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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 <net/inet_dscp.h>
6#include <net/ip.h>
7
8#include "ipvlan.h"
9
10static u32 ipvlan_jhash_secret __read_mostly;
11
12void ipvlan_init_secret(void)
13{
14 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
15}
16
17void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
18 unsigned int len, bool success, bool mcast)
19{
20 if (likely(success)) {
21 struct ipvl_pcpu_stats *pcptr;
22
23 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
24 u64_stats_update_begin(&pcptr->syncp);
25 u64_stats_inc(&pcptr->rx_pkts);
26 u64_stats_add(&pcptr->rx_bytes, len);
27 if (mcast)
28 u64_stats_inc(&pcptr->rx_mcast);
29 u64_stats_update_end(&pcptr->syncp);
30 } else {
31 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
32 }
33}
34EXPORT_SYMBOL_GPL(ipvlan_count_rx);
35
36#if IS_ENABLED(CONFIG_IPV6)
37static u8 ipvlan_get_v6_hash(const void *iaddr)
38{
39 const struct in6_addr *ip6_addr = iaddr;
40
41 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
42 IPVLAN_HASH_MASK;
43}
44#else
45static u8 ipvlan_get_v6_hash(const void *iaddr)
46{
47 return 0;
48}
49#endif
50
51static u8 ipvlan_get_v4_hash(const void *iaddr)
52{
53 const struct in_addr *ip4_addr = iaddr;
54
55 return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
56 IPVLAN_HASH_MASK;
57}
58
59static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
60{
61 if (!is_v6 && addr->atype == IPVL_IPV4) {
62 struct in_addr *i4addr = (struct in_addr *)iaddr;
63
64 return addr->ip4addr.s_addr == i4addr->s_addr;
65#if IS_ENABLED(CONFIG_IPV6)
66 } else if (is_v6 && addr->atype == IPVL_IPV6) {
67 struct in6_addr *i6addr = (struct in6_addr *)iaddr;
68
69 return ipv6_addr_equal(&addr->ip6addr, i6addr);
70#endif
71 }
72
73 return false;
74}
75
76static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
77 const void *iaddr, bool is_v6)
78{
79 struct ipvl_addr *addr;
80 u8 hash;
81
82 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
83 ipvlan_get_v4_hash(iaddr);
84 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
85 if (addr_equal(is_v6, addr, iaddr))
86 return addr;
87 return NULL;
88}
89
90void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
91{
92 struct ipvl_port *port = ipvlan->port;
93 u8 hash;
94
95 hash = (addr->atype == IPVL_IPV6) ?
96 ipvlan_get_v6_hash(&addr->ip6addr) :
97 ipvlan_get_v4_hash(&addr->ip4addr);
98 if (hlist_unhashed(&addr->hlnode))
99 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
100}
101
102void ipvlan_ht_addr_del(struct ipvl_addr *addr)
103{
104 hlist_del_init_rcu(&addr->hlnode);
105}
106
107struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
108 const void *iaddr, bool is_v6)
109{
110 struct ipvl_addr *addr, *ret = NULL;
111
112 rcu_read_lock();
113 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
114 if (addr_equal(is_v6, addr, iaddr)) {
115 ret = addr;
116 break;
117 }
118 }
119 rcu_read_unlock();
120 return ret;
121}
122
123bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
124{
125 struct ipvl_dev *ipvlan;
126 bool ret = false;
127
128 rcu_read_lock();
129 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
130 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
131 ret = true;
132 break;
133 }
134 }
135 rcu_read_unlock();
136 return ret;
137}
138
139void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
140{
141 void *lyr3h = NULL;
142
143 switch (skb->protocol) {
144 case htons(ETH_P_ARP): {
145 struct arphdr *arph;
146
147 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
148 return NULL;
149
150 arph = arp_hdr(skb);
151 *type = IPVL_ARP;
152 lyr3h = arph;
153 break;
154 }
155 case htons(ETH_P_IP): {
156 u32 pktlen;
157 struct iphdr *ip4h;
158
159 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
160 return NULL;
161
162 ip4h = ip_hdr(skb);
163 pktlen = skb_ip_totlen(skb);
164 if (ip4h->ihl < 5 || ip4h->version != 4)
165 return NULL;
166 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
167 return NULL;
168
169 *type = IPVL_IPV4;
170 lyr3h = ip4h;
171 break;
172 }
173#if IS_ENABLED(CONFIG_IPV6)
174 case htons(ETH_P_IPV6): {
175 struct ipv6hdr *ip6h;
176
177 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
178 return NULL;
179
180 ip6h = ipv6_hdr(skb);
181 if (ip6h->version != 6)
182 return NULL;
183
184 *type = IPVL_IPV6;
185 lyr3h = ip6h;
186 /* Only Neighbour Solicitation pkts need different treatment */
187 if (ipv6_addr_any(&ip6h->saddr) &&
188 ip6h->nexthdr == NEXTHDR_ICMP) {
189 struct icmp6hdr *icmph;
190
191 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
192 return NULL;
193
194 ip6h = ipv6_hdr(skb);
195 icmph = (struct icmp6hdr *)(ip6h + 1);
196
197 if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
198 /* Need to access the ipv6 address in body */
199 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
200 + sizeof(struct in6_addr))))
201 return NULL;
202
203 ip6h = ipv6_hdr(skb);
204 icmph = (struct icmp6hdr *)(ip6h + 1);
205 }
206
207 *type = IPVL_ICMPV6;
208 lyr3h = icmph;
209 }
210 break;
211 }
212#endif
213 default:
214 return NULL;
215 }
216
217 return lyr3h;
218}
219
220unsigned int ipvlan_mac_hash(const unsigned char *addr)
221{
222 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
223 ipvlan_jhash_secret);
224
225 return hash & IPVLAN_MAC_FILTER_MASK;
226}
227
228void ipvlan_process_multicast(struct work_struct *work)
229{
230 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
231 struct ethhdr *ethh;
232 struct ipvl_dev *ipvlan;
233 struct sk_buff *skb, *nskb;
234 struct sk_buff_head list;
235 unsigned int len;
236 unsigned int mac_hash;
237 int ret;
238 u8 pkt_type;
239 bool tx_pkt;
240
241 __skb_queue_head_init(&list);
242
243 spin_lock_bh(&port->backlog.lock);
244 skb_queue_splice_tail_init(&port->backlog, &list);
245 spin_unlock_bh(&port->backlog.lock);
246
247 while ((skb = __skb_dequeue(&list)) != NULL) {
248 struct net_device *dev = skb->dev;
249 bool consumed = false;
250
251 ethh = eth_hdr(skb);
252 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
253 mac_hash = ipvlan_mac_hash(ethh->h_dest);
254
255 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
256 pkt_type = PACKET_BROADCAST;
257 else
258 pkt_type = PACKET_MULTICAST;
259
260 rcu_read_lock();
261 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
262 if (tx_pkt && (ipvlan->dev == skb->dev))
263 continue;
264 if (!test_bit(mac_hash, ipvlan->mac_filters))
265 continue;
266 if (!(ipvlan->dev->flags & IFF_UP))
267 continue;
268 ret = NET_RX_DROP;
269 len = skb->len + ETH_HLEN;
270 nskb = skb_clone(skb, GFP_ATOMIC);
271 local_bh_disable();
272 if (nskb) {
273 consumed = true;
274 nskb->pkt_type = pkt_type;
275 nskb->dev = ipvlan->dev;
276 if (tx_pkt)
277 ret = dev_forward_skb(ipvlan->dev, nskb);
278 else
279 ret = netif_rx(nskb);
280 }
281 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
282 local_bh_enable();
283 }
284 rcu_read_unlock();
285
286 if (tx_pkt) {
287 /* If the packet originated here, send it out. */
288 skb->dev = port->dev;
289 skb->pkt_type = pkt_type;
290 dev_queue_xmit(skb);
291 } else {
292 if (consumed)
293 consume_skb(skb);
294 else
295 kfree_skb(skb);
296 }
297 dev_put(dev);
298 cond_resched();
299 }
300}
301
302static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
303{
304 bool xnet = true;
305
306 if (dev)
307 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
308
309 skb_scrub_packet(skb, xnet);
310 if (dev)
311 skb->dev = dev;
312}
313
314static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
315 bool local)
316{
317 struct ipvl_dev *ipvlan = addr->master;
318 struct net_device *dev = ipvlan->dev;
319 unsigned int len;
320 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
321 bool success = false;
322 struct sk_buff *skb = *pskb;
323
324 len = skb->len + ETH_HLEN;
325 /* Only packets exchanged between two local slaves need to have
326 * device-up check as well as skb-share check.
327 */
328 if (local) {
329 if (unlikely(!(dev->flags & IFF_UP))) {
330 kfree_skb(skb);
331 goto out;
332 }
333
334 skb = skb_share_check(skb, GFP_ATOMIC);
335 if (!skb)
336 goto out;
337
338 *pskb = skb;
339 }
340
341 if (local) {
342 skb->pkt_type = PACKET_HOST;
343 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
344 success = true;
345 } else {
346 skb->dev = dev;
347 ret = RX_HANDLER_ANOTHER;
348 success = true;
349 }
350
351out:
352 ipvlan_count_rx(ipvlan, len, success, false);
353 return ret;
354}
355
356struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
357 int addr_type, bool use_dest)
358{
359 struct ipvl_addr *addr = NULL;
360
361 switch (addr_type) {
362#if IS_ENABLED(CONFIG_IPV6)
363 case IPVL_IPV6: {
364 struct ipv6hdr *ip6h;
365 struct in6_addr *i6addr;
366
367 ip6h = (struct ipv6hdr *)lyr3h;
368 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
369 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
370 break;
371 }
372 case IPVL_ICMPV6: {
373 struct nd_msg *ndmh;
374 struct in6_addr *i6addr;
375
376 /* Make sure that the NeighborSolicitation ICMPv6 packets
377 * are handled to avoid DAD issue.
378 */
379 ndmh = (struct nd_msg *)lyr3h;
380 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
381 i6addr = &ndmh->target;
382 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
383 }
384 break;
385 }
386#endif
387 case IPVL_IPV4: {
388 struct iphdr *ip4h;
389 __be32 *i4addr;
390
391 ip4h = (struct iphdr *)lyr3h;
392 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
393 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
394 break;
395 }
396 case IPVL_ARP: {
397 struct arphdr *arph;
398 unsigned char *arp_ptr;
399 __be32 dip;
400
401 arph = (struct arphdr *)lyr3h;
402 arp_ptr = (unsigned char *)(arph + 1);
403 if (use_dest)
404 arp_ptr += (2 * port->dev->addr_len) + 4;
405 else
406 arp_ptr += port->dev->addr_len;
407
408 memcpy(&dip, arp_ptr, 4);
409 addr = ipvlan_ht_addr_lookup(port, &dip, false);
410 break;
411 }
412 }
413
414 return addr;
415}
416
417static noinline_for_stack int ipvlan_process_v4_outbound(struct sk_buff *skb)
418{
419 struct net_device *dev = skb->dev;
420 struct net *net = dev_net(dev);
421 int err, ret = NET_XMIT_DROP;
422 const struct iphdr *ip4h;
423 struct rtable *rt;
424 struct flowi4 fl4 = {
425 .flowi4_oif = dev->ifindex,
426 .flowi4_flags = FLOWI_FLAG_ANYSRC,
427 .flowi4_mark = skb->mark,
428 };
429
430 if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
431 goto err;
432
433 ip4h = ip_hdr(skb);
434 fl4.daddr = ip4h->daddr;
435 fl4.saddr = ip4h->saddr;
436 fl4.flowi4_tos = inet_dscp_to_dsfield(ip4h_dscp(ip4h));
437
438 rt = ip_route_output_flow(net, &fl4, NULL);
439 if (IS_ERR(rt))
440 goto err;
441
442 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
443 ip_rt_put(rt);
444 goto err;
445 }
446 skb_dst_set(skb, &rt->dst);
447
448 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
449
450 err = ip_local_out(net, NULL, skb);
451 if (unlikely(net_xmit_eval(err)))
452 DEV_STATS_INC(dev, tx_errors);
453 else
454 ret = NET_XMIT_SUCCESS;
455 goto out;
456err:
457 DEV_STATS_INC(dev, tx_errors);
458 kfree_skb(skb);
459out:
460 return ret;
461}
462
463#if IS_ENABLED(CONFIG_IPV6)
464
465static noinline_for_stack int
466ipvlan_route_v6_outbound(struct net_device *dev, struct sk_buff *skb)
467{
468 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
469 struct flowi6 fl6 = {
470 .flowi6_oif = dev->ifindex,
471 .daddr = ip6h->daddr,
472 .saddr = ip6h->saddr,
473 .flowi6_flags = FLOWI_FLAG_ANYSRC,
474 .flowlabel = ip6_flowinfo(ip6h),
475 .flowi6_mark = skb->mark,
476 .flowi6_proto = ip6h->nexthdr,
477 };
478 struct dst_entry *dst;
479 int err;
480
481 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
482 err = dst->error;
483 if (err) {
484 dst_release(dst);
485 return err;
486 }
487 skb_dst_set(skb, dst);
488 return 0;
489}
490
491static int ipvlan_process_v6_outbound(struct sk_buff *skb)
492{
493 struct net_device *dev = skb->dev;
494 int err, ret = NET_XMIT_DROP;
495
496 if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) {
497 DEV_STATS_INC(dev, tx_errors);
498 kfree_skb(skb);
499 return ret;
500 }
501
502 err = ipvlan_route_v6_outbound(dev, skb);
503 if (unlikely(err)) {
504 DEV_STATS_INC(dev, tx_errors);
505 kfree_skb(skb);
506 return err;
507 }
508
509 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
510
511 err = ip6_local_out(dev_net(dev), NULL, skb);
512 if (unlikely(net_xmit_eval(err)))
513 DEV_STATS_INC(dev, tx_errors);
514 else
515 ret = NET_XMIT_SUCCESS;
516 return ret;
517}
518#else
519static int ipvlan_process_v6_outbound(struct sk_buff *skb)
520{
521 return NET_XMIT_DROP;
522}
523#endif
524
525static int ipvlan_process_outbound(struct sk_buff *skb)
526{
527 int ret = NET_XMIT_DROP;
528
529 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
530 * will have L2; which need to discarded and processed further
531 * in the net-ns of the main-device.
532 */
533 if (skb_mac_header_was_set(skb)) {
534 /* In this mode we dont care about
535 * multicast and broadcast traffic */
536 struct ethhdr *ethh = eth_hdr(skb);
537
538 if (is_multicast_ether_addr(ethh->h_dest)) {
539 pr_debug_ratelimited(
540 "Dropped {multi|broad}cast of type=[%x]\n",
541 ntohs(skb->protocol));
542 kfree_skb(skb);
543 goto out;
544 }
545
546 skb_pull(skb, sizeof(*ethh));
547 skb->mac_header = (typeof(skb->mac_header))~0U;
548 skb_reset_network_header(skb);
549 }
550
551 if (skb->protocol == htons(ETH_P_IPV6))
552 ret = ipvlan_process_v6_outbound(skb);
553 else if (skb->protocol == htons(ETH_P_IP))
554 ret = ipvlan_process_v4_outbound(skb);
555 else {
556 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
557 ntohs(skb->protocol));
558 kfree_skb(skb);
559 }
560out:
561 return ret;
562}
563
564static void ipvlan_multicast_enqueue(struct ipvl_port *port,
565 struct sk_buff *skb, bool tx_pkt)
566{
567 if (skb->protocol == htons(ETH_P_PAUSE)) {
568 kfree_skb(skb);
569 return;
570 }
571
572 /* Record that the deferred packet is from TX or RX path. By
573 * looking at mac-addresses on packet will lead to erronus decisions.
574 * (This would be true for a loopback-mode on master device or a
575 * hair-pin mode of the switch.)
576 */
577 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
578
579 spin_lock(&port->backlog.lock);
580 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
581 dev_hold(skb->dev);
582 __skb_queue_tail(&port->backlog, skb);
583 spin_unlock(&port->backlog.lock);
584 schedule_work(&port->wq);
585 } else {
586 spin_unlock(&port->backlog.lock);
587 dev_core_stats_rx_dropped_inc(skb->dev);
588 kfree_skb(skb);
589 }
590}
591
592static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
593{
594 const struct ipvl_dev *ipvlan = netdev_priv(dev);
595 void *lyr3h;
596 struct ipvl_addr *addr;
597 int addr_type;
598
599 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
600 if (!lyr3h)
601 goto out;
602
603 if (!ipvlan_is_vepa(ipvlan->port)) {
604 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
605 if (addr) {
606 if (ipvlan_is_private(ipvlan->port)) {
607 consume_skb(skb);
608 return NET_XMIT_DROP;
609 }
610 ipvlan_rcv_frame(addr, &skb, true);
611 return NET_XMIT_SUCCESS;
612 }
613 }
614out:
615 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
616 return ipvlan_process_outbound(skb);
617}
618
619static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
620{
621 const struct ipvl_dev *ipvlan = netdev_priv(dev);
622 struct ethhdr *eth = skb_eth_hdr(skb);
623 struct ipvl_addr *addr;
624 void *lyr3h;
625 int addr_type;
626
627 if (!ipvlan_is_vepa(ipvlan->port) &&
628 ether_addr_equal(eth->h_dest, eth->h_source)) {
629 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
630 if (lyr3h) {
631 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
632 if (addr) {
633 if (ipvlan_is_private(ipvlan->port)) {
634 consume_skb(skb);
635 return NET_XMIT_DROP;
636 }
637 ipvlan_rcv_frame(addr, &skb, true);
638 return NET_XMIT_SUCCESS;
639 }
640 }
641 skb = skb_share_check(skb, GFP_ATOMIC);
642 if (!skb)
643 return NET_XMIT_DROP;
644
645 /* Packet definitely does not belong to any of the
646 * virtual devices, but the dest is local. So forward
647 * the skb for the main-dev. At the RX side we just return
648 * RX_PASS for it to be processed further on the stack.
649 */
650 dev_forward_skb(ipvlan->phy_dev, skb);
651 return NET_XMIT_SUCCESS;
652
653 } else if (is_multicast_ether_addr(eth->h_dest)) {
654 skb_reset_mac_header(skb);
655 ipvlan_skb_crossing_ns(skb, NULL);
656 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
657 return NET_XMIT_SUCCESS;
658 }
659
660 skb->dev = ipvlan->phy_dev;
661 return dev_queue_xmit(skb);
662}
663
664int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
665{
666 struct ipvl_dev *ipvlan = netdev_priv(dev);
667 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
668
669 if (!port)
670 goto out;
671
672 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
673 goto out;
674
675 switch(port->mode) {
676 case IPVLAN_MODE_L2:
677 return ipvlan_xmit_mode_l2(skb, dev);
678 case IPVLAN_MODE_L3:
679#ifdef CONFIG_IPVLAN_L3S
680 case IPVLAN_MODE_L3S:
681#endif
682 return ipvlan_xmit_mode_l3(skb, dev);
683 }
684
685 /* Should not reach here */
686 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
687out:
688 kfree_skb(skb);
689 return NET_XMIT_DROP;
690}
691
692static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
693{
694 struct ethhdr *eth = eth_hdr(skb);
695 struct ipvl_addr *addr;
696 void *lyr3h;
697 int addr_type;
698
699 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
700 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
701 if (!lyr3h)
702 return true;
703
704 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
705 if (addr)
706 return false;
707 }
708
709 return true;
710}
711
712static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
713 struct ipvl_port *port)
714{
715 void *lyr3h;
716 int addr_type;
717 struct ipvl_addr *addr;
718 struct sk_buff *skb = *pskb;
719 rx_handler_result_t ret = RX_HANDLER_PASS;
720
721 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
722 if (!lyr3h)
723 goto out;
724
725 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
726 if (addr)
727 ret = ipvlan_rcv_frame(addr, pskb, false);
728
729out:
730 return ret;
731}
732
733static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
734 struct ipvl_port *port)
735{
736 struct sk_buff *skb = *pskb;
737 struct ethhdr *eth = eth_hdr(skb);
738 rx_handler_result_t ret = RX_HANDLER_PASS;
739
740 if (is_multicast_ether_addr(eth->h_dest)) {
741 if (ipvlan_external_frame(skb, port)) {
742 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
743
744 /* External frames are queued for device local
745 * distribution, but a copy is given to master
746 * straight away to avoid sending duplicates later
747 * when work-queue processes this frame. This is
748 * achieved by returning RX_HANDLER_PASS.
749 */
750 if (nskb) {
751 ipvlan_skb_crossing_ns(nskb, NULL);
752 ipvlan_multicast_enqueue(port, nskb, false);
753 }
754 }
755 } else {
756 /* Perform like l3 mode for non-multicast packet */
757 ret = ipvlan_handle_mode_l3(pskb, port);
758 }
759
760 return ret;
761}
762
763rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
764{
765 struct sk_buff *skb = *pskb;
766 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
767
768 if (!port)
769 return RX_HANDLER_PASS;
770
771 switch (port->mode) {
772 case IPVLAN_MODE_L2:
773 return ipvlan_handle_mode_l2(pskb, port);
774 case IPVLAN_MODE_L3:
775 return ipvlan_handle_mode_l3(pskb, port);
776#ifdef CONFIG_IPVLAN_L3S
777 case IPVLAN_MODE_L3S:
778 return RX_HANDLER_PASS;
779#endif
780 }
781
782 /* Should not reach here */
783 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
784 kfree_skb(skb);
785 return RX_HANDLER_CONSUMED;
786}