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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_pedit.c Generic packet editor
4 *
5 * Authors: Jamal Hadi Salim (2002-4)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/skbuff.h>
13#include <linux/rtnetlink.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <net/netlink.h>
18#include <net/pkt_sched.h>
19#include <linux/tc_act/tc_pedit.h>
20#include <net/tc_act/tc_pedit.h>
21#include <uapi/linux/tc_act/tc_pedit.h>
22#include <net/pkt_cls.h>
23
24static unsigned int pedit_net_id;
25static struct tc_action_ops act_pedit_ops;
26
27static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
28 [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
29 [TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
30};
31
32static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
33 [TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
34 [TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
35};
36
37static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
38 u8 n)
39{
40 struct tcf_pedit_key_ex *keys_ex;
41 struct tcf_pedit_key_ex *k;
42 const struct nlattr *ka;
43 int err = -EINVAL;
44 int rem;
45
46 if (!nla)
47 return NULL;
48
49 keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
50 if (!keys_ex)
51 return ERR_PTR(-ENOMEM);
52
53 k = keys_ex;
54
55 nla_for_each_nested(ka, nla, rem) {
56 struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
57
58 if (!n) {
59 err = -EINVAL;
60 goto err_out;
61 }
62 n--;
63
64 if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
65 err = -EINVAL;
66 goto err_out;
67 }
68
69 err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
70 ka, pedit_key_ex_policy,
71 NULL);
72 if (err)
73 goto err_out;
74
75 if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
76 !tb[TCA_PEDIT_KEY_EX_CMD]) {
77 err = -EINVAL;
78 goto err_out;
79 }
80
81 k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
82 k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
83
84 if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
85 k->cmd > TCA_PEDIT_CMD_MAX) {
86 err = -EINVAL;
87 goto err_out;
88 }
89
90 k++;
91 }
92
93 if (n) {
94 err = -EINVAL;
95 goto err_out;
96 }
97
98 return keys_ex;
99
100err_out:
101 kfree(keys_ex);
102 return ERR_PTR(err);
103}
104
105static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
106 struct tcf_pedit_key_ex *keys_ex, int n)
107{
108 struct nlattr *keys_start = nla_nest_start_noflag(skb,
109 TCA_PEDIT_KEYS_EX);
110
111 if (!keys_start)
112 goto nla_failure;
113 for (; n > 0; n--) {
114 struct nlattr *key_start;
115
116 key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
117 if (!key_start)
118 goto nla_failure;
119
120 if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
121 nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
122 goto nla_failure;
123
124 nla_nest_end(skb, key_start);
125
126 keys_ex++;
127 }
128
129 nla_nest_end(skb, keys_start);
130
131 return 0;
132nla_failure:
133 nla_nest_cancel(skb, keys_start);
134 return -EINVAL;
135}
136
137static int tcf_pedit_init(struct net *net, struct nlattr *nla,
138 struct nlattr *est, struct tc_action **a,
139 int ovr, int bind, bool rtnl_held,
140 struct tcf_proto *tp, struct netlink_ext_ack *extack)
141{
142 struct tc_action_net *tn = net_generic(net, pedit_net_id);
143 struct nlattr *tb[TCA_PEDIT_MAX + 1];
144 struct tcf_chain *goto_ch = NULL;
145 struct tc_pedit_key *keys = NULL;
146 struct tcf_pedit_key_ex *keys_ex;
147 struct tc_pedit *parm;
148 struct nlattr *pattr;
149 struct tcf_pedit *p;
150 int ret = 0, err;
151 int ksize;
152 u32 index;
153
154 if (!nla) {
155 NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
156 return -EINVAL;
157 }
158
159 err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
160 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 if (!parm->nkeys) {
174 NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
175 return -EINVAL;
176 }
177 ksize = parm->nkeys * sizeof(struct tc_pedit_key);
178 if (nla_len(pattr) < sizeof(*parm) + ksize) {
179 NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
180 return -EINVAL;
181 }
182
183 keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
184 if (IS_ERR(keys_ex))
185 return PTR_ERR(keys_ex);
186
187 index = parm->index;
188 err = tcf_idr_check_alloc(tn, &index, a, bind);
189 if (!err) {
190 ret = tcf_idr_create(tn, index, est, a,
191 &act_pedit_ops, bind, false);
192 if (ret) {
193 tcf_idr_cleanup(tn, index);
194 goto out_free;
195 }
196 ret = ACT_P_CREATED;
197 } else if (err > 0) {
198 if (bind)
199 goto out_free;
200 if (!ovr) {
201 ret = -EEXIST;
202 goto out_release;
203 }
204 } else {
205 ret = err;
206 goto out_free;
207 }
208
209 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
210 if (err < 0) {
211 ret = err;
212 goto out_release;
213 }
214 p = to_pedit(*a);
215 spin_lock_bh(&p->tcf_lock);
216
217 if (ret == ACT_P_CREATED ||
218 (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
219 keys = kmalloc(ksize, GFP_ATOMIC);
220 if (!keys) {
221 spin_unlock_bh(&p->tcf_lock);
222 ret = -ENOMEM;
223 goto put_chain;
224 }
225 kfree(p->tcfp_keys);
226 p->tcfp_keys = keys;
227 p->tcfp_nkeys = parm->nkeys;
228 }
229 memcpy(p->tcfp_keys, parm->keys, ksize);
230
231 p->tcfp_flags = parm->flags;
232 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
233
234 kfree(p->tcfp_keys_ex);
235 p->tcfp_keys_ex = keys_ex;
236
237 spin_unlock_bh(&p->tcf_lock);
238 if (goto_ch)
239 tcf_chain_put_by_act(goto_ch);
240 if (ret == ACT_P_CREATED)
241 tcf_idr_insert(tn, *a);
242 return ret;
243
244put_chain:
245 if (goto_ch)
246 tcf_chain_put_by_act(goto_ch);
247out_release:
248 tcf_idr_release(*a, bind);
249out_free:
250 kfree(keys_ex);
251 return ret;
252
253}
254
255static void tcf_pedit_cleanup(struct tc_action *a)
256{
257 struct tcf_pedit *p = to_pedit(a);
258 struct tc_pedit_key *keys = p->tcfp_keys;
259
260 kfree(keys);
261 kfree(p->tcfp_keys_ex);
262}
263
264static bool offset_valid(struct sk_buff *skb, int offset)
265{
266 if (offset > 0 && offset > skb->len)
267 return false;
268
269 if (offset < 0 && -offset > skb_headroom(skb))
270 return false;
271
272 return true;
273}
274
275static int pedit_skb_hdr_offset(struct sk_buff *skb,
276 enum pedit_header_type htype, int *hoffset)
277{
278 int ret = -EINVAL;
279
280 switch (htype) {
281 case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
282 if (skb_mac_header_was_set(skb)) {
283 *hoffset = skb_mac_offset(skb);
284 ret = 0;
285 }
286 break;
287 case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
288 case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
289 case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
290 *hoffset = skb_network_offset(skb);
291 ret = 0;
292 break;
293 case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
294 case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
295 if (skb_transport_header_was_set(skb)) {
296 *hoffset = skb_transport_offset(skb);
297 ret = 0;
298 }
299 break;
300 default:
301 ret = -EINVAL;
302 break;
303 }
304
305 return ret;
306}
307
308static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
309 struct tcf_result *res)
310{
311 struct tcf_pedit *p = to_pedit(a);
312 int i;
313
314 if (skb_unclone(skb, GFP_ATOMIC))
315 return p->tcf_action;
316
317 spin_lock(&p->tcf_lock);
318
319 tcf_lastuse_update(&p->tcf_tm);
320
321 if (p->tcfp_nkeys > 0) {
322 struct tc_pedit_key *tkey = p->tcfp_keys;
323 struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
324 enum pedit_header_type htype =
325 TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
326 enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
327
328 for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
329 u32 *ptr, hdata;
330 int offset = tkey->off;
331 int hoffset;
332 u32 val;
333 int rc;
334
335 if (tkey_ex) {
336 htype = tkey_ex->htype;
337 cmd = tkey_ex->cmd;
338
339 tkey_ex++;
340 }
341
342 rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
343 if (rc) {
344 pr_info("tc action pedit bad header type specified (0x%x)\n",
345 htype);
346 goto bad;
347 }
348
349 if (tkey->offmask) {
350 u8 *d, _d;
351
352 if (!offset_valid(skb, hoffset + tkey->at)) {
353 pr_info("tc action pedit 'at' offset %d out of bounds\n",
354 hoffset + tkey->at);
355 goto bad;
356 }
357 d = skb_header_pointer(skb, hoffset + tkey->at,
358 sizeof(_d), &_d);
359 if (!d)
360 goto bad;
361 offset += (*d & tkey->offmask) >> tkey->shift;
362 }
363
364 if (offset % 4) {
365 pr_info("tc action pedit offset must be on 32 bit boundaries\n");
366 goto bad;
367 }
368
369 if (!offset_valid(skb, hoffset + offset)) {
370 pr_info("tc action pedit offset %d out of bounds\n",
371 hoffset + offset);
372 goto bad;
373 }
374
375 ptr = skb_header_pointer(skb, hoffset + offset,
376 sizeof(hdata), &hdata);
377 if (!ptr)
378 goto bad;
379 /* just do it, baby */
380 switch (cmd) {
381 case TCA_PEDIT_KEY_EX_CMD_SET:
382 val = tkey->val;
383 break;
384 case TCA_PEDIT_KEY_EX_CMD_ADD:
385 val = (*ptr + tkey->val) & ~tkey->mask;
386 break;
387 default:
388 pr_info("tc action pedit bad command (%d)\n",
389 cmd);
390 goto bad;
391 }
392
393 *ptr = ((*ptr & tkey->mask) ^ val);
394 if (ptr == &hdata)
395 skb_store_bits(skb, hoffset + offset, ptr, 4);
396 }
397
398 goto done;
399 } else {
400 WARN(1, "pedit BUG: index %d\n", p->tcf_index);
401 }
402
403bad:
404 p->tcf_qstats.overlimits++;
405done:
406 bstats_update(&p->tcf_bstats, skb);
407 spin_unlock(&p->tcf_lock);
408 return p->tcf_action;
409}
410
411static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
412 int bind, int ref)
413{
414 unsigned char *b = skb_tail_pointer(skb);
415 struct tcf_pedit *p = to_pedit(a);
416 struct tc_pedit *opt;
417 struct tcf_t t;
418 int s;
419
420 s = struct_size(opt, keys, p->tcfp_nkeys);
421
422 /* netlink spinlocks held above us - must use ATOMIC */
423 opt = kzalloc(s, GFP_ATOMIC);
424 if (unlikely(!opt))
425 return -ENOBUFS;
426
427 spin_lock_bh(&p->tcf_lock);
428 memcpy(opt->keys, p->tcfp_keys,
429 p->tcfp_nkeys * sizeof(struct tc_pedit_key));
430 opt->index = p->tcf_index;
431 opt->nkeys = p->tcfp_nkeys;
432 opt->flags = p->tcfp_flags;
433 opt->action = p->tcf_action;
434 opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
435 opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
436
437 if (p->tcfp_keys_ex) {
438 if (tcf_pedit_key_ex_dump(skb,
439 p->tcfp_keys_ex,
440 p->tcfp_nkeys))
441 goto nla_put_failure;
442
443 if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
444 goto nla_put_failure;
445 } else {
446 if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
447 goto nla_put_failure;
448 }
449
450 tcf_tm_dump(&t, &p->tcf_tm);
451 if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
452 goto nla_put_failure;
453 spin_unlock_bh(&p->tcf_lock);
454
455 kfree(opt);
456 return skb->len;
457
458nla_put_failure:
459 spin_unlock_bh(&p->tcf_lock);
460 nlmsg_trim(skb, b);
461 kfree(opt);
462 return -1;
463}
464
465static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
466 struct netlink_callback *cb, int type,
467 const struct tc_action_ops *ops,
468 struct netlink_ext_ack *extack)
469{
470 struct tc_action_net *tn = net_generic(net, pedit_net_id);
471
472 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
473}
474
475static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
476{
477 struct tc_action_net *tn = net_generic(net, pedit_net_id);
478
479 return tcf_idr_search(tn, a, index);
480}
481
482static struct tc_action_ops act_pedit_ops = {
483 .kind = "pedit",
484 .id = TCA_ID_PEDIT,
485 .owner = THIS_MODULE,
486 .act = tcf_pedit_act,
487 .dump = tcf_pedit_dump,
488 .cleanup = tcf_pedit_cleanup,
489 .init = tcf_pedit_init,
490 .walk = tcf_pedit_walker,
491 .lookup = tcf_pedit_search,
492 .size = sizeof(struct tcf_pedit),
493};
494
495static __net_init int pedit_init_net(struct net *net)
496{
497 struct tc_action_net *tn = net_generic(net, pedit_net_id);
498
499 return tc_action_net_init(net, tn, &act_pedit_ops);
500}
501
502static void __net_exit pedit_exit_net(struct list_head *net_list)
503{
504 tc_action_net_exit(net_list, pedit_net_id);
505}
506
507static struct pernet_operations pedit_net_ops = {
508 .init = pedit_init_net,
509 .exit_batch = pedit_exit_net,
510 .id = &pedit_net_id,
511 .size = sizeof(struct tc_action_net),
512};
513
514MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
515MODULE_DESCRIPTION("Generic Packet Editor actions");
516MODULE_LICENSE("GPL");
517
518static int __init pedit_init_module(void)
519{
520 return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
521}
522
523static void __exit pedit_cleanup_module(void)
524{
525 tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
526}
527
528module_init(pedit_init_module);
529module_exit(pedit_cleanup_module);
1/*
2 * net/sched/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
26#define PEDIT_TAB_MASK 15
27static struct tcf_common *tcf_pedit_ht[PEDIT_TAB_MASK + 1];
28static u32 pedit_idx_gen;
29static DEFINE_RWLOCK(pedit_lock);
30
31static struct tcf_hashinfo pedit_hash_info = {
32 .htab = tcf_pedit_ht,
33 .hmask = PEDIT_TAB_MASK,
34 .lock = &pedit_lock,
35};
36
37static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
38 [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
39};
40
41static int tcf_pedit_init(struct nlattr *nla, struct nlattr *est,
42 struct tc_action *a, int ovr, int bind)
43{
44 struct nlattr *tb[TCA_PEDIT_MAX + 1];
45 struct tc_pedit *parm;
46 int ret = 0, err;
47 struct tcf_pedit *p;
48 struct tcf_common *pc;
49 struct tc_pedit_key *keys = NULL;
50 int ksize;
51
52 if (nla == NULL)
53 return -EINVAL;
54
55 err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
56 if (err < 0)
57 return err;
58
59 if (tb[TCA_PEDIT_PARMS] == NULL)
60 return -EINVAL;
61 parm = nla_data(tb[TCA_PEDIT_PARMS]);
62 ksize = parm->nkeys * sizeof(struct tc_pedit_key);
63 if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
64 return -EINVAL;
65
66 pc = tcf_hash_check(parm->index, a, bind, &pedit_hash_info);
67 if (!pc) {
68 if (!parm->nkeys)
69 return -EINVAL;
70 pc = tcf_hash_create(parm->index, est, a, sizeof(*p), bind,
71 &pedit_idx_gen, &pedit_hash_info);
72 if (IS_ERR(pc))
73 return PTR_ERR(pc);
74 p = to_pedit(pc);
75 keys = kmalloc(ksize, GFP_KERNEL);
76 if (keys == NULL) {
77 kfree(pc);
78 return -ENOMEM;
79 }
80 ret = ACT_P_CREATED;
81 } else {
82 p = to_pedit(pc);
83 if (!ovr) {
84 tcf_hash_release(pc, bind, &pedit_hash_info);
85 return -EEXIST;
86 }
87 if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
88 keys = kmalloc(ksize, GFP_KERNEL);
89 if (keys == NULL)
90 return -ENOMEM;
91 }
92 }
93
94 spin_lock_bh(&p->tcf_lock);
95 p->tcfp_flags = parm->flags;
96 p->tcf_action = parm->action;
97 if (keys) {
98 kfree(p->tcfp_keys);
99 p->tcfp_keys = keys;
100 p->tcfp_nkeys = parm->nkeys;
101 }
102 memcpy(p->tcfp_keys, parm->keys, ksize);
103 spin_unlock_bh(&p->tcf_lock);
104 if (ret == ACT_P_CREATED)
105 tcf_hash_insert(pc, &pedit_hash_info);
106 return ret;
107}
108
109static int tcf_pedit_cleanup(struct tc_action *a, int bind)
110{
111 struct tcf_pedit *p = a->priv;
112
113 if (p) {
114 struct tc_pedit_key *keys = p->tcfp_keys;
115 if (tcf_hash_release(&p->common, bind, &pedit_hash_info)) {
116 kfree(keys);
117 return 1;
118 }
119 }
120 return 0;
121}
122
123static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
124 struct tcf_result *res)
125{
126 struct tcf_pedit *p = a->priv;
127 int i, munged = 0;
128 unsigned int off;
129
130 if (skb_cloned(skb) &&
131 pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
132 return p->tcf_action;
133
134 off = skb_network_offset(skb);
135
136 spin_lock(&p->tcf_lock);
137
138 p->tcf_tm.lastuse = jiffies;
139
140 if (p->tcfp_nkeys > 0) {
141 struct tc_pedit_key *tkey = p->tcfp_keys;
142
143 for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
144 u32 *ptr, _data;
145 int offset = tkey->off;
146
147 if (tkey->offmask) {
148 char *d, _d;
149
150 d = skb_header_pointer(skb, off + tkey->at, 1,
151 &_d);
152 if (!d)
153 goto bad;
154 offset += (*d & tkey->offmask) >> tkey->shift;
155 }
156
157 if (offset % 4) {
158 pr_info("tc filter pedit"
159 " offset must be on 32 bit boundaries\n");
160 goto bad;
161 }
162 if (offset > 0 && offset > skb->len) {
163 pr_info("tc filter pedit"
164 " offset %d can't exceed pkt length %d\n",
165 offset, skb->len);
166 goto bad;
167 }
168
169 ptr = skb_header_pointer(skb, off + offset, 4, &_data);
170 if (!ptr)
171 goto bad;
172 /* just do it, baby */
173 *ptr = ((*ptr & tkey->mask) ^ tkey->val);
174 if (ptr == &_data)
175 skb_store_bits(skb, off + offset, ptr, 4);
176 munged++;
177 }
178
179 if (munged)
180 skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
181 goto done;
182 } else
183 WARN(1, "pedit BUG: index %d\n", p->tcf_index);
184
185bad:
186 p->tcf_qstats.overlimits++;
187done:
188 bstats_update(&p->tcf_bstats, skb);
189 spin_unlock(&p->tcf_lock);
190 return p->tcf_action;
191}
192
193static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
194 int bind, int ref)
195{
196 unsigned char *b = skb_tail_pointer(skb);
197 struct tcf_pedit *p = a->priv;
198 struct tc_pedit *opt;
199 struct tcf_t t;
200 int s;
201
202 s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
203
204 /* netlink spinlocks held above us - must use ATOMIC */
205 opt = kzalloc(s, GFP_ATOMIC);
206 if (unlikely(!opt))
207 return -ENOBUFS;
208
209 memcpy(opt->keys, p->tcfp_keys,
210 p->tcfp_nkeys * sizeof(struct tc_pedit_key));
211 opt->index = p->tcf_index;
212 opt->nkeys = p->tcfp_nkeys;
213 opt->flags = p->tcfp_flags;
214 opt->action = p->tcf_action;
215 opt->refcnt = p->tcf_refcnt - ref;
216 opt->bindcnt = p->tcf_bindcnt - bind;
217
218 NLA_PUT(skb, TCA_PEDIT_PARMS, s, opt);
219 t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
220 t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
221 t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
222 NLA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t);
223 kfree(opt);
224 return skb->len;
225
226nla_put_failure:
227 nlmsg_trim(skb, b);
228 kfree(opt);
229 return -1;
230}
231
232static struct tc_action_ops act_pedit_ops = {
233 .kind = "pedit",
234 .hinfo = &pedit_hash_info,
235 .type = TCA_ACT_PEDIT,
236 .capab = TCA_CAP_NONE,
237 .owner = THIS_MODULE,
238 .act = tcf_pedit,
239 .dump = tcf_pedit_dump,
240 .cleanup = tcf_pedit_cleanup,
241 .lookup = tcf_hash_search,
242 .init = tcf_pedit_init,
243 .walk = tcf_generic_walker
244};
245
246MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
247MODULE_DESCRIPTION("Generic Packet Editor actions");
248MODULE_LICENSE("GPL");
249
250static int __init pedit_init_module(void)
251{
252 return tcf_register_action(&act_pedit_ops);
253}
254
255static void __exit pedit_cleanup_module(void)
256{
257 tcf_unregister_action(&act_pedit_ops);
258}
259
260module_init(pedit_init_module);
261module_exit(pedit_cleanup_module);
262