Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
96518518 | 2 | /* |
ef1f7df9 | 3 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
bd2bbdb4 FW |
4 | * Copyright (c) 2014 Intel Corporation |
5 | * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> | |
96518518 | 6 | * |
96518518 PM |
7 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
96518518 PM |
11 | #include <linux/netlink.h> |
12 | #include <linux/netfilter.h> | |
13 | #include <linux/netfilter/nf_tables.h> | |
e2a093ff AR |
14 | #include <linux/in.h> |
15 | #include <linux/ip.h> | |
16 | #include <linux/ipv6.h> | |
afc5be30 | 17 | #include <linux/smp.h> |
e639f7ab | 18 | #include <linux/static_key.h> |
96518518 PM |
19 | #include <net/dst.h> |
20 | #include <net/sock.h> | |
21 | #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ | |
22 | #include <net/netfilter/nf_tables.h> | |
e639f7ab | 23 | #include <net/netfilter/nf_tables_core.h> |
30e103fe | 24 | #include <net/netfilter/nft_meta.h> |
c9626a2c | 25 | #include <net/netfilter/nf_tables_offload.h> |
96518518 | 26 | |
b4aae759 FW |
27 | #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */ |
28 | ||
63d10e12 AJ |
29 | #define NFT_META_SECS_PER_MINUTE 60 |
30 | #define NFT_META_SECS_PER_HOUR 3600 | |
31 | #define NFT_META_SECS_PER_DAY 86400 | |
32 | #define NFT_META_DAYS_PER_WEEK 7 | |
33 | ||
b07edbe1 FW |
34 | static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state); |
35 | ||
63d10e12 AJ |
36 | static u8 nft_meta_weekday(unsigned long secs) |
37 | { | |
38 | unsigned int dse; | |
39 | u8 wday; | |
40 | ||
41 | secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest; | |
42 | dse = secs / NFT_META_SECS_PER_DAY; | |
43 | wday = (4 + dse) % NFT_META_DAYS_PER_WEEK; | |
44 | ||
45 | return wday; | |
46 | } | |
47 | ||
48 | static u32 nft_meta_hour(unsigned long secs) | |
49 | { | |
50 | struct tm tm; | |
51 | ||
52 | time64_to_tm(secs, 0, &tm); | |
53 | ||
54 | return tm.tm_hour * NFT_META_SECS_PER_HOUR | |
55 | + tm.tm_min * NFT_META_SECS_PER_MINUTE | |
56 | + tm.tm_sec; | |
57 | } | |
58 | ||
222440b4 FW |
59 | void nft_meta_get_eval(const struct nft_expr *expr, |
60 | struct nft_regs *regs, | |
61 | const struct nft_pktinfo *pkt) | |
96518518 PM |
62 | { |
63 | const struct nft_meta *priv = nft_expr_priv(expr); | |
64 | const struct sk_buff *skb = pkt->skb; | |
0e5a1c7e | 65 | const struct net_device *in = nft_in(pkt), *out = nft_out(pkt); |
3aed8225 | 66 | struct sock *sk; |
49499c3e | 67 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
68 | |
69 | switch (priv->key) { | |
70 | case NFT_META_LEN: | |
fad136ea | 71 | *dest = skb->len; |
96518518 PM |
72 | break; |
73 | case NFT_META_PROTOCOL: | |
10596608 | 74 | nft_reg_store16(dest, (__force u16)skb->protocol); |
96518518 | 75 | break; |
124edfa9 | 76 | case NFT_META_NFPROTO: |
10596608 | 77 | nft_reg_store8(dest, nft_pf(pkt)); |
124edfa9 | 78 | break; |
4566bf27 | 79 | case NFT_META_L4PROTO: |
beac5afa PNA |
80 | if (!pkt->tprot_set) |
81 | goto err; | |
10596608 | 82 | nft_reg_store8(dest, pkt->tprot); |
4566bf27 | 83 | break; |
96518518 | 84 | case NFT_META_PRIORITY: |
fad136ea | 85 | *dest = skb->priority; |
96518518 PM |
86 | break; |
87 | case NFT_META_MARK: | |
fad136ea | 88 | *dest = skb->mark; |
96518518 PM |
89 | break; |
90 | case NFT_META_IIF: | |
cb81572e | 91 | *dest = in ? in->ifindex : 0; |
96518518 PM |
92 | break; |
93 | case NFT_META_OIF: | |
cb81572e | 94 | *dest = out ? out->ifindex : 0; |
96518518 PM |
95 | break; |
96 | case NFT_META_IIFNAME: | |
cb81572e | 97 | strncpy((char *)dest, in ? in->name : "", IFNAMSIZ); |
96518518 PM |
98 | break; |
99 | case NFT_META_OIFNAME: | |
cb81572e | 100 | strncpy((char *)dest, out ? out->name : "", IFNAMSIZ); |
96518518 PM |
101 | break; |
102 | case NFT_META_IIFTYPE: | |
103 | if (in == NULL) | |
104 | goto err; | |
10596608 | 105 | nft_reg_store16(dest, in->type); |
96518518 PM |
106 | break; |
107 | case NFT_META_OIFTYPE: | |
108 | if (out == NULL) | |
109 | goto err; | |
10596608 | 110 | nft_reg_store16(dest, out->type); |
96518518 PM |
111 | break; |
112 | case NFT_META_SKUID: | |
3aed8225 | 113 | sk = skb_to_full_sk(skb); |
f5646501 FL |
114 | if (!sk || !sk_fullsock(sk) || |
115 | !net_eq(nft_net(pkt), sock_net(sk))) | |
96518518 PM |
116 | goto err; |
117 | ||
3aed8225 ED |
118 | read_lock_bh(&sk->sk_callback_lock); |
119 | if (sk->sk_socket == NULL || | |
120 | sk->sk_socket->file == NULL) { | |
121 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
122 | goto err; |
123 | } | |
124 | ||
fad136ea | 125 | *dest = from_kuid_munged(&init_user_ns, |
3aed8225 ED |
126 | sk->sk_socket->file->f_cred->fsuid); |
127 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
128 | break; |
129 | case NFT_META_SKGID: | |
3aed8225 | 130 | sk = skb_to_full_sk(skb); |
f5646501 FL |
131 | if (!sk || !sk_fullsock(sk) || |
132 | !net_eq(nft_net(pkt), sock_net(sk))) | |
96518518 PM |
133 | goto err; |
134 | ||
3aed8225 ED |
135 | read_lock_bh(&sk->sk_callback_lock); |
136 | if (sk->sk_socket == NULL || | |
137 | sk->sk_socket->file == NULL) { | |
138 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
139 | goto err; |
140 | } | |
fad136ea | 141 | *dest = from_kgid_munged(&init_user_ns, |
3aed8225 ED |
142 | sk->sk_socket->file->f_cred->fsgid); |
143 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 | 144 | break; |
06efbd6d | 145 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
146 | case NFT_META_RTCLASSID: { |
147 | const struct dst_entry *dst = skb_dst(skb); | |
148 | ||
149 | if (dst == NULL) | |
150 | goto err; | |
fad136ea | 151 | *dest = dst->tclassid; |
96518518 PM |
152 | break; |
153 | } | |
154 | #endif | |
155 | #ifdef CONFIG_NETWORK_SECMARK | |
156 | case NFT_META_SECMARK: | |
fad136ea | 157 | *dest = skb->secmark; |
96518518 PM |
158 | break; |
159 | #endif | |
e2a093ff AR |
160 | case NFT_META_PKTTYPE: |
161 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
10596608 | 162 | nft_reg_store8(dest, skb->pkt_type); |
e2a093ff AR |
163 | break; |
164 | } | |
165 | ||
0e5a1c7e | 166 | switch (nft_pf(pkt)) { |
e2a093ff AR |
167 | case NFPROTO_IPV4: |
168 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
10596608 | 169 | nft_reg_store8(dest, PACKET_MULTICAST); |
e2a093ff | 170 | else |
10596608 | 171 | nft_reg_store8(dest, PACKET_BROADCAST); |
e2a093ff AR |
172 | break; |
173 | case NFPROTO_IPV6: | |
10596608 | 174 | nft_reg_store8(dest, PACKET_MULTICAST); |
e2a093ff | 175 | break; |
f169fd69 LZ |
176 | case NFPROTO_NETDEV: |
177 | switch (skb->protocol) { | |
178 | case htons(ETH_P_IP): { | |
179 | int noff = skb_network_offset(skb); | |
180 | struct iphdr *iph, _iph; | |
181 | ||
182 | iph = skb_header_pointer(skb, noff, | |
183 | sizeof(_iph), &_iph); | |
184 | if (!iph) | |
185 | goto err; | |
186 | ||
187 | if (ipv4_is_multicast(iph->daddr)) | |
10596608 | 188 | nft_reg_store8(dest, PACKET_MULTICAST); |
f169fd69 | 189 | else |
10596608 | 190 | nft_reg_store8(dest, PACKET_BROADCAST); |
f169fd69 LZ |
191 | |
192 | break; | |
193 | } | |
194 | case htons(ETH_P_IPV6): | |
10596608 | 195 | nft_reg_store8(dest, PACKET_MULTICAST); |
f169fd69 LZ |
196 | break; |
197 | default: | |
198 | WARN_ON_ONCE(1); | |
199 | goto err; | |
200 | } | |
201 | break; | |
e2a093ff | 202 | default: |
f169fd69 | 203 | WARN_ON_ONCE(1); |
e2a093ff AR |
204 | goto err; |
205 | } | |
206 | break; | |
afc5be30 | 207 | case NFT_META_CPU: |
fad136ea | 208 | *dest = raw_smp_processor_id(); |
afc5be30 | 209 | break; |
3045d760 AR |
210 | case NFT_META_IIFGROUP: |
211 | if (in == NULL) | |
212 | goto err; | |
fad136ea | 213 | *dest = in->group; |
3045d760 AR |
214 | break; |
215 | case NFT_META_OIFGROUP: | |
216 | if (out == NULL) | |
217 | goto err; | |
fad136ea | 218 | *dest = out->group; |
3045d760 | 219 | break; |
e181a543 | 220 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 221 | case NFT_META_CGROUP: |
3aed8225 | 222 | sk = skb_to_full_sk(skb); |
f5646501 FL |
223 | if (!sk || !sk_fullsock(sk) || |
224 | !net_eq(nft_net(pkt), sock_net(sk))) | |
c5035c77 | 225 | goto err; |
2a56a1fe | 226 | *dest = sock_cgroup_classid(&sk->sk_cgrp_data); |
ce674173 | 227 | break; |
e181a543 | 228 | #endif |
b07edbe1 FW |
229 | case NFT_META_PRANDOM: { |
230 | struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); | |
231 | *dest = prandom_u32_state(state); | |
232 | break; | |
233 | } | |
f6931f5f FW |
234 | #ifdef CONFIG_XFRM |
235 | case NFT_META_SECPATH: | |
7af8f4ca | 236 | nft_reg_store8(dest, secpath_exists(skb)); |
f6931f5f FW |
237 | break; |
238 | #endif | |
0fb4d219 | 239 | case NFT_META_IIFKIND: |
240 | if (in == NULL || in->rtnl_link_ops == NULL) | |
241 | goto err; | |
242 | strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ); | |
243 | break; | |
244 | case NFT_META_OIFKIND: | |
245 | if (out == NULL || out->rtnl_link_ops == NULL) | |
246 | goto err; | |
247 | strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ); | |
248 | break; | |
63d10e12 AJ |
249 | case NFT_META_TIME_NS: |
250 | nft_reg_store64(dest, ktime_get_real_ns()); | |
251 | break; | |
252 | case NFT_META_TIME_DAY: | |
253 | nft_reg_store8(dest, nft_meta_weekday(get_seconds())); | |
254 | break; | |
255 | case NFT_META_TIME_HOUR: | |
256 | *dest = nft_meta_hour(get_seconds()); | |
257 | break; | |
96518518 PM |
258 | default: |
259 | WARN_ON(1); | |
260 | goto err; | |
261 | } | |
262 | return; | |
263 | ||
264 | err: | |
a55e22e9 | 265 | regs->verdict.code = NFT_BREAK; |
96518518 | 266 | } |
30e103fe | 267 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
96518518 | 268 | |
30e103fe | 269 | void nft_meta_set_eval(const struct nft_expr *expr, |
270 | struct nft_regs *regs, | |
271 | const struct nft_pktinfo *pkt) | |
e035b77a ABG |
272 | { |
273 | const struct nft_meta *meta = nft_expr_priv(expr); | |
274 | struct sk_buff *skb = pkt->skb; | |
10596608 LZ |
275 | u32 *sreg = ®s->data[meta->sreg]; |
276 | u32 value = *sreg; | |
97a0549b | 277 | u8 value8; |
e035b77a ABG |
278 | |
279 | switch (meta->key) { | |
280 | case NFT_META_MARK: | |
281 | skb->mark = value; | |
282 | break; | |
283 | case NFT_META_PRIORITY: | |
284 | skb->priority = value; | |
285 | break; | |
b4aae759 | 286 | case NFT_META_PKTTYPE: |
97a0549b | 287 | value8 = nft_reg_load8(sreg); |
10596608 | 288 | |
97a0549b TY |
289 | if (skb->pkt_type != value8 && |
290 | skb_pkt_type_ok(value8) && | |
10596608 | 291 | skb_pkt_type_ok(skb->pkt_type)) |
97a0549b | 292 | skb->pkt_type = value8; |
b4aae759 | 293 | break; |
e035b77a | 294 | case NFT_META_NFTRACE: |
97a0549b TY |
295 | value8 = nft_reg_load8(sreg); |
296 | ||
297 | skb->nf_trace = !!value8; | |
e035b77a | 298 | break; |
b473a1f5 CG |
299 | #ifdef CONFIG_NETWORK_SECMARK |
300 | case NFT_META_SECMARK: | |
301 | skb->secmark = value; | |
302 | break; | |
303 | #endif | |
e035b77a ABG |
304 | default: |
305 | WARN_ON(1); | |
306 | } | |
307 | } | |
30e103fe | 308 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
e035b77a | 309 | |
30e103fe | 310 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
96518518 PM |
311 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
312 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
e035b77a | 313 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
96518518 | 314 | }; |
30e103fe | 315 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
96518518 | 316 | |
30e103fe | 317 | int nft_meta_get_init(const struct nft_ctx *ctx, |
318 | const struct nft_expr *expr, | |
319 | const struct nlattr * const tb[]) | |
96518518 | 320 | { |
d2caa696 | 321 | struct nft_meta *priv = nft_expr_priv(expr); |
45d9bcda | 322 | unsigned int len; |
96518518 | 323 | |
d2caa696 PM |
324 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
325 | switch (priv->key) { | |
96518518 | 326 | case NFT_META_PROTOCOL: |
45d9bcda PM |
327 | case NFT_META_IIFTYPE: |
328 | case NFT_META_OIFTYPE: | |
329 | len = sizeof(u16); | |
330 | break; | |
124edfa9 | 331 | case NFT_META_NFPROTO: |
4566bf27 | 332 | case NFT_META_L4PROTO: |
45d9bcda | 333 | case NFT_META_LEN: |
96518518 PM |
334 | case NFT_META_PRIORITY: |
335 | case NFT_META_MARK: | |
336 | case NFT_META_IIF: | |
337 | case NFT_META_OIF: | |
96518518 PM |
338 | case NFT_META_SKUID: |
339 | case NFT_META_SKGID: | |
06efbd6d | 340 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
341 | case NFT_META_RTCLASSID: |
342 | #endif | |
343 | #ifdef CONFIG_NETWORK_SECMARK | |
344 | case NFT_META_SECMARK: | |
345 | #endif | |
e2a093ff | 346 | case NFT_META_PKTTYPE: |
afc5be30 | 347 | case NFT_META_CPU: |
3045d760 AR |
348 | case NFT_META_IIFGROUP: |
349 | case NFT_META_OIFGROUP: | |
e181a543 | 350 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 351 | case NFT_META_CGROUP: |
e181a543 | 352 | #endif |
45d9bcda PM |
353 | len = sizeof(u32); |
354 | break; | |
355 | case NFT_META_IIFNAME: | |
356 | case NFT_META_OIFNAME: | |
0fb4d219 | 357 | case NFT_META_IIFKIND: |
358 | case NFT_META_OIFKIND: | |
45d9bcda | 359 | len = IFNAMSIZ; |
d2caa696 | 360 | break; |
b07edbe1 FW |
361 | case NFT_META_PRANDOM: |
362 | prandom_init_once(&nft_prandom_state); | |
363 | len = sizeof(u32); | |
364 | break; | |
f6931f5f FW |
365 | #ifdef CONFIG_XFRM |
366 | case NFT_META_SECPATH: | |
367 | len = sizeof(u8); | |
368 | break; | |
369 | #endif | |
63d10e12 AJ |
370 | case NFT_META_TIME_NS: |
371 | len = sizeof(u64); | |
372 | break; | |
373 | case NFT_META_TIME_DAY: | |
374 | len = sizeof(u8); | |
375 | break; | |
376 | case NFT_META_TIME_HOUR: | |
377 | len = sizeof(u32); | |
378 | break; | |
96518518 PM |
379 | default: |
380 | return -EOPNOTSUPP; | |
381 | } | |
382 | ||
b1c96ed3 | 383 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
27e6d201 PM |
384 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
385 | NFT_DATA_VALUE, len); | |
e035b77a | 386 | } |
30e103fe | 387 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
e035b77a | 388 | |
f6931f5f FW |
389 | static int nft_meta_get_validate(const struct nft_ctx *ctx, |
390 | const struct nft_expr *expr, | |
391 | const struct nft_data **data) | |
392 | { | |
393 | #ifdef CONFIG_XFRM | |
394 | const struct nft_meta *priv = nft_expr_priv(expr); | |
395 | unsigned int hooks; | |
396 | ||
397 | if (priv->key != NFT_META_SECPATH) | |
398 | return 0; | |
399 | ||
36596dad | 400 | switch (ctx->family) { |
f6931f5f FW |
401 | case NFPROTO_NETDEV: |
402 | hooks = 1 << NF_NETDEV_INGRESS; | |
403 | break; | |
404 | case NFPROTO_IPV4: | |
405 | case NFPROTO_IPV6: | |
406 | case NFPROTO_INET: | |
407 | hooks = (1 << NF_INET_PRE_ROUTING) | | |
408 | (1 << NF_INET_LOCAL_IN) | | |
409 | (1 << NF_INET_FORWARD); | |
410 | break; | |
411 | default: | |
412 | return -EOPNOTSUPP; | |
413 | } | |
414 | ||
415 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
416 | #else | |
417 | return 0; | |
418 | #endif | |
419 | } | |
420 | ||
30e103fe | 421 | int nft_meta_set_validate(const struct nft_ctx *ctx, |
422 | const struct nft_expr *expr, | |
423 | const struct nft_data **data) | |
b4aae759 | 424 | { |
960fa72f | 425 | struct nft_meta *priv = nft_expr_priv(expr); |
b4aae759 FW |
426 | unsigned int hooks; |
427 | ||
960fa72f LZ |
428 | if (priv->key != NFT_META_PKTTYPE) |
429 | return 0; | |
430 | ||
36596dad | 431 | switch (ctx->family) { |
b4aae759 FW |
432 | case NFPROTO_BRIDGE: |
433 | hooks = 1 << NF_BR_PRE_ROUTING; | |
434 | break; | |
435 | case NFPROTO_NETDEV: | |
436 | hooks = 1 << NF_NETDEV_INGRESS; | |
437 | break; | |
96d9f2a7 LZ |
438 | case NFPROTO_IPV4: |
439 | case NFPROTO_IPV6: | |
440 | case NFPROTO_INET: | |
441 | hooks = 1 << NF_INET_PRE_ROUTING; | |
442 | break; | |
b4aae759 FW |
443 | default: |
444 | return -EOPNOTSUPP; | |
445 | } | |
446 | ||
447 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
448 | } | |
30e103fe | 449 | EXPORT_SYMBOL_GPL(nft_meta_set_validate); |
b4aae759 | 450 | |
30e103fe | 451 | int nft_meta_set_init(const struct nft_ctx *ctx, |
452 | const struct nft_expr *expr, | |
453 | const struct nlattr * const tb[]) | |
e035b77a ABG |
454 | { |
455 | struct nft_meta *priv = nft_expr_priv(expr); | |
d07db988 | 456 | unsigned int len; |
e035b77a ABG |
457 | int err; |
458 | ||
459 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
d2caa696 PM |
460 | switch (priv->key) { |
461 | case NFT_META_MARK: | |
462 | case NFT_META_PRIORITY: | |
b473a1f5 CG |
463 | #ifdef CONFIG_NETWORK_SECMARK |
464 | case NFT_META_SECMARK: | |
465 | #endif | |
d07db988 PM |
466 | len = sizeof(u32); |
467 | break; | |
d2caa696 | 468 | case NFT_META_NFTRACE: |
d07db988 | 469 | len = sizeof(u8); |
d2caa696 | 470 | break; |
b4aae759 | 471 | case NFT_META_PKTTYPE: |
b4aae759 FW |
472 | len = sizeof(u8); |
473 | break; | |
d2caa696 PM |
474 | default: |
475 | return -EOPNOTSUPP; | |
e035b77a ABG |
476 | } |
477 | ||
b1c96ed3 | 478 | priv->sreg = nft_parse_register(tb[NFTA_META_SREG]); |
d07db988 | 479 | err = nft_validate_register_load(priv->sreg, len); |
b38895c5 PNA |
480 | if (err < 0) |
481 | return err; | |
e035b77a | 482 | |
e639f7ab FW |
483 | if (priv->key == NFT_META_NFTRACE) |
484 | static_branch_inc(&nft_trace_enabled); | |
485 | ||
e035b77a | 486 | return 0; |
96518518 | 487 | } |
30e103fe | 488 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
96518518 | 489 | |
30e103fe | 490 | int nft_meta_get_dump(struct sk_buff *skb, |
491 | const struct nft_expr *expr) | |
96518518 PM |
492 | { |
493 | const struct nft_meta *priv = nft_expr_priv(expr); | |
494 | ||
e035b77a ABG |
495 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
496 | goto nla_put_failure; | |
b1c96ed3 | 497 | if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) |
96518518 | 498 | goto nla_put_failure; |
e035b77a ABG |
499 | return 0; |
500 | ||
501 | nla_put_failure: | |
502 | return -1; | |
503 | } | |
30e103fe | 504 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
e035b77a | 505 | |
30e103fe | 506 | int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr) |
e035b77a ABG |
507 | { |
508 | const struct nft_meta *priv = nft_expr_priv(expr); | |
509 | ||
96518518 PM |
510 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
511 | goto nla_put_failure; | |
b1c96ed3 | 512 | if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) |
e035b77a ABG |
513 | goto nla_put_failure; |
514 | ||
96518518 PM |
515 | return 0; |
516 | ||
517 | nla_put_failure: | |
518 | return -1; | |
519 | } | |
30e103fe | 520 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
96518518 | 521 | |
30e103fe | 522 | void nft_meta_set_destroy(const struct nft_ctx *ctx, |
523 | const struct nft_expr *expr) | |
e639f7ab FW |
524 | { |
525 | const struct nft_meta *priv = nft_expr_priv(expr); | |
526 | ||
527 | if (priv->key == NFT_META_NFTRACE) | |
528 | static_branch_dec(&nft_trace_enabled); | |
529 | } | |
30e103fe | 530 | EXPORT_SYMBOL_GPL(nft_meta_set_destroy); |
e639f7ab | 531 | |
c9626a2c PNA |
532 | static int nft_meta_get_offload(struct nft_offload_ctx *ctx, |
533 | struct nft_flow_rule *flow, | |
534 | const struct nft_expr *expr) | |
535 | { | |
536 | const struct nft_meta *priv = nft_expr_priv(expr); | |
537 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
538 | ||
539 | switch (priv->key) { | |
540 | case NFT_META_PROTOCOL: | |
541 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto, | |
542 | sizeof(__u16), reg); | |
543 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); | |
544 | break; | |
545 | case NFT_META_L4PROTO: | |
546 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, | |
547 | sizeof(__u8), reg); | |
548 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); | |
549 | break; | |
550 | default: | |
551 | return -EOPNOTSUPP; | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
e035b77a | 557 | static const struct nft_expr_ops nft_meta_get_ops = { |
ef1f7df9 | 558 | .type = &nft_meta_type, |
96518518 | 559 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
e035b77a | 560 | .eval = nft_meta_get_eval, |
d2caa696 | 561 | .init = nft_meta_get_init, |
e035b77a | 562 | .dump = nft_meta_get_dump, |
f6931f5f | 563 | .validate = nft_meta_get_validate, |
c9626a2c | 564 | .offload = nft_meta_get_offload, |
ef1f7df9 PM |
565 | }; |
566 | ||
e035b77a ABG |
567 | static const struct nft_expr_ops nft_meta_set_ops = { |
568 | .type = &nft_meta_type, | |
569 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
570 | .eval = nft_meta_set_eval, | |
d2caa696 | 571 | .init = nft_meta_set_init, |
e639f7ab | 572 | .destroy = nft_meta_set_destroy, |
e035b77a | 573 | .dump = nft_meta_set_dump, |
960fa72f | 574 | .validate = nft_meta_set_validate, |
e035b77a ABG |
575 | }; |
576 | ||
577 | static const struct nft_expr_ops * | |
578 | nft_meta_select_ops(const struct nft_ctx *ctx, | |
579 | const struct nlattr * const tb[]) | |
580 | { | |
581 | if (tb[NFTA_META_KEY] == NULL) | |
582 | return ERR_PTR(-EINVAL); | |
583 | ||
584 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
585 | return ERR_PTR(-EINVAL); | |
586 | ||
dfee0e99 | 587 | #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META) |
0ef1efd1 PNA |
588 | if (ctx->family == NFPROTO_BRIDGE) |
589 | return ERR_PTR(-EAGAIN); | |
590 | #endif | |
e035b77a ABG |
591 | if (tb[NFTA_META_DREG]) |
592 | return &nft_meta_get_ops; | |
593 | ||
594 | if (tb[NFTA_META_SREG]) | |
595 | return &nft_meta_set_ops; | |
596 | ||
597 | return ERR_PTR(-EINVAL); | |
598 | } | |
599 | ||
8a22543c | 600 | struct nft_expr_type nft_meta_type __read_mostly = { |
ef1f7df9 | 601 | .name = "meta", |
d4ef3835 | 602 | .select_ops = nft_meta_select_ops, |
96518518 PM |
603 | .policy = nft_meta_policy, |
604 | .maxattr = NFTA_META_MAX, | |
ef1f7df9 | 605 | .owner = THIS_MODULE, |
96518518 | 606 | }; |
fb961945 CG |
607 | |
608 | #ifdef CONFIG_NETWORK_SECMARK | |
609 | struct nft_secmark { | |
610 | u32 secid; | |
611 | char *ctx; | |
612 | }; | |
613 | ||
614 | static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = { | |
615 | [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN }, | |
616 | }; | |
617 | ||
618 | static int nft_secmark_compute_secid(struct nft_secmark *priv) | |
619 | { | |
620 | u32 tmp_secid = 0; | |
621 | int err; | |
622 | ||
623 | err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid); | |
624 | if (err) | |
625 | return err; | |
626 | ||
627 | if (!tmp_secid) | |
628 | return -ENOENT; | |
629 | ||
630 | err = security_secmark_relabel_packet(tmp_secid); | |
631 | if (err) | |
632 | return err; | |
633 | ||
634 | priv->secid = tmp_secid; | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs, | |
639 | const struct nft_pktinfo *pkt) | |
640 | { | |
641 | const struct nft_secmark *priv = nft_obj_data(obj); | |
642 | struct sk_buff *skb = pkt->skb; | |
643 | ||
644 | skb->secmark = priv->secid; | |
645 | } | |
646 | ||
647 | static int nft_secmark_obj_init(const struct nft_ctx *ctx, | |
648 | const struct nlattr * const tb[], | |
649 | struct nft_object *obj) | |
650 | { | |
651 | struct nft_secmark *priv = nft_obj_data(obj); | |
652 | int err; | |
653 | ||
654 | if (tb[NFTA_SECMARK_CTX] == NULL) | |
655 | return -EINVAL; | |
656 | ||
657 | priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL); | |
658 | if (!priv->ctx) | |
659 | return -ENOMEM; | |
660 | ||
661 | err = nft_secmark_compute_secid(priv); | |
662 | if (err) { | |
663 | kfree(priv->ctx); | |
664 | return err; | |
665 | } | |
666 | ||
667 | security_secmark_refcount_inc(); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj, | |
673 | bool reset) | |
674 | { | |
675 | struct nft_secmark *priv = nft_obj_data(obj); | |
676 | int err; | |
677 | ||
678 | if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx)) | |
679 | return -1; | |
680 | ||
681 | if (reset) { | |
682 | err = nft_secmark_compute_secid(priv); | |
683 | if (err) | |
684 | return err; | |
685 | } | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) | |
691 | { | |
692 | struct nft_secmark *priv = nft_obj_data(obj); | |
693 | ||
694 | security_secmark_refcount_dec(); | |
695 | ||
696 | kfree(priv->ctx); | |
697 | } | |
698 | ||
699 | static const struct nft_object_ops nft_secmark_obj_ops = { | |
700 | .type = &nft_secmark_obj_type, | |
701 | .size = sizeof(struct nft_secmark), | |
702 | .init = nft_secmark_obj_init, | |
703 | .eval = nft_secmark_obj_eval, | |
704 | .dump = nft_secmark_obj_dump, | |
705 | .destroy = nft_secmark_obj_destroy, | |
706 | }; | |
707 | struct nft_object_type nft_secmark_obj_type __read_mostly = { | |
708 | .type = NFT_OBJECT_SECMARK, | |
709 | .ops = &nft_secmark_obj_ops, | |
710 | .maxattr = NFTA_SECMARK_MAX, | |
711 | .policy = nft_secmark_policy, | |
712 | .owner = THIS_MODULE, | |
713 | }; | |
714 | #endif /* CONFIG_NETWORK_SECMARK */ |