~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ 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-3.16.85 ] ~ [ 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-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 #include <net/sctp/checksum.h>
 34 
 35 #include <net/act_api.h>
 36 
 37 #include <linux/tc_act/tc_csum.h>
 38 #include <net/tc_act/tc_csum.h>
 39 
 40 #define CSUM_TAB_MASK 15
 41 
 42 static const struct nla_policy csum_policy[TCA_CSUM_MAX + 1] = {
 43         [TCA_CSUM_PARMS] = { .len = sizeof(struct tc_csum), },
 44 };
 45 
 46 static unsigned int csum_net_id;
 47 static struct tc_action_ops act_csum_ops;
 48 
 49 static int tcf_csum_init(struct net *net, struct nlattr *nla,
 50                          struct nlattr *est, struct tc_action **a, int ovr,
 51                          int bind)
 52 {
 53         struct tc_action_net *tn = net_generic(net, csum_net_id);
 54         struct nlattr *tb[TCA_CSUM_MAX + 1];
 55         struct tc_csum *parm;
 56         struct tcf_csum *p;
 57         int ret = 0, err;
 58 
 59         if (nla == NULL)
 60                 return -EINVAL;
 61 
 62         err = nla_parse_nested(tb, TCA_CSUM_MAX, nla, csum_policy, NULL);
 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]);
 69 
 70         if (!tcf_hash_check(tn, parm->index, a, bind)) {
 71                 ret = tcf_hash_create(tn, parm->index, est, a,
 72                                       &act_csum_ops, bind, false);
 73                 if (ret)
 74                         return ret;
 75                 ret = ACT_P_CREATED;
 76         } else {
 77                 if (bind)/* dont override defaults */
 78                         return 0;
 79                 tcf_hash_release(*a, bind);
 80                 if (!ovr)
 81                         return -EEXIST;
 82         }
 83 
 84         p = to_tcf_csum(*a);
 85         spin_lock_bh(&p->tcf_lock);
 86         p->tcf_action = parm->action;
 87         p->update_flags = parm->update_flags;
 88         spin_unlock_bh(&p->tcf_lock);
 89 
 90         if (ret == ACT_P_CREATED)
 91                 tcf_hash_insert(tn, *a);
 92 
 93         return ret;
 94 }
 95 
 96 /**
 97  * tcf_csum_skb_nextlayer - Get next layer pointer
 98  * @skb: sk_buff to use
 99  * @ihl: previous summed headers length
100  * @ipl: complete packet length
101  * @jhl: next header length
102  *
103  * Check the expected next layer availability in the specified sk_buff.
104  * Return the next layer pointer if pass, NULL otherwise.
105  */
106 static void *tcf_csum_skb_nextlayer(struct sk_buff *skb,
107                                     unsigned int ihl, unsigned int ipl,
108                                     unsigned int jhl)
109 {
110         int ntkoff = skb_network_offset(skb);
111         int hl = ihl + jhl;
112 
113         if (!pskb_may_pull(skb, ipl + ntkoff) || (ipl < hl) ||
114             skb_try_make_writable(skb, hl + ntkoff))
115                 return NULL;
116         else
117                 return (void *)(skb_network_header(skb) + ihl);
118 }
119 
120 static int tcf_csum_ipv4_icmp(struct sk_buff *skb, unsigned int ihl,
121                               unsigned int ipl)
122 {
123         struct icmphdr *icmph;
124 
125         icmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmph));
126         if (icmph == NULL)
127                 return 0;
128 
129         icmph->checksum = 0;
130         skb->csum = csum_partial(icmph, ipl - ihl, 0);
131         icmph->checksum = csum_fold(skb->csum);
132 
133         skb->ip_summed = CHECKSUM_NONE;
134 
135         return 1;
136 }
137 
138 static int tcf_csum_ipv4_igmp(struct sk_buff *skb,
139                               unsigned int ihl, unsigned int ipl)
140 {
141         struct igmphdr *igmph;
142 
143         igmph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*igmph));
144         if (igmph == NULL)
145                 return 0;
146 
147         igmph->csum = 0;
148         skb->csum = csum_partial(igmph, ipl - ihl, 0);
149         igmph->csum = csum_fold(skb->csum);
150 
151         skb->ip_summed = CHECKSUM_NONE;
152 
153         return 1;
154 }
155 
156 static int tcf_csum_ipv6_icmp(struct sk_buff *skb, unsigned int ihl,
157                               unsigned int ipl)
158 {
159         struct icmp6hdr *icmp6h;
160         const struct ipv6hdr *ip6h;
161 
162         icmp6h = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*icmp6h));
163         if (icmp6h == NULL)
164                 return 0;
165 
166         ip6h = ipv6_hdr(skb);
167         icmp6h->icmp6_cksum = 0;
168         skb->csum = csum_partial(icmp6h, ipl - ihl, 0);
169         icmp6h->icmp6_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
170                                               ipl - ihl, IPPROTO_ICMPV6,
171                                               skb->csum);
172 
173         skb->ip_summed = CHECKSUM_NONE;
174 
175         return 1;
176 }
177 
178 static int tcf_csum_ipv4_tcp(struct sk_buff *skb, unsigned int ihl,
179                              unsigned int ipl)
180 {
181         struct tcphdr *tcph;
182         const struct iphdr *iph;
183 
184         if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
185                 return 1;
186 
187         tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
188         if (tcph == NULL)
189                 return 0;
190 
191         iph = ip_hdr(skb);
192         tcph->check = 0;
193         skb->csum = csum_partial(tcph, ipl - ihl, 0);
194         tcph->check = tcp_v4_check(ipl - ihl,
195                                    iph->saddr, iph->daddr, skb->csum);
196 
197         skb->ip_summed = CHECKSUM_NONE;
198 
199         return 1;
200 }
201 
202 static int tcf_csum_ipv6_tcp(struct sk_buff *skb, unsigned int ihl,
203                              unsigned int ipl)
204 {
205         struct tcphdr *tcph;
206         const struct ipv6hdr *ip6h;
207 
208         if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
209                 return 1;
210 
211         tcph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*tcph));
212         if (tcph == NULL)
213                 return 0;
214 
215         ip6h = ipv6_hdr(skb);
216         tcph->check = 0;
217         skb->csum = csum_partial(tcph, ipl - ihl, 0);
218         tcph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
219                                       ipl - ihl, IPPROTO_TCP,
220                                       skb->csum);
221 
222         skb->ip_summed = CHECKSUM_NONE;
223 
224         return 1;
225 }
226 
227 static int tcf_csum_ipv4_udp(struct sk_buff *skb, unsigned int ihl,
228                              unsigned int ipl, int udplite)
229 {
230         struct udphdr *udph;
231         const struct iphdr *iph;
232         u16 ul;
233 
234         if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
235                 return 1;
236 
237         /*
238          * Support both UDP and UDPLITE checksum algorithms, Don't use
239          * udph->len to get the real length without any protocol check,
240          * UDPLITE uses udph->len for another thing,
241          * Use iph->tot_len, or just ipl.
242          */
243 
244         udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
245         if (udph == NULL)
246                 return 0;
247 
248         iph = ip_hdr(skb);
249         ul = ntohs(udph->len);
250 
251         if (udplite || udph->check) {
252 
253                 udph->check = 0;
254 
255                 if (udplite) {
256                         if (ul == 0)
257                                 skb->csum = csum_partial(udph, ipl - ihl, 0);
258                         else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
259                                 skb->csum = csum_partial(udph, ul, 0);
260                         else
261                                 goto ignore_obscure_skb;
262                 } else {
263                         if (ul != ipl - ihl)
264                                 goto ignore_obscure_skb;
265 
266                         skb->csum = csum_partial(udph, ul, 0);
267                 }
268 
269                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
270                                                 ul, iph->protocol,
271                                                 skb->csum);
272 
273                 if (!udph->check)
274                         udph->check = CSUM_MANGLED_0;
275         }
276 
277         skb->ip_summed = CHECKSUM_NONE;
278 
279 ignore_obscure_skb:
280         return 1;
281 }
282 
283 static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
284                              unsigned int ipl, int udplite)
285 {
286         struct udphdr *udph;
287         const struct ipv6hdr *ip6h;
288         u16 ul;
289 
290         if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
291                 return 1;
292 
293         /*
294          * Support both UDP and UDPLITE checksum algorithms, Don't use
295          * udph->len to get the real length without any protocol check,
296          * UDPLITE uses udph->len for another thing,
297          * Use ip6h->payload_len + sizeof(*ip6h) ... , or just ipl.
298          */
299 
300         udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
301         if (udph == NULL)
302                 return 0;
303 
304         ip6h = ipv6_hdr(skb);
305         ul = ntohs(udph->len);
306 
307         udph->check = 0;
308 
309         if (udplite) {
310                 if (ul == 0)
311                         skb->csum = csum_partial(udph, ipl - ihl, 0);
312 
313                 else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
314                         skb->csum = csum_partial(udph, ul, 0);
315 
316                 else
317                         goto ignore_obscure_skb;
318         } else {
319                 if (ul != ipl - ihl)
320                         goto ignore_obscure_skb;
321 
322                 skb->csum = csum_partial(udph, ul, 0);
323         }
324 
325         udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
326                                       udplite ? IPPROTO_UDPLITE : IPPROTO_UDP,
327                                       skb->csum);
328 
329         if (!udph->check)
330                 udph->check = CSUM_MANGLED_0;
331 
332         skb->ip_summed = CHECKSUM_NONE;
333 
334 ignore_obscure_skb:
335         return 1;
336 }
337 
338 static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
339                          unsigned int ipl)
340 {
341         struct sctphdr *sctph;
342 
343         if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_SCTP)
344                 return 1;
345 
346         sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
347         if (!sctph)
348                 return 0;
349 
350         sctph->checksum = sctp_compute_cksum(skb,
351                                              skb_network_offset(skb) + ihl);
352         skb->ip_summed = CHECKSUM_NONE;
353         skb->csum_not_inet = 0;
354 
355         return 1;
356 }
357 
358 static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
359 {
360         const struct iphdr *iph;
361         int ntkoff;
362 
363         ntkoff = skb_network_offset(skb);
364 
365         if (!pskb_may_pull(skb, sizeof(*iph) + ntkoff))
366                 goto fail;
367 
368         iph = ip_hdr(skb);
369 
370         switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
371         case IPPROTO_ICMP:
372                 if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
373                         if (!tcf_csum_ipv4_icmp(skb, iph->ihl * 4,
374                                                 ntohs(iph->tot_len)))
375                                 goto fail;
376                 break;
377         case IPPROTO_IGMP:
378                 if (update_flags & TCA_CSUM_UPDATE_FLAG_IGMP)
379                         if (!tcf_csum_ipv4_igmp(skb, iph->ihl * 4,
380                                                 ntohs(iph->tot_len)))
381                                 goto fail;
382                 break;
383         case IPPROTO_TCP:
384                 if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
385                         if (!tcf_csum_ipv4_tcp(skb, iph->ihl * 4,
386                                                ntohs(iph->tot_len)))
387                                 goto fail;
388                 break;
389         case IPPROTO_UDP:
390                 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
391                         if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
392                                                ntohs(iph->tot_len), 0))
393                                 goto fail;
394                 break;
395         case IPPROTO_UDPLITE:
396                 if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
397                         if (!tcf_csum_ipv4_udp(skb, iph->ihl * 4,
398                                                ntohs(iph->tot_len), 1))
399                                 goto fail;
400                 break;
401         case IPPROTO_SCTP:
402                 if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
403                     !tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
404                         goto fail;
405                 break;
406         }
407 
408         if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
409                 if (skb_try_make_writable(skb, sizeof(*iph) + ntkoff))
410                         goto fail;
411 
412                 ip_send_check(ip_hdr(skb));
413         }
414 
415         return 1;
416 
417 fail:
418         return 0;
419 }
420 
421 static int tcf_csum_ipv6_hopopts(struct ipv6_opt_hdr *ip6xh, unsigned int ixhl,
422                                  unsigned int *pl)
423 {
424         int off, len, optlen;
425         unsigned char *xh = (void *)ip6xh;
426 
427         off = sizeof(*ip6xh);
428         len = ixhl - off;
429 
430         while (len > 1) {
431                 switch (xh[off]) {
432                 case IPV6_TLV_PAD1:
433                         optlen = 1;
434                         break;
435                 case IPV6_TLV_JUMBO:
436                         optlen = xh[off + 1] + 2;
437                         if (optlen != 6 || len < 6 || (off & 3) != 2)
438                                 /* wrong jumbo option length/alignment */
439                                 return 0;
440                         *pl = ntohl(*(__be32 *)(xh + off + 2));
441                         goto done;
442                 default:
443                         optlen = xh[off + 1] + 2;
444                         if (optlen > len)
445                                 /* ignore obscure options */
446                                 goto done;
447                         break;
448                 }
449                 off += optlen;
450                 len -= optlen;
451         }
452 
453 done:
454         return 1;
455 }
456 
457 static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
458 {
459         struct ipv6hdr *ip6h;
460         struct ipv6_opt_hdr *ip6xh;
461         unsigned int hl, ixhl;
462         unsigned int pl;
463         int ntkoff;
464         u8 nexthdr;
465 
466         ntkoff = skb_network_offset(skb);
467 
468         hl = sizeof(*ip6h);
469 
470         if (!pskb_may_pull(skb, hl + ntkoff))
471                 goto fail;
472 
473         ip6h = ipv6_hdr(skb);
474 
475         pl = ntohs(ip6h->payload_len);
476         nexthdr = ip6h->nexthdr;
477 
478         do {
479                 switch (nexthdr) {
480                 case NEXTHDR_FRAGMENT:
481                         goto ignore_skb;
482                 case NEXTHDR_ROUTING:
483                 case NEXTHDR_HOP:
484                 case NEXTHDR_DEST:
485                         if (!pskb_may_pull(skb, hl + sizeof(*ip6xh) + ntkoff))
486                                 goto fail;
487                         ip6xh = (void *)(skb_network_header(skb) + hl);
488                         ixhl = ipv6_optlen(ip6xh);
489                         if (!pskb_may_pull(skb, hl + ixhl + ntkoff))
490                                 goto fail;
491                         ip6xh = (void *)(skb_network_header(skb) + hl);
492                         if ((nexthdr == NEXTHDR_HOP) &&
493                             !(tcf_csum_ipv6_hopopts(ip6xh, ixhl, &pl)))
494                                 goto fail;
495                         nexthdr = ip6xh->nexthdr;
496                         hl += ixhl;
497                         break;
498                 case IPPROTO_ICMPV6:
499                         if (update_flags & TCA_CSUM_UPDATE_FLAG_ICMP)
500                                 if (!tcf_csum_ipv6_icmp(skb,
501                                                         hl, pl + sizeof(*ip6h)))
502                                         goto fail;
503                         goto done;
504                 case IPPROTO_TCP:
505                         if (update_flags & TCA_CSUM_UPDATE_FLAG_TCP)
506                                 if (!tcf_csum_ipv6_tcp(skb,
507                                                        hl, pl + sizeof(*ip6h)))
508                                         goto fail;
509                         goto done;
510                 case IPPROTO_UDP:
511                         if (update_flags & TCA_CSUM_UPDATE_FLAG_UDP)
512                                 if (!tcf_csum_ipv6_udp(skb, hl,
513                                                        pl + sizeof(*ip6h), 0))
514                                         goto fail;
515                         goto done;
516                 case IPPROTO_UDPLITE:
517                         if (update_flags & TCA_CSUM_UPDATE_FLAG_UDPLITE)
518                                 if (!tcf_csum_ipv6_udp(skb, hl,
519                                                        pl + sizeof(*ip6h), 1))
520                                         goto fail;
521                         goto done;
522                 case IPPROTO_SCTP:
523                         if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
524                             !tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
525                                 goto fail;
526                         goto done;
527                 default:
528                         goto ignore_skb;
529                 }
530         } while (pskb_may_pull(skb, hl + 1 + ntkoff));
531 
532 done:
533 ignore_skb:
534         return 1;
535 
536 fail:
537         return 0;
538 }
539 
540 static int tcf_csum(struct sk_buff *skb, const struct tc_action *a,
541                     struct tcf_result *res)
542 {
543         struct tcf_csum *p = to_tcf_csum(a);
544         int action;
545         u32 update_flags;
546 
547         spin_lock(&p->tcf_lock);
548         tcf_lastuse_update(&p->tcf_tm);
549         bstats_update(&p->tcf_bstats, skb);
550         action = p->tcf_action;
551         update_flags = p->update_flags;
552         spin_unlock(&p->tcf_lock);
553 
554         if (unlikely(action == TC_ACT_SHOT))
555                 goto drop;
556 
557         switch (tc_skb_protocol(skb)) {
558         case cpu_to_be16(ETH_P_IP):
559                 if (!tcf_csum_ipv4(skb, update_flags))
560                         goto drop;
561                 break;
562         case cpu_to_be16(ETH_P_IPV6):
563                 if (!tcf_csum_ipv6(skb, update_flags))
564                         goto drop;
565                 break;
566         }
567 
568         return action;
569 
570 drop:
571         spin_lock(&p->tcf_lock);
572         p->tcf_qstats.drops++;
573         spin_unlock(&p->tcf_lock);
574         return TC_ACT_SHOT;
575 }
576 
577 static int tcf_csum_dump(struct sk_buff *skb, struct tc_action *a, int bind,
578                          int ref)
579 {
580         unsigned char *b = skb_tail_pointer(skb);
581         struct tcf_csum *p = to_tcf_csum(a);
582         struct tc_csum opt = {
583                 .update_flags = p->update_flags,
584                 .index   = p->tcf_index,
585                 .action  = p->tcf_action,
586                 .refcnt  = p->tcf_refcnt - ref,
587                 .bindcnt = p->tcf_bindcnt - bind,
588         };
589         struct tcf_t t;
590 
591         if (nla_put(skb, TCA_CSUM_PARMS, sizeof(opt), &opt))
592                 goto nla_put_failure;
593 
594         tcf_tm_dump(&t, &p->tcf_tm);
595         if (nla_put_64bit(skb, TCA_CSUM_TM, sizeof(t), &t, TCA_CSUM_PAD))
596                 goto nla_put_failure;
597 
598         return skb->len;
599 
600 nla_put_failure:
601         nlmsg_trim(skb, b);
602         return -1;
603 }
604 
605 static int tcf_csum_walker(struct net *net, struct sk_buff *skb,
606                            struct netlink_callback *cb, int type,
607                            const struct tc_action_ops *ops)
608 {
609         struct tc_action_net *tn = net_generic(net, csum_net_id);
610 
611         return tcf_generic_walker(tn, skb, cb, type, ops);
612 }
613 
614 static int tcf_csum_search(struct net *net, struct tc_action **a, u32 index)
615 {
616         struct tc_action_net *tn = net_generic(net, csum_net_id);
617 
618         return tcf_hash_search(tn, a, index);
619 }
620 
621 static struct tc_action_ops act_csum_ops = {
622         .kind           = "csum",
623         .type           = TCA_ACT_CSUM,
624         .owner          = THIS_MODULE,
625         .act            = tcf_csum,
626         .dump           = tcf_csum_dump,
627         .init           = tcf_csum_init,
628         .walk           = tcf_csum_walker,
629         .lookup         = tcf_csum_search,
630         .size           = sizeof(struct tcf_csum),
631 };
632 
633 static __net_init int csum_init_net(struct net *net)
634 {
635         struct tc_action_net *tn = net_generic(net, csum_net_id);
636 
637         return tc_action_net_init(tn, &act_csum_ops, CSUM_TAB_MASK);
638 }
639 
640 static void __net_exit csum_exit_net(struct net *net)
641 {
642         struct tc_action_net *tn = net_generic(net, csum_net_id);
643 
644         tc_action_net_exit(tn);
645 }
646 
647 static struct pernet_operations csum_net_ops = {
648         .init = csum_init_net,
649         .exit = csum_exit_net,
650         .id   = &csum_net_id,
651         .size = sizeof(struct tc_action_net),
652 };
653 
654 MODULE_DESCRIPTION("Checksum updating actions");
655 MODULE_LICENSE("GPL");
656 
657 static int __init csum_init_module(void)
658 {
659         return tcf_register_action(&act_csum_ops, &csum_net_ops);
660 }
661 
662 static void __exit csum_cleanup_module(void)
663 {
664         tcf_unregister_action(&act_csum_ops, &csum_net_ops);
665 }
666 
667 module_init(csum_init_module);
668 module_exit(csum_cleanup_module);
669 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp