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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-08-01 08:54:47 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-01 00:26:22 -0700
commit46b3a421903aa2a4bc9731ca4663cee3ea869dab (patch)
tree79fe45a2dcc4055edddf87069ce278f3ce78176f
parent378307217ed9c318212ec3050d38d0e34b77604c (diff)
downloadop-kernel-dev-46b3a421903aa2a4bc9731ca4663cee3ea869dab.zip
op-kernel-dev-46b3a421903aa2a4bc9731ca4663cee3ea869dab.tar.gz
ipv6: fib6_rules should return exact return value
With the addition of the suppress operation (7764a45a8f1fe74d4f7d301eaca2e558e7e2831a ("fib_rules: add .suppress operation") we rely on accurate error reporting of the fib_rules.actions. fib6_rule_action always returned -EAGAIN in case we could not find a matching route and 0 if a rule was matched. This also included a match for blackhole or prohibited rule actions which could get suppressed by the new logic. So adapt fib6_rule_action to always return the correct error code as its counterpart fib4_rule_action does. This also fixes a possiblity of nullptr-deref where we don't find a table, thus rt == NULL. Because the condition rt != ip6_null_entry still holdes it seems we could later get a nullptr bug on dereference rt->dst. v2: a) Fixed a brain fart in the commit msg (the rule => a table, etc). No changes to the patch. Cc: Stefan Tomanek <stefan.tomanek@wertarbyte.de> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/fib6_rules.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index e64e6a5..554a4fb 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -55,26 +55,33 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
struct fib6_table *table;
struct net *net = rule->fr_net;
pol_lookup_t lookup = arg->lookup_ptr;
+ int err = 0;
switch (rule->action) {
case FR_ACT_TO_TBL:
break;
case FR_ACT_UNREACHABLE:
+ err = -ENETUNREACH;
rt = net->ipv6.ip6_null_entry;
goto discard_pkt;
default:
case FR_ACT_BLACKHOLE:
+ err = -EINVAL;
rt = net->ipv6.ip6_blk_hole_entry;
goto discard_pkt;
case FR_ACT_PROHIBIT:
+ err = -EACCES;
rt = net->ipv6.ip6_prohibit_entry;
goto discard_pkt;
}
table = fib6_get_table(net, rule->table);
- if (table)
- rt = lookup(net, table, flp6, flags);
+ if (!table) {
+ err = -EAGAIN;
+ goto out;
+ }
+ rt = lookup(net, table, flp6, flags);
if (rt != net->ipv6.ip6_null_entry) {
struct fib6_rule *r = (struct fib6_rule *)rule;
@@ -101,6 +108,7 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
}
again:
ip6_rt_put(rt);
+ err = -EAGAIN;
rt = NULL;
goto out;
@@ -108,7 +116,7 @@ discard_pkt:
dst_hold(&rt->dst);
out:
arg->result = rt;
- return rt == NULL ? -EAGAIN : 0;
+ return err;
}
static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
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