1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/seqlock.h>
6 #include <linux/netlink.h>
7 #include <linux/netfilter.h>
8 #include <linux/netfilter/nf_tables.h>
9 #include <net/netfilter/nf_tables.h>
10 #include <net/dst_metadata.h>
11 #include <net/ip_tunnels.h>
12 #include <net/vxlan.h>
13 #include <net/erspan.h>
14 #include <net/geneve.h>
15
16 struct nft_tunnel {
17 enum nft_tunnel_keys key:8;
18 u8 dreg;
19 enum nft_tunnel_mode mode:8;
20 u8 len;
21 };
22
nft_tunnel_get_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)23 static void nft_tunnel_get_eval(const struct nft_expr *expr,
24 struct nft_regs *regs,
25 const struct nft_pktinfo *pkt)
26 {
27 const struct nft_tunnel *priv = nft_expr_priv(expr);
28 u32 *dest = ®s->data[priv->dreg];
29 struct ip_tunnel_info *tun_info;
30
31 tun_info = skb_tunnel_info(pkt->skb);
32
33 switch (priv->key) {
34 case NFT_TUNNEL_PATH:
35 if (!tun_info) {
36 nft_reg_store8(dest, false);
37 return;
38 }
39 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
40 (priv->mode == NFT_TUNNEL_MODE_RX &&
41 !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
42 (priv->mode == NFT_TUNNEL_MODE_TX &&
43 (tun_info->mode & IP_TUNNEL_INFO_TX)))
44 nft_reg_store8(dest, true);
45 else
46 nft_reg_store8(dest, false);
47 break;
48 case NFT_TUNNEL_ID:
49 if (!tun_info) {
50 regs->verdict.code = NFT_BREAK;
51 return;
52 }
53 if (priv->mode == NFT_TUNNEL_MODE_NONE ||
54 (priv->mode == NFT_TUNNEL_MODE_RX &&
55 !(tun_info->mode & IP_TUNNEL_INFO_TX)) ||
56 (priv->mode == NFT_TUNNEL_MODE_TX &&
57 (tun_info->mode & IP_TUNNEL_INFO_TX)))
58 *dest = ntohl(tunnel_id_to_key32(tun_info->key.tun_id));
59 else
60 regs->verdict.code = NFT_BREAK;
61 break;
62 default:
63 WARN_ON(1);
64 regs->verdict.code = NFT_BREAK;
65 }
66 }
67
68 static const struct nla_policy nft_tunnel_policy[NFTA_TUNNEL_MAX + 1] = {
69 [NFTA_TUNNEL_KEY] = NLA_POLICY_MAX(NLA_BE32, 255),
70 [NFTA_TUNNEL_DREG] = { .type = NLA_U32 },
71 [NFTA_TUNNEL_MODE] = NLA_POLICY_MAX(NLA_BE32, 255),
72 };
73
nft_tunnel_get_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])74 static int nft_tunnel_get_init(const struct nft_ctx *ctx,
75 const struct nft_expr *expr,
76 const struct nlattr * const tb[])
77 {
78 struct nft_tunnel *priv = nft_expr_priv(expr);
79 u32 len;
80
81 if (!tb[NFTA_TUNNEL_KEY] ||
82 !tb[NFTA_TUNNEL_DREG])
83 return -EINVAL;
84
85 priv->key = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY]));
86 switch (priv->key) {
87 case NFT_TUNNEL_PATH:
88 len = sizeof(u8);
89 break;
90 case NFT_TUNNEL_ID:
91 len = sizeof(u32);
92 break;
93 default:
94 return -EOPNOTSUPP;
95 }
96
97 if (tb[NFTA_TUNNEL_MODE]) {
98 priv->mode = ntohl(nla_get_be32(tb[NFTA_TUNNEL_MODE]));
99 if (priv->mode > NFT_TUNNEL_MODE_MAX)
100 return -EOPNOTSUPP;
101 } else {
102 priv->mode = NFT_TUNNEL_MODE_NONE;
103 }
104
105 priv->len = len;
106 return nft_parse_register_store(ctx, tb[NFTA_TUNNEL_DREG], &priv->dreg,
107 NULL, NFT_DATA_VALUE, len);
108 }
109
nft_tunnel_get_dump(struct sk_buff * skb,const struct nft_expr * expr,bool reset)110 static int nft_tunnel_get_dump(struct sk_buff *skb,
111 const struct nft_expr *expr, bool reset)
112 {
113 const struct nft_tunnel *priv = nft_expr_priv(expr);
114
115 if (nla_put_be32(skb, NFTA_TUNNEL_KEY, htonl(priv->key)))
116 goto nla_put_failure;
117 if (nft_dump_register(skb, NFTA_TUNNEL_DREG, priv->dreg))
118 goto nla_put_failure;
119 if (nla_put_be32(skb, NFTA_TUNNEL_MODE, htonl(priv->mode)))
120 goto nla_put_failure;
121 return 0;
122
123 nla_put_failure:
124 return -1;
125 }
126
nft_tunnel_get_reduce(struct nft_regs_track * track,const struct nft_expr * expr)127 static bool nft_tunnel_get_reduce(struct nft_regs_track *track,
128 const struct nft_expr *expr)
129 {
130 const struct nft_tunnel *priv = nft_expr_priv(expr);
131 const struct nft_tunnel *tunnel;
132
133 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
134 nft_reg_track_update(track, expr, priv->dreg, priv->len);
135 return false;
136 }
137
138 tunnel = nft_expr_priv(track->regs[priv->dreg].selector);
139 if (priv->key != tunnel->key ||
140 priv->dreg != tunnel->dreg ||
141 priv->mode != tunnel->mode) {
142 nft_reg_track_update(track, expr, priv->dreg, priv->len);
143 return false;
144 }
145
146 if (!track->regs[priv->dreg].bitwise)
147 return true;
148
149 return false;
150 }
151
152 static struct nft_expr_type nft_tunnel_type;
153 static const struct nft_expr_ops nft_tunnel_get_ops = {
154 .type = &nft_tunnel_type,
155 .size = NFT_EXPR_SIZE(sizeof(struct nft_tunnel)),
156 .eval = nft_tunnel_get_eval,
157 .init = nft_tunnel_get_init,
158 .dump = nft_tunnel_get_dump,
159 .reduce = nft_tunnel_get_reduce,
160 };
161
162 static struct nft_expr_type nft_tunnel_type __read_mostly = {
163 .name = "tunnel",
164 .family = NFPROTO_NETDEV,
165 .ops = &nft_tunnel_get_ops,
166 .policy = nft_tunnel_policy,
167 .maxattr = NFTA_TUNNEL_MAX,
168 .owner = THIS_MODULE,
169 };
170
171 struct nft_tunnel_opts {
172 union {
173 struct vxlan_metadata vxlan;
174 struct erspan_metadata erspan;
175 u8 data[IP_TUNNEL_OPTS_MAX];
176 } u;
177 IP_TUNNEL_DECLARE_FLAGS(flags);
178 u32 len;
179 };
180
181 struct nft_tunnel_obj {
182 struct metadata_dst *md;
183 struct nft_tunnel_opts opts;
184 };
185
186 static const struct nla_policy nft_tunnel_ip_policy[NFTA_TUNNEL_KEY_IP_MAX + 1] = {
187 [NFTA_TUNNEL_KEY_IP_SRC] = { .type = NLA_U32 },
188 [NFTA_TUNNEL_KEY_IP_DST] = { .type = NLA_U32 },
189 };
190
nft_tunnel_obj_ip_init(const struct nft_ctx * ctx,const struct nlattr * attr,struct ip_tunnel_info * info)191 static int nft_tunnel_obj_ip_init(const struct nft_ctx *ctx,
192 const struct nlattr *attr,
193 struct ip_tunnel_info *info)
194 {
195 struct nlattr *tb[NFTA_TUNNEL_KEY_IP_MAX + 1];
196 int err;
197
198 err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP_MAX, attr,
199 nft_tunnel_ip_policy, NULL);
200 if (err < 0)
201 return err;
202
203 if (!tb[NFTA_TUNNEL_KEY_IP_DST])
204 return -EINVAL;
205
206 if (tb[NFTA_TUNNEL_KEY_IP_SRC])
207 info->key.u.ipv4.src = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_SRC]);
208 if (tb[NFTA_TUNNEL_KEY_IP_DST])
209 info->key.u.ipv4.dst = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP_DST]);
210
211 return 0;
212 }
213
214 static const struct nla_policy nft_tunnel_ip6_policy[NFTA_TUNNEL_KEY_IP6_MAX + 1] = {
215 [NFTA_TUNNEL_KEY_IP6_SRC] = { .len = sizeof(struct in6_addr), },
216 [NFTA_TUNNEL_KEY_IP6_DST] = { .len = sizeof(struct in6_addr), },
217 [NFTA_TUNNEL_KEY_IP6_FLOWLABEL] = { .type = NLA_U32, }
218 };
219
nft_tunnel_obj_ip6_init(const struct nft_ctx * ctx,const struct nlattr * attr,struct ip_tunnel_info * info)220 static int nft_tunnel_obj_ip6_init(const struct nft_ctx *ctx,
221 const struct nlattr *attr,
222 struct ip_tunnel_info *info)
223 {
224 struct nlattr *tb[NFTA_TUNNEL_KEY_IP6_MAX + 1];
225 int err;
226
227 err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_IP6_MAX, attr,
228 nft_tunnel_ip6_policy, NULL);
229 if (err < 0)
230 return err;
231
232 if (!tb[NFTA_TUNNEL_KEY_IP6_DST])
233 return -EINVAL;
234
235 if (tb[NFTA_TUNNEL_KEY_IP6_SRC]) {
236 memcpy(&info->key.u.ipv6.src,
237 nla_data(tb[NFTA_TUNNEL_KEY_IP6_SRC]),
238 sizeof(struct in6_addr));
239 }
240 if (tb[NFTA_TUNNEL_KEY_IP6_DST]) {
241 memcpy(&info->key.u.ipv6.dst,
242 nla_data(tb[NFTA_TUNNEL_KEY_IP6_DST]),
243 sizeof(struct in6_addr));
244 }
245 if (tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL])
246 info->key.label = nla_get_be32(tb[NFTA_TUNNEL_KEY_IP6_FLOWLABEL]);
247
248 info->mode |= IP_TUNNEL_INFO_IPV6;
249
250 return 0;
251 }
252
253 static const struct nla_policy nft_tunnel_opts_vxlan_policy[NFTA_TUNNEL_KEY_VXLAN_MAX + 1] = {
254 [NFTA_TUNNEL_KEY_VXLAN_GBP] = { .type = NLA_U32 },
255 };
256
nft_tunnel_obj_vxlan_init(const struct nlattr * attr,struct nft_tunnel_opts * opts)257 static int nft_tunnel_obj_vxlan_init(const struct nlattr *attr,
258 struct nft_tunnel_opts *opts)
259 {
260 struct nlattr *tb[NFTA_TUNNEL_KEY_VXLAN_MAX + 1];
261 int err;
262
263 err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_VXLAN_MAX, attr,
264 nft_tunnel_opts_vxlan_policy, NULL);
265 if (err < 0)
266 return err;
267
268 if (!tb[NFTA_TUNNEL_KEY_VXLAN_GBP])
269 return -EINVAL;
270
271 opts->u.vxlan.gbp = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_VXLAN_GBP]));
272
273 opts->len = sizeof(struct vxlan_metadata);
274 ip_tunnel_flags_zero(opts->flags);
275 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, opts->flags);
276
277 return 0;
278 }
279
280 static const struct nla_policy nft_tunnel_opts_erspan_policy[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1] = {
281 [NFTA_TUNNEL_KEY_ERSPAN_VERSION] = { .type = NLA_U32 },
282 [NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX] = { .type = NLA_U32 },
283 [NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] = { .type = NLA_U8 },
284 [NFTA_TUNNEL_KEY_ERSPAN_V2_HWID] = { .type = NLA_U8 },
285 };
286
nft_tunnel_obj_erspan_init(const struct nlattr * attr,struct nft_tunnel_opts * opts)287 static int nft_tunnel_obj_erspan_init(const struct nlattr *attr,
288 struct nft_tunnel_opts *opts)
289 {
290 struct nlattr *tb[NFTA_TUNNEL_KEY_ERSPAN_MAX + 1];
291 uint8_t hwid, dir;
292 int err, version;
293
294 err = nla_parse_nested_deprecated(tb, NFTA_TUNNEL_KEY_ERSPAN_MAX,
295 attr, nft_tunnel_opts_erspan_policy,
296 NULL);
297 if (err < 0)
298 return err;
299
300 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION])
301 return -EINVAL;
302
303 version = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_VERSION]));
304 switch (version) {
305 case ERSPAN_VERSION:
306 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX])
307 return -EINVAL;
308
309 opts->u.erspan.u.index =
310 nla_get_be32(tb[NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX]);
311 break;
312 case ERSPAN_VERSION2:
313 if (!tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR] ||
314 !tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID])
315 return -EINVAL;
316
317 hwid = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_HWID]);
318 dir = nla_get_u8(tb[NFTA_TUNNEL_KEY_ERSPAN_V2_DIR]);
319
320 set_hwid(&opts->u.erspan.u.md2, hwid);
321 opts->u.erspan.u.md2.dir = dir;
322 break;
323 default:
324 return -EOPNOTSUPP;
325 }
326 opts->u.erspan.version = version;
327
328 opts->len = sizeof(struct erspan_metadata);
329 ip_tunnel_flags_zero(opts->flags);
330 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, opts->flags);
331
332 return 0;
333 }
334
335 static const struct nla_policy nft_tunnel_opts_geneve_policy[NFTA_TUNNEL_KEY_GENEVE_MAX + 1] = {
336 [NFTA_TUNNEL_KEY_GENEVE_CLASS] = { .type = NLA_U16 },
337 [NFTA_TUNNEL_KEY_GENEVE_TYPE] = { .type = NLA_U8 },
338 [NFTA_TUNNEL_KEY_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 },
339 };
340
nft_tunnel_obj_geneve_init(const struct nlattr * attr,struct nft_tunnel_opts * opts)341 static int nft_tunnel_obj_geneve_init(const struct nlattr *attr,
342 struct nft_tunnel_opts *opts)
343 {
344 struct geneve_opt *opt = (struct geneve_opt *)opts->u.data + opts->len;
345 struct nlattr *tb[NFTA_TUNNEL_KEY_GENEVE_MAX + 1];
346 int err, data_len;
347
348 err = nla_parse_nested(tb, NFTA_TUNNEL_KEY_GENEVE_MAX, attr,
349 nft_tunnel_opts_geneve_policy, NULL);
350 if (err < 0)
351 return err;
352
353 if (!tb[NFTA_TUNNEL_KEY_GENEVE_CLASS] ||
354 !tb[NFTA_TUNNEL_KEY_GENEVE_TYPE] ||
355 !tb[NFTA_TUNNEL_KEY_GENEVE_DATA])
356 return -EINVAL;
357
358 attr = tb[NFTA_TUNNEL_KEY_GENEVE_DATA];
359 data_len = nla_len(attr);
360 if (data_len % 4)
361 return -EINVAL;
362
363 opts->len += sizeof(*opt) + data_len;
364 if (opts->len > IP_TUNNEL_OPTS_MAX)
365 return -EINVAL;
366
367 memcpy(opt->opt_data, nla_data(attr), data_len);
368 opt->length = data_len / 4;
369 opt->opt_class = nla_get_be16(tb[NFTA_TUNNEL_KEY_GENEVE_CLASS]);
370 opt->type = nla_get_u8(tb[NFTA_TUNNEL_KEY_GENEVE_TYPE]);
371 ip_tunnel_flags_zero(opts->flags);
372 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, opts->flags);
373
374 return 0;
375 }
376
377 static const struct nla_policy nft_tunnel_opts_policy[NFTA_TUNNEL_KEY_OPTS_MAX + 1] = {
378 [NFTA_TUNNEL_KEY_OPTS_UNSPEC] = {
379 .strict_start_type = NFTA_TUNNEL_KEY_OPTS_GENEVE },
380 [NFTA_TUNNEL_KEY_OPTS_VXLAN] = { .type = NLA_NESTED, },
381 [NFTA_TUNNEL_KEY_OPTS_ERSPAN] = { .type = NLA_NESTED, },
382 [NFTA_TUNNEL_KEY_OPTS_GENEVE] = { .type = NLA_NESTED, },
383 };
384
nft_tunnel_obj_opts_init(const struct nft_ctx * ctx,const struct nlattr * attr,struct ip_tunnel_info * info,struct nft_tunnel_opts * opts)385 static int nft_tunnel_obj_opts_init(const struct nft_ctx *ctx,
386 const struct nlattr *attr,
387 struct ip_tunnel_info *info,
388 struct nft_tunnel_opts *opts)
389 {
390 struct nlattr *nla;
391 int err, rem;
392 u32 type = 0;
393
394 err = nla_validate_nested_deprecated(attr, NFTA_TUNNEL_KEY_OPTS_MAX,
395 nft_tunnel_opts_policy, NULL);
396 if (err < 0)
397 return err;
398
399 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
400 switch (nla_type(nla)) {
401 case NFTA_TUNNEL_KEY_OPTS_VXLAN:
402 if (type)
403 return -EINVAL;
404 err = nft_tunnel_obj_vxlan_init(nla, opts);
405 if (err)
406 return err;
407 type = IP_TUNNEL_VXLAN_OPT_BIT;
408 break;
409 case NFTA_TUNNEL_KEY_OPTS_ERSPAN:
410 if (type)
411 return -EINVAL;
412 err = nft_tunnel_obj_erspan_init(nla, opts);
413 if (err)
414 return err;
415 type = IP_TUNNEL_ERSPAN_OPT_BIT;
416 break;
417 case NFTA_TUNNEL_KEY_OPTS_GENEVE:
418 if (type && type != IP_TUNNEL_GENEVE_OPT_BIT)
419 return -EINVAL;
420 err = nft_tunnel_obj_geneve_init(nla, opts);
421 if (err)
422 return err;
423 type = IP_TUNNEL_GENEVE_OPT_BIT;
424 break;
425 default:
426 return -EOPNOTSUPP;
427 }
428 }
429
430 return err;
431 }
432
433 static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] = {
434 [NFTA_TUNNEL_KEY_IP] = { .type = NLA_NESTED, },
435 [NFTA_TUNNEL_KEY_IP6] = { .type = NLA_NESTED, },
436 [NFTA_TUNNEL_KEY_ID] = { .type = NLA_U32, },
437 [NFTA_TUNNEL_KEY_FLAGS] = { .type = NLA_U32, },
438 [NFTA_TUNNEL_KEY_TOS] = { .type = NLA_U8, },
439 [NFTA_TUNNEL_KEY_TTL] = { .type = NLA_U8, },
440 [NFTA_TUNNEL_KEY_SPORT] = { .type = NLA_U16, },
441 [NFTA_TUNNEL_KEY_DPORT] = { .type = NLA_U16, },
442 [NFTA_TUNNEL_KEY_OPTS] = { .type = NLA_NESTED, },
443 };
444
nft_tunnel_obj_init(const struct nft_ctx * ctx,const struct nlattr * const tb[],struct nft_object * obj)445 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
446 const struct nlattr * const tb[],
447 struct nft_object *obj)
448 {
449 struct nft_tunnel_obj *priv = nft_obj_data(obj);
450 struct ip_tunnel_info info;
451 struct metadata_dst *md;
452 int err;
453
454 if (!tb[NFTA_TUNNEL_KEY_ID])
455 return -EINVAL;
456
457 memset(&info, 0, sizeof(info));
458 info.mode = IP_TUNNEL_INFO_TX;
459 info.key.tun_id = key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
460 __set_bit(IP_TUNNEL_KEY_BIT, info.key.tun_flags);
461 __set_bit(IP_TUNNEL_CSUM_BIT, info.key.tun_flags);
462 __set_bit(IP_TUNNEL_NOCACHE_BIT, info.key.tun_flags);
463
464 if (tb[NFTA_TUNNEL_KEY_IP]) {
465 err = nft_tunnel_obj_ip_init(ctx, tb[NFTA_TUNNEL_KEY_IP], &info);
466 if (err < 0)
467 return err;
468 } else if (tb[NFTA_TUNNEL_KEY_IP6]) {
469 err = nft_tunnel_obj_ip6_init(ctx, tb[NFTA_TUNNEL_KEY_IP6], &info);
470 if (err < 0)
471 return err;
472 } else {
473 return -EINVAL;
474 }
475
476 if (tb[NFTA_TUNNEL_KEY_SPORT]) {
477 info.key.tp_src = nla_get_be16(tb[NFTA_TUNNEL_KEY_SPORT]);
478 }
479 if (tb[NFTA_TUNNEL_KEY_DPORT]) {
480 info.key.tp_dst = nla_get_be16(tb[NFTA_TUNNEL_KEY_DPORT]);
481 }
482
483 if (tb[NFTA_TUNNEL_KEY_FLAGS]) {
484 u32 tun_flags;
485
486 tun_flags = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_FLAGS]));
487 if (tun_flags & ~NFT_TUNNEL_F_MASK)
488 return -EOPNOTSUPP;
489
490 if (tun_flags & NFT_TUNNEL_F_ZERO_CSUM_TX)
491 __clear_bit(IP_TUNNEL_CSUM_BIT, info.key.tun_flags);
492 if (tun_flags & NFT_TUNNEL_F_DONT_FRAGMENT)
493 __set_bit(IP_TUNNEL_DONT_FRAGMENT_BIT,
494 info.key.tun_flags);
495 if (tun_flags & NFT_TUNNEL_F_SEQ_NUMBER)
496 __set_bit(IP_TUNNEL_SEQ_BIT, info.key.tun_flags);
497 }
498 if (tb[NFTA_TUNNEL_KEY_TOS])
499 info.key.tos = nla_get_u8(tb[NFTA_TUNNEL_KEY_TOS]);
500 if (tb[NFTA_TUNNEL_KEY_TTL])
501 info.key.ttl = nla_get_u8(tb[NFTA_TUNNEL_KEY_TTL]);
502 else
503 info.key.ttl = U8_MAX;
504
505 if (tb[NFTA_TUNNEL_KEY_OPTS]) {
506 err = nft_tunnel_obj_opts_init(ctx, tb[NFTA_TUNNEL_KEY_OPTS],
507 &info, &priv->opts);
508 if (err < 0)
509 return err;
510 }
511
512 md = metadata_dst_alloc(priv->opts.len, METADATA_IP_TUNNEL, GFP_KERNEL);
513 if (!md)
514 return -ENOMEM;
515
516 memcpy(&md->u.tun_info, &info, sizeof(info));
517 #ifdef CONFIG_DST_CACHE
518 err = dst_cache_init(&md->u.tun_info.dst_cache, GFP_KERNEL);
519 if (err < 0) {
520 metadata_dst_free(md);
521 return err;
522 }
523 #endif
524 ip_tunnel_info_opts_set(&md->u.tun_info, &priv->opts.u, priv->opts.len,
525 priv->opts.flags);
526 priv->md = md;
527
528 return 0;
529 }
530
nft_tunnel_obj_eval(struct nft_object * obj,struct nft_regs * regs,const struct nft_pktinfo * pkt)531 static inline void nft_tunnel_obj_eval(struct nft_object *obj,
532 struct nft_regs *regs,
533 const struct nft_pktinfo *pkt)
534 {
535 struct nft_tunnel_obj *priv = nft_obj_data(obj);
536 struct sk_buff *skb = pkt->skb;
537
538 skb_dst_drop(skb);
539 dst_hold((struct dst_entry *) priv->md);
540 skb_dst_set(skb, (struct dst_entry *) priv->md);
541 }
542
nft_tunnel_ip_dump(struct sk_buff * skb,struct ip_tunnel_info * info)543 static int nft_tunnel_ip_dump(struct sk_buff *skb, struct ip_tunnel_info *info)
544 {
545 struct nlattr *nest;
546
547 if (info->mode & IP_TUNNEL_INFO_IPV6) {
548 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP6);
549 if (!nest)
550 return -1;
551
552 if (nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_SRC,
553 &info->key.u.ipv6.src) < 0 ||
554 nla_put_in6_addr(skb, NFTA_TUNNEL_KEY_IP6_DST,
555 &info->key.u.ipv6.dst) < 0 ||
556 nla_put_be32(skb, NFTA_TUNNEL_KEY_IP6_FLOWLABEL,
557 info->key.label)) {
558 nla_nest_cancel(skb, nest);
559 return -1;
560 }
561
562 nla_nest_end(skb, nest);
563 } else {
564 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_IP);
565 if (!nest)
566 return -1;
567
568 if (nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_SRC,
569 info->key.u.ipv4.src) < 0 ||
570 nla_put_in_addr(skb, NFTA_TUNNEL_KEY_IP_DST,
571 info->key.u.ipv4.dst) < 0) {
572 nla_nest_cancel(skb, nest);
573 return -1;
574 }
575
576 nla_nest_end(skb, nest);
577 }
578
579 return 0;
580 }
581
nft_tunnel_opts_dump(struct sk_buff * skb,struct nft_tunnel_obj * priv)582 static int nft_tunnel_opts_dump(struct sk_buff *skb,
583 struct nft_tunnel_obj *priv)
584 {
585 struct nft_tunnel_opts *opts = &priv->opts;
586 struct nlattr *nest, *inner;
587
588 nest = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS);
589 if (!nest)
590 return -1;
591
592 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, opts->flags)) {
593 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_VXLAN);
594 if (!inner)
595 goto failure;
596 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_VXLAN_GBP,
597 htonl(opts->u.vxlan.gbp)))
598 goto inner_failure;
599 nla_nest_end(skb, inner);
600 } else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, opts->flags)) {
601 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_ERSPAN);
602 if (!inner)
603 goto failure;
604 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_VERSION,
605 htonl(opts->u.erspan.version)))
606 goto inner_failure;
607 switch (opts->u.erspan.version) {
608 case ERSPAN_VERSION:
609 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ERSPAN_V1_INDEX,
610 opts->u.erspan.u.index))
611 goto inner_failure;
612 break;
613 case ERSPAN_VERSION2:
614 if (nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_HWID,
615 get_hwid(&opts->u.erspan.u.md2)) ||
616 nla_put_u8(skb, NFTA_TUNNEL_KEY_ERSPAN_V2_DIR,
617 opts->u.erspan.u.md2.dir))
618 goto inner_failure;
619 break;
620 }
621 nla_nest_end(skb, inner);
622 } else if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, opts->flags)) {
623 struct geneve_opt *opt;
624 int offset = 0;
625
626 inner = nla_nest_start_noflag(skb, NFTA_TUNNEL_KEY_OPTS_GENEVE);
627 if (!inner)
628 goto failure;
629 while (opts->len > offset) {
630 opt = (struct geneve_opt *)opts->u.data + offset;
631 if (nla_put_be16(skb, NFTA_TUNNEL_KEY_GENEVE_CLASS,
632 opt->opt_class) ||
633 nla_put_u8(skb, NFTA_TUNNEL_KEY_GENEVE_TYPE,
634 opt->type) ||
635 nla_put(skb, NFTA_TUNNEL_KEY_GENEVE_DATA,
636 opt->length * 4, opt->opt_data))
637 goto inner_failure;
638 offset += sizeof(*opt) + opt->length * 4;
639 }
640 nla_nest_end(skb, inner);
641 }
642 nla_nest_end(skb, nest);
643 return 0;
644
645 inner_failure:
646 nla_nest_cancel(skb, inner);
647 failure:
648 nla_nest_cancel(skb, nest);
649 return -1;
650 }
651
nft_tunnel_ports_dump(struct sk_buff * skb,struct ip_tunnel_info * info)652 static int nft_tunnel_ports_dump(struct sk_buff *skb,
653 struct ip_tunnel_info *info)
654 {
655 if (nla_put_be16(skb, NFTA_TUNNEL_KEY_SPORT, info->key.tp_src) < 0 ||
656 nla_put_be16(skb, NFTA_TUNNEL_KEY_DPORT, info->key.tp_dst) < 0)
657 return -1;
658
659 return 0;
660 }
661
nft_tunnel_flags_dump(struct sk_buff * skb,struct ip_tunnel_info * info)662 static int nft_tunnel_flags_dump(struct sk_buff *skb,
663 struct ip_tunnel_info *info)
664 {
665 u32 flags = 0;
666
667 if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, info->key.tun_flags))
668 flags |= NFT_TUNNEL_F_DONT_FRAGMENT;
669 if (!test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags))
670 flags |= NFT_TUNNEL_F_ZERO_CSUM_TX;
671 if (test_bit(IP_TUNNEL_SEQ_BIT, info->key.tun_flags))
672 flags |= NFT_TUNNEL_F_SEQ_NUMBER;
673
674 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_FLAGS, htonl(flags)) < 0)
675 return -1;
676
677 return 0;
678 }
679
nft_tunnel_obj_dump(struct sk_buff * skb,struct nft_object * obj,bool reset)680 static int nft_tunnel_obj_dump(struct sk_buff *skb,
681 struct nft_object *obj, bool reset)
682 {
683 struct nft_tunnel_obj *priv = nft_obj_data(obj);
684 struct ip_tunnel_info *info = &priv->md->u.tun_info;
685
686 if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
687 tunnel_id_to_key32(info->key.tun_id)) ||
688 nft_tunnel_ip_dump(skb, info) < 0 ||
689 nft_tunnel_ports_dump(skb, info) < 0 ||
690 nft_tunnel_flags_dump(skb, info) < 0 ||
691 nla_put_u8(skb, NFTA_TUNNEL_KEY_TOS, info->key.tos) ||
692 nla_put_u8(skb, NFTA_TUNNEL_KEY_TTL, info->key.ttl) ||
693 nft_tunnel_opts_dump(skb, priv) < 0)
694 goto nla_put_failure;
695
696 return 0;
697
698 nla_put_failure:
699 return -1;
700 }
701
nft_tunnel_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)702 static void nft_tunnel_obj_destroy(const struct nft_ctx *ctx,
703 struct nft_object *obj)
704 {
705 struct nft_tunnel_obj *priv = nft_obj_data(obj);
706
707 metadata_dst_free(priv->md);
708 }
709
710 static struct nft_object_type nft_tunnel_obj_type;
711 static const struct nft_object_ops nft_tunnel_obj_ops = {
712 .type = &nft_tunnel_obj_type,
713 .size = sizeof(struct nft_tunnel_obj),
714 .eval = nft_tunnel_obj_eval,
715 .init = nft_tunnel_obj_init,
716 .destroy = nft_tunnel_obj_destroy,
717 .dump = nft_tunnel_obj_dump,
718 };
719
720 static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
721 .type = NFT_OBJECT_TUNNEL,
722 .family = NFPROTO_NETDEV,
723 .ops = &nft_tunnel_obj_ops,
724 .maxattr = NFTA_TUNNEL_KEY_MAX,
725 .policy = nft_tunnel_key_policy,
726 .owner = THIS_MODULE,
727 };
728
nft_tunnel_module_init(void)729 static int __init nft_tunnel_module_init(void)
730 {
731 int err;
732
733 err = nft_register_expr(&nft_tunnel_type);
734 if (err < 0)
735 return err;
736
737 err = nft_register_obj(&nft_tunnel_obj_type);
738 if (err < 0)
739 nft_unregister_expr(&nft_tunnel_type);
740
741 return err;
742 }
743
nft_tunnel_module_exit(void)744 static void __exit nft_tunnel_module_exit(void)
745 {
746 nft_unregister_obj(&nft_tunnel_obj_type);
747 nft_unregister_expr(&nft_tunnel_type);
748 }
749
750 module_init(nft_tunnel_module_init);
751 module_exit(nft_tunnel_module_exit);
752
753 MODULE_LICENSE("GPL");
754 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
755 MODULE_ALIAS_NFT_EXPR("tunnel");
756 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_TUNNEL);
757 MODULE_DESCRIPTION("nftables tunnel expression support");
758