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| author | David S. Miller <davem@sunset.davemloft.net> | 2006-08-25 15:46:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 15:18:05 -0700 |
| commit | acba48e1a3c95082af1e12c5efaaca3506103a92 (patch) | |
| tree | a6c001ca19cfb67427aaec822952c32bb0916568 | |
| parent | 65e3d72654d9a33cdccd5c19777a5515ae9dd37d (diff) | |
| download | linux-acba48e1a3c95082af1e12c5efaaca3506103a92.tar.bz2 | |
[XFRM]: Respect priority in policy lookups.
Even if we find an exact match in the hash table,
we must inspect the inexact list to look for a match
with a better priority.
Noticed by Masahide NAKAMURA <nakam@linux-ipv6.org>.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index b446ca31fecc..1cf3209cdf4b 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -908,6 +908,7 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, xfrm_address_t *daddr, *saddr; struct hlist_node *entry; struct hlist_head *chain; + u32 priority = ~0U; daddr = xfrm_flowi_daddr(fl, family); saddr = xfrm_flowi_saddr(fl, family); @@ -919,21 +920,21 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, ret = NULL; hlist_for_each_entry(pol, entry, chain, bydst) { if (xfrm_policy_match(pol, fl, type, family, dir)) { - xfrm_pol_hold(pol); ret = pol; + priority = ret->priority; break; } } - if (!ret) { - chain = &xfrm_policy_inexact[dir]; - hlist_for_each_entry(pol, entry, chain, bydst) { - if (xfrm_policy_match(pol, fl, type, family, dir)) { - xfrm_pol_hold(pol); - ret = pol; - break; - } + chain = &xfrm_policy_inexact[dir]; + hlist_for_each_entry(pol, entry, chain, bydst) { + if (xfrm_policy_match(pol, fl, type, family, dir) && + pol->priority < priority) { + ret = pol; + break; } } + if (ret) + xfrm_pol_hold(ret); read_unlock_bh(&xfrm_policy_lock); return ret; |