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