xref: /openbmc/linux/net/sched/act_pedit.c (revision 6aeadf78) 
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/ip.h>
17 #include <linux/ipv6.h>
18 #include <linux/slab.h>
19 #include <net/ipv6.h>
20 #include <net/netlink.h>
21 #include <net/pkt_sched.h>
22 #include <linux/tc_act/tc_pedit.h>
23 #include <net/tc_act/tc_pedit.h>
24 #include <uapi/linux/tc_act/tc_pedit.h>
25 #include <net/pkt_cls.h>
26 #include <net/tc_wrapper.h>
27 
28 static struct tc_action_ops act_pedit_ops;
29 
30 static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
31 	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },
32 	[TCA_PEDIT_KEYS_EX]   = { .type = NLA_NESTED },
33 };
34 
35 static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
36 	[TCA_PEDIT_KEY_EX_HTYPE] =
37 		NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_HDR_TYPE_MAX),
38 	[TCA_PEDIT_KEY_EX_CMD] = NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_CMD_MAX),
39 };
40 
41 static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
42 							u8 n, struct netlink_ext_ack *extack)
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)
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 			NL_SET_ERR_MSG_MOD(extack, "Can't parse more extended keys than requested");
64 			err = -EINVAL;
65 			goto err_out;
66 		}
67 		n--;
68 
69 		if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
70 			NL_SET_ERR_MSG_ATTR(extack, ka, "Unknown attribute, expected extended key");
71 			err = -EINVAL;
72 			goto err_out;
73 		}
74 
75 		err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
76 						  ka, pedit_key_ex_policy,
77 						  NULL);
78 		if (err)
79 			goto err_out;
80 
81 		if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_HTYPE)) {
82 			NL_SET_ERR_MSG(extack, "Missing required attribute");
83 			err = -EINVAL;
84 			goto err_out;
85 		}
86 
87 		if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_CMD)) {
88 			NL_SET_ERR_MSG(extack, "Missing required attribute");
89 			err = -EINVAL;
90 			goto err_out;
91 		}
92 
93 		k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
94 		k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
95 
96 		k++;
97 	}
98 
99 	if (n) {
100 		NL_SET_ERR_MSG_MOD(extack, "Not enough extended keys to parse");
101 		err = -EINVAL;
102 		goto err_out;
103 	}
104 
105 	return keys_ex;
106 
107 err_out:
108 	kfree(keys_ex);
109 	return ERR_PTR(err);
110 }
111 
112 static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
113 				 struct tcf_pedit_key_ex *keys_ex, int n)
114 {
115 	struct nlattr *keys_start = nla_nest_start_noflag(skb,
116 							  TCA_PEDIT_KEYS_EX);
117 
118 	if (!keys_start)
119 		goto nla_failure;
120 	for (; n > 0; n--) {
121 		struct nlattr *key_start;
122 
123 		key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
124 		if (!key_start)
125 			goto nla_failure;
126 
127 		if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
128 		    nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
129 			goto nla_failure;
130 
131 		nla_nest_end(skb, key_start);
132 
133 		keys_ex++;
134 	}
135 
136 	nla_nest_end(skb, keys_start);
137 
138 	return 0;
139 nla_failure:
140 	nla_nest_cancel(skb, keys_start);
141 	return -EINVAL;
142 }
143 
144 static void tcf_pedit_cleanup_rcu(struct rcu_head *head)
145 {
146 	struct tcf_pedit_parms *parms =
147 		container_of(head, struct tcf_pedit_parms, rcu);
148 
149 	kfree(parms->tcfp_keys_ex);
150 	kfree(parms->tcfp_keys);
151 
152 	kfree(parms);
153 }
154 
155 static int tcf_pedit_init(struct net *net, struct nlattr *nla,
156 			  struct nlattr *est, struct tc_action **a,
157 			  struct tcf_proto *tp, u32 flags,
158 			  struct netlink_ext_ack *extack)
159 {
160 	struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
161 	bool bind = flags & TCA_ACT_FLAGS_BIND;
162 	struct tcf_chain *goto_ch = NULL;
163 	struct tcf_pedit_parms *oparms, *nparms;
164 	struct nlattr *tb[TCA_PEDIT_MAX + 1];
165 	struct tc_pedit *parm;
166 	struct nlattr *pattr;
167 	struct tcf_pedit *p;
168 	int ret = 0, err;
169 	int i, ksize;
170 	u32 index;
171 
172 	if (!nla) {
173 		NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
174 		return -EINVAL;
175 	}
176 
177 	err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
178 					  pedit_policy, NULL);
179 	if (err < 0)
180 		return err;
181 
182 	pattr = tb[TCA_PEDIT_PARMS];
183 	if (!pattr)
184 		pattr = tb[TCA_PEDIT_PARMS_EX];
185 	if (!pattr) {
186 		NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
187 		return -EINVAL;
188 	}
189 
190 	parm = nla_data(pattr);
191 
192 	index = parm->index;
193 	err = tcf_idr_check_alloc(tn, &index, a, bind);
194 	if (!err) {
195 		ret = tcf_idr_create_from_flags(tn, index, est, a,
196 						&act_pedit_ops, bind, flags);
197 		if (ret) {
198 			tcf_idr_cleanup(tn, index);
199 			return ret;
200 		}
201 		ret = ACT_P_CREATED;
202 	} else if (err > 0) {
203 		if (bind)
204 			return 0;
205 		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
206 			ret = -EEXIST;
207 			goto out_release;
208 		}
209 	} else {
210 		return err;
211 	}
212 
213 	if (!parm->nkeys) {
214 		NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
215 		ret = -EINVAL;
216 		goto out_release;
217 	}
218 	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
219 	if (nla_len(pattr) < sizeof(*parm) + ksize) {
220 		NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
221 		ret = -EINVAL;
222 		goto out_release;
223 	}
224 
225 	nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
226 	if (!nparms) {
227 		ret = -ENOMEM;
228 		goto out_release;
229 	}
230 
231 	nparms->tcfp_keys_ex =
232 		tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys, extack);
233 	if (IS_ERR(nparms->tcfp_keys_ex)) {
234 		ret = PTR_ERR(nparms->tcfp_keys_ex);
235 		goto out_free;
236 	}
237 
238 	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
239 	if (err < 0) {
240 		ret = err;
241 		goto out_free_ex;
242 	}
243 
244 	nparms->tcfp_off_max_hint = 0;
245 	nparms->tcfp_flags = parm->flags;
246 	nparms->tcfp_nkeys = parm->nkeys;
247 
248 	nparms->tcfp_keys = kmalloc(ksize, GFP_KERNEL);
249 	if (!nparms->tcfp_keys) {
250 		ret = -ENOMEM;
251 		goto put_chain;
252 	}
253 
254 	memcpy(nparms->tcfp_keys, parm->keys, ksize);
255 
256 	for (i = 0; i < nparms->tcfp_nkeys; ++i) {
257 		u32 offmask = nparms->tcfp_keys[i].offmask;
258 		u32 cur = nparms->tcfp_keys[i].off;
259 
260 		/* The AT option can be added to static offsets in the datapath */
261 		if (!offmask && cur % 4) {
262 			NL_SET_ERR_MSG_MOD(extack, "Offsets must be on 32bit boundaries");
263 			ret = -EINVAL;
264 			goto out_free_keys;
265 		}
266 
267 		/* sanitize the shift value for any later use */
268 		nparms->tcfp_keys[i].shift = min_t(size_t,
269 						   BITS_PER_TYPE(int) - 1,
270 						   nparms->tcfp_keys[i].shift);
271 
272 		/* The AT option can read a single byte, we can bound the actual
273 		 * value with uchar max.
274 		 */
275 		cur += (0xff & offmask) >> nparms->tcfp_keys[i].shift;
276 
277 		/* Each key touches 4 bytes starting from the computed offset */
278 		nparms->tcfp_off_max_hint =
279 			max(nparms->tcfp_off_max_hint, cur + 4);
280 	}
281 
282 	p = to_pedit(*a);
283 
284 	spin_lock_bh(&p->tcf_lock);
285 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
286 	oparms = rcu_replace_pointer(p->parms, nparms, 1);
287 	spin_unlock_bh(&p->tcf_lock);
288 
289 	if (oparms)
290 		call_rcu(&oparms->rcu, tcf_pedit_cleanup_rcu);
291 
292 	if (goto_ch)
293 		tcf_chain_put_by_act(goto_ch);
294 
295 	return ret;
296 
297 out_free_keys:
298 	kfree(nparms->tcfp_keys);
299 put_chain:
300 	if (goto_ch)
301 		tcf_chain_put_by_act(goto_ch);
302 out_free_ex:
303 	kfree(nparms->tcfp_keys_ex);
304 out_free:
305 	kfree(nparms);
306 out_release:
307 	tcf_idr_release(*a, bind);
308 	return ret;
309 }
310 
311 static void tcf_pedit_cleanup(struct tc_action *a)
312 {
313 	struct tcf_pedit *p = to_pedit(a);
314 	struct tcf_pedit_parms *parms;
315 
316 	parms = rcu_dereference_protected(p->parms, 1);
317 
318 	if (parms)
319 		call_rcu(&parms->rcu, tcf_pedit_cleanup_rcu);
320 }
321 
322 static bool offset_valid(struct sk_buff *skb, int offset)
323 {
324 	if (offset > 0 && offset > skb->len)
325 		return false;
326 
327 	if  (offset < 0 && -offset > skb_headroom(skb))
328 		return false;
329 
330 	return true;
331 }
332 
333 static int pedit_l4_skb_offset(struct sk_buff *skb, int *hoffset, const int header_type)
334 {
335 	const int noff = skb_network_offset(skb);
336 	int ret = -EINVAL;
337 	struct iphdr _iph;
338 
339 	switch (skb->protocol) {
340 	case htons(ETH_P_IP): {
341 		const struct iphdr *iph = skb_header_pointer(skb, noff, sizeof(_iph), &_iph);
342 
343 		if (!iph)
344 			goto out;
345 		*hoffset = noff + iph->ihl * 4;
346 		ret = 0;
347 		break;
348 	}
349 	case htons(ETH_P_IPV6):
350 		ret = ipv6_find_hdr(skb, hoffset, header_type, NULL, NULL) == header_type ? 0 : -EINVAL;
351 		break;
352 	}
353 out:
354 	return ret;
355 }
356 
357 static int pedit_skb_hdr_offset(struct sk_buff *skb,
358 				 enum pedit_header_type htype, int *hoffset)
359 {
360 	int ret = -EINVAL;
361 	/* 'htype' is validated in the netlink parsing */
362 	switch (htype) {
363 	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
364 		if (skb_mac_header_was_set(skb)) {
365 			*hoffset = skb_mac_offset(skb);
366 			ret = 0;
367 		}
368 		break;
369 	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
370 	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
371 	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
372 		*hoffset = skb_network_offset(skb);
373 		ret = 0;
374 		break;
375 	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
376 		ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_TCP);
377 		break;
378 	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
379 		ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_UDP);
380 		break;
381 	default:
382 		break;
383 	}
384 	return ret;
385 }
386 
387 TC_INDIRECT_SCOPE int tcf_pedit_act(struct sk_buff *skb,
388 				    const struct tc_action *a,
389 				    struct tcf_result *res)
390 {
391 	enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
392 	enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
393 	struct tcf_pedit *p = to_pedit(a);
394 	struct tcf_pedit_key_ex *tkey_ex;
395 	struct tcf_pedit_parms *parms;
396 	struct tc_pedit_key *tkey;
397 	u32 max_offset;
398 	int i;
399 
400 	parms = rcu_dereference_bh(p->parms);
401 
402 	max_offset = (skb_transport_header_was_set(skb) ?
403 		      skb_transport_offset(skb) :
404 		      skb_network_offset(skb)) +
405 		     parms->tcfp_off_max_hint;
406 	if (skb_ensure_writable(skb, min(skb->len, max_offset)))
407 		goto done;
408 
409 	tcf_lastuse_update(&p->tcf_tm);
410 	tcf_action_update_bstats(&p->common, skb);
411 
412 	tkey = parms->tcfp_keys;
413 	tkey_ex = parms->tcfp_keys_ex;
414 
415 	for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) {
416 		int offset = tkey->off;
417 		int hoffset = 0;
418 		u32 *ptr, hdata;
419 		u32 val;
420 		int rc;
421 
422 		if (tkey_ex) {
423 			htype = tkey_ex->htype;
424 			cmd = tkey_ex->cmd;
425 
426 			tkey_ex++;
427 		}
428 
429 		rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
430 		if (rc) {
431 			pr_info_ratelimited("tc action pedit unable to extract header offset for header type (0x%x)\n", htype);
432 			goto bad;
433 		}
434 
435 		if (tkey->offmask) {
436 			u8 *d, _d;
437 
438 			if (!offset_valid(skb, hoffset + tkey->at)) {
439 				pr_info_ratelimited("tc action pedit 'at' offset %d out of bounds\n",
440 						    hoffset + tkey->at);
441 				goto bad;
442 			}
443 			d = skb_header_pointer(skb, hoffset + tkey->at,
444 					       sizeof(_d), &_d);
445 			if (!d)
446 				goto bad;
447 
448 			offset += (*d & tkey->offmask) >> tkey->shift;
449 			if (offset % 4) {
450 				pr_info_ratelimited("tc action pedit offset must be on 32 bit boundaries\n");
451 				goto bad;
452 			}
453 		}
454 
455 		if (!offset_valid(skb, hoffset + offset)) {
456 			pr_info_ratelimited("tc action pedit offset %d out of bounds\n", hoffset + offset);
457 			goto bad;
458 		}
459 
460 		ptr = skb_header_pointer(skb, hoffset + offset,
461 					 sizeof(hdata), &hdata);
462 		if (!ptr)
463 			goto bad;
464 		/* just do it, baby */
465 		switch (cmd) {
466 		case TCA_PEDIT_KEY_EX_CMD_SET:
467 			val = tkey->val;
468 			break;
469 		case TCA_PEDIT_KEY_EX_CMD_ADD:
470 			val = (*ptr + tkey->val) & ~tkey->mask;
471 			break;
472 		default:
473 			pr_info_ratelimited("tc action pedit bad command (%d)\n", cmd);
474 			goto bad;
475 		}
476 
477 		*ptr = ((*ptr & tkey->mask) ^ val);
478 		if (ptr == &hdata)
479 			skb_store_bits(skb, hoffset + offset, ptr, 4);
480 	}
481 
482 	goto done;
483 
484 bad:
485 	tcf_action_inc_overlimit_qstats(&p->common);
486 done:
487 	return p->tcf_action;
488 }
489 
490 static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets,
491 				   u64 drops, u64 lastuse, bool hw)
492 {
493 	struct tcf_pedit *d = to_pedit(a);
494 	struct tcf_t *tm = &d->tcf_tm;
495 
496 	tcf_action_update_stats(a, bytes, packets, drops, hw);
497 	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
498 }
499 
500 static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
501 			  int bind, int ref)
502 {
503 	unsigned char *b = skb_tail_pointer(skb);
504 	struct tcf_pedit *p = to_pedit(a);
505 	struct tcf_pedit_parms *parms;
506 	struct tc_pedit *opt;
507 	struct tcf_t t;
508 	int s;
509 
510 	spin_lock_bh(&p->tcf_lock);
511 	parms = rcu_dereference_protected(p->parms, 1);
512 	s = struct_size(opt, keys, parms->tcfp_nkeys);
513 
514 	opt = kzalloc(s, GFP_ATOMIC);
515 	if (unlikely(!opt)) {
516 		spin_unlock_bh(&p->tcf_lock);
517 		return -ENOBUFS;
518 	}
519 
520 	memcpy(opt->keys, parms->tcfp_keys,
521 	       flex_array_size(opt, keys, parms->tcfp_nkeys));
522 	opt->index = p->tcf_index;
523 	opt->nkeys = parms->tcfp_nkeys;
524 	opt->flags = parms->tcfp_flags;
525 	opt->action = p->tcf_action;
526 	opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
527 	opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
528 
529 	if (parms->tcfp_keys_ex) {
530 		if (tcf_pedit_key_ex_dump(skb, parms->tcfp_keys_ex,
531 					  parms->tcfp_nkeys))
532 			goto nla_put_failure;
533 
534 		if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
535 			goto nla_put_failure;
536 	} else {
537 		if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
538 			goto nla_put_failure;
539 	}
540 
541 	tcf_tm_dump(&t, &p->tcf_tm);
542 	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
543 		goto nla_put_failure;
544 	spin_unlock_bh(&p->tcf_lock);
545 
546 	kfree(opt);
547 	return skb->len;
548 
549 nla_put_failure:
550 	spin_unlock_bh(&p->tcf_lock);
551 	nlmsg_trim(skb, b);
552 	kfree(opt);
553 	return -1;
554 }
555 
556 static int tcf_pedit_offload_act_setup(struct tc_action *act, void *entry_data,
557 				       u32 *index_inc, bool bind,
558 				       struct netlink_ext_ack *extack)
559 {
560 	if (bind) {
561 		struct flow_action_entry *entry = entry_data;
562 		int k;
563 
564 		for (k = 0; k < tcf_pedit_nkeys(act); k++) {
565 			switch (tcf_pedit_cmd(act, k)) {
566 			case TCA_PEDIT_KEY_EX_CMD_SET:
567 				entry->id = FLOW_ACTION_MANGLE;
568 				break;
569 			case TCA_PEDIT_KEY_EX_CMD_ADD:
570 				entry->id = FLOW_ACTION_ADD;
571 				break;
572 			default:
573 				NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
574 				return -EOPNOTSUPP;
575 			}
576 			entry->mangle.htype = tcf_pedit_htype(act, k);
577 			entry->mangle.mask = tcf_pedit_mask(act, k);
578 			entry->mangle.val = tcf_pedit_val(act, k);
579 			entry->mangle.offset = tcf_pedit_offset(act, k);
580 			entry->hw_stats = tc_act_hw_stats(act->hw_stats);
581 			entry++;
582 		}
583 		*index_inc = k;
584 	} else {
585 		struct flow_offload_action *fl_action = entry_data;
586 		u32 cmd = tcf_pedit_cmd(act, 0);
587 		int k;
588 
589 		switch (cmd) {
590 		case TCA_PEDIT_KEY_EX_CMD_SET:
591 			fl_action->id = FLOW_ACTION_MANGLE;
592 			break;
593 		case TCA_PEDIT_KEY_EX_CMD_ADD:
594 			fl_action->id = FLOW_ACTION_ADD;
595 			break;
596 		default:
597 			NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
598 			return -EOPNOTSUPP;
599 		}
600 
601 		for (k = 1; k < tcf_pedit_nkeys(act); k++) {
602 			if (cmd != tcf_pedit_cmd(act, k)) {
603 				NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
604 				return -EOPNOTSUPP;
605 			}
606 		}
607 	}
608 
609 	return 0;
610 }
611 
612 static struct tc_action_ops act_pedit_ops = {
613 	.kind		=	"pedit",
614 	.id		=	TCA_ID_PEDIT,
615 	.owner		=	THIS_MODULE,
616 	.act		=	tcf_pedit_act,
617 	.stats_update	=	tcf_pedit_stats_update,
618 	.dump		=	tcf_pedit_dump,
619 	.cleanup	=	tcf_pedit_cleanup,
620 	.init		=	tcf_pedit_init,
621 	.offload_act_setup =	tcf_pedit_offload_act_setup,
622 	.size		=	sizeof(struct tcf_pedit),
623 };
624 
625 static __net_init int pedit_init_net(struct net *net)
626 {
627 	struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
628 
629 	return tc_action_net_init(net, tn, &act_pedit_ops);
630 }
631 
632 static void __net_exit pedit_exit_net(struct list_head *net_list)
633 {
634 	tc_action_net_exit(net_list, act_pedit_ops.net_id);
635 }
636 
637 static struct pernet_operations pedit_net_ops = {
638 	.init = pedit_init_net,
639 	.exit_batch = pedit_exit_net,
640 	.id   = &act_pedit_ops.net_id,
641 	.size = sizeof(struct tc_action_net),
642 };
643 
644 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
645 MODULE_DESCRIPTION("Generic Packet Editor actions");
646 MODULE_LICENSE("GPL");
647 
648 static int __init pedit_init_module(void)
649 {
650 	return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
651 }
652 
653 static void __exit pedit_cleanup_module(void)
654 {
655 	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
656 }
657 
658 module_init(pedit_init_module);
659 module_exit(pedit_cleanup_module);
660