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
10 static u32 ipvlan_jhash_secret __read_mostly;
11
ipvlan_init_secret(void)12 void ipvlan_init_secret(void)
13 {
14 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
15 }
16
ipvlan_count_rx(const struct ipvl_dev * ipvlan,unsigned int len,bool success,bool mcast)17 void 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 }
34 EXPORT_SYMBOL_GPL(ipvlan_count_rx);
35
36 #if IS_ENABLED(CONFIG_IPV6)
ipvlan_get_v6_hash(const void * iaddr)37 static 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
ipvlan_get_v6_hash(const void * iaddr)45 static u8 ipvlan_get_v6_hash(const void *iaddr)
46 {
47 return 0;
48 }
49 #endif
50
ipvlan_get_v4_hash(const void * iaddr)51 static 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
addr_equal(bool is_v6,struct ipvl_addr * addr,const void * iaddr)59 static 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
ipvlan_ht_addr_lookup(const struct ipvl_port * port,const void * iaddr,bool is_v6)76 static 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
ipvlan_ht_addr_add(struct ipvl_dev * ipvlan,struct ipvl_addr * addr)90 void 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
ipvlan_ht_addr_del(struct ipvl_addr * addr)102 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
103 {
104 hlist_del_init_rcu(&addr->hlnode);
105 }
106
ipvlan_find_addr(const struct ipvl_dev * ipvlan,const void * iaddr,bool is_v6)107 struct 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
ipvlan_addr_busy(struct ipvl_port * port,void * iaddr,bool is_v6)123 bool 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
ipvlan_get_L3_hdr(struct ipvl_port * port,struct sk_buff * skb,int * type)139 void *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
ipvlan_mac_hash(const unsigned char * addr)220 unsigned 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
ipvlan_process_multicast(struct work_struct * work)228 void 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
ipvlan_skb_crossing_ns(struct sk_buff * skb,struct net_device * dev)302 static 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
ipvlan_rcv_frame(struct ipvl_addr * addr,struct sk_buff ** pskb,bool local)314 static 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
351 out:
352 ipvlan_count_rx(ipvlan, len, success, false);
353 return ret;
354 }
355
ipvlan_addr_lookup(struct ipvl_port * port,void * lyr3h,int addr_type,bool use_dest)356 struct 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
ipvlan_process_v4_outbound(struct sk_buff * skb)417 static noinline_for_stack int ipvlan_process_v4_outbound(struct sk_buff *skb)
418 {
419 const struct iphdr *ip4h = ip_hdr(skb);
420 struct net_device *dev = skb->dev;
421 struct net *net = dev_net(dev);
422 struct rtable *rt;
423 int err, ret = NET_XMIT_DROP;
424 struct flowi4 fl4 = {
425 .flowi4_oif = dev->ifindex,
426 .flowi4_tos = inet_dscp_to_dsfield(ip4h_dscp(ip4h)),
427 .flowi4_flags = FLOWI_FLAG_ANYSRC,
428 .flowi4_mark = skb->mark,
429 .daddr = ip4h->daddr,
430 .saddr = ip4h->saddr,
431 };
432
433 rt = ip_route_output_flow(net, &fl4, NULL);
434 if (IS_ERR(rt))
435 goto err;
436
437 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
438 ip_rt_put(rt);
439 goto err;
440 }
441 skb_dst_set(skb, &rt->dst);
442
443 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
444
445 err = ip_local_out(net, NULL, skb);
446 if (unlikely(net_xmit_eval(err)))
447 DEV_STATS_INC(dev, tx_errors);
448 else
449 ret = NET_XMIT_SUCCESS;
450 goto out;
451 err:
452 DEV_STATS_INC(dev, tx_errors);
453 kfree_skb(skb);
454 out:
455 return ret;
456 }
457
458 #if IS_ENABLED(CONFIG_IPV6)
459
460 static noinline_for_stack int
ipvlan_route_v6_outbound(struct net_device * dev,struct sk_buff * skb)461 ipvlan_route_v6_outbound(struct net_device *dev, struct sk_buff *skb)
462 {
463 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
464 struct flowi6 fl6 = {
465 .flowi6_oif = dev->ifindex,
466 .daddr = ip6h->daddr,
467 .saddr = ip6h->saddr,
468 .flowi6_flags = FLOWI_FLAG_ANYSRC,
469 .flowlabel = ip6_flowinfo(ip6h),
470 .flowi6_mark = skb->mark,
471 .flowi6_proto = ip6h->nexthdr,
472 };
473 struct dst_entry *dst;
474 int err;
475
476 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
477 err = dst->error;
478 if (err) {
479 dst_release(dst);
480 return err;
481 }
482 skb_dst_set(skb, dst);
483 return 0;
484 }
485
ipvlan_process_v6_outbound(struct sk_buff * skb)486 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
487 {
488 struct net_device *dev = skb->dev;
489 int err, ret = NET_XMIT_DROP;
490
491 err = ipvlan_route_v6_outbound(dev, skb);
492 if (unlikely(err)) {
493 DEV_STATS_INC(dev, tx_errors);
494 kfree_skb(skb);
495 return err;
496 }
497
498 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
499
500 err = ip6_local_out(dev_net(dev), NULL, skb);
501 if (unlikely(net_xmit_eval(err)))
502 DEV_STATS_INC(dev, tx_errors);
503 else
504 ret = NET_XMIT_SUCCESS;
505 return ret;
506 }
507 #else
ipvlan_process_v6_outbound(struct sk_buff * skb)508 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
509 {
510 return NET_XMIT_DROP;
511 }
512 #endif
513
ipvlan_process_outbound(struct sk_buff * skb)514 static int ipvlan_process_outbound(struct sk_buff *skb)
515 {
516 int ret = NET_XMIT_DROP;
517
518 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
519 * will have L2; which need to discarded and processed further
520 * in the net-ns of the main-device.
521 */
522 if (skb_mac_header_was_set(skb)) {
523 /* In this mode we dont care about
524 * multicast and broadcast traffic */
525 struct ethhdr *ethh = eth_hdr(skb);
526
527 if (is_multicast_ether_addr(ethh->h_dest)) {
528 pr_debug_ratelimited(
529 "Dropped {multi|broad}cast of type=[%x]\n",
530 ntohs(skb->protocol));
531 kfree_skb(skb);
532 goto out;
533 }
534
535 skb_pull(skb, sizeof(*ethh));
536 skb->mac_header = (typeof(skb->mac_header))~0U;
537 skb_reset_network_header(skb);
538 }
539
540 if (skb->protocol == htons(ETH_P_IPV6))
541 ret = ipvlan_process_v6_outbound(skb);
542 else if (skb->protocol == htons(ETH_P_IP))
543 ret = ipvlan_process_v4_outbound(skb);
544 else {
545 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
546 ntohs(skb->protocol));
547 kfree_skb(skb);
548 }
549 out:
550 return ret;
551 }
552
ipvlan_multicast_enqueue(struct ipvl_port * port,struct sk_buff * skb,bool tx_pkt)553 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
554 struct sk_buff *skb, bool tx_pkt)
555 {
556 if (skb->protocol == htons(ETH_P_PAUSE)) {
557 kfree_skb(skb);
558 return;
559 }
560
561 /* Record that the deferred packet is from TX or RX path. By
562 * looking at mac-addresses on packet will lead to erronus decisions.
563 * (This would be true for a loopback-mode on master device or a
564 * hair-pin mode of the switch.)
565 */
566 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
567
568 spin_lock(&port->backlog.lock);
569 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
570 dev_hold(skb->dev);
571 __skb_queue_tail(&port->backlog, skb);
572 spin_unlock(&port->backlog.lock);
573 schedule_work(&port->wq);
574 } else {
575 spin_unlock(&port->backlog.lock);
576 dev_core_stats_rx_dropped_inc(skb->dev);
577 kfree_skb(skb);
578 }
579 }
580
ipvlan_xmit_mode_l3(struct sk_buff * skb,struct net_device * dev)581 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
582 {
583 const struct ipvl_dev *ipvlan = netdev_priv(dev);
584 void *lyr3h;
585 struct ipvl_addr *addr;
586 int addr_type;
587
588 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
589 if (!lyr3h)
590 goto out;
591
592 if (!ipvlan_is_vepa(ipvlan->port)) {
593 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
594 if (addr) {
595 if (ipvlan_is_private(ipvlan->port)) {
596 consume_skb(skb);
597 return NET_XMIT_DROP;
598 }
599 ipvlan_rcv_frame(addr, &skb, true);
600 return NET_XMIT_SUCCESS;
601 }
602 }
603 out:
604 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
605 return ipvlan_process_outbound(skb);
606 }
607
ipvlan_xmit_mode_l2(struct sk_buff * skb,struct net_device * dev)608 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
609 {
610 const struct ipvl_dev *ipvlan = netdev_priv(dev);
611 struct ethhdr *eth = skb_eth_hdr(skb);
612 struct ipvl_addr *addr;
613 void *lyr3h;
614 int addr_type;
615
616 if (!ipvlan_is_vepa(ipvlan->port) &&
617 ether_addr_equal(eth->h_dest, eth->h_source)) {
618 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
619 if (lyr3h) {
620 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
621 if (addr) {
622 if (ipvlan_is_private(ipvlan->port)) {
623 consume_skb(skb);
624 return NET_XMIT_DROP;
625 }
626 ipvlan_rcv_frame(addr, &skb, true);
627 return NET_XMIT_SUCCESS;
628 }
629 }
630 skb = skb_share_check(skb, GFP_ATOMIC);
631 if (!skb)
632 return NET_XMIT_DROP;
633
634 /* Packet definitely does not belong to any of the
635 * virtual devices, but the dest is local. So forward
636 * the skb for the main-dev. At the RX side we just return
637 * RX_PASS for it to be processed further on the stack.
638 */
639 dev_forward_skb(ipvlan->phy_dev, skb);
640 return NET_XMIT_SUCCESS;
641
642 } else if (is_multicast_ether_addr(eth->h_dest)) {
643 skb_reset_mac_header(skb);
644 ipvlan_skb_crossing_ns(skb, NULL);
645 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
646 return NET_XMIT_SUCCESS;
647 }
648
649 skb->dev = ipvlan->phy_dev;
650 return dev_queue_xmit(skb);
651 }
652
ipvlan_queue_xmit(struct sk_buff * skb,struct net_device * dev)653 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
654 {
655 struct ipvl_dev *ipvlan = netdev_priv(dev);
656 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
657
658 if (!port)
659 goto out;
660
661 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
662 goto out;
663
664 switch(port->mode) {
665 case IPVLAN_MODE_L2:
666 return ipvlan_xmit_mode_l2(skb, dev);
667 case IPVLAN_MODE_L3:
668 #ifdef CONFIG_IPVLAN_L3S
669 case IPVLAN_MODE_L3S:
670 #endif
671 return ipvlan_xmit_mode_l3(skb, dev);
672 }
673
674 /* Should not reach here */
675 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
676 out:
677 kfree_skb(skb);
678 return NET_XMIT_DROP;
679 }
680
ipvlan_external_frame(struct sk_buff * skb,struct ipvl_port * port)681 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
682 {
683 struct ethhdr *eth = eth_hdr(skb);
684 struct ipvl_addr *addr;
685 void *lyr3h;
686 int addr_type;
687
688 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
689 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
690 if (!lyr3h)
691 return true;
692
693 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
694 if (addr)
695 return false;
696 }
697
698 return true;
699 }
700
ipvlan_handle_mode_l3(struct sk_buff ** pskb,struct ipvl_port * port)701 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
702 struct ipvl_port *port)
703 {
704 void *lyr3h;
705 int addr_type;
706 struct ipvl_addr *addr;
707 struct sk_buff *skb = *pskb;
708 rx_handler_result_t ret = RX_HANDLER_PASS;
709
710 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
711 if (!lyr3h)
712 goto out;
713
714 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
715 if (addr)
716 ret = ipvlan_rcv_frame(addr, pskb, false);
717
718 out:
719 return ret;
720 }
721
ipvlan_handle_mode_l2(struct sk_buff ** pskb,struct ipvl_port * port)722 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
723 struct ipvl_port *port)
724 {
725 struct sk_buff *skb = *pskb;
726 struct ethhdr *eth = eth_hdr(skb);
727 rx_handler_result_t ret = RX_HANDLER_PASS;
728
729 if (is_multicast_ether_addr(eth->h_dest)) {
730 if (ipvlan_external_frame(skb, port)) {
731 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
732
733 /* External frames are queued for device local
734 * distribution, but a copy is given to master
735 * straight away to avoid sending duplicates later
736 * when work-queue processes this frame. This is
737 * achieved by returning RX_HANDLER_PASS.
738 */
739 if (nskb) {
740 ipvlan_skb_crossing_ns(nskb, NULL);
741 ipvlan_multicast_enqueue(port, nskb, false);
742 }
743 }
744 } else {
745 /* Perform like l3 mode for non-multicast packet */
746 ret = ipvlan_handle_mode_l3(pskb, port);
747 }
748
749 return ret;
750 }
751
ipvlan_handle_frame(struct sk_buff ** pskb)752 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
753 {
754 struct sk_buff *skb = *pskb;
755 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
756
757 if (!port)
758 return RX_HANDLER_PASS;
759
760 switch (port->mode) {
761 case IPVLAN_MODE_L2:
762 return ipvlan_handle_mode_l2(pskb, port);
763 case IPVLAN_MODE_L3:
764 return ipvlan_handle_mode_l3(pskb, port);
765 #ifdef CONFIG_IPVLAN_L3S
766 case IPVLAN_MODE_L3S:
767 return RX_HANDLER_PASS;
768 #endif
769 }
770
771 /* Should not reach here */
772 WARN_ONCE(true, "%s called for mode = [%x]\n", __func__, port->mode);
773 kfree_skb(skb);
774 return RX_HANDLER_CONSUMED;
775 }
776