![Pablo Neira Ayuso](/assets/img/avatar_default.png)
Conflicts: net/netfilter/core.c net/netfilter/nf_tables_netdev.c Resolve two conflicts before pull request for David's net-next tree: 1) Betweenc73c248490
("netfilter: nf_tables_netdev: remove redundant ip_hdr assignment") from the net tree and commitddc8b6027a
("netfilter: introduce nft_set_pktinfo_{ipv4, ipv6}_validate()"). 2) Betweene8bffe0cf9
("net: Add _nf_(un)register_hooks symbols") and Aaron Conole's patches to replace list_head with single linked list. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
466 lines
10 KiB
C
466 lines
10 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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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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* Development of this code funded by Astaro AG (http://www.astaro.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/nf_tables.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/smp.h>
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#include <linux/static_key.h>
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#include <net/dst.h>
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#include <net/sock.h>
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#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
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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/nft_meta.h>
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#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
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static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
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void nft_meta_get_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_meta *priv = nft_expr_priv(expr);
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const struct sk_buff *skb = pkt->skb;
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const struct net_device *in = pkt->in, *out = pkt->out;
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struct sock *sk;
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u32 *dest = ®s->data[priv->dreg];
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switch (priv->key) {
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case NFT_META_LEN:
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*dest = skb->len;
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break;
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case NFT_META_PROTOCOL:
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*dest = 0;
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*(__be16 *)dest = skb->protocol;
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break;
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case NFT_META_NFPROTO:
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*dest = pkt->pf;
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break;
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case NFT_META_L4PROTO:
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if (!pkt->tprot_set)
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goto err;
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*dest = pkt->tprot;
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break;
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case NFT_META_PRIORITY:
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*dest = skb->priority;
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break;
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case NFT_META_MARK:
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*dest = skb->mark;
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break;
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case NFT_META_IIF:
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if (in == NULL)
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goto err;
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*dest = in->ifindex;
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break;
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case NFT_META_OIF:
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if (out == NULL)
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goto err;
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*dest = out->ifindex;
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break;
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case NFT_META_IIFNAME:
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if (in == NULL)
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goto err;
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strncpy((char *)dest, in->name, IFNAMSIZ);
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break;
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case NFT_META_OIFNAME:
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if (out == NULL)
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goto err;
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strncpy((char *)dest, out->name, IFNAMSIZ);
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break;
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case NFT_META_IIFTYPE:
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if (in == NULL)
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goto err;
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*dest = 0;
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*(u16 *)dest = in->type;
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break;
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case NFT_META_OIFTYPE:
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if (out == NULL)
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goto err;
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*dest = 0;
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*(u16 *)dest = out->type;
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break;
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case NFT_META_SKUID:
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sk = skb_to_full_sk(skb);
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if (!sk || !sk_fullsock(sk))
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goto err;
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read_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_socket == NULL ||
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sk->sk_socket->file == NULL) {
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read_unlock_bh(&sk->sk_callback_lock);
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goto err;
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}
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*dest = from_kuid_munged(&init_user_ns,
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sk->sk_socket->file->f_cred->fsuid);
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read_unlock_bh(&sk->sk_callback_lock);
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break;
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case NFT_META_SKGID:
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sk = skb_to_full_sk(skb);
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if (!sk || !sk_fullsock(sk))
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goto err;
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read_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_socket == NULL ||
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sk->sk_socket->file == NULL) {
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read_unlock_bh(&sk->sk_callback_lock);
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goto err;
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}
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*dest = from_kgid_munged(&init_user_ns,
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sk->sk_socket->file->f_cred->fsgid);
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read_unlock_bh(&sk->sk_callback_lock);
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break;
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_META_RTCLASSID: {
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const struct dst_entry *dst = skb_dst(skb);
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if (dst == NULL)
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goto err;
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*dest = dst->tclassid;
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break;
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}
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#endif
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#ifdef CONFIG_NETWORK_SECMARK
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case NFT_META_SECMARK:
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*dest = skb->secmark;
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break;
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#endif
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case NFT_META_PKTTYPE:
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if (skb->pkt_type != PACKET_LOOPBACK) {
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*dest = skb->pkt_type;
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break;
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}
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switch (pkt->pf) {
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case NFPROTO_IPV4:
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if (ipv4_is_multicast(ip_hdr(skb)->daddr))
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*dest = PACKET_MULTICAST;
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else
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*dest = PACKET_BROADCAST;
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break;
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case NFPROTO_IPV6:
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if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
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*dest = PACKET_MULTICAST;
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else
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*dest = PACKET_BROADCAST;
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break;
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default:
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WARN_ON(1);
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goto err;
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}
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break;
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case NFT_META_CPU:
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*dest = raw_smp_processor_id();
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break;
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case NFT_META_IIFGROUP:
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if (in == NULL)
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goto err;
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*dest = in->group;
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break;
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case NFT_META_OIFGROUP:
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if (out == NULL)
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goto err;
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*dest = out->group;
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break;
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#ifdef CONFIG_CGROUP_NET_CLASSID
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case NFT_META_CGROUP:
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sk = skb_to_full_sk(skb);
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if (!sk || !sk_fullsock(sk))
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goto err;
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*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
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break;
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#endif
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case NFT_META_PRANDOM: {
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struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
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*dest = prandom_u32_state(state);
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break;
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}
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default:
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WARN_ON(1);
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goto err;
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}
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return;
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err:
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regs->verdict.code = NFT_BREAK;
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}
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EXPORT_SYMBOL_GPL(nft_meta_get_eval);
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void nft_meta_set_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_meta *meta = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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u32 value = regs->data[meta->sreg];
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switch (meta->key) {
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case NFT_META_MARK:
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skb->mark = value;
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break;
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case NFT_META_PRIORITY:
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skb->priority = value;
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break;
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case NFT_META_PKTTYPE:
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if (skb->pkt_type != value &&
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skb_pkt_type_ok(value) && skb_pkt_type_ok(skb->pkt_type))
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skb->pkt_type = value;
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break;
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case NFT_META_NFTRACE:
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skb->nf_trace = !!value;
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break;
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default:
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WARN_ON(1);
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}
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_eval);
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const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
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[NFTA_META_DREG] = { .type = NLA_U32 },
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[NFTA_META_KEY] = { .type = NLA_U32 },
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[NFTA_META_SREG] = { .type = NLA_U32 },
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};
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EXPORT_SYMBOL_GPL(nft_meta_policy);
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int nft_meta_get_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_meta *priv = nft_expr_priv(expr);
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unsigned int len;
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priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
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switch (priv->key) {
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case NFT_META_PROTOCOL:
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case NFT_META_IIFTYPE:
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case NFT_META_OIFTYPE:
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len = sizeof(u16);
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break;
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case NFT_META_NFPROTO:
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case NFT_META_L4PROTO:
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case NFT_META_LEN:
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case NFT_META_PRIORITY:
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case NFT_META_MARK:
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case NFT_META_IIF:
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case NFT_META_OIF:
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case NFT_META_SKUID:
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case NFT_META_SKGID:
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_META_RTCLASSID:
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#endif
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#ifdef CONFIG_NETWORK_SECMARK
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case NFT_META_SECMARK:
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#endif
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case NFT_META_PKTTYPE:
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case NFT_META_CPU:
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case NFT_META_IIFGROUP:
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case NFT_META_OIFGROUP:
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#ifdef CONFIG_CGROUP_NET_CLASSID
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case NFT_META_CGROUP:
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#endif
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len = sizeof(u32);
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break;
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case NFT_META_IIFNAME:
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case NFT_META_OIFNAME:
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len = IFNAMSIZ;
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break;
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case NFT_META_PRANDOM:
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prandom_init_once(&nft_prandom_state);
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len = sizeof(u32);
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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_META_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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EXPORT_SYMBOL_GPL(nft_meta_get_init);
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int nft_meta_set_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 nft_meta *priv = nft_expr_priv(expr);
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unsigned int hooks;
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if (priv->key != NFT_META_PKTTYPE)
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return 0;
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switch (ctx->afi->family) {
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case NFPROTO_BRIDGE:
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hooks = 1 << NF_BR_PRE_ROUTING;
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break;
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case NFPROTO_NETDEV:
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hooks = 1 << NF_NETDEV_INGRESS;
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break;
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default:
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return -EOPNOTSUPP;
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}
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return nft_chain_validate_hooks(ctx->chain, hooks);
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_validate);
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int nft_meta_set_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_meta *priv = nft_expr_priv(expr);
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unsigned int len;
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int err;
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priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
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switch (priv->key) {
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case NFT_META_MARK:
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case NFT_META_PRIORITY:
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len = sizeof(u32);
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break;
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case NFT_META_NFTRACE:
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len = sizeof(u8);
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break;
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case NFT_META_PKTTYPE:
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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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err = nft_meta_set_validate(ctx, expr, NULL);
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if (err < 0)
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return err;
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priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
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err = nft_validate_register_load(priv->sreg, len);
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if (err < 0)
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return err;
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if (priv->key == NFT_META_NFTRACE)
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static_branch_inc(&nft_trace_enabled);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_init);
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int nft_meta_get_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_meta *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
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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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EXPORT_SYMBOL_GPL(nft_meta_get_dump);
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int nft_meta_set_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_meta *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
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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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EXPORT_SYMBOL_GPL(nft_meta_set_dump);
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void nft_meta_set_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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const struct nft_meta *priv = nft_expr_priv(expr);
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if (priv->key == NFT_META_NFTRACE)
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static_branch_dec(&nft_trace_enabled);
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
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static struct nft_expr_type nft_meta_type;
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static const struct nft_expr_ops nft_meta_get_ops = {
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.type = &nft_meta_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
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.eval = nft_meta_get_eval,
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.init = nft_meta_get_init,
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.dump = nft_meta_get_dump,
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};
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static const struct nft_expr_ops nft_meta_set_ops = {
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.type = &nft_meta_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
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.eval = nft_meta_set_eval,
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.init = nft_meta_set_init,
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.destroy = nft_meta_set_destroy,
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.dump = nft_meta_set_dump,
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.validate = nft_meta_set_validate,
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};
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static const struct nft_expr_ops *
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nft_meta_select_ops(const struct nft_ctx *ctx,
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const struct nlattr * const tb[])
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{
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if (tb[NFTA_META_KEY] == NULL)
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return ERR_PTR(-EINVAL);
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if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
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return ERR_PTR(-EINVAL);
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if (tb[NFTA_META_DREG])
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return &nft_meta_get_ops;
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if (tb[NFTA_META_SREG])
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return &nft_meta_set_ops;
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return ERR_PTR(-EINVAL);
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}
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static struct nft_expr_type nft_meta_type __read_mostly = {
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.name = "meta",
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.select_ops = &nft_meta_select_ops,
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.policy = nft_meta_policy,
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.maxattr = NFTA_META_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_meta_module_init(void)
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{
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return nft_register_expr(&nft_meta_type);
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}
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static void __exit nft_meta_module_exit(void)
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{
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nft_unregister_expr(&nft_meta_type);
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}
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module_init(nft_meta_module_init);
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module_exit(nft_meta_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_EXPR("meta");
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