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Linux/net/sched/act_pedit.c

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  1 /*
  2  * net/sched/act_pedit.c        Generic packet editor
  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:     Jamal Hadi Salim (2002-4)
 10  */
 11 
 12 #include <linux/types.h>
 13 #include <linux/kernel.h>
 14 #include <linux/string.h>
 15 #include <linux/errno.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/module.h>
 19 #include <linux/init.h>
 20 #include <linux/slab.h>
 21 #include <net/netlink.h>
 22 #include <net/pkt_sched.h>
 23 #include <linux/tc_act/tc_pedit.h>
 24 #include <net/tc_act/tc_pedit.h>
 25 #include <uapi/linux/tc_act/tc_pedit.h>
 26 #include <net/pkt_cls.h>
 27 
 28 static unsigned int pedit_net_id;
 29 static struct tc_action_ops act_pedit_ops;
 30 
 31 static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
 32         [TCA_PEDIT_PARMS]       = { .len = sizeof(struct tc_pedit) },
 33         [TCA_PEDIT_KEYS_EX]   = { .type = NLA_NESTED },
 34 };
 35 
 36 static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
 37         [TCA_PEDIT_KEY_EX_HTYPE]  = { .type = NLA_U16 },
 38         [TCA_PEDIT_KEY_EX_CMD]    = { .type = NLA_U16 },
 39 };
 40 
 41 static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
 42                                                         u8 n)
 43 {
 44         struct tcf_pedit_key_ex *keys_ex;
 45         struct tcf_pedit_key_ex *k;
 46         const struct nlattr *ka;
 47         int err = -EINVAL;
 48         int rem;
 49 
 50         if (!nla || !n)
 51                 return NULL;
 52 
 53         keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
 54         if (!keys_ex)
 55                 return ERR_PTR(-ENOMEM);
 56 
 57         k = keys_ex;
 58 
 59         nla_for_each_nested(ka, nla, rem) {
 60                 struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
 61 
 62                 if (!n) {
 63                         err = -EINVAL;
 64                         goto err_out;
 65                 }
 66                 n--;
 67 
 68                 if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
 69                         err = -EINVAL;
 70                         goto err_out;
 71                 }
 72 
 73                 err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
 74                                        pedit_key_ex_policy, NULL);
 75                 if (err)
 76                         goto err_out;
 77 
 78                 if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
 79                     !tb[TCA_PEDIT_KEY_EX_CMD]) {
 80                         err = -EINVAL;
 81                         goto err_out;
 82                 }
 83 
 84                 k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
 85                 k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
 86 
 87                 if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
 88                     k->cmd > TCA_PEDIT_CMD_MAX) {
 89                         err = -EINVAL;
 90                         goto err_out;
 91                 }
 92 
 93                 k++;
 94         }
 95 
 96         if (n) {
 97                 err = -EINVAL;
 98                 goto err_out;
 99         }
100 
101         return keys_ex;
102 
103 err_out:
104         kfree(keys_ex);
105         return ERR_PTR(err);
106 }
107 
108 static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
109                                  struct tcf_pedit_key_ex *keys_ex, int n)
110 {
111         struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
112 
113         if (!keys_start)
114                 goto nla_failure;
115         for (; n > 0; n--) {
116                 struct nlattr *key_start;
117 
118                 key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
119                 if (!key_start)
120                         goto nla_failure;
121 
122                 if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
123                     nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
124                         goto nla_failure;
125 
126                 nla_nest_end(skb, key_start);
127 
128                 keys_ex++;
129         }
130 
131         nla_nest_end(skb, keys_start);
132 
133         return 0;
134 nla_failure:
135         nla_nest_cancel(skb, keys_start);
136         return -EINVAL;
137 }
138 
139 static int tcf_pedit_init(struct net *net, struct nlattr *nla,
140                           struct nlattr *est, struct tc_action **a,
141                           int ovr, int bind, bool rtnl_held,
142                           struct tcf_proto *tp, struct netlink_ext_ack *extack)
143 {
144         struct tc_action_net *tn = net_generic(net, pedit_net_id);
145         struct nlattr *tb[TCA_PEDIT_MAX + 1];
146         struct tcf_chain *goto_ch = NULL;
147         struct tc_pedit_key *keys = NULL;
148         struct tcf_pedit_key_ex *keys_ex;
149         struct tc_pedit *parm;
150         struct nlattr *pattr;
151         struct tcf_pedit *p;
152         int ret = 0, err;
153         int ksize;
154 
155         if (!nla) {
156                 NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
157                 return -EINVAL;
158         }
159 
160         err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
161         if (err < 0)
162                 return err;
163 
164         pattr = tb[TCA_PEDIT_PARMS];
165         if (!pattr)
166                 pattr = tb[TCA_PEDIT_PARMS_EX];
167         if (!pattr) {
168                 NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
169                 return -EINVAL;
170         }
171 
172         parm = nla_data(pattr);
173         ksize = parm->nkeys * sizeof(struct tc_pedit_key);
174         if (nla_len(pattr) < sizeof(*parm) + ksize) {
175                 NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
176                 return -EINVAL;
177         }
178 
179         keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
180         if (IS_ERR(keys_ex))
181                 return PTR_ERR(keys_ex);
182 
183         err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
184         if (!err) {
185                 if (!parm->nkeys) {
186                         tcf_idr_cleanup(tn, parm->index);
187                         NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
188                         ret = -EINVAL;
189                         goto out_free;
190                 }
191                 ret = tcf_idr_create(tn, parm->index, est, a,
192                                      &act_pedit_ops, bind, false);
193                 if (ret) {
194                         tcf_idr_cleanup(tn, parm->index);
195                         goto out_free;
196                 }
197                 ret = ACT_P_CREATED;
198         } else if (err > 0) {
199                 if (bind)
200                         goto out_free;
201                 if (!ovr) {
202                         ret = -EEXIST;
203                         goto out_release;
204                 }
205         } else {
206                 ret = err;
207                 goto out_free;
208         }
209 
210         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
211         if (err < 0) {
212                 ret = err;
213                 goto out_release;
214         }
215         p = to_pedit(*a);
216         spin_lock_bh(&p->tcf_lock);
217 
218         if (ret == ACT_P_CREATED ||
219             (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
220                 keys = kmalloc(ksize, GFP_ATOMIC);
221                 if (!keys) {
222                         spin_unlock_bh(&p->tcf_lock);
223                         ret = -ENOMEM;
224                         goto put_chain;
225                 }
226                 kfree(p->tcfp_keys);
227                 p->tcfp_keys = keys;
228                 p->tcfp_nkeys = parm->nkeys;
229         }
230         memcpy(p->tcfp_keys, parm->keys, ksize);
231 
232         p->tcfp_flags = parm->flags;
233         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
234 
235         kfree(p->tcfp_keys_ex);
236         p->tcfp_keys_ex = keys_ex;
237 
238         spin_unlock_bh(&p->tcf_lock);
239         if (goto_ch)
240                 tcf_chain_put_by_act(goto_ch);
241         if (ret == ACT_P_CREATED)
242                 tcf_idr_insert(tn, *a);
243         return ret;
244 
245 put_chain:
246         if (goto_ch)
247                 tcf_chain_put_by_act(goto_ch);
248 out_release:
249         tcf_idr_release(*a, bind);
250 out_free:
251         kfree(keys_ex);
252         return ret;
253 
254 }
255 
256 static void tcf_pedit_cleanup(struct tc_action *a)
257 {
258         struct tcf_pedit *p = to_pedit(a);
259         struct tc_pedit_key *keys = p->tcfp_keys;
260 
261         kfree(keys);
262         kfree(p->tcfp_keys_ex);
263 }
264 
265 static bool offset_valid(struct sk_buff *skb, int offset)
266 {
267         if (offset > 0 && offset > skb->len)
268                 return false;
269 
270         if  (offset < 0 && -offset > skb_headroom(skb))
271                 return false;
272 
273         return true;
274 }
275 
276 static int pedit_skb_hdr_offset(struct sk_buff *skb,
277                                 enum pedit_header_type htype, int *hoffset)
278 {
279         int ret = -EINVAL;
280 
281         switch (htype) {
282         case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
283                 if (skb_mac_header_was_set(skb)) {
284                         *hoffset = skb_mac_offset(skb);
285                         ret = 0;
286                 }
287                 break;
288         case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
289         case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
290         case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
291                 *hoffset = skb_network_offset(skb);
292                 ret = 0;
293                 break;
294         case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
295         case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
296                 if (skb_transport_header_was_set(skb)) {
297                         *hoffset = skb_transport_offset(skb);
298                         ret = 0;
299                 }
300                 break;
301         default:
302                 ret = -EINVAL;
303                 break;
304         }
305 
306         return ret;
307 }
308 
309 static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
310                          struct tcf_result *res)
311 {
312         struct tcf_pedit *p = to_pedit(a);
313         int i;
314 
315         if (skb_unclone(skb, GFP_ATOMIC))
316                 return p->tcf_action;
317 
318         spin_lock(&p->tcf_lock);
319 
320         tcf_lastuse_update(&p->tcf_tm);
321 
322         if (p->tcfp_nkeys > 0) {
323                 struct tc_pedit_key *tkey = p->tcfp_keys;
324                 struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
325                 enum pedit_header_type htype =
326                         TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
327                 enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
328 
329                 for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
330                         u32 *ptr, hdata;
331                         int offset = tkey->off;
332                         int hoffset;
333                         u32 val;
334                         int rc;
335 
336                         if (tkey_ex) {
337                                 htype = tkey_ex->htype;
338                                 cmd = tkey_ex->cmd;
339 
340                                 tkey_ex++;
341                         }
342 
343                         rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
344                         if (rc) {
345                                 pr_info("tc action pedit bad header type specified (0x%x)\n",
346                                         htype);
347                                 goto bad;
348                         }
349 
350                         if (tkey->offmask) {
351                                 u8 *d, _d;
352 
353                                 if (!offset_valid(skb, hoffset + tkey->at)) {
354                                         pr_info("tc action pedit 'at' offset %d out of bounds\n",
355                                                 hoffset + tkey->at);
356                                         goto bad;
357                                 }
358                                 d = skb_header_pointer(skb, hoffset + tkey->at,
359                                                        sizeof(_d), &_d);
360                                 if (!d)
361                                         goto bad;
362                                 offset += (*d & tkey->offmask) >> tkey->shift;
363                         }
364 
365                         if (offset % 4) {
366                                 pr_info("tc action pedit offset must be on 32 bit boundaries\n");
367                                 goto bad;
368                         }
369 
370                         if (!offset_valid(skb, hoffset + offset)) {
371                                 pr_info("tc action pedit offset %d out of bounds\n",
372                                         hoffset + offset);
373                                 goto bad;
374                         }
375 
376                         ptr = skb_header_pointer(skb, hoffset + offset,
377                                                  sizeof(hdata), &hdata);
378                         if (!ptr)
379                                 goto bad;
380                         /* just do it, baby */
381                         switch (cmd) {
382                         case TCA_PEDIT_KEY_EX_CMD_SET:
383                                 val = tkey->val;
384                                 break;
385                         case TCA_PEDIT_KEY_EX_CMD_ADD:
386                                 val = (*ptr + tkey->val) & ~tkey->mask;
387                                 break;
388                         default:
389                                 pr_info("tc action pedit bad command (%d)\n",
390                                         cmd);
391                                 goto bad;
392                         }
393 
394                         *ptr = ((*ptr & tkey->mask) ^ val);
395                         if (ptr == &hdata)
396                                 skb_store_bits(skb, hoffset + offset, ptr, 4);
397                 }
398 
399                 goto done;
400         } else {
401                 WARN(1, "pedit BUG: index %d\n", p->tcf_index);
402         }
403 
404 bad:
405         p->tcf_qstats.overlimits++;
406 done:
407         bstats_update(&p->tcf_bstats, skb);
408         spin_unlock(&p->tcf_lock);
409         return p->tcf_action;
410 }
411 
412 static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
413                           int bind, int ref)
414 {
415         unsigned char *b = skb_tail_pointer(skb);
416         struct tcf_pedit *p = to_pedit(a);
417         struct tc_pedit *opt;
418         struct tcf_t t;
419         int s;
420 
421         s = struct_size(opt, keys, p->tcfp_nkeys);
422 
423         /* netlink spinlocks held above us - must use ATOMIC */
424         opt = kzalloc(s, GFP_ATOMIC);
425         if (unlikely(!opt))
426                 return -ENOBUFS;
427 
428         spin_lock_bh(&p->tcf_lock);
429         memcpy(opt->keys, p->tcfp_keys,
430                p->tcfp_nkeys * sizeof(struct tc_pedit_key));
431         opt->index = p->tcf_index;
432         opt->nkeys = p->tcfp_nkeys;
433         opt->flags = p->tcfp_flags;
434         opt->action = p->tcf_action;
435         opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
436         opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
437 
438         if (p->tcfp_keys_ex) {
439                 if (tcf_pedit_key_ex_dump(skb,
440                                           p->tcfp_keys_ex,
441                                           p->tcfp_nkeys))
442                         goto nla_put_failure;
443 
444                 if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
445                         goto nla_put_failure;
446         } else {
447                 if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
448                         goto nla_put_failure;
449         }
450 
451         tcf_tm_dump(&t, &p->tcf_tm);
452         if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
453                 goto nla_put_failure;
454         spin_unlock_bh(&p->tcf_lock);
455 
456         kfree(opt);
457         return skb->len;
458 
459 nla_put_failure:
460         spin_unlock_bh(&p->tcf_lock);
461         nlmsg_trim(skb, b);
462         kfree(opt);
463         return -1;
464 }
465 
466 static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
467                             struct netlink_callback *cb, int type,
468                             const struct tc_action_ops *ops,
469                             struct netlink_ext_ack *extack)
470 {
471         struct tc_action_net *tn = net_generic(net, pedit_net_id);
472 
473         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
474 }
475 
476 static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
477 {
478         struct tc_action_net *tn = net_generic(net, pedit_net_id);
479 
480         return tcf_idr_search(tn, a, index);
481 }
482 
483 static struct tc_action_ops act_pedit_ops = {
484         .kind           =       "pedit",
485         .id             =       TCA_ID_PEDIT,
486         .owner          =       THIS_MODULE,
487         .act            =       tcf_pedit_act,
488         .dump           =       tcf_pedit_dump,
489         .cleanup        =       tcf_pedit_cleanup,
490         .init           =       tcf_pedit_init,
491         .walk           =       tcf_pedit_walker,
492         .lookup         =       tcf_pedit_search,
493         .size           =       sizeof(struct tcf_pedit),
494 };
495 
496 static __net_init int pedit_init_net(struct net *net)
497 {
498         struct tc_action_net *tn = net_generic(net, pedit_net_id);
499 
500         return tc_action_net_init(tn, &act_pedit_ops);
501 }
502 
503 static void __net_exit pedit_exit_net(struct list_head *net_list)
504 {
505         tc_action_net_exit(net_list, pedit_net_id);
506 }
507 
508 static struct pernet_operations pedit_net_ops = {
509         .init = pedit_init_net,
510         .exit_batch = pedit_exit_net,
511         .id   = &pedit_net_id,
512         .size = sizeof(struct tc_action_net),
513 };
514 
515 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
516 MODULE_DESCRIPTION("Generic Packet Editor actions");
517 MODULE_LICENSE("GPL");
518 
519 static int __init pedit_init_module(void)
520 {
521         return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
522 }
523 
524 static void __exit pedit_cleanup_module(void)
525 {
526         tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
527 }
528 
529 module_init(pedit_init_module);
530 module_exit(pedit_cleanup_module);
531 

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