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| author | Florian Westphal <fw@strlen.de> | 2015-07-14 17:51:06 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-07-15 18:18:04 +0200 |
| commit | 98d1bd802cdbc8f56868fae51edec13e86b59515 (patch) | |
| tree | 6f16cde1d04c7f4b7f91303a886c714fe90a0de1 /net/netfilter/x_tables.c | |
| parent | fd2ecda0341960d0ce361d648cf4dd98187afb06 (diff) | |
| download | linux-98d1bd802cdbc8f56868fae51edec13e86b59515.tar.gz | |
netfilter: xtables: compute exact size needed for jumpstack
The {arp,ip,ip6tables} jump stack is currently sized based
on the number of user chains.
However, its rather unlikely that every user defined chain jumps to the
next, so lets use the existing loop detection logic to also track the
chain depths.
The stacksize is then set to the largest chain depth seen.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/x_tables.c')
| -rw-r--r-- | net/netfilter/x_tables.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index d324fe71260c9..4db7d60d42fae 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -749,6 +749,10 @@ static int xt_jumpstack_alloc(struct xt_table_info *i) if (i->jumpstack == NULL) return -ENOMEM; + /* ruleset without jumps -- no stack needed */ + if (i->stacksize == 0) + return 0; + i->stacksize *= xt_jumpstack_multiplier; size = sizeof(void *) * i->stacksize; for_each_possible_cpu(cpu) { |