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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// 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}