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 | |
eb4d4065 GB |
40 | |
41 | static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { | |
42 | [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, | |
43 | }; | |
44 | ||
c1b52739 | 45 | static int tcf_csum_init(struct net *n, struct nlattr *nla, struct nlattr *est, |
eb4d4065 GB |
46 | struct tc_action *a, int ovr, int bind) |
47 | { | |
48 | struct nlattr *tb[TCA_CSUM_MAX + 1]; | |
49 | struct tc_csum *parm; | |
eb4d4065 GB |
50 | struct tcf_csum *p; |
51 | int ret = 0, err; | |
52 | ||
53 | if (nla == NULL) | |
54 | return -EINVAL; | |
55 | ||
cc7ec456 | 56 | err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy); |
eb4d4065 GB |
57 | if (err < 0) |
58 | return err; | |
59 | ||
60 | if (tb[TCA_CSUM_PARMS] == NULL) | |
61 | return -EINVAL; | |
62 | parm = nla_data(tb[TCA_CSUM_PARMS]); | |
63 | ||
86062033 WC |
64 | if (!tcf_hash_check(parm->index, a, bind)) { |
65 | ret = tcf_hash_create(parm->index, est, a, sizeof(*p), bind); | |
66 | if (ret) | |
67 | return ret; | |
eb4d4065 GB |
68 | ret = ACT_P_CREATED; |
69 | } else { | |
1a29321e JHS |
70 | if (bind)/* dont override defaults */ |
71 | return 0; | |
86062033 | 72 | tcf_hash_release(a, bind); |
1a29321e | 73 | if (!ovr) |
eb4d4065 | 74 | return -EEXIST; |
eb4d4065 GB |
75 | } |
76 | ||
86062033 | 77 | p = to_tcf_csum(a); |
eb4d4065 GB |
78 | spin_lock_bh(&p->tcf_lock); |
79 | p->tcf_action = parm->action; | |
80 | p->update_flags = parm->update_flags; | |
81 | spin_unlock_bh(&p->tcf_lock); | |
82 | ||
83 | if (ret == ACT_P_CREATED) | |
86062033 | 84 | tcf_hash_insert(a); |
eb4d4065 GB |
85 | |
86 | return ret; | |
87 | } | |
88 | ||
eb4d4065 GB |
89 | /** |
90 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
91 | * @skb: sk_buff to use | |
92 | * @ihl: previous summed headers length | |
93 | * @ipl: complete packet length | |
94 | * @jhl: next header length | |
95 | * | |
96 | * Check the expected next layer availability in the specified sk_buff. | |
97 | * Return the next layer pointer if pass, NULL otherwise. | |
98 | */ | |
99 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
100 | unsigned int ihl, unsigned int ipl, | |
101 | unsigned int jhl) | |
102 | { | |
103 | int ntkoff = skb_network_offset(skb); | |
104 | int hl = ihl + jhl; | |
105 | ||
106 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
107 | (skb_cloned(skb) && | |
108 | !skb_clone_writable(skb, hl + ntkoff) && | |
109 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
110 | return NULL; | |
111 | else | |
112 | return (void *)(skb_network_header(skb) + ihl); | |
113 | } | |
114 | ||
115 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, | |
116 | unsigned int ihl, unsigned int ipl) | |
117 | { | |
118 | struct icmphdr *icmph; | |
119 | ||
120 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
121 | if (icmph == NULL) | |
122 | return 0; | |
123 | ||
124 | icmph->checksum = 0; | |
125 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
126 | icmph->checksum = csum_fold(skb->csum); | |
127 | ||
128 | skb->ip_summed = CHECKSUM_NONE; | |
129 | ||
130 | return 1; | |
131 | } | |
132 | ||
133 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
134 | unsigned int ihl, unsigned int ipl) | |
135 | { | |
136 | struct igmphdr *igmph; | |
137 | ||
138 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
139 | if (igmph == NULL) | |
140 | return 0; | |
141 | ||
142 | igmph->csum = 0; | |
143 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
144 | igmph->csum = csum_fold(skb->csum); | |
145 | ||
146 | skb->ip_summed = CHECKSUM_NONE; | |
147 | ||
148 | return 1; | |
149 | } | |
150 | ||
d14a489a | 151 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, |
eb4d4065 GB |
152 | unsigned int ihl, unsigned int ipl) |
153 | { | |
154 | struct icmp6hdr *icmp6h; | |
d14a489a | 155 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
156 | |
157 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
158 | if (icmp6h == NULL) | |
159 | return 0; | |
160 | ||
d14a489a | 161 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
162 | icmp6h->icmp6_cksum = 0; |
163 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
164 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
165 | ipl - ihl, IPPROTO_ICMPV6, | |
166 | skb->csum); | |
167 | ||
168 | skb->ip_summed = CHECKSUM_NONE; | |
169 | ||
170 | return 1; | |
171 | } | |
172 | ||
d14a489a | 173 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, |
eb4d4065 GB |
174 | unsigned int ihl, unsigned int ipl) |
175 | { | |
176 | struct tcphdr *tcph; | |
d14a489a | 177 | const struct iphdr *iph; |
eb4d4065 GB |
178 | |
179 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
180 | if (tcph == NULL) | |
181 | return 0; | |
182 | ||
d14a489a | 183 | iph = ip_hdr(skb); |
eb4d4065 GB |
184 | tcph->check = 0; |
185 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
186 | tcph->check = tcp_v4_check(ipl - ihl, | |
187 | iph->saddr, iph->daddr, skb->csum); | |
188 | ||
189 | skb->ip_summed = CHECKSUM_NONE; | |
190 | ||
191 | return 1; | |
192 | } | |
193 | ||
d14a489a | 194 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, |
eb4d4065 GB |
195 | unsigned int ihl, unsigned int ipl) |
196 | { | |
197 | struct tcphdr *tcph; | |
d14a489a | 198 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
199 | |
200 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
201 | if (tcph == NULL) | |
202 | return 0; | |
203 | ||
d14a489a | 204 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
205 | tcph->check = 0; |
206 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
207 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
208 | ipl - ihl, IPPROTO_TCP, | |
209 | skb->csum); | |
210 | ||
211 | skb->ip_summed = CHECKSUM_NONE; | |
212 | ||
213 | return 1; | |
214 | } | |
215 | ||
d14a489a | 216 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, |
eb4d4065 GB |
217 | unsigned int ihl, unsigned int ipl, int udplite) |
218 | { | |
219 | struct udphdr *udph; | |
d14a489a | 220 | const struct iphdr *iph; |
eb4d4065 GB |
221 | u16 ul; |
222 | ||
0eec32ff CG |
223 | /* |
224 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
225 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
226 | * UDPLITE uses udph->len for another thing, |
227 | * Use iph->tot_len, or just ipl. | |
228 | */ | |
229 | ||
230 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
231 | if (udph == NULL) | |
232 | return 0; | |
233 | ||
d14a489a | 234 | iph = ip_hdr(skb); |
eb4d4065 GB |
235 | ul = ntohs(udph->len); |
236 | ||
237 | if (udplite || udph->check) { | |
238 | ||
239 | udph->check = 0; | |
240 | ||
241 | if (udplite) { | |
242 | if (ul == 0) | |
243 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
244 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
245 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
246 | else |
247 | goto ignore_obscure_skb; | |
248 | } else { | |
249 | if (ul != ipl - ihl) | |
250 | goto ignore_obscure_skb; | |
251 | ||
252 | skb->csum = csum_partial(udph, ul, 0); | |
253 | } | |
254 | ||
255 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
256 | ul, iph->protocol, | |
257 | skb->csum); | |
258 | ||
259 | if (!udph->check) | |
260 | udph->check = CSUM_MANGLED_0; | |
261 | } | |
262 | ||
263 | skb->ip_summed = CHECKSUM_NONE; | |
264 | ||
265 | ignore_obscure_skb: | |
266 | return 1; | |
267 | } | |
268 | ||
d14a489a | 269 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, |
eb4d4065 GB |
270 | unsigned int ihl, unsigned int ipl, int udplite) |
271 | { | |
272 | struct udphdr *udph; | |
d14a489a | 273 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
274 | u16 ul; |
275 | ||
0eec32ff CG |
276 | /* |
277 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
278 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
279 | * UDPLITE uses udph->len for another thing, |
280 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
281 | */ | |
282 | ||
283 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
284 | if (udph == NULL) | |
285 | return 0; | |
286 | ||
d14a489a | 287 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
288 | ul = ntohs(udph->len); |
289 | ||
290 | udph->check = 0; | |
291 | ||
292 | if (udplite) { | |
293 | if (ul == 0) | |
294 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
295 | ||
296 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
297 | skb->csum = csum_partial(udph, ul, 0); | |
298 | ||
299 | else | |
300 | goto ignore_obscure_skb; | |
301 | } else { | |
302 | if (ul != ipl - ihl) | |
303 | goto ignore_obscure_skb; | |
304 | ||
305 | skb->csum = csum_partial(udph, ul, 0); | |
306 | } | |
307 | ||
308 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
309 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
310 | skb->csum); | |
311 | ||
312 | if (!udph->check) | |
313 | udph->check = CSUM_MANGLED_0; | |
314 | ||
315 | skb->ip_summed = CHECKSUM_NONE; | |
316 | ||
317 | ignore_obscure_skb: | |
318 | return 1; | |
319 | } | |
320 | ||
321 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) | |
322 | { | |
d14a489a | 323 | const struct iphdr *iph; |
eb4d4065 GB |
324 | int ntkoff; |
325 | ||
326 | ntkoff = skb_network_offset(skb); | |
327 | ||
328 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
329 | goto fail; | |
330 | ||
331 | iph = ip_hdr(skb); | |
332 | ||
333 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
334 | case IPPROTO_ICMP: | |
335 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
336 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
337 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
338 | goto fail; |
339 | break; | |
340 | case IPPROTO_IGMP: | |
341 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
342 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
343 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
344 | goto fail; |
345 | break; | |
346 | case IPPROTO_TCP: | |
347 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 348 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 349 | ntohs(iph->tot_len))) |
eb4d4065 GB |
350 | goto fail; |
351 | break; | |
352 | case IPPROTO_UDP: | |
353 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 354 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 355 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
356 | goto fail; |
357 | break; | |
358 | case IPPROTO_UDPLITE: | |
359 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 360 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 361 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
362 | goto fail; |
363 | break; | |
364 | } | |
365 | ||
366 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
367 | if (skb_cloned(skb) && | |
368 | !skb_clone_writable(skb, sizeof(*iph) + ntkoff) && | |
369 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
370 | goto fail; | |
371 | ||
d14a489a | 372 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
373 | } |
374 | ||
375 | return 1; | |
376 | ||
377 | fail: | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, | |
0eec32ff | 382 | unsigned int ixhl, unsigned int *pl) |
eb4d4065 GB |
383 | { |
384 | int off, len, optlen; | |
385 | unsigned char *xh = (void *)ip6xh; | |
386 | ||
387 | off = sizeof(*ip6xh); | |
388 | len = ixhl - off; | |
389 | ||
390 | while (len > 1) { | |
0eec32ff | 391 | switch (xh[off]) { |
1de5a71c | 392 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
393 | optlen = 1; |
394 | break; | |
395 | case IPV6_TLV_JUMBO: | |
396 | optlen = xh[off + 1] + 2; | |
397 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
398 | /* wrong jumbo option length/alignment */ | |
399 | return 0; | |
400 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
401 | goto done; | |
402 | default: | |
403 | optlen = xh[off + 1] + 2; | |
404 | if (optlen > len) | |
405 | /* ignore obscure options */ | |
406 | goto done; | |
407 | break; | |
408 | } | |
409 | off += optlen; | |
410 | len -= optlen; | |
411 | } | |
412 | ||
413 | done: | |
414 | return 1; | |
415 | } | |
416 | ||
417 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
418 | { | |
419 | struct ipv6hdr *ip6h; | |
420 | struct ipv6_opt_hdr *ip6xh; | |
421 | unsigned int hl, ixhl; | |
422 | unsigned int pl; | |
423 | int ntkoff; | |
424 | u8 nexthdr; | |
425 | ||
426 | ntkoff = skb_network_offset(skb); | |
427 | ||
428 | hl = sizeof(*ip6h); | |
429 | ||
430 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
431 | goto fail; | |
432 | ||
433 | ip6h = ipv6_hdr(skb); | |
434 | ||
435 | pl = ntohs(ip6h->payload_len); | |
436 | nexthdr = ip6h->nexthdr; | |
437 | ||
438 | do { | |
439 | switch (nexthdr) { | |
440 | case NEXTHDR_FRAGMENT: | |
441 | goto ignore_skb; | |
442 | case NEXTHDR_ROUTING: | |
443 | case NEXTHDR_HOP: | |
444 | case NEXTHDR_DEST: | |
445 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
446 | goto fail; | |
447 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
448 | ixhl = ipv6_optlen(ip6xh); | |
449 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
450 | goto fail; | |
d14a489a | 451 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
452 | if ((nexthdr == NEXTHDR_HOP) && |
453 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
454 | goto fail; | |
455 | nexthdr = ip6xh->nexthdr; | |
456 | hl += ixhl; | |
457 | break; | |
458 | case IPPROTO_ICMPV6: | |
459 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 460 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
461 | hl, pl + sizeof(*ip6h))) |
462 | goto fail; | |
463 | goto done; | |
464 | case IPPROTO_TCP: | |
465 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 466 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
467 | hl, pl + sizeof(*ip6h))) |
468 | goto fail; | |
469 | goto done; | |
470 | case IPPROTO_UDP: | |
471 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 472 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 473 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
474 | goto fail; |
475 | goto done; | |
476 | case IPPROTO_UDPLITE: | |
477 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 478 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 479 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
480 | goto fail; |
481 | goto done; | |
482 | default: | |
483 | goto ignore_skb; | |
484 | } | |
485 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
486 | ||
487 | done: | |
488 | ignore_skb: | |
489 | return 1; | |
490 | ||
491 | fail: | |
492 | return 0; | |
493 | } | |
494 | ||
495 | static int tcf_csum(struct sk_buff *skb, | |
dc7f9f6e | 496 | const struct tc_action *a, struct tcf_result *res) |
eb4d4065 GB |
497 | { |
498 | struct tcf_csum *p = a->priv; | |
499 | int action; | |
500 | u32 update_flags; | |
501 | ||
502 | spin_lock(&p->tcf_lock); | |
503 | p->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 504 | bstats_update(&p->tcf_bstats, skb); |
eb4d4065 GB |
505 | action = p->tcf_action; |
506 | update_flags = p->update_flags; | |
507 | spin_unlock(&p->tcf_lock); | |
508 | ||
509 | if (unlikely(action == TC_ACT_SHOT)) | |
510 | goto drop; | |
511 | ||
d8b9605d | 512 | switch (tc_skb_protocol(skb)) { |
eb4d4065 GB |
513 | case cpu_to_be16(ETH_P_IP): |
514 | if (!tcf_csum_ipv4(skb, update_flags)) | |
515 | goto drop; | |
516 | break; | |
517 | case cpu_to_be16(ETH_P_IPV6): | |
518 | if (!tcf_csum_ipv6(skb, update_flags)) | |
519 | goto drop; | |
520 | break; | |
521 | } | |
522 | ||
523 | return action; | |
524 | ||
525 | drop: | |
526 | spin_lock(&p->tcf_lock); | |
527 | p->tcf_qstats.drops++; | |
528 | spin_unlock(&p->tcf_lock); | |
529 | return TC_ACT_SHOT; | |
530 | } | |
531 | ||
532 | static int tcf_csum_dump(struct sk_buff *skb, | |
533 | struct tc_action *a, int bind, int ref) | |
534 | { | |
535 | unsigned char *b = skb_tail_pointer(skb); | |
536 | struct tcf_csum *p = a->priv; | |
537 | struct tc_csum opt = { | |
538 | .update_flags = p->update_flags, | |
eb4d4065 GB |
539 | .index = p->tcf_index, |
540 | .action = p->tcf_action, | |
541 | .refcnt = p->tcf_refcnt - ref, | |
542 | .bindcnt = p->tcf_bindcnt - bind, | |
543 | }; | |
544 | struct tcf_t t; | |
545 | ||
1b34ec43 DM |
546 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
547 | goto nla_put_failure; | |
eb4d4065 GB |
548 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
549 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
550 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
1b34ec43 DM |
551 | if (nla_put(skb, TCA_CSUM_TM, sizeof(t), &t)) |
552 | goto nla_put_failure; | |
eb4d4065 GB |
553 | |
554 | return skb->len; | |
555 | ||
556 | nla_put_failure: | |
557 | nlmsg_trim(skb, b); | |
558 | return -1; | |
559 | } | |
560 | ||
561 | static struct tc_action_ops act_csum_ops = { | |
0eec32ff | 562 | .kind = "csum", |
0eec32ff | 563 | .type = TCA_ACT_CSUM, |
0eec32ff CG |
564 | .owner = THIS_MODULE, |
565 | .act = tcf_csum, | |
566 | .dump = tcf_csum_dump, | |
0eec32ff | 567 | .init = tcf_csum_init, |
eb4d4065 GB |
568 | }; |
569 | ||
570 | MODULE_DESCRIPTION("Checksum updating actions"); | |
571 | MODULE_LICENSE("GPL"); | |
572 | ||
573 | static int __init csum_init_module(void) | |
574 | { | |
4f1e9d89 | 575 | return tcf_register_action(&act_csum_ops, CSUM_TAB_MASK); |
eb4d4065 GB |
576 | } |
577 | ||
578 | static void __exit csum_cleanup_module(void) | |
579 | { | |
580 | tcf_unregister_action(&act_csum_ops); | |
581 | } | |
582 | ||
583 | module_init(csum_init_module); | |
584 | module_exit(csum_cleanup_module); |