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

TOMOYO Linux Cross Reference
Linux/net/sched/cls_u32.c

Version: ~ [ linux-5.13-rc7 ] ~ [ linux-5.12.12 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.45 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.127 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.195 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.237 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.273 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.273 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ 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  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 10  *
 11  *      The filters are packed to hash tables of key nodes
 12  *      with a set of 32bit key/mask pairs at every node.
 13  *      Nodes reference next level hash tables etc.
 14  *
 15  *      This scheme is the best universal classifier I managed to
 16  *      invent; it is not super-fast, but it is not slow (provided you
 17  *      program it correctly), and general enough.  And its relative
 18  *      speed grows as the number of rules becomes larger.
 19  *
 20  *      It seems that it represents the best middle point between
 21  *      speed and manageability both by human and by machine.
 22  *
 23  *      It is especially useful for link sharing combined with QoS;
 24  *      pure RSVP doesn't need such a general approach and can use
 25  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
 26  *
 27  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
 28  *      eventually when the meta match extension is made available
 29  *
 30  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
 31  */
 32 
 33 #include <linux/module.h>
 34 #include <linux/slab.h>
 35 #include <linux/types.h>
 36 #include <linux/kernel.h>
 37 #include <linux/string.h>
 38 #include <linux/errno.h>
 39 #include <linux/rtnetlink.h>
 40 #include <linux/skbuff.h>
 41 #include <net/netlink.h>
 42 #include <net/act_api.h>
 43 #include <net/pkt_cls.h>
 44 
 45 struct tc_u_knode {
 46         struct tc_u_knode       *next;
 47         u32                     handle;
 48         struct tc_u_hnode       *ht_up;
 49         struct tcf_exts         exts;
 50 #ifdef CONFIG_NET_CLS_IND
 51         int                     ifindex;
 52 #endif
 53         u8                      fshift;
 54         struct tcf_result       res;
 55         struct tc_u_hnode       *ht_down;
 56 #ifdef CONFIG_CLS_U32_PERF
 57         struct tc_u32_pcnt      *pf;
 58 #endif
 59 #ifdef CONFIG_CLS_U32_MARK
 60         struct tc_u32_mark      mark;
 61 #endif
 62         struct tc_u32_sel       sel;
 63 };
 64 
 65 struct tc_u_hnode {
 66         struct tc_u_hnode       *next;
 67         u32                     handle;
 68         u32                     prio;
 69         struct tc_u_common      *tp_c;
 70         int                     refcnt;
 71         unsigned int            divisor;
 72         struct tc_u_knode       *ht[1];
 73 };
 74 
 75 struct tc_u_common {
 76         struct tc_u_hnode       *hlist;
 77         struct Qdisc            *q;
 78         int                     refcnt;
 79         u32                     hgenerator;
 80 };
 81 
 82 static inline unsigned int u32_hash_fold(__be32 key,
 83                                          const struct tc_u32_sel *sel,
 84                                          u8 fshift)
 85 {
 86         unsigned int h = ntohl(key & sel->hmask) >> fshift;
 87 
 88         return h;
 89 }
 90 
 91 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
 92 {
 93         struct {
 94                 struct tc_u_knode *knode;
 95                 unsigned int      off;
 96         } stack[TC_U32_MAXDEPTH];
 97 
 98         struct tc_u_hnode *ht = tp->root;
 99         unsigned int off = skb_network_offset(skb);
100         struct tc_u_knode *n;
101         int sdepth = 0;
102         int off2 = 0;
103         int sel = 0;
104 #ifdef CONFIG_CLS_U32_PERF
105         int j;
106 #endif
107         int i, r;
108 
109 next_ht:
110         n = ht->ht[sel];
111 
112 next_knode:
113         if (n) {
114                 struct tc_u32_key *key = n->sel.keys;
115 
116 #ifdef CONFIG_CLS_U32_PERF
117                 n->pf->rcnt += 1;
118                 j = 0;
119 #endif
120 
121 #ifdef CONFIG_CLS_U32_MARK
122                 if ((skb->mark & n->mark.mask) != n->mark.val) {
123                         n = n->next;
124                         goto next_knode;
125                 } else {
126                         n->mark.success++;
127                 }
128 #endif
129 
130                 for (i = n->sel.nkeys; i > 0; i--, key++) {
131                         int toff = off + key->off + (off2 & key->offmask);
132                         __be32 *data, hdata;
133 
134                         if (skb_headroom(skb) + toff > INT_MAX)
135                                 goto out;
136 
137                         data = skb_header_pointer(skb, toff, 4, &hdata);
138                         if (!data)
139                                 goto out;
140                         if ((*data ^ key->val) & key->mask) {
141                                 n = n->next;
142                                 goto next_knode;
143                         }
144 #ifdef CONFIG_CLS_U32_PERF
145                         n->pf->kcnts[j] += 1;
146                         j++;
147 #endif
148                 }
149                 if (n->ht_down == NULL) {
150 check_terminal:
151                         if (n->sel.flags & TC_U32_TERMINAL) {
152 
153                                 *res = n->res;
154 #ifdef CONFIG_NET_CLS_IND
155                                 if (!tcf_match_indev(skb, n->ifindex)) {
156                                         n = n->next;
157                                         goto next_knode;
158                                 }
159 #endif
160 #ifdef CONFIG_CLS_U32_PERF
161                                 n->pf->rhit += 1;
162 #endif
163                                 r = tcf_exts_exec(skb, &n->exts, res);
164                                 if (r < 0) {
165                                         n = n->next;
166                                         goto next_knode;
167                                 }
168 
169                                 return r;
170                         }
171                         n = n->next;
172                         goto next_knode;
173                 }
174 
175                 /* PUSH */
176                 if (sdepth >= TC_U32_MAXDEPTH)
177                         goto deadloop;
178                 stack[sdepth].knode = n;
179                 stack[sdepth].off = off;
180                 sdepth++;
181 
182                 ht = n->ht_down;
183                 sel = 0;
184                 if (ht->divisor) {
185                         __be32 *data, hdata;
186 
187                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
188                                                   &hdata);
189                         if (!data)
190                                 goto out;
191                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
192                                                           n->fshift);
193                 }
194                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
195                         goto next_ht;
196 
197                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
198                         off2 = n->sel.off + 3;
199                         if (n->sel.flags & TC_U32_VAROFFSET) {
200                                 __be16 *data, hdata;
201 
202                                 data = skb_header_pointer(skb,
203                                                           off + n->sel.offoff,
204                                                           2, &hdata);
205                                 if (!data)
206                                         goto out;
207                                 off2 += ntohs(n->sel.offmask & *data) >>
208                                         n->sel.offshift;
209                         }
210                         off2 &= ~3;
211                 }
212                 if (n->sel.flags & TC_U32_EAT) {
213                         off += off2;
214                         off2 = 0;
215                 }
216 
217                 if (off < skb->len)
218                         goto next_ht;
219         }
220 
221         /* POP */
222         if (sdepth--) {
223                 n = stack[sdepth].knode;
224                 ht = n->ht_up;
225                 off = stack[sdepth].off;
226                 goto check_terminal;
227         }
228 out:
229         return -1;
230 
231 deadloop:
232         net_warn_ratelimited("cls_u32: dead loop\n");
233         return -1;
234 }
235 
236 static struct tc_u_hnode *
237 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
238 {
239         struct tc_u_hnode *ht;
240 
241         for (ht = tp_c->hlist; ht; ht = ht->next)
242                 if (ht->handle == handle)
243                         break;
244 
245         return ht;
246 }
247 
248 static struct tc_u_knode *
249 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
250 {
251         unsigned int sel;
252         struct tc_u_knode *n = NULL;
253 
254         sel = TC_U32_HASH(handle);
255         if (sel > ht->divisor)
256                 goto out;
257 
258         for (n = ht->ht[sel]; n; n = n->next)
259                 if (n->handle == handle)
260                         break;
261 out:
262         return n;
263 }
264 
265 
266 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
267 {
268         struct tc_u_hnode *ht;
269         struct tc_u_common *tp_c = tp->data;
270 
271         if (TC_U32_HTID(handle) == TC_U32_ROOT)
272                 ht = tp->root;
273         else
274                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
275 
276         if (!ht)
277                 return 0;
278 
279         if (TC_U32_KEY(handle) == 0)
280                 return (unsigned long)ht;
281 
282         return (unsigned long)u32_lookup_key(ht, handle);
283 }
284 
285 static void u32_put(struct tcf_proto *tp, unsigned long f)
286 {
287 }
288 
289 static u32 gen_new_htid(struct tc_u_common *tp_c)
290 {
291         int i = 0x800;
292 
293         do {
294                 if (++tp_c->hgenerator == 0x7FF)
295                         tp_c->hgenerator = 1;
296         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
297 
298         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
299 }
300 
301 static int u32_init(struct tcf_proto *tp)
302 {
303         struct tc_u_hnode *root_ht;
304         struct tc_u_common *tp_c;
305 
306         tp_c = tp->q->u32_node;
307 
308         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
309         if (root_ht == NULL)
310                 return -ENOBUFS;
311 
312         root_ht->divisor = 0;
313         root_ht->refcnt++;
314         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
315         root_ht->prio = tp->prio;
316 
317         if (tp_c == NULL) {
318                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
319                 if (tp_c == NULL) {
320                         kfree(root_ht);
321                         return -ENOBUFS;
322                 }
323                 tp_c->q = tp->q;
324                 tp->q->u32_node = tp_c;
325         }
326 
327         tp_c->refcnt++;
328         root_ht->next = tp_c->hlist;
329         tp_c->hlist = root_ht;
330         root_ht->tp_c = tp_c;
331 
332         tp->root = root_ht;
333         tp->data = tp_c;
334         return 0;
335 }
336 
337 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
338 {
339         tcf_unbind_filter(tp, &n->res);
340         tcf_exts_destroy(tp, &n->exts);
341         if (n->ht_down)
342                 n->ht_down->refcnt--;
343 #ifdef CONFIG_CLS_U32_PERF
344         kfree(n->pf);
345 #endif
346         kfree(n);
347         return 0;
348 }
349 
350 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
351 {
352         struct tc_u_knode **kp;
353         struct tc_u_hnode *ht = key->ht_up;
354 
355         if (ht) {
356                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
357                         if (*kp == key) {
358                                 tcf_tree_lock(tp);
359                                 *kp = key->next;
360                                 tcf_tree_unlock(tp);
361 
362                                 u32_destroy_key(tp, key);
363                                 return 0;
364                         }
365                 }
366         }
367         WARN_ON(1);
368         return 0;
369 }
370 
371 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
372 {
373         struct tc_u_knode *n;
374         unsigned int h;
375 
376         for (h = 0; h <= ht->divisor; h++) {
377                 while ((n = ht->ht[h]) != NULL) {
378                         ht->ht[h] = n->next;
379 
380                         u32_destroy_key(tp, n);
381                 }
382         }
383 }
384 
385 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
386 {
387         struct tc_u_common *tp_c = tp->data;
388         struct tc_u_hnode **hn;
389 
390         WARN_ON(ht->refcnt);
391 
392         u32_clear_hnode(tp, ht);
393 
394         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
395                 if (*hn == ht) {
396                         *hn = ht->next;
397                         kfree(ht);
398                         return 0;
399                 }
400         }
401 
402         WARN_ON(1);
403         return -ENOENT;
404 }
405 
406 static void u32_destroy(struct tcf_proto *tp)
407 {
408         struct tc_u_common *tp_c = tp->data;
409         struct tc_u_hnode *root_ht = tp->root;
410 
411         WARN_ON(root_ht == NULL);
412 
413         if (root_ht && --root_ht->refcnt == 0)
414                 u32_destroy_hnode(tp, root_ht);
415 
416         if (--tp_c->refcnt == 0) {
417                 struct tc_u_hnode *ht;
418 
419                 tp->q->u32_node = NULL;
420 
421                 for (ht = tp_c->hlist; ht; ht = ht->next) {
422                         ht->refcnt--;
423                         u32_clear_hnode(tp, ht);
424                 }
425 
426                 while ((ht = tp_c->hlist) != NULL) {
427                         tp_c->hlist = ht->next;
428 
429                         WARN_ON(ht->refcnt != 0);
430 
431                         kfree(ht);
432                 }
433 
434                 kfree(tp_c);
435         }
436 
437         tp->data = NULL;
438 }
439 
440 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
441 {
442         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
443 
444         if (ht == NULL)
445                 return 0;
446 
447         if (TC_U32_KEY(ht->handle))
448                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
449 
450         if (tp->root == ht)
451                 return -EINVAL;
452 
453         if (ht->refcnt == 1) {
454                 ht->refcnt--;
455                 u32_destroy_hnode(tp, ht);
456         } else {
457                 return -EBUSY;
458         }
459 
460         return 0;
461 }
462 
463 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
464 {
465         struct tc_u_knode *n;
466         unsigned int i = 0x7FF;
467 
468         for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
469                 if (i < TC_U32_NODE(n->handle))
470                         i = TC_U32_NODE(n->handle);
471         i++;
472 
473         return handle | (i > 0xFFF ? 0xFFF : i);
474 }
475 
476 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
477         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
478         [TCA_U32_HASH]          = { .type = NLA_U32 },
479         [TCA_U32_LINK]          = { .type = NLA_U32 },
480         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
481         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
482         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
483         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
484 };
485 
486 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
487                          unsigned long base, struct tc_u_hnode *ht,
488                          struct tc_u_knode *n, struct nlattr **tb,
489                          struct nlattr *est)
490 {
491         int err;
492         struct tcf_exts e;
493 
494         tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
495         err = tcf_exts_validate(net, tp, tb, est, &e);
496         if (err < 0)
497                 return err;
498 
499         err = -EINVAL;
500         if (tb[TCA_U32_LINK]) {
501                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
502                 struct tc_u_hnode *ht_down = NULL, *ht_old;
503 
504                 if (TC_U32_KEY(handle))
505                         goto errout;
506 
507                 if (handle) {
508                         ht_down = u32_lookup_ht(ht->tp_c, handle);
509 
510                         if (ht_down == NULL)
511                                 goto errout;
512                         ht_down->refcnt++;
513                 }
514 
515                 tcf_tree_lock(tp);
516                 ht_old = n->ht_down;
517                 n->ht_down = ht_down;
518                 tcf_tree_unlock(tp);
519 
520                 if (ht_old)
521                         ht_old->refcnt--;
522         }
523         if (tb[TCA_U32_CLASSID]) {
524                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
525                 tcf_bind_filter(tp, &n->res, base);
526         }
527 
528 #ifdef CONFIG_NET_CLS_IND
529         if (tb[TCA_U32_INDEV]) {
530                 int ret;
531                 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
532                 if (ret < 0)
533                         goto errout;
534                 n->ifindex = ret;
535         }
536 #endif
537         tcf_exts_change(tp, &n->exts, &e);
538 
539         return 0;
540 errout:
541         tcf_exts_destroy(tp, &e);
542         return err;
543 }
544 
545 static int u32_change(struct net *net, struct sk_buff *in_skb,
546                       struct tcf_proto *tp, unsigned long base, u32 handle,
547                       struct nlattr **tca,
548                       unsigned long *arg)
549 {
550         struct tc_u_common *tp_c = tp->data;
551         struct tc_u_hnode *ht;
552         struct tc_u_knode *n;
553         struct tc_u32_sel *s;
554         struct nlattr *opt = tca[TCA_OPTIONS];
555         struct nlattr *tb[TCA_U32_MAX + 1];
556         u32 htid;
557         int err;
558 
559         if (opt == NULL)
560                 return handle ? -EINVAL : 0;
561 
562         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
563         if (err < 0)
564                 return err;
565 
566         n = (struct tc_u_knode *)*arg;
567         if (n) {
568                 if (TC_U32_KEY(n->handle) == 0)
569                         return -EINVAL;
570 
571                 return u32_set_parms(net, tp, base, n->ht_up, n, tb,
572                                      tca[TCA_RATE]);
573         }
574 
575         if (tb[TCA_U32_DIVISOR]) {
576                 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
577 
578                 if (--divisor > 0x100)
579                         return -EINVAL;
580                 if (TC_U32_KEY(handle))
581                         return -EINVAL;
582                 if (handle == 0) {
583                         handle = gen_new_htid(tp->data);
584                         if (handle == 0)
585                                 return -ENOMEM;
586                 }
587                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
588                 if (ht == NULL)
589                         return -ENOBUFS;
590                 ht->tp_c = tp_c;
591                 ht->refcnt = 1;
592                 ht->divisor = divisor;
593                 ht->handle = handle;
594                 ht->prio = tp->prio;
595                 ht->next = tp_c->hlist;
596                 tp_c->hlist = ht;
597                 *arg = (unsigned long)ht;
598                 return 0;
599         }
600 
601         if (tb[TCA_U32_HASH]) {
602                 htid = nla_get_u32(tb[TCA_U32_HASH]);
603                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
604                         ht = tp->root;
605                         htid = ht->handle;
606                 } else {
607                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
608                         if (ht == NULL)
609                                 return -EINVAL;
610                 }
611         } else {
612                 ht = tp->root;
613                 htid = ht->handle;
614         }
615 
616         if (ht->divisor < TC_U32_HASH(htid))
617                 return -EINVAL;
618 
619         if (handle) {
620                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
621                         return -EINVAL;
622                 handle = htid | TC_U32_NODE(handle);
623         } else
624                 handle = gen_new_kid(ht, htid);
625 
626         if (tb[TCA_U32_SEL] == NULL)
627                 return -EINVAL;
628 
629         s = nla_data(tb[TCA_U32_SEL]);
630 
631         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
632         if (n == NULL)
633                 return -ENOBUFS;
634 
635 #ifdef CONFIG_CLS_U32_PERF
636         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
637         if (n->pf == NULL) {
638                 kfree(n);
639                 return -ENOBUFS;
640         }
641 #endif
642 
643         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
644         n->ht_up = ht;
645         n->handle = handle;
646         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
647         tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
648 
649 #ifdef CONFIG_CLS_U32_MARK
650         if (tb[TCA_U32_MARK]) {
651                 struct tc_u32_mark *mark;
652 
653                 mark = nla_data(tb[TCA_U32_MARK]);
654                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
655                 n->mark.success = 0;
656         }
657 #endif
658 
659         err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE]);
660         if (err == 0) {
661                 struct tc_u_knode **ins;
662                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
663                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
664                                 break;
665 
666                 n->next = *ins;
667                 tcf_tree_lock(tp);
668                 *ins = n;
669                 tcf_tree_unlock(tp);
670 
671                 *arg = (unsigned long)n;
672                 return 0;
673         }
674 #ifdef CONFIG_CLS_U32_PERF
675         kfree(n->pf);
676 #endif
677         kfree(n);
678         return err;
679 }
680 
681 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
682 {
683         struct tc_u_common *tp_c = tp->data;
684         struct tc_u_hnode *ht;
685         struct tc_u_knode *n;
686         unsigned int h;
687 
688         if (arg->stop)
689                 return;
690 
691         for (ht = tp_c->hlist; ht; ht = ht->next) {
692                 if (ht->prio != tp->prio)
693                         continue;
694                 if (arg->count >= arg->skip) {
695                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
696                                 arg->stop = 1;
697                                 return;
698                         }
699                 }
700                 arg->count++;
701                 for (h = 0; h <= ht->divisor; h++) {
702                         for (n = ht->ht[h]; n; n = n->next) {
703                                 if (arg->count < arg->skip) {
704                                         arg->count++;
705                                         continue;
706                                 }
707                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
708                                         arg->stop = 1;
709                                         return;
710                                 }
711                                 arg->count++;
712                         }
713                 }
714         }
715 }
716 
717 static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
718                      struct sk_buff *skb, struct tcmsg *t)
719 {
720         struct tc_u_knode *n = (struct tc_u_knode *)fh;
721         struct nlattr *nest;
722 
723         if (n == NULL)
724                 return skb->len;
725 
726         t->tcm_handle = n->handle;
727 
728         nest = nla_nest_start(skb, TCA_OPTIONS);
729         if (nest == NULL)
730                 goto nla_put_failure;
731 
732         if (TC_U32_KEY(n->handle) == 0) {
733                 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
734                 u32 divisor = ht->divisor + 1;
735 
736                 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
737                         goto nla_put_failure;
738         } else {
739                 if (nla_put(skb, TCA_U32_SEL,
740                             sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
741                             &n->sel))
742                         goto nla_put_failure;
743                 if (n->ht_up) {
744                         u32 htid = n->handle & 0xFFFFF000;
745                         if (nla_put_u32(skb, TCA_U32_HASH, htid))
746                                 goto nla_put_failure;
747                 }
748                 if (n->res.classid &&
749                     nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
750                         goto nla_put_failure;
751                 if (n->ht_down &&
752                     nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
753                         goto nla_put_failure;
754 
755 #ifdef CONFIG_CLS_U32_MARK
756                 if ((n->mark.val || n->mark.mask) &&
757                     nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
758                         goto nla_put_failure;
759 #endif
760 
761                 if (tcf_exts_dump(skb, &n->exts) < 0)
762                         goto nla_put_failure;
763 
764 #ifdef CONFIG_NET_CLS_IND
765                 if (n->ifindex) {
766                         struct net_device *dev;
767                         dev = __dev_get_by_index(net, n->ifindex);
768                         if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
769                                 goto nla_put_failure;
770                 }
771 #endif
772 #ifdef CONFIG_CLS_U32_PERF
773                 if (nla_put(skb, TCA_U32_PCNT,
774                             sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
775                             n->pf))
776                         goto nla_put_failure;
777 #endif
778         }
779 
780         nla_nest_end(skb, nest);
781 
782         if (TC_U32_KEY(n->handle))
783                 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
784                         goto nla_put_failure;
785         return skb->len;
786 
787 nla_put_failure:
788         nla_nest_cancel(skb, nest);
789         return -1;
790 }
791 
792 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
793         .kind           =       "u32",
794         .classify       =       u32_classify,
795         .init           =       u32_init,
796         .destroy        =       u32_destroy,
797         .get            =       u32_get,
798         .put            =       u32_put,
799         .change         =       u32_change,
800         .delete         =       u32_delete,
801         .walk           =       u32_walk,
802         .dump           =       u32_dump,
803         .owner          =       THIS_MODULE,
804 };
805 
806 static int __init init_u32(void)
807 {
808         pr_info("u32 classifier\n");
809 #ifdef CONFIG_CLS_U32_PERF
810         pr_info("    Performance counters on\n");
811 #endif
812 #ifdef CONFIG_NET_CLS_IND
813         pr_info("    input device check on\n");
814 #endif
815 #ifdef CONFIG_NET_CLS_ACT
816         pr_info("    Actions configured\n");
817 #endif
818         return register_tcf_proto_ops(&cls_u32_ops);
819 }
820 
821 static void __exit exit_u32(void)
822 {
823         unregister_tcf_proto_ops(&cls_u32_ops);
824 }
825 
826 module_init(init_u32)
827 module_exit(exit_u32)
828 MODULE_LICENSE("GPL");
829 

~ [ 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