Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/netlink.h> |
| 15 | #include <linux/netfilter.h> |
| 16 | #include <linux/netfilter/nf_tables.h> |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 17 | #include <linux/in.h> |
| 18 | #include <linux/ip.h> |
| 19 | #include <linux/ipv6.h> |
Ana Rey | afc5be30 | 2014-08-24 14:08:36 +0200 | [diff] [blame] | 20 | #include <linux/smp.h> |
Florian Westphal | e639f7a | 2015-11-28 21:53:05 +0100 | [diff] [blame] | 21 | #include <linux/static_key.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 22 | #include <net/dst.h> |
| 23 | #include <net/sock.h> |
| 24 | #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ |
| 25 | #include <net/netfilter/nf_tables.h> |
Florian Westphal | e639f7a | 2015-11-28 21:53:05 +0100 | [diff] [blame] | 26 | #include <net/netfilter/nf_tables_core.h> |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 27 | #include <net/netfilter/nft_meta.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 28 | |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 29 | #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */ |
| 30 | |
Florian Westphal | b07edbe | 2016-02-16 17:24:08 +0100 | [diff] [blame] | 31 | static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state); |
| 32 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 33 | void nft_meta_get_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 34 | struct nft_regs *regs, |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 35 | const struct nft_pktinfo *pkt) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 36 | { |
| 37 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 38 | const struct sk_buff *skb = pkt->skb; |
| 39 | const struct net_device *in = pkt->in, *out = pkt->out; |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 40 | struct sock *sk; |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 41 | u32 *dest = ®s->data[priv->dreg]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 42 | |
| 43 | switch (priv->key) { |
| 44 | case NFT_META_LEN: |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 45 | *dest = skb->len; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 46 | break; |
| 47 | case NFT_META_PROTOCOL: |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 48 | nft_reg_store16(dest, (__force u16)skb->protocol); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 49 | break; |
Patrick McHardy | 124edfa | 2014-01-03 12:16:17 +0000 | [diff] [blame] | 50 | case NFT_META_NFPROTO: |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 51 | nft_reg_store8(dest, pkt->pf); |
Patrick McHardy | 124edfa | 2014-01-03 12:16:17 +0000 | [diff] [blame] | 52 | break; |
Patrick McHardy | 4566bf2 | 2014-01-03 12:16:18 +0000 | [diff] [blame] | 53 | case NFT_META_L4PROTO: |
Pablo Neira Ayuso | beac5af | 2016-09-09 12:42:49 +0200 | [diff] [blame] | 54 | if (!pkt->tprot_set) |
| 55 | goto err; |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 56 | nft_reg_store8(dest, pkt->tprot); |
Patrick McHardy | 4566bf2 | 2014-01-03 12:16:18 +0000 | [diff] [blame] | 57 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 58 | case NFT_META_PRIORITY: |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 59 | *dest = skb->priority; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 60 | break; |
| 61 | case NFT_META_MARK: |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 62 | *dest = skb->mark; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 63 | break; |
| 64 | case NFT_META_IIF: |
| 65 | if (in == NULL) |
| 66 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 67 | *dest = in->ifindex; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 68 | break; |
| 69 | case NFT_META_OIF: |
| 70 | if (out == NULL) |
| 71 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 72 | *dest = out->ifindex; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 73 | break; |
| 74 | case NFT_META_IIFNAME: |
| 75 | if (in == NULL) |
| 76 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 77 | strncpy((char *)dest, in->name, IFNAMSIZ); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 78 | break; |
| 79 | case NFT_META_OIFNAME: |
| 80 | if (out == NULL) |
| 81 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 82 | strncpy((char *)dest, out->name, IFNAMSIZ); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 83 | break; |
| 84 | case NFT_META_IIFTYPE: |
| 85 | if (in == NULL) |
| 86 | goto err; |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 87 | nft_reg_store16(dest, in->type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 88 | break; |
| 89 | case NFT_META_OIFTYPE: |
| 90 | if (out == NULL) |
| 91 | goto err; |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 92 | nft_reg_store16(dest, out->type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 93 | break; |
| 94 | case NFT_META_SKUID: |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 95 | sk = skb_to_full_sk(skb); |
| 96 | if (!sk || !sk_fullsock(sk)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 97 | goto err; |
| 98 | |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 99 | read_lock_bh(&sk->sk_callback_lock); |
| 100 | if (sk->sk_socket == NULL || |
| 101 | sk->sk_socket->file == NULL) { |
| 102 | read_unlock_bh(&sk->sk_callback_lock); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 103 | goto err; |
| 104 | } |
| 105 | |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 106 | *dest = from_kuid_munged(&init_user_ns, |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 107 | sk->sk_socket->file->f_cred->fsuid); |
| 108 | read_unlock_bh(&sk->sk_callback_lock); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 109 | break; |
| 110 | case NFT_META_SKGID: |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 111 | sk = skb_to_full_sk(skb); |
| 112 | if (!sk || !sk_fullsock(sk)) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 113 | goto err; |
| 114 | |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 115 | read_lock_bh(&sk->sk_callback_lock); |
| 116 | if (sk->sk_socket == NULL || |
| 117 | sk->sk_socket->file == NULL) { |
| 118 | read_unlock_bh(&sk->sk_callback_lock); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 119 | goto err; |
| 120 | } |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 121 | *dest = from_kgid_munged(&init_user_ns, |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 122 | sk->sk_socket->file->f_cred->fsgid); |
| 123 | read_unlock_bh(&sk->sk_callback_lock); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 124 | break; |
Paul Bolle | 06efbd6 | 2014-02-12 10:53:01 +0100 | [diff] [blame] | 125 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 126 | case NFT_META_RTCLASSID: { |
| 127 | const struct dst_entry *dst = skb_dst(skb); |
| 128 | |
| 129 | if (dst == NULL) |
| 130 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 131 | *dest = dst->tclassid; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 132 | break; |
| 133 | } |
| 134 | #endif |
| 135 | #ifdef CONFIG_NETWORK_SECMARK |
| 136 | case NFT_META_SECMARK: |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 137 | *dest = skb->secmark; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 138 | break; |
| 139 | #endif |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 140 | case NFT_META_PKTTYPE: |
| 141 | if (skb->pkt_type != PACKET_LOOPBACK) { |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 142 | nft_reg_store8(dest, skb->pkt_type); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 143 | break; |
| 144 | } |
| 145 | |
Eric W. Biederman | 6aa187f | 2015-09-18 14:32:57 -0500 | [diff] [blame] | 146 | switch (pkt->pf) { |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 147 | case NFPROTO_IPV4: |
| 148 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 149 | nft_reg_store8(dest, PACKET_MULTICAST); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 150 | else |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 151 | nft_reg_store8(dest, PACKET_BROADCAST); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 152 | break; |
| 153 | case NFPROTO_IPV6: |
| 154 | if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 155 | nft_reg_store8(dest, PACKET_MULTICAST); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 156 | else |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 157 | nft_reg_store8(dest, PACKET_BROADCAST); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 158 | break; |
Liping Zhang | c5493c6 | 2017-01-07 21:33:55 +0800 | [diff] [blame] | 159 | case NFPROTO_NETDEV: |
| 160 | switch (skb->protocol) { |
| 161 | case htons(ETH_P_IP): { |
| 162 | int noff = skb_network_offset(skb); |
| 163 | struct iphdr *iph, _iph; |
| 164 | |
| 165 | iph = skb_header_pointer(skb, noff, |
| 166 | sizeof(_iph), &_iph); |
| 167 | if (!iph) |
| 168 | goto err; |
| 169 | |
| 170 | if (ipv4_is_multicast(iph->daddr)) |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 171 | nft_reg_store8(dest, PACKET_MULTICAST); |
Liping Zhang | c5493c6 | 2017-01-07 21:33:55 +0800 | [diff] [blame] | 172 | else |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 173 | nft_reg_store8(dest, PACKET_BROADCAST); |
Liping Zhang | c5493c6 | 2017-01-07 21:33:55 +0800 | [diff] [blame] | 174 | |
| 175 | break; |
| 176 | } |
| 177 | case htons(ETH_P_IPV6): |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 178 | nft_reg_store8(dest, PACKET_MULTICAST); |
Liping Zhang | c5493c6 | 2017-01-07 21:33:55 +0800 | [diff] [blame] | 179 | break; |
| 180 | default: |
| 181 | WARN_ON_ONCE(1); |
| 182 | goto err; |
| 183 | } |
| 184 | break; |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 185 | default: |
Liping Zhang | c5493c6 | 2017-01-07 21:33:55 +0800 | [diff] [blame] | 186 | WARN_ON_ONCE(1); |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 187 | goto err; |
| 188 | } |
| 189 | break; |
Ana Rey | afc5be30 | 2014-08-24 14:08:36 +0200 | [diff] [blame] | 190 | case NFT_META_CPU: |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 191 | *dest = raw_smp_processor_id(); |
Ana Rey | afc5be30 | 2014-08-24 14:08:36 +0200 | [diff] [blame] | 192 | break; |
Ana Rey | 3045d76 | 2014-09-02 20:36:14 +0200 | [diff] [blame] | 193 | case NFT_META_IIFGROUP: |
| 194 | if (in == NULL) |
| 195 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 196 | *dest = in->group; |
Ana Rey | 3045d76 | 2014-09-02 20:36:14 +0200 | [diff] [blame] | 197 | break; |
| 198 | case NFT_META_OIFGROUP: |
| 199 | if (out == NULL) |
| 200 | goto err; |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 201 | *dest = out->group; |
Ana Rey | 3045d76 | 2014-09-02 20:36:14 +0200 | [diff] [blame] | 202 | break; |
Mathias Krause | e181a54 | 2015-07-19 22:21:13 +0200 | [diff] [blame] | 203 | #ifdef CONFIG_CGROUP_NET_CLASSID |
Ana Rey | ce67417 | 2014-11-03 18:10:50 +0100 | [diff] [blame] | 204 | case NFT_META_CGROUP: |
Eric Dumazet | 3aed822 | 2015-11-08 10:54:12 -0800 | [diff] [blame] | 205 | sk = skb_to_full_sk(skb); |
| 206 | if (!sk || !sk_fullsock(sk)) |
Pablo Neira Ayuso | c5035c7 | 2015-03-27 12:14:13 +0100 | [diff] [blame] | 207 | goto err; |
Tejun Heo | 2a56a1f | 2015-12-07 17:38:52 -0500 | [diff] [blame] | 208 | *dest = sock_cgroup_classid(&sk->sk_cgrp_data); |
Ana Rey | ce67417 | 2014-11-03 18:10:50 +0100 | [diff] [blame] | 209 | break; |
Mathias Krause | e181a54 | 2015-07-19 22:21:13 +0200 | [diff] [blame] | 210 | #endif |
Florian Westphal | b07edbe | 2016-02-16 17:24:08 +0100 | [diff] [blame] | 211 | case NFT_META_PRANDOM: { |
| 212 | struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); |
| 213 | *dest = prandom_u32_state(state); |
| 214 | break; |
| 215 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 216 | default: |
| 217 | WARN_ON(1); |
| 218 | goto err; |
| 219 | } |
| 220 | return; |
| 221 | |
| 222 | err: |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 223 | regs->verdict.code = NFT_BREAK; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 224 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 225 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 226 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 227 | void nft_meta_set_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 228 | struct nft_regs *regs, |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 229 | const struct nft_pktinfo *pkt) |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 230 | { |
| 231 | const struct nft_meta *meta = nft_expr_priv(expr); |
| 232 | struct sk_buff *skb = pkt->skb; |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 233 | u32 *sreg = ®s->data[meta->sreg]; |
| 234 | u32 value = *sreg; |
| 235 | u8 pkt_type; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 236 | |
| 237 | switch (meta->key) { |
| 238 | case NFT_META_MARK: |
| 239 | skb->mark = value; |
| 240 | break; |
| 241 | case NFT_META_PRIORITY: |
| 242 | skb->priority = value; |
| 243 | break; |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 244 | case NFT_META_PKTTYPE: |
Liping Zhang | 1894d7c | 2017-03-08 22:54:18 +0800 | [diff] [blame] | 245 | pkt_type = nft_reg_load8(sreg); |
| 246 | |
| 247 | if (skb->pkt_type != pkt_type && |
| 248 | skb_pkt_type_ok(pkt_type) && |
| 249 | skb_pkt_type_ok(skb->pkt_type)) |
| 250 | skb->pkt_type = pkt_type; |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 251 | break; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 252 | case NFT_META_NFTRACE: |
Liping Zhang | 62131e5 | 2016-06-08 20:20:10 +0800 | [diff] [blame] | 253 | skb->nf_trace = !!value; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 254 | break; |
| 255 | default: |
| 256 | WARN_ON(1); |
| 257 | } |
| 258 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 259 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 260 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 261 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 262 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
| 263 | [NFTA_META_KEY] = { .type = NLA_U32 }, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 264 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 265 | }; |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 266 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 267 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 268 | int nft_meta_get_init(const struct nft_ctx *ctx, |
| 269 | const struct nft_expr *expr, |
| 270 | const struct nlattr * const tb[]) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 271 | { |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 272 | struct nft_meta *priv = nft_expr_priv(expr); |
Patrick McHardy | 45d9bcd | 2015-04-11 02:27:26 +0100 | [diff] [blame] | 273 | unsigned int len; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 274 | |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 275 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
| 276 | switch (priv->key) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 277 | case NFT_META_PROTOCOL: |
Patrick McHardy | 45d9bcd | 2015-04-11 02:27:26 +0100 | [diff] [blame] | 278 | case NFT_META_IIFTYPE: |
| 279 | case NFT_META_OIFTYPE: |
| 280 | len = sizeof(u16); |
| 281 | break; |
Patrick McHardy | 124edfa | 2014-01-03 12:16:17 +0000 | [diff] [blame] | 282 | case NFT_META_NFPROTO: |
Patrick McHardy | 4566bf2 | 2014-01-03 12:16:18 +0000 | [diff] [blame] | 283 | case NFT_META_L4PROTO: |
Patrick McHardy | 45d9bcd | 2015-04-11 02:27:26 +0100 | [diff] [blame] | 284 | case NFT_META_LEN: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 285 | case NFT_META_PRIORITY: |
| 286 | case NFT_META_MARK: |
| 287 | case NFT_META_IIF: |
| 288 | case NFT_META_OIF: |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 289 | case NFT_META_SKUID: |
| 290 | case NFT_META_SKGID: |
Paul Bolle | 06efbd6 | 2014-02-12 10:53:01 +0100 | [diff] [blame] | 291 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 292 | case NFT_META_RTCLASSID: |
| 293 | #endif |
| 294 | #ifdef CONFIG_NETWORK_SECMARK |
| 295 | case NFT_META_SECMARK: |
| 296 | #endif |
Ana Rey | e2a093f | 2014-08-06 13:52:49 +0200 | [diff] [blame] | 297 | case NFT_META_PKTTYPE: |
Ana Rey | afc5be30 | 2014-08-24 14:08:36 +0200 | [diff] [blame] | 298 | case NFT_META_CPU: |
Ana Rey | 3045d76 | 2014-09-02 20:36:14 +0200 | [diff] [blame] | 299 | case NFT_META_IIFGROUP: |
| 300 | case NFT_META_OIFGROUP: |
Mathias Krause | e181a54 | 2015-07-19 22:21:13 +0200 | [diff] [blame] | 301 | #ifdef CONFIG_CGROUP_NET_CLASSID |
Ana Rey | ce67417 | 2014-11-03 18:10:50 +0100 | [diff] [blame] | 302 | case NFT_META_CGROUP: |
Mathias Krause | e181a54 | 2015-07-19 22:21:13 +0200 | [diff] [blame] | 303 | #endif |
Patrick McHardy | 45d9bcd | 2015-04-11 02:27:26 +0100 | [diff] [blame] | 304 | len = sizeof(u32); |
| 305 | break; |
| 306 | case NFT_META_IIFNAME: |
| 307 | case NFT_META_OIFNAME: |
| 308 | len = IFNAMSIZ; |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 309 | break; |
Florian Westphal | b07edbe | 2016-02-16 17:24:08 +0100 | [diff] [blame] | 310 | case NFT_META_PRANDOM: |
| 311 | prandom_init_once(&nft_prandom_state); |
| 312 | len = sizeof(u32); |
| 313 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 314 | default: |
| 315 | return -EOPNOTSUPP; |
| 316 | } |
| 317 | |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 318 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
Patrick McHardy | 27e6d20 | 2015-04-11 02:27:29 +0100 | [diff] [blame] | 319 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
| 320 | NFT_DATA_VALUE, len); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 321 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 322 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 323 | |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 324 | int nft_meta_set_validate(const struct nft_ctx *ctx, |
| 325 | const struct nft_expr *expr, |
| 326 | const struct nft_data **data) |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 327 | { |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 328 | struct nft_meta *priv = nft_expr_priv(expr); |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 329 | unsigned int hooks; |
| 330 | |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 331 | if (priv->key != NFT_META_PKTTYPE) |
| 332 | return 0; |
| 333 | |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 334 | switch (ctx->afi->family) { |
| 335 | case NFPROTO_BRIDGE: |
| 336 | hooks = 1 << NF_BR_PRE_ROUTING; |
| 337 | break; |
| 338 | case NFPROTO_NETDEV: |
| 339 | hooks = 1 << NF_NETDEV_INGRESS; |
| 340 | break; |
| 341 | default: |
| 342 | return -EOPNOTSUPP; |
| 343 | } |
| 344 | |
| 345 | return nft_chain_validate_hooks(ctx->chain, hooks); |
| 346 | } |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 347 | EXPORT_SYMBOL_GPL(nft_meta_set_validate); |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 348 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 349 | int nft_meta_set_init(const struct nft_ctx *ctx, |
| 350 | const struct nft_expr *expr, |
| 351 | const struct nlattr * const tb[]) |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 352 | { |
| 353 | struct nft_meta *priv = nft_expr_priv(expr); |
Patrick McHardy | d07db98 | 2015-04-11 02:27:30 +0100 | [diff] [blame] | 354 | unsigned int len; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 355 | int err; |
| 356 | |
| 357 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 358 | switch (priv->key) { |
| 359 | case NFT_META_MARK: |
| 360 | case NFT_META_PRIORITY: |
Patrick McHardy | d07db98 | 2015-04-11 02:27:30 +0100 | [diff] [blame] | 361 | len = sizeof(u32); |
| 362 | break; |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 363 | case NFT_META_NFTRACE: |
Patrick McHardy | d07db98 | 2015-04-11 02:27:30 +0100 | [diff] [blame] | 364 | len = sizeof(u8); |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 365 | break; |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 366 | case NFT_META_PKTTYPE: |
Florian Westphal | b4aae75 | 2015-12-10 18:04:07 +0100 | [diff] [blame] | 367 | len = sizeof(u8); |
| 368 | break; |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 369 | default: |
| 370 | return -EOPNOTSUPP; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 371 | } |
| 372 | |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 373 | err = nft_meta_set_validate(ctx, expr, NULL); |
| 374 | if (err < 0) |
| 375 | return err; |
| 376 | |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 377 | priv->sreg = nft_parse_register(tb[NFTA_META_SREG]); |
Patrick McHardy | d07db98 | 2015-04-11 02:27:30 +0100 | [diff] [blame] | 378 | err = nft_validate_register_load(priv->sreg, len); |
Pablo Neira Ayuso | b38895c | 2014-01-09 20:03:55 +0100 | [diff] [blame] | 379 | if (err < 0) |
| 380 | return err; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 381 | |
Florian Westphal | e639f7a | 2015-11-28 21:53:05 +0100 | [diff] [blame] | 382 | if (priv->key == NFT_META_NFTRACE) |
| 383 | static_branch_inc(&nft_trace_enabled); |
| 384 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 385 | return 0; |
| 386 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 387 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 388 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 389 | int nft_meta_get_dump(struct sk_buff *skb, |
| 390 | const struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 391 | { |
| 392 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 393 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 394 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
| 395 | goto nla_put_failure; |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 396 | if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 397 | goto nla_put_failure; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 398 | return 0; |
| 399 | |
| 400 | nla_put_failure: |
| 401 | return -1; |
| 402 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 403 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 404 | |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 405 | int nft_meta_set_dump(struct sk_buff *skb, |
| 406 | const struct nft_expr *expr) |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 407 | { |
| 408 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 409 | |
| 410 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
| 411 | goto nla_put_failure; |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 412 | if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 413 | goto nla_put_failure; |
| 414 | |
| 415 | return 0; |
| 416 | |
| 417 | nla_put_failure: |
| 418 | return -1; |
| 419 | } |
Tomasz Bursztyka | aa45660 | 2014-04-14 15:41:27 +0300 | [diff] [blame] | 420 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 421 | |
Florian Westphal | e639f7a | 2015-11-28 21:53:05 +0100 | [diff] [blame] | 422 | void nft_meta_set_destroy(const struct nft_ctx *ctx, |
| 423 | const struct nft_expr *expr) |
| 424 | { |
| 425 | const struct nft_meta *priv = nft_expr_priv(expr); |
| 426 | |
| 427 | if (priv->key == NFT_META_NFTRACE) |
| 428 | static_branch_dec(&nft_trace_enabled); |
| 429 | } |
| 430 | EXPORT_SYMBOL_GPL(nft_meta_set_destroy); |
| 431 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 432 | static struct nft_expr_type nft_meta_type; |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 433 | static const struct nft_expr_ops nft_meta_get_ops = { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 434 | .type = &nft_meta_type, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 435 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 436 | .eval = nft_meta_get_eval, |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 437 | .init = nft_meta_get_init, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 438 | .dump = nft_meta_get_dump, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 439 | }; |
| 440 | |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 441 | static const struct nft_expr_ops nft_meta_set_ops = { |
| 442 | .type = &nft_meta_type, |
| 443 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
| 444 | .eval = nft_meta_set_eval, |
Patrick McHardy | d2caa69 | 2014-03-29 10:43:02 +0000 | [diff] [blame] | 445 | .init = nft_meta_set_init, |
Florian Westphal | e639f7a | 2015-11-28 21:53:05 +0100 | [diff] [blame] | 446 | .destroy = nft_meta_set_destroy, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 447 | .dump = nft_meta_set_dump, |
Liping Zhang | 960fa72 | 2016-08-22 22:57:56 +0800 | [diff] [blame] | 448 | .validate = nft_meta_set_validate, |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 449 | }; |
| 450 | |
| 451 | static const struct nft_expr_ops * |
| 452 | nft_meta_select_ops(const struct nft_ctx *ctx, |
| 453 | const struct nlattr * const tb[]) |
| 454 | { |
| 455 | if (tb[NFTA_META_KEY] == NULL) |
| 456 | return ERR_PTR(-EINVAL); |
| 457 | |
| 458 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) |
| 459 | return ERR_PTR(-EINVAL); |
| 460 | |
| 461 | if (tb[NFTA_META_DREG]) |
| 462 | return &nft_meta_get_ops; |
| 463 | |
| 464 | if (tb[NFTA_META_SREG]) |
| 465 | return &nft_meta_set_ops; |
| 466 | |
| 467 | return ERR_PTR(-EINVAL); |
| 468 | } |
| 469 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 470 | static struct nft_expr_type nft_meta_type __read_mostly = { |
| 471 | .name = "meta", |
Arturo Borrero Gonzalez | e035b77 | 2013-12-26 16:38:01 +0100 | [diff] [blame] | 472 | .select_ops = &nft_meta_select_ops, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 473 | .policy = nft_meta_policy, |
| 474 | .maxattr = NFTA_META_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 475 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 476 | }; |
| 477 | |
| 478 | static int __init nft_meta_module_init(void) |
| 479 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 480 | return nft_register_expr(&nft_meta_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | static void __exit nft_meta_module_exit(void) |
| 484 | { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 485 | nft_unregister_expr(&nft_meta_type); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | module_init(nft_meta_module_init); |
| 489 | module_exit(nft_meta_module_exit); |
| 490 | |
| 491 | MODULE_LICENSE("GPL"); |
| 492 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 493 | MODULE_ALIAS_NFT_EXPR("meta"); |