aboutsummaryrefslogtreecommitdiff
path: root/net/ipv6/ip6_fib.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/ip6_fib.c')
-rw-r--r--net/ipv6/ip6_fib.c347
1 files changed, 277 insertions, 70 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 5bec666aba6..cb4459bd1d2 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -9,14 +9,12 @@
* 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.
- */
-
-/*
- * Changes:
- * Yuji SEKIYA @USAGI: Support default route on router node;
- * remove ip6_null_entry from the top of
- * routing table.
- * Ville Nuorvala: Fixed routing subtrees.
+ *
+ * Changes:
+ * Yuji SEKIYA @USAGI: Support default route on router node;
+ * remove ip6_null_entry from the top of
+ * routing table.
+ * Ville Nuorvala: Fixed routing subtrees.
*/
#define pr_fmt(fmt) "IPv6: " fmt
@@ -46,10 +44,9 @@
#define RT6_TRACE(x...) do { ; } while (0)
#endif
-static struct kmem_cache * fib6_node_kmem __read_mostly;
+static struct kmem_cache *fib6_node_kmem __read_mostly;
-enum fib_walk_state_t
-{
+enum fib_walk_state_t {
#ifdef CONFIG_IPV6_SUBTREES
FWS_S,
#endif
@@ -59,8 +56,7 @@ enum fib_walk_state_t
FWS_U
};
-struct fib6_cleaner_t
-{
+struct fib6_cleaner_t {
struct fib6_walker_t w;
struct net *net;
int (*func)(struct rt6_info *, void *arg);
@@ -75,8 +71,7 @@ static DEFINE_RWLOCK(fib6_walker_lock);
#define FWS_INIT FWS_L
#endif
-static void fib6_prune_clones(struct net *net, struct fib6_node *fn,
- struct rt6_info *rt);
+static void fib6_prune_clones(struct net *net, struct fib6_node *fn);
static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn);
static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn);
static int fib6_walk(struct fib6_walker_t *w);
@@ -138,7 +133,7 @@ static __inline__ __be32 addr_bit_set(const void *token, int fn_bit)
const __be32 *addr = token;
/*
* Here,
- * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)
+ * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)
* is optimized version of
* htonl(1 << ((~fn_bit)&0x1F))
* See include/asm-generic/bitops/le.h.
@@ -147,7 +142,7 @@ static __inline__ __be32 addr_bit_set(const void *token, int fn_bit)
addr[fn_bit >> 5];
}
-static __inline__ struct fib6_node * node_alloc(void)
+static __inline__ struct fib6_node *node_alloc(void)
{
struct fib6_node *fn;
@@ -156,7 +151,7 @@ static __inline__ struct fib6_node * node_alloc(void)
return fn;
}
-static __inline__ void node_free(struct fib6_node * fn)
+static __inline__ void node_free(struct fib6_node *fn)
{
kmem_cache_free(fib6_node_kmem, fn);
}
@@ -292,7 +287,7 @@ static int fib6_dump_node(struct fib6_walker_t *w)
static void fib6_dump_end(struct netlink_callback *cb)
{
- struct fib6_walker_t *w = (void*)cb->args[2];
+ struct fib6_walker_t *w = (void *)cb->args[2];
if (w) {
if (cb->args[4]) {
@@ -302,7 +297,7 @@ static void fib6_dump_end(struct netlink_callback *cb)
cb->args[2] = 0;
kfree(w);
}
- cb->done = (void*)cb->args[3];
+ cb->done = (void *)cb->args[3];
cb->args[1] = 3;
}
@@ -485,7 +480,7 @@ static struct fib6_node *fib6_add_1(struct fib6_node *root,
fn->fn_sernum = sernum;
dir = addr_bit_set(addr, fn->fn_bit);
pn = fn;
- fn = dir ? fn->right: fn->left;
+ fn = dir ? fn->right : fn->left;
} while (fn);
if (!allow_create) {
@@ -638,12 +633,41 @@ static inline bool rt6_qualify_for_ecmp(struct rt6_info *rt)
RTF_GATEWAY;
}
+static int fib6_commit_metrics(struct dst_entry *dst,
+ struct nlattr *mx, int mx_len)
+{
+ struct nlattr *nla;
+ int remaining;
+ u32 *mp;
+
+ if (dst->flags & DST_HOST) {
+ mp = dst_metrics_write_ptr(dst);
+ } else {
+ mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+ if (!mp)
+ return -ENOMEM;
+ dst_init_metrics(dst, mp, 0);
+ }
+
+ nla_for_each_attr(nla, mx, mx_len, remaining) {
+ int type = nla_type(nla);
+
+ if (type) {
+ if (type > RTAX_MAX)
+ return -EINVAL;
+
+ mp[type - 1] = nla_get_u32(nla);
+ }
+ }
+ return 0;
+}
+
/*
* Insert routing information in a node.
*/
static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
- struct nl_info *info)
+ struct nl_info *info, struct nlattr *mx, int mx_len)
{
struct rt6_info *iter = NULL;
struct rt6_info **ins;
@@ -653,6 +677,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
(info->nlh->nlmsg_flags & NLM_F_CREATE));
int found = 0;
bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
+ int err;
ins = &fn->leaf;
@@ -751,6 +776,11 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
pr_warn("NLM_F_CREATE should be set when creating new route\n");
add:
+ if (mx) {
+ err = fib6_commit_metrics(&rt->dst, mx, mx_len);
+ if (err)
+ return err;
+ }
rt->dst.rt6_next = iter;
*ins = rt;
rt->rt6i_node = fn;
@@ -770,6 +800,11 @@ add:
pr_warn("NLM_F_REPLACE set, but no existing node found!\n");
return -ENOENT;
}
+ if (mx) {
+ err = fib6_commit_metrics(&rt->dst, mx, mx_len);
+ if (err)
+ return err;
+ }
*ins = rt;
rt->rt6i_node = fn;
rt->dst.rt6_next = iter->dst.rt6_next;
@@ -806,7 +841,8 @@ void fib6_force_start_gc(struct net *net)
* with source addr info in sub-trees
*/
-int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info)
+int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info,
+ struct nlattr *mx, int mx_len)
{
struct fib6_node *fn, *pn = NULL;
int err = -ENOMEM;
@@ -900,11 +936,11 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info)
}
#endif
- err = fib6_add_rt2node(fn, rt, info);
+ err = fib6_add_rt2node(fn, rt, info, mx, mx_len);
if (!err) {
fib6_start_gc(info->nl_net, rt);
if (!(rt->rt6i_flags & RTF_CACHE))
- fib6_prune_clones(info->nl_net, pn, rt);
+ fib6_prune_clones(info->nl_net, pn);
}
out:
@@ -955,8 +991,8 @@ struct lookup_args {
const struct in6_addr *addr; /* search key */
};
-static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
- struct lookup_args *args)
+static struct fib6_node *fib6_lookup_1(struct fib6_node *root,
+ struct lookup_args *args)
{
struct fib6_node *fn;
__be32 dir;
@@ -1018,8 +1054,8 @@ backtrack:
return NULL;
}
-struct fib6_node * fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr,
- const struct in6_addr *saddr)
+struct fib6_node *fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
{
struct fib6_node *fn;
struct lookup_args args[] = {
@@ -1051,9 +1087,9 @@ struct fib6_node * fib6_lookup(struct fib6_node *root, const struct in6_addr *da
*/
-static struct fib6_node * fib6_locate_1(struct fib6_node *root,
- const struct in6_addr *addr,
- int plen, int offset)
+static struct fib6_node *fib6_locate_1(struct fib6_node *root,
+ const struct in6_addr *addr,
+ int plen, int offset)
{
struct fib6_node *fn;
@@ -1081,9 +1117,9 @@ static struct fib6_node * fib6_locate_1(struct fib6_node *root,
return NULL;
}
-struct fib6_node * fib6_locate(struct fib6_node *root,
- const struct in6_addr *daddr, int dst_len,
- const struct in6_addr *saddr, int src_len)
+struct fib6_node *fib6_locate(struct fib6_node *root,
+ const struct in6_addr *daddr, int dst_len,
+ const struct in6_addr *saddr, int src_len)
{
struct fib6_node *fn;
@@ -1151,8 +1187,10 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
children = 0;
child = NULL;
- if (fn->right) child = fn->right, children |= 1;
- if (fn->left) child = fn->left, children |= 2;
+ if (fn->right)
+ child = fn->right, children |= 1;
+ if (fn->left)
+ child = fn->left, children |= 2;
if (children == 3 || FIB6_SUBTREE(fn)
#ifdef CONFIG_IPV6_SUBTREES
@@ -1180,8 +1218,10 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
} else {
WARN_ON(fn->fn_flags & RTN_ROOT);
#endif
- if (pn->right == fn) pn->right = child;
- else if (pn->left == fn) pn->left = child;
+ if (pn->right == fn)
+ pn->right = child;
+ else if (pn->left == fn)
+ pn->left = child;
#if RT6_DEBUG >= 2
else
WARN_ON(1);
@@ -1213,10 +1253,10 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
w->node = child;
if (children&2) {
RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
- w->state = w->state>=FWS_R ? FWS_U : FWS_INIT;
+ w->state = w->state >= FWS_R ? FWS_U : FWS_INIT;
} else {
RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state);
- w->state = w->state>=FWS_C ? FWS_U : FWS_INIT;
+ w->state = w->state >= FWS_C ? FWS_U : FWS_INIT;
}
}
}
@@ -1314,7 +1354,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
struct rt6_info **rtp;
#if RT6_DEBUG >= 2
- if (rt->dst.obsolete>0) {
+ if (rt->dst.obsolete > 0) {
WARN_ON(fn != NULL);
return -ENOENT;
}
@@ -1334,7 +1374,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
pn = pn->parent;
}
#endif
- fib6_prune_clones(info->nl_net, pn, rt);
+ fib6_prune_clones(info->nl_net, pn);
}
/*
@@ -1418,7 +1458,7 @@ static int fib6_walk_continue(struct fib6_walker_t *w)
if (w->skip) {
w->skip--;
- continue;
+ goto skip;
}
err = w->func(w);
@@ -1428,6 +1468,7 @@ static int fib6_walk_continue(struct fib6_walker_t *w)
w->count++;
continue;
}
+skip:
w->state = FWS_U;
case FWS_U:
if (fn == w->root)
@@ -1529,27 +1570,8 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
fib6_walk(&c.w);
}
-void fib6_clean_all_ro(struct net *net, int (*func)(struct rt6_info *, void *arg),
- int prune, void *arg)
-{
- struct fib6_table *table;
- struct hlist_head *head;
- unsigned int h;
-
- rcu_read_lock();
- for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
- head = &net->ipv6.fib_table_hash[h];
- hlist_for_each_entry_rcu(table, head, tb6_hlist) {
- read_lock_bh(&table->tb6_lock);
- fib6_clean_tree(net, &table->tb6_root,
- func, prune, arg);
- read_unlock_bh(&table->tb6_lock);
- }
- }
- rcu_read_unlock();
-}
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
- int prune, void *arg)
+ void *arg)
{
struct fib6_table *table;
struct hlist_head *head;
@@ -1561,7 +1583,7 @@ void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
write_lock_bh(&table->tb6_lock);
fib6_clean_tree(net, &table->tb6_root,
- func, prune, arg);
+ func, 0, arg);
write_unlock_bh(&table->tb6_lock);
}
}
@@ -1578,10 +1600,9 @@ static int fib6_prune_clone(struct rt6_info *rt, void *arg)
return 0;
}
-static void fib6_prune_clones(struct net *net, struct fib6_node *fn,
- struct rt6_info *rt)
+static void fib6_prune_clones(struct net *net, struct fib6_node *fn)
{
- fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt);
+ fib6_clean_tree(net, fn, fib6_prune_clone, 1, NULL);
}
/*
@@ -1655,7 +1676,7 @@ void fib6_run_gc(unsigned long expires, struct net *net, bool force)
gc_args.more = icmp6_dst_gc();
- fib6_clean_all(net, fib6_age, 0, NULL);
+ fib6_clean_all(net, fib6_age, NULL);
now = jiffies;
net->ipv6.ip6_rt_last_gc = now;
@@ -1726,7 +1747,7 @@ out_rt6_stats:
kfree(net->ipv6.rt6_stats);
out_timer:
return -ENOMEM;
- }
+}
static void fib6_net_exit(struct net *net)
{
@@ -1782,3 +1803,189 @@ void fib6_gc_cleanup(void)
unregister_pernet_subsys(&fib6_net_ops);
kmem_cache_destroy(fib6_node_kmem);
}
+
+#ifdef CONFIG_PROC_FS
+
+struct ipv6_route_iter {
+ struct seq_net_private p;
+ struct fib6_walker_t w;
+ loff_t skip;
+ struct fib6_table *tbl;
+ __u32 sernum;
+};
+
+static int ipv6_route_seq_show(struct seq_file *seq, void *v)
+{
+ struct rt6_info *rt = v;
+ struct ipv6_route_iter *iter = seq->private;
+
+ seq_printf(seq, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ seq_printf(seq, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
+#else
+ seq_puts(seq, "00000000000000000000000000000000 00 ");
+#endif
+ if (rt->rt6i_flags & RTF_GATEWAY)
+ seq_printf(seq, "%pi6", &rt->rt6i_gateway);
+ else
+ seq_puts(seq, "00000000000000000000000000000000");
+
+ seq_printf(seq, " %08x %08x %08x %08x %8s\n",
+ rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
+ rt->dst.__use, rt->rt6i_flags,
+ rt->dst.dev ? rt->dst.dev->name : "");
+ iter->w.leaf = NULL;
+ return 0;
+}
+
+static int ipv6_route_yield(struct fib6_walker_t *w)
+{
+ struct ipv6_route_iter *iter = w->args;
+
+ if (!iter->skip)
+ return 1;
+
+ do {
+ iter->w.leaf = iter->w.leaf->dst.rt6_next;
+ iter->skip--;
+ if (!iter->skip && iter->w.leaf)
+ return 1;
+ } while (iter->w.leaf);
+
+ return 0;
+}
+
+static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter)
+{
+ memset(&iter->w, 0, sizeof(iter->w));
+ iter->w.func = ipv6_route_yield;
+ iter->w.root = &iter->tbl->tb6_root;
+ iter->w.state = FWS_INIT;
+ iter->w.node = iter->w.root;
+ iter->w.args = iter;
+ iter->sernum = iter->w.root->fn_sernum;
+ INIT_LIST_HEAD(&iter->w.lh);
+ fib6_walker_link(&iter->w);
+}
+
+static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl,
+ struct net *net)
+{
+ unsigned int h;
+ struct hlist_node *node;
+
+ if (tbl) {
+ h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1;
+ node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist));
+ } else {
+ h = 0;
+ node = NULL;
+ }
+
+ while (!node && h < FIB6_TABLE_HASHSZ) {
+ node = rcu_dereference_bh(
+ hlist_first_rcu(&net->ipv6.fib_table_hash[h++]));
+ }
+ return hlist_entry_safe(node, struct fib6_table, tb6_hlist);
+}
+
+static void ipv6_route_check_sernum(struct ipv6_route_iter *iter)
+{
+ if (iter->sernum != iter->w.root->fn_sernum) {
+ iter->sernum = iter->w.root->fn_sernum;
+ iter->w.state = FWS_INIT;
+ iter->w.node = iter->w.root;
+ WARN_ON(iter->w.skip);
+ iter->w.skip = iter->w.count;
+ }
+}
+
+static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ int r;
+ struct rt6_info *n;
+ struct net *net = seq_file_net(seq);
+ struct ipv6_route_iter *iter = seq->private;
+
+ if (!v)
+ goto iter_table;
+
+ n = ((struct rt6_info *)v)->dst.rt6_next;
+ if (n) {
+ ++*pos;
+ return n;
+ }
+
+iter_table:
+ ipv6_route_check_sernum(iter);
+ read_lock(&iter->tbl->tb6_lock);
+ r = fib6_walk_continue(&iter->w);
+ read_unlock(&iter->tbl->tb6_lock);
+ if (r > 0) {
+ if (v)
+ ++*pos;
+ return iter->w.leaf;
+ } else if (r < 0) {
+ fib6_walker_unlink(&iter->w);
+ return NULL;
+ }
+ fib6_walker_unlink(&iter->w);
+
+ iter->tbl = ipv6_route_seq_next_table(iter->tbl, net);
+ if (!iter->tbl)
+ return NULL;
+
+ ipv6_route_seq_setup_walk(iter);
+ goto iter_table;
+}
+
+static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU_BH)
+{
+ struct net *net = seq_file_net(seq);
+ struct ipv6_route_iter *iter = seq->private;
+
+ rcu_read_lock_bh();
+ iter->tbl = ipv6_route_seq_next_table(NULL, net);
+ iter->skip = *pos;
+
+ if (iter->tbl) {
+ ipv6_route_seq_setup_walk(iter);
+ return ipv6_route_seq_next(seq, NULL, pos);
+ } else {
+ return NULL;
+ }
+}
+
+static bool ipv6_route_iter_active(struct ipv6_route_iter *iter)
+{
+ struct fib6_walker_t *w = &iter->w;
+ return w->node && !(w->state == FWS_U && w->node == w->root);
+}
+
+static void ipv6_route_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU_BH)
+{
+ struct ipv6_route_iter *iter = seq->private;
+
+ if (ipv6_route_iter_active(iter))
+ fib6_walker_unlink(&iter->w);
+
+ rcu_read_unlock_bh();
+}
+
+static const struct seq_operations ipv6_route_seq_ops = {
+ .start = ipv6_route_seq_start,
+ .next = ipv6_route_seq_next,
+ .stop = ipv6_route_seq_stop,
+ .show = ipv6_route_seq_show
+};
+
+int ipv6_route_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &ipv6_route_seq_ops,
+ sizeof(struct ipv6_route_iter));
+}
+
+#endif /* CONFIG_PROC_FS */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 17:59:10 +0000