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 | ||
a85a970a | 40 | static struct tc_action_ops act_csum_ops; |
ddf97ccd WC |
41 | |
42 | static int tcf_csum_init(struct net *net, struct nlattr *nla, | |
695176bf CW |
43 | struct nlattr *est, struct tc_action **a, |
44 | struct tcf_proto *tp, | |
abbb0d33 | 45 | u32 flags, struct netlink_ext_ack *extack) |
eb4d4065 | 46 | { |
acd0a7ab | 47 | struct tc_action_net *tn = net_generic(net, act_csum_ops.net_id); |
695176bf | 48 | bool bind = flags & TCA_ACT_FLAGS_BIND; |
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; | |
7be8ef2c | 55 | u32 index; |
eb4d4065 GB |
56 | |
57 | if (nla == NULL) | |
58 | return -EINVAL; | |
59 | ||
8cb08174 JB |
60 | err = nla_parse_nested_deprecated(tb, TCA_CSUM_MAX, nla, csum_policy, |
61 | NULL); | |
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]); | |
7be8ef2c DL |
68 | index = parm->index; |
69 | err = tcf_idr_check_alloc(tn, &index, a, bind); | |
0190c1d4 | 70 | if (!err) { |
e3822678 VB |
71 | ret = tcf_idr_create_from_flags(tn, index, est, a, |
72 | &act_csum_ops, bind, flags); | |
0190c1d4 | 73 | if (ret) { |
7be8ef2c | 74 | tcf_idr_cleanup(tn, index); |
86062033 | 75 | return ret; |
0190c1d4 | 76 | } |
eb4d4065 | 77 | ret = ACT_P_CREATED; |
0190c1d4 | 78 | } else if (err > 0) { |
1a29321e JHS |
79 | if (bind)/* dont override defaults */ |
80 | return 0; | |
695176bf | 81 | if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
4e8ddd7f | 82 | tcf_idr_release(*a, bind); |
eb4d4065 | 83 | return -EEXIST; |
4e8ddd7f | 84 | } |
0190c1d4 VB |
85 | } else { |
86 | return err; | |
eb4d4065 GB |
87 | } |
88 | ||
f5c29d83 DC |
89 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
90 | if (err < 0) | |
91 | goto release_idr; | |
92 | ||
a85a970a | 93 | p = to_tcf_csum(*a); |
9c5f69bb DC |
94 | |
95 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); | |
96 | if (unlikely(!params_new)) { | |
f5c29d83 DC |
97 | err = -ENOMEM; |
98 | goto put_chain; | |
9c5f69bb | 99 | } |
b6a2b971 | 100 | params_new->update_flags = parm->update_flags; |
9c5f69bb | 101 | |
653cd284 | 102 | spin_lock_bh(&p->tcf_lock); |
f5c29d83 | 103 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
445d3749 PM |
104 | params_new = rcu_replace_pointer(p->params, params_new, |
105 | lockdep_is_held(&p->tcf_lock)); | |
653cd284 | 106 | spin_unlock_bh(&p->tcf_lock); |
b6a2b971 | 107 | |
f5c29d83 DC |
108 | if (goto_ch) |
109 | tcf_chain_put_by_act(goto_ch); | |
b6a2b971 VB |
110 | if (params_new) |
111 | kfree_rcu(params_new, rcu); | |
eb4d4065 | 112 | |
eb4d4065 | 113 | return ret; |
f5c29d83 DC |
114 | put_chain: |
115 | if (goto_ch) | |
116 | tcf_chain_put_by_act(goto_ch); | |
117 | release_idr: | |
118 | tcf_idr_release(*a, bind); | |
119 | return err; | |
eb4d4065 GB |
120 | } |
121 | ||
eb4d4065 GB |
122 | /** |
123 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
124 | * @skb: sk_buff to use | |
125 | * @ihl: previous summed headers length | |
126 | * @ipl: complete packet length | |
127 | * @jhl: next header length | |
128 | * | |
129 | * Check the expected next layer availability in the specified sk_buff. | |
130 | * Return the next layer pointer if pass, NULL otherwise. | |
131 | */ | |
132 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
133 | unsigned int ihl, unsigned int ipl, | |
134 | unsigned int jhl) | |
135 | { | |
136 | int ntkoff = skb_network_offset(skb); | |
137 | int hl = ihl + jhl; | |
138 | ||
139 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 140 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
141 | return NULL; |
142 | else | |
143 | return (void *)(skb_network_header(skb) + ihl); | |
144 | } | |
145 | ||
5a7a5555 JHS |
146 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, |
147 | unsigned int ipl) | |
eb4d4065 GB |
148 | { |
149 | struct icmphdr *icmph; | |
150 | ||
151 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
152 | if (icmph == NULL) | |
153 | return 0; | |
154 | ||
155 | icmph->checksum = 0; | |
156 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
157 | icmph->checksum = csum_fold(skb->csum); | |
158 | ||
159 | skb->ip_summed = CHECKSUM_NONE; | |
160 | ||
161 | return 1; | |
162 | } | |
163 | ||
164 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
165 | unsigned int ihl, unsigned int ipl) | |
166 | { | |
167 | struct igmphdr *igmph; | |
168 | ||
169 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
170 | if (igmph == NULL) | |
171 | return 0; | |
172 | ||
173 | igmph->csum = 0; | |
174 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
175 | igmph->csum = csum_fold(skb->csum); | |
176 | ||
177 | skb->ip_summed = CHECKSUM_NONE; | |
178 | ||
179 | return 1; | |
180 | } | |
181 | ||
5a7a5555 JHS |
182 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, |
183 | unsigned int ipl) | |
eb4d4065 GB |
184 | { |
185 | struct icmp6hdr *icmp6h; | |
d14a489a | 186 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
187 | |
188 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
189 | if (icmp6h == NULL) | |
190 | return 0; | |
191 | ||
d14a489a | 192 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
193 | icmp6h->icmp6_cksum = 0; |
194 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
195 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
196 | ipl - ihl, IPPROTO_ICMPV6, | |
197 | skb->csum); | |
198 | ||
199 | skb->ip_summed = CHECKSUM_NONE; | |
200 | ||
201 | return 1; | |
202 | } | |
203 | ||
5a7a5555 JHS |
204 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, |
205 | unsigned int ipl) | |
eb4d4065 GB |
206 | { |
207 | struct tcphdr *tcph; | |
d14a489a | 208 | const struct iphdr *iph; |
eb4d4065 | 209 | |
add641e7 DC |
210 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
211 | return 1; | |
212 | ||
eb4d4065 GB |
213 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
214 | if (tcph == NULL) | |
215 | return 0; | |
216 | ||
d14a489a | 217 | iph = ip_hdr(skb); |
eb4d4065 GB |
218 | tcph->check = 0; |
219 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
220 | tcph->check = tcp_v4_check(ipl - ihl, | |
221 | iph->saddr, iph->daddr, skb->csum); | |
222 | ||
223 | skb->ip_summed = CHECKSUM_NONE; | |
224 | ||
225 | return 1; | |
226 | } | |
227 | ||
5a7a5555 JHS |
228 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, |
229 | unsigned int ipl) | |
eb4d4065 GB |
230 | { |
231 | struct tcphdr *tcph; | |
d14a489a | 232 | const struct ipv6hdr *ip6h; |
eb4d4065 | 233 | |
add641e7 DC |
234 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
235 | return 1; | |
236 | ||
eb4d4065 GB |
237 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
238 | if (tcph == NULL) | |
239 | return 0; | |
240 | ||
d14a489a | 241 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
242 | tcph->check = 0; |
243 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
244 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
245 | ipl - ihl, IPPROTO_TCP, | |
246 | skb->csum); | |
247 | ||
248 | skb->ip_summed = CHECKSUM_NONE; | |
249 | ||
250 | return 1; | |
251 | } | |
252 | ||
5a7a5555 JHS |
253 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, |
254 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
255 | { |
256 | struct udphdr *udph; | |
d14a489a | 257 | const struct iphdr *iph; |
eb4d4065 GB |
258 | u16 ul; |
259 | ||
0c19f846 WB |
260 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
261 | return 1; | |
262 | ||
0eec32ff CG |
263 | /* |
264 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
265 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
266 | * UDPLITE uses udph->len for another thing, |
267 | * Use iph->tot_len, or just ipl. | |
268 | */ | |
269 | ||
270 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
271 | if (udph == NULL) | |
272 | return 0; | |
273 | ||
d14a489a | 274 | iph = ip_hdr(skb); |
eb4d4065 GB |
275 | ul = ntohs(udph->len); |
276 | ||
277 | if (udplite || udph->check) { | |
278 | ||
279 | udph->check = 0; | |
280 | ||
281 | if (udplite) { | |
282 | if (ul == 0) | |
283 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
284 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
285 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
286 | else |
287 | goto ignore_obscure_skb; | |
288 | } else { | |
289 | if (ul != ipl - ihl) | |
290 | goto ignore_obscure_skb; | |
291 | ||
292 | skb->csum = csum_partial(udph, ul, 0); | |
293 | } | |
294 | ||
295 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
296 | ul, iph->protocol, | |
297 | skb->csum); | |
298 | ||
299 | if (!udph->check) | |
300 | udph->check = CSUM_MANGLED_0; | |
301 | } | |
302 | ||
303 | skb->ip_summed = CHECKSUM_NONE; | |
304 | ||
305 | ignore_obscure_skb: | |
306 | return 1; | |
307 | } | |
308 | ||
5a7a5555 JHS |
309 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, |
310 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
311 | { |
312 | struct udphdr *udph; | |
d14a489a | 313 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
314 | u16 ul; |
315 | ||
0c19f846 WB |
316 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
317 | return 1; | |
318 | ||
0eec32ff CG |
319 | /* |
320 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
321 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
322 | * UDPLITE uses udph->len for another thing, |
323 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
324 | */ | |
325 | ||
326 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
327 | if (udph == NULL) | |
328 | return 0; | |
329 | ||
d14a489a | 330 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
331 | ul = ntohs(udph->len); |
332 | ||
333 | udph->check = 0; | |
334 | ||
335 | if (udplite) { | |
336 | if (ul == 0) | |
337 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
338 | ||
339 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
340 | skb->csum = csum_partial(udph, ul, 0); | |
341 | ||
342 | else | |
343 | goto ignore_obscure_skb; | |
344 | } else { | |
345 | if (ul != ipl - ihl) | |
346 | goto ignore_obscure_skb; | |
347 | ||
348 | skb->csum = csum_partial(udph, ul, 0); | |
349 | } | |
350 | ||
351 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
352 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
353 | skb->csum); | |
354 | ||
355 | if (!udph->check) | |
356 | udph->check = CSUM_MANGLED_0; | |
357 | ||
358 | skb->ip_summed = CHECKSUM_NONE; | |
359 | ||
360 | ignore_obscure_skb: | |
361 | return 1; | |
362 | } | |
363 | ||
c008b33f DC |
364 | static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, |
365 | unsigned int ipl) | |
366 | { | |
367 | struct sctphdr *sctph; | |
368 | ||
1dd27cde | 369 | if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) |
c008b33f DC |
370 | return 1; |
371 | ||
372 | sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); | |
373 | if (!sctph) | |
374 | return 0; | |
375 | ||
376 | sctph->checksum = sctp_compute_cksum(skb, | |
377 | skb_network_offset(skb) + ihl); | |
378 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 379 | skb->csum_not_inet = 0; |
c008b33f DC |
380 | |
381 | return 1; | |
382 | } | |
383 | ||
eb4d4065 GB |
384 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) |
385 | { | |
d14a489a | 386 | const struct iphdr *iph; |
eb4d4065 GB |
387 | int ntkoff; |
388 | ||
389 | ntkoff = skb_network_offset(skb); | |
390 | ||
391 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
392 | goto fail; | |
393 | ||
394 | iph = ip_hdr(skb); | |
395 | ||
396 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
397 | case IPPROTO_ICMP: | |
398 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
399 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
400 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
401 | goto fail; |
402 | break; | |
403 | case IPPROTO_IGMP: | |
404 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
405 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
406 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
407 | goto fail; |
408 | break; | |
409 | case IPPROTO_TCP: | |
410 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 411 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 412 | ntohs(iph->tot_len))) |
eb4d4065 GB |
413 | goto fail; |
414 | break; | |
415 | case IPPROTO_UDP: | |
416 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 417 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 418 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
419 | goto fail; |
420 | break; | |
421 | case IPPROTO_UDPLITE: | |
422 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 423 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 424 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
425 | goto fail; |
426 | break; | |
c008b33f DC |
427 | case IPPROTO_SCTP: |
428 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
429 | !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) | |
430 | goto fail; | |
431 | break; | |
eb4d4065 GB |
432 | } |
433 | ||
434 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 435 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
436 | goto fail; |
437 | ||
d14a489a | 438 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
439 | } |
440 | ||
441 | return 1; | |
442 | ||
443 | fail: | |
444 | return 0; | |
445 | } | |
446 | ||
5a7a5555 JHS |
447 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, |
448 | unsigned int *pl) | |
eb4d4065 GB |
449 | { |
450 | int off, len, optlen; | |
451 | unsigned char *xh = (void *)ip6xh; | |
452 | ||
453 | off = sizeof(*ip6xh); | |
454 | len = ixhl - off; | |
455 | ||
456 | while (len > 1) { | |
0eec32ff | 457 | switch (xh[off]) { |
1de5a71c | 458 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
459 | optlen = 1; |
460 | break; | |
461 | case IPV6_TLV_JUMBO: | |
462 | optlen = xh[off + 1] + 2; | |
463 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
464 | /* wrong jumbo option length/alignment */ | |
465 | return 0; | |
466 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
467 | goto done; | |
468 | default: | |
469 | optlen = xh[off + 1] + 2; | |
470 | if (optlen > len) | |
471 | /* ignore obscure options */ | |
472 | goto done; | |
473 | break; | |
474 | } | |
475 | off += optlen; | |
476 | len -= optlen; | |
477 | } | |
478 | ||
479 | done: | |
480 | return 1; | |
481 | } | |
482 | ||
483 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
484 | { | |
485 | struct ipv6hdr *ip6h; | |
486 | struct ipv6_opt_hdr *ip6xh; | |
487 | unsigned int hl, ixhl; | |
488 | unsigned int pl; | |
489 | int ntkoff; | |
490 | u8 nexthdr; | |
491 | ||
492 | ntkoff = skb_network_offset(skb); | |
493 | ||
494 | hl = sizeof(*ip6h); | |
495 | ||
496 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
497 | goto fail; | |
498 | ||
499 | ip6h = ipv6_hdr(skb); | |
500 | ||
501 | pl = ntohs(ip6h->payload_len); | |
502 | nexthdr = ip6h->nexthdr; | |
503 | ||
504 | do { | |
505 | switch (nexthdr) { | |
506 | case NEXTHDR_FRAGMENT: | |
507 | goto ignore_skb; | |
508 | case NEXTHDR_ROUTING: | |
509 | case NEXTHDR_HOP: | |
510 | case NEXTHDR_DEST: | |
511 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
512 | goto fail; | |
513 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
514 | ixhl = ipv6_optlen(ip6xh); | |
515 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
516 | goto fail; | |
d14a489a | 517 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
518 | if ((nexthdr == NEXTHDR_HOP) && |
519 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
520 | goto fail; | |
521 | nexthdr = ip6xh->nexthdr; | |
522 | hl += ixhl; | |
523 | break; | |
524 | case IPPROTO_ICMPV6: | |
525 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 526 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
527 | hl, pl + sizeof(*ip6h))) |
528 | goto fail; | |
529 | goto done; | |
530 | case IPPROTO_TCP: | |
531 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 532 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
533 | hl, pl + sizeof(*ip6h))) |
534 | goto fail; | |
535 | goto done; | |
536 | case IPPROTO_UDP: | |
537 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 538 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 539 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
540 | goto fail; |
541 | goto done; | |
542 | case IPPROTO_UDPLITE: | |
543 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 544 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 545 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
546 | goto fail; |
547 | goto done; | |
c008b33f DC |
548 | case IPPROTO_SCTP: |
549 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
550 | !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) | |
551 | goto fail; | |
552 | goto done; | |
eb4d4065 GB |
553 | default: |
554 | goto ignore_skb; | |
555 | } | |
556 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
557 | ||
558 | done: | |
559 | ignore_skb: | |
560 | return 1; | |
561 | ||
562 | fail: | |
563 | return 0; | |
564 | } | |
565 | ||
c831549c JHS |
566 | static int tcf_csum_act(struct sk_buff *skb, const struct tc_action *a, |
567 | struct tcf_result *res) | |
eb4d4065 | 568 | { |
a85a970a | 569 | struct tcf_csum *p = to_tcf_csum(a); |
2ecba2d1 EB |
570 | bool orig_vlan_tag_present = false; |
571 | unsigned int vlan_hdr_count = 0; | |
9c5f69bb | 572 | struct tcf_csum_params *params; |
eb4d4065 | 573 | u32 update_flags; |
2ecba2d1 | 574 | __be16 protocol; |
9c5f69bb DC |
575 | int action; |
576 | ||
7fd4b288 | 577 | params = rcu_dereference_bh(p->params); |
eb4d4065 | 578 | |
9c4a4e48 | 579 | tcf_lastuse_update(&p->tcf_tm); |
5e1ad95b | 580 | tcf_action_update_bstats(&p->common, skb); |
eb4d4065 | 581 | |
11a245e2 | 582 | action = READ_ONCE(p->tcf_action); |
eb4d4065 | 583 | if (unlikely(action == TC_ACT_SHOT)) |
7fd4b288 | 584 | goto drop; |
eb4d4065 | 585 | |
9c5f69bb | 586 | update_flags = params->update_flags; |
d7bf2ebe | 587 | protocol = skb_protocol(skb, false); |
2ecba2d1 EB |
588 | again: |
589 | switch (protocol) { | |
eb4d4065 GB |
590 | case cpu_to_be16(ETH_P_IP): |
591 | if (!tcf_csum_ipv4(skb, update_flags)) | |
592 | goto drop; | |
593 | break; | |
594 | case cpu_to_be16(ETH_P_IPV6): | |
595 | if (!tcf_csum_ipv6(skb, update_flags)) | |
596 | goto drop; | |
597 | break; | |
964201de GS |
598 | case cpu_to_be16(ETH_P_8021AD): |
599 | fallthrough; | |
2ecba2d1 EB |
600 | case cpu_to_be16(ETH_P_8021Q): |
601 | if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) { | |
602 | protocol = skb->protocol; | |
603 | orig_vlan_tag_present = true; | |
604 | } else { | |
605 | struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data; | |
606 | ||
607 | protocol = vlan->h_vlan_encapsulated_proto; | |
608 | skb_pull(skb, VLAN_HLEN); | |
609 | skb_reset_network_header(skb); | |
610 | vlan_hdr_count++; | |
611 | } | |
612 | goto again; | |
613 | } | |
614 | ||
615 | out: | |
616 | /* Restore the skb for the pulled VLAN tags */ | |
617 | while (vlan_hdr_count--) { | |
618 | skb_push(skb, VLAN_HLEN); | |
619 | skb_reset_network_header(skb); | |
eb4d4065 GB |
620 | } |
621 | ||
622 | return action; | |
623 | ||
624 | drop: | |
26b537a8 | 625 | tcf_action_inc_drop_qstats(&p->common); |
2ecba2d1 EB |
626 | action = TC_ACT_SHOT; |
627 | goto out; | |
eb4d4065 GB |
628 | } |
629 | ||
5a7a5555 JHS |
630 | static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
631 | int ref) | |
eb4d4065 GB |
632 | { |
633 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 634 | struct tcf_csum *p = to_tcf_csum(a); |
9c5f69bb | 635 | struct tcf_csum_params *params; |
eb4d4065 | 636 | struct tc_csum opt = { |
eb4d4065 | 637 | .index = p->tcf_index, |
036bb443 VB |
638 | .refcnt = refcount_read(&p->tcf_refcnt) - ref, |
639 | .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, | |
eb4d4065 GB |
640 | }; |
641 | struct tcf_t t; | |
642 | ||
653cd284 | 643 | spin_lock_bh(&p->tcf_lock); |
b6a2b971 VB |
644 | params = rcu_dereference_protected(p->params, |
645 | lockdep_is_held(&p->tcf_lock)); | |
646 | opt.action = p->tcf_action; | |
9c5f69bb DC |
647 | opt.update_flags = params->update_flags; |
648 | ||
1b34ec43 DM |
649 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
650 | goto nla_put_failure; | |
48d8ee16 JHS |
651 | |
652 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 653 | if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) |
1b34ec43 | 654 | goto nla_put_failure; |
653cd284 | 655 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
656 | |
657 | return skb->len; | |
658 | ||
659 | nla_put_failure: | |
653cd284 | 660 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
661 | nlmsg_trim(skb, b); |
662 | return -1; | |
663 | } | |
664 | ||
9c5f69bb DC |
665 | static void tcf_csum_cleanup(struct tc_action *a) |
666 | { | |
667 | struct tcf_csum *p = to_tcf_csum(a); | |
668 | struct tcf_csum_params *params; | |
669 | ||
670 | params = rcu_dereference_protected(p->params, 1); | |
aab378a7 DC |
671 | if (params) |
672 | kfree_rcu(params, rcu); | |
9c5f69bb DC |
673 | } |
674 | ||
29e6eee1 CD |
675 | static size_t tcf_csum_get_fill_size(const struct tc_action *act) |
676 | { | |
677 | return nla_total_size(sizeof(struct tc_csum)); | |
678 | } | |
679 | ||
c54e1d92 | 680 | static int tcf_csum_offload_act_setup(struct tc_action *act, void *entry_data, |
c2ccf84e IS |
681 | u32 *index_inc, bool bind, |
682 | struct netlink_ext_ack *extack) | |
c54e1d92 BZ |
683 | { |
684 | if (bind) { | |
685 | struct flow_action_entry *entry = entry_data; | |
686 | ||
687 | entry->id = FLOW_ACTION_CSUM; | |
688 | entry->csum_flags = tcf_csum_update_flags(act); | |
689 | *index_inc = 1; | |
690 | } else { | |
8cbfe939 BZ |
691 | struct flow_offload_action *fl_action = entry_data; |
692 | ||
693 | fl_action->id = FLOW_ACTION_CSUM; | |
c54e1d92 BZ |
694 | } |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
eb4d4065 | 699 | static struct tc_action_ops act_csum_ops = { |
0eec32ff | 700 | .kind = "csum", |
eddd2cf1 | 701 | .id = TCA_ID_CSUM, |
0eec32ff | 702 | .owner = THIS_MODULE, |
c831549c | 703 | .act = tcf_csum_act, |
0eec32ff | 704 | .dump = tcf_csum_dump, |
0eec32ff | 705 | .init = tcf_csum_init, |
9c5f69bb | 706 | .cleanup = tcf_csum_cleanup, |
29e6eee1 | 707 | .get_fill_size = tcf_csum_get_fill_size, |
c54e1d92 | 708 | .offload_act_setup = tcf_csum_offload_act_setup, |
a85a970a | 709 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
710 | }; |
711 | ||
712 | static __net_init int csum_init_net(struct net *net) | |
713 | { | |
acd0a7ab | 714 | struct tc_action_net *tn = net_generic(net, act_csum_ops.net_id); |
ddf97ccd | 715 | |
981471bd | 716 | return tc_action_net_init(net, tn, &act_csum_ops); |
ddf97ccd WC |
717 | } |
718 | ||
039af9c6 | 719 | static void __net_exit csum_exit_net(struct list_head *net_list) |
ddf97ccd | 720 | { |
acd0a7ab | 721 | tc_action_net_exit(net_list, act_csum_ops.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, |
acd0a7ab | 727 | .id = &act_csum_ops.net_id, |
ddf97ccd | 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); |