Commit | Line | Data |
---|---|---|
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, | |
695176bf CW |
44 | struct nlattr *est, struct tc_action **a, |
45 | struct tcf_proto *tp, | |
abbb0d33 | 46 | u32 flags, struct netlink_ext_ack *extack) |
eb4d4065 | 47 | { |
ddf97ccd | 48 | struct tc_action_net *tn = net_generic(net, csum_net_id); |
695176bf | 49 | bool bind = flags & TCA_ACT_FLAGS_BIND; |
b6a2b971 | 50 | struct tcf_csum_params *params_new; |
eb4d4065 | 51 | struct nlattr *tb[TCA_CSUM_MAX + 1]; |
f5c29d83 | 52 | struct tcf_chain *goto_ch = NULL; |
eb4d4065 | 53 | struct tc_csum *parm; |
eb4d4065 GB |
54 | struct tcf_csum *p; |
55 | int ret = 0, err; | |
7be8ef2c | 56 | u32 index; |
eb4d4065 GB |
57 | |
58 | if (nla == NULL) | |
59 | return -EINVAL; | |
60 | ||
8cb08174 JB |
61 | err = nla_parse_nested_deprecated(tb, TCA_CSUM_MAX, nla, csum_policy, |
62 | 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]); | |
7be8ef2c DL |
69 | index = parm->index; |
70 | err = tcf_idr_check_alloc(tn, &index, a, bind); | |
0190c1d4 | 71 | if (!err) { |
e3822678 VB |
72 | ret = tcf_idr_create_from_flags(tn, index, est, a, |
73 | &act_csum_ops, bind, flags); | |
0190c1d4 | 74 | if (ret) { |
7be8ef2c | 75 | tcf_idr_cleanup(tn, 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; | |
695176bf | 82 | if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
4e8ddd7f | 83 | tcf_idr_release(*a, bind); |
eb4d4065 | 84 | return -EEXIST; |
4e8ddd7f | 85 | } |
0190c1d4 VB |
86 | } else { |
87 | return err; | |
eb4d4065 GB |
88 | } |
89 | ||
f5c29d83 DC |
90 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
91 | if (err < 0) | |
92 | goto release_idr; | |
93 | ||
a85a970a | 94 | p = to_tcf_csum(*a); |
9c5f69bb DC |
95 | |
96 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); | |
97 | if (unlikely(!params_new)) { | |
f5c29d83 DC |
98 | err = -ENOMEM; |
99 | goto put_chain; | |
9c5f69bb | 100 | } |
b6a2b971 | 101 | params_new->update_flags = parm->update_flags; |
9c5f69bb | 102 | |
653cd284 | 103 | spin_lock_bh(&p->tcf_lock); |
f5c29d83 | 104 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
445d3749 PM |
105 | params_new = rcu_replace_pointer(p->params, params_new, |
106 | lockdep_is_held(&p->tcf_lock)); | |
653cd284 | 107 | spin_unlock_bh(&p->tcf_lock); |
b6a2b971 | 108 | |
f5c29d83 DC |
109 | if (goto_ch) |
110 | tcf_chain_put_by_act(goto_ch); | |
b6a2b971 VB |
111 | if (params_new) |
112 | kfree_rcu(params_new, rcu); | |
eb4d4065 | 113 | |
eb4d4065 | 114 | return ret; |
f5c29d83 DC |
115 | put_chain: |
116 | if (goto_ch) | |
117 | tcf_chain_put_by_act(goto_ch); | |
118 | release_idr: | |
119 | tcf_idr_release(*a, bind); | |
120 | return err; | |
eb4d4065 GB |
121 | } |
122 | ||
eb4d4065 GB |
123 | /** |
124 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
125 | * @skb: sk_buff to use | |
126 | * @ihl: previous summed headers length | |
127 | * @ipl: complete packet length | |
128 | * @jhl: next header length | |
129 | * | |
130 | * Check the expected next layer availability in the specified sk_buff. | |
131 | * Return the next layer pointer if pass, NULL otherwise. | |
132 | */ | |
133 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
134 | unsigned int ihl, unsigned int ipl, | |
135 | unsigned int jhl) | |
136 | { | |
137 | int ntkoff = skb_network_offset(skb); | |
138 | int hl = ihl + jhl; | |
139 | ||
140 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 141 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
142 | return NULL; |
143 | else | |
144 | return (void *)(skb_network_header(skb) + ihl); | |
145 | } | |
146 | ||
5a7a5555 JHS |
147 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, |
148 | unsigned int ipl) | |
eb4d4065 GB |
149 | { |
150 | struct icmphdr *icmph; | |
151 | ||
152 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
153 | if (icmph == NULL) | |
154 | return 0; | |
155 | ||
156 | icmph->checksum = 0; | |
157 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
158 | icmph->checksum = csum_fold(skb->csum); | |
159 | ||
160 | skb->ip_summed = CHECKSUM_NONE; | |
161 | ||
162 | return 1; | |
163 | } | |
164 | ||
165 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
166 | unsigned int ihl, unsigned int ipl) | |
167 | { | |
168 | struct igmphdr *igmph; | |
169 | ||
170 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
171 | if (igmph == NULL) | |
172 | return 0; | |
173 | ||
174 | igmph->csum = 0; | |
175 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
176 | igmph->csum = csum_fold(skb->csum); | |
177 | ||
178 | skb->ip_summed = CHECKSUM_NONE; | |
179 | ||
180 | return 1; | |
181 | } | |
182 | ||
5a7a5555 JHS |
183 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, |
184 | unsigned int ipl) | |
eb4d4065 GB |
185 | { |
186 | struct icmp6hdr *icmp6h; | |
d14a489a | 187 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
188 | |
189 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
190 | if (icmp6h == NULL) | |
191 | return 0; | |
192 | ||
d14a489a | 193 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
194 | icmp6h->icmp6_cksum = 0; |
195 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
196 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
197 | ipl - ihl, IPPROTO_ICMPV6, | |
198 | skb->csum); | |
199 | ||
200 | skb->ip_summed = CHECKSUM_NONE; | |
201 | ||
202 | return 1; | |
203 | } | |
204 | ||
5a7a5555 JHS |
205 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, |
206 | unsigned int ipl) | |
eb4d4065 GB |
207 | { |
208 | struct tcphdr *tcph; | |
d14a489a | 209 | const struct iphdr *iph; |
eb4d4065 | 210 | |
add641e7 DC |
211 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
212 | return 1; | |
213 | ||
eb4d4065 GB |
214 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
215 | if (tcph == NULL) | |
216 | return 0; | |
217 | ||
d14a489a | 218 | iph = ip_hdr(skb); |
eb4d4065 GB |
219 | tcph->check = 0; |
220 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
221 | tcph->check = tcp_v4_check(ipl - ihl, | |
222 | iph->saddr, iph->daddr, skb->csum); | |
223 | ||
224 | skb->ip_summed = CHECKSUM_NONE; | |
225 | ||
226 | return 1; | |
227 | } | |
228 | ||
5a7a5555 JHS |
229 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, |
230 | unsigned int ipl) | |
eb4d4065 GB |
231 | { |
232 | struct tcphdr *tcph; | |
d14a489a | 233 | const struct ipv6hdr *ip6h; |
eb4d4065 | 234 | |
add641e7 DC |
235 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
236 | return 1; | |
237 | ||
eb4d4065 GB |
238 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
239 | if (tcph == NULL) | |
240 | return 0; | |
241 | ||
d14a489a | 242 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
243 | tcph->check = 0; |
244 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
245 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
246 | ipl - ihl, IPPROTO_TCP, | |
247 | skb->csum); | |
248 | ||
249 | skb->ip_summed = CHECKSUM_NONE; | |
250 | ||
251 | return 1; | |
252 | } | |
253 | ||
5a7a5555 JHS |
254 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, |
255 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
256 | { |
257 | struct udphdr *udph; | |
d14a489a | 258 | const struct iphdr *iph; |
eb4d4065 GB |
259 | u16 ul; |
260 | ||
0c19f846 WB |
261 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
262 | return 1; | |
263 | ||
0eec32ff CG |
264 | /* |
265 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
266 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
267 | * UDPLITE uses udph->len for another thing, |
268 | * Use iph->tot_len, or just ipl. | |
269 | */ | |
270 | ||
271 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
272 | if (udph == NULL) | |
273 | return 0; | |
274 | ||
d14a489a | 275 | iph = ip_hdr(skb); |
eb4d4065 GB |
276 | ul = ntohs(udph->len); |
277 | ||
278 | if (udplite || udph->check) { | |
279 | ||
280 | udph->check = 0; | |
281 | ||
282 | if (udplite) { | |
283 | if (ul == 0) | |
284 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
285 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
286 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
287 | else |
288 | goto ignore_obscure_skb; | |
289 | } else { | |
290 | if (ul != ipl - ihl) | |
291 | goto ignore_obscure_skb; | |
292 | ||
293 | skb->csum = csum_partial(udph, ul, 0); | |
294 | } | |
295 | ||
296 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
297 | ul, iph->protocol, | |
298 | skb->csum); | |
299 | ||
300 | if (!udph->check) | |
301 | udph->check = CSUM_MANGLED_0; | |
302 | } | |
303 | ||
304 | skb->ip_summed = CHECKSUM_NONE; | |
305 | ||
306 | ignore_obscure_skb: | |
307 | return 1; | |
308 | } | |
309 | ||
5a7a5555 JHS |
310 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, |
311 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
312 | { |
313 | struct udphdr *udph; | |
d14a489a | 314 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
315 | u16 ul; |
316 | ||
0c19f846 WB |
317 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
318 | return 1; | |
319 | ||
0eec32ff CG |
320 | /* |
321 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
322 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
323 | * UDPLITE uses udph->len for another thing, |
324 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
325 | */ | |
326 | ||
327 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
328 | if (udph == NULL) | |
329 | return 0; | |
330 | ||
d14a489a | 331 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
332 | ul = ntohs(udph->len); |
333 | ||
334 | udph->check = 0; | |
335 | ||
336 | if (udplite) { | |
337 | if (ul == 0) | |
338 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
339 | ||
340 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
341 | skb->csum = csum_partial(udph, ul, 0); | |
342 | ||
343 | else | |
344 | goto ignore_obscure_skb; | |
345 | } else { | |
346 | if (ul != ipl - ihl) | |
347 | goto ignore_obscure_skb; | |
348 | ||
349 | skb->csum = csum_partial(udph, ul, 0); | |
350 | } | |
351 | ||
352 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
353 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
354 | skb->csum); | |
355 | ||
356 | if (!udph->check) | |
357 | udph->check = CSUM_MANGLED_0; | |
358 | ||
359 | skb->ip_summed = CHECKSUM_NONE; | |
360 | ||
361 | ignore_obscure_skb: | |
362 | return 1; | |
363 | } | |
364 | ||
c008b33f DC |
365 | static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, |
366 | unsigned int ipl) | |
367 | { | |
368 | struct sctphdr *sctph; | |
369 | ||
1dd27cde | 370 | if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) |
c008b33f DC |
371 | return 1; |
372 | ||
373 | sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); | |
374 | if (!sctph) | |
375 | return 0; | |
376 | ||
377 | sctph->checksum = sctp_compute_cksum(skb, | |
378 | skb_network_offset(skb) + ihl); | |
379 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 380 | skb->csum_not_inet = 0; |
c008b33f DC |
381 | |
382 | return 1; | |
383 | } | |
384 | ||
eb4d4065 GB |
385 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) |
386 | { | |
d14a489a | 387 | const struct iphdr *iph; |
eb4d4065 GB |
388 | int ntkoff; |
389 | ||
390 | ntkoff = skb_network_offset(skb); | |
391 | ||
392 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
393 | goto fail; | |
394 | ||
395 | iph = ip_hdr(skb); | |
396 | ||
397 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
398 | case IPPROTO_ICMP: | |
399 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
400 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
401 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
402 | goto fail; |
403 | break; | |
404 | case IPPROTO_IGMP: | |
405 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
406 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
407 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
408 | goto fail; |
409 | break; | |
410 | case IPPROTO_TCP: | |
411 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 412 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 413 | ntohs(iph->tot_len))) |
eb4d4065 GB |
414 | goto fail; |
415 | break; | |
416 | case IPPROTO_UDP: | |
417 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 418 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 419 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
420 | goto fail; |
421 | break; | |
422 | case IPPROTO_UDPLITE: | |
423 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 424 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 425 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
426 | goto fail; |
427 | break; | |
c008b33f DC |
428 | case IPPROTO_SCTP: |
429 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
430 | !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) | |
431 | goto fail; | |
432 | break; | |
eb4d4065 GB |
433 | } |
434 | ||
435 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 436 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
437 | goto fail; |
438 | ||
d14a489a | 439 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
440 | } |
441 | ||
442 | return 1; | |
443 | ||
444 | fail: | |
445 | return 0; | |
446 | } | |
447 | ||
5a7a5555 JHS |
448 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, |
449 | unsigned int *pl) | |
eb4d4065 GB |
450 | { |
451 | int off, len, optlen; | |
452 | unsigned char *xh = (void *)ip6xh; | |
453 | ||
454 | off = sizeof(*ip6xh); | |
455 | len = ixhl - off; | |
456 | ||
457 | while (len > 1) { | |
0eec32ff | 458 | switch (xh[off]) { |
1de5a71c | 459 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
460 | optlen = 1; |
461 | break; | |
462 | case IPV6_TLV_JUMBO: | |
463 | optlen = xh[off + 1] + 2; | |
464 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
465 | /* wrong jumbo option length/alignment */ | |
466 | return 0; | |
467 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
468 | goto done; | |
469 | default: | |
470 | optlen = xh[off + 1] + 2; | |
471 | if (optlen > len) | |
472 | /* ignore obscure options */ | |
473 | goto done; | |
474 | break; | |
475 | } | |
476 | off += optlen; | |
477 | len -= optlen; | |
478 | } | |
479 | ||
480 | done: | |
481 | return 1; | |
482 | } | |
483 | ||
484 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
485 | { | |
486 | struct ipv6hdr *ip6h; | |
487 | struct ipv6_opt_hdr *ip6xh; | |
488 | unsigned int hl, ixhl; | |
489 | unsigned int pl; | |
490 | int ntkoff; | |
491 | u8 nexthdr; | |
492 | ||
493 | ntkoff = skb_network_offset(skb); | |
494 | ||
495 | hl = sizeof(*ip6h); | |
496 | ||
497 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
498 | goto fail; | |
499 | ||
500 | ip6h = ipv6_hdr(skb); | |
501 | ||
502 | pl = ntohs(ip6h->payload_len); | |
503 | nexthdr = ip6h->nexthdr; | |
504 | ||
505 | do { | |
506 | switch (nexthdr) { | |
507 | case NEXTHDR_FRAGMENT: | |
508 | goto ignore_skb; | |
509 | case NEXTHDR_ROUTING: | |
510 | case NEXTHDR_HOP: | |
511 | case NEXTHDR_DEST: | |
512 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
513 | goto fail; | |
514 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
515 | ixhl = ipv6_optlen(ip6xh); | |
516 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
517 | goto fail; | |
d14a489a | 518 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
519 | if ((nexthdr == NEXTHDR_HOP) && |
520 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
521 | goto fail; | |
522 | nexthdr = ip6xh->nexthdr; | |
523 | hl += ixhl; | |
524 | break; | |
525 | case IPPROTO_ICMPV6: | |
526 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 527 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
528 | hl, pl + sizeof(*ip6h))) |
529 | goto fail; | |
530 | goto done; | |
531 | case IPPROTO_TCP: | |
532 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 533 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
534 | hl, pl + sizeof(*ip6h))) |
535 | goto fail; | |
536 | goto done; | |
537 | case IPPROTO_UDP: | |
538 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 539 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 540 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
541 | goto fail; |
542 | goto done; | |
543 | case IPPROTO_UDPLITE: | |
544 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 545 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 546 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
547 | goto fail; |
548 | goto done; | |
c008b33f DC |
549 | case IPPROTO_SCTP: |
550 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
551 | !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) | |
552 | goto fail; | |
553 | goto done; | |
eb4d4065 GB |
554 | default: |
555 | goto ignore_skb; | |
556 | } | |
557 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
558 | ||
559 | done: | |
560 | ignore_skb: | |
561 | return 1; | |
562 | ||
563 | fail: | |
564 | return 0; | |
565 | } | |
566 | ||
c831549c JHS |
567 | static int tcf_csum_act(struct sk_buff *skb, const struct tc_action *a, |
568 | struct tcf_result *res) | |
eb4d4065 | 569 | { |
a85a970a | 570 | struct tcf_csum *p = to_tcf_csum(a); |
2ecba2d1 EB |
571 | bool orig_vlan_tag_present = false; |
572 | unsigned int vlan_hdr_count = 0; | |
9c5f69bb | 573 | struct tcf_csum_params *params; |
eb4d4065 | 574 | u32 update_flags; |
2ecba2d1 | 575 | __be16 protocol; |
9c5f69bb DC |
576 | int action; |
577 | ||
7fd4b288 | 578 | params = rcu_dereference_bh(p->params); |
eb4d4065 | 579 | |
9c4a4e48 | 580 | tcf_lastuse_update(&p->tcf_tm); |
5e1ad95b | 581 | tcf_action_update_bstats(&p->common, skb); |
eb4d4065 | 582 | |
11a245e2 | 583 | action = READ_ONCE(p->tcf_action); |
eb4d4065 | 584 | if (unlikely(action == TC_ACT_SHOT)) |
7fd4b288 | 585 | goto drop; |
eb4d4065 | 586 | |
9c5f69bb | 587 | update_flags = params->update_flags; |
d7bf2ebe | 588 | protocol = skb_protocol(skb, false); |
2ecba2d1 EB |
589 | again: |
590 | switch (protocol) { | |
eb4d4065 GB |
591 | case cpu_to_be16(ETH_P_IP): |
592 | if (!tcf_csum_ipv4(skb, update_flags)) | |
593 | goto drop; | |
594 | break; | |
595 | case cpu_to_be16(ETH_P_IPV6): | |
596 | if (!tcf_csum_ipv6(skb, update_flags)) | |
597 | goto drop; | |
598 | break; | |
964201de GS |
599 | case cpu_to_be16(ETH_P_8021AD): |
600 | fallthrough; | |
2ecba2d1 EB |
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: | |
26b537a8 | 626 | tcf_action_inc_drop_qstats(&p->common); |
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 | ||
c54e1d92 | 698 | static int tcf_csum_offload_act_setup(struct tc_action *act, void *entry_data, |
c2ccf84e IS |
699 | u32 *index_inc, bool bind, |
700 | struct netlink_ext_ack *extack) | |
c54e1d92 BZ |
701 | { |
702 | if (bind) { | |
703 | struct flow_action_entry *entry = entry_data; | |
704 | ||
705 | entry->id = FLOW_ACTION_CSUM; | |
706 | entry->csum_flags = tcf_csum_update_flags(act); | |
707 | *index_inc = 1; | |
708 | } else { | |
8cbfe939 BZ |
709 | struct flow_offload_action *fl_action = entry_data; |
710 | ||
711 | fl_action->id = FLOW_ACTION_CSUM; | |
c54e1d92 BZ |
712 | } |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
eb4d4065 | 717 | static struct tc_action_ops act_csum_ops = { |
0eec32ff | 718 | .kind = "csum", |
eddd2cf1 | 719 | .id = TCA_ID_CSUM, |
0eec32ff | 720 | .owner = THIS_MODULE, |
c831549c | 721 | .act = tcf_csum_act, |
0eec32ff | 722 | .dump = tcf_csum_dump, |
0eec32ff | 723 | .init = tcf_csum_init, |
9c5f69bb | 724 | .cleanup = tcf_csum_cleanup, |
ddf97ccd WC |
725 | .walk = tcf_csum_walker, |
726 | .lookup = tcf_csum_search, | |
29e6eee1 | 727 | .get_fill_size = tcf_csum_get_fill_size, |
c54e1d92 | 728 | .offload_act_setup = tcf_csum_offload_act_setup, |
a85a970a | 729 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
730 | }; |
731 | ||
732 | static __net_init int csum_init_net(struct net *net) | |
733 | { | |
734 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
735 | ||
981471bd | 736 | return tc_action_net_init(net, tn, &act_csum_ops); |
ddf97ccd WC |
737 | } |
738 | ||
039af9c6 | 739 | static void __net_exit csum_exit_net(struct list_head *net_list) |
ddf97ccd | 740 | { |
039af9c6 | 741 | tc_action_net_exit(net_list, csum_net_id); |
ddf97ccd WC |
742 | } |
743 | ||
744 | static struct pernet_operations csum_net_ops = { | |
745 | .init = csum_init_net, | |
039af9c6 | 746 | .exit_batch = csum_exit_net, |
ddf97ccd WC |
747 | .id = &csum_net_id, |
748 | .size = sizeof(struct tc_action_net), | |
eb4d4065 GB |
749 | }; |
750 | ||
751 | MODULE_DESCRIPTION("Checksum updating actions"); | |
752 | MODULE_LICENSE("GPL"); | |
753 | ||
754 | static int __init csum_init_module(void) | |
755 | { | |
ddf97ccd | 756 | return tcf_register_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
757 | } |
758 | ||
759 | static void __exit csum_cleanup_module(void) | |
760 | { | |
ddf97ccd | 761 | tcf_unregister_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
762 | } |
763 | ||
764 | module_init(csum_init_module); | |
765 | module_exit(csum_cleanup_module); |