geneve: only configure or fill UDP_ZERO_CSUM6_RX/TX info when CONFIG_IPV6
[sfrench/cifs-2.6.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 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
20                             unsigned int len, bool success, bool mcast)
21 {
22         if (likely(success)) {
23                 struct ipvl_pcpu_stats *pcptr;
24
25                 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
26                 u64_stats_update_begin(&pcptr->syncp);
27                 pcptr->rx_pkts++;
28                 pcptr->rx_bytes += len;
29                 if (mcast)
30                         pcptr->rx_mcast++;
31                 u64_stats_update_end(&pcptr->syncp);
32         } else {
33                 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
34         }
35 }
36 EXPORT_SYMBOL_GPL(ipvlan_count_rx);
37
38 static u8 ipvlan_get_v6_hash(const void *iaddr)
39 {
40         const struct in6_addr *ip6_addr = iaddr;
41
42         return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
43                IPVLAN_HASH_MASK;
44 }
45
46 static u8 ipvlan_get_v4_hash(const void *iaddr)
47 {
48         const struct in_addr *ip4_addr = iaddr;
49
50         return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
51                IPVLAN_HASH_MASK;
52 }
53
54 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
55                                                const void *iaddr, bool is_v6)
56 {
57         struct ipvl_addr *addr;
58         u8 hash;
59
60         hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
61                ipvlan_get_v4_hash(iaddr);
62         hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) {
63                 if (is_v6 && addr->atype == IPVL_IPV6 &&
64                     ipv6_addr_equal(&addr->ip6addr, iaddr))
65                         return addr;
66                 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
67                          addr->ip4addr.s_addr ==
68                                 ((struct in_addr *)iaddr)->s_addr)
69                         return addr;
70         }
71         return NULL;
72 }
73
74 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
75 {
76         struct ipvl_port *port = ipvlan->port;
77         u8 hash;
78
79         hash = (addr->atype == IPVL_IPV6) ?
80                ipvlan_get_v6_hash(&addr->ip6addr) :
81                ipvlan_get_v4_hash(&addr->ip4addr);
82         if (hlist_unhashed(&addr->hlnode))
83                 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
84 }
85
86 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
87 {
88         hlist_del_init_rcu(&addr->hlnode);
89 }
90
91 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
92                                    const void *iaddr, bool is_v6)
93 {
94         struct ipvl_addr *addr;
95
96         list_for_each_entry(addr, &ipvlan->addrs, anode) {
97                 if ((is_v6 && addr->atype == IPVL_IPV6 &&
98                     ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
99                     (!is_v6 && addr->atype == IPVL_IPV4 &&
100                     addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
101                         return addr;
102         }
103         return NULL;
104 }
105
106 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
107 {
108         struct ipvl_dev *ipvlan;
109
110         ASSERT_RTNL();
111
112         list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
113                 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
114                         return true;
115         }
116         return false;
117 }
118
119 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
120 {
121         void *lyr3h = NULL;
122
123         switch (skb->protocol) {
124         case htons(ETH_P_ARP): {
125                 struct arphdr *arph;
126
127                 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
128                         return NULL;
129
130                 arph = arp_hdr(skb);
131                 *type = IPVL_ARP;
132                 lyr3h = arph;
133                 break;
134         }
135         case htons(ETH_P_IP): {
136                 u32 pktlen;
137                 struct iphdr *ip4h;
138
139                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
140                         return NULL;
141
142                 ip4h = ip_hdr(skb);
143                 pktlen = ntohs(ip4h->tot_len);
144                 if (ip4h->ihl < 5 || ip4h->version != 4)
145                         return NULL;
146                 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
147                         return NULL;
148
149                 *type = IPVL_IPV4;
150                 lyr3h = ip4h;
151                 break;
152         }
153         case htons(ETH_P_IPV6): {
154                 struct ipv6hdr *ip6h;
155
156                 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
157                         return NULL;
158
159                 ip6h = ipv6_hdr(skb);
160                 if (ip6h->version != 6)
161                         return NULL;
162
163                 *type = IPVL_IPV6;
164                 lyr3h = ip6h;
165                 /* Only Neighbour Solicitation pkts need different treatment */
166                 if (ipv6_addr_any(&ip6h->saddr) &&
167                     ip6h->nexthdr == NEXTHDR_ICMP) {
168                         *type = IPVL_ICMPV6;
169                         lyr3h = ip6h + 1;
170                 }
171                 break;
172         }
173         default:
174                 return NULL;
175         }
176
177         return lyr3h;
178 }
179
180 unsigned int ipvlan_mac_hash(const unsigned char *addr)
181 {
182         u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
183                                ipvlan_jhash_secret);
184
185         return hash & IPVLAN_MAC_FILTER_MASK;
186 }
187
188 void ipvlan_process_multicast(struct work_struct *work)
189 {
190         struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
191         struct ethhdr *ethh;
192         struct ipvl_dev *ipvlan;
193         struct sk_buff *skb, *nskb;
194         struct sk_buff_head list;
195         unsigned int len;
196         unsigned int mac_hash;
197         int ret;
198         u8 pkt_type;
199         bool tx_pkt;
200
201         __skb_queue_head_init(&list);
202
203         spin_lock_bh(&port->backlog.lock);
204         skb_queue_splice_tail_init(&port->backlog, &list);
205         spin_unlock_bh(&port->backlog.lock);
206
207         while ((skb = __skb_dequeue(&list)) != NULL) {
208                 struct net_device *dev = skb->dev;
209                 bool consumed = false;
210
211                 ethh = eth_hdr(skb);
212                 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
213                 mac_hash = ipvlan_mac_hash(ethh->h_dest);
214
215                 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
216                         pkt_type = PACKET_BROADCAST;
217                 else
218                         pkt_type = PACKET_MULTICAST;
219
220                 rcu_read_lock();
221                 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
222                         if (tx_pkt && (ipvlan->dev == skb->dev))
223                                 continue;
224                         if (!test_bit(mac_hash, ipvlan->mac_filters))
225                                 continue;
226                         if (!(ipvlan->dev->flags & IFF_UP))
227                                 continue;
228                         ret = NET_RX_DROP;
229                         len = skb->len + ETH_HLEN;
230                         nskb = skb_clone(skb, GFP_ATOMIC);
231                         local_bh_disable();
232                         if (nskb) {
233                                 consumed = true;
234                                 nskb->pkt_type = pkt_type;
235                                 nskb->dev = ipvlan->dev;
236                                 if (tx_pkt)
237                                         ret = dev_forward_skb(ipvlan->dev, nskb);
238                                 else
239                                         ret = netif_rx(nskb);
240                         }
241                         ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
242                         local_bh_enable();
243                 }
244                 rcu_read_unlock();
245
246                 if (tx_pkt) {
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                         if (consumed)
253                                 consume_skb(skb);
254                         else
255                                 kfree_skb(skb);
256                 }
257                 if (dev)
258                         dev_put(dev);
259         }
260 }
261
262 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
263 {
264         bool xnet = true;
265
266         if (dev)
267                 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
268
269         skb_scrub_packet(skb, xnet);
270         if (dev)
271                 skb->dev = dev;
272 }
273
274 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
275                             bool local)
276 {
277         struct ipvl_dev *ipvlan = addr->master;
278         struct net_device *dev = ipvlan->dev;
279         unsigned int len;
280         rx_handler_result_t ret = RX_HANDLER_CONSUMED;
281         bool success = false;
282         struct sk_buff *skb = *pskb;
283
284         len = skb->len + ETH_HLEN;
285         /* Only packets exchanged between two local slaves need to have
286          * device-up check as well as skb-share check.
287          */
288         if (local) {
289                 if (unlikely(!(dev->flags & IFF_UP))) {
290                         kfree_skb(skb);
291                         goto out;
292                 }
293
294                 skb = skb_share_check(skb, GFP_ATOMIC);
295                 if (!skb)
296                         goto out;
297
298                 *pskb = skb;
299         }
300         ipvlan_skb_crossing_ns(skb, dev);
301
302         if (local) {
303                 skb->pkt_type = PACKET_HOST;
304                 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
305                         success = true;
306         } else {
307                 ret = RX_HANDLER_ANOTHER;
308                 success = true;
309         }
310
311 out:
312         ipvlan_count_rx(ipvlan, len, success, false);
313         return ret;
314 }
315
316 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
317                                             void *lyr3h, int addr_type,
318                                             bool use_dest)
319 {
320         struct ipvl_addr *addr = NULL;
321
322         if (addr_type == IPVL_IPV6) {
323                 struct ipv6hdr *ip6h;
324                 struct in6_addr *i6addr;
325
326                 ip6h = (struct ipv6hdr *)lyr3h;
327                 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
328                 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
329         } else if (addr_type == IPVL_ICMPV6) {
330                 struct nd_msg *ndmh;
331                 struct in6_addr *i6addr;
332
333                 /* Make sure that the NeighborSolicitation ICMPv6 packets
334                  * are handled to avoid DAD issue.
335                  */
336                 ndmh = (struct nd_msg *)lyr3h;
337                 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
338                         i6addr = &ndmh->target;
339                         addr = ipvlan_ht_addr_lookup(port, i6addr, true);
340                 }
341         } else if (addr_type == IPVL_IPV4) {
342                 struct iphdr *ip4h;
343                 __be32 *i4addr;
344
345                 ip4h = (struct iphdr *)lyr3h;
346                 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
347                 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
348         } else if (addr_type == IPVL_ARP) {
349                 struct arphdr *arph;
350                 unsigned char *arp_ptr;
351                 __be32 dip;
352
353                 arph = (struct arphdr *)lyr3h;
354                 arp_ptr = (unsigned char *)(arph + 1);
355                 if (use_dest)
356                         arp_ptr += (2 * port->dev->addr_len) + 4;
357                 else
358                         arp_ptr += port->dev->addr_len;
359
360                 memcpy(&dip, arp_ptr, 4);
361                 addr = ipvlan_ht_addr_lookup(port, &dip, false);
362         }
363
364         return addr;
365 }
366
367 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
368 {
369         const struct iphdr *ip4h = ip_hdr(skb);
370         struct net_device *dev = skb->dev;
371         struct net *net = dev_net(dev);
372         struct rtable *rt;
373         int err, ret = NET_XMIT_DROP;
374         struct flowi4 fl4 = {
375                 .flowi4_oif = dev->ifindex,
376                 .flowi4_tos = RT_TOS(ip4h->tos),
377                 .flowi4_flags = FLOWI_FLAG_ANYSRC,
378                 .daddr = ip4h->daddr,
379                 .saddr = ip4h->saddr,
380         };
381
382         rt = ip_route_output_flow(net, &fl4, NULL);
383         if (IS_ERR(rt))
384                 goto err;
385
386         if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
387                 ip_rt_put(rt);
388                 goto err;
389         }
390         skb_dst_set(skb, &rt->dst);
391         err = ip_local_out(net, skb->sk, skb);
392         if (unlikely(net_xmit_eval(err)))
393                 dev->stats.tx_errors++;
394         else
395                 ret = NET_XMIT_SUCCESS;
396         goto out;
397 err:
398         dev->stats.tx_errors++;
399         kfree_skb(skb);
400 out:
401         return ret;
402 }
403
404 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
405 {
406         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
407         struct net_device *dev = skb->dev;
408         struct net *net = dev_net(dev);
409         struct dst_entry *dst;
410         int err, ret = NET_XMIT_DROP;
411         struct flowi6 fl6 = {
412                 .flowi6_oif = dev->ifindex,
413                 .daddr = ip6h->daddr,
414                 .saddr = ip6h->saddr,
415                 .flowi6_flags = FLOWI_FLAG_ANYSRC,
416                 .flowlabel = ip6_flowinfo(ip6h),
417                 .flowi6_mark = skb->mark,
418                 .flowi6_proto = ip6h->nexthdr,
419         };
420
421         dst = ip6_route_output(net, NULL, &fl6);
422         if (dst->error) {
423                 ret = dst->error;
424                 dst_release(dst);
425                 goto err;
426         }
427         skb_dst_set(skb, dst);
428         err = ip6_local_out(net, skb->sk, skb);
429         if (unlikely(net_xmit_eval(err)))
430                 dev->stats.tx_errors++;
431         else
432                 ret = NET_XMIT_SUCCESS;
433         goto out;
434 err:
435         dev->stats.tx_errors++;
436         kfree_skb(skb);
437 out:
438         return ret;
439 }
440
441 static int ipvlan_process_outbound(struct sk_buff *skb)
442 {
443         struct ethhdr *ethh = eth_hdr(skb);
444         int ret = NET_XMIT_DROP;
445
446         /* In this mode we dont care about multicast and broadcast traffic */
447         if (is_multicast_ether_addr(ethh->h_dest)) {
448                 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
449                                     ntohs(skb->protocol));
450                 kfree_skb(skb);
451                 goto out;
452         }
453
454         /* The ipvlan is a pseudo-L2 device, so the packets that we receive
455          * will have L2; which need to discarded and processed further
456          * in the net-ns of the main-device.
457          */
458         if (skb_mac_header_was_set(skb)) {
459                 skb_pull(skb, sizeof(*ethh));
460                 skb->mac_header = (typeof(skb->mac_header))~0U;
461                 skb_reset_network_header(skb);
462         }
463
464         if (skb->protocol == htons(ETH_P_IPV6))
465                 ret = ipvlan_process_v6_outbound(skb);
466         else if (skb->protocol == htons(ETH_P_IP))
467                 ret = ipvlan_process_v4_outbound(skb);
468         else {
469                 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
470                                     ntohs(skb->protocol));
471                 kfree_skb(skb);
472         }
473 out:
474         return ret;
475 }
476
477 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
478                                      struct sk_buff *skb, bool tx_pkt)
479 {
480         if (skb->protocol == htons(ETH_P_PAUSE)) {
481                 kfree_skb(skb);
482                 return;
483         }
484
485         /* Record that the deferred packet is from TX or RX path. By
486          * looking at mac-addresses on packet will lead to erronus decisions.
487          * (This would be true for a loopback-mode on master device or a
488          * hair-pin mode of the switch.)
489          */
490         IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
491
492         spin_lock(&port->backlog.lock);
493         if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
494                 if (skb->dev)
495                         dev_hold(skb->dev);
496                 __skb_queue_tail(&port->backlog, skb);
497                 spin_unlock(&port->backlog.lock);
498                 schedule_work(&port->wq);
499         } else {
500                 spin_unlock(&port->backlog.lock);
501                 atomic_long_inc(&skb->dev->rx_dropped);
502                 kfree_skb(skb);
503         }
504 }
505
506 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
507 {
508         const struct ipvl_dev *ipvlan = netdev_priv(dev);
509         void *lyr3h;
510         struct ipvl_addr *addr;
511         int addr_type;
512
513         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
514         if (!lyr3h)
515                 goto out;
516
517         if (!ipvlan_is_vepa(ipvlan->port)) {
518                 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
519                 if (addr) {
520                         if (ipvlan_is_private(ipvlan->port)) {
521                                 consume_skb(skb);
522                                 return NET_XMIT_DROP;
523                         }
524                         return ipvlan_rcv_frame(addr, &skb, true);
525                 }
526         }
527 out:
528         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
529         return ipvlan_process_outbound(skb);
530 }
531
532 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
533 {
534         const struct ipvl_dev *ipvlan = netdev_priv(dev);
535         struct ethhdr *eth = eth_hdr(skb);
536         struct ipvl_addr *addr;
537         void *lyr3h;
538         int addr_type;
539
540         if (!ipvlan_is_vepa(ipvlan->port) &&
541             ether_addr_equal(eth->h_dest, eth->h_source)) {
542                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
543                 if (lyr3h) {
544                         addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
545                         if (addr) {
546                                 if (ipvlan_is_private(ipvlan->port)) {
547                                         consume_skb(skb);
548                                         return NET_XMIT_DROP;
549                                 }
550                                 return ipvlan_rcv_frame(addr, &skb, true);
551                         }
552                 }
553                 skb = skb_share_check(skb, GFP_ATOMIC);
554                 if (!skb)
555                         return NET_XMIT_DROP;
556
557                 /* Packet definitely does not belong to any of the
558                  * virtual devices, but the dest is local. So forward
559                  * the skb for the main-dev. At the RX side we just return
560                  * RX_PASS for it to be processed further on the stack.
561                  */
562                 return dev_forward_skb(ipvlan->phy_dev, skb);
563
564         } else if (is_multicast_ether_addr(eth->h_dest)) {
565                 ipvlan_skb_crossing_ns(skb, NULL);
566                 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
567                 return NET_XMIT_SUCCESS;
568         }
569
570         ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
571         return dev_queue_xmit(skb);
572 }
573
574 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
575 {
576         struct ipvl_dev *ipvlan = netdev_priv(dev);
577         struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
578
579         if (!port)
580                 goto out;
581
582         if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
583                 goto out;
584
585         switch(port->mode) {
586         case IPVLAN_MODE_L2:
587                 return ipvlan_xmit_mode_l2(skb, dev);
588         case IPVLAN_MODE_L3:
589         case IPVLAN_MODE_L3S:
590                 return ipvlan_xmit_mode_l3(skb, dev);
591         }
592
593         /* Should not reach here */
594         WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
595                           port->mode);
596 out:
597         kfree_skb(skb);
598         return NET_XMIT_DROP;
599 }
600
601 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
602 {
603         struct ethhdr *eth = eth_hdr(skb);
604         struct ipvl_addr *addr;
605         void *lyr3h;
606         int addr_type;
607
608         if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
609                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
610                 if (!lyr3h)
611                         return true;
612
613                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
614                 if (addr)
615                         return false;
616         }
617
618         return true;
619 }
620
621 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
622                                                  struct ipvl_port *port)
623 {
624         void *lyr3h;
625         int addr_type;
626         struct ipvl_addr *addr;
627         struct sk_buff *skb = *pskb;
628         rx_handler_result_t ret = RX_HANDLER_PASS;
629
630         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
631         if (!lyr3h)
632                 goto out;
633
634         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
635         if (addr)
636                 ret = ipvlan_rcv_frame(addr, pskb, false);
637
638 out:
639         return ret;
640 }
641
642 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
643                                                  struct ipvl_port *port)
644 {
645         struct sk_buff *skb = *pskb;
646         struct ethhdr *eth = eth_hdr(skb);
647         rx_handler_result_t ret = RX_HANDLER_PASS;
648         void *lyr3h;
649         int addr_type;
650
651         if (is_multicast_ether_addr(eth->h_dest)) {
652                 if (ipvlan_external_frame(skb, port)) {
653                         struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
654
655                         /* External frames are queued for device local
656                          * distribution, but a copy is given to master
657                          * straight away to avoid sending duplicates later
658                          * when work-queue processes this frame. This is
659                          * achieved by returning RX_HANDLER_PASS.
660                          */
661                         if (nskb) {
662                                 ipvlan_skb_crossing_ns(nskb, NULL);
663                                 ipvlan_multicast_enqueue(port, nskb, false);
664                         }
665                 }
666         } else {
667                 struct ipvl_addr *addr;
668
669                 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
670                 if (!lyr3h)
671                         return ret;
672
673                 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
674                 if (addr)
675                         ret = ipvlan_rcv_frame(addr, pskb, false);
676         }
677
678         return ret;
679 }
680
681 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
682 {
683         struct sk_buff *skb = *pskb;
684         struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
685
686         if (!port)
687                 return RX_HANDLER_PASS;
688
689         switch (port->mode) {
690         case IPVLAN_MODE_L2:
691                 return ipvlan_handle_mode_l2(pskb, port);
692         case IPVLAN_MODE_L3:
693                 return ipvlan_handle_mode_l3(pskb, port);
694         case IPVLAN_MODE_L3S:
695                 return RX_HANDLER_PASS;
696         }
697
698         /* Should not reach here */
699         WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
700                           port->mode);
701         kfree_skb(skb);
702         return RX_HANDLER_CONSUMED;
703 }
704
705 static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
706                                             struct net_device *dev)
707 {
708         struct ipvl_addr *addr = NULL;
709         struct ipvl_port *port;
710         void *lyr3h;
711         int addr_type;
712
713         if (!dev || !netif_is_ipvlan_port(dev))
714                 goto out;
715
716         port = ipvlan_port_get_rcu(dev);
717         if (!port || port->mode != IPVLAN_MODE_L3S)
718                 goto out;
719
720         lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
721         if (!lyr3h)
722                 goto out;
723
724         addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
725 out:
726         return addr;
727 }
728
729 struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
730                               u16 proto)
731 {
732         struct ipvl_addr *addr;
733         struct net_device *sdev;
734
735         addr = ipvlan_skb_to_addr(skb, dev);
736         if (!addr)
737                 goto out;
738
739         sdev = addr->master->dev;
740         switch (proto) {
741         case AF_INET:
742         {
743                 int err;
744                 struct iphdr *ip4h = ip_hdr(skb);
745
746                 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
747                                            ip4h->tos, sdev);
748                 if (unlikely(err))
749                         goto out;
750                 break;
751         }
752         case AF_INET6:
753         {
754                 struct dst_entry *dst;
755                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
756                 int flags = RT6_LOOKUP_F_HAS_SADDR;
757                 struct flowi6 fl6 = {
758                         .flowi6_iif   = sdev->ifindex,
759                         .daddr        = ip6h->daddr,
760                         .saddr        = ip6h->saddr,
761                         .flowlabel    = ip6_flowinfo(ip6h),
762                         .flowi6_mark  = skb->mark,
763                         .flowi6_proto = ip6h->nexthdr,
764                 };
765
766                 skb_dst_drop(skb);
767                 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags);
768                 skb_dst_set(skb, dst);
769                 break;
770         }
771         default:
772                 break;
773         }
774
775 out:
776         return skb;
777 }
778
779 unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
780                              const struct nf_hook_state *state)
781 {
782         struct ipvl_addr *addr;
783         unsigned int len;
784
785         addr = ipvlan_skb_to_addr(skb, skb->dev);
786         if (!addr)
787                 goto out;
788
789         skb->dev = addr->master->dev;
790         len = skb->len + ETH_HLEN;
791         ipvlan_count_rx(addr->master, len, true, false);
792 out:
793         return NF_ACCEPT;
794 }