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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 */
4
5#include "ipvlan.h"
6
7static u32 ipvlan_jhash_secret __read_mostly;
8
9void ipvlan_init_secret(void)
10{
11 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
12}
13
14void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
15 unsigned int len, bool success, bool mcast)
16{
17 if (likely(success)) {
18 struct ipvl_pcpu_stats *pcptr;
19
20 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
21 u64_stats_update_begin(&pcptr->syncp);
22 pcptr->rx_pkts++;
23 pcptr->rx_bytes += len;
24 if (mcast)
25 pcptr->rx_mcast++;
26 u64_stats_update_end(&pcptr->syncp);
27 } else {
28 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
29 }
30}
31EXPORT_SYMBOL_GPL(ipvlan_count_rx);
32
33#if IS_ENABLED(CONFIG_IPV6)
34static u8 ipvlan_get_v6_hash(const void *iaddr)
35{
36 const struct in6_addr *ip6_addr = iaddr;
37
38 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
39 IPVLAN_HASH_MASK;
40}
41#else
42static u8 ipvlan_get_v6_hash(const void *iaddr)
43{
44 return 0;
45}
46#endif
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 bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
57{
58 if (!is_v6 && addr->atype == IPVL_IPV4) {
59 struct in_addr *i4addr = (struct in_addr *)iaddr;
60
61 return addr->ip4addr.s_addr == i4addr->s_addr;
62#if IS_ENABLED(CONFIG_IPV6)
63 } else if (is_v6 && addr->atype == IPVL_IPV6) {
64 struct in6_addr *i6addr = (struct in6_addr *)iaddr;
65
66 return ipv6_addr_equal(&addr->ip6addr, i6addr);
67#endif
68 }
69
70 return false;
71}
72
73static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
74 const void *iaddr, bool is_v6)
75{
76 struct ipvl_addr *addr;
77 u8 hash;
78
79 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
80 ipvlan_get_v4_hash(iaddr);
81 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
82 if (addr_equal(is_v6, addr, iaddr))
83 return addr;
84 return NULL;
85}
86
87void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
88{
89 struct ipvl_port *port = ipvlan->port;
90 u8 hash;
91
92 hash = (addr->atype == IPVL_IPV6) ?
93 ipvlan_get_v6_hash(&addr->ip6addr) :
94 ipvlan_get_v4_hash(&addr->ip4addr);
95 if (hlist_unhashed(&addr->hlnode))
96 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
97}
98
99void ipvlan_ht_addr_del(struct ipvl_addr *addr)
100{
101 hlist_del_init_rcu(&addr->hlnode);
102}
103
104struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
105 const void *iaddr, bool is_v6)
106{
107 struct ipvl_addr *addr, *ret = NULL;
108
109 rcu_read_lock();
110 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
111 if (addr_equal(is_v6, addr, iaddr)) {
112 ret = addr;
113 break;
114 }
115 }
116 rcu_read_unlock();
117 return ret;
118}
119
120bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
121{
122 struct ipvl_dev *ipvlan;
123 bool ret = false;
124
125 rcu_read_lock();
126 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
127 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
128 ret = true;
129 break;
130 }
131 }
132 rcu_read_unlock();
133 return ret;
134}
135
136void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
137{
138 void *lyr3h = NULL;
139
140 switch (skb->protocol) {
141 case htons(ETH_P_ARP): {
142 struct arphdr *arph;
143
144 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
145 return NULL;
146
147 arph = arp_hdr(skb);
148 *type = IPVL_ARP;
149 lyr3h = arph;
150 break;
151 }
152 case htons(ETH_P_IP): {
153 u32 pktlen;
154 struct iphdr *ip4h;
155
156 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
157 return NULL;
158
159 ip4h = ip_hdr(skb);
160 pktlen = ntohs(ip4h->tot_len);
161 if (ip4h->ihl < 5 || ip4h->version != 4)
162 return NULL;
163 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
164 return NULL;
165
166 *type = IPVL_IPV4;
167 lyr3h = ip4h;
168 break;
169 }
170#if IS_ENABLED(CONFIG_IPV6)
171 case htons(ETH_P_IPV6): {
172 struct ipv6hdr *ip6h;
173
174 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
175 return NULL;
176
177 ip6h = ipv6_hdr(skb);
178 if (ip6h->version != 6)
179 return NULL;
180
181 *type = IPVL_IPV6;
182 lyr3h = ip6h;
183 /* Only Neighbour Solicitation pkts need different treatment */
184 if (ipv6_addr_any(&ip6h->saddr) &&
185 ip6h->nexthdr == NEXTHDR_ICMP) {
186 struct icmp6hdr *icmph;
187
188 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
189 return NULL;
190
191 ip6h = ipv6_hdr(skb);
192 icmph = (struct icmp6hdr *)(ip6h + 1);
193
194 if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
195 /* Need to access the ipv6 address in body */
196 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
197 + sizeof(struct in6_addr))))
198 return NULL;
199
200 ip6h = ipv6_hdr(skb);
201 icmph = (struct icmp6hdr *)(ip6h + 1);
202 }
203
204 *type = IPVL_ICMPV6;
205 lyr3h = icmph;
206 }
207 break;
208 }
209#endif
210 default:
211 return NULL;
212 }
213
214 return lyr3h;
215}
216
217unsigned int ipvlan_mac_hash(const unsigned char *addr)
218{
219 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
220 ipvlan_jhash_secret);
221
222 return hash & IPVLAN_MAC_FILTER_MASK;
223}
224
225void ipvlan_process_multicast(struct work_struct *work)
226{
227 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
228 struct ethhdr *ethh;
229 struct ipvl_dev *ipvlan;
230 struct sk_buff *skb, *nskb;
231 struct sk_buff_head list;
232 unsigned int len;
233 unsigned int mac_hash;
234 int ret;
235 u8 pkt_type;
236 bool tx_pkt;
237
238 __skb_queue_head_init(&list);
239
240 spin_lock_bh(&port->backlog.lock);
241 skb_queue_splice_tail_init(&port->backlog, &list);
242 spin_unlock_bh(&port->backlog.lock);
243
244 while ((skb = __skb_dequeue(&list)) != NULL) {
245 struct net_device *dev = skb->dev;
246 bool consumed = false;
247
248 ethh = eth_hdr(skb);
249 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
250 mac_hash = ipvlan_mac_hash(ethh->h_dest);
251
252 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
253 pkt_type = PACKET_BROADCAST;
254 else
255 pkt_type = PACKET_MULTICAST;
256
257 rcu_read_lock();
258 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
259 if (tx_pkt && (ipvlan->dev == skb->dev))
260 continue;
261 if (!test_bit(mac_hash, ipvlan->mac_filters))
262 continue;
263 if (!(ipvlan->dev->flags & IFF_UP))
264 continue;
265 ret = NET_RX_DROP;
266 len = skb->len + ETH_HLEN;
267 nskb = skb_clone(skb, GFP_ATOMIC);
268 local_bh_disable();
269 if (nskb) {
270 consumed = true;
271 nskb->pkt_type = pkt_type;
272 nskb->dev = ipvlan->dev;
273 if (tx_pkt)
274 ret = dev_forward_skb(ipvlan->dev, nskb);
275 else
276 ret = netif_rx(nskb);
277 }
278 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
279 local_bh_enable();
280 }
281 rcu_read_unlock();
282
283 if (tx_pkt) {
284 /* If the packet originated here, send it out. */
285 skb->dev = port->dev;
286 skb->pkt_type = pkt_type;
287 dev_queue_xmit(skb);
288 } else {
289 if (consumed)
290 consume_skb(skb);
291 else
292 kfree_skb(skb);
293 }
294 if (dev)
295 dev_put(dev);
296 }
297}
298
299static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
300{
301 bool xnet = true;
302
303 if (dev)
304 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
305
306 skb_scrub_packet(skb, xnet);
307 if (dev)
308 skb->dev = dev;
309}
310
311static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
312 bool local)
313{
314 struct ipvl_dev *ipvlan = addr->master;
315 struct net_device *dev = ipvlan->dev;
316 unsigned int len;
317 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
318 bool success = false;
319 struct sk_buff *skb = *pskb;
320
321 len = skb->len + ETH_HLEN;
322 /* Only packets exchanged between two local slaves need to have
323 * device-up check as well as skb-share check.
324 */
325 if (local) {
326 if (unlikely(!(dev->flags & IFF_UP))) {
327 kfree_skb(skb);
328 goto out;
329 }
330
331 skb = skb_share_check(skb, GFP_ATOMIC);
332 if (!skb)
333 goto out;
334
335 *pskb = skb;
336 }
337
338 if (local) {
339 skb->pkt_type = PACKET_HOST;
340 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
341 success = true;
342 } else {
343 skb->dev = dev;
344 ret = RX_HANDLER_ANOTHER;
345 success = true;
346 }
347
348out:
349 ipvlan_count_rx(ipvlan, len, success, false);
350 return ret;
351}
352
353struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
354 int addr_type, bool use_dest)
355{
356 struct ipvl_addr *addr = NULL;
357
358 switch (addr_type) {
359#if IS_ENABLED(CONFIG_IPV6)
360 case IPVL_IPV6: {
361 struct ipv6hdr *ip6h;
362 struct in6_addr *i6addr;
363
364 ip6h = (struct ipv6hdr *)lyr3h;
365 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
366 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
367 break;
368 }
369 case IPVL_ICMPV6: {
370 struct nd_msg *ndmh;
371 struct in6_addr *i6addr;
372
373 /* Make sure that the NeighborSolicitation ICMPv6 packets
374 * are handled to avoid DAD issue.
375 */
376 ndmh = (struct nd_msg *)lyr3h;
377 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
378 i6addr = &ndmh->target;
379 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
380 }
381 break;
382 }
383#endif
384 case IPVL_IPV4: {
385 struct iphdr *ip4h;
386 __be32 *i4addr;
387
388 ip4h = (struct iphdr *)lyr3h;
389 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
390 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
391 break;
392 }
393 case IPVL_ARP: {
394 struct arphdr *arph;
395 unsigned char *arp_ptr;
396 __be32 dip;
397
398 arph = (struct arphdr *)lyr3h;
399 arp_ptr = (unsigned char *)(arph + 1);
400 if (use_dest)
401 arp_ptr += (2 * port->dev->addr_len) + 4;
402 else
403 arp_ptr += port->dev->addr_len;
404
405 memcpy(&dip, arp_ptr, 4);
406 addr = ipvlan_ht_addr_lookup(port, &dip, false);
407 break;
408 }
409 }
410
411 return addr;
412}
413
414static int ipvlan_process_v4_outbound(struct sk_buff *skb)
415{
416 const struct iphdr *ip4h = ip_hdr(skb);
417 struct net_device *dev = skb->dev;
418 struct net *net = dev_net(dev);
419 struct rtable *rt;
420 int err, ret = NET_XMIT_DROP;
421 struct flowi4 fl4 = {
422 .flowi4_oif = dev->ifindex,
423 .flowi4_tos = RT_TOS(ip4h->tos),
424 .flowi4_flags = FLOWI_FLAG_ANYSRC,
425 .flowi4_mark = skb->mark,
426 .daddr = ip4h->daddr,
427 .saddr = ip4h->saddr,
428 };
429
430 rt = ip_route_output_flow(net, &fl4, NULL);
431 if (IS_ERR(rt))
432 goto err;
433
434 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
435 ip_rt_put(rt);
436 goto err;
437 }
438 skb_dst_set(skb, &rt->dst);
439 err = ip_local_out(net, skb->sk, skb);
440 if (unlikely(net_xmit_eval(err)))
441 dev->stats.tx_errors++;
442 else
443 ret = NET_XMIT_SUCCESS;
444 goto out;
445err:
446 dev->stats.tx_errors++;
447 kfree_skb(skb);
448out:
449 return ret;
450}
451
452#if IS_ENABLED(CONFIG_IPV6)
453static int ipvlan_process_v6_outbound(struct sk_buff *skb)
454{
455 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
456 struct net_device *dev = skb->dev;
457 struct net *net = dev_net(dev);
458 struct dst_entry *dst;
459 int err, ret = NET_XMIT_DROP;
460 struct flowi6 fl6 = {
461 .flowi6_oif = dev->ifindex,
462 .daddr = ip6h->daddr,
463 .saddr = ip6h->saddr,
464 .flowi6_flags = FLOWI_FLAG_ANYSRC,
465 .flowlabel = ip6_flowinfo(ip6h),
466 .flowi6_mark = skb->mark,
467 .flowi6_proto = ip6h->nexthdr,
468 };
469
470 dst = ip6_route_output(net, NULL, &fl6);
471 if (dst->error) {
472 ret = dst->error;
473 dst_release(dst);
474 goto err;
475 }
476 skb_dst_set(skb, dst);
477 err = ip6_local_out(net, skb->sk, skb);
478 if (unlikely(net_xmit_eval(err)))
479 dev->stats.tx_errors++;
480 else
481 ret = NET_XMIT_SUCCESS;
482 goto out;
483err:
484 dev->stats.tx_errors++;
485 kfree_skb(skb);
486out:
487 return ret;
488}
489#else
490static int ipvlan_process_v6_outbound(struct sk_buff *skb)
491{
492 return NET_XMIT_DROP;
493}
494#endif
495
496static int ipvlan_process_outbound(struct sk_buff *skb)
497{
498 struct ethhdr *ethh = eth_hdr(skb);
499 int ret = NET_XMIT_DROP;
500
501 /* In this mode we dont care about multicast and broadcast traffic */
502 if (is_multicast_ether_addr(ethh->h_dest)) {
503 pr_debug_ratelimited("Dropped {multi|broad}cast of type=[%x]\n",
504 ntohs(skb->protocol));
505 kfree_skb(skb);
506 goto out;
507 }
508
509 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
510 * will have L2; which need to discarded and processed further
511 * in the net-ns of the main-device.
512 */
513 if (skb_mac_header_was_set(skb)) {
514 skb_pull(skb, sizeof(*ethh));
515 skb->mac_header = (typeof(skb->mac_header))~0U;
516 skb_reset_network_header(skb);
517 }
518
519 if (skb->protocol == htons(ETH_P_IPV6))
520 ret = ipvlan_process_v6_outbound(skb);
521 else if (skb->protocol == htons(ETH_P_IP))
522 ret = ipvlan_process_v4_outbound(skb);
523 else {
524 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
525 ntohs(skb->protocol));
526 kfree_skb(skb);
527 }
528out:
529 return ret;
530}
531
532static void ipvlan_multicast_enqueue(struct ipvl_port *port,
533 struct sk_buff *skb, bool tx_pkt)
534{
535 if (skb->protocol == htons(ETH_P_PAUSE)) {
536 kfree_skb(skb);
537 return;
538 }
539
540 /* Record that the deferred packet is from TX or RX path. By
541 * looking at mac-addresses on packet will lead to erronus decisions.
542 * (This would be true for a loopback-mode on master device or a
543 * hair-pin mode of the switch.)
544 */
545 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
546
547 spin_lock(&port->backlog.lock);
548 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
549 if (skb->dev)
550 dev_hold(skb->dev);
551 __skb_queue_tail(&port->backlog, skb);
552 spin_unlock(&port->backlog.lock);
553 schedule_work(&port->wq);
554 } else {
555 spin_unlock(&port->backlog.lock);
556 atomic_long_inc(&skb->dev->rx_dropped);
557 kfree_skb(skb);
558 }
559}
560
561static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
562{
563 const struct ipvl_dev *ipvlan = netdev_priv(dev);
564 void *lyr3h;
565 struct ipvl_addr *addr;
566 int addr_type;
567
568 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
569 if (!lyr3h)
570 goto out;
571
572 if (!ipvlan_is_vepa(ipvlan->port)) {
573 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
574 if (addr) {
575 if (ipvlan_is_private(ipvlan->port)) {
576 consume_skb(skb);
577 return NET_XMIT_DROP;
578 }
579 return ipvlan_rcv_frame(addr, &skb, true);
580 }
581 }
582out:
583 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
584 return ipvlan_process_outbound(skb);
585}
586
587static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
588{
589 const struct ipvl_dev *ipvlan = netdev_priv(dev);
590 struct ethhdr *eth = eth_hdr(skb);
591 struct ipvl_addr *addr;
592 void *lyr3h;
593 int addr_type;
594
595 if (!ipvlan_is_vepa(ipvlan->port) &&
596 ether_addr_equal(eth->h_dest, eth->h_source)) {
597 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
598 if (lyr3h) {
599 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
600 if (addr) {
601 if (ipvlan_is_private(ipvlan->port)) {
602 consume_skb(skb);
603 return NET_XMIT_DROP;
604 }
605 return ipvlan_rcv_frame(addr, &skb, true);
606 }
607 }
608 skb = skb_share_check(skb, GFP_ATOMIC);
609 if (!skb)
610 return NET_XMIT_DROP;
611
612 /* Packet definitely does not belong to any of the
613 * virtual devices, but the dest is local. So forward
614 * the skb for the main-dev. At the RX side we just return
615 * RX_PASS for it to be processed further on the stack.
616 */
617 return dev_forward_skb(ipvlan->phy_dev, skb);
618
619 } else if (is_multicast_ether_addr(eth->h_dest)) {
620 ipvlan_skb_crossing_ns(skb, NULL);
621 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
622 return NET_XMIT_SUCCESS;
623 }
624
625 skb->dev = ipvlan->phy_dev;
626 return dev_queue_xmit(skb);
627}
628
629int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
630{
631 struct ipvl_dev *ipvlan = netdev_priv(dev);
632 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
633
634 if (!port)
635 goto out;
636
637 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
638 goto out;
639
640 switch(port->mode) {
641 case IPVLAN_MODE_L2:
642 return ipvlan_xmit_mode_l2(skb, dev);
643 case IPVLAN_MODE_L3:
644#ifdef CONFIG_IPVLAN_L3S
645 case IPVLAN_MODE_L3S:
646#endif
647 return ipvlan_xmit_mode_l3(skb, dev);
648 }
649
650 /* Should not reach here */
651 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
652 port->mode);
653out:
654 kfree_skb(skb);
655 return NET_XMIT_DROP;
656}
657
658static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
659{
660 struct ethhdr *eth = eth_hdr(skb);
661 struct ipvl_addr *addr;
662 void *lyr3h;
663 int addr_type;
664
665 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
666 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
667 if (!lyr3h)
668 return true;
669
670 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
671 if (addr)
672 return false;
673 }
674
675 return true;
676}
677
678static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
679 struct ipvl_port *port)
680{
681 void *lyr3h;
682 int addr_type;
683 struct ipvl_addr *addr;
684 struct sk_buff *skb = *pskb;
685 rx_handler_result_t ret = RX_HANDLER_PASS;
686
687 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
688 if (!lyr3h)
689 goto out;
690
691 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
692 if (addr)
693 ret = ipvlan_rcv_frame(addr, pskb, false);
694
695out:
696 return ret;
697}
698
699static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
700 struct ipvl_port *port)
701{
702 struct sk_buff *skb = *pskb;
703 struct ethhdr *eth = eth_hdr(skb);
704 rx_handler_result_t ret = RX_HANDLER_PASS;
705
706 if (is_multicast_ether_addr(eth->h_dest)) {
707 if (ipvlan_external_frame(skb, port)) {
708 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
709
710 /* External frames are queued for device local
711 * distribution, but a copy is given to master
712 * straight away to avoid sending duplicates later
713 * when work-queue processes this frame. This is
714 * achieved by returning RX_HANDLER_PASS.
715 */
716 if (nskb) {
717 ipvlan_skb_crossing_ns(nskb, NULL);
718 ipvlan_multicast_enqueue(port, nskb, false);
719 }
720 }
721 } else {
722 /* Perform like l3 mode for non-multicast packet */
723 ret = ipvlan_handle_mode_l3(pskb, port);
724 }
725
726 return ret;
727}
728
729rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
730{
731 struct sk_buff *skb = *pskb;
732 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
733
734 if (!port)
735 return RX_HANDLER_PASS;
736
737 switch (port->mode) {
738 case IPVLAN_MODE_L2:
739 return ipvlan_handle_mode_l2(pskb, port);
740 case IPVLAN_MODE_L3:
741 return ipvlan_handle_mode_l3(pskb, port);
742#ifdef CONFIG_IPVLAN_L3S
743 case IPVLAN_MODE_L3S:
744 return RX_HANDLER_PASS;
745#endif
746 }
747
748 /* Should not reach here */
749 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
750 port->mode);
751 kfree_skb(skb);
752 return RX_HANDLER_CONSUMED;
753}