2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2014 Intel Corporation
4 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Development of this code funded by Astaro AG (http://www.astaro.com/)
13 #include <linux/kernel.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nf_tables.h>
19 #include <linux/ipv6.h>
20 #include <linux/smp.h>
21 #include <linux/static_key.h>
24 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
25 #include <net/netfilter/nf_tables.h>
26 #include <net/netfilter/nf_tables_core.h>
28 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
31 enum nft_meta_keys key:8;
33 enum nft_registers dreg:8;
34 enum nft_registers sreg:8;
38 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
40 #ifdef CONFIG_NF_TABLES_BRIDGE
41 #include "../bridge/br_private.h"
44 static void nft_meta_get_eval(const struct nft_expr *expr,
45 struct nft_regs *regs,
46 const struct nft_pktinfo *pkt)
48 const struct nft_meta *priv = nft_expr_priv(expr);
49 const struct sk_buff *skb = pkt->skb;
50 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
52 u32 *dest = ®s->data[priv->dreg];
53 #ifdef CONFIG_NF_TABLES_BRIDGE
54 const struct net_bridge_port *p;
61 case NFT_META_PROTOCOL:
62 nft_reg_store16(dest, (__force u16)skb->protocol);
64 case NFT_META_NFPROTO:
65 nft_reg_store8(dest, nft_pf(pkt));
67 case NFT_META_L4PROTO:
70 nft_reg_store8(dest, pkt->tprot);
72 case NFT_META_PRIORITY:
73 *dest = skb->priority;
88 case NFT_META_IIFNAME:
91 strncpy((char *)dest, in->name, IFNAMSIZ);
93 case NFT_META_OIFNAME:
96 strncpy((char *)dest, out->name, IFNAMSIZ);
98 case NFT_META_IIFTYPE:
101 nft_reg_store16(dest, in->type);
103 case NFT_META_OIFTYPE:
106 nft_reg_store16(dest, out->type);
109 sk = skb_to_full_sk(skb);
110 if (!sk || !sk_fullsock(sk))
113 read_lock_bh(&sk->sk_callback_lock);
114 if (sk->sk_socket == NULL ||
115 sk->sk_socket->file == NULL) {
116 read_unlock_bh(&sk->sk_callback_lock);
120 *dest = from_kuid_munged(&init_user_ns,
121 sk->sk_socket->file->f_cred->fsuid);
122 read_unlock_bh(&sk->sk_callback_lock);
125 sk = skb_to_full_sk(skb);
126 if (!sk || !sk_fullsock(sk))
129 read_lock_bh(&sk->sk_callback_lock);
130 if (sk->sk_socket == NULL ||
131 sk->sk_socket->file == NULL) {
132 read_unlock_bh(&sk->sk_callback_lock);
135 *dest = from_kgid_munged(&init_user_ns,
136 sk->sk_socket->file->f_cred->fsgid);
137 read_unlock_bh(&sk->sk_callback_lock);
139 #ifdef CONFIG_IP_ROUTE_CLASSID
140 case NFT_META_RTCLASSID: {
141 const struct dst_entry *dst = skb_dst(skb);
145 *dest = dst->tclassid;
149 #ifdef CONFIG_NETWORK_SECMARK
150 case NFT_META_SECMARK:
151 *dest = skb->secmark;
154 case NFT_META_PKTTYPE:
155 if (skb->pkt_type != PACKET_LOOPBACK) {
156 nft_reg_store8(dest, skb->pkt_type);
160 switch (nft_pf(pkt)) {
162 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
163 nft_reg_store8(dest, PACKET_MULTICAST);
165 nft_reg_store8(dest, PACKET_BROADCAST);
168 nft_reg_store8(dest, PACKET_MULTICAST);
171 switch (skb->protocol) {
172 case htons(ETH_P_IP): {
173 int noff = skb_network_offset(skb);
174 struct iphdr *iph, _iph;
176 iph = skb_header_pointer(skb, noff,
177 sizeof(_iph), &_iph);
181 if (ipv4_is_multicast(iph->daddr))
182 nft_reg_store8(dest, PACKET_MULTICAST);
184 nft_reg_store8(dest, PACKET_BROADCAST);
188 case htons(ETH_P_IPV6):
189 nft_reg_store8(dest, PACKET_MULTICAST);
202 *dest = raw_smp_processor_id();
204 case NFT_META_IIFGROUP:
209 case NFT_META_OIFGROUP:
214 #ifdef CONFIG_CGROUP_NET_CLASSID
215 case NFT_META_CGROUP:
216 sk = skb_to_full_sk(skb);
217 if (!sk || !sk_fullsock(sk))
219 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
222 case NFT_META_PRANDOM: {
223 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
224 *dest = prandom_u32_state(state);
228 case NFT_META_SECPATH:
229 nft_reg_store8(dest, !!skb->sp);
232 #ifdef CONFIG_NF_TABLES_BRIDGE
233 case NFT_META_BRI_IIFNAME:
234 if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
236 strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
238 case NFT_META_BRI_OIFNAME:
239 if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
241 strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
251 regs->verdict.code = NFT_BREAK;
254 static void nft_meta_set_eval(const struct nft_expr *expr,
255 struct nft_regs *regs,
256 const struct nft_pktinfo *pkt)
258 const struct nft_meta *meta = nft_expr_priv(expr);
259 struct sk_buff *skb = pkt->skb;
260 u32 *sreg = ®s->data[meta->sreg];
268 case NFT_META_PRIORITY:
269 skb->priority = value;
271 case NFT_META_PKTTYPE:
272 value8 = nft_reg_load8(sreg);
274 if (skb->pkt_type != value8 &&
275 skb_pkt_type_ok(value8) &&
276 skb_pkt_type_ok(skb->pkt_type))
277 skb->pkt_type = value8;
279 case NFT_META_NFTRACE:
280 value8 = nft_reg_load8(sreg);
282 skb->nf_trace = !!value8;
289 static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
290 [NFTA_META_DREG] = { .type = NLA_U32 },
291 [NFTA_META_KEY] = { .type = NLA_U32 },
292 [NFTA_META_SREG] = { .type = NLA_U32 },
295 static int nft_meta_get_init(const struct nft_ctx *ctx,
296 const struct nft_expr *expr,
297 const struct nlattr * const tb[])
299 struct nft_meta *priv = nft_expr_priv(expr);
302 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
304 case NFT_META_PROTOCOL:
305 case NFT_META_IIFTYPE:
306 case NFT_META_OIFTYPE:
309 case NFT_META_NFPROTO:
310 case NFT_META_L4PROTO:
312 case NFT_META_PRIORITY:
318 #ifdef CONFIG_IP_ROUTE_CLASSID
319 case NFT_META_RTCLASSID:
321 #ifdef CONFIG_NETWORK_SECMARK
322 case NFT_META_SECMARK:
324 case NFT_META_PKTTYPE:
326 case NFT_META_IIFGROUP:
327 case NFT_META_OIFGROUP:
328 #ifdef CONFIG_CGROUP_NET_CLASSID
329 case NFT_META_CGROUP:
333 case NFT_META_IIFNAME:
334 case NFT_META_OIFNAME:
337 case NFT_META_PRANDOM:
338 prandom_init_once(&nft_prandom_state);
342 case NFT_META_SECPATH:
346 #ifdef CONFIG_NF_TABLES_BRIDGE
347 case NFT_META_BRI_IIFNAME:
348 case NFT_META_BRI_OIFNAME:
349 if (ctx->family != NFPROTO_BRIDGE)
358 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
359 return nft_validate_register_store(ctx, priv->dreg, NULL,
360 NFT_DATA_VALUE, len);
363 static int nft_meta_get_validate(const struct nft_ctx *ctx,
364 const struct nft_expr *expr,
365 const struct nft_data **data)
368 const struct nft_meta *priv = nft_expr_priv(expr);
371 if (priv->key != NFT_META_SECPATH)
374 switch (ctx->family) {
376 hooks = 1 << NF_NETDEV_INGRESS;
381 hooks = (1 << NF_INET_PRE_ROUTING) |
382 (1 << NF_INET_LOCAL_IN) |
383 (1 << NF_INET_FORWARD);
389 return nft_chain_validate_hooks(ctx->chain, hooks);
395 static int nft_meta_set_validate(const struct nft_ctx *ctx,
396 const struct nft_expr *expr,
397 const struct nft_data **data)
399 struct nft_meta *priv = nft_expr_priv(expr);
402 if (priv->key != NFT_META_PKTTYPE)
405 switch (ctx->family) {
407 hooks = 1 << NF_BR_PRE_ROUTING;
410 hooks = 1 << NF_NETDEV_INGRESS;
415 hooks = 1 << NF_INET_PRE_ROUTING;
421 return nft_chain_validate_hooks(ctx->chain, hooks);
424 static int nft_meta_set_init(const struct nft_ctx *ctx,
425 const struct nft_expr *expr,
426 const struct nlattr * const tb[])
428 struct nft_meta *priv = nft_expr_priv(expr);
432 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
435 case NFT_META_PRIORITY:
438 case NFT_META_NFTRACE:
441 case NFT_META_PKTTYPE:
448 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
449 err = nft_validate_register_load(priv->sreg, len);
453 if (priv->key == NFT_META_NFTRACE)
454 static_branch_inc(&nft_trace_enabled);
459 static int nft_meta_get_dump(struct sk_buff *skb,
460 const struct nft_expr *expr)
462 const struct nft_meta *priv = nft_expr_priv(expr);
464 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
465 goto nla_put_failure;
466 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
467 goto nla_put_failure;
474 static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
476 const struct nft_meta *priv = nft_expr_priv(expr);
478 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
479 goto nla_put_failure;
480 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
481 goto nla_put_failure;
489 static void nft_meta_set_destroy(const struct nft_ctx *ctx,
490 const struct nft_expr *expr)
492 const struct nft_meta *priv = nft_expr_priv(expr);
494 if (priv->key == NFT_META_NFTRACE)
495 static_branch_dec(&nft_trace_enabled);
498 static const struct nft_expr_ops nft_meta_get_ops = {
499 .type = &nft_meta_type,
500 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
501 .eval = nft_meta_get_eval,
502 .init = nft_meta_get_init,
503 .dump = nft_meta_get_dump,
504 .validate = nft_meta_get_validate,
507 static const struct nft_expr_ops nft_meta_set_ops = {
508 .type = &nft_meta_type,
509 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
510 .eval = nft_meta_set_eval,
511 .init = nft_meta_set_init,
512 .destroy = nft_meta_set_destroy,
513 .dump = nft_meta_set_dump,
514 .validate = nft_meta_set_validate,
517 static const struct nft_expr_ops *
518 nft_meta_select_ops(const struct nft_ctx *ctx,
519 const struct nlattr * const tb[])
521 if (tb[NFTA_META_KEY] == NULL)
522 return ERR_PTR(-EINVAL);
524 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
525 return ERR_PTR(-EINVAL);
527 if (tb[NFTA_META_DREG])
528 return &nft_meta_get_ops;
530 if (tb[NFTA_META_SREG])
531 return &nft_meta_set_ops;
533 return ERR_PTR(-EINVAL);
536 struct nft_expr_type nft_meta_type __read_mostly = {
538 .select_ops = nft_meta_select_ops,
539 .policy = nft_meta_policy,
540 .maxattr = NFTA_META_MAX,
541 .owner = THIS_MODULE,