1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Checksum updating actions
4 *
5 * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
6 */
7
8#include <linux/types.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/spinlock.h>
13
14#include <linux/netlink.h>
15#include <net/netlink.h>
16#include <linux/rtnetlink.h>
17
18#include <linux/skbuff.h>
19
20#include <net/ip.h>
21#include <net/ipv6.h>
22#include <net/icmp.h>
23#include <linux/icmpv6.h>
24#include <linux/igmp.h>
25#include <net/tcp.h>
26#include <net/udp.h>
27#include <net/ip6_checksum.h>
28#include <net/sctp/checksum.h>
29
30#include <net/act_api.h>
31#include <net/pkt_cls.h>
32
33#include <linux/tc_act/tc_csum.h>
34#include <net/tc_act/tc_csum.h>
35#include <net/tc_wrapper.h>
36
37static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
38 [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
39};
40
41static struct tc_action_ops act_csum_ops;
42
43static int tcf_csum_init(struct net *net, struct nlattr *nla,
44 struct nlattr *est, struct tc_action **a,
45 struct tcf_proto *tp,
46 u32 flags, struct netlink_ext_ack *extack)
47{
48 struct tc_action_net *tn = net_generic(net, id: act_csum_ops.net_id);
49 bool bind = flags & TCA_ACT_FLAGS_BIND;
50 struct tcf_csum_params *params_new;
51 struct nlattr *tb[TCA_CSUM_MAX + 1];
52 struct tcf_chain *goto_ch = NULL;
53 struct tc_csum *parm;
54 struct tcf_csum *p;
55 int ret = 0, err;
56 u32 index;
57
58 if (nla == NULL)
59 return -EINVAL;
60
61 err = nla_parse_nested_deprecated(tb, TCA_CSUM_MAX, nla, policy: csum_policy,
62 NULL);
63 if (err < 0)
64 return err;
65
66 if (tb[TCA_CSUM_PARMS] == NULL)
67 return -EINVAL;
68 parm = nla_data(nla: tb[TCA_CSUM_PARMS]);
69 index = parm->index;
70 err = tcf_idr_check_alloc(tn, index: &index, a, bind);
71 if (!err) {
72 ret = tcf_idr_create_from_flags(tn, index, est, a,
73 ops: &act_csum_ops, bind, flags);
74 if (ret) {
75 tcf_idr_cleanup(tn, index);
76 return ret;
77 }
78 ret = ACT_P_CREATED;
79 } else if (err > 0) {
80 if (bind) /* dont override defaults */
81 return ACT_P_BOUND;
82 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
83 tcf_idr_release(a: *a, bind);
84 return -EEXIST;
85 }
86 } else {
87 return err;
88 }
89
90 err = tcf_action_check_ctrlact(action: parm->action, tp, handle: &goto_ch, newchain: extack);
91 if (err < 0)
92 goto release_idr;
93
94 p = to_tcf_csum(*a);
95
96 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
97 if (unlikely(!params_new)) {
98 err = -ENOMEM;
99 goto put_chain;
100 }
101 params_new->update_flags = parm->update_flags;
102 params_new->action = parm->action;
103
104 spin_lock_bh(lock: &p->tcf_lock);
105 goto_ch = tcf_action_set_ctrlact(a: *a, action: parm->action, newchain: goto_ch);
106 params_new = rcu_replace_pointer(p->params, params_new,
107 lockdep_is_held(&p->tcf_lock));
108 spin_unlock_bh(lock: &p->tcf_lock);
109
110 if (goto_ch)
111 tcf_chain_put_by_act(chain: goto_ch);
112 if (params_new)
113 kfree_rcu(params_new, rcu);
114
115 return ret;
116put_chain:
117 if (goto_ch)
118 tcf_chain_put_by_act(chain: goto_ch);
119release_idr:
120 tcf_idr_release(a: *a, bind);
121 return err;
122}
123
124/**
125 * tcf_csum_skb_nextlayer - Get next layer pointer
126 * @skb: sk_buff to use
127 * @ihl: previous summed headers length
128 * @ipl: complete packet length
129 * @jhl: next header length
130 *
131 * Check the expected next layer availability in the specified sk_buff.
132 * Return the next layer pointer if pass, NULL otherwise.
133 */
134static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
135 unsigned int ihl, unsigned int ipl,
136 unsigned int jhl)
137{
138 int ntkoff = skb_network_offset(skb);
139 int hl = ihl + jhl;
140
141 if (!pskb_may_pull(skb, len: ipl + ntkoff) || (ipl < hl) ||
142 skb_try_make_writable(skb, write_len: hl + ntkoff))
143 return NULL;
144 else
145 return (void *)(skb_network_header(skb) + ihl);
146}
147
148static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
149 unsigned int ipl)
150{
151 struct icmphdr *icmph;
152
153 icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*icmph));
154 if (icmph == NULL)
155 return 0;
156
157 icmph->checksum = 0;
158 skb->csum = csum_partial(buff: icmph, len: ipl - ihl, sum: 0);
159 icmph->checksum = csum_fold(csum: skb->csum);
160
161 skb->ip_summed = CHECKSUM_NONE;
162
163 return 1;
164}
165
166static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
167 unsigned int ihl, unsigned int ipl)
168{
169 struct igmphdr *igmph;
170
171 igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*igmph));
172 if (igmph == NULL)
173 return 0;
174
175 igmph->csum = 0;
176 skb->csum = csum_partial(buff: igmph, len: ipl - ihl, sum: 0);
177 igmph->csum = csum_fold(csum: skb->csum);
178
179 skb->ip_summed = CHECKSUM_NONE;
180
181 return 1;
182}
183
184static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
185 unsigned int ipl)
186{
187 struct icmp6hdr *icmp6h;
188 const struct ipv6hdr *ip6h;
189
190 icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*icmp6h));
191 if (icmp6h == NULL)
192 return 0;
193
194 ip6h = ipv6_hdr(skb);
195 icmp6h->icmp6_cksum = 0;
196 skb->csum = csum_partial(buff: icmp6h, len: ipl - ihl, sum: 0);
197 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr,
198 len: ipl - ihl, IPPROTO_ICMPV6,
199 csum: skb->csum);
200
201 skb->ip_summed = CHECKSUM_NONE;
202
203 return 1;
204}
205
206static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
207 unsigned int ipl)
208{
209 struct tcphdr *tcph;
210 const struct iphdr *iph;
211
212 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
213 return 1;
214
215 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*tcph));
216 if (tcph == NULL)
217 return 0;
218
219 iph = ip_hdr(skb);
220 tcph->check = 0;
221 skb->csum = csum_partial(buff: tcph, len: ipl - ihl, sum: 0);
222 tcph->check = tcp_v4_check(len: ipl - ihl,
223 saddr: iph->saddr, daddr: iph->daddr, base: skb->csum);
224
225 skb->ip_summed = CHECKSUM_NONE;
226
227 return 1;
228}
229
230static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
231 unsigned int ipl)
232{
233 struct tcphdr *tcph;
234 const struct ipv6hdr *ip6h;
235
236 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
237 return 1;
238
239 tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*tcph));
240 if (tcph == NULL)
241 return 0;
242
243 ip6h = ipv6_hdr(skb);
244 tcph->check = 0;
245 skb->csum = csum_partial(buff: tcph, len: ipl - ihl, sum: 0);
246 tcph->check = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr,
247 len: ipl - ihl, IPPROTO_TCP,
248 csum: skb->csum);
249
250 skb->ip_summed = CHECKSUM_NONE;
251
252 return 1;
253}
254
255static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
256 unsigned int ipl, int udplite)
257{
258 struct udphdr *udph;
259 const struct iphdr *iph;
260 u16 ul;
261
262 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
263 return 1;
264
265 /*
266 * Support both UDP and UDPLITE checksum algorithms, Don't use
267 * udph->len to get the real length without any protocol check,
268 * UDPLITE uses udph->len for another thing,
269 * Use iph->tot_len, or just ipl.
270 */
271
272 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*udph));
273 if (udph == NULL)
274 return 0;
275
276 iph = ip_hdr(skb);
277 ul = ntohs(udph->len);
278
279 if (udplite || udph->check) {
280
281 udph->check = 0;
282
283 if (udplite) {
284 if (ul == 0)
285 skb->csum = csum_partial(buff: udph, len: ipl - ihl, sum: 0);
286 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
287 skb->csum = csum_partial(buff: udph, len: ul, sum: 0);
288 else
289 goto ignore_obscure_skb;
290 } else {
291 if (ul != ipl - ihl)
292 goto ignore_obscure_skb;
293
294 skb->csum = csum_partial(buff: udph, len: ul, sum: 0);
295 }
296
297 udph->check = csum_tcpudp_magic(saddr: iph->saddr, daddr: iph->daddr,
298 len: ul, proto: iph->protocol,
299 sum: skb->csum);
300
301 if (!udph->check)
302 udph->check = CSUM_MANGLED_0;
303 }
304
305 skb->ip_summed = CHECKSUM_NONE;
306
307ignore_obscure_skb:
308 return 1;
309}
310
311static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
312 unsigned int ipl, int udplite)
313{
314 struct udphdr *udph;
315 const struct ipv6hdr *ip6h;
316 u16 ul;
317
318 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
319 return 1;
320
321 /*
322 * Support both UDP and UDPLITE checksum algorithms, Don't use
323 * udph->len to get the real length without any protocol check,
324 * UDPLITE uses udph->len for another thing,
325 * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
326 */
327
328 udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*udph));
329 if (udph == NULL)
330 return 0;
331
332 ip6h = ipv6_hdr(skb);
333 ul = ntohs(udph->len);
334
335 udph->check = 0;
336
337 if (udplite) {
338 if (ul == 0)
339 skb->csum = csum_partial(buff: udph, len: ipl - ihl, sum: 0);
340
341 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
342 skb->csum = csum_partial(buff: udph, len: ul, sum: 0);
343
344 else
345 goto ignore_obscure_skb;
346 } else {
347 if (ul != ipl - ihl)
348 goto ignore_obscure_skb;
349
350 skb->csum = csum_partial(buff: udph, len: ul, sum: 0);
351 }
352
353 udph->check = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr, len: ul,
354 proto: udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
355 csum: skb->csum);
356
357 if (!udph->check)
358 udph->check = CSUM_MANGLED_0;
359
360 skb->ip_summed = CHECKSUM_NONE;
361
362ignore_obscure_skb:
363 return 1;
364}
365
366static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
367 unsigned int ipl)
368{
369 struct sctphdr *sctph;
370
371 if (skb_is_gso(skb) && skb_is_gso_sctp(skb))
372 return 1;
373
374 sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, jhl: sizeof(*sctph));
375 if (!sctph)
376 return 0;
377
378 sctph->checksum = sctp_compute_cksum(skb,
379 offset: skb_network_offset(skb) + ihl);
380 skb_reset_csum_not_inet(skb);
381
382 return 1;
383}
384
385static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
386{
387 const struct iphdr *iph;
388 int ntkoff;
389
390 ntkoff = skb_network_offset(skb);
391
392 if (!pskb_may_pull(skb, len: sizeof(*iph) + ntkoff))
393 goto fail;
394
395 iph = ip_hdr(skb);
396
397 switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
398 case IPPROTO_ICMP:
399 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
400 if (!tcf_csum_ipv4_icmp(skb, ihl: iph->ihl * 4,
401 ntohs(iph->tot_len)))
402 goto fail;
403 break;
404 case IPPROTO_IGMP:
405 if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
406 if (!tcf_csum_ipv4_igmp(skb, ihl: iph->ihl * 4,
407 ntohs(iph->tot_len)))
408 goto fail;
409 break;
410 case IPPROTO_TCP:
411 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
412 if (!tcf_csum_ipv4_tcp(skb, ihl: iph->ihl * 4,
413 ntohs(iph->tot_len)))
414 goto fail;
415 break;
416 case IPPROTO_UDP:
417 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
418 if (!tcf_csum_ipv4_udp(skb, ihl: iph->ihl * 4,
419 ntohs(iph->tot_len), udplite: 0))
420 goto fail;
421 break;
422 case IPPROTO_UDPLITE:
423 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
424 if (!tcf_csum_ipv4_udp(skb, ihl: iph->ihl * 4,
425 ntohs(iph->tot_len), udplite: 1))
426 goto fail;
427 break;
428 case IPPROTO_SCTP:
429 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
430 !tcf_csum_sctp(skb, ihl: iph->ihl * 4, ntohs(iph->tot_len)))
431 goto fail;
432 break;
433 }
434
435 if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
436 if (skb_try_make_writable(skb, write_len: sizeof(*iph) + ntkoff))
437 goto fail;
438
439 ip_send_check(ip: ip_hdr(skb));
440 }
441
442 return 1;
443
444fail:
445 return 0;
446}
447
448static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
449 unsigned int *pl)
450{
451 int off, len, optlen;
452 unsigned char *xh = (void *)ip6xh;
453
454 off = sizeof(*ip6xh);
455 len = ixhl - off;
456
457 while (len > 1) {
458 switch (xh[off]) {
459 case IPV6_TLV_PAD1:
460 optlen = 1;
461 break;
462 case IPV6_TLV_JUMBO:
463 optlen = xh[off + 1] + 2;
464 if (optlen != 6 || len < 6 || (off & 3) != 2)
465 /* wrong jumbo option length/alignment */
466 return 0;
467 *pl = ntohl(*(__be32 *)(xh + off + 2));
468 goto done;
469 default:
470 optlen = xh[off + 1] + 2;
471 if (optlen > len)
472 /* ignore obscure options */
473 goto done;
474 break;
475 }
476 off += optlen;
477 len -= optlen;
478 }
479
480done:
481 return 1;
482}
483
484static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
485{
486 struct ipv6hdr *ip6h;
487 struct ipv6_opt_hdr *ip6xh;
488 unsigned int hl, ixhl;
489 unsigned int pl;
490 int ntkoff;
491 u8 nexthdr;
492
493 ntkoff = skb_network_offset(skb);
494
495 hl = sizeof(*ip6h);
496
497 if (!pskb_may_pull(skb, len: hl + ntkoff))
498 goto fail;
499
500 ip6h = ipv6_hdr(skb);
501
502 pl = ntohs(ip6h->payload_len);
503 nexthdr = ip6h->nexthdr;
504
505 do {
506 switch (nexthdr) {
507 case NEXTHDR_FRAGMENT:
508 goto ignore_skb;
509 case NEXTHDR_ROUTING:
510 case NEXTHDR_HOP:
511 case NEXTHDR_DEST:
512 if (!pskb_may_pull(skb, len: hl + sizeof(*ip6xh) + ntkoff))
513 goto fail;
514 ip6xh = (void *)(skb_network_header(skb) + hl);
515 ixhl = ipv6_optlen(ip6xh);
516 if (!pskb_may_pull(skb, len: hl + ixhl + ntkoff))
517 goto fail;
518 ip6xh = (void *)(skb_network_header(skb) + hl);
519 if ((nexthdr == NEXTHDR_HOP) &&
520 !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, pl: &pl)))
521 goto fail;
522 nexthdr = ip6xh->nexthdr;
523 hl += ixhl;
524 break;
525 case IPPROTO_ICMPV6:
526 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
527 if (!tcf_csum_ipv6_icmp(skb,
528 ihl: hl, ipl: pl + sizeof(*ip6h)))
529 goto fail;
530 goto done;
531 case IPPROTO_TCP:
532 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
533 if (!tcf_csum_ipv6_tcp(skb,
534 ihl: hl, ipl: pl + sizeof(*ip6h)))
535 goto fail;
536 goto done;
537 case IPPROTO_UDP:
538 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
539 if (!tcf_csum_ipv6_udp(skb, ihl: hl,
540 ipl: pl + sizeof(*ip6h), udplite: 0))
541 goto fail;
542 goto done;
543 case IPPROTO_UDPLITE:
544 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
545 if (!tcf_csum_ipv6_udp(skb, ihl: hl,
546 ipl: pl + sizeof(*ip6h), udplite: 1))
547 goto fail;
548 goto done;
549 case IPPROTO_SCTP:
550 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
551 !tcf_csum_sctp(skb, ihl: hl, ipl: pl + sizeof(*ip6h)))
552 goto fail;
553 goto done;
554 default:
555 goto ignore_skb;
556 }
557 } while (pskb_may_pull(skb, len: hl + 1 + ntkoff));
558
559done:
560ignore_skb:
561 return 1;
562
563fail:
564 return 0;
565}
566
567TC_INDIRECT_SCOPE int tcf_csum_act(struct sk_buff *skb,
568 const struct tc_action *a,
569 struct tcf_result *res)
570{
571 struct tcf_csum *p = to_tcf_csum(a);
572 bool orig_vlan_tag_present = false;
573 unsigned int vlan_hdr_count = 0;
574 struct tcf_csum_params *params;
575 u32 update_flags;
576 __be16 protocol;
577 int action;
578
579 params = rcu_dereference_bh(p->params);
580
581 tcf_lastuse_update(tm: &p->tcf_tm);
582 tcf_action_update_bstats(a: &p->common, skb);
583
584 action = params->action;
585 if (unlikely(action == TC_ACT_SHOT))
586 goto drop;
587
588 update_flags = params->update_flags;
589 protocol = skb_protocol(skb, skip_vlan: false);
590again:
591 switch (protocol) {
592 case cpu_to_be16(ETH_P_IP):
593 if (!tcf_csum_ipv4(skb, update_flags))
594 goto drop;
595 break;
596 case cpu_to_be16(ETH_P_IPV6):
597 if (!tcf_csum_ipv6(skb, update_flags))
598 goto drop;
599 break;
600 case cpu_to_be16(ETH_P_8021AD):
601 fallthrough;
602 case cpu_to_be16(ETH_P_8021Q):
603 if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) {
604 protocol = skb->protocol;
605 orig_vlan_tag_present = true;
606 } else {
607 struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data;
608
609 protocol = vlan->h_vlan_encapsulated_proto;
610 skb_pull(skb, VLAN_HLEN);
611 skb_reset_network_header(skb);
612 vlan_hdr_count++;
613 }
614 goto again;
615 }
616
617out:
618 /* Restore the skb for the pulled VLAN tags */
619 while (vlan_hdr_count--) {
620 skb_push(skb, VLAN_HLEN);
621 skb_reset_network_header(skb);
622 }
623
624 return action;
625
626drop:
627 tcf_action_inc_drop_qstats(a: &p->common);
628 action = TC_ACT_SHOT;
629 goto out;
630}
631
632static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind,
633 int ref)
634{
635 const struct tcf_csum *p = to_tcf_csum(a);
636 unsigned char *b = skb_tail_pointer(skb);
637 const struct tcf_csum_params *params;
638 struct tc_csum opt = {
639 .index = p->tcf_index,
640 .refcnt = refcount_read(r: &p->tcf_refcnt) - ref,
641 .bindcnt = atomic_read(v: &p->tcf_bindcnt) - bind,
642 };
643 struct tcf_t t;
644
645 rcu_read_lock();
646 params = rcu_dereference(p->params);
647 opt.action = params->action;
648 opt.update_flags = params->update_flags;
649
650 if (nla_put(skb, attrtype: TCA_CSUM_PARMS, attrlen: sizeof(opt), data: &opt))
651 goto nla_put_failure;
652
653 tcf_tm_dump(dtm: &t, stm: &p->tcf_tm);
654 if (nla_put_64bit(skb, attrtype: TCA_CSUM_TM, attrlen: sizeof(t), data: &t, padattr: TCA_CSUM_PAD))
655 goto nla_put_failure;
656 rcu_read_unlock();
657
658 return skb->len;
659
660nla_put_failure:
661 rcu_read_unlock();
662 nlmsg_trim(skb, mark: b);
663 return -1;
664}
665
666static void tcf_csum_cleanup(struct tc_action *a)
667{
668 struct tcf_csum *p = to_tcf_csum(a);
669 struct tcf_csum_params *params;
670
671 params = rcu_dereference_protected(p->params, 1);
672 if (params)
673 kfree_rcu(params, rcu);
674}
675
676static size_t tcf_csum_get_fill_size(const struct tc_action *act)
677{
678 return nla_total_size(payload: sizeof(struct tc_csum));
679}
680
681static int tcf_csum_offload_act_setup(struct tc_action *act, void *entry_data,
682 u32 *index_inc, bool bind,
683 struct netlink_ext_ack *extack)
684{
685 if (bind) {
686 struct flow_action_entry *entry = entry_data;
687
688 entry->id = FLOW_ACTION_CSUM;
689 entry->csum_flags = tcf_csum_update_flags(a: act);
690 *index_inc = 1;
691 } else {
692 struct flow_offload_action *fl_action = entry_data;
693
694 fl_action->id = FLOW_ACTION_CSUM;
695 }
696
697 return 0;
698}
699
700static struct tc_action_ops act_csum_ops = {
701 .kind = "csum",
702 .id = TCA_ID_CSUM,
703 .owner = THIS_MODULE,
704 .act = tcf_csum_act,
705 .dump = tcf_csum_dump,
706 .init = tcf_csum_init,
707 .cleanup = tcf_csum_cleanup,
708 .get_fill_size = tcf_csum_get_fill_size,
709 .offload_act_setup = tcf_csum_offload_act_setup,
710 .size = sizeof(struct tcf_csum),
711};
712MODULE_ALIAS_NET_ACT("csum");
713
714static __net_init int csum_init_net(struct net *net)
715{
716 struct tc_action_net *tn = net_generic(net, id: act_csum_ops.net_id);
717
718 return tc_action_net_init(net, tn, ops: &act_csum_ops);
719}
720
721static void __net_exit csum_exit_net(struct list_head *net_list)
722{
723 tc_action_net_exit(net_list, id: act_csum_ops.net_id);
724}
725
726static struct pernet_operations csum_net_ops = {
727 .init = csum_init_net,
728 .exit_batch = csum_exit_net,
729 .id = &act_csum_ops.net_id,
730 .size = sizeof(struct tc_action_net),
731};
732
733MODULE_DESCRIPTION("Checksum updating actions");
734MODULE_LICENSE("GPL");
735
736static int __init csum_init_module(void)
737{
738 return tcf_register_action(a: &act_csum_ops, ops: &csum_net_ops);
739}
740
741static void __exit csum_cleanup_module(void)
742{
743 tcf_unregister_action(a: &act_csum_ops, ops: &csum_net_ops);
744}
745
746module_init(csum_init_module);
747module_exit(csum_cleanup_module);
748

source code of linux/net/sched/act_csum.c