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, 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, 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(tb[TCA_CSUM_PARMS]);
69	index = parm->index;
70	err = tcf_idr_check_alloc(tn, &index, a, bind);
71	if (!err) {
72		ret = tcf_idr_create_from_flags(tn, index, est, a,
73						&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, bind);
84			return -EEXIST;
85		}
86	} else {
87		return err;
88	}
89
90	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, 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
103	spin_lock_bh(&p->tcf_lock);
104	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
105	params_new = rcu_replace_pointer(p->params, params_new,
106					 lockdep_is_held(&p->tcf_lock));
107	spin_unlock_bh(&p->tcf_lock);
108
109	if (goto_ch)
110		tcf_chain_put_by_act(goto_ch);
111	if (params_new)
112		kfree_rcu(params_new, rcu);
113
114	return ret;
115put_chain:
116	if (goto_ch)
117		tcf_chain_put_by_act(goto_ch);
118release_idr:
119	tcf_idr_release(*a, bind);
120	return err;
121}
122
123/**
124 * tcf_csum_skb_nextlayer - Get next layer pointer
125 * @skb: sk_buff to use
126 * @ihl: previous summed headers length
127 * @ipl: complete packet length
128 * @jhl: next header length
129 *
130 * Check the expected next layer availability in the specified sk_buff.
131 * Return the next layer pointer if pass, NULL otherwise.
132 */
133static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
134				    unsigned int ihl, unsigned int ipl,
135				    unsigned int jhl)
136{
137	int ntkoff = skb_network_offset(skb);
138	int hl = ihl + jhl;
139
140	if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
141	    skb_try_make_writable(skb, hl + ntkoff))
142		return NULL;
143	else
144		return (void *)(skb_network_header(skb) + ihl);
145}
146
147static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
148			      unsigned int ipl)
149{
150	struct icmphdr *icmph;
151
152	icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
153	if (icmph == NULL)
154		return 0;
155
156	icmph->checksum = 0;
157	skb->csum = csum_partial(icmph, ipl - ihl, 0);
158	icmph->checksum = csum_fold(skb->csum);
159
160	skb->ip_summed = CHECKSUM_NONE;
161
162	return 1;
163}
164
165static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
166			      unsigned int ihl, unsigned int ipl)
167{
168	struct igmphdr *igmph;
169
170	igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
171	if (igmph == NULL)
172		return 0;
173
174	igmph->csum = 0;
175	skb->csum = csum_partial(igmph, ipl - ihl, 0);
176	igmph->csum = csum_fold(skb->csum);
177
178	skb->ip_summed = CHECKSUM_NONE;
179
180	return 1;
181}
182
183static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
184			      unsigned int ipl)
185{
186	struct icmp6hdr *icmp6h;
187	const struct ipv6hdr *ip6h;
188
189	icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
190	if (icmp6h == NULL)
191		return 0;
192
193	ip6h = ipv6_hdr(skb);
194	icmp6h->icmp6_cksum = 0;
195	skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
196	icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
197					      ipl - ihl, IPPROTO_ICMPV6,
198					      skb->csum);
199
200	skb->ip_summed = CHECKSUM_NONE;
201
202	return 1;
203}
204
205static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
206			     unsigned int ipl)
207{
208	struct tcphdr *tcph;
209	const struct iphdr *iph;
210
211	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
212		return 1;
213
214	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
215	if (tcph == NULL)
216		return 0;
217
218	iph = ip_hdr(skb);
219	tcph->check = 0;
220	skb->csum = csum_partial(tcph, ipl - ihl, 0);
221	tcph->check = tcp_v4_check(ipl - ihl,
222				   iph->saddr, iph->daddr, skb->csum);
223
224	skb->ip_summed = CHECKSUM_NONE;
225
226	return 1;
227}
228
229static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
230			     unsigned int ipl)
231{
232	struct tcphdr *tcph;
233	const struct ipv6hdr *ip6h;
234
235	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
236		return 1;
237
238	tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
239	if (tcph == NULL)
240		return 0;
241
242	ip6h = ipv6_hdr(skb);
243	tcph->check = 0;
244	skb->csum = csum_partial(tcph, ipl - ihl, 0);
245	tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
246				      ipl - ihl, IPPROTO_TCP,
247				      skb->csum);
248
249	skb->ip_summed = CHECKSUM_NONE;
250
251	return 1;
252}
253
254static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
255			     unsigned int ipl, int udplite)
256{
257	struct udphdr *udph;
258	const struct iphdr *iph;
259	u16 ul;
260
261	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
262		return 1;
263
264	/*
265	 * Support both UDP and UDPLITE checksum algorithms, Don't use
266	 * udph->len to get the real length without any protocol check,
267	 * UDPLITE uses udph->len for another thing,
268	 * Use iph->tot_len, or just ipl.
269	 */
270
271	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
272	if (udph == NULL)
273		return 0;
274
275	iph = ip_hdr(skb);
276	ul = ntohs(udph->len);
277
278	if (udplite || udph->check) {
279
280		udph->check = 0;
281
282		if (udplite) {
283			if (ul == 0)
284				skb->csum = csum_partial(udph, ipl - ihl, 0);
285			else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
286				skb->csum = csum_partial(udph, ul, 0);
287			else
288				goto ignore_obscure_skb;
289		} else {
290			if (ul != ipl - ihl)
291				goto ignore_obscure_skb;
292
293			skb->csum = csum_partial(udph, ul, 0);
294		}
295
296		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
297						ul, iph->protocol,
298						skb->csum);
299
300		if (!udph->check)
301			udph->check = CSUM_MANGLED_0;
302	}
303
304	skb->ip_summed = CHECKSUM_NONE;
305
306ignore_obscure_skb:
307	return 1;
308}
309
310static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
311			     unsigned int ipl, int udplite)
312{
313	struct udphdr *udph;
314	const struct ipv6hdr *ip6h;
315	u16 ul;
316
317	if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
318		return 1;
319
320	/*
321	 * Support both UDP and UDPLITE checksum algorithms, Don't use
322	 * udph->len to get the real length without any protocol check,
323	 * UDPLITE uses udph->len for another thing,
324	 * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
325	 */
326
327	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
328	if (udph == NULL)
329		return 0;
330
331	ip6h = ipv6_hdr(skb);
332	ul = ntohs(udph->len);
333
334	udph->check = 0;
335
336	if (udplite) {
337		if (ul == 0)
338			skb->csum = csum_partial(udph, ipl - ihl, 0);
339
340		else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
341			skb->csum = csum_partial(udph, ul, 0);
342
343		else
344			goto ignore_obscure_skb;
345	} else {
346		if (ul != ipl - ihl)
347			goto ignore_obscure_skb;
348
349		skb->csum = csum_partial(udph, ul, 0);
350	}
351
352	udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
353				      udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
354				      skb->csum);
355
356	if (!udph->check)
357		udph->check = CSUM_MANGLED_0;
358
359	skb->ip_summed = CHECKSUM_NONE;
360
361ignore_obscure_skb:
362	return 1;
363}
364
365static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
366			 unsigned int ipl)
367{
368	struct sctphdr *sctph;
369
370	if (skb_is_gso(skb) && skb_is_gso_sctp(skb))
371		return 1;
372
373	sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
374	if (!sctph)
375		return 0;
376
377	sctph->checksum = sctp_compute_cksum(skb,
378					     skb_network_offset(skb) + ihl);
379	skb_reset_csum_not_inet(skb);
380
381	return 1;
382}
383
384static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
385{
386	const struct iphdr *iph;
387	int ntkoff;
388
389	ntkoff = skb_network_offset(skb);
390
391	if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
392		goto fail;
393
394	iph = ip_hdr(skb);
395
396	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
397	case IPPROTO_ICMP:
398		if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
399			if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
400						ntohs(iph->tot_len)))
401				goto fail;
402		break;
403	case IPPROTO_IGMP:
404		if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
405			if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
406						ntohs(iph->tot_len)))
407				goto fail;
408		break;
409	case IPPROTO_TCP:
410		if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
411			if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
412					       ntohs(iph->tot_len)))
413				goto fail;
414		break;
415	case IPPROTO_UDP:
416		if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
417			if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
418					       ntohs(iph->tot_len), 0))
419				goto fail;
420		break;
421	case IPPROTO_UDPLITE:
422		if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
423			if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
424					       ntohs(iph->tot_len), 1))
425				goto fail;
426		break;
427	case IPPROTO_SCTP:
428		if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
429		    !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
430			goto fail;
431		break;
432	}
433
434	if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
435		if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff))
436			goto fail;
437
438		ip_send_check(ip_hdr(skb));
439	}
440
441	return 1;
442
443fail:
444	return 0;
445}
446
447static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
448				 unsigned int *pl)
449{
450	int off, len, optlen;
451	unsigned char *xh = (void *)ip6xh;
452
453	off = sizeof(*ip6xh);
454	len = ixhl - off;
455
456	while (len > 1) {
457		switch (xh[off]) {
458		case IPV6_TLV_PAD1:
459			optlen = 1;
460			break;
461		case IPV6_TLV_JUMBO:
462			optlen = xh[off + 1] + 2;
463			if (optlen != 6 || len < 6 || (off & 3) != 2)
464				/* wrong jumbo option length/alignment */
465				return 0;
466			*pl = ntohl(*(__be32 *)(xh + off + 2));
467			goto done;
468		default:
469			optlen = xh[off + 1] + 2;
470			if (optlen > len)
471				/* ignore obscure options */
472				goto done;
473			break;
474		}
475		off += optlen;
476		len -= optlen;
477	}
478
479done:
480	return 1;
481}
482
483static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
484{
485	struct ipv6hdr *ip6h;
486	struct ipv6_opt_hdr *ip6xh;
487	unsigned int hl, ixhl;
488	unsigned int pl;
489	int ntkoff;
490	u8 nexthdr;
491
492	ntkoff = skb_network_offset(skb);
493
494	hl = sizeof(*ip6h);
495
496	if (!pskb_may_pull(skb, hl + ntkoff))
497		goto fail;
498
499	ip6h = ipv6_hdr(skb);
500
501	pl = ntohs(ip6h->payload_len);
502	nexthdr = ip6h->nexthdr;
503
504	do {
505		switch (nexthdr) {
506		case NEXTHDR_FRAGMENT:
507			goto ignore_skb;
508		case NEXTHDR_ROUTING:
509		case NEXTHDR_HOP:
510		case NEXTHDR_DEST:
511			if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
512				goto fail;
513			ip6xh = (void *)(skb_network_header(skb) + hl);
514			ixhl = ipv6_optlen(ip6xh);
515			if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
516				goto fail;
517			ip6xh = (void *)(skb_network_header(skb) + hl);
518			if ((nexthdr == NEXTHDR_HOP) &&
519			    !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
520				goto fail;
521			nexthdr = ip6xh->nexthdr;
522			hl += ixhl;
523			break;
524		case IPPROTO_ICMPV6:
525			if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
526				if (!tcf_csum_ipv6_icmp(skb,
527							hl, pl + sizeof(*ip6h)))
528					goto fail;
529			goto done;
530		case IPPROTO_TCP:
531			if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
532				if (!tcf_csum_ipv6_tcp(skb,
533						       hl, pl + sizeof(*ip6h)))
534					goto fail;
535			goto done;
536		case IPPROTO_UDP:
537			if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
538				if (!tcf_csum_ipv6_udp(skb, hl,
539						       pl + sizeof(*ip6h), 0))
540					goto fail;
541			goto done;
542		case IPPROTO_UDPLITE:
543			if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
544				if (!tcf_csum_ipv6_udp(skb, hl,
545						       pl + sizeof(*ip6h), 1))
546					goto fail;
547			goto done;
548		case IPPROTO_SCTP:
549			if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
550			    !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
551				goto fail;
552			goto done;
553		default:
554			goto ignore_skb;
555		}
556	} while (pskb_may_pull(skb, hl + 1 + ntkoff));
557
558done:
559ignore_skb:
560	return 1;
561
562fail:
563	return 0;
564}
565
566TC_INDIRECT_SCOPE int tcf_csum_act(struct sk_buff *skb,
567				   const struct tc_action *a,
568				   struct tcf_result *res)
569{
570	struct tcf_csum *p = to_tcf_csum(a);
571	bool orig_vlan_tag_present = false;
572	unsigned int vlan_hdr_count = 0;
573	struct tcf_csum_params *params;
574	u32 update_flags;
575	__be16 protocol;
576	int action;
577
578	params = rcu_dereference_bh(p->params);
579
580	tcf_lastuse_update(&p->tcf_tm);
581	tcf_action_update_bstats(&p->common, skb);
582
583	action = READ_ONCE(p->tcf_action);
584	if (unlikely(action == TC_ACT_SHOT))
585		goto drop;
586
587	update_flags = params->update_flags;
588	protocol = skb_protocol(skb, false);
589again:
590	switch (protocol) {
591	case cpu_to_be16(ETH_P_IP):
592		if (!tcf_csum_ipv4(skb, update_flags))
593			goto drop;
594		break;
595	case cpu_to_be16(ETH_P_IPV6):
596		if (!tcf_csum_ipv6(skb, update_flags))
597			goto drop;
598		break;
599	case cpu_to_be16(ETH_P_8021AD):
600		fallthrough;
601	case cpu_to_be16(ETH_P_8021Q):
602		if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) {
603			protocol = skb->protocol;
604			orig_vlan_tag_present = true;
605		} else {
606			struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data;
607
608			protocol = vlan->h_vlan_encapsulated_proto;
609			skb_pull(skb, VLAN_HLEN);
610			skb_reset_network_header(skb);
611			vlan_hdr_count++;
612		}
613		goto again;
614	}
615
616out:
617	/* Restore the skb for the pulled VLAN tags */
618	while (vlan_hdr_count--) {
619		skb_push(skb, VLAN_HLEN);
620		skb_reset_network_header(skb);
621	}
622
623	return action;
624
625drop:
626	tcf_action_inc_drop_qstats(&p->common);
627	action = TC_ACT_SHOT;
628	goto out;
629}
630
631static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind,
632			 int ref)
633{
634	unsigned char *b = skb_tail_pointer(skb);
635	struct tcf_csum *p = to_tcf_csum(a);
636	struct tcf_csum_params *params;
637	struct tc_csum opt = {
638		.index   = p->tcf_index,
639		.refcnt  = refcount_read(&p->tcf_refcnt) - ref,
640		.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
641	};
642	struct tcf_t t;
643
644	spin_lock_bh(&p->tcf_lock);
645	params = rcu_dereference_protected(p->params,
646					   lockdep_is_held(&p->tcf_lock));
647	opt.action = p->tcf_action;
648	opt.update_flags = params->update_flags;
649
650	if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
651		goto nla_put_failure;
652
653	tcf_tm_dump(&t, &p->tcf_tm);
654	if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD))
655		goto nla_put_failure;
656	spin_unlock_bh(&p->tcf_lock);
657
658	return skb->len;
659
660nla_put_failure:
661	spin_unlock_bh(&p->tcf_lock);
662	nlmsg_trim(skb, 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(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(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, act_csum_ops.net_id);
717
718	return tc_action_net_init(net, tn, &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, 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(&act_csum_ops, &csum_net_ops);
739}
740
741static void __exit csum_cleanup_module(void)
742{
743	tcf_unregister_action(&act_csum_ops, &csum_net_ops);
744}
745
746module_init(csum_init_module);
747module_exit(csum_cleanup_module);
748