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365b5a36f3
Actual implementation stores 0 in the destination register if no socket
is found by the lookup, but that is not intentional as it is not really
a value of any socket metadata.
This patch fixes this and breaks rule evaluation in this case.
Fixes: 554ced0a6e
("netfilter: nf_tables: add support for native socket matching")
Signed-off-by: Máté Eckl <ecklm94@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/module.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_socket.h>
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#include <net/inet_sock.h>
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#include <net/tcp.h>
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struct nft_socket {
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enum nft_socket_keys key:8;
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union {
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enum nft_registers dreg:8;
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};
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};
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static void nft_socket_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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const struct nft_socket *priv = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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struct sock *sk = skb->sk;
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u32 *dest = ®s->data[priv->dreg];
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if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
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sk = NULL;
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if (!sk)
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switch(nft_pf(pkt)) {
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case NFPROTO_IPV4:
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sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, nft_in(pkt));
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break;
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case NFPROTO_IPV6:
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sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, nft_in(pkt));
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break;
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#endif
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default:
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WARN_ON_ONCE(1);
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regs->verdict.code = NFT_BREAK;
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return;
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}
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if (!sk) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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/* So that subsequent socket matching not to require other lookups. */
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skb->sk = sk;
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switch(priv->key) {
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case NFT_SOCKET_TRANSPARENT:
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nft_reg_store8(dest, inet_sk_transparent(sk));
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break;
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default:
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WARN_ON(1);
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regs->verdict.code = NFT_BREAK;
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}
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}
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static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
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[NFTA_SOCKET_KEY] = { .type = NLA_U32 },
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[NFTA_SOCKET_DREG] = { .type = NLA_U32 },
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};
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static int nft_socket_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_socket *priv = nft_expr_priv(expr);
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unsigned int len;
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if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
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return -EINVAL;
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switch(ctx->family) {
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case NFPROTO_IPV4:
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case NFPROTO_IPV6:
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#endif
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case NFPROTO_INET:
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break;
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default:
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return -EOPNOTSUPP;
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}
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priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
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switch(priv->key) {
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case NFT_SOCKET_TRANSPARENT:
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len = sizeof(u8);
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break;
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default:
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return -EOPNOTSUPP;
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}
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priv->dreg = nft_parse_register(tb[NFTA_SOCKET_DREG]);
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return nft_validate_register_store(ctx, priv->dreg, NULL,
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NFT_DATA_VALUE, len);
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}
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static int nft_socket_dump(struct sk_buff *skb,
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const struct nft_expr *expr)
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{
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const struct nft_socket *priv = nft_expr_priv(expr);
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if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
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return -1;
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if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
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return -1;
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return 0;
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}
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static struct nft_expr_type nft_socket_type;
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static const struct nft_expr_ops nft_socket_ops = {
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.type = &nft_socket_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
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.eval = nft_socket_eval,
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.init = nft_socket_init,
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.dump = nft_socket_dump,
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};
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static struct nft_expr_type nft_socket_type __read_mostly = {
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.name = "socket",
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.ops = &nft_socket_ops,
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.policy = nft_socket_policy,
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.maxattr = NFTA_SOCKET_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_socket_module_init(void)
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{
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return nft_register_expr(&nft_socket_type);
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}
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static void __exit nft_socket_module_exit(void)
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{
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nft_unregister_expr(&nft_socket_type);
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}
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module_init(nft_socket_module_init);
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module_exit(nft_socket_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Máté Eckl");
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MODULE_DESCRIPTION("nf_tables socket match module");
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MODULE_ALIAS_NFT_EXPR("socket");
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