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ipv6: prepare fib6_locate() for exception table

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fib6_locate() is used to find the fib6_node according to the passed in
prefix address key. It currently tries to find the fib6_node with the
exact match of the passed in key. However, when we move cached routes
into the exception table, fib6_locate() will fail to find the fib6_node
for it as the cached routes will be stored in the exception table under
the fib6_node with the longest prefix match of the cache's dst addr key.
This commit adds a new parameter to let the caller specify if it needs
exact match or longest prefix match.
Right now, all callers still does exact match when calling
fib6_locate(). It will be changed in later commit where exception table
is hooked up to store cached routes.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-10-06 12:06:02 -07:00 • committed by David S. Miller
parent c757faa8bf
commit 38fbeeeecc
4 changed files with 29 additions and 11 deletions
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5
net/ipv6/route.c
View file

@ -2800,7 +2800,8 @@ static int ip6_route_del(struct fib6_config *cfg,
fn = fib6_locate(&table->tb6_root,
&cfg->fc_dst, cfg->fc_dst_len,
&cfg->fc_src, cfg->fc_src_len);
&cfg->fc_src, cfg->fc_src_len,
true);
if (fn) {
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
@ -3009,7 +3010,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
return NULL;
read_lock_bh(&table->tb6_lock);
fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
if (!fn)
goto out;