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 | ||
ddf97ccd | 45 | static int csum_net_id; |
a85a970a | 46 | static struct tc_action_ops act_csum_ops; |
ddf97ccd WC |
47 | |
48 | static int tcf_csum_init(struct net *net, struct nlattr *nla, | |
a85a970a | 49 | struct nlattr *est, struct tc_action **a, int ovr, |
ddf97ccd | 50 | int bind) |
eb4d4065 | 51 | { |
ddf97ccd | 52 | struct tc_action_net *tn = net_generic(net, csum_net_id); |
eb4d4065 GB |
53 | struct nlattr *tb[TCA_CSUM_MAX + 1]; |
54 | struct tc_csum *parm; | |
eb4d4065 GB |
55 | struct tcf_csum *p; |
56 | int ret = 0, err; | |
57 | ||
58 | if (nla == NULL) | |
59 | return -EINVAL; | |
60 | ||
cc7ec456 | 61 | err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy); |
eb4d4065 GB |
62 | if (err < 0) |
63 | return err; | |
64 | ||
65 | if (tb[TCA_CSUM_PARMS] == NULL) | |
66 | return -EINVAL; | |
67 | parm = nla_data(tb[TCA_CSUM_PARMS]); | |
68 | ||
ddf97ccd WC |
69 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
70 | ret = tcf_hash_create(tn, parm->index, est, a, | |
a85a970a | 71 | &act_csum_ops, bind, false); |
86062033 WC |
72 | if (ret) |
73 | return ret; | |
eb4d4065 GB |
74 | ret = ACT_P_CREATED; |
75 | } else { | |
1a29321e JHS |
76 | if (bind)/* dont override defaults */ |
77 | return 0; | |
a85a970a | 78 | tcf_hash_release(*a, bind); |
1a29321e | 79 | if (!ovr) |
eb4d4065 | 80 | return -EEXIST; |
eb4d4065 GB |
81 | } |
82 | ||
a85a970a | 83 | p = to_tcf_csum(*a); |
eb4d4065 GB |
84 | spin_lock_bh(&p->tcf_lock); |
85 | p->tcf_action = parm->action; | |
86 | p->update_flags = parm->update_flags; | |
87 | spin_unlock_bh(&p->tcf_lock); | |
88 | ||
89 | if (ret == ACT_P_CREATED) | |
a85a970a | 90 | tcf_hash_insert(tn, *a); |
eb4d4065 GB |
91 | |
92 | return ret; | |
93 | } | |
94 | ||
eb4d4065 GB |
95 | /** |
96 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
97 | * @skb: sk_buff to use | |
98 | * @ihl: previous summed headers length | |
99 | * @ipl: complete packet length | |
100 | * @jhl: next header length | |
101 | * | |
102 | * Check the expected next layer availability in the specified sk_buff. | |
103 | * Return the next layer pointer if pass, NULL otherwise. | |
104 | */ | |
105 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
106 | unsigned int ihl, unsigned int ipl, | |
107 | unsigned int jhl) | |
108 | { | |
109 | int ntkoff = skb_network_offset(skb); | |
110 | int hl = ihl + jhl; | |
111 | ||
112 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 113 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
114 | return NULL; |
115 | else | |
116 | return (void *)(skb_network_header(skb) + ihl); | |
117 | } | |
118 | ||
119 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, | |
120 | unsigned int ihl, unsigned int ipl) | |
121 | { | |
122 | struct icmphdr *icmph; | |
123 | ||
124 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
125 | if (icmph == NULL) | |
126 | return 0; | |
127 | ||
128 | icmph->checksum = 0; | |
129 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
130 | icmph->checksum = csum_fold(skb->csum); | |
131 | ||
132 | skb->ip_summed = CHECKSUM_NONE; | |
133 | ||
134 | return 1; | |
135 | } | |
136 | ||
137 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
138 | unsigned int ihl, unsigned int ipl) | |
139 | { | |
140 | struct igmphdr *igmph; | |
141 | ||
142 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
143 | if (igmph == NULL) | |
144 | return 0; | |
145 | ||
146 | igmph->csum = 0; | |
147 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
148 | igmph->csum = csum_fold(skb->csum); | |
149 | ||
150 | skb->ip_summed = CHECKSUM_NONE; | |
151 | ||
152 | return 1; | |
153 | } | |
154 | ||
d14a489a | 155 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, |
eb4d4065 GB |
156 | unsigned int ihl, unsigned int ipl) |
157 | { | |
158 | struct icmp6hdr *icmp6h; | |
d14a489a | 159 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
160 | |
161 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
162 | if (icmp6h == NULL) | |
163 | return 0; | |
164 | ||
d14a489a | 165 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
166 | icmp6h->icmp6_cksum = 0; |
167 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
168 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
169 | ipl - ihl, IPPROTO_ICMPV6, | |
170 | skb->csum); | |
171 | ||
172 | skb->ip_summed = CHECKSUM_NONE; | |
173 | ||
174 | return 1; | |
175 | } | |
176 | ||
d14a489a | 177 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, |
eb4d4065 GB |
178 | unsigned int ihl, unsigned int ipl) |
179 | { | |
180 | struct tcphdr *tcph; | |
d14a489a | 181 | const struct iphdr *iph; |
eb4d4065 GB |
182 | |
183 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
184 | if (tcph == NULL) | |
185 | return 0; | |
186 | ||
d14a489a | 187 | iph = ip_hdr(skb); |
eb4d4065 GB |
188 | tcph->check = 0; |
189 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
190 | tcph->check = tcp_v4_check(ipl - ihl, | |
191 | iph->saddr, iph->daddr, skb->csum); | |
192 | ||
193 | skb->ip_summed = CHECKSUM_NONE; | |
194 | ||
195 | return 1; | |
196 | } | |
197 | ||
d14a489a | 198 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, |
eb4d4065 GB |
199 | unsigned int ihl, unsigned int ipl) |
200 | { | |
201 | struct tcphdr *tcph; | |
d14a489a | 202 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
203 | |
204 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); | |
205 | if (tcph == NULL) | |
206 | return 0; | |
207 | ||
d14a489a | 208 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
209 | tcph->check = 0; |
210 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
211 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
212 | ipl - ihl, IPPROTO_TCP, | |
213 | skb->csum); | |
214 | ||
215 | skb->ip_summed = CHECKSUM_NONE; | |
216 | ||
217 | return 1; | |
218 | } | |
219 | ||
d14a489a | 220 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, |
eb4d4065 GB |
221 | unsigned int ihl, unsigned int ipl, int udplite) |
222 | { | |
223 | struct udphdr *udph; | |
d14a489a | 224 | const struct iphdr *iph; |
eb4d4065 GB |
225 | u16 ul; |
226 | ||
0eec32ff CG |
227 | /* |
228 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
229 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
230 | * UDPLITE uses udph->len for another thing, |
231 | * Use iph->tot_len, or just ipl. | |
232 | */ | |
233 | ||
234 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
235 | if (udph == NULL) | |
236 | return 0; | |
237 | ||
d14a489a | 238 | iph = ip_hdr(skb); |
eb4d4065 GB |
239 | ul = ntohs(udph->len); |
240 | ||
241 | if (udplite || udph->check) { | |
242 | ||
243 | udph->check = 0; | |
244 | ||
245 | if (udplite) { | |
246 | if (ul == 0) | |
247 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
248 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
249 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
250 | else |
251 | goto ignore_obscure_skb; | |
252 | } else { | |
253 | if (ul != ipl - ihl) | |
254 | goto ignore_obscure_skb; | |
255 | ||
256 | skb->csum = csum_partial(udph, ul, 0); | |
257 | } | |
258 | ||
259 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
260 | ul, iph->protocol, | |
261 | skb->csum); | |
262 | ||
263 | if (!udph->check) | |
264 | udph->check = CSUM_MANGLED_0; | |
265 | } | |
266 | ||
267 | skb->ip_summed = CHECKSUM_NONE; | |
268 | ||
269 | ignore_obscure_skb: | |
270 | return 1; | |
271 | } | |
272 | ||
d14a489a | 273 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, |
eb4d4065 GB |
274 | unsigned int ihl, unsigned int ipl, int udplite) |
275 | { | |
276 | struct udphdr *udph; | |
d14a489a | 277 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
278 | u16 ul; |
279 | ||
0eec32ff CG |
280 | /* |
281 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
282 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
283 | * UDPLITE uses udph->len for another thing, |
284 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
285 | */ | |
286 | ||
287 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
288 | if (udph == NULL) | |
289 | return 0; | |
290 | ||
d14a489a | 291 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
292 | ul = ntohs(udph->len); |
293 | ||
294 | udph->check = 0; | |
295 | ||
296 | if (udplite) { | |
297 | if (ul == 0) | |
298 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
299 | ||
300 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
301 | skb->csum = csum_partial(udph, ul, 0); | |
302 | ||
303 | else | |
304 | goto ignore_obscure_skb; | |
305 | } else { | |
306 | if (ul != ipl - ihl) | |
307 | goto ignore_obscure_skb; | |
308 | ||
309 | skb->csum = csum_partial(udph, ul, 0); | |
310 | } | |
311 | ||
312 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
313 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
314 | skb->csum); | |
315 | ||
316 | if (!udph->check) | |
317 | udph->check = CSUM_MANGLED_0; | |
318 | ||
319 | skb->ip_summed = CHECKSUM_NONE; | |
320 | ||
321 | ignore_obscure_skb: | |
322 | return 1; | |
323 | } | |
324 | ||
325 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) | |
326 | { | |
d14a489a | 327 | const struct iphdr *iph; |
eb4d4065 GB |
328 | int ntkoff; |
329 | ||
330 | ntkoff = skb_network_offset(skb); | |
331 | ||
332 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
333 | goto fail; | |
334 | ||
335 | iph = ip_hdr(skb); | |
336 | ||
337 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
338 | case IPPROTO_ICMP: | |
339 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
340 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
341 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
342 | goto fail; |
343 | break; | |
344 | case IPPROTO_IGMP: | |
345 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
346 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
347 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
348 | goto fail; |
349 | break; | |
350 | case IPPROTO_TCP: | |
351 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 352 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 353 | ntohs(iph->tot_len))) |
eb4d4065 GB |
354 | goto fail; |
355 | break; | |
356 | case IPPROTO_UDP: | |
357 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 358 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 359 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
360 | goto fail; |
361 | break; | |
362 | case IPPROTO_UDPLITE: | |
363 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 364 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 365 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
366 | goto fail; |
367 | break; | |
368 | } | |
369 | ||
370 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 371 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
372 | goto fail; |
373 | ||
d14a489a | 374 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
375 | } |
376 | ||
377 | return 1; | |
378 | ||
379 | fail: | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, | |
0eec32ff | 384 | unsigned int ixhl, unsigned int *pl) |
eb4d4065 GB |
385 | { |
386 | int off, len, optlen; | |
387 | unsigned char *xh = (void *)ip6xh; | |
388 | ||
389 | off = sizeof(*ip6xh); | |
390 | len = ixhl - off; | |
391 | ||
392 | while (len > 1) { | |
0eec32ff | 393 | switch (xh[off]) { |
1de5a71c | 394 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
395 | optlen = 1; |
396 | break; | |
397 | case IPV6_TLV_JUMBO: | |
398 | optlen = xh[off + 1] + 2; | |
399 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
400 | /* wrong jumbo option length/alignment */ | |
401 | return 0; | |
402 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
403 | goto done; | |
404 | default: | |
405 | optlen = xh[off + 1] + 2; | |
406 | if (optlen > len) | |
407 | /* ignore obscure options */ | |
408 | goto done; | |
409 | break; | |
410 | } | |
411 | off += optlen; | |
412 | len -= optlen; | |
413 | } | |
414 | ||
415 | done: | |
416 | return 1; | |
417 | } | |
418 | ||
419 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
420 | { | |
421 | struct ipv6hdr *ip6h; | |
422 | struct ipv6_opt_hdr *ip6xh; | |
423 | unsigned int hl, ixhl; | |
424 | unsigned int pl; | |
425 | int ntkoff; | |
426 | u8 nexthdr; | |
427 | ||
428 | ntkoff = skb_network_offset(skb); | |
429 | ||
430 | hl = sizeof(*ip6h); | |
431 | ||
432 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
433 | goto fail; | |
434 | ||
435 | ip6h = ipv6_hdr(skb); | |
436 | ||
437 | pl = ntohs(ip6h->payload_len); | |
438 | nexthdr = ip6h->nexthdr; | |
439 | ||
440 | do { | |
441 | switch (nexthdr) { | |
442 | case NEXTHDR_FRAGMENT: | |
443 | goto ignore_skb; | |
444 | case NEXTHDR_ROUTING: | |
445 | case NEXTHDR_HOP: | |
446 | case NEXTHDR_DEST: | |
447 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
448 | goto fail; | |
449 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
450 | ixhl = ipv6_optlen(ip6xh); | |
451 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
452 | goto fail; | |
d14a489a | 453 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
454 | if ((nexthdr == NEXTHDR_HOP) && |
455 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
456 | goto fail; | |
457 | nexthdr = ip6xh->nexthdr; | |
458 | hl += ixhl; | |
459 | break; | |
460 | case IPPROTO_ICMPV6: | |
461 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 462 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
463 | hl, pl + sizeof(*ip6h))) |
464 | goto fail; | |
465 | goto done; | |
466 | case IPPROTO_TCP: | |
467 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 468 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
469 | hl, pl + sizeof(*ip6h))) |
470 | goto fail; | |
471 | goto done; | |
472 | case IPPROTO_UDP: | |
473 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 474 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 475 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
476 | goto fail; |
477 | goto done; | |
478 | case IPPROTO_UDPLITE: | |
479 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 480 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 481 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
482 | goto fail; |
483 | goto done; | |
484 | default: | |
485 | goto ignore_skb; | |
486 | } | |
487 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
488 | ||
489 | done: | |
490 | ignore_skb: | |
491 | return 1; | |
492 | ||
493 | fail: | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int tcf_csum(struct sk_buff *skb, | |
dc7f9f6e | 498 | const struct tc_action *a, struct tcf_result *res) |
eb4d4065 | 499 | { |
a85a970a | 500 | struct tcf_csum *p = to_tcf_csum(a); |
eb4d4065 GB |
501 | int action; |
502 | u32 update_flags; | |
503 | ||
504 | spin_lock(&p->tcf_lock); | |
9c4a4e48 | 505 | tcf_lastuse_update(&p->tcf_tm); |
bfe0d029 | 506 | bstats_update(&p->tcf_bstats, skb); |
eb4d4065 GB |
507 | action = p->tcf_action; |
508 | update_flags = p->update_flags; | |
509 | spin_unlock(&p->tcf_lock); | |
510 | ||
511 | if (unlikely(action == TC_ACT_SHOT)) | |
512 | goto drop; | |
513 | ||
d8b9605d | 514 | switch (tc_skb_protocol(skb)) { |
eb4d4065 GB |
515 | case cpu_to_be16(ETH_P_IP): |
516 | if (!tcf_csum_ipv4(skb, update_flags)) | |
517 | goto drop; | |
518 | break; | |
519 | case cpu_to_be16(ETH_P_IPV6): | |
520 | if (!tcf_csum_ipv6(skb, update_flags)) | |
521 | goto drop; | |
522 | break; | |
523 | } | |
524 | ||
525 | return action; | |
526 | ||
527 | drop: | |
528 | spin_lock(&p->tcf_lock); | |
529 | p->tcf_qstats.drops++; | |
530 | spin_unlock(&p->tcf_lock); | |
531 | return TC_ACT_SHOT; | |
532 | } | |
533 | ||
534 | static int tcf_csum_dump(struct sk_buff *skb, | |
535 | struct tc_action *a, int bind, int ref) | |
536 | { | |
537 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 538 | struct tcf_csum *p = to_tcf_csum(a); |
eb4d4065 GB |
539 | struct tc_csum opt = { |
540 | .update_flags = p->update_flags, | |
eb4d4065 GB |
541 | .index = p->tcf_index, |
542 | .action = p->tcf_action, | |
543 | .refcnt = p->tcf_refcnt - ref, | |
544 | .bindcnt = p->tcf_bindcnt - bind, | |
545 | }; | |
546 | struct tcf_t t; | |
547 | ||
1b34ec43 DM |
548 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
549 | goto nla_put_failure; | |
48d8ee16 JHS |
550 | |
551 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 552 | if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) |
1b34ec43 | 553 | goto nla_put_failure; |
eb4d4065 GB |
554 | |
555 | return skb->len; | |
556 | ||
557 | nla_put_failure: | |
558 | nlmsg_trim(skb, b); | |
559 | return -1; | |
560 | } | |
561 | ||
ddf97ccd WC |
562 | static int tcf_csum_walker(struct net *net, struct sk_buff *skb, |
563 | struct netlink_callback *cb, int type, | |
a85a970a | 564 | const struct tc_action_ops *ops) |
ddf97ccd WC |
565 | { |
566 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
567 | ||
a85a970a | 568 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
569 | } |
570 | ||
a85a970a | 571 | static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
572 | { |
573 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
574 | ||
575 | return tcf_hash_search(tn, a, index); | |
576 | } | |
577 | ||
eb4d4065 | 578 | static struct tc_action_ops act_csum_ops = { |
0eec32ff | 579 | .kind = "csum", |
0eec32ff | 580 | .type = TCA_ACT_CSUM, |
0eec32ff CG |
581 | .owner = THIS_MODULE, |
582 | .act = tcf_csum, | |
583 | .dump = tcf_csum_dump, | |
0eec32ff | 584 | .init = tcf_csum_init, |
ddf97ccd WC |
585 | .walk = tcf_csum_walker, |
586 | .lookup = tcf_csum_search, | |
a85a970a | 587 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
588 | }; |
589 | ||
590 | static __net_init int csum_init_net(struct net *net) | |
591 | { | |
592 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
593 | ||
594 | return tc_action_net_init(tn, &act_csum_ops, CSUM_TAB_MASK); | |
595 | } | |
596 | ||
597 | static void __net_exit csum_exit_net(struct net *net) | |
598 | { | |
599 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
600 | ||
601 | tc_action_net_exit(tn); | |
602 | } | |
603 | ||
604 | static struct pernet_operations csum_net_ops = { | |
605 | .init = csum_init_net, | |
606 | .exit = csum_exit_net, | |
607 | .id = &csum_net_id, | |
608 | .size = sizeof(struct tc_action_net), | |
eb4d4065 GB |
609 | }; |
610 | ||
611 | MODULE_DESCRIPTION("Checksum updating actions"); | |
612 | MODULE_LICENSE("GPL"); | |
613 | ||
614 | static int __init csum_init_module(void) | |
615 | { | |
ddf97ccd | 616 | return tcf_register_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
617 | } |
618 | ||
619 | static void __exit csum_cleanup_module(void) | |
620 | { | |
ddf97ccd | 621 | tcf_unregister_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
622 | } |
623 | ||
624 | module_init(csum_init_module); | |
625 | module_exit(csum_cleanup_module); |