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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
12static u32 ipvlan_jhash_secret __read_mostly;
13
14void ipvlan_init_secret(void)
15{
16 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
17}
18
19static 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
40static 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
48static 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
56static 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
76void 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
88void ipvlan_ht_addr_del(struct ipvl_addr *addr)
89{
90 hlist_del_init_rcu(&addr->hlnode);
91}
92
93struct 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
108bool 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
121static 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
182unsigned 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
190void 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 tx_pkt;
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 struct net_device *dev = skb->dev;
211 bool consumed = false;
212
213 ethh = eth_hdr(skb);
214 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
215 mac_hash = ipvlan_mac_hash(ethh->h_dest);
216
217 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
218 pkt_type = PACKET_BROADCAST;
219 else
220 pkt_type = PACKET_MULTICAST;
221
222 rcu_read_lock();
223 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
224 if (tx_pkt && (ipvlan->dev == skb->dev))
225 continue;
226 if (!test_bit(mac_hash, ipvlan->mac_filters))
227 continue;
228 if (!(ipvlan->dev->flags & IFF_UP))
229 continue;
230 ret = NET_RX_DROP;
231 len = skb->len + ETH_HLEN;
232 nskb = skb_clone(skb, GFP_ATOMIC);
233 local_bh_disable();
234 if (nskb) {
235 consumed = true;
236 nskb->pkt_type = pkt_type;
237 nskb->dev = ipvlan->dev;
238 if (tx_pkt)
239 ret = dev_forward_skb(ipvlan->dev, nskb);
240 else
241 ret = netif_rx(nskb);
242 }
243 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
244 local_bh_enable();
245 }
246 rcu_read_unlock();
247
248 if (tx_pkt) {
249 /* If the packet originated here, send it out. */
250 skb->dev = port->dev;
251 skb->pkt_type = pkt_type;
252 dev_queue_xmit(skb);
253 } else {
254 if (consumed)
255 consume_skb(skb);
256 else
257 kfree_skb(skb);
258 }
259 if (dev)
260 dev_put(dev);
261 }
262}
263
264static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
265{
266 bool xnet = true;
267
268 if (dev)
269 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
270
271 skb_scrub_packet(skb, xnet);
272 if (dev)
273 skb->dev = dev;
274}
275
276static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
277 bool local)
278{
279 struct ipvl_dev *ipvlan = addr->master;
280 struct net_device *dev = ipvlan->dev;
281 unsigned int len;
282 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
283 bool success = false;
284 struct sk_buff *skb = *pskb;
285
286 len = skb->len + ETH_HLEN;
287 /* Only packets exchanged between two local slaves need to have
288 * device-up check as well as skb-share check.
289 */
290 if (local) {
291 if (unlikely(!(dev->flags & IFF_UP))) {
292 kfree_skb(skb);
293 goto out;
294 }
295
296 skb = skb_share_check(skb, GFP_ATOMIC);
297 if (!skb)
298 goto out;
299
300 *pskb = skb;
301 }
302 ipvlan_skb_crossing_ns(skb, dev);
303
304 if (local) {
305 skb->pkt_type = PACKET_HOST;
306 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
307 success = true;
308 } else {
309 ret = RX_HANDLER_ANOTHER;
310 success = true;
311 }
312
313out:
314 ipvlan_count_rx(ipvlan, len, success, false);
315 return ret;
316}
317
318static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
319 void *lyr3h, int addr_type,
320 bool use_dest)
321{
322 struct ipvl_addr *addr = NULL;
323
324 if (addr_type == IPVL_IPV6) {
325 struct ipv6hdr *ip6h;
326 struct in6_addr *i6addr;
327
328 ip6h = (struct ipv6hdr *)lyr3h;
329 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
330 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
331 } else if (addr_type == IPVL_ICMPV6) {
332 struct nd_msg *ndmh;
333 struct in6_addr *i6addr;
334
335 /* Make sure that the NeighborSolicitation ICMPv6 packets
336 * are handled to avoid DAD issue.
337 */
338 ndmh = (struct nd_msg *)lyr3h;
339 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
340 i6addr = &ndmh->target;
341 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
342 }
343 } else if (addr_type == IPVL_IPV4) {
344 struct iphdr *ip4h;
345 __be32 *i4addr;
346
347 ip4h = (struct iphdr *)lyr3h;
348 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
349 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
350 } else if (addr_type == IPVL_ARP) {
351 struct arphdr *arph;
352 unsigned char *arp_ptr;
353 __be32 dip;
354
355 arph = (struct arphdr *)lyr3h;
356 arp_ptr = (unsigned char *)(arph + 1);
357 if (use_dest)
358 arp_ptr += (2 * port->dev->addr_len) + 4;
359 else
360 arp_ptr += port->dev->addr_len;
361
362 memcpy(&dip, arp_ptr, 4);
363 addr = ipvlan_ht_addr_lookup(port, &dip, false);
364 }
365
366 return addr;
367}
368
369static int ipvlan_process_v4_outbound(struct sk_buff *skb)
370{
371 const struct iphdr *ip4h = ip_hdr(skb);
372 struct net_device *dev = skb->dev;
373 struct net *net = dev_net(dev);
374 struct rtable *rt;
375 int err, ret = NET_XMIT_DROP;
376 struct flowi4 fl4 = {
377 .flowi4_oif = dev->ifindex,
378 .flowi4_tos = RT_TOS(ip4h->tos),
379 .flowi4_flags = FLOWI_FLAG_ANYSRC,
380 .daddr = ip4h->daddr,
381 .saddr = ip4h->saddr,
382 };
383
384 rt = ip_route_output_flow(net, &fl4, NULL);
385 if (IS_ERR(rt))
386 goto err;
387
388 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
389 ip_rt_put(rt);
390 goto err;
391 }
392 skb_dst_set(skb, &rt->dst);
393 err = ip_local_out(net, skb->sk, skb);
394 if (unlikely(net_xmit_eval(err)))
395 dev->stats.tx_errors++;
396 else
397 ret = NET_XMIT_SUCCESS;
398 goto out;
399err:
400 dev->stats.tx_errors++;
401 kfree_skb(skb);
402out:
403 return ret;
404}
405
406static int ipvlan_process_v6_outbound(struct sk_buff *skb)
407{
408 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
409 struct net_device *dev = skb->dev;
410 struct net *net = dev_net(dev);
411 struct dst_entry *dst;
412 int err, ret = NET_XMIT_DROP;
413 struct flowi6 fl6 = {
414 .flowi6_iif = dev->ifindex,
415 .daddr = ip6h->daddr,
416 .saddr = ip6h->saddr,
417 .flowi6_flags = FLOWI_FLAG_ANYSRC,
418 .flowlabel = ip6_flowinfo(ip6h),
419 .flowi6_mark = skb->mark,
420 .flowi6_proto = ip6h->nexthdr,
421 };
422
423 dst = ip6_route_output(net, NULL, &fl6);
424 if (dst->error) {
425 ret = dst->error;
426 dst_release(dst);
427 goto err;
428 }
429 skb_dst_set(skb, dst);
430 err = ip6_local_out(net, skb->sk, skb);
431 if (unlikely(net_xmit_eval(err)))
432 dev->stats.tx_errors++;
433 else
434 ret = NET_XMIT_SUCCESS;
435 goto out;
436err:
437 dev->stats.tx_errors++;
438 kfree_skb(skb);
439out:
440 return ret;
441}
442
443static int ipvlan_process_outbound(struct sk_buff *skb)
444{
445 struct ethhdr *ethh = eth_hdr(skb);
446 int ret = NET_XMIT_DROP;
447
448 /* In this mode we dont care about multicast and broadcast traffic */
449 if (is_multicast_ether_addr(ethh->h_dest)) {
450 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
451 ntohs(skb->protocol));
452 kfree_skb(skb);
453 goto out;
454 }
455
456 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
457 * will have L2; which need to discarded and processed further
458 * in the net-ns of the main-device.
459 */
460 if (skb_mac_header_was_set(skb)) {
461 skb_pull(skb, sizeof(*ethh));
462 skb->mac_header = (typeof(skb->mac_header))~0U;
463 skb_reset_network_header(skb);
464 }
465
466 if (skb->protocol == htons(ETH_P_IPV6))
467 ret = ipvlan_process_v6_outbound(skb);
468 else if (skb->protocol == htons(ETH_P_IP))
469 ret = ipvlan_process_v4_outbound(skb);
470 else {
471 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
472 ntohs(skb->protocol));
473 kfree_skb(skb);
474 }
475out:
476 return ret;
477}
478
479static void ipvlan_multicast_enqueue(struct ipvl_port *port,
480 struct sk_buff *skb, bool tx_pkt)
481{
482 if (skb->protocol == htons(ETH_P_PAUSE)) {
483 kfree_skb(skb);
484 return;
485 }
486
487 /* Record that the deferred packet is from TX or RX path. By
488 * looking at mac-addresses on packet will lead to erronus decisions.
489 * (This would be true for a loopback-mode on master device or a
490 * hair-pin mode of the switch.)
491 */
492 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
493
494 spin_lock(&port->backlog.lock);
495 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
496 if (skb->dev)
497 dev_hold(skb->dev);
498 __skb_queue_tail(&port->backlog, skb);
499 spin_unlock(&port->backlog.lock);
500 schedule_work(&port->wq);
501 } else {
502 spin_unlock(&port->backlog.lock);
503 atomic_long_inc(&skb->dev->rx_dropped);
504 kfree_skb(skb);
505 }
506}
507
508static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
509{
510 const struct ipvl_dev *ipvlan = netdev_priv(dev);
511 void *lyr3h;
512 struct ipvl_addr *addr;
513 int addr_type;
514
515 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
516 if (!lyr3h)
517 goto out;
518
519 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
520 if (addr)
521 return ipvlan_rcv_frame(addr, &skb, true);
522
523out:
524 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
525 return ipvlan_process_outbound(skb);
526}
527
528static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
529{
530 const struct ipvl_dev *ipvlan = netdev_priv(dev);
531 struct ethhdr *eth = eth_hdr(skb);
532 struct ipvl_addr *addr;
533 void *lyr3h;
534 int addr_type;
535
536 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
537 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
538 if (lyr3h) {
539 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
540 if (addr)
541 return ipvlan_rcv_frame(addr, &skb, true);
542 }
543 skb = skb_share_check(skb, GFP_ATOMIC);
544 if (!skb)
545 return NET_XMIT_DROP;
546
547 /* Packet definitely does not belong to any of the
548 * virtual devices, but the dest is local. So forward
549 * the skb for the main-dev. At the RX side we just return
550 * RX_PASS for it to be processed further on the stack.
551 */
552 return dev_forward_skb(ipvlan->phy_dev, skb);
553
554 } else if (is_multicast_ether_addr(eth->h_dest)) {
555 ipvlan_skb_crossing_ns(skb, NULL);
556 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
557 return NET_XMIT_SUCCESS;
558 }
559
560 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
561 return dev_queue_xmit(skb);
562}
563
564int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
565{
566 struct ipvl_dev *ipvlan = netdev_priv(dev);
567 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
568
569 if (!port)
570 goto out;
571
572 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
573 goto out;
574
575 switch(port->mode) {
576 case IPVLAN_MODE_L2:
577 return ipvlan_xmit_mode_l2(skb, dev);
578 case IPVLAN_MODE_L3:
579 case IPVLAN_MODE_L3S:
580 return ipvlan_xmit_mode_l3(skb, dev);
581 }
582
583 /* Should not reach here */
584 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
585 port->mode);
586out:
587 kfree_skb(skb);
588 return NET_XMIT_DROP;
589}
590
591static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
592{
593 struct ethhdr *eth = eth_hdr(skb);
594 struct ipvl_addr *addr;
595 void *lyr3h;
596 int addr_type;
597
598 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
599 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
600 if (!lyr3h)
601 return true;
602
603 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
604 if (addr)
605 return false;
606 }
607
608 return true;
609}
610
611static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
612 struct ipvl_port *port)
613{
614 void *lyr3h;
615 int addr_type;
616 struct ipvl_addr *addr;
617 struct sk_buff *skb = *pskb;
618 rx_handler_result_t ret = RX_HANDLER_PASS;
619
620 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
621 if (!lyr3h)
622 goto out;
623
624 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
625 if (addr)
626 ret = ipvlan_rcv_frame(addr, pskb, false);
627
628out:
629 return ret;
630}
631
632static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
633 struct ipvl_port *port)
634{
635 struct sk_buff *skb = *pskb;
636 struct ethhdr *eth = eth_hdr(skb);
637 rx_handler_result_t ret = RX_HANDLER_PASS;
638 void *lyr3h;
639 int addr_type;
640
641 if (is_multicast_ether_addr(eth->h_dest)) {
642 if (ipvlan_external_frame(skb, port)) {
643 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
644
645 /* External frames are queued for device local
646 * distribution, but a copy is given to master
647 * straight away to avoid sending duplicates later
648 * when work-queue processes this frame. This is
649 * achieved by returning RX_HANDLER_PASS.
650 */
651 if (nskb) {
652 ipvlan_skb_crossing_ns(nskb, NULL);
653 ipvlan_multicast_enqueue(port, nskb, false);
654 }
655 }
656 } else {
657 struct ipvl_addr *addr;
658
659 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
660 if (!lyr3h)
661 return ret;
662
663 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
664 if (addr)
665 ret = ipvlan_rcv_frame(addr, pskb, false);
666 }
667
668 return ret;
669}
670
671rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
672{
673 struct sk_buff *skb = *pskb;
674 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
675
676 if (!port)
677 return RX_HANDLER_PASS;
678
679 switch (port->mode) {
680 case IPVLAN_MODE_L2:
681 return ipvlan_handle_mode_l2(pskb, port);
682 case IPVLAN_MODE_L3:
683 return ipvlan_handle_mode_l3(pskb, port);
684 case IPVLAN_MODE_L3S:
685 return RX_HANDLER_PASS;
686 }
687
688 /* Should not reach here */
689 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
690 port->mode);
691 kfree_skb(skb);
692 return RX_HANDLER_CONSUMED;
693}
694
695static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
696 struct net_device *dev)
697{
698 struct ipvl_addr *addr = NULL;
699 struct ipvl_port *port;
700 void *lyr3h;
701 int addr_type;
702
703 if (!dev || !netif_is_ipvlan_port(dev))
704 goto out;
705
706 port = ipvlan_port_get_rcu(dev);
707 if (!port || port->mode != IPVLAN_MODE_L3S)
708 goto out;
709
710 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
711 if (!lyr3h)
712 goto out;
713
714 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
715out:
716 return addr;
717}
718
719struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
720 u16 proto)
721{
722 struct ipvl_addr *addr;
723 struct net_device *sdev;
724
725 addr = ipvlan_skb_to_addr(skb, dev);
726 if (!addr)
727 goto out;
728
729 sdev = addr->master->dev;
730 switch (proto) {
731 case AF_INET:
732 {
733 int err;
734 struct iphdr *ip4h = ip_hdr(skb);
735
736 err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
737 ip4h->tos, sdev);
738 if (unlikely(err))
739 goto out;
740 break;
741 }
742 case AF_INET6:
743 {
744 struct dst_entry *dst;
745 struct ipv6hdr *ip6h = ipv6_hdr(skb);
746 int flags = RT6_LOOKUP_F_HAS_SADDR;
747 struct flowi6 fl6 = {
748 .flowi6_iif = sdev->ifindex,
749 .daddr = ip6h->daddr,
750 .saddr = ip6h->saddr,
751 .flowlabel = ip6_flowinfo(ip6h),
752 .flowi6_mark = skb->mark,
753 .flowi6_proto = ip6h->nexthdr,
754 };
755
756 skb_dst_drop(skb);
757 dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags);
758 skb_dst_set(skb, dst);
759 break;
760 }
761 default:
762 break;
763 }
764
765out:
766 return skb;
767}
768
769unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
770 const struct nf_hook_state *state)
771{
772 struct ipvl_addr *addr;
773 unsigned int len;
774
775 addr = ipvlan_skb_to_addr(skb, skb->dev);
776 if (!addr)
777 goto out;
778
779 skb->dev = addr->master->dev;
780 len = skb->len + ETH_HLEN;
781 ipvlan_count_rx(addr->master, len, true, false);
782out:
783 return NF_ACCEPT;
784}