Commit | Line | Data |
---|---|---|
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 | |
369ba567 | 40 | static struct tcf_hashinfo csum_hash_info; |
eb4d4065 GB |
41 | |
42 | static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { | |
43 | [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, | |
44 | }; | |
45 | ||
c1b52739 | 46 | static int tcf_csum_init(struct net *n, struct nlattr *nla, struct nlattr *est, |
eb4d4065 GB |
47 | struct tc_action *a, int ovr, int bind) |
48 | { | |
49 | struct nlattr *tb[TCA_CSUM_MAX + 1]; | |
50 | struct tc_csum *parm; | |
51 | struct tcf_common *pc; | |
52 | struct tcf_csum *p; | |
53 | int ret = 0, err; | |
54 | ||
55 | if (nla == NULL) | |
56 | return -EINVAL; | |
57 | ||
cc7ec456 | 58 | err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy); |
eb4d4065 GB |
59 | if (err < 0) |
60 | return err; | |
61 | ||
62 | if (tb[TCA_CSUM_PARMS] == NULL) | |
63 | return -EINVAL; | |
64 | parm = nla_data(tb[TCA_CSUM_PARMS]); | |
65 | ||
c779f7af | 66 | pc = tcf_hash_check(parm->index, a, bind); |
eb4d4065 | 67 | if (!pc) { |
c779f7af | 68 | pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind); |
eb4d4065 GB |
69 | if (IS_ERR(pc)) |
70 | return PTR_ERR(pc); | |
eb4d4065 GB |
71 | ret = ACT_P_CREATED; |
72 | } else { | |
1a29321e JHS |
73 | if (bind)/* dont override defaults */ |
74 | return 0; | |
c779f7af | 75 | tcf_hash_release(pc, bind, a->ops->hinfo); |
1a29321e | 76 | if (!ovr) |
eb4d4065 | 77 | return -EEXIST; |
eb4d4065 GB |
78 | } |
79 | ||
1a29321e | 80 | p = to_tcf_csum(pc); |
eb4d4065 GB |
81 | spin_lock_bh(&p->tcf_lock); |
82 | p->tcf_action = parm->action; | |
83 | p->update_flags = parm->update_flags; | |
84 | spin_unlock_bh(&p->tcf_lock); | |
85 | ||
86 | if (ret == ACT_P_CREATED) | |
c779f7af | 87 | tcf_hash_insert(pc, a->ops->hinfo); |
eb4d4065 GB |
88 | |
89 | return ret; | |
90 | } | |
91 | ||
92 | static int tcf_csum_cleanup(struct tc_action *a, int bind) | |
93 | { | |
94 | struct tcf_csum *p = a->priv; | |
95 | return tcf_hash_release(&p->common, bind, &csum_hash_info); | |
96 | } | |
97 | ||
98 | /** | |
99 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
100 | * @skb: sk_buff to use | |
101 | * @ihl: previous summed headers length | |
102 | * @ipl: complete packet length | |
103 | * @jhl: next header length | |
104 | * | |
105 | * Check the expected next layer availability in the specified sk_buff. | |
106 | * Return the next layer pointer if pass, NULL otherwise. | |
107 | */ | |
108 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
109 | unsigned int ihl, unsigned int ipl, | |
110 | unsigned int jhl) | |
111 | { | |
112 | int ntkoff = skb_network_offset(skb); | |
113 | int hl = ihl + jhl; | |
114 | ||
115 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
116 | (skb_cloned(skb) && | |
117 | !skb_clone_writable(skb, hl + ntkoff) && | |
118 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
119 | return NULL; | |
120 | else | |
121 | return (void *)(skb_network_header(skb) + ihl); | |
122 | } | |
123 | ||
124 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, | |
125 | unsigned int ihl, unsigned int ipl) | |
126 | { | |
127 | struct icmphdr *icmph; | |
128 | ||
129 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
130 | if (icmph == NULL) | |
131 | return 0; | |
132 | ||
133 | icmph->checksum = 0; | |
134 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
135 | icmph->checksum = csum_fold(skb->csum); | |
136 | ||
137 | skb->ip_summed = CHECKSUM_NONE; | |
138 | ||
139 | return 1; | |
140 | } | |
141 | ||
142 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
143 | unsigned int ihl, unsigned int ipl) | |
144 | { | |
145 | struct igmphdr *igmph; | |
146 | ||
147 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
148 | if (igmph == NULL) | |
149 | return 0; | |
150 | ||
151 | igmph->csum = 0; | |
152 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
153 | igmph->csum = csum_fold(skb->csum); | |
154 | ||
155 | skb->ip_summed = CHECKSUM_NONE; | |
156 | ||
157 | return 1; | |
158 | } | |
159 | ||
d14a489a | 160 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, |
eb4d4065 GB |
161 | unsigned int ihl, unsigned int ipl) |
162 | { | |
163 | struct icmp6hdr *icmp6h; | |
d14a489a | 164 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
165 | |
166 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
167 | if (icmp6h == NULL) | |
168 | return 0; | |
169 | ||
d14a489a | 170 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
171 | icmp6h->icmp6_cksum = 0; |
172 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
173 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
174 | ipl - ihl, IPPROTO_ICMPV6, | |
175 | skb->csum); | |
176 | ||
177 | skb->ip_summed = CHECKSUM_NONE; | |
178 | ||
179 | return 1; | |
180 | } | |
181 | ||
d14a489a | 182 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, |
eb4d4065 GB |
183 | unsigned int ihl, unsigned int ipl) |
184 | { | |
185 | struct tcphdr *tcph; | |
d14a489a | 186 | const struct iphdr *iph; |
eb4d4065 GB |
187 | |
188 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
189 | if (tcph == NULL) | |
190 | return 0; | |
191 | ||
d14a489a | 192 | iph = ip_hdr(skb); |
eb4d4065 GB |
193 | tcph->check = 0; |
194 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
195 | tcph->check = tcp_v4_check(ipl - ihl, | |
196 | iph->saddr, iph->daddr, skb->csum); | |
197 | ||
198 | skb->ip_summed = CHECKSUM_NONE; | |
199 | ||
200 | return 1; | |
201 | } | |
202 | ||
d14a489a | 203 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, |
eb4d4065 GB |
204 | unsigned int ihl, unsigned int ipl) |
205 | { | |
206 | struct tcphdr *tcph; | |
d14a489a | 207 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
208 | |
209 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
210 | if (tcph == NULL) | |
211 | return 0; | |
212 | ||
d14a489a | 213 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
214 | tcph->check = 0; |
215 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
216 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
217 | ipl - ihl, IPPROTO_TCP, | |
218 | skb->csum); | |
219 | ||
220 | skb->ip_summed = CHECKSUM_NONE; | |
221 | ||
222 | return 1; | |
223 | } | |
224 | ||
d14a489a | 225 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, |
eb4d4065 GB |
226 | unsigned int ihl, unsigned int ipl, int udplite) |
227 | { | |
228 | struct udphdr *udph; | |
d14a489a | 229 | const struct iphdr *iph; |
eb4d4065 GB |
230 | u16 ul; |
231 | ||
0eec32ff CG |
232 | /* |
233 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
234 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
235 | * UDPLITE uses udph->len for another thing, |
236 | * Use iph->tot_len, or just ipl. | |
237 | */ | |
238 | ||
239 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
240 | if (udph == NULL) | |
241 | return 0; | |
242 | ||
d14a489a | 243 | iph = ip_hdr(skb); |
eb4d4065 GB |
244 | ul = ntohs(udph->len); |
245 | ||
246 | if (udplite || udph->check) { | |
247 | ||
248 | udph->check = 0; | |
249 | ||
250 | if (udplite) { | |
251 | if (ul == 0) | |
252 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
253 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
254 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
255 | else |
256 | goto ignore_obscure_skb; | |
257 | } else { | |
258 | if (ul != ipl - ihl) | |
259 | goto ignore_obscure_skb; | |
260 | ||
261 | skb->csum = csum_partial(udph, ul, 0); | |
262 | } | |
263 | ||
264 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
265 | ul, iph->protocol, | |
266 | skb->csum); | |
267 | ||
268 | if (!udph->check) | |
269 | udph->check = CSUM_MANGLED_0; | |
270 | } | |
271 | ||
272 | skb->ip_summed = CHECKSUM_NONE; | |
273 | ||
274 | ignore_obscure_skb: | |
275 | return 1; | |
276 | } | |
277 | ||
d14a489a | 278 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, |
eb4d4065 GB |
279 | unsigned int ihl, unsigned int ipl, int udplite) |
280 | { | |
281 | struct udphdr *udph; | |
d14a489a | 282 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
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 | ||
d14a489a | 296 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
297 | ul = ntohs(udph->len); |
298 | ||
299 | udph->check = 0; | |
300 | ||
301 | if (udplite) { | |
302 | if (ul == 0) | |
303 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
304 | ||
305 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
306 | skb->csum = csum_partial(udph, ul, 0); | |
307 | ||
308 | else | |
309 | goto ignore_obscure_skb; | |
310 | } else { | |
311 | if (ul != ipl - ihl) | |
312 | goto ignore_obscure_skb; | |
313 | ||
314 | skb->csum = csum_partial(udph, ul, 0); | |
315 | } | |
316 | ||
317 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
318 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
319 | skb->csum); | |
320 | ||
321 | if (!udph->check) | |
322 | udph->check = CSUM_MANGLED_0; | |
323 | ||
324 | skb->ip_summed = CHECKSUM_NONE; | |
325 | ||
326 | ignore_obscure_skb: | |
327 | return 1; | |
328 | } | |
329 | ||
330 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) | |
331 | { | |
d14a489a | 332 | const struct iphdr *iph; |
eb4d4065 GB |
333 | int ntkoff; |
334 | ||
335 | ntkoff = skb_network_offset(skb); | |
336 | ||
337 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
338 | goto fail; | |
339 | ||
340 | iph = ip_hdr(skb); | |
341 | ||
342 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
343 | case IPPROTO_ICMP: | |
344 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
345 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
346 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
347 | goto fail; |
348 | break; | |
349 | case IPPROTO_IGMP: | |
350 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
351 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
352 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
353 | goto fail; |
354 | break; | |
355 | case IPPROTO_TCP: | |
356 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 357 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 358 | ntohs(iph->tot_len))) |
eb4d4065 GB |
359 | goto fail; |
360 | break; | |
361 | case IPPROTO_UDP: | |
362 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 363 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 364 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
365 | goto fail; |
366 | break; | |
367 | case IPPROTO_UDPLITE: | |
368 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 369 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 370 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
371 | goto fail; |
372 | break; | |
373 | } | |
374 | ||
375 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
376 | if (skb_cloned(skb) && | |
377 | !skb_clone_writable(skb, sizeof(*iph) + ntkoff) && | |
378 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
379 | goto fail; | |
380 | ||
d14a489a | 381 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
382 | } |
383 | ||
384 | return 1; | |
385 | ||
386 | fail: | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, | |
0eec32ff | 391 | unsigned int ixhl, unsigned int *pl) |
eb4d4065 GB |
392 | { |
393 | int off, len, optlen; | |
394 | unsigned char *xh = (void *)ip6xh; | |
395 | ||
396 | off = sizeof(*ip6xh); | |
397 | len = ixhl - off; | |
398 | ||
399 | while (len > 1) { | |
0eec32ff | 400 | switch (xh[off]) { |
1de5a71c | 401 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
402 | optlen = 1; |
403 | break; | |
404 | case IPV6_TLV_JUMBO: | |
405 | optlen = xh[off + 1] + 2; | |
406 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
407 | /* wrong jumbo option length/alignment */ | |
408 | return 0; | |
409 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
410 | goto done; | |
411 | default: | |
412 | optlen = xh[off + 1] + 2; | |
413 | if (optlen > len) | |
414 | /* ignore obscure options */ | |
415 | goto done; | |
416 | break; | |
417 | } | |
418 | off += optlen; | |
419 | len -= optlen; | |
420 | } | |
421 | ||
422 | done: | |
423 | return 1; | |
424 | } | |
425 | ||
426 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
427 | { | |
428 | struct ipv6hdr *ip6h; | |
429 | struct ipv6_opt_hdr *ip6xh; | |
430 | unsigned int hl, ixhl; | |
431 | unsigned int pl; | |
432 | int ntkoff; | |
433 | u8 nexthdr; | |
434 | ||
435 | ntkoff = skb_network_offset(skb); | |
436 | ||
437 | hl = sizeof(*ip6h); | |
438 | ||
439 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
440 | goto fail; | |
441 | ||
442 | ip6h = ipv6_hdr(skb); | |
443 | ||
444 | pl = ntohs(ip6h->payload_len); | |
445 | nexthdr = ip6h->nexthdr; | |
446 | ||
447 | do { | |
448 | switch (nexthdr) { | |
449 | case NEXTHDR_FRAGMENT: | |
450 | goto ignore_skb; | |
451 | case NEXTHDR_ROUTING: | |
452 | case NEXTHDR_HOP: | |
453 | case NEXTHDR_DEST: | |
454 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
455 | goto fail; | |
456 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
457 | ixhl = ipv6_optlen(ip6xh); | |
458 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
459 | goto fail; | |
d14a489a | 460 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
461 | if ((nexthdr == NEXTHDR_HOP) && |
462 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
463 | goto fail; | |
464 | nexthdr = ip6xh->nexthdr; | |
465 | hl += ixhl; | |
466 | break; | |
467 | case IPPROTO_ICMPV6: | |
468 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 469 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
470 | hl, pl + sizeof(*ip6h))) |
471 | goto fail; | |
472 | goto done; | |
473 | case IPPROTO_TCP: | |
474 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 475 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
476 | hl, pl + sizeof(*ip6h))) |
477 | goto fail; | |
478 | goto done; | |
479 | case IPPROTO_UDP: | |
480 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 481 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 482 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
483 | goto fail; |
484 | goto done; | |
485 | case IPPROTO_UDPLITE: | |
486 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 487 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 488 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
489 | goto fail; |
490 | goto done; | |
491 | default: | |
492 | goto ignore_skb; | |
493 | } | |
494 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
495 | ||
496 | done: | |
497 | ignore_skb: | |
498 | return 1; | |
499 | ||
500 | fail: | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static int tcf_csum(struct sk_buff *skb, | |
dc7f9f6e | 505 | const struct tc_action *a, struct tcf_result *res) |
eb4d4065 GB |
506 | { |
507 | struct tcf_csum *p = a->priv; | |
508 | int action; | |
509 | u32 update_flags; | |
510 | ||
511 | spin_lock(&p->tcf_lock); | |
512 | p->tcf_tm.lastuse = jiffies; | |
bfe0d029 | 513 | bstats_update(&p->tcf_bstats, skb); |
eb4d4065 GB |
514 | action = p->tcf_action; |
515 | update_flags = p->update_flags; | |
516 | spin_unlock(&p->tcf_lock); | |
517 | ||
518 | if (unlikely(action == TC_ACT_SHOT)) | |
519 | goto drop; | |
520 | ||
521 | switch (skb->protocol) { | |
522 | case cpu_to_be16(ETH_P_IP): | |
523 | if (!tcf_csum_ipv4(skb, update_flags)) | |
524 | goto drop; | |
525 | break; | |
526 | case cpu_to_be16(ETH_P_IPV6): | |
527 | if (!tcf_csum_ipv6(skb, update_flags)) | |
528 | goto drop; | |
529 | break; | |
530 | } | |
531 | ||
532 | return action; | |
533 | ||
534 | drop: | |
535 | spin_lock(&p->tcf_lock); | |
536 | p->tcf_qstats.drops++; | |
537 | spin_unlock(&p->tcf_lock); | |
538 | return TC_ACT_SHOT; | |
539 | } | |
540 | ||
541 | static int tcf_csum_dump(struct sk_buff *skb, | |
542 | struct tc_action *a, int bind, int ref) | |
543 | { | |
544 | unsigned char *b = skb_tail_pointer(skb); | |
545 | struct tcf_csum *p = a->priv; | |
546 | struct tc_csum opt = { | |
547 | .update_flags = p->update_flags, | |
eb4d4065 GB |
548 | .index = p->tcf_index, |
549 | .action = p->tcf_action, | |
550 | .refcnt = p->tcf_refcnt - ref, | |
551 | .bindcnt = p->tcf_bindcnt - bind, | |
552 | }; | |
553 | struct tcf_t t; | |
554 | ||
1b34ec43 DM |
555 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
556 | goto nla_put_failure; | |
eb4d4065 GB |
557 | t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install); |
558 | t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse); | |
559 | t.expires = jiffies_to_clock_t(p->tcf_tm.expires); | |
1b34ec43 DM |
560 | if (nla_put(skb, TCA_CSUM_TM, sizeof(t), &t)) |
561 | goto nla_put_failure; | |
eb4d4065 GB |
562 | |
563 | return skb->len; | |
564 | ||
565 | nla_put_failure: | |
566 | nlmsg_trim(skb, b); | |
567 | return -1; | |
568 | } | |
569 | ||
570 | static struct tc_action_ops act_csum_ops = { | |
0eec32ff CG |
571 | .kind = "csum", |
572 | .hinfo = &csum_hash_info, | |
573 | .type = TCA_ACT_CSUM, | |
0eec32ff CG |
574 | .owner = THIS_MODULE, |
575 | .act = tcf_csum, | |
576 | .dump = tcf_csum_dump, | |
577 | .cleanup = tcf_csum_cleanup, | |
0eec32ff | 578 | .init = tcf_csum_init, |
eb4d4065 GB |
579 | }; |
580 | ||
581 | MODULE_DESCRIPTION("Checksum updating actions"); | |
582 | MODULE_LICENSE("GPL"); | |
583 | ||
584 | static int __init csum_init_module(void) | |
585 | { | |
568a153a | 586 | int err = tcf_hashinfo_init(&csum_hash_info, CSUM_TAB_MASK); |
369ba567 WC |
587 | if (err) |
588 | return err; | |
589 | ||
eb4d4065 GB |
590 | return tcf_register_action(&act_csum_ops); |
591 | } | |
592 | ||
593 | static void __exit csum_cleanup_module(void) | |
594 | { | |
595 | tcf_unregister_action(&act_csum_ops); | |
596 | } | |
597 | ||
598 | module_init(csum_init_module); | |
599 | module_exit(csum_cleanup_module); |