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, | |
a85a970a | 44 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 45 | int bind, bool rtnl_held, 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); |
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; | |
4e8ddd7f VB |
81 | if (!ovr) { |
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 GB |
112 | |
113 | if (ret == ACT_P_CREATED) | |
65a206c0 | 114 | tcf_idr_insert(tn, *a); |
eb4d4065 GB |
115 | |
116 | return ret; | |
f5c29d83 DC |
117 | put_chain: |
118 | if (goto_ch) | |
119 | tcf_chain_put_by_act(goto_ch); | |
120 | release_idr: | |
121 | tcf_idr_release(*a, bind); | |
122 | return err; | |
eb4d4065 GB |
123 | } |
124 | ||
eb4d4065 GB |
125 | /** |
126 | * tcf_csum_skb_nextlayer - Get next layer pointer | |
127 | * @skb: sk_buff to use | |
128 | * @ihl: previous summed headers length | |
129 | * @ipl: complete packet length | |
130 | * @jhl: next header length | |
131 | * | |
132 | * Check the expected next layer availability in the specified sk_buff. | |
133 | * Return the next layer pointer if pass, NULL otherwise. | |
134 | */ | |
135 | static void *tcf_csum_skb_nextlayer(struct sk_buff *skb, | |
136 | unsigned int ihl, unsigned int ipl, | |
137 | unsigned int jhl) | |
138 | { | |
139 | int ntkoff = skb_network_offset(skb); | |
140 | int hl = ihl + jhl; | |
141 | ||
142 | if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) || | |
3697649f | 143 | skb_try_make_writable(skb, hl + ntkoff)) |
eb4d4065 GB |
144 | return NULL; |
145 | else | |
146 | return (void *)(skb_network_header(skb) + ihl); | |
147 | } | |
148 | ||
5a7a5555 JHS |
149 | static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl, |
150 | unsigned int ipl) | |
eb4d4065 GB |
151 | { |
152 | struct icmphdr *icmph; | |
153 | ||
154 | icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph)); | |
155 | if (icmph == NULL) | |
156 | return 0; | |
157 | ||
158 | icmph->checksum = 0; | |
159 | skb->csum = csum_partial(icmph, ipl - ihl, 0); | |
160 | icmph->checksum = csum_fold(skb->csum); | |
161 | ||
162 | skb->ip_summed = CHECKSUM_NONE; | |
163 | ||
164 | return 1; | |
165 | } | |
166 | ||
167 | static int tcf_csum_ipv4_igmp(struct sk_buff *skb, | |
168 | unsigned int ihl, unsigned int ipl) | |
169 | { | |
170 | struct igmphdr *igmph; | |
171 | ||
172 | igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph)); | |
173 | if (igmph == NULL) | |
174 | return 0; | |
175 | ||
176 | igmph->csum = 0; | |
177 | skb->csum = csum_partial(igmph, ipl - ihl, 0); | |
178 | igmph->csum = csum_fold(skb->csum); | |
179 | ||
180 | skb->ip_summed = CHECKSUM_NONE; | |
181 | ||
182 | return 1; | |
183 | } | |
184 | ||
5a7a5555 JHS |
185 | static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl, |
186 | unsigned int ipl) | |
eb4d4065 GB |
187 | { |
188 | struct icmp6hdr *icmp6h; | |
d14a489a | 189 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
190 | |
191 | icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h)); | |
192 | if (icmp6h == NULL) | |
193 | return 0; | |
194 | ||
d14a489a | 195 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
196 | icmp6h->icmp6_cksum = 0; |
197 | skb->csum = csum_partial(icmp6h, ipl - ihl, 0); | |
198 | icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
199 | ipl - ihl, IPPROTO_ICMPV6, | |
200 | skb->csum); | |
201 | ||
202 | skb->ip_summed = CHECKSUM_NONE; | |
203 | ||
204 | return 1; | |
205 | } | |
206 | ||
5a7a5555 JHS |
207 | static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl, |
208 | unsigned int ipl) | |
eb4d4065 GB |
209 | { |
210 | struct tcphdr *tcph; | |
d14a489a | 211 | const struct iphdr *iph; |
eb4d4065 | 212 | |
add641e7 DC |
213 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
214 | return 1; | |
215 | ||
eb4d4065 GB |
216 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
217 | if (tcph == NULL) | |
218 | return 0; | |
219 | ||
d14a489a | 220 | iph = ip_hdr(skb); |
eb4d4065 GB |
221 | tcph->check = 0; |
222 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
223 | tcph->check = tcp_v4_check(ipl - ihl, | |
224 | iph->saddr, iph->daddr, skb->csum); | |
225 | ||
226 | skb->ip_summed = CHECKSUM_NONE; | |
227 | ||
228 | return 1; | |
229 | } | |
230 | ||
5a7a5555 JHS |
231 | static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl, |
232 | unsigned int ipl) | |
eb4d4065 GB |
233 | { |
234 | struct tcphdr *tcph; | |
d14a489a | 235 | const struct ipv6hdr *ip6h; |
eb4d4065 | 236 | |
add641e7 DC |
237 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
238 | return 1; | |
239 | ||
eb4d4065 GB |
240 | tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph)); |
241 | if (tcph == NULL) | |
242 | return 0; | |
243 | ||
d14a489a | 244 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
245 | tcph->check = 0; |
246 | skb->csum = csum_partial(tcph, ipl - ihl, 0); | |
247 | tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
248 | ipl - ihl, IPPROTO_TCP, | |
249 | skb->csum); | |
250 | ||
251 | skb->ip_summed = CHECKSUM_NONE; | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
5a7a5555 JHS |
256 | static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl, |
257 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
258 | { |
259 | struct udphdr *udph; | |
d14a489a | 260 | const struct iphdr *iph; |
eb4d4065 GB |
261 | u16 ul; |
262 | ||
0c19f846 WB |
263 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
264 | return 1; | |
265 | ||
0eec32ff CG |
266 | /* |
267 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
268 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
269 | * UDPLITE uses udph->len for another thing, |
270 | * Use iph->tot_len, or just ipl. | |
271 | */ | |
272 | ||
273 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
274 | if (udph == NULL) | |
275 | return 0; | |
276 | ||
d14a489a | 277 | iph = ip_hdr(skb); |
eb4d4065 GB |
278 | ul = ntohs(udph->len); |
279 | ||
280 | if (udplite || udph->check) { | |
281 | ||
282 | udph->check = 0; | |
283 | ||
284 | if (udplite) { | |
285 | if (ul == 0) | |
286 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
eb4d4065 GB |
287 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) |
288 | skb->csum = csum_partial(udph, ul, 0); | |
eb4d4065 GB |
289 | else |
290 | goto ignore_obscure_skb; | |
291 | } else { | |
292 | if (ul != ipl - ihl) | |
293 | goto ignore_obscure_skb; | |
294 | ||
295 | skb->csum = csum_partial(udph, ul, 0); | |
296 | } | |
297 | ||
298 | udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, | |
299 | ul, iph->protocol, | |
300 | skb->csum); | |
301 | ||
302 | if (!udph->check) | |
303 | udph->check = CSUM_MANGLED_0; | |
304 | } | |
305 | ||
306 | skb->ip_summed = CHECKSUM_NONE; | |
307 | ||
308 | ignore_obscure_skb: | |
309 | return 1; | |
310 | } | |
311 | ||
5a7a5555 JHS |
312 | static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl, |
313 | unsigned int ipl, int udplite) | |
eb4d4065 GB |
314 | { |
315 | struct udphdr *udph; | |
d14a489a | 316 | const struct ipv6hdr *ip6h; |
eb4d4065 GB |
317 | u16 ul; |
318 | ||
0c19f846 WB |
319 | if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
320 | return 1; | |
321 | ||
0eec32ff CG |
322 | /* |
323 | * Support both UDP and UDPLITE checksum algorithms, Don't use | |
324 | * udph->len to get the real length without any protocol check, | |
eb4d4065 GB |
325 | * UDPLITE uses udph->len for another thing, |
326 | * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl. | |
327 | */ | |
328 | ||
329 | udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph)); | |
330 | if (udph == NULL) | |
331 | return 0; | |
332 | ||
d14a489a | 333 | ip6h = ipv6_hdr(skb); |
eb4d4065 GB |
334 | ul = ntohs(udph->len); |
335 | ||
336 | udph->check = 0; | |
337 | ||
338 | if (udplite) { | |
339 | if (ul == 0) | |
340 | skb->csum = csum_partial(udph, ipl - ihl, 0); | |
341 | ||
342 | else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl)) | |
343 | skb->csum = csum_partial(udph, ul, 0); | |
344 | ||
345 | else | |
346 | goto ignore_obscure_skb; | |
347 | } else { | |
348 | if (ul != ipl - ihl) | |
349 | goto ignore_obscure_skb; | |
350 | ||
351 | skb->csum = csum_partial(udph, ul, 0); | |
352 | } | |
353 | ||
354 | udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul, | |
355 | udplite ? IPPROTO_UDPLITE : IPPROTO_UDP, | |
356 | skb->csum); | |
357 | ||
358 | if (!udph->check) | |
359 | udph->check = CSUM_MANGLED_0; | |
360 | ||
361 | skb->ip_summed = CHECKSUM_NONE; | |
362 | ||
363 | ignore_obscure_skb: | |
364 | return 1; | |
365 | } | |
366 | ||
c008b33f DC |
367 | static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl, |
368 | unsigned int ipl) | |
369 | { | |
370 | struct sctphdr *sctph; | |
371 | ||
1dd27cde | 372 | if (skb_is_gso(skb) && skb_is_gso_sctp(skb)) |
c008b33f DC |
373 | return 1; |
374 | ||
375 | sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph)); | |
376 | if (!sctph) | |
377 | return 0; | |
378 | ||
379 | sctph->checksum = sctp_compute_cksum(skb, | |
380 | skb_network_offset(skb) + ihl); | |
381 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 382 | skb->csum_not_inet = 0; |
c008b33f DC |
383 | |
384 | return 1; | |
385 | } | |
386 | ||
eb4d4065 GB |
387 | static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags) |
388 | { | |
d14a489a | 389 | const struct iphdr *iph; |
eb4d4065 GB |
390 | int ntkoff; |
391 | ||
392 | ntkoff = skb_network_offset(skb); | |
393 | ||
394 | if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff)) | |
395 | goto fail; | |
396 | ||
397 | iph = ip_hdr(skb); | |
398 | ||
399 | switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) { | |
400 | case IPPROTO_ICMP: | |
401 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
0eec32ff CG |
402 | if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4, |
403 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
404 | goto fail; |
405 | break; | |
406 | case IPPROTO_IGMP: | |
407 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP) | |
0eec32ff CG |
408 | if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4, |
409 | ntohs(iph->tot_len))) | |
eb4d4065 GB |
410 | goto fail; |
411 | break; | |
412 | case IPPROTO_TCP: | |
413 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 414 | if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4, |
0eec32ff | 415 | ntohs(iph->tot_len))) |
eb4d4065 GB |
416 | goto fail; |
417 | break; | |
418 | case IPPROTO_UDP: | |
419 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 420 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 421 | ntohs(iph->tot_len), 0)) |
eb4d4065 GB |
422 | goto fail; |
423 | break; | |
424 | case IPPROTO_UDPLITE: | |
425 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 426 | if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4, |
0eec32ff | 427 | ntohs(iph->tot_len), 1)) |
eb4d4065 GB |
428 | goto fail; |
429 | break; | |
c008b33f DC |
430 | case IPPROTO_SCTP: |
431 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
432 | !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len))) | |
433 | goto fail; | |
434 | break; | |
eb4d4065 GB |
435 | } |
436 | ||
437 | if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
3697649f | 438 | if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff)) |
eb4d4065 GB |
439 | goto fail; |
440 | ||
d14a489a | 441 | ip_send_check(ip_hdr(skb)); |
eb4d4065 GB |
442 | } |
443 | ||
444 | return 1; | |
445 | ||
446 | fail: | |
447 | return 0; | |
448 | } | |
449 | ||
5a7a5555 JHS |
450 | static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl, |
451 | unsigned int *pl) | |
eb4d4065 GB |
452 | { |
453 | int off, len, optlen; | |
454 | unsigned char *xh = (void *)ip6xh; | |
455 | ||
456 | off = sizeof(*ip6xh); | |
457 | len = ixhl - off; | |
458 | ||
459 | while (len > 1) { | |
0eec32ff | 460 | switch (xh[off]) { |
1de5a71c | 461 | case IPV6_TLV_PAD1: |
eb4d4065 GB |
462 | optlen = 1; |
463 | break; | |
464 | case IPV6_TLV_JUMBO: | |
465 | optlen = xh[off + 1] + 2; | |
466 | if (optlen != 6 || len < 6 || (off & 3) != 2) | |
467 | /* wrong jumbo option length/alignment */ | |
468 | return 0; | |
469 | *pl = ntohl(*(__be32 *)(xh + off + 2)); | |
470 | goto done; | |
471 | default: | |
472 | optlen = xh[off + 1] + 2; | |
473 | if (optlen > len) | |
474 | /* ignore obscure options */ | |
475 | goto done; | |
476 | break; | |
477 | } | |
478 | off += optlen; | |
479 | len -= optlen; | |
480 | } | |
481 | ||
482 | done: | |
483 | return 1; | |
484 | } | |
485 | ||
486 | static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags) | |
487 | { | |
488 | struct ipv6hdr *ip6h; | |
489 | struct ipv6_opt_hdr *ip6xh; | |
490 | unsigned int hl, ixhl; | |
491 | unsigned int pl; | |
492 | int ntkoff; | |
493 | u8 nexthdr; | |
494 | ||
495 | ntkoff = skb_network_offset(skb); | |
496 | ||
497 | hl = sizeof(*ip6h); | |
498 | ||
499 | if (!pskb_may_pull(skb, hl + ntkoff)) | |
500 | goto fail; | |
501 | ||
502 | ip6h = ipv6_hdr(skb); | |
503 | ||
504 | pl = ntohs(ip6h->payload_len); | |
505 | nexthdr = ip6h->nexthdr; | |
506 | ||
507 | do { | |
508 | switch (nexthdr) { | |
509 | case NEXTHDR_FRAGMENT: | |
510 | goto ignore_skb; | |
511 | case NEXTHDR_ROUTING: | |
512 | case NEXTHDR_HOP: | |
513 | case NEXTHDR_DEST: | |
514 | if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff)) | |
515 | goto fail; | |
516 | ip6xh = (void *)(skb_network_header(skb) + hl); | |
517 | ixhl = ipv6_optlen(ip6xh); | |
518 | if (!pskb_may_pull(skb, hl + ixhl + ntkoff)) | |
519 | goto fail; | |
d14a489a | 520 | ip6xh = (void *)(skb_network_header(skb) + hl); |
eb4d4065 GB |
521 | if ((nexthdr == NEXTHDR_HOP) && |
522 | !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl))) | |
523 | goto fail; | |
524 | nexthdr = ip6xh->nexthdr; | |
525 | hl += ixhl; | |
526 | break; | |
527 | case IPPROTO_ICMPV6: | |
528 | if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP) | |
d14a489a | 529 | if (!tcf_csum_ipv6_icmp(skb, |
eb4d4065 GB |
530 | hl, pl + sizeof(*ip6h))) |
531 | goto fail; | |
532 | goto done; | |
533 | case IPPROTO_TCP: | |
534 | if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP) | |
d14a489a | 535 | if (!tcf_csum_ipv6_tcp(skb, |
eb4d4065 GB |
536 | hl, pl + sizeof(*ip6h))) |
537 | goto fail; | |
538 | goto done; | |
539 | case IPPROTO_UDP: | |
540 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP) | |
d14a489a | 541 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 542 | pl + sizeof(*ip6h), 0)) |
eb4d4065 GB |
543 | goto fail; |
544 | goto done; | |
545 | case IPPROTO_UDPLITE: | |
546 | if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE) | |
d14a489a | 547 | if (!tcf_csum_ipv6_udp(skb, hl, |
0eec32ff | 548 | pl + sizeof(*ip6h), 1)) |
eb4d4065 GB |
549 | goto fail; |
550 | goto done; | |
c008b33f DC |
551 | case IPPROTO_SCTP: |
552 | if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) && | |
553 | !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h))) | |
554 | goto fail; | |
555 | goto done; | |
eb4d4065 GB |
556 | default: |
557 | goto ignore_skb; | |
558 | } | |
559 | } while (pskb_may_pull(skb, hl + 1 + ntkoff)); | |
560 | ||
561 | done: | |
562 | ignore_skb: | |
563 | return 1; | |
564 | ||
565 | fail: | |
566 | return 0; | |
567 | } | |
568 | ||
c831549c JHS |
569 | static int tcf_csum_act(struct sk_buff *skb, const struct tc_action *a, |
570 | struct tcf_result *res) | |
eb4d4065 | 571 | { |
a85a970a | 572 | struct tcf_csum *p = to_tcf_csum(a); |
2ecba2d1 EB |
573 | bool orig_vlan_tag_present = false; |
574 | unsigned int vlan_hdr_count = 0; | |
9c5f69bb | 575 | struct tcf_csum_params *params; |
eb4d4065 | 576 | u32 update_flags; |
2ecba2d1 | 577 | __be16 protocol; |
9c5f69bb DC |
578 | int action; |
579 | ||
7fd4b288 | 580 | params = rcu_dereference_bh(p->params); |
eb4d4065 | 581 | |
9c4a4e48 | 582 | tcf_lastuse_update(&p->tcf_tm); |
5e1ad95b | 583 | tcf_action_update_bstats(&p->common, skb); |
eb4d4065 | 584 | |
11a245e2 | 585 | action = READ_ONCE(p->tcf_action); |
eb4d4065 | 586 | if (unlikely(action == TC_ACT_SHOT)) |
7fd4b288 | 587 | goto drop; |
eb4d4065 | 588 | |
9c5f69bb | 589 | update_flags = params->update_flags; |
d7bf2ebe | 590 | protocol = skb_protocol(skb, false); |
2ecba2d1 EB |
591 | again: |
592 | switch (protocol) { | |
eb4d4065 GB |
593 | case cpu_to_be16(ETH_P_IP): |
594 | if (!tcf_csum_ipv4(skb, update_flags)) | |
595 | goto drop; | |
596 | break; | |
597 | case cpu_to_be16(ETH_P_IPV6): | |
598 | if (!tcf_csum_ipv6(skb, update_flags)) | |
599 | goto drop; | |
600 | break; | |
2ecba2d1 EB |
601 | case cpu_to_be16(ETH_P_8021AD): /* fall through */ |
602 | case cpu_to_be16(ETH_P_8021Q): | |
603 | if (skb_vlan_tag_present(skb) && !orig_vlan_tag_present) { | |
604 | protocol = skb->protocol; | |
605 | orig_vlan_tag_present = true; | |
606 | } else { | |
607 | struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data; | |
608 | ||
609 | protocol = vlan->h_vlan_encapsulated_proto; | |
610 | skb_pull(skb, VLAN_HLEN); | |
611 | skb_reset_network_header(skb); | |
612 | vlan_hdr_count++; | |
613 | } | |
614 | goto again; | |
615 | } | |
616 | ||
617 | out: | |
618 | /* Restore the skb for the pulled VLAN tags */ | |
619 | while (vlan_hdr_count--) { | |
620 | skb_push(skb, VLAN_HLEN); | |
621 | skb_reset_network_header(skb); | |
eb4d4065 GB |
622 | } |
623 | ||
624 | return action; | |
625 | ||
626 | drop: | |
26b537a8 | 627 | tcf_action_inc_drop_qstats(&p->common); |
2ecba2d1 EB |
628 | action = TC_ACT_SHOT; |
629 | goto out; | |
eb4d4065 GB |
630 | } |
631 | ||
5a7a5555 JHS |
632 | static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
633 | int ref) | |
eb4d4065 GB |
634 | { |
635 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 636 | struct tcf_csum *p = to_tcf_csum(a); |
9c5f69bb | 637 | struct tcf_csum_params *params; |
eb4d4065 | 638 | struct tc_csum opt = { |
eb4d4065 | 639 | .index = p->tcf_index, |
036bb443 VB |
640 | .refcnt = refcount_read(&p->tcf_refcnt) - ref, |
641 | .bindcnt = atomic_read(&p->tcf_bindcnt) - bind, | |
eb4d4065 GB |
642 | }; |
643 | struct tcf_t t; | |
644 | ||
653cd284 | 645 | spin_lock_bh(&p->tcf_lock); |
b6a2b971 VB |
646 | params = rcu_dereference_protected(p->params, |
647 | lockdep_is_held(&p->tcf_lock)); | |
648 | opt.action = p->tcf_action; | |
9c5f69bb DC |
649 | opt.update_flags = params->update_flags; |
650 | ||
1b34ec43 DM |
651 | if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt)) |
652 | goto nla_put_failure; | |
48d8ee16 JHS |
653 | |
654 | tcf_tm_dump(&t, &p->tcf_tm); | |
9854518e | 655 | if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD)) |
1b34ec43 | 656 | goto nla_put_failure; |
653cd284 | 657 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
658 | |
659 | return skb->len; | |
660 | ||
661 | nla_put_failure: | |
653cd284 | 662 | spin_unlock_bh(&p->tcf_lock); |
eb4d4065 GB |
663 | nlmsg_trim(skb, b); |
664 | return -1; | |
665 | } | |
666 | ||
9c5f69bb DC |
667 | static void tcf_csum_cleanup(struct tc_action *a) |
668 | { | |
669 | struct tcf_csum *p = to_tcf_csum(a); | |
670 | struct tcf_csum_params *params; | |
671 | ||
672 | params = rcu_dereference_protected(p->params, 1); | |
aab378a7 DC |
673 | if (params) |
674 | kfree_rcu(params, rcu); | |
9c5f69bb DC |
675 | } |
676 | ||
ddf97ccd WC |
677 | static int tcf_csum_walker(struct net *net, struct sk_buff *skb, |
678 | struct netlink_callback *cb, int type, | |
41780105 AA |
679 | const struct tc_action_ops *ops, |
680 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
681 | { |
682 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
683 | ||
b3620145 | 684 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
685 | } |
686 | ||
f061b48c | 687 | static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
688 | { |
689 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
690 | ||
65a206c0 | 691 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
692 | } |
693 | ||
29e6eee1 CD |
694 | static size_t tcf_csum_get_fill_size(const struct tc_action *act) |
695 | { | |
696 | return nla_total_size(sizeof(struct tc_csum)); | |
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, |
ddf97ccd WC |
707 | .walk = tcf_csum_walker, |
708 | .lookup = tcf_csum_search, | |
29e6eee1 | 709 | .get_fill_size = tcf_csum_get_fill_size, |
a85a970a | 710 | .size = sizeof(struct tcf_csum), |
ddf97ccd WC |
711 | }; |
712 | ||
713 | static __net_init int csum_init_net(struct net *net) | |
714 | { | |
715 | struct tc_action_net *tn = net_generic(net, csum_net_id); | |
716 | ||
981471bd | 717 | return tc_action_net_init(net, tn, &act_csum_ops); |
ddf97ccd WC |
718 | } |
719 | ||
039af9c6 | 720 | static void __net_exit csum_exit_net(struct list_head *net_list) |
ddf97ccd | 721 | { |
039af9c6 | 722 | tc_action_net_exit(net_list, csum_net_id); |
ddf97ccd WC |
723 | } |
724 | ||
725 | static struct pernet_operations csum_net_ops = { | |
726 | .init = csum_init_net, | |
039af9c6 | 727 | .exit_batch = csum_exit_net, |
ddf97ccd WC |
728 | .id = &csum_net_id, |
729 | .size = sizeof(struct tc_action_net), | |
eb4d4065 GB |
730 | }; |
731 | ||
732 | MODULE_DESCRIPTION("Checksum updating actions"); | |
733 | MODULE_LICENSE("GPL"); | |
734 | ||
735 | static int __init csum_init_module(void) | |
736 | { | |
ddf97ccd | 737 | return tcf_register_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
738 | } |
739 | ||
740 | static void __exit csum_cleanup_module(void) | |
741 | { | |
ddf97ccd | 742 | tcf_unregister_action(&act_csum_ops, &csum_net_ops); |
eb4d4065 GB |
743 | } |
744 | ||
745 | module_init(csum_init_module); | |
746 | module_exit(csum_cleanup_module); |