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>
This commit is contained in:
Jan Engelhardt
parent
dcea992aca
commit
6bdb331bc6
|
|
@ -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;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -603,14 +603,10 @@ mark_source_chains(const struct xt_table_info *newinfo,
|
|||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
cleanup_match(struct ip6t_entry_match *m, struct net *net, unsigned int *i)
|
||||
static void cleanup_match(struct ip6t_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;
|
||||
|
|
@ -618,7 +614,6 @@ cleanup_match(struct ip6t_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
|
||||
|
|
@ -642,8 +637,7 @@ check_entry(const struct ip6t_entry *e, const char *name)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
|
||||
unsigned int *i)
|
||||
static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
|
||||
{
|
||||
const struct ip6t_ip6 *ipv6 = par->entryinfo;
|
||||
int ret;
|
||||
|
|
@ -658,13 +652,11 @@ static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
|
|||
par.match->name);
|
||||
return ret;
|
||||
}
|
||||
++*i;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
|
||||
unsigned int *i)
|
||||
find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
|
||||
{
|
||||
struct xt_match *match;
|
||||
int ret;
|
||||
|
|
@ -678,7 +670,7 @@ find_check_match(struct ip6t_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;
|
||||
|
||||
|
|
@ -735,12 +727,11 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
|
|||
mtpar.hook_mask = e->comefrom;
|
||||
mtpar.family = NFPROTO_IPV6;
|
||||
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 = ip6t_get_target(e);
|
||||
target = try_then_request_module(xt_find_target(AF_INET6,
|
||||
|
|
@ -761,9 +752,11 @@ find_check_entry(struct ip6t_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;
|
||||
}
|
||||
|
||||
|
|
@ -837,8 +830,7 @@ static void cleanup_entry(struct ip6t_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 = ip6t_get_target(e);
|
||||
|
||||
par.net = net;
|
||||
|
|
@ -1094,13 +1086,6 @@ 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 ip6t_entry_match *m, int *size)
|
||||
{
|
||||
*size += xt_compat_match_offset(m->u.kernel.match);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int compat_calc_entry(const struct ip6t_entry *e,
|
||||
const struct xt_table_info *info,
|
||||
const void *base, struct xt_table_info *newinfo)
|
||||
|
|
@ -1113,8 +1098,7 @@ static int compat_calc_entry(const struct ip6t_entry *e,
|
|||
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_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 = ip6t_get_target_c(e);
|
||||
off += xt_compat_target_offset(t->u.kernel.target);
|
||||
newinfo->size -= off;
|
||||
|
|
@ -1508,11 +1492,9 @@ compat_copy_entry_to_user(struct ip6t_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 = ip6t_get_target(e);
|
||||
ret = xt_compat_target_to_user(t, dstptr, size);
|
||||
if (ret)
|
||||
|
|
@ -1529,7 +1511,7 @@ compat_find_calc_match(struct ip6t_entry_match *m,
|
|||
const char *name,
|
||||
const struct ip6t_ip6 *ipv6,
|
||||
unsigned int hookmask,
|
||||
int *size, unsigned int *i)
|
||||
int *size)
|
||||
{
|
||||
struct xt_match *match;
|
||||
|
||||
|
|
@ -1543,18 +1525,6 @@ compat_find_calc_match(struct ip6t_entry_match *m,
|
|||
}
|
||||
m->u.kernel.match = match;
|
||||
*size += xt_compat_match_offset(match);
|
||||
|
||||
(*i)++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
compat_release_match(struct ip6t_entry_match *m, unsigned int *i)
|
||||
{
|
||||
if (i && (*i)-- == 0)
|
||||
return 1;
|
||||
|
||||
module_put(m->u.kernel.match->me);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1565,8 +1535,7 @@ static void compat_release_entry(struct compat_ip6t_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_ip6t_get_target(e);
|
||||
module_put(t->u.kernel.target->me);
|
||||
}
|
||||
|
|
@ -1612,12 +1581,11 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
|
|||
j = 0;
|
||||
xt_ematch_foreach(ematch, e) {
|
||||
ret = compat_find_calc_match(ematch, name,
|
||||
&e->ipv6, e->comefrom, &off, &j);
|
||||
&e->ipv6, e->comefrom, &off);
|
||||
if (ret != 0)
|
||||
break;
|
||||
goto release_matches;
|
||||
++j;
|
||||
}
|
||||
if (ret != 0)
|
||||
goto release_matches;
|
||||
|
||||
t = compat_ip6t_get_target(e);
|
||||
target = try_then_request_module(xt_find_target(AF_INET6,
|
||||
|
|
@ -1654,9 +1622,11 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_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;
|
||||
}
|
||||
|
||||
|
|
@ -1684,10 +1654,8 @@ compat_copy_entry_from_user(struct compat_ip6t_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_ip6t_get_target(e);
|
||||
target = t->u.kernel.target;
|
||||
|
|
@ -1718,12 +1686,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
|||
mtpar.hook_mask = e->comefrom;
|
||||
mtpar.family = NFPROTO_IPV6;
|
||||
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)
|
||||
|
|
@ -1731,9 +1698,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
|
|||
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;
|
||||
}
|
||||
|
||||
|
|
|
|||
Reference in New Issue