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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 u64_stats_inc(&pcptr->rx_pkts);
23 u64_stats_add(&pcptr->rx_bytes, len);
24 if (mcast)
25 u64_stats_inc(&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 = skb_ip_totlen(skb);
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 dev_put(dev);
295 cond_resched();
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 noinline_for_stack 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
440 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
441
442 err = ip_local_out(net, skb->sk, skb);
443 if (unlikely(net_xmit_eval(err)))
444 DEV_STATS_INC(dev, tx_errors);
445 else
446 ret = NET_XMIT_SUCCESS;
447 goto out;
448err:
449 DEV_STATS_INC(dev, tx_errors);
450 kfree_skb(skb);
451out:
452 return ret;
453}
454
455#if IS_ENABLED(CONFIG_IPV6)
456
457static noinline_for_stack int
458ipvlan_route_v6_outbound(struct net_device *dev, struct sk_buff *skb)
459{
460 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
461 struct flowi6 fl6 = {
462 .flowi6_oif = dev->ifindex,
463 .daddr = ip6h->daddr,
464 .saddr = ip6h->saddr,
465 .flowi6_flags = FLOWI_FLAG_ANYSRC,
466 .flowlabel = ip6_flowinfo(ip6h),
467 .flowi6_mark = skb->mark,
468 .flowi6_proto = ip6h->nexthdr,
469 };
470 struct dst_entry *dst;
471 int err;
472
473 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
474 err = dst->error;
475 if (err) {
476 dst_release(dst);
477 return err;
478 }
479 skb_dst_set(skb, dst);
480 return 0;
481}
482
483static int ipvlan_process_v6_outbound(struct sk_buff *skb)
484{
485 struct net_device *dev = skb->dev;
486 int err, ret = NET_XMIT_DROP;
487
488 err = ipvlan_route_v6_outbound(dev, skb);
489 if (unlikely(err)) {
490 DEV_STATS_INC(dev, tx_errors);
491 kfree_skb(skb);
492 return err;
493 }
494
495 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
496
497 err = ip6_local_out(dev_net(dev), skb->sk, skb);
498 if (unlikely(net_xmit_eval(err)))
499 DEV_STATS_INC(dev, tx_errors);
500 else
501 ret = NET_XMIT_SUCCESS;
502 return ret;
503}
504#else
505static int ipvlan_process_v6_outbound(struct sk_buff *skb)
506{
507 return NET_XMIT_DROP;
508}
509#endif
510
511static int ipvlan_process_outbound(struct sk_buff *skb)
512{
513 int ret = NET_XMIT_DROP;
514
515 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
516 * will have L2; which need to discarded and processed further
517 * in the net-ns of the main-device.
518 */
519 if (skb_mac_header_was_set(skb)) {
520 /* In this mode we dont care about
521 * multicast and broadcast traffic */
522 struct ethhdr *ethh = eth_hdr(skb);
523
524 if (is_multicast_ether_addr(ethh->h_dest)) {
525 pr_debug_ratelimited(
526 "Dropped {multi|broad}cast of type=[%x]\n",
527 ntohs(skb->protocol));
528 kfree_skb(skb);
529 goto out;
530 }
531
532 skb_pull(skb, sizeof(*ethh));
533 skb->mac_header = (typeof(skb->mac_header))~0U;
534 skb_reset_network_header(skb);
535 }
536
537 if (skb->protocol == htons(ETH_P_IPV6))
538 ret = ipvlan_process_v6_outbound(skb);
539 else if (skb->protocol == htons(ETH_P_IP))
540 ret = ipvlan_process_v4_outbound(skb);
541 else {
542 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
543 ntohs(skb->protocol));
544 kfree_skb(skb);
545 }
546out:
547 return ret;
548}
549
550static void ipvlan_multicast_enqueue(struct ipvl_port *port,
551 struct sk_buff *skb, bool tx_pkt)
552{
553 if (skb->protocol == htons(ETH_P_PAUSE)) {
554 kfree_skb(skb);
555 return;
556 }
557
558 /* Record that the deferred packet is from TX or RX path. By
559 * looking at mac-addresses on packet will lead to erronus decisions.
560 * (This would be true for a loopback-mode on master device or a
561 * hair-pin mode of the switch.)
562 */
563 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
564
565 spin_lock(&port->backlog.lock);
566 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
567 dev_hold(skb->dev);
568 __skb_queue_tail(&port->backlog, skb);
569 spin_unlock(&port->backlog.lock);
570 schedule_work(&port->wq);
571 } else {
572 spin_unlock(&port->backlog.lock);
573 dev_core_stats_rx_dropped_inc(skb->dev);
574 kfree_skb(skb);
575 }
576}
577
578static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
579{
580 const struct ipvl_dev *ipvlan = netdev_priv(dev);
581 void *lyr3h;
582 struct ipvl_addr *addr;
583 int addr_type;
584
585 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
586 if (!lyr3h)
587 goto out;
588
589 if (!ipvlan_is_vepa(ipvlan->port)) {
590 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
591 if (addr) {
592 if (ipvlan_is_private(ipvlan->port)) {
593 consume_skb(skb);
594 return NET_XMIT_DROP;
595 }
596 ipvlan_rcv_frame(addr, &skb, true);
597 return NET_XMIT_SUCCESS;
598 }
599 }
600out:
601 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
602 return ipvlan_process_outbound(skb);
603}
604
605static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
606{
607 const struct ipvl_dev *ipvlan = netdev_priv(dev);
608 struct ethhdr *eth = skb_eth_hdr(skb);
609 struct ipvl_addr *addr;
610 void *lyr3h;
611 int addr_type;
612
613 if (!ipvlan_is_vepa(ipvlan->port) &&
614 ether_addr_equal(eth->h_dest, eth->h_source)) {
615 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
616 if (lyr3h) {
617 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
618 if (addr) {
619 if (ipvlan_is_private(ipvlan->port)) {
620 consume_skb(skb);
621 return NET_XMIT_DROP;
622 }
623 ipvlan_rcv_frame(addr, &skb, true);
624 return NET_XMIT_SUCCESS;
625 }
626 }
627 skb = skb_share_check(skb, GFP_ATOMIC);
628 if (!skb)
629 return NET_XMIT_DROP;
630
631 /* Packet definitely does not belong to any of the
632 * virtual devices, but the dest is local. So forward
633 * the skb for the main-dev. At the RX side we just return
634 * RX_PASS for it to be processed further on the stack.
635 */
636 dev_forward_skb(ipvlan->phy_dev, skb);
637 return NET_XMIT_SUCCESS;
638
639 } else if (is_multicast_ether_addr(eth->h_dest)) {
640 skb_reset_mac_header(skb);
641 ipvlan_skb_crossing_ns(skb, NULL);
642 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
643 return NET_XMIT_SUCCESS;
644 }
645
646 skb->dev = ipvlan->phy_dev;
647 return dev_queue_xmit(skb);
648}
649
650int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
651{
652 struct ipvl_dev *ipvlan = netdev_priv(dev);
653 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
654
655 if (!port)
656 goto out;
657
658 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
659 goto out;
660
661 switch(port->mode) {
662 case IPVLAN_MODE_L2:
663 return ipvlan_xmit_mode_l2(skb, dev);
664 case IPVLAN_MODE_L3:
665#ifdef CONFIG_IPVLAN_L3S
666 case IPVLAN_MODE_L3S:
667#endif
668 return ipvlan_xmit_mode_l3(skb, dev);
669 }
670
671 /* Should not reach here */
672 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
673out:
674 kfree_skb(skb);
675 return NET_XMIT_DROP;
676}
677
678static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
679{
680 struct ethhdr *eth = eth_hdr(skb);
681 struct ipvl_addr *addr;
682 void *lyr3h;
683 int addr_type;
684
685 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
686 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
687 if (!lyr3h)
688 return true;
689
690 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
691 if (addr)
692 return false;
693 }
694
695 return true;
696}
697
698static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
699 struct ipvl_port *port)
700{
701 void *lyr3h;
702 int addr_type;
703 struct ipvl_addr *addr;
704 struct sk_buff *skb = *pskb;
705 rx_handler_result_t ret = RX_HANDLER_PASS;
706
707 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
708 if (!lyr3h)
709 goto out;
710
711 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
712 if (addr)
713 ret = ipvlan_rcv_frame(addr, pskb, false);
714
715out:
716 return ret;
717}
718
719static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
720 struct ipvl_port *port)
721{
722 struct sk_buff *skb = *pskb;
723 struct ethhdr *eth = eth_hdr(skb);
724 rx_handler_result_t ret = RX_HANDLER_PASS;
725
726 if (is_multicast_ether_addr(eth->h_dest)) {
727 if (ipvlan_external_frame(skb, port)) {
728 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
729
730 /* External frames are queued for device local
731 * distribution, but a copy is given to master
732 * straight away to avoid sending duplicates later
733 * when work-queue processes this frame. This is
734 * achieved by returning RX_HANDLER_PASS.
735 */
736 if (nskb) {
737 ipvlan_skb_crossing_ns(nskb, NULL);
738 ipvlan_multicast_enqueue(port, nskb, false);
739 }
740 }
741 } else {
742 /* Perform like l3 mode for non-multicast packet */
743 ret = ipvlan_handle_mode_l3(pskb, port);
744 }
745
746 return ret;
747}
748
749rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
750{
751 struct sk_buff *skb = *pskb;
752 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
753
754 if (!port)
755 return RX_HANDLER_PASS;
756
757 switch (port->mode) {
758 case IPVLAN_MODE_L2:
759 return ipvlan_handle_mode_l2(pskb, port);
760 case IPVLAN_MODE_L3:
761 return ipvlan_handle_mode_l3(pskb, port);
762#ifdef CONFIG_IPVLAN_L3S
763 case IPVLAN_MODE_L3S:
764 return RX_HANDLER_PASS;
765#endif
766 }
767
768 /* Should not reach here */
769 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
770 kfree_skb(skb);
771 return RX_HANDLER_CONSUMED;
772}
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}