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TOMOYO Linux Cross Reference
Linux/net/sched/act_csum.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Checksum updating actions
  3  *
  4  * Copyright (c) 2010 Gregoire Baron <baronchon@n7mm.org>
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the Free
  8  * Software Foundation; either version 2 of the License, or (at your option)
  9  * any later version.
 10  *
 11  */
 12 
 13 #include <linux/types.h>
 14 #include <linux/init.h>
 15 #include <linux/kernel.h>
 16 #include <linux/module.h>
 17 #include <linux/spinlock.h>
 18 
 19 #include <linux/netlink.h>
 20 #include <net/netlink.h>
 21 #include <linux/rtnetlink.h>
 22 
 23 #include <linux/skbuff.h>
 24 
 25 #include <net/ip.h>
 26 #include <net/ipv6.h>
 27 #include <net/icmp.h>
 28 #include <linux/icmpv6.h>
 29 #include <linux/igmp.h>
 30 #include <net/tcp.h>
 31 #include <net/udp.h>
 32 #include <net/ip6_checksum.h>
 33 
 34 #include <net/act_api.h>
 35 
 36 #include <linux/tc_act/tc_csum.h>
 37 #include <net/tc_act/tc_csum.h>
 38 
 39 #define CSUM_TAB_MASK 15
 40 static struct tcf_common *tcf_csum_ht[CSUM_TAB_MASK + 1];
 41 static u32 csum_idx_gen;
 42 static DEFINE_RWLOCK(csum_lock);
 43 
 44 static struct tcf_hashinfo csum_hash_info = {
 45         .htab   = tcf_csum_ht,
 46         .hmask  = CSUM_TAB_MASK,
 47         .lock   = &csum_lock,
 48 };
 49 
 50 static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
 51         [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
 52 };
 53 
 54 static int tcf_csum_init(struct net *n, struct nlattr *nla, struct nlattr *est,
 55                          struct tc_action *a, int ovr, int bind)
 56 {
 57         struct nlattr *tb[TCA_CSUM_MAX + 1];
 58         struct tc_csum *parm;
 59         struct tcf_common *pc;
 60         struct tcf_csum *p;
 61         int ret = 0, err;
 62 
 63         if (nla == NULL)
 64                 return -EINVAL;
 65 
 66         err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy);
 67         if (err < 0)
 68                 return err;
 69 
 70         if (tb[TCA_CSUM_PARMS] == NULL)
 71                 return -EINVAL;
 72         parm = nla_data(tb[TCA_CSUM_PARMS]);
 73 
 74         pc = tcf_hash_check(parm->index, a, bind, &csum_hash_info);
 75         if (!pc) {
 76                 pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind,
 77                                      &csum_idx_gen, &csum_hash_info);
 78                 if (IS_ERR(pc))
 79                         return PTR_ERR(pc);
 80                 p = to_tcf_csum(pc);
 81                 ret = ACT_P_CREATED;
 82         } else {
 83                 p = to_tcf_csum(pc);
 84                 if (!ovr) {
 85                         tcf_hash_release(pc, bind, &csum_hash_info);
 86                         return -EEXIST;
 87                 }
 88         }
 89 
 90         spin_lock_bh(&p->tcf_lock);
 91         p->tcf_action = parm->action;
 92         p->update_flags = parm->update_flags;
 93         spin_unlock_bh(&p->tcf_lock);
 94 
 95         if (ret == ACT_P_CREATED)
 96                 tcf_hash_insert(pc, &csum_hash_info);
 97 
 98         return ret;
 99 }
100 
101 static int tcf_csum_cleanup(struct tc_action *a, int bind)
102 {
103         struct tcf_csum *p = a->priv;
104         return tcf_hash_release(&p->common, bind, &csum_hash_info);
105 }
106 
107 /**
108  * tcf_csum_skb_nextlayer - Get next layer pointer
109  * @skb: sk_buff to use
110  * @ihl: previous summed headers length
111  * @ipl: complete packet length
112  * @jhl: next header length
113  *
114  * Check the expected next layer availability in the specified sk_buff.
115  * Return the next layer pointer if pass, NULL otherwise.
116  */
117 static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
118                                     unsigned int ihl, unsigned int ipl,
119                                     unsigned int jhl)
120 {
121         int ntkoff = skb_network_offset(skb);
122         int hl = ihl + jhl;
123 
124         if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
125             (skb_cloned(skb) &&
126              !skb_clone_writable(skb, hl + ntkoff) &&
127              pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
128                 return NULL;
129         else
130                 return (void *)(skb_network_header(skb) + ihl);
131 }
132 
133 static int tcf_csum_ipv4_icmp(struct sk_buff *skb,
134                               unsigned int ihl, unsigned int ipl)
135 {
136         struct icmphdr *icmph;
137 
138         icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
139         if (icmph == NULL)
140                 return 0;
141 
142         icmph->checksum = 0;
143         skb->csum = csum_partial(icmph, ipl - ihl, 0);
144         icmph->checksum = csum_fold(skb->csum);
145 
146         skb->ip_summed = CHECKSUM_NONE;
147 
148         return 1;
149 }
150 
151 static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
152                               unsigned int ihl, unsigned int ipl)
153 {
154         struct igmphdr *igmph;
155 
156         igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
157         if (igmph == NULL)
158                 return 0;
159 
160         igmph->csum = 0;
161         skb->csum = csum_partial(igmph, ipl - ihl, 0);
162         igmph->csum = csum_fold(skb->csum);
163 
164         skb->ip_summed = CHECKSUM_NONE;
165 
166         return 1;
167 }
168 
169 static int tcf_csum_ipv6_icmp(struct sk_buff *skb,
170                               unsigned int ihl, unsigned int ipl)
171 {
172         struct icmp6hdr *icmp6h;
173         const struct ipv6hdr *ip6h;
174 
175         icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
176         if (icmp6h == NULL)
177                 return 0;
178 
179         ip6h = ipv6_hdr(skb);
180         icmp6h->icmp6_cksum = 0;
181         skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
182         icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
183                                               ipl - ihl, IPPROTO_ICMPV6,
184                                               skb->csum);
185 
186         skb->ip_summed = CHECKSUM_NONE;
187 
188         return 1;
189 }
190 
191 static int tcf_csum_ipv4_tcp(struct sk_buff *skb,
192                              unsigned int ihl, unsigned int ipl)
193 {
194         struct tcphdr *tcph;
195         const struct iphdr *iph;
196 
197         tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
198         if (tcph == NULL)
199                 return 0;
200 
201         iph = ip_hdr(skb);
202         tcph->check = 0;
203         skb->csum = csum_partial(tcph, ipl - ihl, 0);
204         tcph->check = tcp_v4_check(ipl - ihl,
205                                    iph->saddr, iph->daddr, skb->csum);
206 
207         skb->ip_summed = CHECKSUM_NONE;
208 
209         return 1;
210 }
211 
212 static int tcf_csum_ipv6_tcp(struct sk_buff *skb,
213                              unsigned int ihl, unsigned int ipl)
214 {
215         struct tcphdr *tcph;
216         const struct ipv6hdr *ip6h;
217 
218         tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
219         if (tcph == NULL)
220                 return 0;
221 
222         ip6h = ipv6_hdr(skb);
223         tcph->check = 0;
224         skb->csum = csum_partial(tcph, ipl - ihl, 0);
225         tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
226                                       ipl - ihl, IPPROTO_TCP,
227                                       skb->csum);
228 
229         skb->ip_summed = CHECKSUM_NONE;
230 
231         return 1;
232 }
233 
234 static int tcf_csum_ipv4_udp(struct sk_buff *skb,
235                              unsigned int ihl, unsigned int ipl, int udplite)
236 {
237         struct udphdr *udph;
238         const struct iphdr *iph;
239         u16 ul;
240 
241         /*
242          * Support both UDP and UDPLITE checksum algorithms, Don't use
243          * udph->len to get the real length without any protocol check,
244          * UDPLITE uses udph->len for another thing,
245          * Use iph->tot_len, or just ipl.
246          */
247 
248         udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
249         if (udph == NULL)
250                 return 0;
251 
252         iph = ip_hdr(skb);
253         ul = ntohs(udph->len);
254 
255         if (udplite || udph->check) {
256 
257                 udph->check = 0;
258 
259                 if (udplite) {
260                         if (ul == 0)
261                                 skb->csum = csum_partial(udph, ipl - ihl, 0);
262                         else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
263                                 skb->csum = csum_partial(udph, ul, 0);
264                         else
265                                 goto ignore_obscure_skb;
266                 } else {
267                         if (ul != ipl - ihl)
268                                 goto ignore_obscure_skb;
269 
270                         skb->csum = csum_partial(udph, ul, 0);
271                 }
272 
273                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
274                                                 ul, iph->protocol,
275                                                 skb->csum);
276 
277                 if (!udph->check)
278                         udph->check = CSUM_MANGLED_0;
279         }
280 
281         skb->ip_summed = CHECKSUM_NONE;
282 
283 ignore_obscure_skb:
284         return 1;
285 }
286 
287 static int tcf_csum_ipv6_udp(struct sk_buff *skb,
288                              unsigned int ihl, unsigned int ipl, int udplite)
289 {
290         struct udphdr *udph;
291         const struct ipv6hdr *ip6h;
292         u16 ul;
293 
294         /*
295          * Support both UDP and UDPLITE checksum algorithms, Don't use
296          * udph->len to get the real length without any protocol check,
297          * UDPLITE uses udph->len for another thing,
298          * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
299          */
300 
301         udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
302         if (udph == NULL)
303                 return 0;
304 
305         ip6h = ipv6_hdr(skb);
306         ul = ntohs(udph->len);
307 
308         udph->check = 0;
309 
310         if (udplite) {
311                 if (ul == 0)
312                         skb->csum = csum_partial(udph, ipl - ihl, 0);
313 
314                 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
315                         skb->csum = csum_partial(udph, ul, 0);
316 
317                 else
318                         goto ignore_obscure_skb;
319         } else {
320                 if (ul != ipl - ihl)
321                         goto ignore_obscure_skb;
322 
323                 skb->csum = csum_partial(udph, ul, 0);
324         }
325 
326         udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
327                                       udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
328                                       skb->csum);
329 
330         if (!udph->check)
331                 udph->check = CSUM_MANGLED_0;
332 
333         skb->ip_summed = CHECKSUM_NONE;
334 
335 ignore_obscure_skb:
336         return 1;
337 }
338 
339 static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
340 {
341         const struct iphdr *iph;
342         int ntkoff;
343 
344         ntkoff = skb_network_offset(skb);
345 
346         if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
347                 goto fail;
348 
349         iph = ip_hdr(skb);
350 
351         switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
352         case IPPROTO_ICMP:
353                 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
354                         if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
355                                                 ntohs(iph->tot_len)))
356                                 goto fail;
357                 break;
358         case IPPROTO_IGMP:
359                 if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
360                         if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
361                                                 ntohs(iph->tot_len)))
362                                 goto fail;
363                 break;
364         case IPPROTO_TCP:
365                 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
366                         if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
367                                                ntohs(iph->tot_len)))
368                                 goto fail;
369                 break;
370         case IPPROTO_UDP:
371                 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
372                         if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
373                                                ntohs(iph->tot_len), 0))
374                                 goto fail;
375                 break;
376         case IPPROTO_UDPLITE:
377                 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
378                         if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
379                                                ntohs(iph->tot_len), 1))
380                                 goto fail;
381                 break;
382         }
383 
384         if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
385                 if (skb_cloned(skb) &&
386                     !skb_clone_writable(skb, sizeof(*iph) + ntkoff) &&
387                     pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
388                         goto fail;
389 
390                 ip_send_check(ip_hdr(skb));
391         }
392 
393         return 1;
394 
395 fail:
396         return 0;
397 }
398 
399 static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh,
400                                  unsigned int ixhl, unsigned int *pl)
401 {
402         int off, len, optlen;
403         unsigned char *xh = (void *)ip6xh;
404 
405         off = sizeof(*ip6xh);
406         len = ixhl - off;
407 
408         while (len > 1) {
409                 switch (xh[off]) {
410                 case IPV6_TLV_PAD1:
411                         optlen = 1;
412                         break;
413                 case IPV6_TLV_JUMBO:
414                         optlen = xh[off + 1] + 2;
415                         if (optlen != 6 || len < 6 || (off & 3) != 2)
416                                 /* wrong jumbo option length/alignment */
417                                 return 0;
418                         *pl = ntohl(*(__be32 *)(xh + off + 2));
419                         goto done;
420                 default:
421                         optlen = xh[off + 1] + 2;
422                         if (optlen > len)
423                                 /* ignore obscure options */
424                                 goto done;
425                         break;
426                 }
427                 off += optlen;
428                 len -= optlen;
429         }
430 
431 done:
432         return 1;
433 }
434 
435 static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
436 {
437         struct ipv6hdr *ip6h;
438         struct ipv6_opt_hdr *ip6xh;
439         unsigned int hl, ixhl;
440         unsigned int pl;
441         int ntkoff;
442         u8 nexthdr;
443 
444         ntkoff = skb_network_offset(skb);
445 
446         hl = sizeof(*ip6h);
447 
448         if (!pskb_may_pull(skb, hl + ntkoff))
449                 goto fail;
450 
451         ip6h = ipv6_hdr(skb);
452 
453         pl = ntohs(ip6h->payload_len);
454         nexthdr = ip6h->nexthdr;
455 
456         do {
457                 switch (nexthdr) {
458                 case NEXTHDR_FRAGMENT:
459                         goto ignore_skb;
460                 case NEXTHDR_ROUTING:
461                 case NEXTHDR_HOP:
462                 case NEXTHDR_DEST:
463                         if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
464                                 goto fail;
465                         ip6xh = (void *)(skb_network_header(skb) + hl);
466                         ixhl = ipv6_optlen(ip6xh);
467                         if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
468                                 goto fail;
469                         ip6xh = (void *)(skb_network_header(skb) + hl);
470                         if ((nexthdr == NEXTHDR_HOP) &&
471                             !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
472                                 goto fail;
473                         nexthdr = ip6xh->nexthdr;
474                         hl += ixhl;
475                         break;
476                 case IPPROTO_ICMPV6:
477                         if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
478                                 if (!tcf_csum_ipv6_icmp(skb,
479                                                         hl, pl + sizeof(*ip6h)))
480                                         goto fail;
481                         goto done;
482                 case IPPROTO_TCP:
483                         if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
484                                 if (!tcf_csum_ipv6_tcp(skb,
485                                                        hl, pl + sizeof(*ip6h)))
486                                         goto fail;
487                         goto done;
488                 case IPPROTO_UDP:
489                         if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
490                                 if (!tcf_csum_ipv6_udp(skb, hl,
491                                                        pl + sizeof(*ip6h), 0))
492                                         goto fail;
493                         goto done;
494                 case IPPROTO_UDPLITE:
495                         if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
496                                 if (!tcf_csum_ipv6_udp(skb, hl,
497                                                        pl + sizeof(*ip6h), 1))
498                                         goto fail;
499                         goto done;
500                 default:
501                         goto ignore_skb;
502                 }
503         } while (pskb_may_pull(skb, hl + 1 + ntkoff));
504 
505 done:
506 ignore_skb:
507         return 1;
508 
509 fail:
510         return 0;
511 }
512 
513 static int tcf_csum(struct sk_buff *skb,
514                     const struct tc_action *a, struct tcf_result *res)
515 {
516         struct tcf_csum *p = a->priv;
517         int action;
518         u32 update_flags;
519 
520         spin_lock(&p->tcf_lock);
521         p->tcf_tm.lastuse = jiffies;
522         bstats_update(&p->tcf_bstats, skb);
523         action = p->tcf_action;
524         update_flags = p->update_flags;
525         spin_unlock(&p->tcf_lock);
526 
527         if (unlikely(action == TC_ACT_SHOT))
528                 goto drop;
529 
530         switch (skb->protocol) {
531         case cpu_to_be16(ETH_P_IP):
532                 if (!tcf_csum_ipv4(skb, update_flags))
533                         goto drop;
534                 break;
535         case cpu_to_be16(ETH_P_IPV6):
536                 if (!tcf_csum_ipv6(skb, update_flags))
537                         goto drop;
538                 break;
539         }
540 
541         return action;
542 
543 drop:
544         spin_lock(&p->tcf_lock);
545         p->tcf_qstats.drops++;
546         spin_unlock(&p->tcf_lock);
547         return TC_ACT_SHOT;
548 }
549 
550 static int tcf_csum_dump(struct sk_buff *skb,
551                          struct tc_action *a, int bind, int ref)
552 {
553         unsigned char *b = skb_tail_pointer(skb);
554         struct tcf_csum *p = a->priv;
555         struct tc_csum opt = {
556                 .update_flags = p->update_flags,
557                 .index   = p->tcf_index,
558                 .action  = p->tcf_action,
559                 .refcnt  = p->tcf_refcnt - ref,
560                 .bindcnt = p->tcf_bindcnt - bind,
561         };
562         struct tcf_t t;
563 
564         if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
565                 goto nla_put_failure;
566         t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
567         t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
568         t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
569         if (nla_put(skb, TCA_CSUM_TM, sizeof(t), &t))
570                 goto nla_put_failure;
571 
572         return skb->len;
573 
574 nla_put_failure:
575         nlmsg_trim(skb, b);
576         return -1;
577 }
578 
579 static struct tc_action_ops act_csum_ops = {
580         .kind           = "csum",
581         .hinfo          = &csum_hash_info,
582         .type           = TCA_ACT_CSUM,
583         .capab          = TCA_CAP_NONE,
584         .owner          = THIS_MODULE,
585         .act            = tcf_csum,
586         .dump           = tcf_csum_dump,
587         .cleanup        = tcf_csum_cleanup,
588         .lookup         = tcf_hash_search,
589         .init           = tcf_csum_init,
590         .walk           = tcf_generic_walker
591 };
592 
593 MODULE_DESCRIPTION("Checksum updating actions");
594 MODULE_LICENSE("GPL");
595 
596 static int __init csum_init_module(void)
597 {
598         return tcf_register_action(&act_csum_ops);
599 }
600 
601 static void __exit csum_cleanup_module(void)
602 {
603         tcf_unregister_action(&act_csum_ops);
604 }
605 
606 module_init(csum_init_module);
607 module_exit(csum_cleanup_module);
608 

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