1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/act_mirred.c packet mirroring and redirect actions
4 *
5 * Authors: Jamal Hadi Salim (2002-4)
6 *
7 * TODO: Add ingress support (and socket redirect support)
8 */
9
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
14 #include <linux/skbuff.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/gfp.h>
19 #include <linux/if_arp.h>
20 #include <net/net_namespace.h>
21 #include <net/netlink.h>
22 #include <net/dst.h>
23 #include <net/pkt_sched.h>
24 #include <net/pkt_cls.h>
25 #include <linux/tc_act/tc_mirred.h>
26 #include <net/tc_act/tc_mirred.h>
27 #include <net/tc_wrapper.h>
28
29 #define MIRRED_DEFER_LIMIT 3
30 _Static_assert(MIRRED_DEFER_LIMIT <= 3,
31 "MIRRED_DEFER_LIMIT exceeds tc_depth bitfield width");
32
33 static LIST_HEAD(mirred_list);
34 static DEFINE_SPINLOCK(mirred_list_lock);
35
tcf_mirred_is_act_redirect(int action)36 static bool tcf_mirred_is_act_redirect(int action)
37 {
38 return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
39 }
40
tcf_mirred_act_wants_ingress(int action)41 static bool tcf_mirred_act_wants_ingress(int action)
42 {
43 switch (action) {
44 case TCA_EGRESS_REDIR:
45 case TCA_EGRESS_MIRROR:
46 return false;
47 case TCA_INGRESS_REDIR:
48 case TCA_INGRESS_MIRROR:
49 return true;
50 default:
51 BUG();
52 }
53 }
54
tcf_mirred_can_reinsert(int action)55 static bool tcf_mirred_can_reinsert(int action)
56 {
57 switch (action) {
58 case TC_ACT_SHOT:
59 case TC_ACT_STOLEN:
60 case TC_ACT_QUEUED:
61 case TC_ACT_TRAP:
62 return true;
63 }
64 return false;
65 }
66
tcf_mirred_dev_dereference(struct tcf_mirred * m)67 static struct net_device *tcf_mirred_dev_dereference(struct tcf_mirred *m)
68 {
69 return rcu_dereference_protected(m->tcfm_dev,
70 lockdep_is_held(&m->tcf_lock));
71 }
72
tcf_mirred_release(struct tc_action * a)73 static void tcf_mirred_release(struct tc_action *a)
74 {
75 struct tcf_mirred *m = to_mirred(a);
76 struct net_device *dev;
77
78 spin_lock(&mirred_list_lock);
79 list_del(&m->tcfm_list);
80 spin_unlock(&mirred_list_lock);
81
82 /* last reference to action, no need to lock */
83 dev = rcu_dereference_protected(m->tcfm_dev, 1);
84 netdev_put(dev, &m->tcfm_dev_tracker);
85 }
86
87 static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
88 [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
89 [TCA_MIRRED_BLOCKID] = NLA_POLICY_MIN(NLA_U32, 1),
90 };
91
92 static struct tc_action_ops act_mirred_ops;
93
tcf_mirred_replace_dev(struct tcf_mirred * m,struct net_device * ndev)94 static void tcf_mirred_replace_dev(struct tcf_mirred *m,
95 struct net_device *ndev)
96 {
97 struct net_device *odev;
98
99 odev = rcu_replace_pointer(m->tcfm_dev, ndev,
100 lockdep_is_held(&m->tcf_lock));
101 netdev_put(odev, &m->tcfm_dev_tracker);
102 }
103
tcf_mirred_init(struct net * net,struct nlattr * nla,struct nlattr * est,struct tc_action ** a,struct tcf_proto * tp,u32 flags,struct netlink_ext_ack * extack)104 static int tcf_mirred_init(struct net *net, struct nlattr *nla,
105 struct nlattr *est, struct tc_action **a,
106 struct tcf_proto *tp,
107 u32 flags, struct netlink_ext_ack *extack)
108 {
109 struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
110 bool bind = flags & TCA_ACT_FLAGS_BIND;
111 struct nlattr *tb[TCA_MIRRED_MAX + 1];
112 struct tcf_chain *goto_ch = NULL;
113 bool mac_header_xmit = false;
114 struct tc_mirred *parm;
115 struct tcf_mirred *m;
116 bool exists = false;
117 int ret, err;
118 u32 index;
119
120 if (!nla) {
121 NL_SET_ERR_MSG_MOD(extack, "Mirred requires attributes to be passed");
122 return -EINVAL;
123 }
124 ret = nla_parse_nested_deprecated(tb, TCA_MIRRED_MAX, nla,
125 mirred_policy, extack);
126 if (ret < 0)
127 return ret;
128 if (!tb[TCA_MIRRED_PARMS]) {
129 NL_SET_ERR_MSG_MOD(extack, "Missing required mirred parameters");
130 return -EINVAL;
131 }
132 parm = nla_data(tb[TCA_MIRRED_PARMS]);
133 index = parm->index;
134 err = tcf_idr_check_alloc(tn, &index, a, bind);
135 if (err < 0)
136 return err;
137 exists = err;
138 if (exists && bind)
139 return ACT_P_BOUND;
140
141 if (tb[TCA_MIRRED_BLOCKID] && parm->ifindex) {
142 NL_SET_ERR_MSG_MOD(extack,
143 "Cannot specify Block ID and dev simultaneously");
144 if (exists)
145 tcf_idr_release(*a, bind);
146 else
147 tcf_idr_cleanup(tn, index);
148
149 return -EINVAL;
150 }
151
152 switch (parm->eaction) {
153 case TCA_EGRESS_MIRROR:
154 case TCA_EGRESS_REDIR:
155 case TCA_INGRESS_REDIR:
156 case TCA_INGRESS_MIRROR:
157 break;
158 default:
159 if (exists)
160 tcf_idr_release(*a, bind);
161 else
162 tcf_idr_cleanup(tn, index);
163 NL_SET_ERR_MSG_MOD(extack, "Unknown mirred option");
164 return -EINVAL;
165 }
166
167 if (!exists) {
168 if (!parm->ifindex && !tb[TCA_MIRRED_BLOCKID]) {
169 tcf_idr_cleanup(tn, index);
170 NL_SET_ERR_MSG_MOD(extack,
171 "Must specify device or block");
172 return -EINVAL;
173 }
174 ret = tcf_idr_create_from_flags(tn, index, est, a,
175 &act_mirred_ops, bind, flags);
176 if (ret) {
177 tcf_idr_cleanup(tn, index);
178 return ret;
179 }
180 ret = ACT_P_CREATED;
181 } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
182 tcf_idr_release(*a, bind);
183 return -EEXIST;
184 }
185
186 m = to_mirred(*a);
187 if (ret == ACT_P_CREATED)
188 INIT_LIST_HEAD(&m->tcfm_list);
189
190 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
191 if (err < 0)
192 goto release_idr;
193
194 spin_lock_bh(&m->tcf_lock);
195
196 if (parm->ifindex) {
197 struct net_device *ndev;
198
199 ndev = dev_get_by_index(net, parm->ifindex);
200 if (!ndev) {
201 spin_unlock_bh(&m->tcf_lock);
202 err = -ENODEV;
203 goto put_chain;
204 }
205 mac_header_xmit = dev_is_mac_header_xmit(ndev);
206 tcf_mirred_replace_dev(m, ndev);
207 netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
208 m->tcfm_mac_header_xmit = mac_header_xmit;
209 m->tcfm_blockid = 0;
210 } else if (tb[TCA_MIRRED_BLOCKID]) {
211 tcf_mirred_replace_dev(m, NULL);
212 m->tcfm_mac_header_xmit = false;
213 m->tcfm_blockid = nla_get_u32(tb[TCA_MIRRED_BLOCKID]);
214 }
215 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
216 m->tcfm_eaction = parm->eaction;
217 spin_unlock_bh(&m->tcf_lock);
218 if (goto_ch)
219 tcf_chain_put_by_act(goto_ch);
220
221 if (ret == ACT_P_CREATED) {
222 spin_lock(&mirred_list_lock);
223 list_add(&m->tcfm_list, &mirred_list);
224 spin_unlock(&mirred_list_lock);
225 }
226
227 return ret;
228 put_chain:
229 if (goto_ch)
230 tcf_chain_put_by_act(goto_ch);
231 release_idr:
232 tcf_idr_release(*a, bind);
233 return err;
234 }
235
236 static int
tcf_mirred_forward(bool at_ingress,bool want_ingress,struct sk_buff * skb)237 tcf_mirred_forward(bool at_ingress, bool want_ingress, struct sk_buff *skb)
238 {
239 int err;
240
241 if (!want_ingress) {
242 err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
243 } else {
244 skb->tc_depth++;
245 if (!at_ingress)
246 err = netif_rx(skb);
247 else
248 err = netif_receive_skb(skb);
249 }
250
251 return err;
252 }
253
tcf_mirred_to_dev(struct sk_buff * skb,struct tcf_mirred * m,struct net_device * dev,const bool m_mac_header_xmit,int m_eaction,int retval)254 static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
255 struct net_device *dev,
256 const bool m_mac_header_xmit, int m_eaction,
257 int retval)
258 {
259 struct sk_buff *skb_to_send = skb;
260 bool want_ingress;
261 bool is_redirect;
262 bool expects_nh;
263 bool at_ingress;
264 bool dont_clone;
265 int mac_len;
266 bool at_nh;
267 int err;
268
269 is_redirect = tcf_mirred_is_act_redirect(m_eaction);
270 if (unlikely(!(dev->flags & IFF_UP)) || !netif_carrier_ok(dev)) {
271 net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
272 dev->name);
273 goto err_cant_do;
274 }
275
276 want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
277
278 at_ingress = skb_at_tc_ingress(skb);
279 if (dev == skb->dev && want_ingress == at_ingress) {
280 pr_notice_once("tc mirred: Loop (%s:%s --> %s:%s)\n",
281 netdev_name(skb->dev),
282 at_ingress ? "ingress" : "egress",
283 netdev_name(dev),
284 want_ingress ? "ingress" : "egress");
285 goto err_cant_do;
286 }
287
288 /* we could easily avoid the clone only if called by ingress and clsact;
289 * since we can't easily detect the clsact caller, skip clone only for
290 * ingress - that covers the TC S/W datapath.
291 */
292 dont_clone = skb_at_tc_ingress(skb) && is_redirect &&
293 tcf_mirred_can_reinsert(retval);
294 if (!dont_clone) {
295 skb_to_send = skb_clone(skb, GFP_ATOMIC);
296 if (!skb_to_send)
297 goto err_cant_do;
298 }
299
300 /* All mirred/redirected skbs should clear previous ct info */
301 nf_reset_ct(skb_to_send);
302 if (want_ingress && !at_ingress) /* drop dst for egress -> ingress */
303 skb_dst_drop(skb_to_send);
304
305 expects_nh = want_ingress || !m_mac_header_xmit;
306 at_nh = skb->data == skb_network_header(skb);
307 if (at_nh != expects_nh) {
308 mac_len = at_ingress ? skb->mac_len :
309 skb_network_offset(skb);
310 if (expects_nh) {
311 /* target device/action expect data at nh */
312 skb_pull_rcsum(skb_to_send, mac_len);
313 } else {
314 /* target device/action expect data at mac */
315 skb_push_rcsum(skb_to_send, mac_len);
316 }
317 }
318
319 skb_to_send->skb_iif = skb->dev->ifindex;
320 skb_to_send->dev = dev;
321
322 if (is_redirect) {
323 if (skb == skb_to_send)
324 retval = TC_ACT_CONSUMED;
325
326 skb_set_redirected(skb_to_send, skb_to_send->tc_at_ingress);
327
328 err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
329 } else {
330 err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
331 }
332 if (err)
333 tcf_action_inc_overlimit_qstats(&m->common);
334
335 return retval;
336
337 err_cant_do:
338 if (is_redirect)
339 retval = TC_ACT_SHOT;
340 tcf_action_inc_overlimit_qstats(&m->common);
341 return retval;
342 }
343
tcf_blockcast_redir(struct sk_buff * skb,struct tcf_mirred * m,struct tcf_block * block,int m_eaction,const u32 exception_ifindex,int retval)344 static int tcf_blockcast_redir(struct sk_buff *skb, struct tcf_mirred *m,
345 struct tcf_block *block, int m_eaction,
346 const u32 exception_ifindex, int retval)
347 {
348 struct net_device *dev_prev = NULL;
349 struct net_device *dev = NULL;
350 unsigned long index;
351 int mirred_eaction;
352
353 mirred_eaction = tcf_mirred_act_wants_ingress(m_eaction) ?
354 TCA_INGRESS_MIRROR : TCA_EGRESS_MIRROR;
355
356 xa_for_each(&block->ports, index, dev) {
357 if (index == exception_ifindex)
358 continue;
359
360 if (!dev_prev)
361 goto assign_prev;
362
363 tcf_mirred_to_dev(skb, m, dev_prev,
364 dev_is_mac_header_xmit(dev_prev),
365 mirred_eaction, retval);
366 assign_prev:
367 dev_prev = dev;
368 }
369
370 if (dev_prev)
371 return tcf_mirred_to_dev(skb, m, dev_prev,
372 dev_is_mac_header_xmit(dev_prev),
373 m_eaction, retval);
374
375 /* If the packet wasn't redirected, we have to register as a drop */
376 return TC_ACT_SHOT;
377 }
378
tcf_blockcast_mirror(struct sk_buff * skb,struct tcf_mirred * m,struct tcf_block * block,int m_eaction,const u32 exception_ifindex,int retval)379 static int tcf_blockcast_mirror(struct sk_buff *skb, struct tcf_mirred *m,
380 struct tcf_block *block, int m_eaction,
381 const u32 exception_ifindex, int retval)
382 {
383 struct net_device *dev = NULL;
384 unsigned long index;
385
386 xa_for_each(&block->ports, index, dev) {
387 if (index == exception_ifindex)
388 continue;
389
390 tcf_mirred_to_dev(skb, m, dev,
391 dev_is_mac_header_xmit(dev),
392 m_eaction, retval);
393 }
394
395 return retval;
396 }
397
tcf_blockcast(struct sk_buff * skb,struct tcf_mirred * m,const u32 blockid,struct tcf_result * res,int m_eaction,int retval)398 static int tcf_blockcast(struct sk_buff *skb, struct tcf_mirred *m,
399 const u32 blockid, struct tcf_result *res,
400 int m_eaction, int retval)
401 {
402 const u32 exception_ifindex = skb->dev->ifindex;
403 struct tcf_block *block;
404 bool is_redirect;
405
406 is_redirect = tcf_mirred_is_act_redirect(m_eaction);
407
408 /* we are already under rcu protection, so can call block lookup
409 * directly.
410 */
411 block = tcf_block_lookup(dev_net(skb->dev), blockid);
412 if (!block || xa_empty(&block->ports)) {
413 tcf_action_inc_overlimit_qstats(&m->common);
414 return is_redirect ? TC_ACT_SHOT : retval;
415 }
416
417 if (is_redirect)
418 return tcf_blockcast_redir(skb, m, block, m_eaction,
419 exception_ifindex, retval);
420
421 /* If it's not redirect, it is mirror */
422 return tcf_blockcast_mirror(skb, m, block, m_eaction, exception_ifindex,
423 retval);
424 }
425
tcf_mirred_act(struct sk_buff * skb,const struct tc_action * a,struct tcf_result * res)426 TC_INDIRECT_SCOPE int tcf_mirred_act(struct sk_buff *skb,
427 const struct tc_action *a,
428 struct tcf_result *res)
429 {
430 struct tcf_mirred *m = to_mirred(a);
431 int retval = READ_ONCE(m->tcf_action);
432 bool m_mac_header_xmit, is_redirect;
433 struct netdev_xmit *xmit;
434 struct net_device *dev;
435 bool want_ingress;
436 int i, m_eaction;
437 u32 blockid;
438
439 #ifdef CONFIG_PREEMPT_RT
440 xmit = ¤t->net_xmit;
441 #else
442 xmit = this_cpu_ptr(&softnet_data.xmit);
443 #endif
444 if (unlikely(xmit->sched_mirred_nest >= MIRRED_NEST_LIMIT ||
445 skb->tc_depth >= MIRRED_DEFER_LIMIT)) {
446 net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
447 netdev_name(skb->dev));
448 return TC_ACT_SHOT;
449 }
450
451 tcf_lastuse_update(&m->tcf_tm);
452 tcf_action_update_bstats(&m->common, skb);
453
454 blockid = READ_ONCE(m->tcfm_blockid);
455 m_eaction = READ_ONCE(m->tcfm_eaction);
456 want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
457 if (blockid) {
458 if (!want_ingress)
459 xmit->sched_mirred_dev[xmit->sched_mirred_nest++] = NULL;
460 retval = tcf_blockcast(skb, m, blockid, res, m_eaction, retval);
461 if (!want_ingress)
462 xmit->sched_mirred_nest--;
463 return retval;
464 }
465
466 is_redirect = tcf_mirred_is_act_redirect(m_eaction);
467
468 dev = rcu_dereference_bh(m->tcfm_dev);
469 if (unlikely(!dev)) {
470 pr_notice_once("tc mirred: target device is gone\n");
471 tcf_action_inc_overlimit_qstats(&m->common);
472 goto err_out;
473 }
474
475 if (!want_ingress) {
476 for (i = 0; i < xmit->sched_mirred_nest; i++) {
477 if (xmit->sched_mirred_dev[i] != dev)
478 continue;
479 pr_notice_once("tc mirred: loop on device %s\n",
480 netdev_name(dev));
481 tcf_action_inc_overlimit_qstats(&m->common);
482 goto err_out;
483 }
484 xmit->sched_mirred_dev[xmit->sched_mirred_nest++] = dev;
485 }
486
487 m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
488
489 retval = tcf_mirred_to_dev(skb, m, dev, m_mac_header_xmit, m_eaction,
490 retval);
491 if (!want_ingress)
492 xmit->sched_mirred_nest--;
493
494 return retval;
495
496 err_out:
497 if (is_redirect)
498 retval = TC_ACT_SHOT;
499 return retval;
500 }
501
tcf_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 drops,u64 lastuse,bool hw)502 static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
503 u64 drops, u64 lastuse, bool hw)
504 {
505 struct tcf_mirred *m = to_mirred(a);
506 struct tcf_t *tm = &m->tcf_tm;
507
508 tcf_action_update_stats(a, bytes, packets, drops, hw);
509 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
510 }
511
tcf_mirred_dump(struct sk_buff * skb,struct tc_action * a,int bind,int ref)512 static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,
513 int ref)
514 {
515 unsigned char *b = skb_tail_pointer(skb);
516 struct tcf_mirred *m = to_mirred(a);
517 struct tc_mirred opt = {
518 .index = m->tcf_index,
519 .refcnt = refcount_read(&m->tcf_refcnt) - ref,
520 .bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
521 };
522 struct net_device *dev;
523 struct tcf_t t;
524 u32 blockid;
525
526 spin_lock_bh(&m->tcf_lock);
527 opt.action = m->tcf_action;
528 opt.eaction = m->tcfm_eaction;
529 dev = tcf_mirred_dev_dereference(m);
530 if (dev)
531 opt.ifindex = dev->ifindex;
532
533 if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
534 goto nla_put_failure;
535
536 blockid = m->tcfm_blockid;
537 if (blockid && nla_put_u32(skb, TCA_MIRRED_BLOCKID, blockid))
538 goto nla_put_failure;
539
540 tcf_tm_dump(&t, &m->tcf_tm);
541 if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD))
542 goto nla_put_failure;
543 spin_unlock_bh(&m->tcf_lock);
544
545 return skb->len;
546
547 nla_put_failure:
548 spin_unlock_bh(&m->tcf_lock);
549 nlmsg_trim(skb, b);
550 return -1;
551 }
552
mirred_device_event(struct notifier_block * unused,unsigned long event,void * ptr)553 static int mirred_device_event(struct notifier_block *unused,
554 unsigned long event, void *ptr)
555 {
556 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
557 struct tcf_mirred *m;
558
559 ASSERT_RTNL();
560 if (event == NETDEV_UNREGISTER) {
561 spin_lock(&mirred_list_lock);
562 list_for_each_entry(m, &mirred_list, tcfm_list) {
563 spin_lock_bh(&m->tcf_lock);
564 if (tcf_mirred_dev_dereference(m) == dev) {
565 netdev_put(dev, &m->tcfm_dev_tracker);
566 /* Note : no rcu grace period necessary, as
567 * net_device are already rcu protected.
568 */
569 RCU_INIT_POINTER(m->tcfm_dev, NULL);
570 }
571 spin_unlock_bh(&m->tcf_lock);
572 }
573 spin_unlock(&mirred_list_lock);
574 }
575
576 return NOTIFY_DONE;
577 }
578
579 static struct notifier_block mirred_device_notifier = {
580 .notifier_call = mirred_device_event,
581 };
582
tcf_mirred_dev_put(void * priv)583 static void tcf_mirred_dev_put(void *priv)
584 {
585 struct net_device *dev = priv;
586
587 dev_put(dev);
588 }
589
590 static struct net_device *
tcf_mirred_get_dev(const struct tc_action * a,tc_action_priv_destructor * destructor)591 tcf_mirred_get_dev(const struct tc_action *a,
592 tc_action_priv_destructor *destructor)
593 {
594 struct tcf_mirred *m = to_mirred(a);
595 struct net_device *dev;
596
597 rcu_read_lock();
598 dev = rcu_dereference(m->tcfm_dev);
599 if (dev) {
600 dev_hold(dev);
601 *destructor = tcf_mirred_dev_put;
602 }
603 rcu_read_unlock();
604
605 return dev;
606 }
607
tcf_mirred_get_fill_size(const struct tc_action * act)608 static size_t tcf_mirred_get_fill_size(const struct tc_action *act)
609 {
610 return nla_total_size(sizeof(struct tc_mirred));
611 }
612
tcf_offload_mirred_get_dev(struct flow_action_entry * entry,const struct tc_action * act)613 static void tcf_offload_mirred_get_dev(struct flow_action_entry *entry,
614 const struct tc_action *act)
615 {
616 entry->dev = act->ops->get_dev(act, &entry->destructor);
617 if (!entry->dev)
618 return;
619 entry->destructor_priv = entry->dev;
620 }
621
tcf_mirred_offload_act_setup(struct tc_action * act,void * entry_data,u32 * index_inc,bool bind,struct netlink_ext_ack * extack)622 static int tcf_mirred_offload_act_setup(struct tc_action *act, void *entry_data,
623 u32 *index_inc, bool bind,
624 struct netlink_ext_ack *extack)
625 {
626 if (bind) {
627 struct flow_action_entry *entry = entry_data;
628
629 if (is_tcf_mirred_egress_redirect(act)) {
630 entry->id = FLOW_ACTION_REDIRECT;
631 tcf_offload_mirred_get_dev(entry, act);
632 } else if (is_tcf_mirred_egress_mirror(act)) {
633 entry->id = FLOW_ACTION_MIRRED;
634 tcf_offload_mirred_get_dev(entry, act);
635 } else if (is_tcf_mirred_ingress_redirect(act)) {
636 entry->id = FLOW_ACTION_REDIRECT_INGRESS;
637 tcf_offload_mirred_get_dev(entry, act);
638 } else if (is_tcf_mirred_ingress_mirror(act)) {
639 entry->id = FLOW_ACTION_MIRRED_INGRESS;
640 tcf_offload_mirred_get_dev(entry, act);
641 } else {
642 NL_SET_ERR_MSG_MOD(extack, "Unsupported mirred offload");
643 return -EOPNOTSUPP;
644 }
645 *index_inc = 1;
646 } else {
647 struct flow_offload_action *fl_action = entry_data;
648
649 if (is_tcf_mirred_egress_redirect(act))
650 fl_action->id = FLOW_ACTION_REDIRECT;
651 else if (is_tcf_mirred_egress_mirror(act))
652 fl_action->id = FLOW_ACTION_MIRRED;
653 else if (is_tcf_mirred_ingress_redirect(act))
654 fl_action->id = FLOW_ACTION_REDIRECT_INGRESS;
655 else if (is_tcf_mirred_ingress_mirror(act))
656 fl_action->id = FLOW_ACTION_MIRRED_INGRESS;
657 else
658 return -EOPNOTSUPP;
659 }
660
661 return 0;
662 }
663
664 static struct tc_action_ops act_mirred_ops = {
665 .kind = "mirred",
666 .id = TCA_ID_MIRRED,
667 .owner = THIS_MODULE,
668 .act = tcf_mirred_act,
669 .stats_update = tcf_stats_update,
670 .dump = tcf_mirred_dump,
671 .cleanup = tcf_mirred_release,
672 .init = tcf_mirred_init,
673 .get_fill_size = tcf_mirred_get_fill_size,
674 .offload_act_setup = tcf_mirred_offload_act_setup,
675 .size = sizeof(struct tcf_mirred),
676 .get_dev = tcf_mirred_get_dev,
677 };
678 MODULE_ALIAS_NET_ACT("mirred");
679
mirred_init_net(struct net * net)680 static __net_init int mirred_init_net(struct net *net)
681 {
682 struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
683
684 return tc_action_net_init(net, tn, &act_mirred_ops);
685 }
686
mirred_exit_net(struct list_head * net_list)687 static void __net_exit mirred_exit_net(struct list_head *net_list)
688 {
689 tc_action_net_exit(net_list, act_mirred_ops.net_id);
690 }
691
692 static struct pernet_operations mirred_net_ops = {
693 .init = mirred_init_net,
694 .exit_batch = mirred_exit_net,
695 .id = &act_mirred_ops.net_id,
696 .size = sizeof(struct tc_action_net),
697 };
698
699 MODULE_AUTHOR("Jamal Hadi Salim(2002)");
700 MODULE_DESCRIPTION("Device Mirror/redirect actions");
701 MODULE_LICENSE("GPL");
702
mirred_init_module(void)703 static int __init mirred_init_module(void)
704 {
705 int err = register_netdevice_notifier(&mirred_device_notifier);
706 if (err)
707 return err;
708
709 pr_info("Mirror/redirect action on\n");
710 err = tcf_register_action(&act_mirred_ops, &mirred_net_ops);
711 if (err)
712 unregister_netdevice_notifier(&mirred_device_notifier);
713
714 return err;
715 }
716
mirred_cleanup_module(void)717 static void __exit mirred_cleanup_module(void)
718 {
719 tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
720 unregister_netdevice_notifier(&mirred_device_notifier);
721 }
722
723 module_init(mirred_init_module);
724 module_exit(mirred_cleanup_module);
725