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 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 }
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 = 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
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 dev_put(dev);
295 cond_resched();
296 }
297 }
298
ipvlan_skb_crossing_ns(struct sk_buff * skb,struct net_device * dev)299 static 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
ipvlan_rcv_frame(struct ipvl_addr * addr,struct sk_buff ** pskb,bool local)311 static 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
348 out:
349 ipvlan_count_rx(ipvlan, len, success, false);
350 return ret;
351 }
352
ipvlan_addr_lookup(struct ipvl_port * port,void * lyr3h,int addr_type,bool use_dest)353 struct 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
ipvlan_process_v4_outbound(struct sk_buff * skb)414 static 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, NULL, 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;
448 err:
449 DEV_STATS_INC(dev, tx_errors);
450 kfree_skb(skb);
451 out:
452 return ret;
453 }
454
455 #if IS_ENABLED(CONFIG_IPV6)
456
457 static noinline_for_stack int
ipvlan_route_v6_outbound(struct net_device * dev,struct sk_buff * skb)458 ipvlan_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
ipvlan_process_v6_outbound(struct sk_buff * skb)483 static 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), NULL, 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
ipvlan_process_v6_outbound(struct sk_buff * skb)505 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
506 {
507 return NET_XMIT_DROP;
508 }
509 #endif
510
ipvlan_process_outbound(struct sk_buff * skb)511 static 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 }
546 out:
547 return ret;
548 }
549
ipvlan_multicast_enqueue(struct ipvl_port * port,struct sk_buff * skb,bool tx_pkt)550 static 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
ipvlan_xmit_mode_l3(struct sk_buff * skb,struct net_device * dev)578 static 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 }
600 out:
601 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
602 return ipvlan_process_outbound(skb);
603 }
604
ipvlan_xmit_mode_l2(struct sk_buff * skb,struct net_device * dev)605 static 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
ipvlan_queue_xmit(struct sk_buff * skb,struct net_device * dev)650 int 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);
673 out:
674 kfree_skb(skb);
675 return NET_XMIT_DROP;
676 }
677
ipvlan_external_frame(struct sk_buff * skb,struct ipvl_port * port)678 static 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
ipvlan_handle_mode_l3(struct sk_buff ** pskb,struct ipvl_port * port)698 static 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
715 out:
716 return ret;
717 }
718
ipvlan_handle_mode_l2(struct sk_buff ** pskb,struct ipvl_port * port)719 static 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
ipvlan_handle_frame(struct sk_buff ** pskb)749 rx_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 }
773