![Pablo Neira Ayuso](/assets/img/avatar_default.png)
Fix lookup of existing match/target structures in the corresponding list
by skipping the family check if NFPROTO_UNSPEC is used.
This is resulting in the allocation and insertion of one match/target
structure for each use of them. So this not only bloats memory
consumption but also severely affects the time to reload the ruleset
from the iptables-compat utility.
After this patch, iptables-compat-restore and iptables-compat take
almost the same time to reload large rulesets.
Fixes: 0ca743a559
("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
829 lines
20 KiB
C
829 lines
20 KiB
C
/*
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* (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This software has been sponsored by Sophos Astaro <http://www.sophos.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <linux/netfilter/nf_tables_compat.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_arp/arp_tables.h>
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#include <net/netfilter/nf_tables.h>
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static int nft_compat_chain_validate_dependency(const char *tablename,
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const struct nft_chain *chain)
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{
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const struct nft_base_chain *basechain;
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if (!tablename || !(chain->flags & NFT_BASE_CHAIN))
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return 0;
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basechain = nft_base_chain(chain);
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if (strcmp(tablename, "nat") == 0 &&
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basechain->type->type != NFT_CHAIN_T_NAT)
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return -EINVAL;
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return 0;
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}
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union nft_entry {
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struct ipt_entry e4;
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struct ip6t_entry e6;
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struct ebt_entry ebt;
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struct arpt_entry arp;
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};
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static inline void
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nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
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{
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par->target = xt;
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par->targinfo = xt_info;
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par->hotdrop = false;
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}
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static void nft_target_eval_xt(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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void *info = nft_expr_priv(expr);
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struct xt_target *target = expr->ops->data;
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struct sk_buff *skb = pkt->skb;
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int ret;
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nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
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ret = target->target(skb, &pkt->xt);
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if (pkt->xt.hotdrop)
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ret = NF_DROP;
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switch (ret) {
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case XT_CONTINUE:
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regs->verdict.code = NFT_CONTINUE;
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break;
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default:
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regs->verdict.code = ret;
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break;
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}
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}
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static void nft_target_eval_bridge(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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void *info = nft_expr_priv(expr);
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struct xt_target *target = expr->ops->data;
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struct sk_buff *skb = pkt->skb;
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int ret;
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nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
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ret = target->target(skb, &pkt->xt);
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if (pkt->xt.hotdrop)
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ret = NF_DROP;
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switch (ret) {
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case EBT_ACCEPT:
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regs->verdict.code = NF_ACCEPT;
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break;
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case EBT_DROP:
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regs->verdict.code = NF_DROP;
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break;
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case EBT_CONTINUE:
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regs->verdict.code = NFT_CONTINUE;
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break;
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case EBT_RETURN:
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regs->verdict.code = NFT_RETURN;
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break;
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default:
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regs->verdict.code = ret;
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break;
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}
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}
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static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
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[NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
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[NFTA_TARGET_REV] = { .type = NLA_U32 },
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[NFTA_TARGET_INFO] = { .type = NLA_BINARY },
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};
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static void
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nft_target_set_tgchk_param(struct xt_tgchk_param *par,
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const struct nft_ctx *ctx,
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struct xt_target *target, void *info,
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union nft_entry *entry, u16 proto, bool inv)
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{
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par->net = ctx->net;
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par->table = ctx->table->name;
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switch (ctx->afi->family) {
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case AF_INET:
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entry->e4.ip.proto = proto;
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entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
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break;
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case AF_INET6:
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if (proto)
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entry->e6.ipv6.flags |= IP6T_F_PROTO;
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entry->e6.ipv6.proto = proto;
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entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
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break;
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case NFPROTO_BRIDGE:
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entry->ebt.ethproto = (__force __be16)proto;
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entry->ebt.invflags = inv ? EBT_IPROTO : 0;
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break;
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case NFPROTO_ARP:
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break;
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}
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par->entryinfo = entry;
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par->target = target;
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par->targinfo = info;
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if (ctx->chain->flags & NFT_BASE_CHAIN) {
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const struct nft_base_chain *basechain =
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nft_base_chain(ctx->chain);
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const struct nf_hook_ops *ops = &basechain->ops[0];
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par->hook_mask = 1 << ops->hooknum;
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} else {
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par->hook_mask = 0;
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}
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par->family = ctx->afi->family;
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par->nft_compat = true;
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}
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static void target_compat_from_user(struct xt_target *t, void *in, void *out)
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{
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int pad;
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memcpy(out, in, t->targetsize);
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pad = XT_ALIGN(t->targetsize) - t->targetsize;
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if (pad > 0)
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memset(out + t->targetsize, 0, pad);
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}
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static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
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[NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
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[NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
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};
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static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
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{
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struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
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u32 flags;
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int err;
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err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
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nft_rule_compat_policy);
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if (err < 0)
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return err;
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if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
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return -EINVAL;
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flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
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if (flags & ~NFT_RULE_COMPAT_F_MASK)
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return -EINVAL;
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if (flags & NFT_RULE_COMPAT_F_INV)
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*inv = true;
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*proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
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return 0;
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}
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static int
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nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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void *info = nft_expr_priv(expr);
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struct xt_target *target = expr->ops->data;
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struct xt_tgchk_param par;
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size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
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u16 proto = 0;
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bool inv = false;
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union nft_entry e = {};
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int ret;
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ret = nft_compat_chain_validate_dependency(target->table, ctx->chain);
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if (ret < 0)
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goto err;
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target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
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if (ctx->nla[NFTA_RULE_COMPAT]) {
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ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
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if (ret < 0)
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goto err;
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}
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nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
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ret = xt_check_target(&par, size, proto, inv);
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if (ret < 0)
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goto err;
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/* The standard target cannot be used */
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if (target->target == NULL) {
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ret = -EINVAL;
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goto err;
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}
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return 0;
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err:
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module_put(target->me);
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return ret;
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}
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static void
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nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
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{
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struct xt_target *target = expr->ops->data;
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void *info = nft_expr_priv(expr);
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struct xt_tgdtor_param par;
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par.net = ctx->net;
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par.target = target;
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par.targinfo = info;
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par.family = ctx->afi->family;
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if (par.target->destroy != NULL)
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par.target->destroy(&par);
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module_put(target->me);
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}
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static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct xt_target *target = expr->ops->data;
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void *info = nft_expr_priv(expr);
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if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
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nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
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nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static int nft_target_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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struct xt_target *target = expr->ops->data;
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unsigned int hook_mask = 0;
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int ret;
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if (ctx->chain->flags & NFT_BASE_CHAIN) {
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const struct nft_base_chain *basechain =
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nft_base_chain(ctx->chain);
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const struct nf_hook_ops *ops = &basechain->ops[0];
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hook_mask = 1 << ops->hooknum;
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if (!(hook_mask & target->hooks))
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return -EINVAL;
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ret = nft_compat_chain_validate_dependency(target->table,
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ctx->chain);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static void nft_match_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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void *info = nft_expr_priv(expr);
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struct xt_match *match = expr->ops->data;
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struct sk_buff *skb = pkt->skb;
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bool ret;
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nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
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ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
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if (pkt->xt.hotdrop) {
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regs->verdict.code = NF_DROP;
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return;
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}
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switch (ret ? 1 : 0) {
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case 1:
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regs->verdict.code = NFT_CONTINUE;
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break;
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case 0:
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regs->verdict.code = NFT_BREAK;
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break;
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}
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}
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static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
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[NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
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[NFTA_MATCH_REV] = { .type = NLA_U32 },
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[NFTA_MATCH_INFO] = { .type = NLA_BINARY },
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};
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/* struct xt_mtchk_param and xt_tgchk_param look very similar */
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static void
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nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
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struct xt_match *match, void *info,
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union nft_entry *entry, u16 proto, bool inv)
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{
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par->net = ctx->net;
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par->table = ctx->table->name;
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switch (ctx->afi->family) {
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case AF_INET:
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entry->e4.ip.proto = proto;
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entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
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break;
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case AF_INET6:
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if (proto)
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entry->e6.ipv6.flags |= IP6T_F_PROTO;
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entry->e6.ipv6.proto = proto;
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entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
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break;
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case NFPROTO_BRIDGE:
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entry->ebt.ethproto = (__force __be16)proto;
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entry->ebt.invflags = inv ? EBT_IPROTO : 0;
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break;
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case NFPROTO_ARP:
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break;
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}
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par->entryinfo = entry;
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par->match = match;
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par->matchinfo = info;
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if (ctx->chain->flags & NFT_BASE_CHAIN) {
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const struct nft_base_chain *basechain =
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nft_base_chain(ctx->chain);
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const struct nf_hook_ops *ops = &basechain->ops[0];
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par->hook_mask = 1 << ops->hooknum;
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} else {
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par->hook_mask = 0;
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}
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par->family = ctx->afi->family;
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par->nft_compat = true;
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}
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static void match_compat_from_user(struct xt_match *m, void *in, void *out)
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{
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int pad;
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memcpy(out, in, m->matchsize);
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pad = XT_ALIGN(m->matchsize) - m->matchsize;
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if (pad > 0)
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memset(out + m->matchsize, 0, pad);
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}
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static int
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nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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void *info = nft_expr_priv(expr);
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struct xt_match *match = expr->ops->data;
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struct xt_mtchk_param par;
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size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
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u16 proto = 0;
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bool inv = false;
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union nft_entry e = {};
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int ret;
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ret = nft_compat_chain_validate_dependency(match->table, ctx->chain);
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if (ret < 0)
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goto err;
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match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
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if (ctx->nla[NFTA_RULE_COMPAT]) {
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ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
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if (ret < 0)
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goto err;
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}
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nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
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ret = xt_check_match(&par, size, proto, inv);
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if (ret < 0)
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goto err;
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return 0;
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err:
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module_put(match->me);
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return ret;
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}
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|
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static void
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nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
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{
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struct xt_match *match = expr->ops->data;
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void *info = nft_expr_priv(expr);
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struct xt_mtdtor_param par;
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|
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par.net = ctx->net;
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par.match = match;
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par.matchinfo = info;
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par.family = ctx->afi->family;
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if (par.match->destroy != NULL)
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par.match->destroy(&par);
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|
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module_put(match->me);
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}
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|
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static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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void *info = nft_expr_priv(expr);
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struct xt_match *match = expr->ops->data;
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if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
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nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
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nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info))
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goto nla_put_failure;
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|
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return 0;
|
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|
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nla_put_failure:
|
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return -1;
|
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}
|
|
|
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static int nft_match_validate(const struct nft_ctx *ctx,
|
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const struct nft_expr *expr,
|
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const struct nft_data **data)
|
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{
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struct xt_match *match = expr->ops->data;
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unsigned int hook_mask = 0;
|
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int ret;
|
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|
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if (ctx->chain->flags & NFT_BASE_CHAIN) {
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const struct nft_base_chain *basechain =
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nft_base_chain(ctx->chain);
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const struct nf_hook_ops *ops = &basechain->ops[0];
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|
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hook_mask = 1 << ops->hooknum;
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if (!(hook_mask & match->hooks))
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return -EINVAL;
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|
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ret = nft_compat_chain_validate_dependency(match->table,
|
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ctx->chain);
|
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if (ret < 0)
|
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return ret;
|
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}
|
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return 0;
|
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}
|
|
|
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static int
|
|
nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
|
int event, u16 family, const char *name,
|
|
int rev, int target)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0;
|
|
|
|
event |= NFNL_SUBSYS_NFT_COMPAT << 8;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = family;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
|
|
nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
|
|
nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh, const struct nlattr * const tb[])
|
|
{
|
|
int ret = 0, target;
|
|
struct nfgenmsg *nfmsg;
|
|
const char *fmt;
|
|
const char *name;
|
|
u32 rev;
|
|
struct sk_buff *skb2;
|
|
|
|
if (tb[NFTA_COMPAT_NAME] == NULL ||
|
|
tb[NFTA_COMPAT_REV] == NULL ||
|
|
tb[NFTA_COMPAT_TYPE] == NULL)
|
|
return -EINVAL;
|
|
|
|
name = nla_data(tb[NFTA_COMPAT_NAME]);
|
|
rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
|
|
target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
|
|
switch(nfmsg->nfgen_family) {
|
|
case AF_INET:
|
|
fmt = "ipt_%s";
|
|
break;
|
|
case AF_INET6:
|
|
fmt = "ip6t_%s";
|
|
break;
|
|
case NFPROTO_BRIDGE:
|
|
fmt = "ebt_%s";
|
|
break;
|
|
case NFPROTO_ARP:
|
|
fmt = "arpt_%s";
|
|
break;
|
|
default:
|
|
pr_err("nft_compat: unsupported protocol %d\n",
|
|
nfmsg->nfgen_family);
|
|
return -EINVAL;
|
|
}
|
|
|
|
try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
|
|
rev, target, &ret),
|
|
fmt, name);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* include the best revision for this extension in the message */
|
|
if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq,
|
|
NFNL_MSG_TYPE(nlh->nlmsg_type),
|
|
NFNL_MSG_COMPAT_GET,
|
|
nfmsg->nfgen_family,
|
|
name, ret, target) <= 0) {
|
|
kfree_skb(skb2);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
|
|
MSG_DONTWAIT);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
|
|
return ret == -EAGAIN ? -ENOBUFS : ret;
|
|
}
|
|
|
|
static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
|
|
[NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
|
|
.len = NFT_COMPAT_NAME_MAX-1 },
|
|
[NFTA_COMPAT_REV] = { .type = NLA_U32 },
|
|
[NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
|
|
[NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get,
|
|
.attr_count = NFTA_COMPAT_MAX,
|
|
.policy = nfnl_compat_policy_get },
|
|
};
|
|
|
|
static const struct nfnetlink_subsystem nfnl_compat_subsys = {
|
|
.name = "nft-compat",
|
|
.subsys_id = NFNL_SUBSYS_NFT_COMPAT,
|
|
.cb_count = NFNL_MSG_COMPAT_MAX,
|
|
.cb = nfnl_nft_compat_cb,
|
|
};
|
|
|
|
static LIST_HEAD(nft_match_list);
|
|
|
|
struct nft_xt {
|
|
struct list_head head;
|
|
struct nft_expr_ops ops;
|
|
};
|
|
|
|
static struct nft_expr_type nft_match_type;
|
|
|
|
static bool nft_match_cmp(const struct xt_match *match,
|
|
const char *name, u32 rev, u32 family)
|
|
{
|
|
return strcmp(match->name, name) == 0 && match->revision == rev &&
|
|
(match->family == NFPROTO_UNSPEC || match->family == family);
|
|
}
|
|
|
|
static const struct nft_expr_ops *
|
|
nft_match_select_ops(const struct nft_ctx *ctx,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_xt *nft_match;
|
|
struct xt_match *match;
|
|
char *mt_name;
|
|
u32 rev, family;
|
|
|
|
if (tb[NFTA_MATCH_NAME] == NULL ||
|
|
tb[NFTA_MATCH_REV] == NULL ||
|
|
tb[NFTA_MATCH_INFO] == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
mt_name = nla_data(tb[NFTA_MATCH_NAME]);
|
|
rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
|
|
family = ctx->afi->family;
|
|
|
|
/* Re-use the existing match if it's already loaded. */
|
|
list_for_each_entry(nft_match, &nft_match_list, head) {
|
|
struct xt_match *match = nft_match->ops.data;
|
|
|
|
if (nft_match_cmp(match, mt_name, rev, family)) {
|
|
if (!try_module_get(match->me))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
return &nft_match->ops;
|
|
}
|
|
}
|
|
|
|
match = xt_request_find_match(family, mt_name, rev);
|
|
if (IS_ERR(match))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
/* This is the first time we use this match, allocate operations */
|
|
nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
|
|
if (nft_match == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
nft_match->ops.type = &nft_match_type;
|
|
nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
|
|
nft_match->ops.eval = nft_match_eval;
|
|
nft_match->ops.init = nft_match_init;
|
|
nft_match->ops.destroy = nft_match_destroy;
|
|
nft_match->ops.dump = nft_match_dump;
|
|
nft_match->ops.validate = nft_match_validate;
|
|
nft_match->ops.data = match;
|
|
|
|
list_add(&nft_match->head, &nft_match_list);
|
|
|
|
return &nft_match->ops;
|
|
}
|
|
|
|
static void nft_match_release(void)
|
|
{
|
|
struct nft_xt *nft_match, *tmp;
|
|
|
|
list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head)
|
|
kfree(nft_match);
|
|
}
|
|
|
|
static struct nft_expr_type nft_match_type __read_mostly = {
|
|
.name = "match",
|
|
.select_ops = nft_match_select_ops,
|
|
.policy = nft_match_policy,
|
|
.maxattr = NFTA_MATCH_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static LIST_HEAD(nft_target_list);
|
|
|
|
static struct nft_expr_type nft_target_type;
|
|
|
|
static bool nft_target_cmp(const struct xt_target *tg,
|
|
const char *name, u32 rev, u32 family)
|
|
{
|
|
return strcmp(tg->name, name) == 0 && tg->revision == rev &&
|
|
(tg->family == NFPROTO_UNSPEC || tg->family == family);
|
|
}
|
|
|
|
static const struct nft_expr_ops *
|
|
nft_target_select_ops(const struct nft_ctx *ctx,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_xt *nft_target;
|
|
struct xt_target *target;
|
|
char *tg_name;
|
|
u32 rev, family;
|
|
|
|
if (tb[NFTA_TARGET_NAME] == NULL ||
|
|
tb[NFTA_TARGET_REV] == NULL ||
|
|
tb[NFTA_TARGET_INFO] == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
tg_name = nla_data(tb[NFTA_TARGET_NAME]);
|
|
rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
|
|
family = ctx->afi->family;
|
|
|
|
/* Re-use the existing target if it's already loaded. */
|
|
list_for_each_entry(nft_target, &nft_target_list, head) {
|
|
struct xt_target *target = nft_target->ops.data;
|
|
|
|
if (nft_target_cmp(target, tg_name, rev, family)) {
|
|
if (!try_module_get(target->me))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
return &nft_target->ops;
|
|
}
|
|
}
|
|
|
|
target = xt_request_find_target(family, tg_name, rev);
|
|
if (IS_ERR(target))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
/* This is the first time we use this target, allocate operations */
|
|
nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
|
|
if (nft_target == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
nft_target->ops.type = &nft_target_type;
|
|
nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
|
|
nft_target->ops.init = nft_target_init;
|
|
nft_target->ops.destroy = nft_target_destroy;
|
|
nft_target->ops.dump = nft_target_dump;
|
|
nft_target->ops.validate = nft_target_validate;
|
|
nft_target->ops.data = target;
|
|
|
|
if (family == NFPROTO_BRIDGE)
|
|
nft_target->ops.eval = nft_target_eval_bridge;
|
|
else
|
|
nft_target->ops.eval = nft_target_eval_xt;
|
|
|
|
list_add(&nft_target->head, &nft_target_list);
|
|
|
|
return &nft_target->ops;
|
|
}
|
|
|
|
static void nft_target_release(void)
|
|
{
|
|
struct nft_xt *nft_target, *tmp;
|
|
|
|
list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head)
|
|
kfree(nft_target);
|
|
}
|
|
|
|
static struct nft_expr_type nft_target_type __read_mostly = {
|
|
.name = "target",
|
|
.select_ops = nft_target_select_ops,
|
|
.policy = nft_target_policy,
|
|
.maxattr = NFTA_TARGET_MAX,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init nft_compat_module_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = nft_register_expr(&nft_match_type);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = nft_register_expr(&nft_target_type);
|
|
if (ret < 0)
|
|
goto err_match;
|
|
|
|
ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
|
|
if (ret < 0) {
|
|
pr_err("nft_compat: cannot register with nfnetlink.\n");
|
|
goto err_target;
|
|
}
|
|
|
|
pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n");
|
|
|
|
return ret;
|
|
|
|
err_target:
|
|
nft_unregister_expr(&nft_target_type);
|
|
err_match:
|
|
nft_unregister_expr(&nft_match_type);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nft_compat_module_exit(void)
|
|
{
|
|
nfnetlink_subsys_unregister(&nfnl_compat_subsys);
|
|
nft_unregister_expr(&nft_target_type);
|
|
nft_unregister_expr(&nft_match_type);
|
|
nft_match_release();
|
|
nft_target_release();
|
|
}
|
|
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
|
|
|
|
module_init(nft_compat_module_init);
|
|
module_exit(nft_compat_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
|
MODULE_ALIAS_NFT_EXPR("match");
|
|
MODULE_ALIAS_NFT_EXPR("target");
|