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 Forwarding Information Base (Routing Tables) |
| 7 | * |
| 8 | * Author: Steve Whitehouse <SteveW@ACM.org> |
| 9 | * Mostly copied from the IPv4 routing code |
| 10 | * |
| 11 | * |
| 12 | * Changes: |
| 13 | * |
| 14 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/string.h> |
| 16 | #include <linux/net.h> |
| 17 | #include <linux/socket.h> |
| 18 | #include <linux/sockios.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/netlink.h> |
| 22 | #include <linux/rtnetlink.h> |
| 23 | #include <linux/proc_fs.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/timer.h> |
| 26 | #include <linux/spinlock.h> |
| 27 | #include <asm/atomic.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <linux/route.h> /* RTF_xxx */ |
| 30 | #include <net/neighbour.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 31 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <net/dst.h> |
| 33 | #include <net/flow.h> |
Steven Whitehouse | a8731cb | 2006-08-09 15:56:46 -0700 | [diff] [blame] | 34 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/dn.h> |
| 36 | #include <net/dn_route.h> |
| 37 | #include <net/dn_fib.h> |
| 38 | #include <net/dn_neigh.h> |
| 39 | #include <net/dn_dev.h> |
| 40 | |
| 41 | struct dn_zone |
| 42 | { |
| 43 | struct dn_zone *dz_next; |
| 44 | struct dn_fib_node **dz_hash; |
| 45 | int dz_nent; |
| 46 | int dz_divisor; |
| 47 | u32 dz_hashmask; |
| 48 | #define DZ_HASHMASK(dz) ((dz)->dz_hashmask) |
| 49 | int dz_order; |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 50 | __le16 dz_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #define DZ_MASK(dz) ((dz)->dz_mask) |
| 52 | }; |
| 53 | |
| 54 | struct dn_hash |
| 55 | { |
| 56 | struct dn_zone *dh_zones[17]; |
| 57 | struct dn_zone *dh_zone_list; |
| 58 | }; |
| 59 | |
| 60 | #define dz_key_0(key) ((key).datum = 0) |
| 61 | #define dz_prefix(key,dz) ((key).datum) |
| 62 | |
| 63 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 64 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | #define endfor_nexthops(fi) } |
| 67 | |
| 68 | #define DN_MAX_DIVISOR 1024 |
| 69 | #define DN_S_ZOMBIE 1 |
| 70 | #define DN_S_ACCESSED 2 |
| 71 | |
| 72 | #define DN_FIB_SCAN(f, fp) \ |
| 73 | for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next) |
| 74 | |
| 75 | #define DN_FIB_SCAN_KEY(f, fp, key) \ |
| 76 | for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next) |
| 77 | |
| 78 | #define RT_TABLE_MIN 1 |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 79 | #define DN_FIB_TABLE_HASHSZ 256 |
| 80 | static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static DEFINE_RWLOCK(dn_fib_tables_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 83 | static struct kmem_cache *dn_hash_kmem __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | static int dn_fib_hash_zombies; |
| 85 | |
| 86 | static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz) |
| 87 | { |
Harvey Harrison | c4106aa | 2008-11-27 00:12:47 -0800 | [diff] [blame] | 88 | u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | h ^= (h >> 10); |
| 90 | h ^= (h >> 6); |
| 91 | h &= DZ_HASHMASK(dz); |
| 92 | return *(dn_fib_idx_t *)&h; |
| 93 | } |
| 94 | |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 95 | static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | dn_fib_key_t k; |
| 98 | k.datum = dst & DZ_MASK(dz); |
| 99 | return k; |
| 100 | } |
| 101 | |
| 102 | static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz) |
| 103 | { |
| 104 | return &dz->dz_hash[dn_hash(key, dz).datum]; |
| 105 | } |
| 106 | |
| 107 | static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz) |
| 108 | { |
| 109 | return dz->dz_hash[dn_hash(key, dz).datum]; |
| 110 | } |
| 111 | |
| 112 | static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b) |
| 113 | { |
| 114 | return a.datum == b.datum; |
| 115 | } |
| 116 | |
| 117 | static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b) |
| 118 | { |
| 119 | return a.datum <= b.datum; |
| 120 | } |
| 121 | |
| 122 | static inline void dn_rebuild_zone(struct dn_zone *dz, |
| 123 | struct dn_fib_node **old_ht, |
| 124 | int old_divisor) |
| 125 | { |
| 126 | int i; |
| 127 | struct dn_fib_node *f, **fp, *next; |
| 128 | |
| 129 | for(i = 0; i < old_divisor; i++) { |
| 130 | for(f = old_ht[i]; f; f = f->fn_next) { |
| 131 | next = f->fn_next; |
| 132 | for(fp = dn_chain_p(f->fn_key, dz); |
| 133 | *fp && dn_key_leq((*fp)->fn_key, f->fn_key); |
| 134 | fp = &(*fp)->fn_next) |
| 135 | /* NOTHING */; |
| 136 | f->fn_next = *fp; |
| 137 | *fp = f; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | static void dn_rehash_zone(struct dn_zone *dz) |
| 143 | { |
| 144 | struct dn_fib_node **ht, **old_ht; |
| 145 | int old_divisor, new_divisor; |
| 146 | u32 new_hashmask; |
| 147 | |
| 148 | old_divisor = dz->dz_divisor; |
| 149 | |
| 150 | switch(old_divisor) { |
| 151 | case 16: |
| 152 | new_divisor = 256; |
| 153 | new_hashmask = 0xFF; |
| 154 | break; |
| 155 | default: |
| 156 | printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor); |
| 157 | case 256: |
| 158 | new_divisor = 1024; |
| 159 | new_hashmask = 0x3FF; |
| 160 | break; |
| 161 | } |
| 162 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 163 | ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | if (ht == NULL) |
| 165 | return; |
| 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | write_lock_bh(&dn_fib_tables_lock); |
| 168 | old_ht = dz->dz_hash; |
| 169 | dz->dz_hash = ht; |
| 170 | dz->dz_hashmask = new_hashmask; |
| 171 | dz->dz_divisor = new_divisor; |
| 172 | dn_rebuild_zone(dz, old_ht, old_divisor); |
| 173 | write_unlock_bh(&dn_fib_tables_lock); |
| 174 | kfree(old_ht); |
| 175 | } |
| 176 | |
| 177 | static void dn_free_node(struct dn_fib_node *f) |
| 178 | { |
| 179 | dn_fib_release_info(DN_FIB_INFO(f)); |
| 180 | kmem_cache_free(dn_hash_kmem, f); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | static struct dn_zone *dn_new_zone(struct dn_hash *table, int z) |
| 185 | { |
| 186 | int i; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 187 | struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | if (!dz) |
| 189 | return NULL; |
| 190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (z) { |
| 192 | dz->dz_divisor = 16; |
| 193 | dz->dz_hashmask = 0x0F; |
| 194 | } else { |
| 195 | dz->dz_divisor = 1; |
| 196 | dz->dz_hashmask = 0; |
| 197 | } |
| 198 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 199 | dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | if (!dz->dz_hash) { |
| 201 | kfree(dz); |
| 202 | return NULL; |
| 203 | } |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | dz->dz_order = z; |
| 206 | dz->dz_mask = dnet_make_mask(z); |
| 207 | |
| 208 | for(i = z + 1; i <= 16; i++) |
| 209 | if (table->dh_zones[i]) |
| 210 | break; |
| 211 | |
| 212 | write_lock_bh(&dn_fib_tables_lock); |
| 213 | if (i>16) { |
| 214 | dz->dz_next = table->dh_zone_list; |
| 215 | table->dh_zone_list = dz; |
| 216 | } else { |
| 217 | dz->dz_next = table->dh_zones[i]->dz_next; |
| 218 | table->dh_zones[i]->dz_next = dz; |
| 219 | } |
| 220 | table->dh_zones[z] = dz; |
| 221 | write_unlock_bh(&dn_fib_tables_lock); |
| 222 | return dz; |
| 223 | } |
| 224 | |
| 225 | |
| 226 | static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi) |
| 227 | { |
| 228 | struct rtnexthop *nhp; |
| 229 | int nhlen; |
| 230 | |
| 231 | if (rta->rta_priority && *rta->rta_priority != fi->fib_priority) |
| 232 | return 1; |
| 233 | |
| 234 | if (rta->rta_oif || rta->rta_gw) { |
| 235 | if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) && |
| 236 | (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0)) |
| 237 | return 0; |
| 238 | return 1; |
| 239 | } |
| 240 | |
| 241 | if (rta->rta_mp == NULL) |
| 242 | return 0; |
| 243 | |
| 244 | nhp = RTA_DATA(rta->rta_mp); |
| 245 | nhlen = RTA_PAYLOAD(rta->rta_mp); |
| 246 | |
| 247 | for_nexthops(fi) { |
| 248 | int attrlen = nhlen - sizeof(struct rtnexthop); |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 249 | __le16 gw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) |
| 252 | return -EINVAL; |
| 253 | if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif) |
| 254 | return 1; |
| 255 | if (attrlen) { |
| 256 | gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); |
| 257 | |
| 258 | if (gw && gw != nh->nh_gw) |
| 259 | return 1; |
| 260 | } |
| 261 | nhp = RTNH_NEXT(nhp); |
| 262 | } endfor_nexthops(fi); |
| 263 | |
| 264 | return 0; |
| 265 | } |
| 266 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 267 | static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) |
| 268 | { |
David S. Miller | 75356f2 | 2006-11-12 23:02:01 -0800 | [diff] [blame] | 269 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 270 | + nla_total_size(4) /* RTA_TABLE */ |
| 271 | + nla_total_size(2) /* RTA_DST */ |
| 272 | + nla_total_size(4); /* RTA_PRIORITY */ |
| 273 | |
| 274 | /* space for nested metrics */ |
| 275 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); |
| 276 | |
| 277 | if (fi->fib_nhs) { |
| 278 | /* Also handles the special case fib_nhs == 1 */ |
| 279 | |
| 280 | /* each nexthop is packed in an attribute */ |
| 281 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); |
| 282 | |
| 283 | /* may contain a gateway attribute */ |
| 284 | nhsize += nla_total_size(4); |
| 285 | |
| 286 | /* all nexthops are packed in a nested attribute */ |
| 287 | payload += nla_total_size(fi->fib_nhs * nhsize); |
| 288 | } |
| 289 | |
| 290 | return payload; |
| 291 | } |
| 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 294 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
| 295 | struct dn_fib_info *fi, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 297 | struct rtmsg *rtm; |
| 298 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 299 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 301 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags); |
| 302 | rtm = NLMSG_DATA(nlh); |
| 303 | rtm->rtm_family = AF_DECnet; |
| 304 | rtm->rtm_dst_len = dst_len; |
| 305 | rtm->rtm_src_len = 0; |
| 306 | rtm->rtm_tos = 0; |
| 307 | rtm->rtm_table = tb_id; |
Patrick McHardy | 9e762a4 | 2006-08-10 23:09:48 -0700 | [diff] [blame] | 308 | RTA_PUT_U32(skb, RTA_TABLE, tb_id); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 309 | rtm->rtm_flags = fi->fib_flags; |
| 310 | rtm->rtm_scope = scope; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | rtm->rtm_type = type; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 312 | if (rtm->rtm_dst_len) |
| 313 | RTA_PUT(skb, RTA_DST, 2, dst); |
| 314 | rtm->rtm_protocol = fi->fib_protocol; |
| 315 | if (fi->fib_priority) |
| 316 | RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
| 318 | goto rtattr_failure; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 319 | if (fi->fib_nhs == 1) { |
| 320 | if (fi->fib_nh->nh_gw) |
| 321 | RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw); |
| 322 | if (fi->fib_nh->nh_oif) |
| 323 | RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif); |
| 324 | } |
| 325 | if (fi->fib_nhs > 1) { |
| 326 | struct rtnexthop *nhp; |
| 327 | struct rtattr *mp_head; |
| 328 | if (skb_tailroom(skb) <= RTA_SPACE(0)) |
| 329 | goto rtattr_failure; |
| 330 | mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 332 | for_nexthops(fi) { |
| 333 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
| 334 | goto rtattr_failure; |
| 335 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
| 336 | nhp->rtnh_flags = nh->nh_flags & 0xFF; |
| 337 | nhp->rtnh_hops = nh->nh_weight - 1; |
| 338 | nhp->rtnh_ifindex = nh->nh_oif; |
| 339 | if (nh->nh_gw) |
| 340 | RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 341 | nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 342 | } endfor_nexthops(fi); |
| 343 | mp_head->rta_type = RTA_MULTIPATH; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 344 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 345 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 347 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 348 | return skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | |
| 351 | nlmsg_failure: |
| 352 | rtattr_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 353 | nlmsg_trim(skb, b); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 354 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 358 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 359 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 361 | struct sk_buff *skb; |
| 362 | u32 pid = req ? req->pid : 0; |
Thomas Graf | dc738dd | 2006-08-15 00:33:35 -0700 | [diff] [blame] | 363 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 365 | skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); |
| 366 | if (skb == NULL) |
Thomas Graf | dc738dd | 2006-08-15 00:33:35 -0700 | [diff] [blame] | 367 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 369 | err = dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id, |
Thomas Graf | dc738dd | 2006-08-15 00:33:35 -0700 | [diff] [blame] | 370 | f->fn_type, f->fn_scope, &f->fn_key, z, |
| 371 | DN_FIB_INFO(f), 0); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 372 | if (err < 0) { |
| 373 | /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */ |
| 374 | WARN_ON(err == -EMSGSIZE); |
| 375 | kfree_skb(skb); |
| 376 | goto errout; |
| 377 | } |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 378 | rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); |
| 379 | return; |
Thomas Graf | dc738dd | 2006-08-15 00:33:35 -0700 | [diff] [blame] | 380 | errout: |
| 381 | if (err < 0) |
Denis V. Lunev | 97c53ca | 2007-11-19 22:26:51 -0800 | [diff] [blame] | 382 | rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 385 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | struct netlink_callback *cb, |
| 387 | struct dn_fib_table *tb, |
| 388 | struct dn_zone *dz, |
| 389 | struct dn_fib_node *f) |
| 390 | { |
| 391 | int i, s_i; |
| 392 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 393 | s_i = cb->args[4]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | for(i = 0; f; i++, f = f->fn_next) { |
| 395 | if (i < s_i) |
| 396 | continue; |
| 397 | if (f->fn_state & DN_S_ZOMBIE) |
| 398 | continue; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 399 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | cb->nlh->nlmsg_seq, |
| 401 | RTM_NEWROUTE, |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 402 | tb->n, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 404 | f->fn_scope, &f->fn_key, dz->dz_order, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 405 | f->fn_info, NLM_F_MULTI) < 0) { |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 406 | cb->args[4] = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | return -1; |
| 408 | } |
| 409 | } |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 410 | cb->args[4] = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | return skb->len; |
| 412 | } |
| 413 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 414 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | struct netlink_callback *cb, |
| 416 | struct dn_fib_table *tb, |
| 417 | struct dn_zone *dz) |
| 418 | { |
| 419 | int h, s_h; |
| 420 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 421 | s_h = cb->args[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | for(h = 0; h < dz->dz_divisor; h++) { |
| 423 | if (h < s_h) |
| 424 | continue; |
| 425 | if (h > s_h) |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 426 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
| 428 | continue; |
| 429 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 430 | cb->args[3] = h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return -1; |
| 432 | } |
| 433 | } |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 434 | cb->args[3] = h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | return skb->len; |
| 436 | } |
| 437 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 438 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, |
| 439 | struct netlink_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 441 | int m, s_m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | struct dn_zone *dz; |
| 443 | struct dn_hash *table = (struct dn_hash *)tb->data; |
| 444 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 445 | s_m = cb->args[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | read_lock(&dn_fib_tables_lock); |
| 447 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { |
| 448 | if (m < s_m) |
| 449 | continue; |
| 450 | if (m > s_m) |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 451 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 454 | cb->args[2] = m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | read_unlock(&dn_fib_tables_lock); |
| 456 | return -1; |
| 457 | } |
| 458 | } |
| 459 | read_unlock(&dn_fib_tables_lock); |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 460 | cb->args[2] = m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 462 | return skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
| 464 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 465 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 466 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 467 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 468 | unsigned int h, s_h; |
| 469 | unsigned int e = 0, s_e; |
| 470 | struct dn_fib_table *tb; |
| 471 | struct hlist_node *node; |
| 472 | int dumped = 0; |
| 473 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 474 | if (!net_eq(net, &init_net)) |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 475 | return 0; |
| 476 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 477 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && |
| 478 | ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) |
| 479 | return dn_cache_dump(skb, cb); |
| 480 | |
| 481 | s_h = cb->args[0]; |
| 482 | s_e = cb->args[1]; |
| 483 | |
| 484 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { |
| 485 | e = 0; |
| 486 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) { |
| 487 | if (e < s_e) |
| 488 | goto next; |
| 489 | if (dumped) |
| 490 | memset(&cb->args[2], 0, sizeof(cb->args) - |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 491 | 2 * sizeof(cb->args[0])); |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 492 | if (tb->dump(tb, skb, cb) < 0) |
| 493 | goto out; |
| 494 | dumped = 1; |
| 495 | next: |
| 496 | e++; |
| 497 | } |
| 498 | } |
| 499 | out: |
| 500 | cb->args[1] = e; |
| 501 | cb->args[0] = h; |
| 502 | |
| 503 | return skb->len; |
| 504 | } |
| 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req) |
| 507 | { |
| 508 | struct dn_hash *table = (struct dn_hash *)tb->data; |
| 509 | struct dn_fib_node *new_f, *f, **fp, **del_fp; |
| 510 | struct dn_zone *dz; |
| 511 | struct dn_fib_info *fi; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 512 | int z = r->rtm_dst_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | int type = r->rtm_type; |
| 514 | dn_fib_key_t key; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 515 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 517 | if (z > 16) |
| 518 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | dz = table->dh_zones[z]; |
| 521 | if (!dz && !(dz = dn_new_zone(table, z))) |
| 522 | return -ENOBUFS; |
| 523 | |
| 524 | dz_key_0(key); |
| 525 | if (rta->rta_dst) { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 526 | __le16 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | memcpy(&dst, rta->rta_dst, 2); |
| 528 | if (dst & ~DZ_MASK(dz)) |
| 529 | return -EINVAL; |
| 530 | key = dz_key(dst, dz); |
| 531 | } |
| 532 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 533 | if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL) |
| 534 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | if (dz->dz_nent > (dz->dz_divisor << 2) && |
| 537 | dz->dz_divisor > DN_MAX_DIVISOR && |
| 538 | (z==16 || (1<<z) > dz->dz_divisor)) |
| 539 | dn_rehash_zone(dz); |
| 540 | |
| 541 | fp = dn_chain_p(key, dz); |
| 542 | |
| 543 | DN_FIB_SCAN(f, fp) { |
| 544 | if (dn_key_leq(key, f->fn_key)) |
| 545 | break; |
| 546 | } |
| 547 | |
| 548 | del_fp = NULL; |
| 549 | |
| 550 | if (f && (f->fn_state & DN_S_ZOMBIE) && |
| 551 | dn_key_eq(f->fn_key, key)) { |
| 552 | del_fp = fp; |
| 553 | fp = &f->fn_next; |
| 554 | f = *fp; |
| 555 | goto create; |
| 556 | } |
| 557 | |
| 558 | DN_FIB_SCAN_KEY(f, fp, key) { |
| 559 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) |
| 560 | break; |
| 561 | } |
| 562 | |
| 563 | if (f && dn_key_eq(f->fn_key, key) && |
| 564 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { |
| 565 | struct dn_fib_node **ins_fp; |
| 566 | |
| 567 | err = -EEXIST; |
| 568 | if (n->nlmsg_flags & NLM_F_EXCL) |
| 569 | goto out; |
| 570 | |
| 571 | if (n->nlmsg_flags & NLM_F_REPLACE) { |
| 572 | del_fp = fp; |
| 573 | fp = &f->fn_next; |
| 574 | f = *fp; |
| 575 | goto replace; |
| 576 | } |
| 577 | |
| 578 | ins_fp = fp; |
| 579 | err = -EEXIST; |
| 580 | |
| 581 | DN_FIB_SCAN_KEY(f, fp, key) { |
| 582 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) |
| 583 | break; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame^] | 584 | if (f->fn_type == type && |
| 585 | f->fn_scope == r->rtm_scope && |
| 586 | DN_FIB_INFO(f) == fi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | goto out; |
| 588 | } |
| 589 | |
| 590 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { |
| 591 | fp = ins_fp; |
| 592 | f = *fp; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | create: |
| 597 | err = -ENOENT; |
| 598 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
| 599 | goto out; |
| 600 | |
| 601 | replace: |
| 602 | err = -ENOBUFS; |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 603 | new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | if (new_f == NULL) |
| 605 | goto out; |
| 606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | new_f->fn_key = key; |
| 608 | new_f->fn_type = type; |
| 609 | new_f->fn_scope = r->rtm_scope; |
| 610 | DN_FIB_INFO(new_f) = fi; |
| 611 | |
| 612 | new_f->fn_next = f; |
| 613 | write_lock_bh(&dn_fib_tables_lock); |
| 614 | *fp = new_f; |
| 615 | write_unlock_bh(&dn_fib_tables_lock); |
| 616 | dz->dz_nent++; |
| 617 | |
| 618 | if (del_fp) { |
| 619 | f = *del_fp; |
| 620 | write_lock_bh(&dn_fib_tables_lock); |
| 621 | *del_fp = f->fn_next; |
| 622 | write_unlock_bh(&dn_fib_tables_lock); |
| 623 | |
| 624 | if (!(f->fn_state & DN_S_ZOMBIE)) |
| 625 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); |
| 626 | if (f->fn_state & DN_S_ACCESSED) |
| 627 | dn_rt_cache_flush(-1); |
| 628 | dn_free_node(f); |
| 629 | dz->dz_nent--; |
| 630 | } else { |
| 631 | dn_rt_cache_flush(-1); |
| 632 | } |
| 633 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 634 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 636 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | out: |
| 638 | dn_fib_release_info(fi); |
| 639 | return err; |
| 640 | } |
| 641 | |
| 642 | |
| 643 | static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req) |
| 644 | { |
| 645 | struct dn_hash *table = (struct dn_hash*)tb->data; |
| 646 | struct dn_fib_node **fp, **del_fp, *f; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 647 | int z = r->rtm_dst_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | struct dn_zone *dz; |
| 649 | dn_fib_key_t key; |
| 650 | int matched; |
| 651 | |
| 652 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 653 | if (z > 16) |
| 654 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | if ((dz = table->dh_zones[z]) == NULL) |
| 657 | return -ESRCH; |
| 658 | |
| 659 | dz_key_0(key); |
| 660 | if (rta->rta_dst) { |
Steven Whitehouse | c4ea94a | 2006-03-20 22:42:39 -0800 | [diff] [blame] | 661 | __le16 dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | memcpy(&dst, rta->rta_dst, 2); |
| 663 | if (dst & ~DZ_MASK(dz)) |
| 664 | return -EINVAL; |
| 665 | key = dz_key(dst, dz); |
| 666 | } |
| 667 | |
| 668 | fp = dn_chain_p(key, dz); |
| 669 | |
| 670 | DN_FIB_SCAN(f, fp) { |
| 671 | if (dn_key_eq(f->fn_key, key)) |
| 672 | break; |
| 673 | if (dn_key_leq(key, f->fn_key)) |
| 674 | return -ESRCH; |
| 675 | } |
| 676 | |
| 677 | matched = 0; |
| 678 | del_fp = NULL; |
| 679 | DN_FIB_SCAN_KEY(f, fp, key) { |
| 680 | struct dn_fib_info *fi = DN_FIB_INFO(f); |
| 681 | |
| 682 | if (f->fn_state & DN_S_ZOMBIE) |
| 683 | return -ESRCH; |
| 684 | |
| 685 | matched++; |
| 686 | |
| 687 | if (del_fp == NULL && |
| 688 | (!r->rtm_type || f->fn_type == r->rtm_type) && |
| 689 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 690 | (!r->rtm_protocol || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | fi->fib_protocol == r->rtm_protocol) && |
| 692 | dn_fib_nh_match(r, n, rta, fi) == 0) |
| 693 | del_fp = fp; |
| 694 | } |
| 695 | |
| 696 | if (del_fp) { |
| 697 | f = *del_fp; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 698 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | if (matched != 1) { |
| 701 | write_lock_bh(&dn_fib_tables_lock); |
| 702 | *del_fp = f->fn_next; |
| 703 | write_unlock_bh(&dn_fib_tables_lock); |
| 704 | |
| 705 | if (f->fn_state & DN_S_ACCESSED) |
| 706 | dn_rt_cache_flush(-1); |
| 707 | dn_free_node(f); |
| 708 | dz->dz_nent--; |
| 709 | } else { |
| 710 | f->fn_state |= DN_S_ZOMBIE; |
| 711 | if (f->fn_state & DN_S_ACCESSED) { |
| 712 | f->fn_state &= ~DN_S_ACCESSED; |
| 713 | dn_rt_cache_flush(-1); |
| 714 | } |
| 715 | if (++dn_fib_hash_zombies > 128) |
| 716 | dn_fib_flush(); |
| 717 | } |
| 718 | |
| 719 | return 0; |
| 720 | } |
| 721 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 722 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
| 724 | |
| 725 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) |
| 726 | { |
| 727 | int found = 0; |
| 728 | struct dn_fib_node *f; |
| 729 | |
| 730 | while((f = *fp) != NULL) { |
| 731 | struct dn_fib_info *fi = DN_FIB_INFO(f); |
| 732 | |
| 733 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { |
| 734 | write_lock_bh(&dn_fib_tables_lock); |
| 735 | *fp = f->fn_next; |
| 736 | write_unlock_bh(&dn_fib_tables_lock); |
| 737 | |
| 738 | dn_free_node(f); |
| 739 | found++; |
| 740 | continue; |
| 741 | } |
| 742 | fp = &f->fn_next; |
| 743 | } |
| 744 | |
| 745 | return found; |
| 746 | } |
| 747 | |
| 748 | static int dn_fib_table_flush(struct dn_fib_table *tb) |
| 749 | { |
| 750 | struct dn_hash *table = (struct dn_hash *)tb->data; |
| 751 | struct dn_zone *dz; |
| 752 | int found = 0; |
| 753 | |
| 754 | dn_fib_hash_zombies = 0; |
| 755 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { |
| 756 | int i; |
| 757 | int tmp = 0; |
| 758 | for(i = dz->dz_divisor-1; i >= 0; i--) |
| 759 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); |
| 760 | dz->dz_nent -= tmp; |
| 761 | found += tmp; |
| 762 | } |
| 763 | |
| 764 | return found; |
| 765 | } |
| 766 | |
| 767 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res) |
| 768 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 769 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | struct dn_zone *dz; |
| 771 | struct dn_hash *t = (struct dn_hash *)tb->data; |
| 772 | |
| 773 | read_lock(&dn_fib_tables_lock); |
| 774 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { |
| 775 | struct dn_fib_node *f; |
| 776 | dn_fib_key_t k = dz_key(flp->fld_dst, dz); |
| 777 | |
| 778 | for(f = dz_chain(k, dz); f; f = f->fn_next) { |
| 779 | if (!dn_key_eq(k, f->fn_key)) { |
| 780 | if (dn_key_leq(k, f->fn_key)) |
| 781 | break; |
| 782 | else |
| 783 | continue; |
| 784 | } |
| 785 | |
| 786 | f->fn_state |= DN_S_ACCESSED; |
| 787 | |
| 788 | if (f->fn_state&DN_S_ZOMBIE) |
| 789 | continue; |
| 790 | |
| 791 | if (f->fn_scope < flp->fld_scope) |
| 792 | continue; |
| 793 | |
| 794 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); |
| 795 | |
| 796 | if (err == 0) { |
| 797 | res->type = f->fn_type; |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 798 | res->scope = f->fn_scope; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | res->prefixlen = dz->dz_order; |
| 800 | goto out; |
| 801 | } |
| 802 | if (err < 0) |
| 803 | goto out; |
| 804 | } |
| 805 | } |
| 806 | err = 1; |
| 807 | out: |
| 808 | read_unlock(&dn_fib_tables_lock); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 809 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 813 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 815 | struct dn_fib_table *t; |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 816 | struct hlist_node *node; |
| 817 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 819 | if (n < RT_TABLE_MIN) |
| 820 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 822 | if (n > RT_TABLE_MAX) |
| 823 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 825 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
| 826 | rcu_read_lock(); |
| 827 | hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) { |
| 828 | if (t->n == n) { |
| 829 | rcu_read_unlock(); |
| 830 | return t; |
| 831 | } |
| 832 | } |
| 833 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 835 | if (!create) |
| 836 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 838 | if (in_interrupt() && net_ratelimit()) { |
| 839 | printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n"); |
| 840 | return NULL; |
| 841 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 843 | t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), |
Arnaldo Carvalho de Melo | e6b6110 | 2006-11-21 01:16:24 -0200 | [diff] [blame] | 844 | GFP_KERNEL); |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 845 | if (t == NULL) |
| 846 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 848 | t->n = n; |
| 849 | t->insert = dn_fib_table_insert; |
| 850 | t->delete = dn_fib_table_delete; |
| 851 | t->lookup = dn_fib_table_lookup; |
| 852 | t->flush = dn_fib_table_flush; |
| 853 | t->dump = dn_fib_table_dump; |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 854 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 856 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
| 858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | struct dn_fib_table *dn_fib_empty_table(void) |
| 860 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 861 | u32 id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 863 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 864 | if (dn_fib_get_table(id, 0) == NULL) |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 865 | return dn_fib_get_table(id, 1); |
| 866 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 869 | void dn_fib_flush(void) |
| 870 | { |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 871 | int flushed = 0; |
| 872 | struct dn_fib_table *tb; |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 873 | struct hlist_node *node; |
| 874 | unsigned int h; |
| 875 | |
| 876 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { |
| 877 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 878 | flushed += tb->flush(tb); |
| 879 | } |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 880 | |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 881 | if (flushed) |
| 882 | dn_rt_cache_flush(-1); |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | void __init dn_fib_table_init(void) |
| 886 | { |
| 887 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", |
| 888 | sizeof(struct dn_fib_info), |
| 889 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 890 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | void __exit dn_fib_table_cleanup(void) |
| 894 | { |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 895 | struct dn_fib_table *t; |
| 896 | struct hlist_node *node, *next; |
| 897 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 899 | write_lock(&dn_fib_tables_lock); |
| 900 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { |
| 901 | hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h], |
YOSHIFUJI Hideaki | 429eb0f | 2007-02-09 23:24:40 +0900 | [diff] [blame] | 902 | hlist) { |
Patrick McHardy | abcab26 | 2006-08-10 23:11:47 -0700 | [diff] [blame] | 903 | hlist_del(&t->hlist); |
| 904 | kfree(t); |
| 905 | } |
| 906 | } |
| 907 | write_unlock(&dn_fib_tables_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } |