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

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

Version: ~ [ linux-5.1-rc1 ] ~ [ linux-5.0.3 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.30 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.107 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.164 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.176 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.136 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ 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-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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  * net/sched/cls_flow.c         Generic flow classifier
  3  *
  4  * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version 2
  9  * of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/init.h>
 14 #include <linux/list.h>
 15 #include <linux/jhash.h>
 16 #include <linux/random.h>
 17 #include <linux/pkt_cls.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/in.h>
 20 #include <linux/ip.h>
 21 #include <linux/ipv6.h>
 22 #include <linux/if_vlan.h>
 23 #include <linux/slab.h>
 24 #include <linux/module.h>
 25 #include <net/inet_sock.h>
 26 
 27 #include <net/pkt_cls.h>
 28 #include <net/ip.h>
 29 #include <net/route.h>
 30 #include <net/flow_dissector.h>
 31 
 32 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 33 #include <net/netfilter/nf_conntrack.h>
 34 #endif
 35 
 36 struct flow_head {
 37         struct list_head        filters;
 38         struct rcu_head         rcu;
 39 };
 40 
 41 struct flow_filter {
 42         struct list_head        list;
 43         struct tcf_exts         exts;
 44         struct tcf_ematch_tree  ematches;
 45         struct tcf_proto        *tp;
 46         struct timer_list       perturb_timer;
 47         u32                     perturb_period;
 48         u32                     handle;
 49 
 50         u32                     nkeys;
 51         u32                     keymask;
 52         u32                     mode;
 53         u32                     mask;
 54         u32                     xor;
 55         u32                     rshift;
 56         u32                     addend;
 57         u32                     divisor;
 58         u32                     baseclass;
 59         u32                     hashrnd;
 60         union {
 61                 struct work_struct      work;
 62                 struct rcu_head         rcu;
 63         };
 64 };
 65 
 66 static inline u32 addr_fold(void *addr)
 67 {
 68         unsigned long a = (unsigned long)addr;
 69 
 70         return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
 71 }
 72 
 73 static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
 74 {
 75         __be32 src = flow_get_u32_src(flow);
 76 
 77         if (src)
 78                 return ntohl(src);
 79 
 80         return addr_fold(skb->sk);
 81 }
 82 
 83 static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
 84 {
 85         __be32 dst = flow_get_u32_dst(flow);
 86 
 87         if (dst)
 88                 return ntohl(dst);
 89 
 90         return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
 91 }
 92 
 93 static u32 flow_get_proto(const struct sk_buff *skb,
 94                           const struct flow_keys *flow)
 95 {
 96         return flow->basic.ip_proto;
 97 }
 98 
 99 static u32 flow_get_proto_src(const struct sk_buff *skb,
100                               const struct flow_keys *flow)
101 {
102         if (flow->ports.ports)
103                 return ntohs(flow->ports.src);
104 
105         return addr_fold(skb->sk);
106 }
107 
108 static u32 flow_get_proto_dst(const struct sk_buff *skb,
109                               const struct flow_keys *flow)
110 {
111         if (flow->ports.ports)
112                 return ntohs(flow->ports.dst);
113 
114         return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
115 }
116 
117 static u32 flow_get_iif(const struct sk_buff *skb)
118 {
119         return skb->skb_iif;
120 }
121 
122 static u32 flow_get_priority(const struct sk_buff *skb)
123 {
124         return skb->priority;
125 }
126 
127 static u32 flow_get_mark(const struct sk_buff *skb)
128 {
129         return skb->mark;
130 }
131 
132 static u32 flow_get_nfct(const struct sk_buff *skb)
133 {
134 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
135         return addr_fold(skb_nfct(skb));
136 #else
137         return 0;
138 #endif
139 }
140 
141 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
142 #define CTTUPLE(skb, member)                                            \
143 ({                                                                      \
144         enum ip_conntrack_info ctinfo;                                  \
145         const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);             \
146         if (ct == NULL)                                                 \
147                 goto fallback;                                          \
148         ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member;                 \
149 })
150 #else
151 #define CTTUPLE(skb, member)                                            \
152 ({                                                                      \
153         goto fallback;                                                  \
154         0;                                                              \
155 })
156 #endif
157 
158 static u32 flow_get_nfct_src(const struct sk_buff *skb,
159                              const struct flow_keys *flow)
160 {
161         switch (tc_skb_protocol(skb)) {
162         case htons(ETH_P_IP):
163                 return ntohl(CTTUPLE(skb, src.u3.ip));
164         case htons(ETH_P_IPV6):
165                 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
166         }
167 fallback:
168         return flow_get_src(skb, flow);
169 }
170 
171 static u32 flow_get_nfct_dst(const struct sk_buff *skb,
172                              const struct flow_keys *flow)
173 {
174         switch (tc_skb_protocol(skb)) {
175         case htons(ETH_P_IP):
176                 return ntohl(CTTUPLE(skb, dst.u3.ip));
177         case htons(ETH_P_IPV6):
178                 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
179         }
180 fallback:
181         return flow_get_dst(skb, flow);
182 }
183 
184 static u32 flow_get_nfct_proto_src(const struct sk_buff *skb,
185                                    const struct flow_keys *flow)
186 {
187         return ntohs(CTTUPLE(skb, src.u.all));
188 fallback:
189         return flow_get_proto_src(skb, flow);
190 }
191 
192 static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb,
193                                    const struct flow_keys *flow)
194 {
195         return ntohs(CTTUPLE(skb, dst.u.all));
196 fallback:
197         return flow_get_proto_dst(skb, flow);
198 }
199 
200 static u32 flow_get_rtclassid(const struct sk_buff *skb)
201 {
202 #ifdef CONFIG_IP_ROUTE_CLASSID
203         if (skb_dst(skb))
204                 return skb_dst(skb)->tclassid;
205 #endif
206         return 0;
207 }
208 
209 static u32 flow_get_skuid(const struct sk_buff *skb)
210 {
211         struct sock *sk = skb_to_full_sk(skb);
212 
213         if (sk && sk->sk_socket && sk->sk_socket->file) {
214                 kuid_t skuid = sk->sk_socket->file->f_cred->fsuid;
215 
216                 return from_kuid(&init_user_ns, skuid);
217         }
218         return 0;
219 }
220 
221 static u32 flow_get_skgid(const struct sk_buff *skb)
222 {
223         struct sock *sk = skb_to_full_sk(skb);
224 
225         if (sk && sk->sk_socket && sk->sk_socket->file) {
226                 kgid_t skgid = sk->sk_socket->file->f_cred->fsgid;
227 
228                 return from_kgid(&init_user_ns, skgid);
229         }
230         return 0;
231 }
232 
233 static u32 flow_get_vlan_tag(const struct sk_buff *skb)
234 {
235         u16 uninitialized_var(tag);
236 
237         if (vlan_get_tag(skb, &tag) < 0)
238                 return 0;
239         return tag & VLAN_VID_MASK;
240 }
241 
242 static u32 flow_get_rxhash(struct sk_buff *skb)
243 {
244         return skb_get_hash(skb);
245 }
246 
247 static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
248 {
249         switch (key) {
250         case FLOW_KEY_SRC:
251                 return flow_get_src(skb, flow);
252         case FLOW_KEY_DST:
253                 return flow_get_dst(skb, flow);
254         case FLOW_KEY_PROTO:
255                 return flow_get_proto(skb, flow);
256         case FLOW_KEY_PROTO_SRC:
257                 return flow_get_proto_src(skb, flow);
258         case FLOW_KEY_PROTO_DST:
259                 return flow_get_proto_dst(skb, flow);
260         case FLOW_KEY_IIF:
261                 return flow_get_iif(skb);
262         case FLOW_KEY_PRIORITY:
263                 return flow_get_priority(skb);
264         case FLOW_KEY_MARK:
265                 return flow_get_mark(skb);
266         case FLOW_KEY_NFCT:
267                 return flow_get_nfct(skb);
268         case FLOW_KEY_NFCT_SRC:
269                 return flow_get_nfct_src(skb, flow);
270         case FLOW_KEY_NFCT_DST:
271                 return flow_get_nfct_dst(skb, flow);
272         case FLOW_KEY_NFCT_PROTO_SRC:
273                 return flow_get_nfct_proto_src(skb, flow);
274         case FLOW_KEY_NFCT_PROTO_DST:
275                 return flow_get_nfct_proto_dst(skb, flow);
276         case FLOW_KEY_RTCLASSID:
277                 return flow_get_rtclassid(skb);
278         case FLOW_KEY_SKUID:
279                 return flow_get_skuid(skb);
280         case FLOW_KEY_SKGID:
281                 return flow_get_skgid(skb);
282         case FLOW_KEY_VLAN_TAG:
283                 return flow_get_vlan_tag(skb);
284         case FLOW_KEY_RXHASH:
285                 return flow_get_rxhash(skb);
286         default:
287                 WARN_ON(1);
288                 return 0;
289         }
290 }
291 
292 #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) |                 \
293                           (1 << FLOW_KEY_DST) |                 \
294                           (1 << FLOW_KEY_PROTO) |               \
295                           (1 << FLOW_KEY_PROTO_SRC) |           \
296                           (1 << FLOW_KEY_PROTO_DST) |           \
297                           (1 << FLOW_KEY_NFCT_SRC) |            \
298                           (1 << FLOW_KEY_NFCT_DST) |            \
299                           (1 << FLOW_KEY_NFCT_PROTO_SRC) |      \
300                           (1 << FLOW_KEY_NFCT_PROTO_DST))
301 
302 static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
303                          struct tcf_result *res)
304 {
305         struct flow_head *head = rcu_dereference_bh(tp->root);
306         struct flow_filter *f;
307         u32 keymask;
308         u32 classid;
309         unsigned int n, key;
310         int r;
311 
312         list_for_each_entry_rcu(f, &head->filters, list) {
313                 u32 keys[FLOW_KEY_MAX + 1];
314                 struct flow_keys flow_keys;
315 
316                 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
317                         continue;
318 
319                 keymask = f->keymask;
320                 if (keymask & FLOW_KEYS_NEEDED)
321                         skb_flow_dissect_flow_keys(skb, &flow_keys, 0);
322 
323                 for (n = 0; n < f->nkeys; n++) {
324                         key = ffs(keymask) - 1;
325                         keymask &= ~(1 << key);
326                         keys[n] = flow_key_get(skb, key, &flow_keys);
327                 }
328 
329                 if (f->mode == FLOW_MODE_HASH)
330                         classid = jhash2(keys, f->nkeys, f->hashrnd);
331                 else {
332                         classid = keys[0];
333                         classid = (classid & f->mask) ^ f->xor;
334                         classid = (classid >> f->rshift) + f->addend;
335                 }
336 
337                 if (f->divisor)
338                         classid %= f->divisor;
339 
340                 res->class   = 0;
341                 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
342 
343                 r = tcf_exts_exec(skb, &f->exts, res);
344                 if (r < 0)
345                         continue;
346                 return r;
347         }
348         return -1;
349 }
350 
351 static void flow_perturbation(struct timer_list *t)
352 {
353         struct flow_filter *f = from_timer(f, t, perturb_timer);
354 
355         get_random_bytes(&f->hashrnd, 4);
356         if (f->perturb_period)
357                 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
358 }
359 
360 static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
361         [TCA_FLOW_KEYS]         = { .type = NLA_U32 },
362         [TCA_FLOW_MODE]         = { .type = NLA_U32 },
363         [TCA_FLOW_BASECLASS]    = { .type = NLA_U32 },
364         [TCA_FLOW_RSHIFT]       = { .type = NLA_U32 },
365         [TCA_FLOW_ADDEND]       = { .type = NLA_U32 },
366         [TCA_FLOW_MASK]         = { .type = NLA_U32 },
367         [TCA_FLOW_XOR]          = { .type = NLA_U32 },
368         [TCA_FLOW_DIVISOR]      = { .type = NLA_U32 },
369         [TCA_FLOW_ACT]          = { .type = NLA_NESTED },
370         [TCA_FLOW_POLICE]       = { .type = NLA_NESTED },
371         [TCA_FLOW_EMATCHES]     = { .type = NLA_NESTED },
372         [TCA_FLOW_PERTURB]      = { .type = NLA_U32 },
373 };
374 
375 static void __flow_destroy_filter(struct flow_filter *f)
376 {
377         del_timer_sync(&f->perturb_timer);
378         tcf_exts_destroy(&f->exts);
379         tcf_em_tree_destroy(&f->ematches);
380         tcf_exts_put_net(&f->exts);
381         kfree(f);
382 }
383 
384 static void flow_destroy_filter_work(struct work_struct *work)
385 {
386         struct flow_filter *f = container_of(work, struct flow_filter, work);
387 
388         rtnl_lock();
389         __flow_destroy_filter(f);
390         rtnl_unlock();
391 }
392 
393 static void flow_destroy_filter(struct rcu_head *head)
394 {
395         struct flow_filter *f = container_of(head, struct flow_filter, rcu);
396 
397         INIT_WORK(&f->work, flow_destroy_filter_work);
398         tcf_queue_work(&f->work);
399 }
400 
401 static int flow_change(struct net *net, struct sk_buff *in_skb,
402                        struct tcf_proto *tp, unsigned long base,
403                        u32 handle, struct nlattr **tca,
404                        void **arg, bool ovr, struct netlink_ext_ack *extack)
405 {
406         struct flow_head *head = rtnl_dereference(tp->root);
407         struct flow_filter *fold, *fnew;
408         struct nlattr *opt = tca[TCA_OPTIONS];
409         struct nlattr *tb[TCA_FLOW_MAX + 1];
410         unsigned int nkeys = 0;
411         unsigned int perturb_period = 0;
412         u32 baseclass = 0;
413         u32 keymask = 0;
414         u32 mode;
415         int err;
416 
417         if (opt == NULL)
418                 return -EINVAL;
419 
420         err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy, NULL);
421         if (err < 0)
422                 return err;
423 
424         if (tb[TCA_FLOW_BASECLASS]) {
425                 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
426                 if (TC_H_MIN(baseclass) == 0)
427                         return -EINVAL;
428         }
429 
430         if (tb[TCA_FLOW_KEYS]) {
431                 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
432 
433                 nkeys = hweight32(keymask);
434                 if (nkeys == 0)
435                         return -EINVAL;
436 
437                 if (fls(keymask) - 1 > FLOW_KEY_MAX)
438                         return -EOPNOTSUPP;
439 
440                 if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
441                     sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
442                         return -EOPNOTSUPP;
443         }
444 
445         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
446         if (!fnew)
447                 return -ENOBUFS;
448 
449         err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches);
450         if (err < 0)
451                 goto err1;
452 
453         err = tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);
454         if (err < 0)
455                 goto err2;
456 
457         err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr,
458                                 extack);
459         if (err < 0)
460                 goto err2;
461 
462         fold = *arg;
463         if (fold) {
464                 err = -EINVAL;
465                 if (fold->handle != handle && handle)
466                         goto err2;
467 
468                 /* Copy fold into fnew */
469                 fnew->tp = fold->tp;
470                 fnew->handle = fold->handle;
471                 fnew->nkeys = fold->nkeys;
472                 fnew->keymask = fold->keymask;
473                 fnew->mode = fold->mode;
474                 fnew->mask = fold->mask;
475                 fnew->xor = fold->xor;
476                 fnew->rshift = fold->rshift;
477                 fnew->addend = fold->addend;
478                 fnew->divisor = fold->divisor;
479                 fnew->baseclass = fold->baseclass;
480                 fnew->hashrnd = fold->hashrnd;
481 
482                 mode = fold->mode;
483                 if (tb[TCA_FLOW_MODE])
484                         mode = nla_get_u32(tb[TCA_FLOW_MODE]);
485                 if (mode != FLOW_MODE_HASH && nkeys > 1)
486                         goto err2;
487 
488                 if (mode == FLOW_MODE_HASH)
489                         perturb_period = fold->perturb_period;
490                 if (tb[TCA_FLOW_PERTURB]) {
491                         if (mode != FLOW_MODE_HASH)
492                                 goto err2;
493                         perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
494                 }
495         } else {
496                 err = -EINVAL;
497                 if (!handle)
498                         goto err2;
499                 if (!tb[TCA_FLOW_KEYS])
500                         goto err2;
501 
502                 mode = FLOW_MODE_MAP;
503                 if (tb[TCA_FLOW_MODE])
504                         mode = nla_get_u32(tb[TCA_FLOW_MODE]);
505                 if (mode != FLOW_MODE_HASH && nkeys > 1)
506                         goto err2;
507 
508                 if (tb[TCA_FLOW_PERTURB]) {
509                         if (mode != FLOW_MODE_HASH)
510                                 goto err2;
511                         perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
512                 }
513 
514                 if (TC_H_MAJ(baseclass) == 0) {
515                         struct Qdisc *q = tcf_block_q(tp->chain->block);
516 
517                         baseclass = TC_H_MAKE(q->handle, baseclass);
518                 }
519                 if (TC_H_MIN(baseclass) == 0)
520                         baseclass = TC_H_MAKE(baseclass, 1);
521 
522                 fnew->handle = handle;
523                 fnew->mask  = ~0U;
524                 fnew->tp = tp;
525                 get_random_bytes(&fnew->hashrnd, 4);
526         }
527 
528         timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE);
529 
530         tcf_block_netif_keep_dst(tp->chain->block);
531 
532         if (tb[TCA_FLOW_KEYS]) {
533                 fnew->keymask = keymask;
534                 fnew->nkeys   = nkeys;
535         }
536 
537         fnew->mode = mode;
538 
539         if (tb[TCA_FLOW_MASK])
540                 fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
541         if (tb[TCA_FLOW_XOR])
542                 fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
543         if (tb[TCA_FLOW_RSHIFT])
544                 fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
545         if (tb[TCA_FLOW_ADDEND])
546                 fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
547 
548         if (tb[TCA_FLOW_DIVISOR])
549                 fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
550         if (baseclass)
551                 fnew->baseclass = baseclass;
552 
553         fnew->perturb_period = perturb_period;
554         if (perturb_period)
555                 mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
556 
557         if (!*arg)
558                 list_add_tail_rcu(&fnew->list, &head->filters);
559         else
560                 list_replace_rcu(&fold->list, &fnew->list);
561 
562         *arg = fnew;
563 
564         if (fold) {
565                 tcf_exts_get_net(&fold->exts);
566                 call_rcu(&fold->rcu, flow_destroy_filter);
567         }
568         return 0;
569 
570 err2:
571         tcf_exts_destroy(&fnew->exts);
572         tcf_em_tree_destroy(&fnew->ematches);
573 err1:
574         kfree(fnew);
575         return err;
576 }
577 
578 static int flow_delete(struct tcf_proto *tp, void *arg, bool *last,
579                        struct netlink_ext_ack *extack)
580 {
581         struct flow_head *head = rtnl_dereference(tp->root);
582         struct flow_filter *f = arg;
583 
584         list_del_rcu(&f->list);
585         tcf_exts_get_net(&f->exts);
586         call_rcu(&f->rcu, flow_destroy_filter);
587         *last = list_empty(&head->filters);
588         return 0;
589 }
590 
591 static int flow_init(struct tcf_proto *tp)
592 {
593         struct flow_head *head;
594 
595         head = kzalloc(sizeof(*head), GFP_KERNEL);
596         if (head == NULL)
597                 return -ENOBUFS;
598         INIT_LIST_HEAD(&head->filters);
599         rcu_assign_pointer(tp->root, head);
600         return 0;
601 }
602 
603 static void flow_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
604 {
605         struct flow_head *head = rtnl_dereference(tp->root);
606         struct flow_filter *f, *next;
607 
608         list_for_each_entry_safe(f, next, &head->filters, list) {
609                 list_del_rcu(&f->list);
610                 if (tcf_exts_get_net(&f->exts))
611                         call_rcu(&f->rcu, flow_destroy_filter);
612                 else
613                         __flow_destroy_filter(f);
614         }
615         kfree_rcu(head, rcu);
616 }
617 
618 static void *flow_get(struct tcf_proto *tp, u32 handle)
619 {
620         struct flow_head *head = rtnl_dereference(tp->root);
621         struct flow_filter *f;
622 
623         list_for_each_entry(f, &head->filters, list)
624                 if (f->handle == handle)
625                         return f;
626         return NULL;
627 }
628 
629 static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh,
630                      struct sk_buff *skb, struct tcmsg *t)
631 {
632         struct flow_filter *f = fh;
633         struct nlattr *nest;
634 
635         if (f == NULL)
636                 return skb->len;
637 
638         t->tcm_handle = f->handle;
639 
640         nest = nla_nest_start(skb, TCA_OPTIONS);
641         if (nest == NULL)
642                 goto nla_put_failure;
643 
644         if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
645             nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
646                 goto nla_put_failure;
647 
648         if (f->mask != ~0 || f->xor != 0) {
649                 if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
650                     nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
651                         goto nla_put_failure;
652         }
653         if (f->rshift &&
654             nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
655                 goto nla_put_failure;
656         if (f->addend &&
657             nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
658                 goto nla_put_failure;
659 
660         if (f->divisor &&
661             nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
662                 goto nla_put_failure;
663         if (f->baseclass &&
664             nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
665                 goto nla_put_failure;
666 
667         if (f->perturb_period &&
668             nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
669                 goto nla_put_failure;
670 
671         if (tcf_exts_dump(skb, &f->exts) < 0)
672                 goto nla_put_failure;
673 #ifdef CONFIG_NET_EMATCH
674         if (f->ematches.hdr.nmatches &&
675             tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
676                 goto nla_put_failure;
677 #endif
678         nla_nest_end(skb, nest);
679 
680         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
681                 goto nla_put_failure;
682 
683         return skb->len;
684 
685 nla_put_failure:
686         nla_nest_cancel(skb, nest);
687         return -1;
688 }
689 
690 static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
691 {
692         struct flow_head *head = rtnl_dereference(tp->root);
693         struct flow_filter *f;
694 
695         list_for_each_entry(f, &head->filters, list) {
696                 if (arg->count < arg->skip)
697                         goto skip;
698                 if (arg->fn(tp, f, arg) < 0) {
699                         arg->stop = 1;
700                         break;
701                 }
702 skip:
703                 arg->count++;
704         }
705 }
706 
707 static struct tcf_proto_ops cls_flow_ops __read_mostly = {
708         .kind           = "flow",
709         .classify       = flow_classify,
710         .init           = flow_init,
711         .destroy        = flow_destroy,
712         .change         = flow_change,
713         .delete         = flow_delete,
714         .get            = flow_get,
715         .dump           = flow_dump,
716         .walk           = flow_walk,
717         .owner          = THIS_MODULE,
718 };
719 
720 static int __init cls_flow_init(void)
721 {
722         return register_tcf_proto_ops(&cls_flow_ops);
723 }
724 
725 static void __exit cls_flow_exit(void)
726 {
727         unregister_tcf_proto_ops(&cls_flow_ops);
728 }
729 
730 module_init(cls_flow_init);
731 module_exit(cls_flow_exit);
732 
733 MODULE_LICENSE("GPL");
734 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
735 MODULE_DESCRIPTION("TC flow classifier");
736 

~ [ 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