From 329a0807124f12fe1c8032f95d8a8eb47047fb0e Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 1 Apr 2016 14:17:31 +0200 Subject: [PATCH] netfilter: ip6_tables: simplify translate_compat_table args Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/ipv6/netfilter/ip6_tables.c | 59 ++++++++++++++------------------- 1 file changed, 24 insertions(+), 35 deletions(-) diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index 6957627c7931..8d082c557771 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -1461,7 +1461,6 @@ compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr, static int compat_find_calc_match(struct xt_entry_match *m, - const char *name, const struct ip6t_ip6 *ipv6, int *size) { @@ -1498,8 +1497,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, const unsigned char *base, const unsigned char *limit, const unsigned int *hook_entries, - const unsigned int *underflows, - const char *name) + const unsigned int *underflows) { struct xt_entry_match *ematch; struct xt_entry_target *t; @@ -1535,7 +1533,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e, entry_offset = (void *)e - (void *)base; j = 0; xt_ematch_foreach(ematch, e) { - ret = compat_find_calc_match(ematch, name, &e->ipv6, &off); + ret = compat_find_calc_match(ematch, &e->ipv6, &off); if (ret != 0) goto release_matches; ++j; @@ -1584,7 +1582,7 @@ release_matches: static int compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, - unsigned int *size, const char *name, + unsigned int *size, struct xt_table_info *newinfo, unsigned char *base) { struct xt_entry_target *t; @@ -1664,14 +1662,9 @@ static int compat_check_entry(struct ip6t_entry *e, struct net *net, static int translate_compat_table(struct net *net, - const char *name, - unsigned int valid_hooks, struct xt_table_info **pinfo, void **pentry0, - unsigned int total_size, - unsigned int number, - unsigned int *hook_entries, - unsigned int *underflows) + const struct compat_ip6t_replace *compatr) { unsigned int i, j; struct xt_table_info *newinfo, *info; @@ -1683,8 +1676,8 @@ translate_compat_table(struct net *net, info = *pinfo; entry0 = *pentry0; - size = total_size; - info->number = number; + size = compatr->size; + info->number = compatr->num_entries; /* Init all hooks to impossible value. */ for (i = 0; i < NF_INET_NUMHOOKS; i++) { @@ -1695,40 +1688,39 @@ translate_compat_table(struct net *net, duprintf("translate_compat_table: size %u\n", info->size); j = 0; xt_compat_lock(AF_INET6); - xt_compat_init_offsets(AF_INET6, number); + xt_compat_init_offsets(AF_INET6, compatr->num_entries); /* Walk through entries, checking offsets. */ - xt_entry_foreach(iter0, entry0, total_size) { + xt_entry_foreach(iter0, entry0, compatr->size) { ret = check_compat_entry_size_and_hooks(iter0, info, &size, entry0, - entry0 + total_size, - hook_entries, - underflows, - name); + entry0 + compatr->size, + compatr->hook_entry, + compatr->underflow); if (ret != 0) goto out_unlock; ++j; } ret = -EINVAL; - if (j != number) { + if (j != compatr->num_entries) { duprintf("translate_compat_table: %u not %u entries\n", - j, number); + j, compatr->num_entries); goto out_unlock; } /* Check hooks all assigned */ for (i = 0; i < NF_INET_NUMHOOKS; i++) { /* Only hooks which are valid */ - if (!(valid_hooks & (1 << i))) + if (!(compatr->valid_hooks & (1 << i))) continue; if (info->hook_entry[i] == 0xFFFFFFFF) { duprintf("Invalid hook entry %u %u\n", - i, hook_entries[i]); + i, info->hook_entry[i]); goto out_unlock; } if (info->underflow[i] == 0xFFFFFFFF) { duprintf("Invalid underflow %u %u\n", - i, underflows[i]); + i, info->underflow[i]); goto out_unlock; } } @@ -1738,17 +1730,17 @@ translate_compat_table(struct net *net, if (!newinfo) goto out_unlock; - newinfo->number = number; + newinfo->number = compatr->num_entries; for (i = 0; i < NF_INET_NUMHOOKS; i++) { newinfo->hook_entry[i] = info->hook_entry[i]; newinfo->underflow[i] = info->underflow[i]; } entry1 = newinfo->entries; pos = entry1; - size = total_size; - xt_entry_foreach(iter0, entry0, total_size) { + size = compatr->size; + xt_entry_foreach(iter0, entry0, compatr->size) { ret = compat_copy_entry_from_user(iter0, &pos, &size, - name, newinfo, entry1); + newinfo, entry1); if (ret != 0) break; } @@ -1758,12 +1750,12 @@ translate_compat_table(struct net *net, goto free_newinfo; ret = -ELOOP; - if (!mark_source_chains(newinfo, valid_hooks, entry1)) + if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1)) goto free_newinfo; i = 0; xt_entry_foreach(iter1, entry1, newinfo->size) { - ret = compat_check_entry(iter1, net, name); + ret = compat_check_entry(iter1, net, compatr->name); if (ret != 0) break; ++i; @@ -1803,7 +1795,7 @@ translate_compat_table(struct net *net, free_newinfo: xt_free_table_info(newinfo); out: - xt_entry_foreach(iter0, entry0, total_size) { + xt_entry_foreach(iter0, entry0, compatr->size) { if (j-- == 0) break; compat_release_entry(iter0); @@ -1848,10 +1840,7 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len) goto free_newinfo; } - ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, - &newinfo, &loc_cpu_entry, tmp.size, - tmp.num_entries, tmp.hook_entry, - tmp.underflow); + ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); if (ret != 0) goto free_newinfo; -- 2.39.2