1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * IPv6 IOAM Lightweight Tunnel implementation
4 *
5 * Author:
6 * Justin Iurman <justin.iurman@uliege.be>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/skbuff.h>
11 #include <linux/net.h>
12 #include <linux/in6.h>
13 #include <linux/ioam6.h>
14 #include <linux/ioam6_iptunnel.h>
15 #include <net/dst.h>
16 #include <net/sock.h>
17 #include <net/lwtunnel.h>
18 #include <net/ioam6.h>
19 #include <net/netlink.h>
20 #include <net/ipv6.h>
21 #include <net/dst_cache.h>
22 #include <net/ip6_route.h>
23 #include <net/addrconf.h>
24
25 #define IOAM6_MASK_SHORT_FIELDS 0xff100000
26 #define IOAM6_MASK_WIDE_FIELDS 0xe00000
27
28 struct ioam6_lwt_encap {
29 struct ipv6_hopopt_hdr eh;
30 u8 pad[2]; /* 2-octet padding for 4n-alignment */
31 struct ioam6_hdr ioamh;
32 struct ioam6_trace_hdr traceh;
33 } __packed;
34
35 struct ioam6_lwt_freq {
36 u32 k;
37 u32 n;
38 };
39
40 struct ioam6_lwt {
41 struct dst_entry null_dst;
42 struct dst_cache cache;
43 struct ioam6_lwt_freq freq;
44 atomic_t pkt_cnt;
45 u8 mode;
46 bool has_tunsrc;
47 struct in6_addr tunsrc;
48 struct in6_addr tundst;
49 struct ioam6_lwt_encap tuninfo;
50 };
51
52 static const struct netlink_range_validation freq_range = {
53 .min = IOAM6_IPTUNNEL_FREQ_MIN,
54 .max = IOAM6_IPTUNNEL_FREQ_MAX,
55 };
56
ioam6_lwt_state(struct lwtunnel_state * lwt)57 static struct ioam6_lwt *ioam6_lwt_state(struct lwtunnel_state *lwt)
58 {
59 return (struct ioam6_lwt *)lwt->data;
60 }
61
ioam6_lwt_info(struct lwtunnel_state * lwt)62 static struct ioam6_lwt_encap *ioam6_lwt_info(struct lwtunnel_state *lwt)
63 {
64 return &ioam6_lwt_state(lwt)->tuninfo;
65 }
66
ioam6_lwt_trace(struct lwtunnel_state * lwt)67 static struct ioam6_trace_hdr *ioam6_lwt_trace(struct lwtunnel_state *lwt)
68 {
69 return &(ioam6_lwt_state(lwt)->tuninfo.traceh);
70 }
71
72 static const struct nla_policy ioam6_iptunnel_policy[IOAM6_IPTUNNEL_MAX + 1] = {
73 [IOAM6_IPTUNNEL_FREQ_K] = NLA_POLICY_FULL_RANGE(NLA_U32, &freq_range),
74 [IOAM6_IPTUNNEL_FREQ_N] = NLA_POLICY_FULL_RANGE(NLA_U32, &freq_range),
75 [IOAM6_IPTUNNEL_MODE] = NLA_POLICY_RANGE(NLA_U8,
76 IOAM6_IPTUNNEL_MODE_MIN,
77 IOAM6_IPTUNNEL_MODE_MAX),
78 [IOAM6_IPTUNNEL_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
79 [IOAM6_IPTUNNEL_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
80 [IOAM6_IPTUNNEL_TRACE] = NLA_POLICY_EXACT_LEN(
81 sizeof(struct ioam6_trace_hdr)),
82 };
83
ioam6_validate_trace_hdr(struct ioam6_trace_hdr * trace)84 static bool ioam6_validate_trace_hdr(struct ioam6_trace_hdr *trace)
85 {
86 u32 fields;
87
88 if (!trace->type_be32 || !trace->remlen ||
89 trace->remlen > IOAM6_TRACE_DATA_SIZE_MAX / 4 ||
90 trace->type.bit12 | trace->type.bit13 | trace->type.bit14 |
91 trace->type.bit15 | trace->type.bit16 | trace->type.bit17 |
92 trace->type.bit18 | trace->type.bit19 | trace->type.bit20 |
93 trace->type.bit21 | trace->type.bit23)
94 return false;
95
96 trace->nodelen = 0;
97 fields = be32_to_cpu(trace->type_be32);
98
99 trace->nodelen += hweight32(fields & IOAM6_MASK_SHORT_FIELDS)
100 * (sizeof(__be32) / 4);
101 trace->nodelen += hweight32(fields & IOAM6_MASK_WIDE_FIELDS)
102 * (sizeof(__be64) / 4);
103
104 return true;
105 }
106
ioam6_build_state(struct net * net,struct nlattr * nla,unsigned int family,const void * cfg,struct lwtunnel_state ** ts,struct netlink_ext_ack * extack)107 static int ioam6_build_state(struct net *net, struct nlattr *nla,
108 unsigned int family, const void *cfg,
109 struct lwtunnel_state **ts,
110 struct netlink_ext_ack *extack)
111 {
112 struct nlattr *tb[IOAM6_IPTUNNEL_MAX + 1];
113 struct ioam6_lwt_encap *tuninfo;
114 struct ioam6_trace_hdr *trace;
115 struct lwtunnel_state *lwt;
116 struct ioam6_lwt *ilwt;
117 int len_aligned, err;
118 u32 freq_k, freq_n;
119 u8 mode;
120
121 if (family != AF_INET6)
122 return -EINVAL;
123
124 err = nla_parse_nested(tb, IOAM6_IPTUNNEL_MAX, nla,
125 ioam6_iptunnel_policy, extack);
126 if (err < 0)
127 return err;
128
129 if ((!tb[IOAM6_IPTUNNEL_FREQ_K] && tb[IOAM6_IPTUNNEL_FREQ_N]) ||
130 (tb[IOAM6_IPTUNNEL_FREQ_K] && !tb[IOAM6_IPTUNNEL_FREQ_N])) {
131 NL_SET_ERR_MSG(extack, "freq: missing parameter");
132 return -EINVAL;
133 } else if (!tb[IOAM6_IPTUNNEL_FREQ_K] && !tb[IOAM6_IPTUNNEL_FREQ_N]) {
134 freq_k = IOAM6_IPTUNNEL_FREQ_MIN;
135 freq_n = IOAM6_IPTUNNEL_FREQ_MIN;
136 } else {
137 freq_k = nla_get_u32(tb[IOAM6_IPTUNNEL_FREQ_K]);
138 freq_n = nla_get_u32(tb[IOAM6_IPTUNNEL_FREQ_N]);
139
140 if (freq_k > freq_n) {
141 NL_SET_ERR_MSG(extack, "freq: k > n is forbidden");
142 return -EINVAL;
143 }
144 }
145
146 mode = nla_get_u8_default(tb[IOAM6_IPTUNNEL_MODE],
147 IOAM6_IPTUNNEL_MODE_INLINE);
148
149 if (tb[IOAM6_IPTUNNEL_SRC] && mode == IOAM6_IPTUNNEL_MODE_INLINE) {
150 NL_SET_ERR_MSG(extack, "no tunnel src expected with this mode");
151 return -EINVAL;
152 }
153
154 if (!tb[IOAM6_IPTUNNEL_DST] && mode != IOAM6_IPTUNNEL_MODE_INLINE) {
155 NL_SET_ERR_MSG(extack, "this mode needs a tunnel destination");
156 return -EINVAL;
157 }
158
159 if (!tb[IOAM6_IPTUNNEL_TRACE]) {
160 NL_SET_ERR_MSG(extack, "missing trace");
161 return -EINVAL;
162 }
163
164 trace = nla_data(tb[IOAM6_IPTUNNEL_TRACE]);
165 if (!ioam6_validate_trace_hdr(trace)) {
166 NL_SET_ERR_MSG_ATTR(extack, tb[IOAM6_IPTUNNEL_TRACE],
167 "invalid trace validation");
168 return -EINVAL;
169 }
170
171 len_aligned = ALIGN(trace->remlen * 4, 8);
172 lwt = lwtunnel_state_alloc(sizeof(*ilwt) + len_aligned);
173 if (!lwt)
174 return -ENOMEM;
175
176 ilwt = ioam6_lwt_state(lwt);
177 err = dst_cache_init(&ilwt->cache, GFP_ATOMIC);
178 if (err)
179 goto free_lwt;
180
181 /* This "fake" dst_entry will be stored in a dst_cache, which will call
182 * dst_hold() and dst_release() on it. We must ensure that dst_destroy()
183 * will never be called. For that, its initial refcount is 1 and +1 when
184 * it is stored in the cache. Then, +1/-1 each time we read the cache
185 * and release it. Long story short, we're fine.
186 */
187 dst_init(&ilwt->null_dst, NULL, NULL, DST_OBSOLETE_NONE, DST_NOCOUNT);
188
189 atomic_set(&ilwt->pkt_cnt, 0);
190 ilwt->freq.k = freq_k;
191 ilwt->freq.n = freq_n;
192
193 ilwt->mode = mode;
194
195 if (!tb[IOAM6_IPTUNNEL_SRC]) {
196 ilwt->has_tunsrc = false;
197 } else {
198 ilwt->has_tunsrc = true;
199 ilwt->tunsrc = nla_get_in6_addr(tb[IOAM6_IPTUNNEL_SRC]);
200
201 if (ipv6_addr_any(&ilwt->tunsrc)) {
202 NL_SET_ERR_MSG_ATTR(extack, tb[IOAM6_IPTUNNEL_SRC],
203 "invalid tunnel source address");
204 err = -EINVAL;
205 goto free_cache;
206 }
207 }
208
209 if (tb[IOAM6_IPTUNNEL_DST]) {
210 ilwt->tundst = nla_get_in6_addr(tb[IOAM6_IPTUNNEL_DST]);
211
212 if (ipv6_addr_any(&ilwt->tundst)) {
213 NL_SET_ERR_MSG_ATTR(extack, tb[IOAM6_IPTUNNEL_DST],
214 "invalid tunnel dest address");
215 err = -EINVAL;
216 goto free_cache;
217 }
218 }
219
220 tuninfo = ioam6_lwt_info(lwt);
221 tuninfo->eh.hdrlen = ((sizeof(*tuninfo) + len_aligned) >> 3) - 1;
222 tuninfo->pad[0] = IPV6_TLV_PADN;
223 tuninfo->ioamh.type = IOAM6_TYPE_PREALLOC;
224 tuninfo->ioamh.opt_type = IPV6_TLV_IOAM;
225 tuninfo->ioamh.opt_len = sizeof(tuninfo->ioamh) - 2 + sizeof(*trace)
226 + trace->remlen * 4;
227
228 memcpy(&tuninfo->traceh, trace, sizeof(*trace));
229
230 if (len_aligned - trace->remlen * 4) {
231 tuninfo->traceh.data[trace->remlen * 4] = IPV6_TLV_PADN;
232 tuninfo->traceh.data[trace->remlen * 4 + 1] = 2;
233 }
234
235 lwt->type = LWTUNNEL_ENCAP_IOAM6;
236 lwt->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT;
237
238 *ts = lwt;
239
240 return 0;
241 free_cache:
242 dst_cache_destroy(&ilwt->cache);
243 free_lwt:
244 kfree(lwt);
245 return err;
246 }
247
ioam6_do_fill(struct net * net,struct sk_buff * skb)248 static int ioam6_do_fill(struct net *net, struct sk_buff *skb)
249 {
250 struct ioam6_trace_hdr *trace;
251 struct ioam6_namespace *ns;
252
253 trace = (struct ioam6_trace_hdr *)(skb_transport_header(skb)
254 + sizeof(struct ipv6_hopopt_hdr) + 2
255 + sizeof(struct ioam6_hdr));
256
257 ns = ioam6_namespace(net, trace->namespace_id);
258 if (ns)
259 ioam6_fill_trace_data(skb, ns, trace, false);
260
261 return 0;
262 }
263
ioam6_do_inline(struct net * net,struct sk_buff * skb,struct ioam6_lwt_encap * tuninfo,struct dst_entry * cache_dst)264 static int ioam6_do_inline(struct net *net, struct sk_buff *skb,
265 struct ioam6_lwt_encap *tuninfo,
266 struct dst_entry *cache_dst)
267 {
268 struct ipv6hdr *oldhdr, *hdr;
269 int hdrlen, err;
270
271 hdrlen = (tuninfo->eh.hdrlen + 1) << 3;
272
273 err = skb_cow_head(skb, hdrlen + dst_dev_overhead(cache_dst, skb));
274 if (unlikely(err))
275 return err;
276
277 oldhdr = ipv6_hdr(skb);
278 skb_pull(skb, sizeof(*oldhdr));
279 skb_postpull_rcsum(skb, skb_network_header(skb), sizeof(*oldhdr));
280
281 skb_push(skb, sizeof(*oldhdr) + hdrlen);
282 skb_reset_network_header(skb);
283 skb_mac_header_rebuild(skb);
284
285 hdr = ipv6_hdr(skb);
286 memmove(hdr, oldhdr, sizeof(*oldhdr));
287 tuninfo->eh.nexthdr = hdr->nexthdr;
288
289 skb_set_transport_header(skb, sizeof(*hdr));
290 skb_postpush_rcsum(skb, hdr, sizeof(*hdr) + hdrlen);
291
292 memcpy(skb_transport_header(skb), (u8 *)tuninfo, hdrlen);
293
294 hdr->nexthdr = NEXTHDR_HOP;
295 hdr->payload_len = cpu_to_be16(skb->len - sizeof(*hdr));
296
297 return ioam6_do_fill(net, skb);
298 }
299
ioam6_do_encap(struct net * net,struct sk_buff * skb,struct ioam6_lwt_encap * tuninfo,bool has_tunsrc,struct in6_addr * tunsrc,struct in6_addr * tundst,struct dst_entry * cache_dst)300 static int ioam6_do_encap(struct net *net, struct sk_buff *skb,
301 struct ioam6_lwt_encap *tuninfo,
302 bool has_tunsrc,
303 struct in6_addr *tunsrc,
304 struct in6_addr *tundst,
305 struct dst_entry *cache_dst)
306 {
307 struct dst_entry *dst = skb_dst(skb);
308 struct ipv6hdr *hdr, *inner_hdr;
309 int hdrlen, len, err;
310
311 hdrlen = (tuninfo->eh.hdrlen + 1) << 3;
312 len = sizeof(*hdr) + hdrlen;
313
314 err = skb_cow_head(skb, len + dst_dev_overhead(cache_dst, skb));
315 if (unlikely(err))
316 return err;
317
318 inner_hdr = ipv6_hdr(skb);
319
320 skb_push(skb, len);
321 skb_reset_network_header(skb);
322 skb_mac_header_rebuild(skb);
323 skb_set_transport_header(skb, sizeof(*hdr));
324
325 tuninfo->eh.nexthdr = NEXTHDR_IPV6;
326 memcpy(skb_transport_header(skb), (u8 *)tuninfo, hdrlen);
327
328 hdr = ipv6_hdr(skb);
329 memcpy(hdr, inner_hdr, sizeof(*hdr));
330
331 hdr->nexthdr = NEXTHDR_HOP;
332 hdr->payload_len = cpu_to_be16(skb->len - sizeof(*hdr));
333 hdr->daddr = *tundst;
334
335 if (has_tunsrc)
336 memcpy(&hdr->saddr, tunsrc, sizeof(*tunsrc));
337 else
338 ipv6_dev_get_saddr(net, dst_dev(dst), &hdr->daddr,
339 IPV6_PREFER_SRC_PUBLIC, &hdr->saddr);
340
341 skb_postpush_rcsum(skb, hdr, len);
342
343 return ioam6_do_fill(net, skb);
344 }
345
ioam6_output(struct net * net,struct sock * sk,struct sk_buff * skb)346 static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
347 {
348 struct dst_entry *orig_dst = skb_dst(skb);
349 struct dst_entry *dst = NULL;
350 struct ioam6_lwt *ilwt;
351 int err = -EINVAL;
352 u32 pkt_cnt;
353
354 if (skb->protocol != htons(ETH_P_IPV6))
355 goto drop;
356
357 ilwt = ioam6_lwt_state(orig_dst->lwtstate);
358
359 /* Check for insertion frequency (i.e., "k over n" insertions) */
360 pkt_cnt = atomic_fetch_inc(&ilwt->pkt_cnt);
361 if (pkt_cnt % ilwt->freq.n >= ilwt->freq.k)
362 goto out;
363
364 local_bh_disable();
365 dst = dst_cache_get(&ilwt->cache);
366 local_bh_enable();
367
368 /* This is how we notify that the destination does not change after
369 * transformation and that we need to use orig_dst instead of the cache
370 */
371 if (dst == &ilwt->null_dst) {
372 dst_release(dst);
373
374 dst = orig_dst;
375 /* keep refcount balance: dst_release() is called at the end */
376 dst_hold(dst);
377 }
378
379 switch (ilwt->mode) {
380 case IOAM6_IPTUNNEL_MODE_INLINE:
381 do_inline:
382 /* Direct insertion - if there is no Hop-by-Hop yet */
383 if (ipv6_hdr(skb)->nexthdr == NEXTHDR_HOP)
384 goto out;
385
386 err = ioam6_do_inline(net, skb, &ilwt->tuninfo, dst);
387 if (unlikely(err))
388 goto drop;
389
390 break;
391 case IOAM6_IPTUNNEL_MODE_ENCAP:
392 do_encap:
393 /* Encapsulation (ip6ip6) */
394 err = ioam6_do_encap(net, skb, &ilwt->tuninfo,
395 ilwt->has_tunsrc, &ilwt->tunsrc,
396 &ilwt->tundst, dst);
397 if (unlikely(err))
398 goto drop;
399
400 break;
401 case IOAM6_IPTUNNEL_MODE_AUTO:
402 /* Automatic (RFC8200 compliant):
403 * - local packets -> INLINE mode
404 * - in-transit packets -> ENCAP mode
405 */
406 if (!skb->dev)
407 goto do_inline;
408
409 goto do_encap;
410 default:
411 goto drop;
412 }
413
414 if (unlikely(!dst)) {
415 struct ipv6hdr *hdr = ipv6_hdr(skb);
416 struct flowi6 fl6;
417
418 memset(&fl6, 0, sizeof(fl6));
419 fl6.daddr = hdr->daddr;
420 fl6.saddr = hdr->saddr;
421 fl6.flowlabel = ip6_flowinfo(hdr);
422 fl6.flowi6_mark = skb->mark;
423 fl6.flowi6_proto = hdr->nexthdr;
424
425 dst = ip6_route_output(net, NULL, &fl6);
426 if (dst->error) {
427 err = dst->error;
428 goto drop;
429 }
430
431 /* If the destination is the same after transformation (which is
432 * a valid use case for IOAM), then we don't want to add it to
433 * the cache in order to avoid a reference loop. Instead, we add
434 * our fake dst_entry to the cache as a way to detect this case.
435 * Otherwise, we add the resolved destination to the cache.
436 */
437 local_bh_disable();
438 if (orig_dst->lwtstate == dst->lwtstate)
439 dst_cache_set_ip6(&ilwt->cache,
440 &ilwt->null_dst, &fl6.saddr);
441 else
442 dst_cache_set_ip6(&ilwt->cache, dst, &fl6.saddr);
443 local_bh_enable();
444
445 err = skb_cow_head(skb, LL_RESERVED_SPACE(dst_dev(dst)));
446 if (unlikely(err))
447 goto drop;
448 }
449
450 /* avoid lwtunnel_output() reentry loop when destination is the same
451 * after transformation (e.g., with the inline mode)
452 */
453 if (orig_dst->lwtstate != dst->lwtstate) {
454 skb_dst_drop(skb);
455 skb_dst_set(skb, dst);
456 return dst_output(net, sk, skb);
457 }
458 out:
459 dst_release(dst);
460 return orig_dst->lwtstate->orig_output(net, sk, skb);
461 drop:
462 dst_release(dst);
463 kfree_skb(skb);
464 return err;
465 }
466
ioam6_destroy_state(struct lwtunnel_state * lwt)467 static void ioam6_destroy_state(struct lwtunnel_state *lwt)
468 {
469 /* Since the refcount of per-cpu dst_entry caches will never be 0 (see
470 * why above) when our "fake" dst_entry is used, it is not necessary to
471 * remove them before calling dst_cache_destroy()
472 */
473 dst_cache_destroy(&ioam6_lwt_state(lwt)->cache);
474 }
475
ioam6_fill_encap_info(struct sk_buff * skb,struct lwtunnel_state * lwtstate)476 static int ioam6_fill_encap_info(struct sk_buff *skb,
477 struct lwtunnel_state *lwtstate)
478 {
479 struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
480 int err;
481
482 err = nla_put_u32(skb, IOAM6_IPTUNNEL_FREQ_K, ilwt->freq.k);
483 if (err)
484 goto ret;
485
486 err = nla_put_u32(skb, IOAM6_IPTUNNEL_FREQ_N, ilwt->freq.n);
487 if (err)
488 goto ret;
489
490 err = nla_put_u8(skb, IOAM6_IPTUNNEL_MODE, ilwt->mode);
491 if (err)
492 goto ret;
493
494 if (ilwt->mode != IOAM6_IPTUNNEL_MODE_INLINE) {
495 if (ilwt->has_tunsrc) {
496 err = nla_put_in6_addr(skb, IOAM6_IPTUNNEL_SRC,
497 &ilwt->tunsrc);
498 if (err)
499 goto ret;
500 }
501
502 err = nla_put_in6_addr(skb, IOAM6_IPTUNNEL_DST, &ilwt->tundst);
503 if (err)
504 goto ret;
505 }
506
507 err = nla_put(skb, IOAM6_IPTUNNEL_TRACE, sizeof(ilwt->tuninfo.traceh),
508 &ilwt->tuninfo.traceh);
509 ret:
510 return err;
511 }
512
ioam6_encap_nlsize(struct lwtunnel_state * lwtstate)513 static int ioam6_encap_nlsize(struct lwtunnel_state *lwtstate)
514 {
515 struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
516 int nlsize;
517
518 nlsize = nla_total_size(sizeof(ilwt->freq.k)) +
519 nla_total_size(sizeof(ilwt->freq.n)) +
520 nla_total_size(sizeof(ilwt->mode)) +
521 nla_total_size(sizeof(ilwt->tuninfo.traceh));
522
523 if (ilwt->mode != IOAM6_IPTUNNEL_MODE_INLINE) {
524 if (ilwt->has_tunsrc)
525 nlsize += nla_total_size(sizeof(ilwt->tunsrc));
526
527 nlsize += nla_total_size(sizeof(ilwt->tundst));
528 }
529
530 return nlsize;
531 }
532
ioam6_encap_cmp(struct lwtunnel_state * a,struct lwtunnel_state * b)533 static int ioam6_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
534 {
535 struct ioam6_trace_hdr *trace_a = ioam6_lwt_trace(a);
536 struct ioam6_trace_hdr *trace_b = ioam6_lwt_trace(b);
537 struct ioam6_lwt *ilwt_a = ioam6_lwt_state(a);
538 struct ioam6_lwt *ilwt_b = ioam6_lwt_state(b);
539
540 return (ilwt_a->freq.k != ilwt_b->freq.k ||
541 ilwt_a->freq.n != ilwt_b->freq.n ||
542 ilwt_a->mode != ilwt_b->mode ||
543 ilwt_a->has_tunsrc != ilwt_b->has_tunsrc ||
544 (ilwt_a->mode != IOAM6_IPTUNNEL_MODE_INLINE &&
545 !ipv6_addr_equal(&ilwt_a->tundst, &ilwt_b->tundst)) ||
546 (ilwt_a->mode != IOAM6_IPTUNNEL_MODE_INLINE &&
547 ilwt_a->has_tunsrc &&
548 !ipv6_addr_equal(&ilwt_a->tunsrc, &ilwt_b->tunsrc)) ||
549 trace_a->namespace_id != trace_b->namespace_id);
550 }
551
552 static const struct lwtunnel_encap_ops ioam6_iptun_ops = {
553 .build_state = ioam6_build_state,
554 .destroy_state = ioam6_destroy_state,
555 .output = ioam6_output,
556 .fill_encap = ioam6_fill_encap_info,
557 .get_encap_size = ioam6_encap_nlsize,
558 .cmp_encap = ioam6_encap_cmp,
559 .owner = THIS_MODULE,
560 };
561
ioam6_iptunnel_init(void)562 int __init ioam6_iptunnel_init(void)
563 {
564 return lwtunnel_encap_add_ops(&ioam6_iptun_ops, LWTUNNEL_ENCAP_IOAM6);
565 }
566
ioam6_iptunnel_exit(void)567 void ioam6_iptunnel_exit(void)
568 {
569 lwtunnel_encap_del_ops(&ioam6_iptun_ops, LWTUNNEL_ENCAP_IOAM6);
570 }
571