mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
synced 2026-10-28 18:51:56 -04:00
netfilter: xtables: optimize call flow around xt_ematch_foreach
Signed-off-by: Jan Engelhardt <[email protected]> Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Jan Engelhardt
Patrick McHardy
parent
dcea992aca
commit
6bdb331bc6
2 changed files with 62 additions and 124 deletions
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@ -603,14 +603,10 @@ mark_source_chains(const struct xt_table_info *newinfo,
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return 1;
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}
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static int
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cleanup_match(struct ip6t_entry_match *m, struct net *net, unsigned int *i)
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static void cleanup_match(struct ip6t_entry_match *m, struct net *net)
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{
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struct xt_mtdtor_param par;
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if (i && (*i)-- == 0)
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return 1;
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par.net = net;
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par.match = m->u.kernel.match;
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par.matchinfo = m->data;
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@ -618,7 +614,6 @@ cleanup_match(struct ip6t_entry_match *m, struct net *net, unsigned int *i)
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if (par.match->destroy != NULL)
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par.match->destroy(&par);
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module_put(par.match->me);
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return 0;
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}
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static int
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@ -642,8 +637,7 @@ check_entry(const struct ip6t_entry *e, const char *name)
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return 0;
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}
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static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
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unsigned int *i)
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static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
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{
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const struct ip6t_ip6 *ipv6 = par->entryinfo;
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int ret;
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@ -658,13 +652,11 @@ static int check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
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par.match->name);
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return ret;
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}
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++*i;
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return 0;
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}
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static int
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find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
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unsigned int *i)
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find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par)
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{
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struct xt_match *match;
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int ret;
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@ -678,7 +670,7 @@ find_check_match(struct ip6t_entry_match *m, struct xt_mtchk_param *par,
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}
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m->u.kernel.match = match;
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ret = check_match(m, par, i);
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ret = check_match(m, par);
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if (ret)
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goto err;
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@ -735,12 +727,11 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
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mtpar.hook_mask = e->comefrom;
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mtpar.family = NFPROTO_IPV6;
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xt_ematch_foreach(ematch, e) {
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ret = find_check_match(ematch, &mtpar, &j);
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ret = find_check_match(ematch, &mtpar);
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if (ret != 0)
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break;
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goto cleanup_matches;
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++j;
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}
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if (ret != 0)
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goto cleanup_matches;
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t = ip6t_get_target(e);
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target = try_then_request_module(xt_find_target(AF_INET6,
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@ -761,9 +752,11 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
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err:
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module_put(t->u.kernel.target->me);
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cleanup_matches:
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, &j) != 0)
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xt_ematch_foreach(ematch, e) {
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if (j-- == 0)
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break;
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cleanup_match(ematch, net);
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}
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return ret;
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}
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@ -837,8 +830,7 @@ static void cleanup_entry(struct ip6t_entry *e, struct net *net)
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/* Cleanup all matches */
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, NULL) != 0)
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break;
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cleanup_match(ematch, net);
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t = ip6t_get_target(e);
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par.net = net;
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@ -1094,13 +1086,6 @@ static int compat_standard_to_user(void __user *dst, const void *src)
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return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
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}
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static inline int
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compat_calc_match(const struct ip6t_entry_match *m, int *size)
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{
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*size += xt_compat_match_offset(m->u.kernel.match);
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return 0;
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}
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static int compat_calc_entry(const struct ip6t_entry *e,
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const struct xt_table_info *info,
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const void *base, struct xt_table_info *newinfo)
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@ -1113,8 +1098,7 @@ static int compat_calc_entry(const struct ip6t_entry *e,
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off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
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entry_offset = (void *)e - base;
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xt_ematch_foreach(ematch, e)
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if (compat_calc_match(ematch, &off) != 0)
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break;
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off += xt_compat_match_offset(ematch->u.kernel.match);
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t = ip6t_get_target_c(e);
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off += xt_compat_target_offset(t->u.kernel.target);
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newinfo->size -= off;
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@ -1508,11 +1492,9 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
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xt_ematch_foreach(ematch, e) {
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ret = xt_compat_match_to_user(ematch, dstptr, size);
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if (ret != 0)
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break;
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return ret;
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}
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target_offset = e->target_offset - (origsize - *size);
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if (ret)
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return ret;
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t = ip6t_get_target(e);
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ret = xt_compat_target_to_user(t, dstptr, size);
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if (ret)
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@ -1529,7 +1511,7 @@ compat_find_calc_match(struct ip6t_entry_match *m,
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const char *name,
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const struct ip6t_ip6 *ipv6,
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unsigned int hookmask,
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int *size, unsigned int *i)
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int *size)
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{
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struct xt_match *match;
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@ -1543,18 +1525,6 @@ compat_find_calc_match(struct ip6t_entry_match *m,
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}
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m->u.kernel.match = match;
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*size += xt_compat_match_offset(match);
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(*i)++;
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return 0;
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}
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static int
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compat_release_match(struct ip6t_entry_match *m, unsigned int *i)
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{
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if (i && (*i)-- == 0)
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return 1;
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module_put(m->u.kernel.match->me);
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return 0;
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}
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@ -1565,8 +1535,7 @@ static void compat_release_entry(struct compat_ip6t_entry *e)
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/* Cleanup all matches */
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xt_ematch_foreach(ematch, e)
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if (compat_release_match(ematch, NULL) != 0)
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break;
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module_put(ematch->u.kernel.match->me);
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t = compat_ip6t_get_target(e);
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module_put(t->u.kernel.target->me);
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}
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@ -1612,12 +1581,11 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
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j = 0;
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xt_ematch_foreach(ematch, e) {
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ret = compat_find_calc_match(ematch, name,
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&e->ipv6, e->comefrom, &off, &j);
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&e->ipv6, e->comefrom, &off);
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if (ret != 0)
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break;
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goto release_matches;
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++j;
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}
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if (ret != 0)
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goto release_matches;
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t = compat_ip6t_get_target(e);
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target = try_then_request_module(xt_find_target(AF_INET6,
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@ -1654,9 +1622,11 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
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out:
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module_put(t->u.kernel.target->me);
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release_matches:
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xt_ematch_foreach(ematch, e)
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if (compat_release_match(ematch, &j) != 0)
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xt_ematch_foreach(ematch, e) {
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if (j-- == 0)
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break;
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module_put(ematch->u.kernel.match->me);
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}
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return ret;
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}
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@ -1684,10 +1654,8 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
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xt_ematch_foreach(ematch, e) {
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ret = xt_compat_match_from_user(ematch, dstptr, size);
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if (ret != 0)
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break;
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return ret;
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}
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if (ret)
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return ret;
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de->target_offset = e->target_offset - (origsize - *size);
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t = compat_ip6t_get_target(e);
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target = t->u.kernel.target;
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@ -1718,12 +1686,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
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mtpar.hook_mask = e->comefrom;
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mtpar.family = NFPROTO_IPV6;
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xt_ematch_foreach(ematch, e) {
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ret = check_match(ematch, &mtpar, &j);
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ret = check_match(ematch, &mtpar);
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if (ret != 0)
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break;
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goto cleanup_matches;
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++j;
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}
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if (ret)
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goto cleanup_matches;
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ret = check_target(e, net, name);
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if (ret)
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@ -1731,9 +1698,11 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net,
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return 0;
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cleanup_matches:
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xt_ematch_foreach(ematch, e)
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if (cleanup_match(ematch, net, &j) != 0)
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xt_ematch_foreach(ematch, e) {
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if (j-- == 0)
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break;
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cleanup_match(ematch, net);
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}
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return ret;
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}
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