Commit | Line | Data |
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eb4d4065 GB |
1 | /* |
2 | * Checksum updating actions | |
3 | * | |
4 | * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/spinlock.h> | |
18 | ||
19 | #include <linux/netlink.h> | |
20 | #include <net/netlink.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | ||
23 | #include <linux/skbuff.h> | |
24 | ||
25 | #include <net/ip.h> | |
26 | #include <net/ipv6.h> | |
27 | #include <net/icmp.h> | |
28 | #include <linux/icmpv6.h> | |
29 | #include <linux/igmp.h> | |
30 | #include <net/tcp.h> | |
31 | #include <net/udp.h> | |
2436243a | 32 | #include <net/ip6_checksum.h> |
eb4d4065 GB |
33 | |
34 | #include <net/act_api.h> | |
35 | ||
36 | #include <linux/tc_act/tc_csum.h> | |
37 | #include <net/tc_act/tc_csum.h> | |
38 | ||
39 | #define CSUM_TAB_MASK 15 | |
40 | static struct tcf_common *tcf_csum_ht[CSUM_TAB_MASK + 1]; | |
41 | static u32 csum_idx_gen; | |
42 | static DEFINE_RWLOCK(csum_lock); | |
43 | ||
44 | static struct tcf_hashinfo csum_hash_info = { | |
0eec32ff CG |
45 | .htab = tcf_csum_ht, |
46 | .hmask = CSUM_TAB_MASK, | |
47 | .lock = &csum_lock, | |
eb4d4065 GB |
48 | }; |
49 | ||
50 | static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { | |
51 | [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, | |
52 | }; | |
53 | ||
54 | static int tcf_csum_init(struct nlattr *nla, struct nlattr *est, | |
55 | struct tc_action *a, int ovr, int bind) | |
56 | { | |
57 | struct nlattr *tb[TCA_CSUM_MAX + 1]; | |
58 | struct tc_csum *parm; | |
59 | struct tcf_common *pc; | |
60 | struct tcf_csum *p; | |
61 | int ret = 0, err; | |
62 | ||
63 | if (nla == NULL) | |
64 | return -EINVAL; | |
65 | ||
66 | err = nla_parse_nested(tb, TCA_CSUM_MAX, nla,csum_policy); | |
67 | if (err < 0) | |
68 | return err; | |
69 | ||
70 | if (tb[TCA_CSUM_PARMS] == NULL) | |
71 | return -EINVAL; | |
72 | parm = nla_data(tb[TCA_CSUM_PARMS]); | |
73 | ||
74 | pc = tcf_hash_check(parm->index, a, bind, &csum_hash_info); | |
75 | if (!pc) { | |
0eec32ff CG |
76 | pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind, |
77 | &csum_idx_gen, &csum_hash_info); | |
eb4d4065 GB |
78 | if (IS_ERR(pc)) |
79 | return PTR_ERR(pc); | |
80 | p = to_tcf_csum(pc); | |
81 | ret = ACT_P_CREATED; | |
82 | } else { | |
83 | p = to_tcf_csum(pc); | |
84 | if (!ovr) { | |
85 | tcf_hash_release(pc, bind, &csum_hash_info); | |
86 | return -EEXIST; | |
87 | } | |
88 | } | |
89 | ||
90 | spin_lock_bh(&p->tcf_lock); | |
91 | p->tcf_action = parm->action; | |
92 | p->update_flags = parm->update_flags; | |
93 | spin_unlock_bh(&p->tcf_lock); | |
94 | ||
95 | if (ret == ACT_P_CREATED) | |
96 | tcf_hash_insert(pc, &csum_hash_info); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | static int tcf_csum_cleanup(struct tc_action *a, int bind) | |
102 | { | |
103 | struct tcf_csum *p = a->priv; | |
104 | return tcf_hash_release(&p->common, bind, &csum_hash_info); | |
105 | } | |
106 | ||
107 | /** | |
108 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
109 | * @skb: sk_buff to use | |
110 | * @ihl: previous summed headers length | |
111 | * @ipl: complete packet length | |
112 | * @jhl: next header length | |
113 | * | |
114 | * Check the expected next layer availability in the specified sk_buff. | |
115 | * Return the next layer pointer if pass, NULL otherwise. | |
116 | */ | |
117 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
118 | unsigned int ihl, unsigned int ipl, | |
119 | unsigned int jhl) | |
120 | { | |
121 | int ntkoff = skb_network_offset(skb); | |
122 | int hl = ihl + jhl; | |
123 | ||
124 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
125 | (skb_cloned(skb) && | |
126 | !skb_clone_writable(skb, hl + ntkoff) && | |
127 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
128 | return NULL; | |
129 | else | |
130 | return (void *)(skb_network_header(skb) + ihl); | |
131 | } | |
132 | ||
133 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, | |
134 | unsigned int ihl, unsigned int ipl) | |
135 | { | |
136 | struct icmphdr *icmph; | |
137 | ||
138 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
139 | if (icmph == NULL) | |
140 | return 0; | |
141 | ||
142 | icmph->checksum = 0; | |
143 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
144 | icmph->checksum = csum_fold(skb->csum); | |
145 | ||
146 | skb->ip_summed = CHECKSUM_NONE; | |
147 | ||
148 | return 1; | |
149 | } | |
150 | ||
151 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
152 | unsigned int ihl, unsigned int ipl) | |
153 | { | |
154 | struct igmphdr *igmph; | |
155 | ||
156 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
157 | if (igmph == NULL) | |
158 | return 0; | |
159 | ||
160 | igmph->csum = 0; | |
161 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
162 | igmph->csum = csum_fold(skb->csum); | |
163 | ||
164 | skb->ip_summed = CHECKSUM_NONE; | |
165 | ||
166 | return 1; | |
167 | } | |
168 | ||
169 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, struct ipv6hdr *ip6h, | |
170 | unsigned int ihl, unsigned int ipl) | |
171 | { | |
172 | struct icmp6hdr *icmp6h; | |
173 | ||
174 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
175 | if (icmp6h == NULL) | |
176 | return 0; | |
177 | ||
178 | icmp6h->icmp6_cksum = 0; | |
179 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
180 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
181 | ipl - ihl, IPPROTO_ICMPV6, | |
182 | skb->csum); | |
183 | ||
184 | skb->ip_summed = CHECKSUM_NONE; | |
185 | ||
186 | return 1; | |
187 | } | |
188 | ||
189 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, struct iphdr *iph, | |
190 | unsigned int ihl, unsigned int ipl) | |
191 | { | |
192 | struct tcphdr *tcph; | |
193 | ||
194 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
195 | if (tcph == NULL) | |
196 | return 0; | |
197 | ||
198 | tcph->check = 0; | |
199 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
200 | tcph->check = tcp_v4_check(ipl - ihl, | |
201 | iph->saddr, iph->daddr, skb->csum); | |
202 | ||
203 | skb->ip_summed = CHECKSUM_NONE; | |
204 | ||
205 | return 1; | |
206 | } | |
207 | ||
208 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, struct ipv6hdr *ip6h, | |
209 | unsigned int ihl, unsigned int ipl) | |
210 | { | |
211 | struct tcphdr *tcph; | |
212 | ||
213 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
214 | if (tcph == NULL) | |
215 | return 0; | |
216 | ||
217 | tcph->check = 0; | |
218 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
219 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
220 | ipl - ihl, IPPROTO_TCP, | |
221 | skb->csum); | |
222 | ||
223 | skb->ip_summed = CHECKSUM_NONE; | |
224 | ||
225 | return 1; | |
226 | } | |
227 | ||
228 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, struct iphdr *iph, | |
229 | unsigned int ihl, unsigned int ipl, int udplite) | |
230 | { | |
231 | struct udphdr *udph; | |
232 | u16 ul; | |
233 | ||
0eec32ff CG |
234 | /* |
235 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
236 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
237 | * UDPLITE uses udph->len for another thing, |
238 | * Use iph->tot_len, or just ipl. | |
239 | */ | |
240 | ||
241 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
242 | if (udph == NULL) | |
243 | return 0; | |
244 | ||
245 | ul = ntohs(udph->len); | |
246 | ||
247 | if (udplite || udph->check) { | |
248 | ||
249 | udph->check = 0; | |
250 | ||
251 | if (udplite) { | |
252 | if (ul == 0) | |
253 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
254 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
255 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
256 | else |
257 | goto ignore_obscure_skb; | |
258 | } else { | |
259 | if (ul != ipl - ihl) | |
260 | goto ignore_obscure_skb; | |
261 | ||
262 | skb->csum = csum_partial(udph, ul, 0); | |
263 | } | |
264 | ||
265 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
266 | ul, iph->protocol, | |
267 | skb->csum); | |
268 | ||
269 | if (!udph->check) | |
270 | udph->check = CSUM_MANGLED_0; | |
271 | } | |
272 | ||
273 | skb->ip_summed = CHECKSUM_NONE; | |
274 | ||
275 | ignore_obscure_skb: | |
276 | return 1; | |
277 | } | |
278 | ||
279 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, struct ipv6hdr *ip6h, | |
280 | unsigned int ihl, unsigned int ipl, int udplite) | |
281 | { | |
282 | struct udphdr *udph; | |
283 | u16 ul; | |
284 | ||
0eec32ff CG |
285 | /* |
286 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
287 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
288 | * UDPLITE uses udph->len for another thing, |
289 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
290 | */ | |
291 | ||
292 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
293 | if (udph == NULL) | |
294 | return 0; | |
295 | ||
296 | ul = ntohs(udph->len); | |
297 | ||
298 | udph->check = 0; | |
299 | ||
300 | if (udplite) { | |
301 | if (ul == 0) | |
302 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
303 | ||
304 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
305 | skb->csum = csum_partial(udph, ul, 0); | |
306 | ||
307 | else | |
308 | goto ignore_obscure_skb; | |
309 | } else { | |
310 | if (ul != ipl - ihl) | |
311 | goto ignore_obscure_skb; | |
312 | ||
313 | skb->csum = csum_partial(udph, ul, 0); | |
314 | } | |
315 | ||
316 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
317 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
318 | skb->csum); | |
319 | ||
320 | if (!udph->check) | |
321 | udph->check = CSUM_MANGLED_0; | |
322 | ||
323 | skb->ip_summed = CHECKSUM_NONE; | |
324 | ||
325 | ignore_obscure_skb: | |
326 | return 1; | |
327 | } | |
328 | ||
329 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) | |
330 | { | |
331 | struct iphdr *iph; | |
332 | int ntkoff; | |
333 | ||
334 | ntkoff = skb_network_offset(skb); | |
335 | ||
336 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
337 | goto fail; | |
338 | ||
339 | iph = ip_hdr(skb); | |
340 | ||
341 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
342 | case IPPROTO_ICMP: | |
343 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
344 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
345 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
346 | goto fail; |
347 | break; | |
348 | case IPPROTO_IGMP: | |
349 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
350 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
351 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
352 | goto fail; |
353 | break; | |
354 | case IPPROTO_TCP: | |
355 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
0eec32ff CG |
356 | if (!tcf_csum_ipv4_tcp(skb, iph, iph->ihl * 4, |
357 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
358 | goto fail; |
359 | break; | |
360 | case IPPROTO_UDP: | |
361 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
0eec32ff CG |
362 | if (!tcf_csum_ipv4_udp(skb, iph, iph->ihl * 4, |
363 | ntohs(iph->tot_len), 0)) | |
eb4d4065 GB |
364 | goto fail; |
365 | break; | |
366 | case IPPROTO_UDPLITE: | |
367 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
0eec32ff CG |
368 | if (!tcf_csum_ipv4_udp(skb, iph, iph->ihl * 4, |
369 | ntohs(iph->tot_len), 1)) | |
eb4d4065 GB |
370 | goto fail; |
371 | break; | |
372 | } | |
373 | ||
374 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
375 | if (skb_cloned(skb) && | |
376 | !skb_clone_writable(skb, sizeof(*iph) + ntkoff) && | |
377 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
378 | goto fail; | |
379 | ||
380 | ip_send_check(iph); | |
381 | } | |
382 | ||
383 | return 1; | |
384 | ||
385 | fail: | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, | |
0eec32ff | 390 | unsigned int ixhl, unsigned int *pl) |
eb4d4065 GB |
391 | { |
392 | int off, len, optlen; | |
393 | unsigned char *xh = (void *)ip6xh; | |
394 | ||
395 | off = sizeof(*ip6xh); | |
396 | len = ixhl - off; | |
397 | ||
398 | while (len > 1) { | |
0eec32ff | 399 | switch (xh[off]) { |
eb4d4065 GB |
400 | case IPV6_TLV_PAD0: |
401 | optlen = 1; | |
402 | break; | |
403 | case IPV6_TLV_JUMBO: | |
404 | optlen = xh[off + 1] + 2; | |
405 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
406 | /* wrong jumbo option length/alignment */ | |
407 | return 0; | |
408 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
409 | goto done; | |
410 | default: | |
411 | optlen = xh[off + 1] + 2; | |
412 | if (optlen > len) | |
413 | /* ignore obscure options */ | |
414 | goto done; | |
415 | break; | |
416 | } | |
417 | off += optlen; | |
418 | len -= optlen; | |
419 | } | |
420 | ||
421 | done: | |
422 | return 1; | |
423 | } | |
424 | ||
425 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
426 | { | |
427 | struct ipv6hdr *ip6h; | |
428 | struct ipv6_opt_hdr *ip6xh; | |
429 | unsigned int hl, ixhl; | |
430 | unsigned int pl; | |
431 | int ntkoff; | |
432 | u8 nexthdr; | |
433 | ||
434 | ntkoff = skb_network_offset(skb); | |
435 | ||
436 | hl = sizeof(*ip6h); | |
437 | ||
438 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
439 | goto fail; | |
440 | ||
441 | ip6h = ipv6_hdr(skb); | |
442 | ||
443 | pl = ntohs(ip6h->payload_len); | |
444 | nexthdr = ip6h->nexthdr; | |
445 | ||
446 | do { | |
447 | switch (nexthdr) { | |
448 | case NEXTHDR_FRAGMENT: | |
449 | goto ignore_skb; | |
450 | case NEXTHDR_ROUTING: | |
451 | case NEXTHDR_HOP: | |
452 | case NEXTHDR_DEST: | |
453 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
454 | goto fail; | |
455 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
456 | ixhl = ipv6_optlen(ip6xh); | |
457 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
458 | goto fail; | |
459 | if ((nexthdr == NEXTHDR_HOP) && | |
460 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
461 | goto fail; | |
462 | nexthdr = ip6xh->nexthdr; | |
463 | hl += ixhl; | |
464 | break; | |
465 | case IPPROTO_ICMPV6: | |
466 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
467 | if (!tcf_csum_ipv6_icmp(skb, ip6h, | |
468 | hl, pl + sizeof(*ip6h))) | |
469 | goto fail; | |
470 | goto done; | |
471 | case IPPROTO_TCP: | |
472 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
473 | if (!tcf_csum_ipv6_tcp(skb, ip6h, | |
474 | hl, pl + sizeof(*ip6h))) | |
475 | goto fail; | |
476 | goto done; | |
477 | case IPPROTO_UDP: | |
478 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
0eec32ff CG |
479 | if (!tcf_csum_ipv6_udp(skb, ip6h, hl, |
480 | pl + sizeof(*ip6h), 0)) | |
eb4d4065 GB |
481 | goto fail; |
482 | goto done; | |
483 | case IPPROTO_UDPLITE: | |
484 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
0eec32ff CG |
485 | if (!tcf_csum_ipv6_udp(skb, ip6h, hl, |
486 | pl + sizeof(*ip6h), 1)) | |
eb4d4065 GB |
487 | goto fail; |
488 | goto done; | |
489 | default: | |
490 | goto ignore_skb; | |
491 | } | |
492 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
493 | ||
494 | done: | |
495 | ignore_skb: | |
496 | return 1; | |
497 | ||
498 | fail: | |
499 | return 0; | |
500 | } | |
501 | ||
502 | static int tcf_csum(struct sk_buff *skb, | |
503 | struct tc_action *a, struct tcf_result *res) | |
504 | { | |
505 | struct tcf_csum *p = a->priv; | |
506 | int action; | |
507 | u32 update_flags; | |
508 | ||
509 | spin_lock(&p->tcf_lock); | |
510 | p->tcf_tm.lastuse = jiffies; | |
511 | p->tcf_bstats.bytes += qdisc_pkt_len(skb); | |
512 | p->tcf_bstats.packets++; | |
513 | action = p->tcf_action; | |
514 | update_flags = p->update_flags; | |
515 | spin_unlock(&p->tcf_lock); | |
516 | ||
517 | if (unlikely(action == TC_ACT_SHOT)) | |
518 | goto drop; | |
519 | ||
520 | switch (skb->protocol) { | |
521 | case cpu_to_be16(ETH_P_IP): | |
522 | if (!tcf_csum_ipv4(skb, update_flags)) | |
523 | goto drop; | |
524 | break; | |
525 | case cpu_to_be16(ETH_P_IPV6): | |
526 | if (!tcf_csum_ipv6(skb, update_flags)) | |
527 | goto drop; | |
528 | break; | |
529 | } | |
530 | ||
531 | return action; | |
532 | ||
533 | drop: | |
534 | spin_lock(&p->tcf_lock); | |
535 | p->tcf_qstats.drops++; | |
536 | spin_unlock(&p->tcf_lock); | |
537 | return TC_ACT_SHOT; | |
538 | } | |
539 | ||
540 | static int tcf_csum_dump(struct sk_buff *skb, | |
541 | struct tc_action *a, int bind, int ref) | |
542 | { | |
543 | unsigned char *b = skb_tail_pointer(skb); | |
544 | struct tcf_csum *p = a->priv; | |
545 | struct tc_csum opt = { | |
546 | .update_flags = p->update_flags, | |
eb4d4065 GB |
547 | .index = p->tcf_index, |
548 | .action = p->tcf_action, | |
549 | .refcnt = p->tcf_refcnt - ref, | |
550 | .bindcnt = p->tcf_bindcnt - bind, | |
551 | }; | |
552 | struct tcf_t t; | |
553 | ||
554 | NLA_PUT(skb, TCA_CSUM_PARMS, sizeof(opt), &opt); | |
555 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); | |
556 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
557 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
558 | NLA_PUT(skb, TCA_CSUM_TM, sizeof(t), &t); | |
559 | ||
560 | return skb->len; | |
561 | ||
562 | nla_put_failure: | |
563 | nlmsg_trim(skb, b); | |
564 | return -1; | |
565 | } | |
566 | ||
567 | static struct tc_action_ops act_csum_ops = { | |
0eec32ff CG |
568 | .kind = "csum", |
569 | .hinfo = &csum_hash_info, | |
570 | .type = TCA_ACT_CSUM, | |
571 | .capab = TCA_CAP_NONE, | |
572 | .owner = THIS_MODULE, | |
573 | .act = tcf_csum, | |
574 | .dump = tcf_csum_dump, | |
575 | .cleanup = tcf_csum_cleanup, | |
576 | .lookup = tcf_hash_search, | |
577 | .init = tcf_csum_init, | |
578 | .walk = tcf_generic_walker | |
eb4d4065 GB |
579 | }; |
580 | ||
581 | MODULE_DESCRIPTION("Checksum updating actions"); | |
582 | MODULE_LICENSE("GPL"); | |
583 | ||
584 | static int __init csum_init_module(void) | |
585 | { | |
586 | return tcf_register_action(&act_csum_ops); | |
587 | } | |
588 | ||
589 | static void __exit csum_cleanup_module(void) | |
590 | { | |
591 | tcf_unregister_action(&act_csum_ops); | |
592 | } | |
593 | ||
594 | module_init(csum_init_module); | |
595 | module_exit(csum_cleanup_module); |