mm: filemap: fix mapping->nrpages double accounting in fuse
[cascardo/linux.git] / drivers / net / ipvlan / ipvlan_core.c
1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
2  *
3  * This program is free software; you can redistribute it and/or
4  * modify it under the terms of the GNU General Public License as
5  * published by the Free Software Foundation; either version 2 of
6  * the License, or (at your option) any later version.
7  *
8  */
9
10 #include "ipvlan.h"
11
12 static u32 ipvlan_jhash_secret __read_mostly;
13
14 void ipvlan_init_secret(void)
15 {
16         net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
17 }
18
19 static void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
20                             unsigned int len, bool success, bool mcast)
21 {
22         if (!ipvlan)
23                 return;
24
25         if (likely(success)) {
26                 struct ipvl_pcpu_stats *pcptr;
27
28                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
29                 u64_stats_update_begin(&pcptr->syncp);
30                 pcptr->rx_pkts++;
31                 pcptr->rx_bytes += len;
32                 if (mcast)
33                         pcptr->rx_mcast++;
34                 u64_stats_update_end(&pcptr->syncp);
35         } else {
36                 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
37         }
38 }
39
40 static u8 ipvlan_get_v6_hash(const void *iaddr)
41 {
42         const struct in6_addr *ip6_addr = iaddr;
43
44         return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
45                IPVLAN_HASH_MASK;
46 }
47
48 static u8 ipvlan_get_v4_hash(const void *iaddr)
49 {
50         const struct in_addr *ip4_addr = iaddr;
51
52         return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
53                IPVLAN_HASH_MASK;
54 }
55
56 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
57                                                const void *iaddr, bool is_v6)
58 {
59         struct ipvl_addr *addr;
60         u8 hash;
61
62         hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
63                ipvlan_get_v4_hash(iaddr);
64         hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) {
65                 if (is_v6 && addr->atype == IPVL_IPV6 &&
66                     ipv6_addr_equal(&addr->ip6addr, iaddr))
67                         return addr;
68                 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
69                          addr->ip4addr.s_addr ==
70                                 ((struct in_addr *)iaddr)->s_addr)
71                         return addr;
72         }
73         return NULL;
74 }
75
76 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
77 {
78         struct ipvl_port *port = ipvlan->port;
79         u8 hash;
80
81         hash = (addr->atype == IPVL_IPV6) ?
82                ipvlan_get_v6_hash(&addr->ip6addr) :
83                ipvlan_get_v4_hash(&addr->ip4addr);
84         if (hlist_unhashed(&addr->hlnode))
85                 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
86 }
87
88 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
89 {
90         hlist_del_init_rcu(&addr->hlnode);
91 }
92
93 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
94                                    const void *iaddr, bool is_v6)
95 {
96         struct ipvl_addr *addr;
97
98         list_for_each_entry(addr, &ipvlan->addrs, anode) {
99                 if ((is_v6 && addr->atype == IPVL_IPV6 &&
100                     ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
101                     (!is_v6 && addr->atype == IPVL_IPV4 &&
102                     addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
103                         return addr;
104         }
105         return NULL;
106 }
107
108 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
109 {
110         struct ipvl_dev *ipvlan;
111
112         ASSERT_RTNL();
113
114         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
115                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
116                         return true;
117         }
118         return false;
119 }
120
121 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
122 {
123         void *lyr3h = NULL;
124
125         switch (skb->protocol) {
126         case htons(ETH_P_ARP): {
127                 struct arphdr *arph;
128
129                 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
130                         return NULL;
131
132                 arph = arp_hdr(skb);
133                 *type = IPVL_ARP;
134                 lyr3h = arph;
135                 break;
136         }
137         case htons(ETH_P_IP): {
138                 u32 pktlen;
139                 struct iphdr *ip4h;
140
141                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
142                         return NULL;
143
144                 ip4h = ip_hdr(skb);
145                 pktlen = ntohs(ip4h->tot_len);
146                 if (ip4h->ihl < 5 || ip4h->version != 4)
147                         return NULL;
148                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
149                         return NULL;
150
151                 *type = IPVL_IPV4;
152                 lyr3h = ip4h;
153                 break;
154         }
155         case htons(ETH_P_IPV6): {
156                 struct ipv6hdr *ip6h;
157
158                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
159                         return NULL;
160
161                 ip6h = ipv6_hdr(skb);
162                 if (ip6h->version != 6)
163                         return NULL;
164
165                 *type = IPVL_IPV6;
166                 lyr3h = ip6h;
167                 /* Only Neighbour Solicitation pkts need different treatment */
168                 if (ipv6_addr_any(&ip6h->saddr) &&
169                     ip6h->nexthdr == NEXTHDR_ICMP) {
170                         *type = IPVL_ICMPV6;
171                         lyr3h = ip6h + 1;
172                 }
173                 break;
174         }
175         default:
176                 return NULL;
177         }
178
179         return lyr3h;
180 }
181
182 unsigned int ipvlan_mac_hash(const unsigned char *addr)
183 {
184         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
185                                ipvlan_jhash_secret);
186
187         return hash & IPVLAN_MAC_FILTER_MASK;
188 }
189
190 void ipvlan_process_multicast(struct work_struct *work)
191 {
192         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
193         struct ethhdr *ethh;
194         struct ipvl_dev *ipvlan;
195         struct sk_buff *skb, *nskb;
196         struct sk_buff_head list;
197         unsigned int len;
198         unsigned int mac_hash;
199         int ret;
200         u8 pkt_type;
201         bool hlocal, dlocal;
202
203         __skb_queue_head_init(&list);
204
205         spin_lock_bh(&port->backlog.lock);
206         skb_queue_splice_tail_init(&port->backlog, &list);
207         spin_unlock_bh(&port->backlog.lock);
208
209         while ((skb = __skb_dequeue(&list)) != NULL) {
210                 ethh = eth_hdr(skb);
211                 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
212                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
213
214                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
215                         pkt_type = PACKET_BROADCAST;
216                 else
217                         pkt_type = PACKET_MULTICAST;
218
219                 dlocal = false;
220                 rcu_read_lock();
221                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
222                         if (hlocal && (ipvlan->dev == skb->dev)) {
223                                 dlocal = true;
224                                 continue;
225                         }
226                         if (!test_bit(mac_hash, ipvlan->mac_filters))
227                                 continue;
228
229                         ret = NET_RX_DROP;
230                         len = skb->len + ETH_HLEN;
231                         nskb = skb_clone(skb, GFP_ATOMIC);
232                         if (!nskb)
233                                 goto acct;
234
235                         nskb->pkt_type = pkt_type;
236                         nskb->dev = ipvlan->dev;
237                         if (hlocal)
238                                 ret = dev_forward_skb(ipvlan->dev, nskb);
239                         else
240                                 ret = netif_rx(nskb);
241 acct:
242                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
243                 }
244                 rcu_read_unlock();
245
246                 if (dlocal) {
247                         /* If the packet originated here, send it out. */
248                         skb->dev = port->dev;
249                         skb->pkt_type = pkt_type;
250                         dev_queue_xmit(skb);
251                 } else {
252                         kfree_skb(skb);
253                 }
254         }
255 }
256
257 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
258 {
259         bool xnet = true;
260
261         if (dev)
262                 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
263
264         skb_scrub_packet(skb, xnet);
265         if (dev)
266                 skb->dev = dev;
267 }
268
269 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
270                             bool local)
271 {
272         struct ipvl_dev *ipvlan = addr->master;
273         struct net_device *dev = ipvlan->dev;
274         unsigned int len;
275         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
276         bool success = false;
277         struct sk_buff *skb = *pskb;
278
279         len = skb->len + ETH_HLEN;
280         /* Only packets exchanged between two local slaves need to have
281          * device-up check as well as skb-share check.
282          */
283         if (local) {
284                 if (unlikely(!(dev->flags & IFF_UP))) {
285                         kfree_skb(skb);
286                         goto out;
287                 }
288
289                 skb = skb_share_check(skb, GFP_ATOMIC);
290                 if (!skb)
291                         goto out;
292
293                 *pskb = skb;
294         }
295         ipvlan_skb_crossing_ns(skb, dev);
296
297         if (local) {
298                 skb->pkt_type = PACKET_HOST;
299                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
300                         success = true;
301         } else {
302                 ret = RX_HANDLER_ANOTHER;
303                 success = true;
304         }
305
306 out:
307         ipvlan_count_rx(ipvlan, len, success, false);
308         return ret;
309 }
310
311 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
312                                             void *lyr3h, int addr_type,
313                                             bool use_dest)
314 {
315         struct ipvl_addr *addr = NULL;
316
317         if (addr_type == IPVL_IPV6) {
318                 struct ipv6hdr *ip6h;
319                 struct in6_addr *i6addr;
320
321                 ip6h = (struct ipv6hdr *)lyr3h;
322                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
323                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
324         } else if (addr_type == IPVL_ICMPV6) {
325                 struct nd_msg *ndmh;
326                 struct in6_addr *i6addr;
327
328                 /* Make sure that the NeighborSolicitation ICMPv6 packets
329                  * are handled to avoid DAD issue.
330                  */
331                 ndmh = (struct nd_msg *)lyr3h;
332                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
333                         i6addr = &ndmh->target;
334                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
335                 }
336         } else if (addr_type == IPVL_IPV4) {
337                 struct iphdr *ip4h;
338                 __be32 *i4addr;
339
340                 ip4h = (struct iphdr *)lyr3h;
341                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
342                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
343         } else if (addr_type == IPVL_ARP) {
344                 struct arphdr *arph;
345                 unsigned char *arp_ptr;
346                 __be32 dip;
347
348                 arph = (struct arphdr *)lyr3h;
349                 arp_ptr = (unsigned char *)(arph + 1);
350                 if (use_dest)
351                         arp_ptr += (2 * port->dev->addr_len) + 4;
352                 else
353                         arp_ptr += port->dev->addr_len;
354
355                 memcpy(&dip, arp_ptr, 4);
356                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
357         }
358
359         return addr;
360 }
361
362 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
363 {
364         const struct iphdr *ip4h = ip_hdr(skb);
365         struct net_device *dev = skb->dev;
366         struct net *net = dev_net(dev);
367         struct rtable *rt;
368         int err, ret = NET_XMIT_DROP;
369         struct flowi4 fl4 = {
370                 .flowi4_oif = dev->ifindex,
371                 .flowi4_tos = RT_TOS(ip4h->tos),
372                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
373                 .daddr = ip4h->daddr,
374                 .saddr = ip4h->saddr,
375         };
376
377         rt = ip_route_output_flow(net, &fl4, NULL);
378         if (IS_ERR(rt))
379                 goto err;
380
381         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
382                 ip_rt_put(rt);
383                 goto err;
384         }
385         skb_dst_set(skb, &rt->dst);
386         err = ip_local_out(net, skb->sk, skb);
387         if (unlikely(net_xmit_eval(err)))
388                 dev->stats.tx_errors++;
389         else
390                 ret = NET_XMIT_SUCCESS;
391         goto out;
392 err:
393         dev->stats.tx_errors++;
394         kfree_skb(skb);
395 out:
396         return ret;
397 }
398
399 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
400 {
401         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
402         struct net_device *dev = skb->dev;
403         struct net *net = dev_net(dev);
404         struct dst_entry *dst;
405         int err, ret = NET_XMIT_DROP;
406         struct flowi6 fl6 = {
407                 .flowi6_iif = dev->ifindex,
408                 .daddr = ip6h->daddr,
409                 .saddr = ip6h->saddr,
410                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
411                 .flowlabel = ip6_flowinfo(ip6h),
412                 .flowi6_mark = skb->mark,
413                 .flowi6_proto = ip6h->nexthdr,
414         };
415
416         dst = ip6_route_output(net, NULL, &fl6);
417         if (dst->error) {
418                 ret = dst->error;
419                 dst_release(dst);
420                 goto err;
421         }
422         skb_dst_set(skb, dst);
423         err = ip6_local_out(net, skb->sk, skb);
424         if (unlikely(net_xmit_eval(err)))
425                 dev->stats.tx_errors++;
426         else
427                 ret = NET_XMIT_SUCCESS;
428         goto out;
429 err:
430         dev->stats.tx_errors++;
431         kfree_skb(skb);
432 out:
433         return ret;
434 }
435
436 static int ipvlan_process_outbound(struct sk_buff *skb)
437 {
438         struct ethhdr *ethh = eth_hdr(skb);
439         int ret = NET_XMIT_DROP;
440
441         /* In this mode we dont care about multicast and broadcast traffic */
442         if (is_multicast_ether_addr(ethh->h_dest)) {
443                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
444                                     ntohs(skb->protocol));
445                 kfree_skb(skb);
446                 goto out;
447         }
448
449         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
450          * will have L2; which need to discarded and processed further
451          * in the net-ns of the main-device.
452          */
453         if (skb_mac_header_was_set(skb)) {
454                 skb_pull(skb, sizeof(*ethh));
455                 skb->mac_header = (typeof(skb->mac_header))~0U;
456                 skb_reset_network_header(skb);
457         }
458
459         if (skb->protocol == htons(ETH_P_IPV6))
460                 ret = ipvlan_process_v6_outbound(skb);
461         else if (skb->protocol == htons(ETH_P_IP))
462                 ret = ipvlan_process_v4_outbound(skb);
463         else {
464                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
465                                     ntohs(skb->protocol));
466                 kfree_skb(skb);
467         }
468 out:
469         return ret;
470 }
471
472 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
473                                      struct sk_buff *skb)
474 {
475         if (skb->protocol == htons(ETH_P_PAUSE)) {
476                 kfree_skb(skb);
477                 return;
478         }
479
480         spin_lock(&port->backlog.lock);
481         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
482                 __skb_queue_tail(&port->backlog, skb);
483                 spin_unlock(&port->backlog.lock);
484                 schedule_work(&port->wq);
485         } else {
486                 spin_unlock(&port->backlog.lock);
487                 atomic_long_inc(&skb->dev->rx_dropped);
488                 kfree_skb(skb);
489         }
490 }
491
492 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
493 {
494         const struct ipvl_dev *ipvlan = netdev_priv(dev);
495         void *lyr3h;
496         struct ipvl_addr *addr;
497         int addr_type;
498
499         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
500         if (!lyr3h)
501                 goto out;
502
503         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
504         if (addr)
505                 return ipvlan_rcv_frame(addr, &skb, true);
506
507 out:
508         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
509         return ipvlan_process_outbound(skb);
510 }
511
512 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
513 {
514         const struct ipvl_dev *ipvlan = netdev_priv(dev);
515         struct ethhdr *eth = eth_hdr(skb);
516         struct ipvl_addr *addr;
517         void *lyr3h;
518         int addr_type;
519
520         if (ether_addr_equal(eth->h_dest, eth->h_source)) {
521                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
522                 if (lyr3h) {
523                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
524                         if (addr)
525                                 return ipvlan_rcv_frame(addr, &skb, true);
526                 }
527                 skb = skb_share_check(skb, GFP_ATOMIC);
528                 if (!skb)
529                         return NET_XMIT_DROP;
530
531                 /* Packet definitely does not belong to any of the
532                  * virtual devices, but the dest is local. So forward
533                  * the skb for the main-dev. At the RX side we just return
534                  * RX_PASS for it to be processed further on the stack.
535                  */
536                 return dev_forward_skb(ipvlan->phy_dev, skb);
537
538         } else if (is_multicast_ether_addr(eth->h_dest)) {
539                 ipvlan_skb_crossing_ns(skb, NULL);
540                 ipvlan_multicast_enqueue(ipvlan->port, skb);
541                 return NET_XMIT_SUCCESS;
542         }
543
544         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
545         return dev_queue_xmit(skb);
546 }
547
548 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
549 {
550         struct ipvl_dev *ipvlan = netdev_priv(dev);
551         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
552
553         if (!port)
554                 goto out;
555
556         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
557                 goto out;
558
559         switch(port->mode) {
560         case IPVLAN_MODE_L2:
561                 return ipvlan_xmit_mode_l2(skb, dev);
562         case IPVLAN_MODE_L3:
563                 return ipvlan_xmit_mode_l3(skb, dev);
564         }
565
566         /* Should not reach here */
567         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
568                           port->mode);
569 out:
570         kfree_skb(skb);
571         return NET_XMIT_DROP;
572 }
573
574 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
575 {
576         struct ethhdr *eth = eth_hdr(skb);
577         struct ipvl_addr *addr;
578         void *lyr3h;
579         int addr_type;
580
581         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
582                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
583                 if (!lyr3h)
584                         return true;
585
586                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
587                 if (addr)
588                         return false;
589         }
590
591         return true;
592 }
593
594 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
595                                                  struct ipvl_port *port)
596 {
597         void *lyr3h;
598         int addr_type;
599         struct ipvl_addr *addr;
600         struct sk_buff *skb = *pskb;
601         rx_handler_result_t ret = RX_HANDLER_PASS;
602
603         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
604         if (!lyr3h)
605                 goto out;
606
607         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
608         if (addr)
609                 ret = ipvlan_rcv_frame(addr, pskb, false);
610
611 out:
612         return ret;
613 }
614
615 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
616                                                  struct ipvl_port *port)
617 {
618         struct sk_buff *skb = *pskb;
619         struct ethhdr *eth = eth_hdr(skb);
620         rx_handler_result_t ret = RX_HANDLER_PASS;
621         void *lyr3h;
622         int addr_type;
623
624         if (is_multicast_ether_addr(eth->h_dest)) {
625                 if (ipvlan_external_frame(skb, port)) {
626                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
627
628                         /* External frames are queued for device local
629                          * distribution, but a copy is given to master
630                          * straight away to avoid sending duplicates later
631                          * when work-queue processes this frame. This is
632                          * achieved by returning RX_HANDLER_PASS.
633                          */
634                         if (nskb) {
635                                 ipvlan_skb_crossing_ns(nskb, NULL);
636                                 ipvlan_multicast_enqueue(port, nskb);
637                         }
638                 }
639         } else {
640                 struct ipvl_addr *addr;
641
642                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
643                 if (!lyr3h)
644                         return ret;
645
646                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
647                 if (addr)
648                         ret = ipvlan_rcv_frame(addr, pskb, false);
649         }
650
651         return ret;
652 }
653
654 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
655 {
656         struct sk_buff *skb = *pskb;
657         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
658
659         if (!port)
660                 return RX_HANDLER_PASS;
661
662         switch (port->mode) {
663         case IPVLAN_MODE_L2:
664                 return ipvlan_handle_mode_l2(pskb, port);
665         case IPVLAN_MODE_L3:
666                 return ipvlan_handle_mode_l3(pskb, port);
667         }
668
669         /* Should not reach here */
670         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
671                           port->mode);
672         kfree_skb(skb);
673         return RX_HANDLER_CONSUMED;
674 }