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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> |
c008b33f | 33 | #include <net/sctp/checksum.h> |
eb4d4065 GB |
34 | |
35 | #include <net/act_api.h> | |
36 | ||
37 | #include <linux/tc_act/tc_csum.h> | |
38 | #include <net/tc_act/tc_csum.h> | |
39 | ||
eb4d4065 GB |
40 | static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { |
41 | [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, | |
42 | }; | |
43 | ||
c7d03a00 | 44 | static unsigned int csum_net_id; |
a85a970a | 45 | static struct tc_action_ops act_csum_ops; |
ddf97ccd WC |
46 | |
47 | static int tcf_csum_init(struct net *net, struct nlattr *nla, | |
a85a970a | 48 | struct nlattr *est, struct tc_action **a, int ovr, |
789871bb VB |
49 | int bind, bool rtnl_held, |
50 | struct netlink_ext_ack *extack) | |
eb4d4065 | 51 | { |
ddf97ccd | 52 | struct tc_action_net *tn = net_generic(net, csum_net_id); |
b6a2b971 | 53 | struct tcf_csum_params *params_new; |
eb4d4065 GB |
54 | struct nlattr *tb[TCA_CSUM_MAX + 1]; |
55 | struct tc_csum *parm; | |
eb4d4065 GB |
56 | struct tcf_csum *p; |
57 | int ret = 0, err; | |
58 | ||
59 | if (nla == NULL) | |
60 | return -EINVAL; | |
61 | ||
fceb6435 | 62 | err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL); |
eb4d4065 GB |
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 | ||
0190c1d4 VB |
70 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
71 | if (!err) { | |
65a206c0 | 72 | ret = tcf_idr_create(tn, parm->index, est, a, |
f6052cf2 | 73 | &act_csum_ops, bind, true); |
0190c1d4 VB |
74 | if (ret) { |
75 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 76 | return ret; |
0190c1d4 | 77 | } |
eb4d4065 | 78 | ret = ACT_P_CREATED; |
0190c1d4 | 79 | } else if (err > 0) { |
1a29321e JHS |
80 | if (bind)/* dont override defaults */ |
81 | return 0; | |
4e8ddd7f VB |
82 | if (!ovr) { |
83 | tcf_idr_release(*a, bind); | |
eb4d4065 | 84 | return -EEXIST; |
4e8ddd7f | 85 | } |
0190c1d4 VB |
86 | } else { |
87 | return err; | |
eb4d4065 GB |
88 | } |
89 | ||
a85a970a | 90 | p = to_tcf_csum(*a); |
9c5f69bb DC |
91 | |
92 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); | |
93 | if (unlikely(!params_new)) { | |
4e8ddd7f | 94 | tcf_idr_release(*a, bind); |
9c5f69bb DC |
95 | return -ENOMEM; |
96 | } | |
b6a2b971 | 97 | params_new->update_flags = parm->update_flags; |
9c5f69bb | 98 | |
b6a2b971 | 99 | spin_lock(&p->tcf_lock); |
11a245e2 | 100 | p->tcf_action = parm->action; |
b6a2b971 VB |
101 | rcu_swap_protected(p->params, params_new, |
102 | lockdep_is_held(&p->tcf_lock)); | |
103 | spin_unlock(&p->tcf_lock); | |
104 | ||
105 | if (params_new) | |
106 | kfree_rcu(params_new, rcu); | |
eb4d4065 GB |
107 | |
108 | if (ret == ACT_P_CREATED) | |
65a206c0 | 109 | tcf_idr_insert(tn, *a); |
eb4d4065 GB |
110 | |
111 | return ret; | |
112 | } | |
113 | ||
eb4d4065 GB |
114 | /** |
115 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
116 | * @skb: sk_buff to use | |
117 | * @ihl: previous summed headers length | |
118 | * @ipl: complete packet length | |
119 | * @jhl: next header length | |
120 | * | |
121 | * Check the expected next layer availability in the specified sk_buff. | |
122 | * Return the next layer pointer if pass, NULL otherwise. | |
123 | */ | |
124 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
125 | unsigned int ihl, unsigned int ipl, | |
126 | unsigned int jhl) | |
127 | { | |
128 | int ntkoff = skb_network_offset(skb); | |
129 | int hl = ihl + jhl; | |
130 | ||
131 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 132 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
133 | return NULL; |
134 | else | |
135 | return (void *)(skb_network_header(skb) + ihl); | |
136 | } | |
137 | ||
5a7a5555 JHS |
138 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, |
139 | unsigned int ipl) | |
eb4d4065 GB |
140 | { |
141 | struct icmphdr *icmph; | |
142 | ||
143 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
144 | if (icmph == NULL) | |
145 | return 0; | |
146 | ||
147 | icmph->checksum = 0; | |
148 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
149 | icmph->checksum = csum_fold(skb->csum); | |
150 | ||
151 | skb->ip_summed = CHECKSUM_NONE; | |
152 | ||
153 | return 1; | |
154 | } | |
155 | ||
156 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
157 | unsigned int ihl, unsigned int ipl) | |
158 | { | |
159 | struct igmphdr *igmph; | |
160 | ||
161 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
162 | if (igmph == NULL) | |
163 | return 0; | |
164 | ||
165 | igmph->csum = 0; | |
166 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
167 | igmph->csum = csum_fold(skb->csum); | |
168 | ||
169 | skb->ip_summed = CHECKSUM_NONE; | |
170 | ||
171 | return 1; | |
172 | } | |
173 | ||
5a7a5555 JHS |
174 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, |
175 | unsigned int ipl) | |
eb4d4065 GB |
176 | { |
177 | struct icmp6hdr *icmp6h; | |
d14a489a | 178 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
179 | |
180 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
181 | if (icmp6h == NULL) | |
182 | return 0; | |
183 | ||
d14a489a | 184 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
185 | icmp6h->icmp6_cksum = 0; |
186 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
187 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
188 | ipl - ihl, IPPROTO_ICMPV6, | |
189 | skb->csum); | |
190 | ||
191 | skb->ip_summed = CHECKSUM_NONE; | |
192 | ||
193 | return 1; | |
194 | } | |
195 | ||
5a7a5555 JHS |
196 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, |
197 | unsigned int ipl) | |
eb4d4065 GB |
198 | { |
199 | struct tcphdr *tcph; | |
d14a489a | 200 | const struct iphdr *iph; |
eb4d4065 | 201 | |
add641e7 DC |
202 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
203 | return 1; | |
204 | ||
eb4d4065 GB |
205 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
206 | if (tcph == NULL) | |
207 | return 0; | |
208 | ||
d14a489a | 209 | iph = ip_hdr(skb); |
eb4d4065 GB |
210 | tcph->check = 0; |
211 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
212 | tcph->check = tcp_v4_check(ipl - ihl, | |
213 | iph->saddr, iph->daddr, skb->csum); | |
214 | ||
215 | skb->ip_summed = CHECKSUM_NONE; | |
216 | ||
217 | return 1; | |
218 | } | |
219 | ||
5a7a5555 JHS |
220 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, |
221 | unsigned int ipl) | |
eb4d4065 GB |
222 | { |
223 | struct tcphdr *tcph; | |
d14a489a | 224 | const struct ipv6hdr *ip6h; |
eb4d4065 | 225 | |
add641e7 DC |
226 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
227 | return 1; | |
228 | ||
eb4d4065 GB |
229 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
230 | if (tcph == NULL) | |
231 | return 0; | |
232 | ||
d14a489a | 233 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
234 | tcph->check = 0; |
235 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
236 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
237 | ipl - ihl, IPPROTO_TCP, | |
238 | skb->csum); | |
239 | ||
240 | skb->ip_summed = CHECKSUM_NONE; | |
241 | ||
242 | return 1; | |
243 | } | |
244 | ||
5a7a5555 JHS |
245 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, |
246 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
247 | { |
248 | struct udphdr *udph; | |
d14a489a | 249 | const struct iphdr *iph; |
eb4d4065 GB |
250 | u16 ul; |
251 | ||
0c19f846 WB |
252 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
253 | return 1; | |
254 | ||
0eec32ff CG |
255 | /* |
256 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
257 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
258 | * UDPLITE uses udph->len for another thing, |
259 | * Use iph->tot_len, or just ipl. | |
260 | */ | |
261 | ||
262 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
263 | if (udph == NULL) | |
264 | return 0; | |
265 | ||
d14a489a | 266 | iph = ip_hdr(skb); |
eb4d4065 GB |
267 | ul = ntohs(udph->len); |
268 | ||
269 | if (udplite || udph->check) { | |
270 | ||
271 | udph->check = 0; | |
272 | ||
273 | if (udplite) { | |
274 | if (ul == 0) | |
275 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
276 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
277 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
278 | else |
279 | goto ignore_obscure_skb; | |
280 | } else { | |
281 | if (ul != ipl - ihl) | |
282 | goto ignore_obscure_skb; | |
283 | ||
284 | skb->csum = csum_partial(udph, ul, 0); | |
285 | } | |
286 | ||
287 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
288 | ul, iph->protocol, | |
289 | skb->csum); | |
290 | ||
291 | if (!udph->check) | |
292 | udph->check = CSUM_MANGLED_0; | |
293 | } | |
294 | ||
295 | skb->ip_summed = CHECKSUM_NONE; | |
296 | ||
297 | ignore_obscure_skb: | |
298 | return 1; | |
299 | } | |
300 | ||
5a7a5555 JHS |
301 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, |
302 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
303 | { |
304 | struct udphdr *udph; | |
d14a489a | 305 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
306 | u16 ul; |
307 | ||
0c19f846 WB |
308 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
309 | return 1; | |
310 | ||
0eec32ff CG |
311 | /* |
312 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
313 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
314 | * UDPLITE uses udph->len for another thing, |
315 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
316 | */ | |
317 | ||
318 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
319 | if (udph == NULL) | |
320 | return 0; | |
321 | ||
d14a489a | 322 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
323 | ul = ntohs(udph->len); |
324 | ||
325 | udph->check = 0; | |
326 | ||
327 | if (udplite) { | |
328 | if (ul == 0) | |
329 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
330 | ||
331 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
332 | skb->csum = csum_partial(udph, ul, 0); | |
333 | ||
334 | else | |
335 | goto ignore_obscure_skb; | |
336 | } else { | |
337 | if (ul != ipl - ihl) | |
338 | goto ignore_obscure_skb; | |
339 | ||
340 | skb->csum = csum_partial(udph, ul, 0); | |
341 | } | |
342 | ||
343 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
344 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
345 | skb->csum); | |
346 | ||
347 | if (!udph->check) | |
348 | udph->check = CSUM_MANGLED_0; | |
349 | ||
350 | skb->ip_summed = CHECKSUM_NONE; | |
351 | ||
352 | ignore_obscure_skb: | |
353 | return 1; | |
354 | } | |
355 | ||
c008b33f DC |
356 | static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, |
357 | unsigned int ipl) | |
358 | { | |
359 | struct sctphdr *sctph; | |
360 | ||
1dd27cde | 361 | if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) |
c008b33f DC |
362 | return 1; |
363 | ||
364 | sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); | |
365 | if (!sctph) | |
366 | return 0; | |
367 | ||
368 | sctph->checksum = sctp_compute_cksum(skb, | |
369 | skb_network_offset(skb) + ihl); | |
370 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 371 | skb->csum_not_inet = 0; |
c008b33f DC |
372 | |
373 | return 1; | |
374 | } | |
375 | ||
eb4d4065 GB |
376 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) |
377 | { | |
d14a489a | 378 | const struct iphdr *iph; |
eb4d4065 GB |
379 | int ntkoff; |
380 | ||
381 | ntkoff = skb_network_offset(skb); | |
382 | ||
383 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
384 | goto fail; | |
385 | ||
386 | iph = ip_hdr(skb); | |
387 | ||
388 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
389 | case IPPROTO_ICMP: | |
390 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
391 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
392 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
393 | goto fail; |
394 | break; | |
395 | case IPPROTO_IGMP: | |
396 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
397 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
398 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
399 | goto fail; |
400 | break; | |
401 | case IPPROTO_TCP: | |
402 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 403 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 404 | ntohs(iph->tot_len))) |
eb4d4065 GB |
405 | goto fail; |
406 | break; | |
407 | case IPPROTO_UDP: | |
408 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 409 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 410 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
411 | goto fail; |
412 | break; | |
413 | case IPPROTO_UDPLITE: | |
414 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 415 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 416 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
417 | goto fail; |
418 | break; | |
c008b33f DC |
419 | case IPPROTO_SCTP: |
420 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
421 | !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) | |
422 | goto fail; | |
423 | break; | |
eb4d4065 GB |
424 | } |
425 | ||
426 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 427 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
428 | goto fail; |
429 | ||
d14a489a | 430 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
431 | } |
432 | ||
433 | return 1; | |
434 | ||
435 | fail: | |
436 | return 0; | |
437 | } | |
438 | ||
5a7a5555 JHS |
439 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, |
440 | unsigned int *pl) | |
eb4d4065 GB |
441 | { |
442 | int off, len, optlen; | |
443 | unsigned char *xh = (void *)ip6xh; | |
444 | ||
445 | off = sizeof(*ip6xh); | |
446 | len = ixhl - off; | |
447 | ||
448 | while (len > 1) { | |
0eec32ff | 449 | switch (xh[off]) { |
1de5a71c | 450 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
451 | optlen = 1; |
452 | break; | |
453 | case IPV6_TLV_JUMBO: | |
454 | optlen = xh[off + 1] + 2; | |
455 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
456 | /* wrong jumbo option length/alignment */ | |
457 | return 0; | |
458 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
459 | goto done; | |
460 | default: | |
461 | optlen = xh[off + 1] + 2; | |
462 | if (optlen > len) | |
463 | /* ignore obscure options */ | |
464 | goto done; | |
465 | break; | |
466 | } | |
467 | off += optlen; | |
468 | len -= optlen; | |
469 | } | |
470 | ||
471 | done: | |
472 | return 1; | |
473 | } | |
474 | ||
475 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
476 | { | |
477 | struct ipv6hdr *ip6h; | |
478 | struct ipv6_opt_hdr *ip6xh; | |
479 | unsigned int hl, ixhl; | |
480 | unsigned int pl; | |
481 | int ntkoff; | |
482 | u8 nexthdr; | |
483 | ||
484 | ntkoff = skb_network_offset(skb); | |
485 | ||
486 | hl = sizeof(*ip6h); | |
487 | ||
488 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
489 | goto fail; | |
490 | ||
491 | ip6h = ipv6_hdr(skb); | |
492 | ||
493 | pl = ntohs(ip6h->payload_len); | |
494 | nexthdr = ip6h->nexthdr; | |
495 | ||
496 | do { | |
497 | switch (nexthdr) { | |
498 | case NEXTHDR_FRAGMENT: | |
499 | goto ignore_skb; | |
500 | case NEXTHDR_ROUTING: | |
501 | case NEXTHDR_HOP: | |
502 | case NEXTHDR_DEST: | |
503 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
504 | goto fail; | |
505 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
506 | ixhl = ipv6_optlen(ip6xh); | |
507 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
508 | goto fail; | |
d14a489a | 509 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
510 | if ((nexthdr == NEXTHDR_HOP) && |
511 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
512 | goto fail; | |
513 | nexthdr = ip6xh->nexthdr; | |
514 | hl += ixhl; | |
515 | break; | |
516 | case IPPROTO_ICMPV6: | |
517 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 518 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
519 | hl, pl + sizeof(*ip6h))) |
520 | goto fail; | |
521 | goto done; | |
522 | case IPPROTO_TCP: | |
523 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 524 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
525 | hl, pl + sizeof(*ip6h))) |
526 | goto fail; | |
527 | goto done; | |
528 | case IPPROTO_UDP: | |
529 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 530 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 531 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
532 | goto fail; |
533 | goto done; | |
534 | case IPPROTO_UDPLITE: | |
535 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 536 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 537 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
538 | goto fail; |
539 | goto done; | |
c008b33f DC |
540 | case IPPROTO_SCTP: |
541 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
542 | !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) | |
543 | goto fail; | |
544 | goto done; | |
eb4d4065 GB |
545 | default: |
546 | goto ignore_skb; | |
547 | } | |
548 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
549 | ||
550 | done: | |
551 | ignore_skb: | |
552 | return 1; | |
553 | ||
554 | fail: | |
555 | return 0; | |
556 | } | |
557 | ||
5a7a5555 JHS |
558 | static int tcf_csum(struct sk_buff *skb, const struct tc_action *a, |
559 | struct tcf_result *res) | |
eb4d4065 | 560 | { |
a85a970a | 561 | struct tcf_csum *p = to_tcf_csum(a); |
9c5f69bb | 562 | struct tcf_csum_params *params; |
eb4d4065 | 563 | u32 update_flags; |
9c5f69bb DC |
564 | int action; |
565 | ||
7fd4b288 | 566 | params = rcu_dereference_bh(p->params); |
eb4d4065 | 567 | |
9c4a4e48 | 568 | tcf_lastuse_update(&p->tcf_tm); |
f6052cf2 | 569 | bstats_cpu_update(this_cpu_ptr(p->common.cpu_bstats), skb); |
eb4d4065 | 570 | |
11a245e2 | 571 | action = READ_ONCE(p->tcf_action); |
eb4d4065 | 572 | if (unlikely(action == TC_ACT_SHOT)) |
7fd4b288 | 573 | goto drop; |
eb4d4065 | 574 | |
9c5f69bb | 575 | update_flags = params->update_flags; |
d8b9605d | 576 | switch (tc_skb_protocol(skb)) { |
eb4d4065 GB |
577 | case cpu_to_be16(ETH_P_IP): |
578 | if (!tcf_csum_ipv4(skb, update_flags)) | |
579 | goto drop; | |
580 | break; | |
581 | case cpu_to_be16(ETH_P_IPV6): | |
582 | if (!tcf_csum_ipv6(skb, update_flags)) | |
583 | goto drop; | |
584 | break; | |
585 | } | |
586 | ||
587 | return action; | |
588 | ||
589 | drop: | |
f6052cf2 | 590 | qstats_drop_inc(this_cpu_ptr(p->common.cpu_qstats)); |
7fd4b288 | 591 | return TC_ACT_SHOT; |
eb4d4065 GB |
592 | } |
593 | ||
5a7a5555 JHS |
594 | static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
595 | int ref) | |
eb4d4065 GB |
596 | { |
597 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 598 | struct tcf_csum *p = to_tcf_csum(a); |
9c5f69bb | 599 | struct tcf_csum_params *params; |
eb4d4065 | 600 | struct tc_csum opt = { |
eb4d4065 | 601 | .index = p->tcf_index, |
036bb443 VB |
602 | .refcnt = refcount_read(&p->tcf_refcnt) - ref, |
603 | .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, | |
eb4d4065 GB |
604 | }; |
605 | struct tcf_t t; | |
606 | ||
b6a2b971 VB |
607 | spin_lock(&p->tcf_lock); |
608 | params = rcu_dereference_protected(p->params, | |
609 | lockdep_is_held(&p->tcf_lock)); | |
610 | opt.action = p->tcf_action; | |
9c5f69bb DC |
611 | opt.update_flags = params->update_flags; |
612 | ||
1b34ec43 DM |
613 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
614 | goto nla_put_failure; | |
48d8ee16 JHS |
615 | |
616 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 617 | if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) |
1b34ec43 | 618 | goto nla_put_failure; |
b6a2b971 | 619 | spin_unlock(&p->tcf_lock); |
eb4d4065 GB |
620 | |
621 | return skb->len; | |
622 | ||
623 | nla_put_failure: | |
b6a2b971 | 624 | spin_unlock(&p->tcf_lock); |
eb4d4065 GB |
625 | nlmsg_trim(skb, b); |
626 | return -1; | |
627 | } | |
628 | ||
9c5f69bb DC |
629 | static void tcf_csum_cleanup(struct tc_action *a) |
630 | { | |
631 | struct tcf_csum *p = to_tcf_csum(a); | |
632 | struct tcf_csum_params *params; | |
633 | ||
634 | params = rcu_dereference_protected(p->params, 1); | |
aab378a7 DC |
635 | if (params) |
636 | kfree_rcu(params, rcu); | |
9c5f69bb DC |
637 | } |
638 | ||
ddf97ccd WC |
639 | static int tcf_csum_walker(struct net *net, struct sk_buff *skb, |
640 | struct netlink_callback *cb, int type, | |
41780105 AA |
641 | const struct tc_action_ops *ops, |
642 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
643 | { |
644 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
645 | ||
b3620145 | 646 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
647 | } |
648 | ||
331a9295 AA |
649 | static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index, |
650 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
651 | { |
652 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
653 | ||
65a206c0 | 654 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
655 | } |
656 | ||
29e6eee1 CD |
657 | static size_t tcf_csum_get_fill_size(const struct tc_action *act) |
658 | { | |
659 | return nla_total_size(sizeof(struct tc_csum)); | |
660 | } | |
661 | ||
b409074e VB |
662 | static int tcf_csum_delete(struct net *net, u32 index) |
663 | { | |
664 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
665 | ||
666 | return tcf_idr_delete_index(tn, index); | |
667 | } | |
668 | ||
eb4d4065 | 669 | static struct tc_action_ops act_csum_ops = { |
0eec32ff | 670 | .kind = "csum", |
0eec32ff | 671 | .type = TCA_ACT_CSUM, |
0eec32ff CG |
672 | .owner = THIS_MODULE, |
673 | .act = tcf_csum, | |
674 | .dump = tcf_csum_dump, | |
0eec32ff | 675 | .init = tcf_csum_init, |
9c5f69bb | 676 | .cleanup = tcf_csum_cleanup, |
ddf97ccd WC |
677 | .walk = tcf_csum_walker, |
678 | .lookup = tcf_csum_search, | |
29e6eee1 | 679 | .get_fill_size = tcf_csum_get_fill_size, |
b409074e | 680 | .delete = tcf_csum_delete, |
a85a970a | 681 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
682 | }; |
683 | ||
684 | static __net_init int csum_init_net(struct net *net) | |
685 | { | |
686 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
687 | ||
c7e460ce | 688 | return tc_action_net_init(tn, &act_csum_ops); |
ddf97ccd WC |
689 | } |
690 | ||
039af9c6 | 691 | static void __net_exit csum_exit_net(struct list_head *net_list) |
ddf97ccd | 692 | { |
039af9c6 | 693 | tc_action_net_exit(net_list, csum_net_id); |
ddf97ccd WC |
694 | } |
695 | ||
696 | static struct pernet_operations csum_net_ops = { | |
697 | .init = csum_init_net, | |
039af9c6 | 698 | .exit_batch = csum_exit_net, |
ddf97ccd WC |
699 | .id = &csum_net_id, |
700 | .size = sizeof(struct tc_action_net), | |
eb4d4065 GB |
701 | }; |
702 | ||
703 | MODULE_DESCRIPTION("Checksum updating actions"); | |
704 | MODULE_LICENSE("GPL"); | |
705 | ||
706 | static int __init csum_init_module(void) | |
707 | { | |
ddf97ccd | 708 | return tcf_register_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
709 | } |
710 | ||
711 | static void __exit csum_cleanup_module(void) | |
712 | { | |
ddf97ccd | 713 | tcf_unregister_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
714 | } |
715 | ||
716 | module_init(csum_init_module); | |
717 | module_exit(csum_cleanup_module); |