/* * 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 <asm/uaccess.h> #include <asm/system.h> #include <linux/bitops.h> #include <linux/types.h> #include <linux/kernel.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/inetdevice.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/net_namespace.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> #include "fib_lookup.h" static struct kmem_cache *fn_hash_kmem __read_mostly; static struct kmem_cache *fn_alias_kmem __read_mostly; struct fib_node { struct hlist_node fn_hash; struct list_head fn_alias; __be32 fn_key; }; struct fn_zone { struct fn_zone *fz_next; /* Next not empty zone */ struct hlist_head *fz_hash; /* Hash table pointer */ int fz_nent; /* Number of entries */ int fz_divisor; /* Hash divisor */ u32 fz_hashmask; /* (fz_divisor - 1) */ #define FZ_HASHMASK(fz) ((fz)->fz_hashmask) int fz_order; /* Zone order */ __be32 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 u32 fn_hash(__be32 key, struct fn_zone *fz) { u32 h = ntohl(key)>>(32 - fz->fz_order); h ^= (h>>20); h ^= (h>>10); h ^= (h>>5); h &= FZ_HASHMASK(fz); return h; } static inline __be32 fz_key(__be32 dst, struct fn_zone *fz) { return dst & FZ_MASK(fz); } static DEFINE_RWLOCK(fib_hash_lock); static unsigned int fib_hash_genid; #define FZ_MAX_DIVISOR ((PAGE_SIZE<<MAX_ORDER) / sizeof(struct hlist_head)) static struct hlist_head *fz_hash_alloc(int divisor) { unsigned long size = divisor * sizeof(struct hlist_head); if (size <= PAGE_SIZE) { return kmalloc(size, GFP_KERNEL); } else { return (struct hlist_head *) __get_free_pages(GFP_KERNEL, get_order(size)); } } /* The fib hash lock must be held when this is called. */ static inline void fn_rebuild_zone(struct fn_zone *fz, struct hlist_head *old_ht, int old_divisor) { int i; for (i = 0; i < old_divisor; i++) { struct hlist_node *node, *n; struct fib_node *f; hlist_for_each_entry_safe(f, node, n, &old_ht[i], fn_hash) { struct hlist_head *new_head; hlist_del(&f->fn_hash); new_head = &fz->fz_hash[fn_hash(f->fn_key, fz)]; hlist_add_head(&f->fn_hash, new_head); } } } static void fz_hash_free(struct hlist_head *hash, int divisor) { unsigned long size = divisor * sizeof(struct hlist_head); if (size <= PAGE_SIZE) kfree(hash); else free_pages((unsigned long)hash, get_order(size)); } static void fn_rehash_zone(struct fn_zone *fz) { struct hlist_head *ht, *old_ht; int old_divisor, new_divisor; u32 new_hashmask; old_divisor = fz->fz_divisor; switch (old_divisor) { case 16: new_divisor = 256; break; case 256: new_divisor = 1024; break; default: if ((old_divisor << 1) > FZ_MAX_DIVISOR) { printk(KERN_CRIT "route.c: bad divisor %d!\n", old_divisor); return; } new_divisor = (old_divisor << 1); break; } new_hashmask = (new_divisor - 1); #if RT_CACHE_DEBUG >= 2 printk("fn_rehash_zone: hash for zone %d grows from %d\n", fz->fz_order, old_divisor); #endif ht = fz_hash_alloc(new_divisor); if (ht) { memset(ht, 0, new_divisor * sizeof(struct hlist_head)); 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); fib_hash_genid++; write_unlock_bh(&fib_hash_lock); fz_hash_free(old_ht, old_divisor); } } static inline void fn_free_node(struct fib_node * f) { kmem_cache_free(fn_hash_kmem, f); } static inline void fn_free_alias(struct fib_alias *fa) { fib_release_info(fa->fa_info); kmem_cache_free(fn_alias_kmem, fa); } static struct fn_zone * fn_new_zone(struct fn_hash *table, int z) { int i; struct fn_zone *fz = kzalloc(sizeof(struct fn_zone), GFP_KERNEL); if (!fz) return NULL; if (z) { fz->fz_divisor = 16; } else { fz->fz_divisor = 1; } fz->fz_hashmask = (fz->fz_divisor - 1); fz->fz_hash = fz_hash_alloc(fz->fz_divisor); if (!fz->fz_hash) { kfree(fz); return NULL; } memset(fz->fz_hash, 0, fz->fz_divisor * sizeof(struct hlist_head *)); 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; fib_hash_genid++; write_unlock_bh(&fib_hash_lock); return fz; } static int fn_hash_lookup(struct fib_table *tb, const struct flowi *flp, 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 hlist_head *head; struct hlist_node *node; struct fib_node *f; __be32 k = fz_key(flp->fl4_dst, fz); head = &fz->fz_hash[fn_hash(k, fz)]; hlist_for_each_entry(f, node, head, fn_hash) { if (f->fn_key != k) continue; err = fib_semantic_match(&f->fn_alias, flp, res, f->fn_key, fz->fz_mask, fz->fz_order); if (err <= 0) goto out; } } err = 1; out: read_unlock(&fib_hash_lock); return err; } static int fn_hash_last_dflt=-1; static void fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) { int order, last_idx; struct hlist_node *node; 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); hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) { struct fib_alias *fa; list_for_each_entry(fa, &f->fn_alias, fa_list) { struct fib_info *next_fi = fa->fa_info; if (fa->fa_scope != res->scope || fa->fa_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; fa->fa_state |= FA_S_ACCESSED; if (fi == NULL) { if (next_fi != res->fi) break; } else if (!fib_detect_death(fi, order, &last_resort, &last_idx, &fn_hash_last_dflt)) { 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, &fn_hash_last_dflt)) { 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); } /* Insert node F to FZ. */ static inline void fib_insert_node(struct fn_zone *fz, struct fib_node *f) { struct hlist_head *head = &fz->fz_hash[fn_hash(f->fn_key, fz)]; hlist_add_head(&f->fn_hash, head); } /* Return the node in FZ matching KEY. */ static struct fib_node *fib_find_node(struct fn_zone *fz, __be32 key) { struct hlist_head *head = &fz->fz_hash[fn_hash(key, fz)]; struct hlist_node *node; struct fib_node *f; hlist_for_each_entry(f, node, head, fn_hash) { if (f->fn_key == key) return f; } return NULL; } static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg) { struct fn_hash *table = (struct fn_hash *) tb->tb_data; struct fib_node *new_f, *f; struct fib_alias *fa, *new_fa; struct fn_zone *fz; struct fib_info *fi; u8 tos = cfg->fc_tos; __be32 key; int err; if (cfg->fc_dst_len > 32) return -EINVAL; fz = table->fn_zones[cfg->fc_dst_len]; if (!fz && !(fz = fn_new_zone(table, cfg->fc_dst_len))) return -ENOBUFS; key = 0; if (cfg->fc_dst) { if (cfg->fc_dst & ~FZ_MASK(fz)) return -EINVAL; key = fz_key(cfg->fc_dst, fz); } fi = fib_create_info(cfg); if (IS_ERR(fi)) return PTR_ERR(fi); if (fz->fz_nent > (fz->fz_divisor<<1) && fz->fz_divisor < FZ_MAX_DIVISOR && (cfg->fc_dst_len == 32 || (1 << cfg->fc_dst_len) > fz->fz_divisor)) fn_rehash_zone(fz); f = fib_find_node(fz, key); if (!f) fa = NULL; else fa = fib_find_alias(&f->fn_alias, tos, fi->fib_priority); /* Now fa, if non-NULL, points to the first fib alias * with the same keys [prefix,tos,priority], if such key already * exists or to the node before which we will insert new one. * * If fa is NULL, we will need to allocate a new one and * insert to the head of f. * * If f is NULL, no fib node matched the destination key * and we need to allocate a new one of those as well. */ if (fa && fa->fa_tos == tos && fa->fa_info->fib_priority == fi->fib_priority) { struct fib_alias *fa_orig; err = -EEXIST; if (cfg->fc_nlflags & NLM_F_EXCL) goto out; if (cfg->fc_nlflags & NLM_F_REPLACE) { struct fib_info *fi_drop; u8 state; write_lock_bh(&fib_hash_lock); fi_drop = fa->fa_info; fa->fa_info = fi; fa->fa_type = cfg->fc_type; fa->fa_scope = cfg->fc_scope; state = fa->fa_state; fa->fa_state &= ~FA_S_ACCESSED; fib_hash_genid++; write_unlock_bh(&fib_hash_lock); fib_release_info(fi_drop); if (state & FA_S_ACCESSED) rt_cache_flush(-1); rtmsg_fib(RTM_NEWROUTE, key, fa, cfg->fc_dst_len, tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); return 0; } /* Error if we find a perfect match which * uses the same scope, type, and nexthop * information. */ fa_orig = fa; fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); list_for_each_entry_continue(fa, &f->fn_alias, fa_list) { if (fa->fa_tos != tos) break; if (fa->fa_info->fib_priority != fi->fib_priority) break; if (fa->fa_type == cfg->fc_type && fa->fa_scope == cfg->fc_scope && fa->fa_info == fi) goto out; } if (!(cfg->fc_nlflags & NLM_F_APPEND)) fa = fa_orig; } err = -ENOENT; if (!(cfg->fc_nlflags & NLM_F_CREATE)) goto out; err = -ENOBUFS; new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); if (new_fa == NULL) goto out; new_f = NULL; if (!f) { new_f = kmem_cache_alloc(fn_hash_kmem, GFP_KERNEL); if (new_f == NULL) goto out_free_new_fa; INIT_HLIST_NODE(&new_f->fn_hash); INIT_LIST_HEAD(&new_f->fn_alias); new_f->fn_key = key; f = new_f; } new_fa->fa_info = fi; new_fa->fa_tos = tos; new_fa->fa_type = cfg->fc_type; new_fa->fa_scope = cfg->fc_scope; new_fa->fa_state = 0; /* * Insert new entry to the list. */ write_lock_bh(&fib_hash_lock); if (new_f) fib_insert_node(fz, new_f); list_add_tail(&new_fa->fa_list, (fa ? &fa->fa_list : &f->fn_alias)); fib_hash_genid++; write_unlock_bh(&fib_hash_lock); if (new_f) fz->fz_nent++; rt_cache_flush(-1); rtmsg_fib(RTM_NEWROUTE, key, new_fa, cfg->fc_dst_len, tb->tb_id, &cfg->fc_nlinfo, 0); return 0; out_free_new_fa: kmem_cache_free(fn_alias_kmem, new_fa); out: fib_release_info(fi); return err; } static int fn_hash_delete(struct fib_table *tb, struct fib_config *cfg) { struct fn_hash *table = (struct fn_hash*)tb->tb_data; struct fib_node *f; struct fib_alias *fa, *fa_to_delete; struct fn_zone *fz; __be32 key; if (cfg->fc_dst_len > 32) return -EINVAL; if ((fz = table->fn_zones[cfg->fc_dst_len]) == NULL) return -ESRCH; key = 0; if (cfg->fc_dst) { if (cfg->fc_dst & ~FZ_MASK(fz)) return -EINVAL; key = fz_key(cfg->fc_dst, fz); } f = fib_find_node(fz, key); if (!f) fa = NULL; else fa = fib_find_alias(&f->fn_alias, cfg->fc_tos, 0); if (!fa) return -ESRCH; fa_to_delete = NULL; fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); list_for_each_entry_continue(fa, &f->fn_alias, fa_list) { struct fib_info *fi = fa->fa_info; if (fa->fa_tos != cfg->fc_tos) break; if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && (cfg->fc_scope == RT_SCOPE_NOWHERE || fa->fa_scope == cfg->fc_scope) && (!cfg->fc_protocol || fi->fib_protocol == cfg->fc_protocol) && fib_nh_match(cfg, fi) == 0) { fa_to_delete = fa; break; } } if (fa_to_delete) { int kill_fn; fa = fa_to_delete; rtmsg_fib(RTM_DELROUTE, key, fa, cfg->fc_dst_len, tb->tb_id, &cfg->fc_nlinfo, 0); kill_fn = 0; write_lock_bh(&fib_hash_lock); list_del(&fa->fa_list); if (list_empty(&f->fn_alias)) { hlist_del(&f->fn_hash); kill_fn = 1; } fib_hash_genid++; write_unlock_bh(&fib_hash_lock); if (fa->fa_state & FA_S_ACCESSED) rt_cache_flush(-1); fn_free_alias(fa); if (kill_fn) { fn_free_node(f); fz->fz_nent--; } return 0; } return -ESRCH; } static int fn_flush_list(struct fn_zone *fz, int idx) { struct hlist_head *head = &fz->fz_hash[idx]; struct hlist_node *node, *n; struct fib_node *f; int found = 0; hlist_for_each_entry_safe(f, node, n, head, fn_hash) { struct fib_alias *fa, *fa_node; int kill_f; kill_f = 0; list_for_each_entry_safe(fa, fa_node, &f->fn_alias, fa_list) { struct fib_info *fi = fa->fa_info; if (fi && (fi->fib_flags&RTNH_F_DEAD)) { write_lock_bh(&fib_hash_lock); list_del(&fa->fa_list); if (list_empty(&f->fn_alias)) { hlist_del(&f->fn_hash); kill_f = 1; } fib_hash_genid++; write_unlock_bh(&fib_hash_lock); fn_free_alias(fa); found++; } } if (kill_f) { fn_free_node(f); fz->fz_nent--; } } 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; for (fz = table->fn_zone_list; fz; fz = fz->fz_next) { int i; for (i = fz->fz_divisor - 1; i >= 0; i--) found += fn_flush_list(fz, i); } return found; } static inline int fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb, struct fib_table *tb, struct fn_zone *fz, struct hlist_head *head) { struct hlist_node *node; struct fib_node *f; int i, s_i; s_i = cb->args[4]; i = 0; hlist_for_each_entry(f, node, head, fn_hash) { struct fib_alias *fa; list_for_each_entry(fa, &f->fn_alias, fa_list) { if (i < s_i) goto next; if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_NEWROUTE, tb->tb_id, fa->fa_type, fa->fa_scope, f->fn_key, fz->fz_order, fa->fa_tos, fa->fa_info, NLM_F_MULTI) < 0) { cb->args[4] = i; return -1; } next: i++; } } cb->args[4] = 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[3]; for (h=0; h < fz->fz_divisor; h++) { if (h < s_h) continue; if (h > s_h) memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); if (fz->fz_hash == NULL || hlist_empty(&fz->fz_hash[h])) continue; if (fn_hash_dump_bucket(skb, cb, tb, fz, &fz->fz_hash[h])<0) { cb->args[3] = h; return -1; } } cb->args[3] = 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[2]; 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[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) { cb->args[2] = m; read_unlock(&fib_hash_lock); return -1; } } read_unlock(&fib_hash_lock); cb->args[2] = m; return skb->len; } #ifdef CONFIG_IP_MULTIPLE_TABLES struct fib_table * fib_hash_init(u32 id) #else struct fib_table * __init fib_hash_init(u32 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); if (fn_alias_kmem == NULL) fn_alias_kmem = kmem_cache_create("ip_fib_alias", sizeof(struct fib_alias), 0, SLAB_HWCACHE_ALIGN, 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; memset(tb->tb_data, 0, sizeof(struct fn_hash)); return tb; } /* ------------------------------------------------------------------------ */ #ifdef CONFIG_PROC_FS struct fib_iter_state { struct fn_zone *zone; int bucket; struct hlist_head *hash_head; struct fib_node *fn; struct fib_alias *fa; loff_t pos; unsigned int genid; int valid; }; static struct fib_alias *fib_get_first(struct seq_file *seq) { struct fib_iter_state *iter = seq->private; struct fn_hash *table = (struct fn_hash *) ip_fib_main_table->tb_data; iter->bucket = 0; iter->hash_head = NULL; iter->fn = NULL; iter->fa = NULL; iter->pos = 0; iter->genid = fib_hash_genid; iter->valid = 1; for (iter->zone = table->fn_zone_list; iter->zone; iter->zone = iter->zone->fz_next) { int maxslot; if (!iter->zone->fz_nent) continue; iter->hash_head = iter->zone->fz_hash; maxslot = iter->zone->fz_divisor; for (iter->bucket = 0; iter->bucket < maxslot; ++iter->bucket, ++iter->hash_head) { struct hlist_node *node; struct fib_node *fn; hlist_for_each_entry(fn,node,iter->hash_head,fn_hash) { struct fib_alias *fa; list_for_each_entry(fa,&fn->fn_alias,fa_list) { iter->fn = fn; iter->fa = fa; goto out; } } } } out: return iter->fa; } static struct fib_alias *fib_get_next(struct seq_file *seq) { struct fib_iter_state *iter = seq->private; struct fib_node *fn; struct fib_alias *fa; /* Advance FA, if any. */ fn = iter->fn; fa = iter->fa; if (fa) { BUG_ON(!fn); list_for_each_entry_continue(fa, &fn->fn_alias, fa_list) { iter->fa = fa; goto out; } } fa = iter->fa = NULL; /* Advance FN. */ if (fn) { struct hlist_node *node = &fn->fn_hash; hlist_for_each_entry_continue(fn, node, fn_hash) { iter->fn = fn; list_for_each_entry(fa, &fn->fn_alias, fa_list) { iter->fa = fa; goto out; } } } fn = iter->fn = NULL; /* Advance hash chain. */ if (!iter->zone) goto out; for (;;) { struct hlist_node *node; int maxslot; maxslot = iter->zone->fz_divisor; while (++iter->bucket < maxslot) { iter->hash_head++; hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) { list_for_each_entry(fa, &fn->fn_alias, fa_list) { iter->fn = fn; iter->fa = fa; goto out; } } } iter->zone = iter->zone->fz_next; if (!iter->zone) goto out; iter->bucket = 0; iter->hash_head = iter->zone->fz_hash; hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) { list_for_each_entry(fa, &fn->fn_alias, fa_list) { iter->fn = fn; iter->fa = fa; goto out; } } } out: iter->pos++; return fa; } static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos) { struct fib_iter_state *iter = seq->private; struct fib_alias *fa; if (iter->valid && pos >= iter->pos && iter->genid == fib_hash_genid) { fa = iter->fa; pos -= iter->pos; } else fa = fib_get_first(seq); if (fa) while (pos && (fa = fib_get_next(seq))) --pos; return pos ? NULL : fa; } static void *fib_seq_start(struct seq_file *seq, loff_t *pos) { void *v = NULL; read_lock(&fib_hash_lock); if (ip_fib_main_table) v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; return v; } static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos) { ++*pos; return v == SEQ_START_TOKEN ? fib_get_first(seq) : fib_get_next(seq); } static void fib_seq_stop(struct seq_file *seq, void *v) { read_unlock(&fib_hash_lock); } static unsigned fib_flag_trans(int type, __be32 mask, struct fib_info *fi) { static const unsigned type2flags[RTN_MAX + 1] = { [7] = RTF_REJECT, [8] = RTF_REJECT, }; unsigned flags = type2flags[type]; if (fi && fi->fib_nh->nh_gw) flags |= RTF_GATEWAY; if (mask == htonl(0xFFFFFFFF)) flags |= RTF_HOST; flags |= RTF_UP; return flags; } /* * This outputs /proc/net/route. * * It always works in backward compatibility mode. * The format of the file is not supposed to be changed. */ static int fib_seq_show(struct seq_file *seq, void *v) { struct fib_iter_state *iter; char bf[128]; __be32 prefix, mask; unsigned flags; struct fib_node *f; struct fib_alias *fa; struct fib_info *fi; if (v == SEQ_START_TOKEN) { seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" "\tWindow\tIRTT"); goto out; } iter = seq->private; f = iter->fn; fa = iter->fa; fi = fa->fa_info; prefix = f->fn_key; mask = FZ_MASK(iter->zone); flags = fib_flag_trans(fa->fa_type, mask, fi); if (fi) snprintf(bf, sizeof(bf), "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", fi->fib_dev ? fi->fib_dev->name : "*", prefix, fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority, mask, (fi->fib_advmss ? fi->fib_advmss + 40 : 0), fi->fib_window, fi->fib_rtt >> 3); else snprintf(bf, sizeof(bf), "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0); seq_printf(seq, "%-127s\n", bf); out: return 0; } static const struct seq_operations fib_seq_ops = { .start = fib_seq_start, .next = fib_seq_next, .stop = fib_seq_stop, .show = fib_seq_show, }; static int fib_seq_open(struct inode *inode, struct file *file) { return seq_open_private(file, &fib_seq_ops, sizeof(struct fib_iter_state)); } static const struct file_operations fib_seq_fops = { .owner = THIS_MODULE, .open = fib_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; int __init fib_proc_init(void) { if (!proc_net_fops_create(&init_net, "route", S_IRUGO, &fib_seq_fops)) return -ENOMEM; return 0; } void __init fib_proc_exit(void) { proc_net_remove(&init_net, "route"); } #endif /* CONFIG_PROC_FS */