[IPV6]: Increase number of possible routing tables to 2^32
Increase number of possible routing tables to 2^32 by replacing iterations over all possible table IDs by hash table walking. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
1af5a8c4a1
commit
1b43af5480
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@ -137,6 +137,13 @@ extern int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *a
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extern int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
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extern int inet6_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
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struct rt6_rtnl_dump_arg
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{
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struct sk_buff *skb;
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struct netlink_callback *cb;
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};
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extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
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extern void rt6_ifdown(struct net_device *dev);
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extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
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@ -158,7 +158,26 @@ static struct fib6_table fib6_main_tbl = {
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};
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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#define FIB_TABLE_HASHSZ 256
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#else
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#define FIB_TABLE_HASHSZ 1
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#endif
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static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
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static void fib6_link_table(struct fib6_table *tb)
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{
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unsigned int h;
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h = tb->tb6_id & (FIB_TABLE_HASHSZ - 1);
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/*
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* No protection necessary, this is the only list mutatation
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* operation, tables never disappear once they exist.
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*/
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hlist_add_head_rcu(&tb->tb6_hlist, &fib_table_hash[h]);
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}
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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static struct fib6_table fib6_local_tbl = {
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.tb6_id = RT6_TABLE_LOCAL,
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.tb6_lock = RW_LOCK_UNLOCKED,
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@ -168,9 +187,6 @@ static struct fib6_table fib6_local_tbl = {
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},
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};
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#define FIB_TABLE_HASHSZ 256
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static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
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static struct fib6_table *fib6_alloc_table(u32 id)
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{
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struct fib6_table *table;
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@ -186,19 +202,6 @@ static struct fib6_table *fib6_alloc_table(u32 id)
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return table;
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}
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static void fib6_link_table(struct fib6_table *tb)
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{
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unsigned int h;
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h = tb->tb6_id & (FIB_TABLE_HASHSZ - 1);
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/*
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* No protection necessary, this is the only list mutatation
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* operation, tables never disappear once they exist.
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*/
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hlist_add_head_rcu(&tb->tb6_hlist, &fib_table_hash[h]);
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}
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struct fib6_table *fib6_new_table(u32 id)
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{
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struct fib6_table *tb;
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@ -263,10 +266,135 @@ struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
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static void __init fib6_tables_init(void)
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{
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fib6_link_table(&fib6_main_tbl);
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}
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#endif
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static int fib6_dump_node(struct fib6_walker_t *w)
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{
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int res;
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struct rt6_info *rt;
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for (rt = w->leaf; rt; rt = rt->u.next) {
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res = rt6_dump_route(rt, w->args);
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if (res < 0) {
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/* Frame is full, suspend walking */
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w->leaf = rt;
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return 1;
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}
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BUG_TRAP(res!=0);
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}
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w->leaf = NULL;
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return 0;
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}
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static void fib6_dump_end(struct netlink_callback *cb)
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{
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struct fib6_walker_t *w = (void*)cb->args[2];
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if (w) {
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cb->args[2] = 0;
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kfree(w);
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}
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cb->done = (void*)cb->args[3];
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cb->args[1] = 3;
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}
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static int fib6_dump_done(struct netlink_callback *cb)
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{
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fib6_dump_end(cb);
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return cb->done ? cb->done(cb) : 0;
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}
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static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct fib6_walker_t *w;
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int res;
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w = (void *)cb->args[2];
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w->root = &table->tb6_root;
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if (cb->args[4] == 0) {
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read_lock_bh(&table->tb6_lock);
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res = fib6_walk(w);
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read_unlock_bh(&table->tb6_lock);
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if (res > 0)
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cb->args[4] = 1;
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} else {
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read_lock_bh(&table->tb6_lock);
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res = fib6_walk_continue(w);
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read_unlock_bh(&table->tb6_lock);
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if (res != 0) {
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if (res < 0)
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fib6_walker_unlink(w);
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goto end;
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}
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fib6_walker_unlink(w);
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cb->args[4] = 0;
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}
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end:
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return res;
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}
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int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
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{
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unsigned int h, s_h;
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unsigned int e = 0, s_e;
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struct rt6_rtnl_dump_arg arg;
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struct fib6_walker_t *w;
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struct fib6_table *tb;
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struct hlist_node *node;
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int res = 0;
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s_h = cb->args[0];
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s_e = cb->args[1];
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w = (void *)cb->args[2];
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if (w == NULL) {
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/* New dump:
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*
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* 1. hook callback destructor.
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*/
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cb->args[3] = (long)cb->done;
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cb->done = fib6_dump_done;
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/*
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* 2. allocate and initialize walker.
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*/
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w = kzalloc(sizeof(*w), GFP_ATOMIC);
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if (w == NULL)
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return -ENOMEM;
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w->func = fib6_dump_node;
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cb->args[2] = (long)w;
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}
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arg.skb = skb;
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arg.cb = cb;
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w->args = &arg;
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for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
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e = 0;
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hlist_for_each_entry(tb, node, &fib_table_hash[h], tb6_hlist) {
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if (e < s_e)
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goto next;
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res = fib6_dump_table(tb, skb, cb);
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if (res != 0)
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goto out;
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next:
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e++;
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}
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}
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out:
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cb->args[1] = e;
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cb->args[0] = h;
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res = res < 0 ? res : skb->len;
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if (res <= 0)
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fib6_dump_end(cb);
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return res;
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}
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/*
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* Routing Table
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@ -1187,17 +1315,20 @@ static void fib6_clean_tree(struct fib6_node *root,
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void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
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int prune, void *arg)
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{
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int i;
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struct fib6_table *table;
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struct hlist_node *node;
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unsigned int h;
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for (i = FIB6_TABLE_MIN; i <= FIB6_TABLE_MAX; i++) {
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table = fib6_get_table(i);
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if (table != NULL) {
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rcu_read_lock();
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for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
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hlist_for_each_entry_rcu(table, node, &fib_table_hash[h],
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tb6_hlist) {
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write_lock_bh(&table->tb6_lock);
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fib6_clean_tree(&table->tb6_root, func, prune, arg);
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write_unlock_bh(&table->tb6_lock);
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}
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}
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rcu_read_unlock();
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}
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static int fib6_prune_clone(struct rt6_info *rt, void *arg)
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128
net/ipv6/route.c
128
net/ipv6/route.c
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@ -1874,12 +1874,6 @@ int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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rtm_get_table(arg, r->rtm_table));
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}
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struct rt6_rtnl_dump_arg
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{
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struct sk_buff *skb;
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struct netlink_callback *cb;
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};
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static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
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struct in6_addr *dst, struct in6_addr *src,
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int iif, int type, u32 pid, u32 seq,
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@ -1976,7 +1970,7 @@ rtattr_failure:
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return -1;
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}
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static int rt6_dump_route(struct rt6_info *rt, void *p_arg)
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int rt6_dump_route(struct rt6_info *rt, void *p_arg)
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{
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struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
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int prefix;
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@ -1992,126 +1986,6 @@ static int rt6_dump_route(struct rt6_info *rt, void *p_arg)
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prefix, NLM_F_MULTI);
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}
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static int fib6_dump_node(struct fib6_walker_t *w)
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{
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int res;
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struct rt6_info *rt;
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for (rt = w->leaf; rt; rt = rt->u.next) {
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res = rt6_dump_route(rt, w->args);
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if (res < 0) {
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/* Frame is full, suspend walking */
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w->leaf = rt;
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return 1;
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}
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BUG_TRAP(res!=0);
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}
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w->leaf = NULL;
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return 0;
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}
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static void fib6_dump_end(struct netlink_callback *cb)
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{
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struct fib6_walker_t *w = (void*)cb->args[0];
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if (w) {
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cb->args[0] = 0;
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kfree(w);
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}
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cb->done = (void*)cb->args[1];
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cb->args[1] = 0;
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}
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static int fib6_dump_done(struct netlink_callback *cb)
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{
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fib6_dump_end(cb);
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return cb->done ? cb->done(cb) : 0;
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}
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int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct fib6_table *table;
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struct rt6_rtnl_dump_arg arg;
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struct fib6_walker_t *w;
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int i, res = 0;
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arg.skb = skb;
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arg.cb = cb;
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/*
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* cb->args[0] = pointer to walker structure
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* cb->args[1] = saved cb->done() pointer
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* cb->args[2] = current table being dumped
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*/
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w = (void*)cb->args[0];
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if (w == NULL) {
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/* New dump:
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*
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* 1. hook callback destructor.
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*/
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cb->args[1] = (long)cb->done;
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cb->done = fib6_dump_done;
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/*
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* 2. allocate and initialize walker.
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*/
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w = kzalloc(sizeof(*w), GFP_ATOMIC);
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if (w == NULL)
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return -ENOMEM;
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w->func = fib6_dump_node;
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w->args = &arg;
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cb->args[0] = (long)w;
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cb->args[2] = FIB6_TABLE_MIN;
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} else {
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w->args = &arg;
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i = cb->args[2];
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if (i > FIB6_TABLE_MAX)
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goto end;
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table = fib6_get_table(i);
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if (table != NULL) {
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read_lock_bh(&table->tb6_lock);
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w->root = &table->tb6_root;
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res = fib6_walk_continue(w);
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read_unlock_bh(&table->tb6_lock);
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if (res != 0) {
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if (res < 0)
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fib6_walker_unlink(w);
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goto end;
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}
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}
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fib6_walker_unlink(w);
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cb->args[2] = ++i;
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}
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for (i = cb->args[2]; i <= FIB6_TABLE_MAX; i++) {
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table = fib6_get_table(i);
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if (table == NULL)
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continue;
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read_lock_bh(&table->tb6_lock);
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w->root = &table->tb6_root;
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res = fib6_walk(w);
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read_unlock_bh(&table->tb6_lock);
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if (res)
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break;
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}
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end:
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cb->args[2] = i;
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res = res < 0 ? res : skb->len;
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/* res < 0 is an error. (really, impossible)
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res == 0 means that dump is complete, but skb still can contain data.
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res > 0 dump is not complete, but frame is full.
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*/
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/* Destroy walker, if dump of this table is complete. */
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if (res <= 0)
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fib6_dump_end(cb);
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return res;
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}
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int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
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{
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struct rtattr **rta = arg;
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