* Yuji SEKIYA @USAGI: Support default route on router node;
* remove ip6_null_entry from the top of
* routing table.
+ * Ville Nuorvala: Fixed routing subtrees.
*/
-#include <linux/config.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/init.h>
+#include <linux/list.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
struct rt6_statistics rt6_stats;
-static kmem_cache_t * fib6_node_kmem __read_mostly;
+static struct kmem_cache * fib6_node_kmem __read_mostly;
enum fib_walk_state_t
{
void *arg;
};
-DEFINE_RWLOCK(fib6_walker_lock);
-
+static DEFINE_RWLOCK(fib6_walker_lock);
#ifdef CONFIG_IPV6_SUBTREES
#define FWS_INIT FWS_S
-#define SUBTREE(fn) ((fn)->subtree)
#else
#define FWS_INIT FWS_L
-#define SUBTREE(fn) NULL
#endif
static void fib6_prune_clones(struct fib6_node *fn, struct rt6_info *rt);
+static struct rt6_info * fib6_find_prefix(struct fib6_node *fn);
static struct fib6_node * fib6_repair_tree(struct fib6_node *fn);
+static int fib6_walk(struct fib6_walker_t *w);
+static int fib6_walk_continue(struct fib6_walker_t *w);
/*
* A routing update causes an increase of the serial number on the
static DEFINE_TIMER(ip6_fib_timer, fib6_run_gc, 0, 0);
-struct fib6_walker_t fib6_walker_list = {
+static struct fib6_walker_t fib6_walker_list = {
.prev = &fib6_walker_list,
.next = &fib6_walker_list,
};
#define FOR_WALKERS(w) for ((w)=fib6_walker_list.next; (w) != &fib6_walker_list; (w)=(w)->next)
+static inline void fib6_walker_link(struct fib6_walker_t *w)
+{
+ write_lock_bh(&fib6_walker_lock);
+ w->next = fib6_walker_list.next;
+ w->prev = &fib6_walker_list;
+ w->next->prev = w;
+ w->prev->next = w;
+ write_unlock_bh(&fib6_walker_lock);
+}
+
+static inline void fib6_walker_unlink(struct fib6_walker_t *w)
+{
+ write_lock_bh(&fib6_walker_lock);
+ w->next->prev = w->prev;
+ w->prev->next = w->next;
+ w->prev = w->next = w;
+ write_unlock_bh(&fib6_walker_lock);
+}
static __inline__ u32 fib6_new_sernum(void)
{
u32 n = ++rt_sernum;
* test bit
*/
-static __inline__ int addr_bit_set(void *token, int fn_bit)
+static __inline__ __be32 addr_bit_set(void *token, int fn_bit)
{
- __u32 *addr = token;
+ __be32 *addr = token;
return htonl(1 << ((~fn_bit)&0x1F)) & addr[fn_bit>>5];
}
{
struct fib6_node *fn;
- if ((fn = kmem_cache_alloc(fib6_node_kmem, SLAB_ATOMIC)) != NULL)
+ if ((fn = kmem_cache_alloc(fib6_node_kmem, GFP_ATOMIC)) != NULL)
memset(fn, 0, sizeof(struct fib6_node));
return fn;
dst_free(&rt->u.dst);
}
+static struct fib6_table fib6_main_tbl = {
+ .tb6_id = RT6_TABLE_MAIN,
+ .tb6_root = {
+ .leaf = &ip6_null_entry,
+ .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
+ },
+};
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB_TABLE_HASHSZ 256
+#else
+#define FIB_TABLE_HASHSZ 1
+#endif
+static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
+
+static void fib6_link_table(struct fib6_table *tb)
+{
+ unsigned int h;
+
+ /*
+ * Initialize table lock at a single place to give lockdep a key,
+ * tables aren't visible prior to being linked to the list.
+ */
+ rwlock_init(&tb->tb6_lock);
+
+ h = tb->tb6_id & (FIB_TABLE_HASHSZ - 1);
+
+ /*
+ * No protection necessary, this is the only list mutatation
+ * operation, tables never disappear once they exist.
+ */
+ hlist_add_head_rcu(&tb->tb6_hlist, &fib_table_hash[h]);
+}
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+static struct fib6_table fib6_local_tbl = {
+ .tb6_id = RT6_TABLE_LOCAL,
+ .tb6_root = {
+ .leaf = &ip6_null_entry,
+ .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
+ },
+};
+
+static struct fib6_table *fib6_alloc_table(u32 id)
+{
+ struct fib6_table *table;
+
+ table = kzalloc(sizeof(*table), GFP_ATOMIC);
+ if (table != NULL) {
+ table->tb6_id = id;
+ table->tb6_root.leaf = &ip6_null_entry;
+ table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+ }
+
+ return table;
+}
+
+struct fib6_table *fib6_new_table(u32 id)
+{
+ struct fib6_table *tb;
+
+ if (id == 0)
+ id = RT6_TABLE_MAIN;
+ tb = fib6_get_table(id);
+ if (tb)
+ return tb;
+
+ tb = fib6_alloc_table(id);
+ if (tb != NULL)
+ fib6_link_table(tb);
+
+ return tb;
+}
+
+struct fib6_table *fib6_get_table(u32 id)
+{
+ struct fib6_table *tb;
+ struct hlist_node *node;
+ unsigned int h;
+
+ if (id == 0)
+ id = RT6_TABLE_MAIN;
+ h = id & (FIB_TABLE_HASHSZ - 1);
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb6_hlist) {
+ if (tb->tb6_id == id) {
+ rcu_read_unlock();
+ return tb;
+ }
+ }
+ rcu_read_unlock();
+
+ return NULL;
+}
+
+static void __init fib6_tables_init(void)
+{
+ fib6_link_table(&fib6_main_tbl);
+ fib6_link_table(&fib6_local_tbl);
+}
+
+#else
+
+struct fib6_table *fib6_new_table(u32 id)
+{
+ return fib6_get_table(id);
+}
+
+struct fib6_table *fib6_get_table(u32 id)
+{
+ return &fib6_main_tbl;
+}
+
+struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
+ pol_lookup_t lookup)
+{
+ return (struct dst_entry *) lookup(&fib6_main_tbl, fl, flags);
+}
+
+static void __init fib6_tables_init(void)
+{
+ fib6_link_table(&fib6_main_tbl);
+}
+
+#endif
+
+static int fib6_dump_node(struct fib6_walker_t *w)
+{
+ int res;
+ struct rt6_info *rt;
+
+ for (rt = w->leaf; rt; rt = rt->u.next) {
+ res = rt6_dump_route(rt, w->args);
+ if (res < 0) {
+ /* Frame is full, suspend walking */
+ w->leaf = rt;
+ return 1;
+ }
+ BUG_TRAP(res!=0);
+ }
+ w->leaf = NULL;
+ return 0;
+}
+
+static void fib6_dump_end(struct netlink_callback *cb)
+{
+ struct fib6_walker_t *w = (void*)cb->args[2];
+
+ if (w) {
+ cb->args[2] = 0;
+ kfree(w);
+ }
+ cb->done = (void*)cb->args[3];
+ cb->args[1] = 3;
+}
+
+static int fib6_dump_done(struct netlink_callback *cb)
+{
+ fib6_dump_end(cb);
+ return cb->done ? cb->done(cb) : 0;
+}
+
+static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct fib6_walker_t *w;
+ int res;
+
+ w = (void *)cb->args[2];
+ w->root = &table->tb6_root;
+
+ if (cb->args[4] == 0) {
+ read_lock_bh(&table->tb6_lock);
+ res = fib6_walk(w);
+ read_unlock_bh(&table->tb6_lock);
+ if (res > 0)
+ cb->args[4] = 1;
+ } else {
+ read_lock_bh(&table->tb6_lock);
+ res = fib6_walk_continue(w);
+ read_unlock_bh(&table->tb6_lock);
+ if (res != 0) {
+ if (res < 0)
+ fib6_walker_unlink(w);
+ goto end;
+ }
+ fib6_walker_unlink(w);
+ cb->args[4] = 0;
+ }
+end:
+ return res;
+}
+
+int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ unsigned int h, s_h;
+ unsigned int e = 0, s_e;
+ struct rt6_rtnl_dump_arg arg;
+ struct fib6_walker_t *w;
+ struct fib6_table *tb;
+ struct hlist_node *node;
+ int res = 0;
+
+ s_h = cb->args[0];
+ s_e = cb->args[1];
+
+ w = (void *)cb->args[2];
+ if (w == NULL) {
+ /* New dump:
+ *
+ * 1. hook callback destructor.
+ */
+ cb->args[3] = (long)cb->done;
+ cb->done = fib6_dump_done;
+
+ /*
+ * 2. allocate and initialize walker.
+ */
+ w = kzalloc(sizeof(*w), GFP_ATOMIC);
+ if (w == NULL)
+ return -ENOMEM;
+ w->func = fib6_dump_node;
+ cb->args[2] = (long)w;
+ }
+
+ arg.skb = skb;
+ arg.cb = cb;
+ w->args = &arg;
+
+ for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
+ e = 0;
+ hlist_for_each_entry(tb, node, &fib_table_hash[h], tb6_hlist) {
+ if (e < s_e)
+ goto next;
+ res = fib6_dump_table(tb, skb, cb);
+ if (res != 0)
+ goto out;
+next:
+ e++;
+ }
+ }
+out:
+ cb->args[1] = e;
+ cb->args[0] = h;
+
+ res = res < 0 ? res : skb->len;
+ if (res <= 0)
+ fib6_dump_end(cb);
+ return res;
+}
/*
* Routing Table
struct fib6_node *pn = NULL;
struct rt6key *key;
int bit;
- int dir = 0;
+ __be32 dir = 0;
__u32 sernum = fib6_new_sernum();
RT6_TRACE("fib6_add_1\n");
*/
static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
- struct nlmsghdr *nlh, struct netlink_skb_parms *req)
+ struct nl_info *info)
{
struct rt6_info *iter = NULL;
struct rt6_info **ins;
ins = &iter->u.next;
}
+ /* Reset round-robin state, if necessary */
+ if (ins == &fn->leaf)
+ fn->rr_ptr = NULL;
+
/*
* insert node
*/
*ins = rt;
rt->rt6i_node = fn;
atomic_inc(&rt->rt6i_ref);
- inet6_rt_notify(RTM_NEWROUTE, rt, nlh, req);
+ inet6_rt_notify(RTM_NEWROUTE, rt, info);
rt6_stats.fib_rt_entries++;
if ((fn->fn_flags & RTN_RTINFO) == 0) {
* with source addr info in sub-trees
*/
-int fib6_add(struct fib6_node *root, struct rt6_info *rt,
- struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
+int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info)
{
- struct fib6_node *fn;
+ struct fib6_node *fn, *pn = NULL;
int err = -ENOMEM;
fn = fib6_add_1(root, &rt->rt6i_dst.addr, sizeof(struct in6_addr),
if (fn == NULL)
goto out;
+ pn = fn;
+
#ifdef CONFIG_IPV6_SUBTREES
if (rt->rt6i_src.plen) {
struct fib6_node *sn;
/* Now link new subtree to main tree */
sfn->parent = fn;
fn->subtree = sfn;
- if (fn->leaf == NULL) {
- fn->leaf = rt;
- atomic_inc(&rt->rt6i_ref);
- }
} else {
sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr,
sizeof(struct in6_addr), rt->rt6i_src.plen,
goto st_failure;
}
+ if (fn->leaf == NULL) {
+ fn->leaf = rt;
+ atomic_inc(&rt->rt6i_ref);
+ }
fn = sn;
}
#endif
- err = fib6_add_rt2node(fn, rt, nlh, req);
+ err = fib6_add_rt2node(fn, rt, info);
if (err == 0) {
fib6_start_gc(rt);
if (!(rt->rt6i_flags&RTF_CACHE))
- fib6_prune_clones(fn, rt);
+ fib6_prune_clones(pn, rt);
}
out:
- if (err)
+ if (err) {
+#ifdef CONFIG_IPV6_SUBTREES
+ /*
+ * If fib6_add_1 has cleared the old leaf pointer in the
+ * super-tree leaf node we have to find a new one for it.
+ */
+ if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) {
+ pn->leaf = fib6_find_prefix(pn);
+#if RT6_DEBUG >= 2
+ if (!pn->leaf) {
+ BUG_TRAP(pn->leaf != NULL);
+ pn->leaf = &ip6_null_entry;
+ }
+#endif
+ atomic_inc(&pn->leaf->rt6i_ref);
+ }
+#endif
dst_free(&rt->u.dst);
+ }
return err;
#ifdef CONFIG_IPV6_SUBTREES
struct lookup_args *args)
{
struct fib6_node *fn;
- int dir;
+ __be32 dir;
+
+ if (unlikely(args->offset == 0))
+ return NULL;
/*
* Descend on a tree
break;
}
- while ((fn->fn_flags & RTN_ROOT) == 0) {
-#ifdef CONFIG_IPV6_SUBTREES
- if (fn->subtree) {
- struct fib6_node *st;
- struct lookup_args *narg;
-
- narg = args + 1;
-
- if (narg->addr) {
- st = fib6_lookup_1(fn->subtree, narg);
-
- if (st && !(st->fn_flags & RTN_ROOT))
- return st;
- }
- }
-#endif
-
- if (fn->fn_flags & RTN_RTINFO) {
+ while(fn) {
+ if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) {
struct rt6key *key;
key = (struct rt6key *) ((u8 *) fn->leaf +
args->offset);
- if (ipv6_prefix_equal(&key->addr, args->addr, key->plen))
- return fn;
+ if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) {
+#ifdef CONFIG_IPV6_SUBTREES
+ if (fn->subtree)
+ fn = fib6_lookup_1(fn->subtree, args + 1);
+#endif
+ if (!fn || fn->fn_flags & RTN_RTINFO)
+ return fn;
+ }
}
+ if (fn->fn_flags & RTN_ROOT)
+ break;
+
fn = fn->parent;
}
struct fib6_node * fib6_lookup(struct fib6_node *root, struct in6_addr *daddr,
struct in6_addr *saddr)
{
- struct lookup_args args[2];
struct fib6_node *fn;
-
- args[0].offset = offsetof(struct rt6_info, rt6i_dst);
- args[0].addr = daddr;
-
+ struct lookup_args args[] = {
+ {
+ .offset = offsetof(struct rt6_info, rt6i_dst),
+ .addr = daddr,
+ },
#ifdef CONFIG_IPV6_SUBTREES
- args[1].offset = offsetof(struct rt6_info, rt6i_src);
- args[1].addr = saddr;
+ {
+ .offset = offsetof(struct rt6_info, rt6i_src),
+ .addr = saddr,
+ },
#endif
+ {
+ .offset = 0, /* sentinel */
+ }
+ };
- fn = fib6_lookup_1(root, args);
+ fn = fib6_lookup_1(root, daddr ? args : args + 1);
if (fn == NULL || fn->fn_flags & RTN_TL_ROOT)
fn = root;
#ifdef CONFIG_IPV6_SUBTREES
if (src_len) {
BUG_TRAP(saddr!=NULL);
- if (fn == NULL)
- fn = fn->subtree;
- if (fn)
- fn = fib6_locate_1(fn, saddr, src_len,
+ if (fn && fn->subtree)
+ fn = fib6_locate_1(fn->subtree, saddr, src_len,
offsetof(struct rt6_info, rt6i_src));
}
#endif
if(fn->right)
return fn->right->leaf;
- fn = SUBTREE(fn);
+ fn = FIB6_SUBTREE(fn);
}
return NULL;
}
if (fn->right) child = fn->right, children |= 1;
if (fn->left) child = fn->left, children |= 2;
- if (children == 3 || SUBTREE(fn)
+ if (children == 3 || FIB6_SUBTREE(fn)
#ifdef CONFIG_IPV6_SUBTREES
/* Subtree root (i.e. fn) may have one child */
|| (children && fn->fn_flags&RTN_ROOT)
pn = fn->parent;
#ifdef CONFIG_IPV6_SUBTREES
- if (SUBTREE(pn) == fn) {
+ if (FIB6_SUBTREE(pn) == fn) {
BUG_TRAP(fn->fn_flags&RTN_ROOT);
- SUBTREE(pn) = NULL;
+ FIB6_SUBTREE(pn) = NULL;
nstate = FWS_L;
} else {
BUG_TRAP(!(fn->fn_flags&RTN_ROOT));
read_unlock(&fib6_walker_lock);
node_free(fn);
- if (pn->fn_flags&RTN_RTINFO || SUBTREE(pn))
+ if (pn->fn_flags&RTN_RTINFO || FIB6_SUBTREE(pn))
return pn;
rt6_release(pn->leaf);
}
static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp,
- struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
+ struct nl_info *info)
{
struct fib6_walker_t *w;
struct rt6_info *rt = *rtp;
rt6_stats.fib_rt_entries--;
rt6_stats.fib_discarded_routes++;
+ /* Reset round-robin state, if necessary */
+ if (fn->rr_ptr == rt)
+ fn->rr_ptr = NULL;
+
/* Adjust walkers */
read_lock(&fib6_walker_lock);
FOR_WALKERS(w) {
if (atomic_read(&rt->rt6i_ref) != 1) BUG();
}
- inet6_rt_notify(RTM_DELROUTE, rt, nlh, req);
+ inet6_rt_notify(RTM_DELROUTE, rt, info);
rt6_release(rt);
}
-int fib6_del(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
+int fib6_del(struct rt6_info *rt, struct nl_info *info)
{
struct fib6_node *fn = rt->rt6i_node;
struct rt6_info **rtp;
BUG_TRAP(fn->fn_flags&RTN_RTINFO);
- if (!(rt->rt6i_flags&RTF_CACHE))
- fib6_prune_clones(fn, rt);
+ if (!(rt->rt6i_flags&RTF_CACHE)) {
+ struct fib6_node *pn = fn;
+#ifdef CONFIG_IPV6_SUBTREES
+ /* clones of this route might be in another subtree */
+ if (rt->rt6i_src.plen) {
+ while (!(pn->fn_flags&RTN_ROOT))
+ pn = pn->parent;
+ pn = pn->parent;
+ }
+#endif
+ fib6_prune_clones(pn, rt);
+ }
/*
* Walk the leaf entries looking for ourself
for (rtp = &fn->leaf; *rtp; rtp = &(*rtp)->u.next) {
if (*rtp == rt) {
- fib6_del_route(fn, rtp, nlh, _rtattr, req);
+ fib6_del_route(fn, rtp, info);
return 0;
}
}
* <0 -> walk is terminated by an error.
*/
-int fib6_walk_continue(struct fib6_walker_t *w)
+static int fib6_walk_continue(struct fib6_walker_t *w)
{
struct fib6_node *fn, *pn;
switch (w->state) {
#ifdef CONFIG_IPV6_SUBTREES
case FWS_S:
- if (SUBTREE(fn)) {
- w->node = SUBTREE(fn);
+ if (FIB6_SUBTREE(fn)) {
+ w->node = FIB6_SUBTREE(fn);
continue;
}
w->state = FWS_L;
pn = fn->parent;
w->node = pn;
#ifdef CONFIG_IPV6_SUBTREES
- if (SUBTREE(pn) == fn) {
+ if (FIB6_SUBTREE(pn) == fn) {
BUG_TRAP(fn->fn_flags&RTN_ROOT);
w->state = FWS_L;
continue;
}
}
-int fib6_walk(struct fib6_walker_t *w)
+static int fib6_walk(struct fib6_walker_t *w)
{
int res;
res = c->func(rt, c->arg);
if (res < 0) {
w->leaf = rt;
- res = fib6_del(rt, NULL, NULL, NULL);
+ res = fib6_del(rt, NULL);
if (res) {
#if RT6_DEBUG >= 2
printk(KERN_DEBUG "fib6_clean_node: del failed: rt=%p@%p err=%d\n", rt, rt->rt6i_node, res);
* ignoring pure split nodes) will be scanned.
*/
-void fib6_clean_tree(struct fib6_node *root,
- int (*func)(struct rt6_info *, void *arg),
- int prune, void *arg)
+static void fib6_clean_tree(struct fib6_node *root,
+ int (*func)(struct rt6_info *, void *arg),
+ int prune, void *arg)
{
struct fib6_cleaner_t c;
fib6_walk(&c.w);
}
+void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
+ int prune, void *arg)
+{
+ struct fib6_table *table;
+ struct hlist_node *node;
+ unsigned int h;
+
+ rcu_read_lock();
+ for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
+ hlist_for_each_entry_rcu(table, node, &fib_table_hash[h],
+ tb6_hlist) {
+ write_lock_bh(&table->tb6_lock);
+ fib6_clean_tree(&table->tb6_root, func, prune, arg);
+ write_unlock_bh(&table->tb6_lock);
+ }
+ }
+ rcu_read_unlock();
+}
+
static int fib6_prune_clone(struct rt6_info *rt, void *arg)
{
if (rt->rt6i_flags & RTF_CACHE) {
if (rt->rt6i_flags&RTF_EXPIRES && rt->rt6i_expires) {
if (time_after(now, rt->rt6i_expires)) {
RT6_TRACE("expiring %p\n", rt);
- rt6_reset_dflt_pointer(rt);
return -1;
}
gc_args.more++;
}
gc_args.more = 0;
-
- write_lock_bh(&rt6_lock);
ndisc_dst_gc(&gc_args.more);
- fib6_clean_tree(&ip6_routing_table, fib6_age, 0, NULL);
- write_unlock_bh(&rt6_lock);
+ fib6_clean_all(fib6_age, 0, NULL);
if (gc_args.more)
mod_timer(&ip6_fib_timer, jiffies + ip6_rt_gc_interval);
{
fib6_node_kmem = kmem_cache_create("fib6_nodes",
sizeof(struct fib6_node),
- 0, SLAB_HWCACHE_ALIGN,
+ 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
NULL, NULL);
- if (!fib6_node_kmem)
- panic("cannot create fib6_nodes cache");
+
+ fib6_tables_init();
}
void fib6_gc_cleanup(void)
git://git.onelab.eu / linux-2.6.git / blobdiff