
| 723 | return err; |
| 724 | } |
| 725 | |
| 726 | static int dn_forward(struct sk_buff *skb) |
| 727 | { |
| 728 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 729 | struct dst_entry *dst = skb->dst; |
| 730 | struct dn_dev *dn_db = dst->dev->dn_ptr; |
| 731 | struct dn_route *rt; |
| 732 | struct neighbour *neigh = dst->neighbour; |
| 733 | int header_len; |
| 734 | #ifdef CONFIG_NETFILTER |
| 735 | struct net_device *dev = skb->dev; |
| 736 | #endif |
| 737 | |
| 738 | if (skb->pkt_type != PACKET_HOST) |
| 739 | goto drop; |
| 740 | |
| 741 | /* Ensure that we have enough space for headers */ |
| 742 | rt = (struct dn_route *)skb->dst; |
| 743 | header_len = dn_db->use_long ? 21 : 6; |
| 744 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) |
| 745 | goto drop; |
| 746 | |
| 747 | /* |
| 748 | * Hop count exceeded. |
| 749 | */ |
| 750 | if (++cb->hops > 30) |
| 751 | goto drop; |
| 752 | |
| 753 | skb->dev = rt->u.dst.dev; |
| 754 | |
| 755 | /* |
| 756 | * If packet goes out same interface it came in on, then set |
| 757 | * the Intra-Ethernet bit. This has no effect for short |
| 758 | * packets, so we don't need to test for them here. |
| 759 | */ |
| 760 | cb->rt_flags &= ~DN_RT_F_IE; |
| 761 | if (rt->rt_flags & RTCF_DOREDIRECT) |
| 762 | cb->rt_flags |= DN_RT_F_IE; |
| 763 | |
| 764 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); |
| 765 | |
| 766 | drop: |
| 767 | kfree_skb(skb); |
| 768 | return NET_RX_DROP; |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Drop packet. This is used for endnodes and for |
| 773 | * when we should not be forwarding packets from |
| 774 | * this dest. |
| 775 | */ |
| 776 | static int dn_blackhole(struct sk_buff *skb) |
| 777 | { |
| 778 | kfree_skb(skb); |
| 779 | return NET_RX_DROP; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * Used to catch bugs. This should never normally get |
| 784 | * called. |
| 785 | */ |
| 786 | static int dn_rt_bug(struct sk_buff *skb) |
| 787 | { |
| 788 | if (net_ratelimit()) { |
| 789 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 790 | |
| 791 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 792 | dn_ntohs(cb->src), dn_ntohs(cb->dst)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
| 795 | kfree_skb(skb); |
| 796 | |
| 797 | return NET_RX_BAD; |
| 798 | } |
| 799 | |
| 800 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
| 801 | { |
| 802 | struct dn_fib_info *fi = res->fi; |
| 803 | struct net_device *dev = rt->u.dst.dev; |
| 804 | struct neighbour *n; |
| 805 | unsigned mss; |
| 806 | |
| 807 | if (fi) { |
| 808 | if (DN_FIB_RES_GW(*res) && |
| 809 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| 810 | rt->rt_gateway = DN_FIB_RES_GW(*res); |
| 811 | memcpy(rt->u.dst.metrics, fi->fib_metrics, |
| 812 | sizeof(rt->u.dst.metrics)); |
| 813 | } |
| 814 | rt->rt_type = res->type; |
| 815 | |
| 816 | if (dev != NULL && rt->u.dst.neighbour == NULL) { |
| 817 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
| 818 | if (IS_ERR(n)) |
| 819 | return PTR_ERR(n); |
| 820 | rt->u.dst.neighbour = n; |
| 821 | } |
| 822 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 823 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || |
| 824 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
| 826 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); |
| 827 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || |
| 828 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) |
| 829 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; |
| 830 | return 0; |
| 831 | } |
| 832 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 833 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | { |
| 835 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); |
| 836 | int match = 16; |
| 837 | while(tmp) { |
| 838 | tmp >>= 1; |
| 839 | match--; |
| 840 | } |
| 841 | return match; |
| 842 | } |
| 843 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 844 | 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] | 845 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 846 | __le16 saddr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | struct dn_dev *dn_db = dev->dn_ptr; |
| 848 | struct dn_ifaddr *ifa; |
| 849 | int best_match = 0; |
| 850 | int ret; |
| 851 | |
| 852 | read_lock(&dev_base_lock); |
| 853 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { |
| 854 | if (ifa->ifa_scope > scope) |
| 855 | continue; |
| 856 | if (!daddr) { |
| 857 | saddr = ifa->ifa_local; |
| 858 | break; |
| 859 | } |
| 860 | ret = dn_match_addr(daddr, ifa->ifa_local); |
| 861 | if (ret > best_match) |
| 862 | saddr = ifa->ifa_local; |
| 863 | if (best_match == 0) |
| 864 | saddr = ifa->ifa_local; |
| 865 | } |
| 866 | read_unlock(&dev_base_lock); |
| 867 | |
| 868 | return saddr; |
| 869 | } |
| 870 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 871 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
| 873 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); |
| 874 | } |
| 875 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 876 | 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] | 877 | { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 878 | __le16 mask = dnet_make_mask(res->prefixlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
| 880 | } |
| 881 | |
| 882 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) |
| 883 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 884 | struct flowi fl = { .nl_u = { .dn_u = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | { .daddr = oldflp->fld_dst, |
| 886 | .saddr = oldflp->fld_src, |
| 887 | .scope = RT_SCOPE_UNIVERSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 889 | .mark = oldflp->mark, |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 890 | .iif = init_net.loopback_dev->ifindex, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | .oif = oldflp->oif }; |
| 892 | struct dn_route *rt = NULL; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 893 | struct net_device *dev_out = NULL, *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | struct neighbour *neigh = NULL; |
| 895 | unsigned hash; |
| 896 | unsigned flags = 0; |
| 897 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; |
| 898 | int err; |
| 899 | int free_res = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 900 | __le16 gateway = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | if (decnet_debug_level & 16) |
| 903 | printk(KERN_DEBUG |
| 904 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 905 | " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), |
| 906 | dn_ntohs(oldflp->fld_src), |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 907 | oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | /* If we have an output interface, verify its a DECnet device */ |
| 910 | if (oldflp->oif) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 911 | dev_out = dev_get_by_index(&init_net, oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | err = -ENODEV; |
| 913 | if (dev_out && dev_out->dn_ptr == NULL) { |
| 914 | dev_put(dev_out); |
| 915 | dev_out = NULL; |
| 916 | } |
| 917 | if (dev_out == NULL) |
| 918 | goto out; |
| 919 | } |
| 920 | |
| 921 | /* If we have a source address, verify that its a local address */ |
| 922 | if (oldflp->fld_src) { |
| 923 | err = -EADDRNOTAVAIL; |
| 924 | |
| 925 | if (dev_out) { |
| 926 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) |
| 927 | goto source_ok; |
| 928 | dev_put(dev_out); |
| 929 | goto out; |
| 930 | } |
| 931 | read_lock(&dev_base_lock); |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 932 | for_each_netdev(&init_net, dev) { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 933 | if (!dev->dn_ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | continue; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 935 | if (!dn_dev_islocal(dev, oldflp->fld_src)) |
Patrick Caulfield | 9bbf28a1 | 2006-08-02 14:14:44 -0700 | [diff] [blame] | 936 | continue; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 937 | if ((dev->flags & IFF_LOOPBACK) && |
Patrick Caulfield | 9bbf28a1 | 2006-08-02 14:14:44 -0700 | [diff] [blame] | 938 | oldflp->fld_dst && |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 939 | !dn_dev_islocal(dev, oldflp->fld_dst)) |
Patrick Caulfield | 9bbf28a1 | 2006-08-02 14:14:44 -0700 | [diff] [blame] | 940 | continue; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 941 | |
| 942 | dev_out = dev; |
Patrick Caulfield | 9bbf28a1 | 2006-08-02 14:14:44 -0700 | [diff] [blame] | 943 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | read_unlock(&dev_base_lock); |
| 946 | if (dev_out == NULL) |
| 947 | goto out; |
| 948 | dev_hold(dev_out); |
| 949 | source_ok: |
| 950 | ; |
| 951 | } |
| 952 | |
| 953 | /* No destination? Assume its local */ |
| 954 | if (!fl.fld_dst) { |
| 955 | fl.fld_dst = fl.fld_src; |
| 956 | |
| 957 | err = -EADDRNOTAVAIL; |
| 958 | if (dev_out) |
| 959 | dev_put(dev_out); |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 960 | dev_out = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | dev_hold(dev_out); |
| 962 | if (!fl.fld_dst) { |
| 963 | fl.fld_dst = |
| 964 | fl.fld_src = dnet_select_source(dev_out, 0, |
| 965 | RT_SCOPE_HOST); |
| 966 | if (!fl.fld_dst) |
| 967 | goto out; |
| 968 | } |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 969 | fl.oif = init_net.loopback_dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | res.type = RTN_LOCAL; |
| 971 | goto make_route; |
| 972 | } |
| 973 | |
| 974 | if (decnet_debug_level & 16) |
| 975 | printk(KERN_DEBUG |
| 976 | "dn_route_output_slow: initial checks complete." |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 977 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
| 978 | dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src), |
| 979 | fl.oif, try_hard); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
| 981 | /* |
| 982 | * N.B. If the kernel is compiled without router support then |
| 983 | * dn_fib_lookup() will evaluate to non-zero so this if () block |
| 984 | * will always be executed. |
| 985 | */ |
| 986 | err = -ESRCH; |
| 987 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { |
| 988 | struct dn_dev *dn_db; |
| 989 | if (err != -ESRCH) |
| 990 | goto out; |
| 991 | /* |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 992 | * Here the fallback is basically the standard algorithm for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | * routing in endnodes which is described in the DECnet routing |
| 994 | * docs |
| 995 | * |
| 996 | * If we are not trying hard, look in neighbour cache. |
| 997 | * The result is tested to ensure that if a specific output |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 998 | * device/source address was requested, then we honour that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | * here |
| 1000 | */ |
| 1001 | if (!try_hard) { |
| 1002 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); |
| 1003 | if (neigh) { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1004 | if ((oldflp->oif && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | (neigh->dev->ifindex != oldflp->oif)) || |
| 1006 | (oldflp->fld_src && |
| 1007 | (!dn_dev_islocal(neigh->dev, |
| 1008 | oldflp->fld_src)))) { |
| 1009 | neigh_release(neigh); |
| 1010 | neigh = NULL; |
| 1011 | } else { |
| 1012 | if (dev_out) |
| 1013 | dev_put(dev_out); |
| 1014 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1015 | dev_out = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | res.type = RTN_LOCAL; |
| 1017 | } else { |
| 1018 | dev_out = neigh->dev; |
| 1019 | } |
| 1020 | dev_hold(dev_out); |
| 1021 | goto select_source; |
| 1022 | } |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | /* Not there? Perhaps its a local address */ |
| 1027 | if (dev_out == NULL) |
| 1028 | dev_out = dn_dev_get_default(); |
| 1029 | err = -ENODEV; |
| 1030 | if (dev_out == NULL) |
| 1031 | goto out; |
| 1032 | dn_db = dev_out->dn_ptr; |
| 1033 | /* Possible improvement - check all devices for local addr */ |
| 1034 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { |
| 1035 | dev_put(dev_out); |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1036 | dev_out = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | dev_hold(dev_out); |
| 1038 | res.type = RTN_LOCAL; |
| 1039 | goto select_source; |
| 1040 | } |
| 1041 | /* Not local either.... try sending it to the default router */ |
| 1042 | neigh = neigh_clone(dn_db->router); |
| 1043 | BUG_ON(neigh && neigh->dev != dev_out); |
| 1044 | |
| 1045 | /* Ok then, we assume its directly connected and move on */ |
| 1046 | select_source: |
| 1047 | if (neigh) |
| 1048 | gateway = ((struct dn_neigh *)neigh)->addr; |
| 1049 | if (gateway == 0) |
| 1050 | gateway = fl.fld_dst; |
| 1051 | if (fl.fld_src == 0) { |
| 1052 | fl.fld_src = dnet_select_source(dev_out, gateway, |
| 1053 | res.type == RTN_LOCAL ? |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1054 | RT_SCOPE_HOST : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | RT_SCOPE_LINK); |
| 1056 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) |
| 1057 | goto e_addr; |
| 1058 | } |
| 1059 | fl.oif = dev_out->ifindex; |
| 1060 | goto make_route; |
| 1061 | } |
| 1062 | free_res = 1; |
| 1063 | |
| 1064 | if (res.type == RTN_NAT) |
| 1065 | goto e_inval; |
| 1066 | |
| 1067 | if (res.type == RTN_LOCAL) { |
| 1068 | if (!fl.fld_src) |
| 1069 | fl.fld_src = fl.fld_dst; |
| 1070 | if (dev_out) |
| 1071 | dev_put(dev_out); |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1072 | dev_out = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | dev_hold(dev_out); |
| 1074 | fl.oif = dev_out->ifindex; |
| 1075 | if (res.fi) |
| 1076 | dn_fib_info_put(res.fi); |
| 1077 | res.fi = NULL; |
| 1078 | goto make_route; |
| 1079 | } |
| 1080 | |
| 1081 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 1082 | dn_fib_select_multipath(&fl, &res); |
| 1083 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1084 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | * We could add some logic to deal with default routes here and |
| 1086 | * get rid of some of the special casing above. |
| 1087 | */ |
| 1088 | |
| 1089 | if (!fl.fld_src) |
| 1090 | fl.fld_src = DN_FIB_RES_PREFSRC(res); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | if (dev_out) |
| 1093 | dev_put(dev_out); |
| 1094 | dev_out = DN_FIB_RES_DEV(res); |
| 1095 | dev_hold(dev_out); |
| 1096 | fl.oif = dev_out->ifindex; |
| 1097 | gateway = DN_FIB_RES_GW(res); |
| 1098 | |
| 1099 | make_route: |
| 1100 | if (dev_out->flags & IFF_LOOPBACK) |
| 1101 | flags |= RTCF_LOCAL; |
| 1102 | |
| 1103 | rt = dst_alloc(&dn_dst_ops); |
| 1104 | if (rt == NULL) |
| 1105 | goto e_nobufs; |
| 1106 | |
| 1107 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1108 | rt->u.dst.flags = DST_HOST; |
| 1109 | |
| 1110 | rt->fl.fld_src = oldflp->fld_src; |
| 1111 | rt->fl.fld_dst = oldflp->fld_dst; |
| 1112 | rt->fl.oif = oldflp->oif; |
| 1113 | rt->fl.iif = 0; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1114 | rt->fl.mark = oldflp->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | rt->rt_saddr = fl.fld_src; |
| 1117 | rt->rt_daddr = fl.fld_dst; |
| 1118 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; |
| 1119 | rt->rt_local_src = fl.fld_src; |
| 1120 | |
| 1121 | rt->rt_dst_map = fl.fld_dst; |
| 1122 | rt->rt_src_map = fl.fld_src; |
| 1123 | |
| 1124 | rt->u.dst.dev = dev_out; |
| 1125 | dev_hold(dev_out); |
| 1126 | rt->u.dst.neighbour = neigh; |
| 1127 | neigh = NULL; |
| 1128 | |
| 1129 | rt->u.dst.lastuse = jiffies; |
| 1130 | rt->u.dst.output = dn_output; |
| 1131 | rt->u.dst.input = dn_rt_bug; |
| 1132 | rt->rt_flags = flags; |
| 1133 | if (flags & RTCF_LOCAL) |
| 1134 | rt->u.dst.input = dn_nsp_rx; |
| 1135 | |
| 1136 | err = dn_rt_set_next_hop(rt, &res); |
| 1137 | if (err) |
| 1138 | goto e_neighbour; |
| 1139 | |
| 1140 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
| 1141 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
| 1142 | |
| 1143 | done: |
| 1144 | if (neigh) |
| 1145 | neigh_release(neigh); |
| 1146 | if (free_res) |
| 1147 | dn_fib_res_put(&res); |
| 1148 | if (dev_out) |
| 1149 | dev_put(dev_out); |
| 1150 | out: |
| 1151 | return err; |
| 1152 | |
| 1153 | e_addr: |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1154 | err = -EADDRNOTAVAIL; |
| 1155 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | e_inval: |
| 1157 | err = -EINVAL; |
| 1158 | goto done; |
| 1159 | e_nobufs: |
| 1160 | err = -ENOBUFS; |
| 1161 | goto done; |
| 1162 | e_neighbour: |
| 1163 | dst_free(&rt->u.dst); |
| 1164 | goto e_nobufs; |
| 1165 | } |
| 1166 | |
| 1167 | |
| 1168 | /* |
| 1169 | * N.B. The flags may be moved into the flowi at some future stage. |
| 1170 | */ |
| 1171 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) |
| 1172 | { |
| 1173 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); |
| 1174 | struct dn_route *rt = NULL; |
| 1175 | |
| 1176 | if (!(flags & MSG_TRYHARD)) { |
| 1177 | rcu_read_lock_bh(); |
| 1178 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 1179 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | if ((flp->fld_dst == rt->fl.fld_dst) && |
| 1181 | (flp->fld_src == rt->fl.fld_src) && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1182 | (flp->mark == rt->fl.mark) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | (rt->fl.iif == 0) && |
| 1184 | (rt->fl.oif == flp->oif)) { |
| 1185 | rt->u.dst.lastuse = jiffies; |
| 1186 | dst_hold(&rt->u.dst); |
| 1187 | rt->u.dst.__use++; |
| 1188 | rcu_read_unlock_bh(); |
| 1189 | *pprt = &rt->u.dst; |
| 1190 | return 0; |
| 1191 | } |
| 1192 | } |
| 1193 | rcu_read_unlock_bh(); |
| 1194 | } |
| 1195 | |
| 1196 | return dn_route_output_slow(pprt, flp, flags); |
| 1197 | } |
| 1198 | |
| 1199 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) |
| 1200 | { |
| 1201 | int err; |
| 1202 | |
| 1203 | err = __dn_route_output_key(pprt, flp, flags); |
| 1204 | if (err == 0 && flp->proto) { |
| 1205 | err = xfrm_lookup(pprt, flp, NULL, 0); |
| 1206 | } |
| 1207 | return err; |
| 1208 | } |
| 1209 | |
| 1210 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) |
| 1211 | { |
| 1212 | int err; |
| 1213 | |
| 1214 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); |
| 1215 | if (err == 0 && fl->proto) { |
| 1216 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); |
| 1217 | } |
| 1218 | return err; |
| 1219 | } |
| 1220 | |
| 1221 | static int dn_route_input_slow(struct sk_buff *skb) |
| 1222 | { |
| 1223 | struct dn_route *rt = NULL; |
| 1224 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 1225 | struct net_device *in_dev = skb->dev; |
| 1226 | struct net_device *out_dev = NULL; |
| 1227 | struct dn_dev *dn_db; |
| 1228 | struct neighbour *neigh = NULL; |
| 1229 | unsigned hash; |
| 1230 | int flags = 0; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 1231 | __le16 gateway = 0; |
| 1232 | __le16 local_src = 0; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1233 | struct flowi fl = { .nl_u = { .dn_u = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | { .daddr = cb->dst, |
| 1235 | .saddr = cb->src, |
| 1236 | .scope = RT_SCOPE_UNIVERSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1238 | .mark = skb->mark, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | .iif = skb->dev->ifindex }; |
| 1240 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
| 1241 | int err = -EINVAL; |
| 1242 | int free_res = 0; |
| 1243 | |
| 1244 | dev_hold(in_dev); |
| 1245 | |
| 1246 | if ((dn_db = in_dev->dn_ptr) == NULL) |
| 1247 | goto out; |
| 1248 | |
| 1249 | /* Zero source addresses are not allowed */ |
| 1250 | if (fl.fld_src == 0) |
| 1251 | goto out; |
| 1252 | |
| 1253 | /* |
| 1254 | * In this case we've just received a packet from a source |
| 1255 | * outside ourselves pretending to come from us. We don't |
| 1256 | * allow it any further to prevent routing loops, spoofing and |
| 1257 | * other nasties. Loopback packets already have the dst attached |
| 1258 | * so this only affects packets which have originated elsewhere. |
| 1259 | */ |
| 1260 | err = -ENOTUNIQ; |
| 1261 | if (dn_dev_islocal(in_dev, cb->src)) |
| 1262 | goto out; |
| 1263 | |
| 1264 | err = dn_fib_lookup(&fl, &res); |
| 1265 | if (err) { |
| 1266 | if (err != -ESRCH) |
| 1267 | goto out; |
| 1268 | /* |
| 1269 | * Is the destination us ? |
| 1270 | */ |
| 1271 | if (!dn_dev_islocal(in_dev, cb->dst)) |
| 1272 | goto e_inval; |
| 1273 | |
| 1274 | res.type = RTN_LOCAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | } else { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 1276 | __le16 src_map = fl.fld_src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | free_res = 1; |
| 1278 | |
| 1279 | out_dev = DN_FIB_RES_DEV(res); |
| 1280 | if (out_dev == NULL) { |
| 1281 | if (net_ratelimit()) |
| 1282 | printk(KERN_CRIT "Bug in dn_route_input_slow() " |
| 1283 | "No output device\n"); |
| 1284 | goto e_inval; |
| 1285 | } |
| 1286 | dev_hold(out_dev); |
| 1287 | |
| 1288 | if (res.r) |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 1289 | src_map = fl.fld_src; /* no NAT support for now */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | |
| 1291 | gateway = DN_FIB_RES_GW(res); |
| 1292 | if (res.type == RTN_NAT) { |
| 1293 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); |
| 1294 | dn_fib_res_put(&res); |
| 1295 | free_res = 0; |
| 1296 | if (dn_fib_lookup(&fl, &res)) |
| 1297 | goto e_inval; |
| 1298 | free_res = 1; |
| 1299 | if (res.type != RTN_UNICAST) |
| 1300 | goto e_inval; |
| 1301 | flags |= RTCF_DNAT; |
| 1302 | gateway = fl.fld_dst; |
| 1303 | } |
| 1304 | fl.fld_src = src_map; |
| 1305 | } |
| 1306 | |
| 1307 | switch(res.type) { |
| 1308 | case RTN_UNICAST: |
| 1309 | /* |
| 1310 | * Forwarding check here, we only check for forwarding |
| 1311 | * being turned off, if you want to only forward intra |
| 1312 | * area, its up to you to set the routing tables up |
| 1313 | * correctly. |
| 1314 | */ |
| 1315 | if (dn_db->parms.forwarding == 0) |
| 1316 | goto e_inval; |
| 1317 | |
| 1318 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 1319 | dn_fib_select_multipath(&fl, &res); |
| 1320 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1321 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
| 1323 | * flag as a hint to set the intra-ethernet bit when |
| 1324 | * forwarding. If we've got NAT in operation, we don't do |
| 1325 | * this optimisation. |
| 1326 | */ |
| 1327 | if (out_dev == in_dev && !(flags & RTCF_NAT)) |
| 1328 | flags |= RTCF_DOREDIRECT; |
| 1329 | |
| 1330 | local_src = DN_FIB_RES_PREFSRC(res); |
| 1331 | |
| 1332 | case RTN_BLACKHOLE: |
| 1333 | case RTN_UNREACHABLE: |
| 1334 | break; |
| 1335 | case RTN_LOCAL: |
| 1336 | flags |= RTCF_LOCAL; |
| 1337 | fl.fld_src = cb->dst; |
| 1338 | fl.fld_dst = cb->src; |
| 1339 | |
| 1340 | /* Routing tables gave us a gateway */ |
| 1341 | if (gateway) |
| 1342 | goto make_route; |
| 1343 | |
| 1344 | /* Packet was intra-ethernet, so we know its on-link */ |
Steven Whitehouse | 3a31b9d | 2006-10-18 20:45:22 -0700 | [diff] [blame] | 1345 | if (cb->rt_flags & DN_RT_F_IE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | gateway = cb->src; |
| 1347 | flags |= RTCF_DIRECTSRC; |
| 1348 | goto make_route; |
| 1349 | } |
| 1350 | |
| 1351 | /* Use the default router if there is one */ |
| 1352 | neigh = neigh_clone(dn_db->router); |
| 1353 | if (neigh) { |
| 1354 | gateway = ((struct dn_neigh *)neigh)->addr; |
| 1355 | goto make_route; |
| 1356 | } |
| 1357 | |
| 1358 | /* Close eyes and pray */ |
| 1359 | gateway = cb->src; |
| 1360 | flags |= RTCF_DIRECTSRC; |
| 1361 | goto make_route; |
| 1362 | default: |
| 1363 | goto e_inval; |
| 1364 | } |
| 1365 | |
| 1366 | make_route: |
| 1367 | rt = dst_alloc(&dn_dst_ops); |
| 1368 | if (rt == NULL) |
| 1369 | goto e_nobufs; |
| 1370 | |
| 1371 | rt->rt_saddr = fl.fld_src; |
| 1372 | rt->rt_daddr = fl.fld_dst; |
| 1373 | rt->rt_gateway = fl.fld_dst; |
| 1374 | if (gateway) |
| 1375 | rt->rt_gateway = gateway; |
| 1376 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; |
| 1377 | |
| 1378 | rt->rt_dst_map = fl.fld_dst; |
| 1379 | rt->rt_src_map = fl.fld_src; |
| 1380 | |
| 1381 | rt->fl.fld_src = cb->src; |
| 1382 | rt->fl.fld_dst = cb->dst; |
| 1383 | rt->fl.oif = 0; |
| 1384 | rt->fl.iif = in_dev->ifindex; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1385 | rt->fl.mark = fl.mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | |
| 1387 | rt->u.dst.flags = DST_HOST; |
| 1388 | rt->u.dst.neighbour = neigh; |
| 1389 | rt->u.dst.dev = out_dev; |
| 1390 | rt->u.dst.lastuse = jiffies; |
| 1391 | rt->u.dst.output = dn_rt_bug; |
| 1392 | switch(res.type) { |
| 1393 | case RTN_UNICAST: |
| 1394 | rt->u.dst.input = dn_forward; |
| 1395 | break; |
| 1396 | case RTN_LOCAL: |
| 1397 | rt->u.dst.output = dn_output; |
| 1398 | rt->u.dst.input = dn_nsp_rx; |
| 1399 | rt->u.dst.dev = in_dev; |
| 1400 | flags |= RTCF_LOCAL; |
| 1401 | break; |
| 1402 | default: |
| 1403 | case RTN_UNREACHABLE: |
| 1404 | case RTN_BLACKHOLE: |
| 1405 | rt->u.dst.input = dn_blackhole; |
| 1406 | } |
| 1407 | rt->rt_flags = flags; |
| 1408 | if (rt->u.dst.dev) |
| 1409 | dev_hold(rt->u.dst.dev); |
| 1410 | |
| 1411 | err = dn_rt_set_next_hop(rt, &res); |
| 1412 | if (err) |
| 1413 | goto e_neighbour; |
| 1414 | |
| 1415 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
| 1416 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); |
| 1417 | |
| 1418 | done: |
| 1419 | if (neigh) |
| 1420 | neigh_release(neigh); |
| 1421 | if (free_res) |
| 1422 | dn_fib_res_put(&res); |
| 1423 | dev_put(in_dev); |
| 1424 | if (out_dev) |
| 1425 | dev_put(out_dev); |
| 1426 | out: |
| 1427 | return err; |
| 1428 | |
| 1429 | e_inval: |
| 1430 | err = -EINVAL; |
| 1431 | goto done; |
| 1432 | |
| 1433 | e_nobufs: |
| 1434 | err = -ENOBUFS; |
| 1435 | goto done; |
| 1436 | |
| 1437 | e_neighbour: |
| 1438 | dst_free(&rt->u.dst); |
| 1439 | goto done; |
| 1440 | } |
| 1441 | |
| 1442 | int dn_route_input(struct sk_buff *skb) |
| 1443 | { |
| 1444 | struct dn_route *rt; |
| 1445 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
| 1446 | unsigned hash = dn_hash(cb->src, cb->dst); |
| 1447 | |
| 1448 | if (skb->dst) |
| 1449 | return 0; |
| 1450 | |
| 1451 | rcu_read_lock(); |
| 1452 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 1453 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | if ((rt->fl.fld_src == cb->src) && |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1455 | (rt->fl.fld_dst == cb->dst) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | (rt->fl.oif == 0) && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1457 | (rt->fl.mark == skb->mark) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | (rt->fl.iif == cb->iif)) { |
| 1459 | rt->u.dst.lastuse = jiffies; |
| 1460 | dst_hold(&rt->u.dst); |
| 1461 | rt->u.dst.__use++; |
| 1462 | rcu_read_unlock(); |
| 1463 | skb->dst = (struct dst_entry *)rt; |
| 1464 | return 0; |
| 1465 | } |
| 1466 | } |
| 1467 | rcu_read_unlock(); |
| 1468 | |
| 1469 | return dn_route_input_slow(skb); |
| 1470 | } |
| 1471 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1472 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 1473 | int event, int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | { |
| 1475 | struct dn_route *rt = (struct dn_route *)skb->dst; |
| 1476 | struct rtmsg *r; |
| 1477 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1478 | unsigned char *b = skb_tail_pointer(skb); |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 1479 | long expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1481 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | r = NLMSG_DATA(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | r->rtm_family = AF_DECnet; |
| 1484 | r->rtm_dst_len = 16; |
| 1485 | r->rtm_src_len = 0; |
| 1486 | r->rtm_tos = 0; |
| 1487 | r->rtm_table = RT_TABLE_MAIN; |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 1488 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | r->rtm_type = rt->rt_type; |
| 1490 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 1491 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 1492 | r->rtm_protocol = RTPROT_UNSPEC; |
| 1493 | if (rt->rt_flags & RTCF_NOTIFY) |
| 1494 | r->rtm_flags |= RTM_F_NOTIFY; |
| 1495 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); |
| 1496 | if (rt->fl.fld_src) { |
| 1497 | r->rtm_src_len = 16; |
| 1498 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); |
| 1499 | } |
| 1500 | if (rt->u.dst.dev) |
| 1501 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); |
| 1502 | /* |
| 1503 | * Note to self - change this if input routes reverse direction when |
| 1504 | * they deal only with inputs and not with replies like they do |
| 1505 | * currently. |
| 1506 | */ |
| 1507 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); |
| 1508 | if (rt->rt_daddr != rt->rt_gateway) |
| 1509 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); |
| 1510 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
| 1511 | goto rtattr_failure; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 1512 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; |
| 1513 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires, |
| 1514 | rt->u.dst.error) < 0) |
| 1515 | goto rtattr_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | if (rt->fl.iif) |
| 1517 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); |
| 1518 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1519 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | return skb->len; |
| 1521 | |
| 1522 | nlmsg_failure: |
| 1523 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1524 | nlmsg_trim(skb, b); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1525 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | } |
| 1527 | |
| 1528 | /* |
| 1529 | * This is called by both endnodes and routers now. |
| 1530 | */ |
Thomas Graf | fa34ddd | 2007-03-22 11:57:46 -0700 | [diff] [blame] | 1531 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | { |
| 1533 | struct rtattr **rta = arg; |
| 1534 | struct rtmsg *rtm = NLMSG_DATA(nlh); |
| 1535 | struct dn_route *rt = NULL; |
| 1536 | struct dn_skb_cb *cb; |
| 1537 | int err; |
| 1538 | struct sk_buff *skb; |
| 1539 | struct flowi fl; |
| 1540 | |
| 1541 | memset(&fl, 0, sizeof(fl)); |
| 1542 | fl.proto = DNPROTO_NSP; |
| 1543 | |
| 1544 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1545 | if (skb == NULL) |
| 1546 | return -ENOBUFS; |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1547 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | cb = DN_SKB_CB(skb); |
| 1549 | |
| 1550 | if (rta[RTA_SRC-1]) |
| 1551 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); |
| 1552 | if (rta[RTA_DST-1]) |
| 1553 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); |
| 1554 | if (rta[RTA_IIF-1]) |
| 1555 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
| 1556 | |
| 1557 | if (fl.iif) { |
| 1558 | struct net_device *dev; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1559 | if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | kfree_skb(skb); |
| 1561 | return -ENODEV; |
| 1562 | } |
| 1563 | if (!dev->dn_ptr) { |
| 1564 | dev_put(dev); |
| 1565 | kfree_skb(skb); |
| 1566 | return -ENODEV; |
| 1567 | } |
| 1568 | skb->protocol = __constant_htons(ETH_P_DNA_RT); |
| 1569 | skb->dev = dev; |
| 1570 | cb->src = fl.fld_src; |
| 1571 | cb->dst = fl.fld_dst; |
| 1572 | local_bh_disable(); |
| 1573 | err = dn_route_input(skb); |
| 1574 | local_bh_enable(); |
| 1575 | memset(cb, 0, sizeof(struct dn_skb_cb)); |
| 1576 | rt = (struct dn_route *)skb->dst; |
| 1577 | if (!err && -rt->u.dst.error) |
| 1578 | err = rt->u.dst.error; |
| 1579 | } else { |
| 1580 | int oif = 0; |
| 1581 | if (rta[RTA_OIF - 1]) |
| 1582 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); |
| 1583 | fl.oif = oif; |
| 1584 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); |
| 1585 | } |
| 1586 | |
| 1587 | if (skb->dev) |
| 1588 | dev_put(skb->dev); |
| 1589 | skb->dev = NULL; |
| 1590 | if (err) |
| 1591 | goto out_free; |
| 1592 | skb->dst = &rt->u.dst; |
| 1593 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 1594 | rt->rt_flags |= RTCF_NOTIFY; |
| 1595 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1596 | 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] | 1597 | |
| 1598 | if (err == 0) |
| 1599 | goto out_free; |
| 1600 | if (err < 0) { |
| 1601 | err = -EMSGSIZE; |
| 1602 | goto out_free; |
| 1603 | } |
| 1604 | |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 1605 | return rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
| 1607 | out_free: |
| 1608 | kfree_skb(skb); |
| 1609 | return err; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * For routers, this is called from dn_fib_dump, but for endnodes its |
| 1614 | * called directly from the rtnetlink dispatch table. |
| 1615 | */ |
| 1616 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1617 | { |
| 1618 | struct dn_route *rt; |
| 1619 | int h, s_h; |
| 1620 | int idx, s_idx; |
| 1621 | |
| 1622 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
| 1623 | return -EINVAL; |
| 1624 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) |
| 1625 | return 0; |
| 1626 | |
| 1627 | s_h = cb->args[0]; |
| 1628 | s_idx = idx = cb->args[1]; |
| 1629 | for(h = 0; h <= dn_rt_hash_mask; h++) { |
| 1630 | if (h < s_h) |
| 1631 | continue; |
| 1632 | if (h > s_h) |
| 1633 | s_idx = 0; |
| 1634 | rcu_read_lock_bh(); |
| 1635 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; |
| 1636 | rt; |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 1637 | rt = rcu_dereference(rt->u.dst.dn_next), idx++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | if (idx < s_idx) |
| 1639 | continue; |
| 1640 | skb->dst = dst_clone(&rt->u.dst); |
| 1641 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1642 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1643 | 1, NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | dst_release(xchg(&skb->dst, NULL)); |
| 1645 | rcu_read_unlock_bh(); |
| 1646 | goto done; |
| 1647 | } |
| 1648 | dst_release(xchg(&skb->dst, NULL)); |
| 1649 | } |
| 1650 | rcu_read_unlock_bh(); |
| 1651 | } |
| 1652 | |
| 1653 | done: |
| 1654 | cb->args[0] = h; |
| 1655 | cb->args[1] = idx; |
| 1656 | return skb->len; |
| 1657 | } |
| 1658 | |
| 1659 | #ifdef CONFIG_PROC_FS |
| 1660 | struct dn_rt_cache_iter_state { |
| 1661 | int bucket; |
| 1662 | }; |
| 1663 | |
| 1664 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) |
| 1665 | { |
| 1666 | struct dn_route *rt = NULL; |
| 1667 | struct dn_rt_cache_iter_state *s = seq->private; |
| 1668 | |
| 1669 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { |
| 1670 | rcu_read_lock_bh(); |
| 1671 | rt = dn_rt_hash_table[s->bucket].chain; |
| 1672 | if (rt) |
| 1673 | break; |
| 1674 | rcu_read_unlock_bh(); |
| 1675 | } |
| 1676 | return rt; |
| 1677 | } |
| 1678 | |
| 1679 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) |
| 1680 | { |
| 1681 | struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); |
| 1682 | |
Eric Dumazet | 0c195c3 | 2007-02-09 16:25:52 -0800 | [diff] [blame] | 1683 | rt = rt->u.dst.dn_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | while(!rt) { |
| 1685 | rcu_read_unlock_bh(); |
| 1686 | if (--s->bucket < 0) |
| 1687 | break; |
| 1688 | rcu_read_lock_bh(); |
| 1689 | rt = dn_rt_hash_table[s->bucket].chain; |
| 1690 | } |
| 1691 | return rt; |
| 1692 | } |
| 1693 | |
| 1694 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 1695 | { |
| 1696 | struct dn_route *rt = dn_rt_cache_get_first(seq); |
| 1697 | |
| 1698 | if (rt) { |
| 1699 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) |
| 1700 | --*pos; |
| 1701 | } |
| 1702 | return *pos ? NULL : rt; |
| 1703 | } |
| 1704 | |
| 1705 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1706 | { |
| 1707 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); |
| 1708 | ++*pos; |
| 1709 | return rt; |
| 1710 | } |
| 1711 | |
| 1712 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 1713 | { |
| 1714 | if (v) |
| 1715 | rcu_read_unlock_bh(); |
| 1716 | } |
| 1717 | |
| 1718 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) |
| 1719 | { |
| 1720 | struct dn_route *rt = v; |
| 1721 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; |
| 1722 | |
| 1723 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", |
| 1724 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", |
| 1725 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), |
| 1726 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), |
| 1727 | atomic_read(&rt->u.dst.__refcnt), |
| 1728 | rt->u.dst.__use, |
| 1729 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); |
| 1730 | return 0; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1731 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 1733 | static const struct seq_operations dn_rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | .start = dn_rt_cache_seq_start, |
| 1735 | .next = dn_rt_cache_seq_next, |
| 1736 | .stop = dn_rt_cache_seq_stop, |
| 1737 | .show = dn_rt_cache_seq_show, |
| 1738 | }; |
| 1739 | |
| 1740 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) |
| 1741 | { |
Pavel Emelyanov | 3116408 | 2007-10-10 02:30:23 -0700 | [diff] [blame] | 1742 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
| 1743 | sizeof(struct dn_rt_cache_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | } |
| 1745 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 1746 | static const struct file_operations dn_rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | .owner = THIS_MODULE, |
| 1748 | .open = dn_rt_cache_seq_open, |
| 1749 | .read = seq_read, |
| 1750 | .llseek = seq_lseek, |
| 1751 | .release = seq_release_private, |
| 1752 | }; |
| 1753 | |
| 1754 | #endif /* CONFIG_PROC_FS */ |
| 1755 | |
| 1756 | void __init dn_route_init(void) |
| 1757 | { |
| 1758 | int i, goal, order; |
| 1759 | |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 1760 | dn_dst_ops.kmem_cachep = |
| 1761 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1762 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | init_timer(&dn_route_timer); |
| 1764 | dn_route_timer.function = dn_dst_check_expire; |
| 1765 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
| 1766 | add_timer(&dn_route_timer); |
| 1767 | |
| 1768 | goal = num_physpages >> (26 - PAGE_SHIFT); |
| 1769 | |
| 1770 | for(order = 0; (1UL << order) < goal; order++) |
| 1771 | /* NOTHING */; |
| 1772 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1773 | /* |
| 1774 | * Only want 1024 entries max, since the table is very, very unlikely |
| 1775 | * to be larger than that. |
| 1776 | */ |
| 1777 | while(order && ((((1UL << order) * PAGE_SIZE) / |
| 1778 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) |
| 1779 | order--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1781 | do { |
| 1782 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / |
| 1783 | sizeof(struct dn_rt_hash_bucket); |
| 1784 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) |
| 1785 | dn_rt_hash_mask--; |
| 1786 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) |
| 1787 | __get_free_pages(GFP_ATOMIC, order); |
| 1788 | } while (dn_rt_hash_table == NULL && --order > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | |
| 1790 | if (!dn_rt_hash_table) |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1791 | panic("Failed to allocate DECnet route cache hash table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1793 | printk(KERN_INFO |
| 1794 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", |
| 1795 | dn_rt_hash_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
| 1797 | |
| 1798 | dn_rt_hash_mask--; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1799 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
| 1800 | spin_lock_init(&dn_rt_hash_table[i].lock); |
| 1801 | dn_rt_hash_table[i].chain = NULL; |
| 1802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 1804 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1806 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
Thomas Graf | fa34ddd | 2007-03-22 11:57:46 -0700 | [diff] [blame] | 1807 | |
| 1808 | #ifdef CONFIG_DECNET_ROUTER |
| 1809 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); |
| 1810 | #else |
| 1811 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
| 1812 | dn_cache_dump); |
| 1813 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | } |
| 1815 | |
| 1816 | void __exit dn_route_cleanup(void) |
| 1817 | { |
| 1818 | del_timer(&dn_route_timer); |
| 1819 | dn_run_flush(0); |
| 1820 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1821 | proc_net_remove(&init_net, "decnet_cache"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | } |
| 1823 | |