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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
eb4d4065 GB |
2 | /* |
3 | * Checksum updating actions | |
4 | * | |
5 | * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org> | |
eb4d4065 GB |
6 | */ |
7 | ||
8 | #include <linux/types.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/spinlock.h> | |
13 | ||
14 | #include <linux/netlink.h> | |
15 | #include <net/netlink.h> | |
16 | #include <linux/rtnetlink.h> | |
17 | ||
18 | #include <linux/skbuff.h> | |
19 | ||
20 | #include <net/ip.h> | |
21 | #include <net/ipv6.h> | |
22 | #include <net/icmp.h> | |
23 | #include <linux/icmpv6.h> | |
24 | #include <linux/igmp.h> | |
25 | #include <net/tcp.h> | |
26 | #include <net/udp.h> | |
2436243a | 27 | #include <net/ip6_checksum.h> |
c008b33f | 28 | #include <net/sctp/checksum.h> |
eb4d4065 GB |
29 | |
30 | #include <net/act_api.h> | |
f5c29d83 | 31 | #include <net/pkt_cls.h> |
eb4d4065 GB |
32 | |
33 | #include <linux/tc_act/tc_csum.h> | |
34 | #include <net/tc_act/tc_csum.h> | |
35 | ||
eb4d4065 GB |
36 | static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = { |
37 | [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), }, | |
38 | }; | |
39 | ||
c7d03a00 | 40 | static unsigned int csum_net_id; |
a85a970a | 41 | static struct tc_action_ops act_csum_ops; |
ddf97ccd WC |
42 | |
43 | static int tcf_csum_init(struct net *net, struct nlattr *nla, | |
a85a970a | 44 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 45 | int bind, bool rtnl_held, struct tcf_proto *tp, |
789871bb | 46 | struct netlink_ext_ack *extack) |
eb4d4065 | 47 | { |
ddf97ccd | 48 | struct tc_action_net *tn = net_generic(net, csum_net_id); |
b6a2b971 | 49 | struct tcf_csum_params *params_new; |
eb4d4065 | 50 | struct nlattr *tb[TCA_CSUM_MAX + 1]; |
f5c29d83 | 51 | struct tcf_chain *goto_ch = NULL; |
eb4d4065 | 52 | struct tc_csum *parm; |
eb4d4065 GB |
53 | struct tcf_csum *p; |
54 | int ret = 0, err; | |
55 | ||
56 | if (nla == NULL) | |
57 | return -EINVAL; | |
58 | ||
8cb08174 JB |
59 | err = nla_parse_nested_deprecated(tb, TCA_CSUM_MAX, nla, csum_policy, |
60 | NULL); | |
eb4d4065 GB |
61 | if (err < 0) |
62 | return err; | |
63 | ||
64 | if (tb[TCA_CSUM_PARMS] == NULL) | |
65 | return -EINVAL; | |
66 | parm = nla_data(tb[TCA_CSUM_PARMS]); | |
67 | ||
0190c1d4 VB |
68 | err = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
69 | if (!err) { | |
65a206c0 | 70 | ret = tcf_idr_create(tn, parm->index, est, a, |
f6052cf2 | 71 | &act_csum_ops, bind, true); |
0190c1d4 VB |
72 | if (ret) { |
73 | tcf_idr_cleanup(tn, parm->index); | |
86062033 | 74 | return ret; |
0190c1d4 | 75 | } |
eb4d4065 | 76 | ret = ACT_P_CREATED; |
0190c1d4 | 77 | } else if (err > 0) { |
1a29321e JHS |
78 | if (bind)/* dont override defaults */ |
79 | return 0; | |
4e8ddd7f VB |
80 | if (!ovr) { |
81 | tcf_idr_release(*a, bind); | |
eb4d4065 | 82 | return -EEXIST; |
4e8ddd7f | 83 | } |
0190c1d4 VB |
84 | } else { |
85 | return err; | |
eb4d4065 GB |
86 | } |
87 | ||
f5c29d83 DC |
88 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
89 | if (err < 0) | |
90 | goto release_idr; | |
91 | ||
a85a970a | 92 | p = to_tcf_csum(*a); |
9c5f69bb DC |
93 | |
94 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); | |
95 | if (unlikely(!params_new)) { | |
f5c29d83 DC |
96 | err = -ENOMEM; |
97 | goto put_chain; | |
9c5f69bb | 98 | } |
b6a2b971 | 99 | params_new->update_flags = parm->update_flags; |
9c5f69bb | 100 | |
653cd284 | 101 | spin_lock_bh(&p->tcf_lock); |
f5c29d83 | 102 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
b6a2b971 VB |
103 | rcu_swap_protected(p->params, params_new, |
104 | lockdep_is_held(&p->tcf_lock)); | |
653cd284 | 105 | spin_unlock_bh(&p->tcf_lock); |
b6a2b971 | 106 | |
f5c29d83 DC |
107 | if (goto_ch) |
108 | tcf_chain_put_by_act(goto_ch); | |
b6a2b971 VB |
109 | if (params_new) |
110 | kfree_rcu(params_new, rcu); | |
eb4d4065 GB |
111 | |
112 | if (ret == ACT_P_CREATED) | |
65a206c0 | 113 | tcf_idr_insert(tn, *a); |
eb4d4065 GB |
114 | |
115 | return ret; | |
f5c29d83 DC |
116 | put_chain: |
117 | if (goto_ch) | |
118 | tcf_chain_put_by_act(goto_ch); | |
119 | release_idr: | |
120 | tcf_idr_release(*a, bind); | |
121 | return err; | |
eb4d4065 GB |
122 | } |
123 | ||
eb4d4065 GB |
124 | /** |
125 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
126 | * @skb: sk_buff to use | |
127 | * @ihl: previous summed headers length | |
128 | * @ipl: complete packet length | |
129 | * @jhl: next header length | |
130 | * | |
131 | * Check the expected next layer availability in the specified sk_buff. | |
132 | * Return the next layer pointer if pass, NULL otherwise. | |
133 | */ | |
134 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
135 | unsigned int ihl, unsigned int ipl, | |
136 | unsigned int jhl) | |
137 | { | |
138 | int ntkoff = skb_network_offset(skb); | |
139 | int hl = ihl + jhl; | |
140 | ||
141 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 142 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
143 | return NULL; |
144 | else | |
145 | return (void *)(skb_network_header(skb) + ihl); | |
146 | } | |
147 | ||
5a7a5555 JHS |
148 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, |
149 | unsigned int ipl) | |
eb4d4065 GB |
150 | { |
151 | struct icmphdr *icmph; | |
152 | ||
153 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
154 | if (icmph == NULL) | |
155 | return 0; | |
156 | ||
157 | icmph->checksum = 0; | |
158 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
159 | icmph->checksum = csum_fold(skb->csum); | |
160 | ||
161 | skb->ip_summed = CHECKSUM_NONE; | |
162 | ||
163 | return 1; | |
164 | } | |
165 | ||
166 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
167 | unsigned int ihl, unsigned int ipl) | |
168 | { | |
169 | struct igmphdr *igmph; | |
170 | ||
171 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
172 | if (igmph == NULL) | |
173 | return 0; | |
174 | ||
175 | igmph->csum = 0; | |
176 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
177 | igmph->csum = csum_fold(skb->csum); | |
178 | ||
179 | skb->ip_summed = CHECKSUM_NONE; | |
180 | ||
181 | return 1; | |
182 | } | |
183 | ||
5a7a5555 JHS |
184 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, |
185 | unsigned int ipl) | |
eb4d4065 GB |
186 | { |
187 | struct icmp6hdr *icmp6h; | |
d14a489a | 188 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
189 | |
190 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
191 | if (icmp6h == NULL) | |
192 | return 0; | |
193 | ||
d14a489a | 194 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
195 | icmp6h->icmp6_cksum = 0; |
196 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
197 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
198 | ipl - ihl, IPPROTO_ICMPV6, | |
199 | skb->csum); | |
200 | ||
201 | skb->ip_summed = CHECKSUM_NONE; | |
202 | ||
203 | return 1; | |
204 | } | |
205 | ||
5a7a5555 JHS |
206 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, |
207 | unsigned int ipl) | |
eb4d4065 GB |
208 | { |
209 | struct tcphdr *tcph; | |
d14a489a | 210 | const struct iphdr *iph; |
eb4d4065 | 211 | |
add641e7 DC |
212 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
213 | return 1; | |
214 | ||
eb4d4065 GB |
215 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
216 | if (tcph == NULL) | |
217 | return 0; | |
218 | ||
d14a489a | 219 | iph = ip_hdr(skb); |
eb4d4065 GB |
220 | tcph->check = 0; |
221 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
222 | tcph->check = tcp_v4_check(ipl - ihl, | |
223 | iph->saddr, iph->daddr, skb->csum); | |
224 | ||
225 | skb->ip_summed = CHECKSUM_NONE; | |
226 | ||
227 | return 1; | |
228 | } | |
229 | ||
5a7a5555 JHS |
230 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, |
231 | unsigned int ipl) | |
eb4d4065 GB |
232 | { |
233 | struct tcphdr *tcph; | |
d14a489a | 234 | const struct ipv6hdr *ip6h; |
eb4d4065 | 235 | |
add641e7 DC |
236 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
237 | return 1; | |
238 | ||
eb4d4065 GB |
239 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
240 | if (tcph == NULL) | |
241 | return 0; | |
242 | ||
d14a489a | 243 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
244 | tcph->check = 0; |
245 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
246 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
247 | ipl - ihl, IPPROTO_TCP, | |
248 | skb->csum); | |
249 | ||
250 | skb->ip_summed = CHECKSUM_NONE; | |
251 | ||
252 | return 1; | |
253 | } | |
254 | ||
5a7a5555 JHS |
255 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, |
256 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
257 | { |
258 | struct udphdr *udph; | |
d14a489a | 259 | const struct iphdr *iph; |
eb4d4065 GB |
260 | u16 ul; |
261 | ||
0c19f846 WB |
262 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
263 | return 1; | |
264 | ||
0eec32ff CG |
265 | /* |
266 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
267 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
268 | * UDPLITE uses udph->len for another thing, |
269 | * Use iph->tot_len, or just ipl. | |
270 | */ | |
271 | ||
272 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
273 | if (udph == NULL) | |
274 | return 0; | |
275 | ||
d14a489a | 276 | iph = ip_hdr(skb); |
eb4d4065 GB |
277 | ul = ntohs(udph->len); |
278 | ||
279 | if (udplite || udph->check) { | |
280 | ||
281 | udph->check = 0; | |
282 | ||
283 | if (udplite) { | |
284 | if (ul == 0) | |
285 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
286 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
287 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
288 | else |
289 | goto ignore_obscure_skb; | |
290 | } else { | |
291 | if (ul != ipl - ihl) | |
292 | goto ignore_obscure_skb; | |
293 | ||
294 | skb->csum = csum_partial(udph, ul, 0); | |
295 | } | |
296 | ||
297 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
298 | ul, iph->protocol, | |
299 | skb->csum); | |
300 | ||
301 | if (!udph->check) | |
302 | udph->check = CSUM_MANGLED_0; | |
303 | } | |
304 | ||
305 | skb->ip_summed = CHECKSUM_NONE; | |
306 | ||
307 | ignore_obscure_skb: | |
308 | return 1; | |
309 | } | |
310 | ||
5a7a5555 JHS |
311 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, |
312 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
313 | { |
314 | struct udphdr *udph; | |
d14a489a | 315 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
316 | u16 ul; |
317 | ||
0c19f846 WB |
318 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
319 | return 1; | |
320 | ||
0eec32ff CG |
321 | /* |
322 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
323 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
324 | * UDPLITE uses udph->len for another thing, |
325 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
326 | */ | |
327 | ||
328 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
329 | if (udph == NULL) | |
330 | return 0; | |
331 | ||
d14a489a | 332 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
333 | ul = ntohs(udph->len); |
334 | ||
335 | udph->check = 0; | |
336 | ||
337 | if (udplite) { | |
338 | if (ul == 0) | |
339 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
340 | ||
341 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
342 | skb->csum = csum_partial(udph, ul, 0); | |
343 | ||
344 | else | |
345 | goto ignore_obscure_skb; | |
346 | } else { | |
347 | if (ul != ipl - ihl) | |
348 | goto ignore_obscure_skb; | |
349 | ||
350 | skb->csum = csum_partial(udph, ul, 0); | |
351 | } | |
352 | ||
353 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
354 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
355 | skb->csum); | |
356 | ||
357 | if (!udph->check) | |
358 | udph->check = CSUM_MANGLED_0; | |
359 | ||
360 | skb->ip_summed = CHECKSUM_NONE; | |
361 | ||
362 | ignore_obscure_skb: | |
363 | return 1; | |
364 | } | |
365 | ||
c008b33f DC |
366 | static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, |
367 | unsigned int ipl) | |
368 | { | |
369 | struct sctphdr *sctph; | |
370 | ||
1dd27cde | 371 | if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) |
c008b33f DC |
372 | return 1; |
373 | ||
374 | sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); | |
375 | if (!sctph) | |
376 | return 0; | |
377 | ||
378 | sctph->checksum = sctp_compute_cksum(skb, | |
379 | skb_network_offset(skb) + ihl); | |
380 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 381 | skb->csum_not_inet = 0; |
c008b33f DC |
382 | |
383 | return 1; | |
384 | } | |
385 | ||
eb4d4065 GB |
386 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) |
387 | { | |
d14a489a | 388 | const struct iphdr *iph; |
eb4d4065 GB |
389 | int ntkoff; |
390 | ||
391 | ntkoff = skb_network_offset(skb); | |
392 | ||
393 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
394 | goto fail; | |
395 | ||
396 | iph = ip_hdr(skb); | |
397 | ||
398 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
399 | case IPPROTO_ICMP: | |
400 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
401 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
402 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
403 | goto fail; |
404 | break; | |
405 | case IPPROTO_IGMP: | |
406 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
407 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
408 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
409 | goto fail; |
410 | break; | |
411 | case IPPROTO_TCP: | |
412 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 413 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 414 | ntohs(iph->tot_len))) |
eb4d4065 GB |
415 | goto fail; |
416 | break; | |
417 | case IPPROTO_UDP: | |
418 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 419 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 420 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
421 | goto fail; |
422 | break; | |
423 | case IPPROTO_UDPLITE: | |
424 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 425 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 426 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
427 | goto fail; |
428 | break; | |
c008b33f DC |
429 | case IPPROTO_SCTP: |
430 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
431 | !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) | |
432 | goto fail; | |
433 | break; | |
eb4d4065 GB |
434 | } |
435 | ||
436 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 437 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
438 | goto fail; |
439 | ||
d14a489a | 440 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
441 | } |
442 | ||
443 | return 1; | |
444 | ||
445 | fail: | |
446 | return 0; | |
447 | } | |
448 | ||
5a7a5555 JHS |
449 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, |
450 | unsigned int *pl) | |
eb4d4065 GB |
451 | { |
452 | int off, len, optlen; | |
453 | unsigned char *xh = (void *)ip6xh; | |
454 | ||
455 | off = sizeof(*ip6xh); | |
456 | len = ixhl - off; | |
457 | ||
458 | while (len > 1) { | |
0eec32ff | 459 | switch (xh[off]) { |
1de5a71c | 460 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
461 | optlen = 1; |
462 | break; | |
463 | case IPV6_TLV_JUMBO: | |
464 | optlen = xh[off + 1] + 2; | |
465 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
466 | /* wrong jumbo option length/alignment */ | |
467 | return 0; | |
468 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
469 | goto done; | |
470 | default: | |
471 | optlen = xh[off + 1] + 2; | |
472 | if (optlen > len) | |
473 | /* ignore obscure options */ | |
474 | goto done; | |
475 | break; | |
476 | } | |
477 | off += optlen; | |
478 | len -= optlen; | |
479 | } | |
480 | ||
481 | done: | |
482 | return 1; | |
483 | } | |
484 | ||
485 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
486 | { | |
487 | struct ipv6hdr *ip6h; | |
488 | struct ipv6_opt_hdr *ip6xh; | |
489 | unsigned int hl, ixhl; | |
490 | unsigned int pl; | |
491 | int ntkoff; | |
492 | u8 nexthdr; | |
493 | ||
494 | ntkoff = skb_network_offset(skb); | |
495 | ||
496 | hl = sizeof(*ip6h); | |
497 | ||
498 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
499 | goto fail; | |
500 | ||
501 | ip6h = ipv6_hdr(skb); | |
502 | ||
503 | pl = ntohs(ip6h->payload_len); | |
504 | nexthdr = ip6h->nexthdr; | |
505 | ||
506 | do { | |
507 | switch (nexthdr) { | |
508 | case NEXTHDR_FRAGMENT: | |
509 | goto ignore_skb; | |
510 | case NEXTHDR_ROUTING: | |
511 | case NEXTHDR_HOP: | |
512 | case NEXTHDR_DEST: | |
513 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
514 | goto fail; | |
515 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
516 | ixhl = ipv6_optlen(ip6xh); | |
517 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
518 | goto fail; | |
d14a489a | 519 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
520 | if ((nexthdr == NEXTHDR_HOP) && |
521 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
522 | goto fail; | |
523 | nexthdr = ip6xh->nexthdr; | |
524 | hl += ixhl; | |
525 | break; | |
526 | case IPPROTO_ICMPV6: | |
527 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 528 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
529 | hl, pl + sizeof(*ip6h))) |
530 | goto fail; | |
531 | goto done; | |
532 | case IPPROTO_TCP: | |
533 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 534 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
535 | hl, pl + sizeof(*ip6h))) |
536 | goto fail; | |
537 | goto done; | |
538 | case IPPROTO_UDP: | |
539 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 540 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 541 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
542 | goto fail; |
543 | goto done; | |
544 | case IPPROTO_UDPLITE: | |
545 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 546 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 547 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
548 | goto fail; |
549 | goto done; | |
c008b33f DC |
550 | case IPPROTO_SCTP: |
551 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
552 | !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) | |
553 | goto fail; | |
554 | goto done; | |
eb4d4065 GB |
555 | default: |
556 | goto ignore_skb; | |
557 | } | |
558 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
559 | ||
560 | done: | |
561 | ignore_skb: | |
562 | return 1; | |
563 | ||
564 | fail: | |
565 | return 0; | |
566 | } | |
567 | ||
c831549c JHS |
568 | static int tcf_csum_act(struct sk_buff *skb, const struct tc_action *a, |
569 | struct tcf_result *res) | |
eb4d4065 | 570 | { |
a85a970a | 571 | struct tcf_csum *p = to_tcf_csum(a); |
2ecba2d1 EB |
572 | bool orig_vlan_tag_present = false; |
573 | unsigned int vlan_hdr_count = 0; | |
9c5f69bb | 574 | struct tcf_csum_params *params; |
eb4d4065 | 575 | u32 update_flags; |
2ecba2d1 | 576 | __be16 protocol; |
9c5f69bb DC |
577 | int action; |
578 | ||
7fd4b288 | 579 | params = rcu_dereference_bh(p->params); |
eb4d4065 | 580 | |
9c4a4e48 | 581 | tcf_lastuse_update(&p->tcf_tm); |
f6052cf2 | 582 | bstats_cpu_update(this_cpu_ptr(p->common.cpu_bstats), skb); |
eb4d4065 | 583 | |
11a245e2 | 584 | action = READ_ONCE(p->tcf_action); |
eb4d4065 | 585 | if (unlikely(action == TC_ACT_SHOT)) |
7fd4b288 | 586 | goto drop; |
eb4d4065 | 587 | |
9c5f69bb | 588 | update_flags = params->update_flags; |
2ecba2d1 EB |
589 | protocol = tc_skb_protocol(skb); |
590 | again: | |
591 | switch (protocol) { | |
eb4d4065 GB |
592 | case cpu_to_be16(ETH_P_IP): |
593 | if (!tcf_csum_ipv4(skb, update_flags)) | |
594 | goto drop; | |
595 | break; | |
596 | case cpu_to_be16(ETH_P_IPV6): | |
597 | if (!tcf_csum_ipv6(skb, update_flags)) | |
598 | goto drop; | |
599 | break; | |
2ecba2d1 EB |
600 | case cpu_to_be16(ETH_P_8021AD): /* fall through */ |
601 | case cpu_to_be16(ETH_P_8021Q): | |
602 | if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) { | |
603 | protocol = skb->protocol; | |
604 | orig_vlan_tag_present = true; | |
605 | } else { | |
606 | struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data; | |
607 | ||
608 | protocol = vlan->h_vlan_encapsulated_proto; | |
609 | skb_pull(skb, VLAN_HLEN); | |
610 | skb_reset_network_header(skb); | |
611 | vlan_hdr_count++; | |
612 | } | |
613 | goto again; | |
614 | } | |
615 | ||
616 | out: | |
617 | /* Restore the skb for the pulled VLAN tags */ | |
618 | while (vlan_hdr_count--) { | |
619 | skb_push(skb, VLAN_HLEN); | |
620 | skb_reset_network_header(skb); | |
eb4d4065 GB |
621 | } |
622 | ||
623 | return action; | |
624 | ||
625 | drop: | |
f6052cf2 | 626 | qstats_drop_inc(this_cpu_ptr(p->common.cpu_qstats)); |
2ecba2d1 EB |
627 | action = TC_ACT_SHOT; |
628 | goto out; | |
eb4d4065 GB |
629 | } |
630 | ||
5a7a5555 JHS |
631 | static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
632 | int ref) | |
eb4d4065 GB |
633 | { |
634 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 635 | struct tcf_csum *p = to_tcf_csum(a); |
9c5f69bb | 636 | struct tcf_csum_params *params; |
eb4d4065 | 637 | struct tc_csum opt = { |
eb4d4065 | 638 | .index = p->tcf_index, |
036bb443 VB |
639 | .refcnt = refcount_read(&p->tcf_refcnt) - ref, |
640 | .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, | |
eb4d4065 GB |
641 | }; |
642 | struct tcf_t t; | |
643 | ||
653cd284 | 644 | spin_lock_bh(&p->tcf_lock); |
b6a2b971 VB |
645 | params = rcu_dereference_protected(p->params, |
646 | lockdep_is_held(&p->tcf_lock)); | |
647 | opt.action = p->tcf_action; | |
9c5f69bb DC |
648 | opt.update_flags = params->update_flags; |
649 | ||
1b34ec43 DM |
650 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
651 | goto nla_put_failure; | |
48d8ee16 JHS |
652 | |
653 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 654 | if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) |
1b34ec43 | 655 | goto nla_put_failure; |
653cd284 | 656 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
657 | |
658 | return skb->len; | |
659 | ||
660 | nla_put_failure: | |
653cd284 | 661 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
662 | nlmsg_trim(skb, b); |
663 | return -1; | |
664 | } | |
665 | ||
9c5f69bb DC |
666 | static void tcf_csum_cleanup(struct tc_action *a) |
667 | { | |
668 | struct tcf_csum *p = to_tcf_csum(a); | |
669 | struct tcf_csum_params *params; | |
670 | ||
671 | params = rcu_dereference_protected(p->params, 1); | |
aab378a7 DC |
672 | if (params) |
673 | kfree_rcu(params, rcu); | |
9c5f69bb DC |
674 | } |
675 | ||
ddf97ccd WC |
676 | static int tcf_csum_walker(struct net *net, struct sk_buff *skb, |
677 | struct netlink_callback *cb, int type, | |
41780105 AA |
678 | const struct tc_action_ops *ops, |
679 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
680 | { |
681 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
682 | ||
b3620145 | 683 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
684 | } |
685 | ||
f061b48c | 686 | static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
687 | { |
688 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
689 | ||
65a206c0 | 690 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
691 | } |
692 | ||
29e6eee1 CD |
693 | static size_t tcf_csum_get_fill_size(const struct tc_action *act) |
694 | { | |
695 | return nla_total_size(sizeof(struct tc_csum)); | |
696 | } | |
697 | ||
eb4d4065 | 698 | static struct tc_action_ops act_csum_ops = { |
0eec32ff | 699 | .kind = "csum", |
eddd2cf1 | 700 | .id = TCA_ID_CSUM, |
0eec32ff | 701 | .owner = THIS_MODULE, |
c831549c | 702 | .act = tcf_csum_act, |
0eec32ff | 703 | .dump = tcf_csum_dump, |
0eec32ff | 704 | .init = tcf_csum_init, |
9c5f69bb | 705 | .cleanup = tcf_csum_cleanup, |
ddf97ccd WC |
706 | .walk = tcf_csum_walker, |
707 | .lookup = tcf_csum_search, | |
29e6eee1 | 708 | .get_fill_size = tcf_csum_get_fill_size, |
a85a970a | 709 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
710 | }; |
711 | ||
712 | static __net_init int csum_init_net(struct net *net) | |
713 | { | |
714 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
715 | ||
c7e460ce | 716 | return tc_action_net_init(tn, &act_csum_ops); |
ddf97ccd WC |
717 | } |
718 | ||
039af9c6 | 719 | static void __net_exit csum_exit_net(struct list_head *net_list) |
ddf97ccd | 720 | { |
039af9c6 | 721 | tc_action_net_exit(net_list, csum_net_id); |
ddf97ccd WC |
722 | } |
723 | ||
724 | static struct pernet_operations csum_net_ops = { | |
725 | .init = csum_init_net, | |
039af9c6 | 726 | .exit_batch = csum_exit_net, |
ddf97ccd WC |
727 | .id = &csum_net_id, |
728 | .size = sizeof(struct tc_action_net), | |
eb4d4065 GB |
729 | }; |
730 | ||
731 | MODULE_DESCRIPTION("Checksum updating actions"); | |
732 | MODULE_LICENSE("GPL"); | |
733 | ||
734 | static int __init csum_init_module(void) | |
735 | { | |
ddf97ccd | 736 | return tcf_register_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
737 | } |
738 | ||
739 | static void __exit csum_cleanup_module(void) | |
740 | { | |
ddf97ccd | 741 | tcf_unregister_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
742 | } |
743 | ||
744 | module_init(csum_init_module); | |
745 | module_exit(csum_cleanup_module); |