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authorJan Engelhardt <jengelh@medozas.de>2010-02-24 18:35:37 +0100
committerPatrick McHardy <kaber@trash.net>2010-02-24 18:35:37 +0100
commit6bdb331bc6910d1ccb74dc9852fc858c5916c927 (patch)
treed77dd2df2d6d43ce25703ce8c9ecab0173c14a7f /net/ipv4/netfilter/ip_tables.c
parentdcea992aca82cb08b4674c4c783e325835408d1e (diff)
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netfilter: xtables: optimize call flow around xt_ematch_foreach
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4/netfilter/ip_tables.c')
-rw-r--r--net/ipv4/netfilter/ip_tables.c93
1 files changed, 31 insertions, 62 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 3a7fc732b91..36edc7d5f28 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -572,14 +572,10 @@ mark_source_chains(const struct xt_table_info *newinfo,
return 1;
}
-static int
-cleanup_match(struct ipt_entry_match *m, struct net *net, unsigned int *i)
+static void cleanup_match(struct ipt_entry_match *m, struct net *net)
{
struct xt_mtdtor_param par;
- if (i && (*i)-- == 0)
- return 1;
-
par.net = net;
par.match = m->u.kernel.match;
par.matchinfo = m->data;
@@ -587,7 +583,6 @@ cleanup_match(struct ipt_entry_match *m, struct net *net, unsigned int *i)
if (par.match->destroy != NULL)
par.match->destroy(&par);
module_put(par.match->me);
- return 0;
}
static int
@@ -612,8 +607,7 @@ check_entry(const struct ipt_entry *e, const char *name)
}
static int
-check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par,
- unsigned int *i)
+check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par)
{
const struct ipt_ip *ip = par->entryinfo;
int ret;
@@ -628,13 +622,11 @@ check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par,
par.match->name);
return ret;
}
- ++*i;
return 0;
}
static int
-find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par,
- unsigned int *i)
+find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par)
{
struct xt_match *match;
int ret;
@@ -648,7 +640,7 @@ find_check_match(struct ipt_entry_match *m, struct xt_mtchk_param *par,
}
m->u.kernel.match = match;
- ret = check_match(m, par, i);
+ ret = check_match(m, par);
if (ret)
goto err;
@@ -704,12 +696,11 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
mtpar.hook_mask = e->comefrom;
mtpar.family = NFPROTO_IPV4;
xt_ematch_foreach(ematch, e) {
- ret = find_check_match(ematch, &mtpar, &j);
+ ret = find_check_match(ematch, &mtpar);
if (ret != 0)
- break;
+ goto cleanup_matches;
+ ++j;
}
- if (ret != 0)
- goto cleanup_matches;
t = ipt_get_target(e);
target = try_then_request_module(xt_find_target(AF_INET,
@@ -730,9 +721,11 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
err:
module_put(t->u.kernel.target->me);
cleanup_matches:
- xt_ematch_foreach(ematch, e)
- if (cleanup_match(ematch, net, &j) != 0)
+ xt_ematch_foreach(ematch, e) {
+ if (j-- == 0)
break;
+ cleanup_match(ematch, net);
+ }
return ret;
}
@@ -807,8 +800,7 @@ cleanup_entry(struct ipt_entry *e, struct net *net)
/* Cleanup all matches */
xt_ematch_foreach(ematch, e)
- if (cleanup_match(ematch, net, NULL) != 0)
- break;
+ cleanup_match(ematch, net);
t = ipt_get_target(e);
par.net = net;
@@ -1064,13 +1056,6 @@ static int compat_standard_to_user(void __user *dst, const void *src)
return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
}
-static inline int
-compat_calc_match(const struct ipt_entry_match *m, int *size)
-{
- *size += xt_compat_match_offset(m->u.kernel.match);
- return 0;
-}
-
static int compat_calc_entry(const struct ipt_entry *e,
const struct xt_table_info *info,
const void *base, struct xt_table_info *newinfo)
@@ -1083,8 +1068,7 @@ static int compat_calc_entry(const struct ipt_entry *e,
off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
entry_offset = (void *)e - base;
xt_ematch_foreach(ematch, e)
- if (compat_calc_match(ematch, &off) != 0)
- break;
+ off += xt_compat_match_offset(ematch->u.kernel.match);
t = ipt_get_target_c(e);
off += xt_compat_target_offset(t->u.kernel.target);
newinfo->size -= off;
@@ -1475,11 +1459,9 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
xt_ematch_foreach(ematch, e) {
ret = xt_compat_match_to_user(ematch, dstptr, size);
if (ret != 0)
- break;
+ return ret;
}
target_offset = e->target_offset - (origsize - *size);
- if (ret)
- return ret;
t = ipt_get_target(e);
ret = xt_compat_target_to_user(t, dstptr, size);
if (ret)
@@ -1496,7 +1478,7 @@ compat_find_calc_match(struct ipt_entry_match *m,
const char *name,
const struct ipt_ip *ip,
unsigned int hookmask,
- int *size, unsigned int *i)
+ int *size)
{
struct xt_match *match;
@@ -1510,18 +1492,6 @@ compat_find_calc_match(struct ipt_entry_match *m,
}
m->u.kernel.match = match;
*size += xt_compat_match_offset(match);
-
- (*i)++;
- return 0;
-}
-
-static int
-compat_release_match(struct ipt_entry_match *m, unsigned int *i)
-{
- if (i && (*i)-- == 0)
- return 1;
-
- module_put(m->u.kernel.match->me);
return 0;
}
@@ -1532,8 +1502,7 @@ static void compat_release_entry(struct compat_ipt_entry *e)
/* Cleanup all matches */
xt_ematch_foreach(ematch, e)
- if (compat_release_match(ematch, NULL) != 0)
- break;
+ module_put(ematch->u.kernel.match->me);
t = compat_ipt_get_target(e);
module_put(t->u.kernel.target->me);
}
@@ -1579,12 +1548,11 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
j = 0;
xt_ematch_foreach(ematch, e) {
ret = compat_find_calc_match(ematch, name,
- &e->ip, e->comefrom, &off, &j);
+ &e->ip, e->comefrom, &off);
if (ret != 0)
- break;
+ goto release_matches;
+ ++j;
}
- if (ret != 0)
- goto release_matches;
t = compat_ipt_get_target(e);
target = try_then_request_module(xt_find_target(AF_INET,
@@ -1621,9 +1589,11 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
out:
module_put(t->u.kernel.target->me);
release_matches:
- xt_ematch_foreach(ematch, e)
- if (compat_release_match(ematch, &j) != 0)
+ xt_ematch_foreach(ematch, e) {
+ if (j-- == 0)
break;
+ module_put(ematch->u.kernel.match->me);
+ }
return ret;
}
@@ -1651,10 +1621,8 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
xt_ematch_foreach(ematch, e) {
ret = xt_compat_match_from_user(ematch, dstptr, size);
if (ret != 0)
- break;
+ return ret;
}
- if (ret)
- return ret;
de->target_offset = e->target_offset - (origsize - *size);
t = compat_ipt_get_target(e);
target = t->u.kernel.target;
@@ -1685,12 +1653,11 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
mtpar.hook_mask = e->comefrom;
mtpar.family = NFPROTO_IPV4;
xt_ematch_foreach(ematch, e) {
- ret = check_match(ematch, &mtpar, &j);
+ ret = check_match(ematch, &mtpar);
if (ret != 0)
- break;
+ goto cleanup_matches;
+ ++j;
}
- if (ret)
- goto cleanup_matches;
ret = check_target(e, net, name);
if (ret)
@@ -1698,9 +1665,11 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
return 0;
cleanup_matches:
- xt_ematch_foreach(ematch, e)
- if (cleanup_match(ematch, net, &j) != 0)
+ xt_ematch_foreach(ematch, e) {
+ if (j-- == 0)
break;
+ cleanup_match(ematch, net);
+ }
return ret;
}