fib_hash.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:20k
- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * IPv4 FIB: lookup engine and maintenance routines.
- *
- * Version: $Id: fib_hash.c,v 1.13 2001/10/31 21:55:54 davem Exp $
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #include <linux/config.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/string.h>
- #include <linux/socket.h>
- #include <linux/sockios.h>
- #include <linux/errno.h>
- #include <linux/in.h>
- #include <linux/inet.h>
- #include <linux/netdevice.h>
- #include <linux/if_arp.h>
- #include <linux/proc_fs.h>
- #include <linux/skbuff.h>
- #include <linux/netlink.h>
- #include <linux/init.h>
- #include <net/ip.h>
- #include <net/protocol.h>
- #include <net/route.h>
- #include <net/tcp.h>
- #include <net/sock.h>
- #include <net/ip_fib.h>
- #define FTprint(a...)
- /*
- printk(KERN_DEBUG a)
- */
- static kmem_cache_t * fn_hash_kmem;
- /*
- These bizarre types are just to force strict type checking.
- When I reversed order of bytes and changed to natural mask lengths,
- I forgot to make fixes in several places. Now I am lazy to return
- it back.
- */
- typedef struct {
- u32 datum;
- } fn_key_t;
- typedef struct {
- u32 datum;
- } fn_hash_idx_t;
- struct fib_node
- {
- struct fib_node *fn_next;
- struct fib_info *fn_info;
- #define FIB_INFO(f) ((f)->fn_info)
- fn_key_t fn_key;
- u8 fn_tos;
- u8 fn_type;
- u8 fn_scope;
- u8 fn_state;
- };
- #define FN_S_ZOMBIE 1
- #define FN_S_ACCESSED 2
- static int fib_hash_zombies;
- struct fn_zone
- {
- struct fn_zone *fz_next; /* Next not empty zone */
- struct fib_node **fz_hash; /* Hash table pointer */
- int fz_nent; /* Number of entries */
- int fz_divisor; /* Hash divisor */
- u32 fz_hashmask; /* (1<<fz_divisor) - 1 */
- #define FZ_HASHMASK(fz) ((fz)->fz_hashmask)
- int fz_order; /* Zone order */
- u32 fz_mask;
- #define FZ_MASK(fz) ((fz)->fz_mask)
- };
- /* NOTE. On fast computers evaluation of fz_hashmask and fz_mask
- can be cheaper than memory lookup, so that FZ_* macros are used.
- */
- struct fn_hash
- {
- struct fn_zone *fn_zones[33];
- struct fn_zone *fn_zone_list;
- };
- static __inline__ fn_hash_idx_t fn_hash(fn_key_t key, struct fn_zone *fz)
- {
- u32 h = ntohl(key.datum)>>(32 - fz->fz_order);
- h ^= (h>>20);
- h ^= (h>>10);
- h ^= (h>>5);
- h &= FZ_HASHMASK(fz);
- return *(fn_hash_idx_t*)&h;
- }
- #define fz_key_0(key) ((key).datum = 0)
- #define fz_prefix(key,fz) ((key).datum)
- static __inline__ fn_key_t fz_key(u32 dst, struct fn_zone *fz)
- {
- fn_key_t k;
- k.datum = dst & FZ_MASK(fz);
- return k;
- }
- static __inline__ struct fib_node ** fz_chain_p(fn_key_t key, struct fn_zone *fz)
- {
- return &fz->fz_hash[fn_hash(key, fz).datum];
- }
- static __inline__ struct fib_node * fz_chain(fn_key_t key, struct fn_zone *fz)
- {
- return fz->fz_hash[fn_hash(key, fz).datum];
- }
- extern __inline__ int fn_key_eq(fn_key_t a, fn_key_t b)
- {
- return a.datum == b.datum;
- }
- extern __inline__ int fn_key_leq(fn_key_t a, fn_key_t b)
- {
- return a.datum <= b.datum;
- }
- static rwlock_t fib_hash_lock = RW_LOCK_UNLOCKED;
- #define FZ_MAX_DIVISOR 1024
- #ifdef CONFIG_IP_ROUTE_LARGE_TABLES
- /* The fib hash lock must be held when this is called. */
- static __inline__ void fn_rebuild_zone(struct fn_zone *fz,
- struct fib_node **old_ht,
- int old_divisor)
- {
- int i;
- struct fib_node *f, **fp, *next;
- for (i=0; i<old_divisor; i++) {
- for (f=old_ht[i]; f; f=next) {
- next = f->fn_next;
- for (fp = fz_chain_p(f->fn_key, fz);
- *fp && fn_key_leq((*fp)->fn_key, f->fn_key);
- fp = &(*fp)->fn_next)
- /* NONE */;
- f->fn_next = *fp;
- *fp = f;
- }
- }
- }
- static void fn_rehash_zone(struct fn_zone *fz)
- {
- struct fib_node **ht, **old_ht;
- int old_divisor, new_divisor;
- u32 new_hashmask;
-
- old_divisor = fz->fz_divisor;
- switch (old_divisor) {
- case 16:
- new_divisor = 256;
- new_hashmask = 0xFF;
- break;
- case 256:
- new_divisor = 1024;
- new_hashmask = 0x3FF;
- break;
- default:
- printk(KERN_CRIT "route.c: bad divisor %d!n", old_divisor);
- return;
- }
- #if RT_CACHE_DEBUG >= 2
- printk("fn_rehash_zone: hash for zone %d grows from %dn", fz->fz_order, old_divisor);
- #endif
- ht = kmalloc(new_divisor*sizeof(struct fib_node*), GFP_KERNEL);
- if (ht) {
- memset(ht, 0, new_divisor*sizeof(struct fib_node*));
- write_lock_bh(&fib_hash_lock);
- old_ht = fz->fz_hash;
- fz->fz_hash = ht;
- fz->fz_hashmask = new_hashmask;
- fz->fz_divisor = new_divisor;
- fn_rebuild_zone(fz, old_ht, old_divisor);
- write_unlock_bh(&fib_hash_lock);
- kfree(old_ht);
- }
- }
- #endif /* CONFIG_IP_ROUTE_LARGE_TABLES */
- static void fn_free_node(struct fib_node * f)
- {
- fib_release_info(FIB_INFO(f));
- kmem_cache_free(fn_hash_kmem, f);
- }
- static struct fn_zone *
- fn_new_zone(struct fn_hash *table, int z)
- {
- int i;
- struct fn_zone *fz = kmalloc(sizeof(struct fn_zone), GFP_KERNEL);
- if (!fz)
- return NULL;
- memset(fz, 0, sizeof(struct fn_zone));
- if (z) {
- fz->fz_divisor = 16;
- fz->fz_hashmask = 0xF;
- } else {
- fz->fz_divisor = 1;
- fz->fz_hashmask = 0;
- }
- fz->fz_hash = kmalloc(fz->fz_divisor*sizeof(struct fib_node*), GFP_KERNEL);
- if (!fz->fz_hash) {
- kfree(fz);
- return NULL;
- }
- memset(fz->fz_hash, 0, fz->fz_divisor*sizeof(struct fib_node*));
- fz->fz_order = z;
- fz->fz_mask = inet_make_mask(z);
- /* Find the first not empty zone with more specific mask */
- for (i=z+1; i<=32; i++)
- if (table->fn_zones[i])
- break;
- write_lock_bh(&fib_hash_lock);
- if (i>32) {
- /* No more specific masks, we are the first. */
- fz->fz_next = table->fn_zone_list;
- table->fn_zone_list = fz;
- } else {
- fz->fz_next = table->fn_zones[i]->fz_next;
- table->fn_zones[i]->fz_next = fz;
- }
- table->fn_zones[z] = fz;
- write_unlock_bh(&fib_hash_lock);
- return fz;
- }
- static int
- fn_hash_lookup(struct fib_table *tb, const struct rt_key *key, struct fib_result *res)
- {
- int err;
- struct fn_zone *fz;
- struct fn_hash *t = (struct fn_hash*)tb->tb_data;
- read_lock(&fib_hash_lock);
- for (fz = t->fn_zone_list; fz; fz = fz->fz_next) {
- struct fib_node *f;
- fn_key_t k = fz_key(key->dst, fz);
- for (f = fz_chain(k, fz); f; f = f->fn_next) {
- if (!fn_key_eq(k, f->fn_key)) {
- if (fn_key_leq(k, f->fn_key))
- break;
- else
- continue;
- }
- #ifdef CONFIG_IP_ROUTE_TOS
- if (f->fn_tos && f->fn_tos != key->tos)
- continue;
- #endif
- f->fn_state |= FN_S_ACCESSED;
- if (f->fn_state&FN_S_ZOMBIE)
- continue;
- if (f->fn_scope < key->scope)
- continue;
- err = fib_semantic_match(f->fn_type, FIB_INFO(f), key, res);
- if (err == 0) {
- res->type = f->fn_type;
- res->scope = f->fn_scope;
- res->prefixlen = fz->fz_order;
- goto out;
- }
- if (err < 0)
- goto out;
- }
- }
- err = 1;
- out:
- read_unlock(&fib_hash_lock);
- return err;
- }
- static int fn_hash_last_dflt=-1;
- static int fib_detect_death(struct fib_info *fi, int order,
- struct fib_info **last_resort, int *last_idx)
- {
- struct neighbour *n;
- int state = NUD_NONE;
- n = neigh_lookup(&arp_tbl, &fi->fib_nh[0].nh_gw, fi->fib_dev);
- if (n) {
- state = n->nud_state;
- neigh_release(n);
- }
- if (state==NUD_REACHABLE)
- return 0;
- if ((state&NUD_VALID) && order != fn_hash_last_dflt)
- return 0;
- if ((state&NUD_VALID) ||
- (*last_idx<0 && order > fn_hash_last_dflt)) {
- *last_resort = fi;
- *last_idx = order;
- }
- return 1;
- }
- static void
- fn_hash_select_default(struct fib_table *tb, const struct rt_key *key, struct fib_result *res)
- {
- int order, last_idx;
- struct fib_node *f;
- struct fib_info *fi = NULL;
- struct fib_info *last_resort;
- struct fn_hash *t = (struct fn_hash*)tb->tb_data;
- struct fn_zone *fz = t->fn_zones[0];
- if (fz == NULL)
- return;
- last_idx = -1;
- last_resort = NULL;
- order = -1;
- read_lock(&fib_hash_lock);
- for (f = fz->fz_hash[0]; f; f = f->fn_next) {
- struct fib_info *next_fi = FIB_INFO(f);
- if ((f->fn_state&FN_S_ZOMBIE) ||
- f->fn_scope != res->scope ||
- f->fn_type != RTN_UNICAST)
- continue;
- if (next_fi->fib_priority > res->fi->fib_priority)
- break;
- if (!next_fi->fib_nh[0].nh_gw || next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
- continue;
- f->fn_state |= FN_S_ACCESSED;
- if (fi == NULL) {
- if (next_fi != res->fi)
- break;
- } else if (!fib_detect_death(fi, order, &last_resort, &last_idx)) {
- if (res->fi)
- fib_info_put(res->fi);
- res->fi = fi;
- atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
- goto out;
- }
- fi = next_fi;
- order++;
- }
- if (order<=0 || fi==NULL) {
- fn_hash_last_dflt = -1;
- goto out;
- }
- if (!fib_detect_death(fi, order, &last_resort, &last_idx)) {
- if (res->fi)
- fib_info_put(res->fi);
- res->fi = fi;
- atomic_inc(&fi->fib_clntref);
- fn_hash_last_dflt = order;
- goto out;
- }
- if (last_idx >= 0) {
- if (res->fi)
- fib_info_put(res->fi);
- res->fi = last_resort;
- if (last_resort)
- atomic_inc(&last_resort->fib_clntref);
- }
- fn_hash_last_dflt = last_idx;
- out:
- read_unlock(&fib_hash_lock);
- }
- #define FIB_SCAN(f, fp)
- for ( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
- #define FIB_SCAN_KEY(f, fp, key)
- for ( ; ((f) = *(fp)) != NULL && fn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
- #ifndef CONFIG_IP_ROUTE_TOS
- #define FIB_SCAN_TOS(f, fp, key, tos) FIB_SCAN_KEY(f, fp, key)
- #else
- #define FIB_SCAN_TOS(f, fp, key, tos)
- for ( ; ((f) = *(fp)) != NULL && fn_key_eq((f)->fn_key, (key)) &&
- (f)->fn_tos == (tos) ; (fp) = &(f)->fn_next)
- #endif
- static void rtmsg_fib(int, struct fib_node*, int, int,
- struct nlmsghdr *n,
- struct netlink_skb_parms *);
- static int
- fn_hash_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
- struct nlmsghdr *n, struct netlink_skb_parms *req)
- {
- struct fn_hash *table = (struct fn_hash*)tb->tb_data;
- struct fib_node *new_f, *f, **fp, **del_fp;
- struct fn_zone *fz;
- struct fib_info *fi;
- int z = r->rtm_dst_len;
- int type = r->rtm_type;
- #ifdef CONFIG_IP_ROUTE_TOS
- u8 tos = r->rtm_tos;
- #endif
- fn_key_t key;
- int err;
- FTprint("tb(%d)_insert: %d %08x/%d %d %08xn", tb->tb_id, r->rtm_type, rta->rta_dst ?
- *(u32*)rta->rta_dst : 0, z, rta->rta_oif ? *rta->rta_oif : -1,
- rta->rta_prefsrc ? *(u32*)rta->rta_prefsrc : 0);
- if (z > 32)
- return -EINVAL;
- fz = table->fn_zones[z];
- if (!fz && !(fz = fn_new_zone(table, z)))
- return -ENOBUFS;
- fz_key_0(key);
- if (rta->rta_dst) {
- u32 dst;
- memcpy(&dst, rta->rta_dst, 4);
- if (dst & ~FZ_MASK(fz))
- return -EINVAL;
- key = fz_key(dst, fz);
- }
- if ((fi = fib_create_info(r, rta, n, &err)) == NULL)
- return err;
- #ifdef CONFIG_IP_ROUTE_LARGE_TABLES
- if (fz->fz_nent > (fz->fz_divisor<<2) &&
- fz->fz_divisor < FZ_MAX_DIVISOR &&
- (z==32 || (1<<z) > fz->fz_divisor))
- fn_rehash_zone(fz);
- #endif
- fp = fz_chain_p(key, fz);
- /*
- * Scan list to find the first route with the same destination
- */
- FIB_SCAN(f, fp) {
- if (fn_key_leq(key,f->fn_key))
- break;
- }
- #ifdef CONFIG_IP_ROUTE_TOS
- /*
- * Find route with the same destination and tos.
- */
- FIB_SCAN_KEY(f, fp, key) {
- if (f->fn_tos <= tos)
- break;
- }
- #endif
- del_fp = NULL;
- if (f && (f->fn_state&FN_S_ZOMBIE) &&
- #ifdef CONFIG_IP_ROUTE_TOS
- f->fn_tos == tos &&
- #endif
- fn_key_eq(f->fn_key, key)) {
- del_fp = fp;
- fp = &f->fn_next;
- f = *fp;
- goto create;
- }
- FIB_SCAN_TOS(f, fp, key, tos) {
- if (fi->fib_priority <= FIB_INFO(f)->fib_priority)
- break;
- }
- /* Now f==*fp points to the first node with the same
- keys [prefix,tos,priority], if such key already
- exists or to the node, before which we will insert new one.
- */
- if (f &&
- #ifdef CONFIG_IP_ROUTE_TOS
- f->fn_tos == tos &&
- #endif
- fn_key_eq(f->fn_key, key) &&
- fi->fib_priority == FIB_INFO(f)->fib_priority) {
- struct fib_node **ins_fp;
- err = -EEXIST;
- if (n->nlmsg_flags&NLM_F_EXCL)
- goto out;
- if (n->nlmsg_flags&NLM_F_REPLACE) {
- del_fp = fp;
- fp = &f->fn_next;
- f = *fp;
- goto replace;
- }
- ins_fp = fp;
- err = -EEXIST;
- FIB_SCAN_TOS(f, fp, key, tos) {
- if (fi->fib_priority != FIB_INFO(f)->fib_priority)
- break;
- if (f->fn_type == type && f->fn_scope == r->rtm_scope
- && FIB_INFO(f) == fi)
- goto out;
- }
- if (!(n->nlmsg_flags&NLM_F_APPEND)) {
- fp = ins_fp;
- f = *fp;
- }
- }
- create:
- err = -ENOENT;
- if (!(n->nlmsg_flags&NLM_F_CREATE))
- goto out;
- replace:
- err = -ENOBUFS;
- new_f = kmem_cache_alloc(fn_hash_kmem, SLAB_KERNEL);
- if (new_f == NULL)
- goto out;
- memset(new_f, 0, sizeof(struct fib_node));
- new_f->fn_key = key;
- #ifdef CONFIG_IP_ROUTE_TOS
- new_f->fn_tos = tos;
- #endif
- new_f->fn_type = type;
- new_f->fn_scope = r->rtm_scope;
- FIB_INFO(new_f) = fi;
- /*
- * Insert new entry to the list.
- */
- new_f->fn_next = f;
- write_lock_bh(&fib_hash_lock);
- *fp = new_f;
- write_unlock_bh(&fib_hash_lock);
- fz->fz_nent++;
- if (del_fp) {
- f = *del_fp;
- /* Unlink replaced node */
- write_lock_bh(&fib_hash_lock);
- *del_fp = f->fn_next;
- write_unlock_bh(&fib_hash_lock);
- if (!(f->fn_state&FN_S_ZOMBIE))
- rtmsg_fib(RTM_DELROUTE, f, z, tb->tb_id, n, req);
- if (f->fn_state&FN_S_ACCESSED)
- rt_cache_flush(-1);
- fn_free_node(f);
- fz->fz_nent--;
- } else {
- rt_cache_flush(-1);
- }
- rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->tb_id, n, req);
- return 0;
- out:
- fib_release_info(fi);
- return err;
- }
- static int
- fn_hash_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
- struct nlmsghdr *n, struct netlink_skb_parms *req)
- {
- struct fn_hash *table = (struct fn_hash*)tb->tb_data;
- struct fib_node **fp, **del_fp, *f;
- int z = r->rtm_dst_len;
- struct fn_zone *fz;
- fn_key_t key;
- int matched;
- #ifdef CONFIG_IP_ROUTE_TOS
- u8 tos = r->rtm_tos;
- #endif
- FTprint("tb(%d)_delete: %d %08x/%d %dn", tb->tb_id, r->rtm_type, rta->rta_dst ?
- *(u32*)rta->rta_dst : 0, z, rta->rta_oif ? *rta->rta_oif : -1);
- if (z > 32)
- return -EINVAL;
- if ((fz = table->fn_zones[z]) == NULL)
- return -ESRCH;
- fz_key_0(key);
- if (rta->rta_dst) {
- u32 dst;
- memcpy(&dst, rta->rta_dst, 4);
- if (dst & ~FZ_MASK(fz))
- return -EINVAL;
- key = fz_key(dst, fz);
- }
- fp = fz_chain_p(key, fz);
- FIB_SCAN(f, fp) {
- if (fn_key_eq(f->fn_key, key))
- break;
- if (fn_key_leq(key, f->fn_key)) {
- return -ESRCH;
- }
- }
- #ifdef CONFIG_IP_ROUTE_TOS
- FIB_SCAN_KEY(f, fp, key) {
- if (f->fn_tos == tos)
- break;
- }
- #endif
- matched = 0;
- del_fp = NULL;
- FIB_SCAN_TOS(f, fp, key, tos) {
- struct fib_info * fi = FIB_INFO(f);
- if (f->fn_state&FN_S_ZOMBIE) {
- return -ESRCH;
- }
- matched++;
- if (del_fp == NULL &&
- (!r->rtm_type || f->fn_type == r->rtm_type) &&
- (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
- (!r->rtm_protocol || fi->fib_protocol == r->rtm_protocol) &&
- fib_nh_match(r, n, rta, fi) == 0)
- del_fp = fp;
- }
- if (del_fp) {
- f = *del_fp;
- rtmsg_fib(RTM_DELROUTE, f, z, tb->tb_id, n, req);
- if (matched != 1) {
- write_lock_bh(&fib_hash_lock);
- *del_fp = f->fn_next;
- write_unlock_bh(&fib_hash_lock);
- if (f->fn_state&FN_S_ACCESSED)
- rt_cache_flush(-1);
- fn_free_node(f);
- fz->fz_nent--;
- } else {
- f->fn_state |= FN_S_ZOMBIE;
- if (f->fn_state&FN_S_ACCESSED) {
- f->fn_state &= ~FN_S_ACCESSED;
- rt_cache_flush(-1);
- }
- if (++fib_hash_zombies > 128)
- fib_flush();
- }
- return 0;
- }
- return -ESRCH;
- }
- extern __inline__ int
- fn_flush_list(struct fib_node ** fp, int z, struct fn_hash *table)
- {
- int found = 0;
- struct fib_node *f;
- while ((f = *fp) != NULL) {
- struct fib_info *fi = FIB_INFO(f);
- if (fi && ((f->fn_state&FN_S_ZOMBIE) || (fi->fib_flags&RTNH_F_DEAD))) {
- write_lock_bh(&fib_hash_lock);
- *fp = f->fn_next;
- write_unlock_bh(&fib_hash_lock);
- fn_free_node(f);
- found++;
- continue;
- }
- fp = &f->fn_next;
- }
- return found;
- }
- static int fn_hash_flush(struct fib_table *tb)
- {
- struct fn_hash *table = (struct fn_hash*)tb->tb_data;
- struct fn_zone *fz;
- int found = 0;
- fib_hash_zombies = 0;
- for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
- int i;
- int tmp = 0;
- for (i=fz->fz_divisor-1; i>=0; i--)
- tmp += fn_flush_list(&fz->fz_hash[i], fz->fz_order, table);
- fz->fz_nent -= tmp;
- found += tmp;
- }
- return found;
- }
- #ifdef CONFIG_PROC_FS
- static int fn_hash_get_info(struct fib_table *tb, char *buffer, int first, int count)
- {
- struct fn_hash *table = (struct fn_hash*)tb->tb_data;
- struct fn_zone *fz;
- int pos = 0;
- int n = 0;
- read_lock(&fib_hash_lock);
- for (fz=table->fn_zone_list; fz; fz = fz->fz_next) {
- int i;
- struct fib_node *f;
- int maxslot = fz->fz_divisor;
- struct fib_node **fp = fz->fz_hash;
- if (fz->fz_nent == 0)
- continue;
- if (pos + fz->fz_nent <= first) {
- pos += fz->fz_nent;
- continue;
- }
- for (i=0; i < maxslot; i++, fp++) {
- for (f = *fp; f; f = f->fn_next) {
- if (++pos <= first)
- continue;
- fib_node_get_info(f->fn_type,
- f->fn_state&FN_S_ZOMBIE,
- FIB_INFO(f),
- fz_prefix(f->fn_key, fz),
- FZ_MASK(fz), buffer);
- buffer += 128;
- if (++n >= count)
- goto out;
- }
- }
- }
- out:
- read_unlock(&fib_hash_lock);
- return n;
- }
- #endif
- static __inline__ int
- fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
- struct fib_table *tb,
- struct fn_zone *fz,
- struct fib_node *f)
- {
- int i, s_i;
- s_i = cb->args[3];
- for (i=0; f; i++, f=f->fn_next) {
- if (i < s_i) continue;
- if (f->fn_state&FN_S_ZOMBIE) continue;
- if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
- RTM_NEWROUTE,
- tb->tb_id, (f->fn_state&FN_S_ZOMBIE) ? 0 : f->fn_type, f->fn_scope,
- &f->fn_key, fz->fz_order, f->fn_tos,
- f->fn_info) < 0) {
- cb->args[3] = i;
- return -1;
- }
- }
- cb->args[3] = i;
- return skb->len;
- }
- static __inline__ int
- fn_hash_dump_zone(struct sk_buff *skb, struct netlink_callback *cb,
- struct fib_table *tb,
- struct fn_zone *fz)
- {
- int h, s_h;
- s_h = cb->args[2];
- for (h=0; h < fz->fz_divisor; h++) {
- if (h < s_h) continue;
- if (h > s_h)
- memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
- if (fz->fz_hash == NULL || fz->fz_hash[h] == NULL)
- continue;
- if (fn_hash_dump_bucket(skb, cb, tb, fz, fz->fz_hash[h]) < 0) {
- cb->args[2] = h;
- return -1;
- }
- }
- cb->args[2] = h;
- return skb->len;
- }
- static int fn_hash_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb)
- {
- int m, s_m;
- struct fn_zone *fz;
- struct fn_hash *table = (struct fn_hash*)tb->tb_data;
- s_m = cb->args[1];
- read_lock(&fib_hash_lock);
- for (fz = table->fn_zone_list, m=0; fz; fz = fz->fz_next, m++) {
- if (m < s_m) continue;
- if (m > s_m)
- memset(&cb->args[2], 0, sizeof(cb->args) - 2*sizeof(cb->args[0]));
- if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) {
- cb->args[1] = m;
- read_unlock(&fib_hash_lock);
- return -1;
- }
- }
- read_unlock(&fib_hash_lock);
- cb->args[1] = m;
- return skb->len;
- }
- static void rtmsg_fib(int event, struct fib_node* f, int z, int tb_id,
- struct nlmsghdr *n, struct netlink_skb_parms *req)
- {
- struct sk_buff *skb;
- u32 pid = req ? req->pid : 0;
- int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
- skb = alloc_skb(size, GFP_KERNEL);
- if (!skb)
- return;
- if (fib_dump_info(skb, pid, n->nlmsg_seq, event, tb_id,
- f->fn_type, f->fn_scope, &f->fn_key, z, f->fn_tos,
- FIB_INFO(f)) < 0) {
- kfree_skb(skb);
- return;
- }
- NETLINK_CB(skb).dst_groups = RTMGRP_IPV4_ROUTE;
- if (n->nlmsg_flags&NLM_F_ECHO)
- atomic_inc(&skb->users);
- netlink_broadcast(rtnl, skb, pid, RTMGRP_IPV4_ROUTE, GFP_KERNEL);
- if (n->nlmsg_flags&NLM_F_ECHO)
- netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
- }
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- struct fib_table * fib_hash_init(int id)
- #else
- struct fib_table * __init fib_hash_init(int id)
- #endif
- {
- struct fib_table *tb;
- if (fn_hash_kmem == NULL)
- fn_hash_kmem = kmem_cache_create("ip_fib_hash",
- sizeof(struct fib_node),
- 0, SLAB_HWCACHE_ALIGN,
- NULL, NULL);
- tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash), GFP_KERNEL);
- if (tb == NULL)
- return NULL;
- tb->tb_id = id;
- tb->tb_lookup = fn_hash_lookup;
- tb->tb_insert = fn_hash_insert;
- tb->tb_delete = fn_hash_delete;
- tb->tb_flush = fn_hash_flush;
- tb->tb_select_default = fn_hash_select_default;
- tb->tb_dump = fn_hash_dump;
- #ifdef CONFIG_PROC_FS
- tb->tb_get_info = fn_hash_get_info;
- #endif
- memset(tb->tb_data, 0, sizeof(struct fn_hash));
- return tb;
- }