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10#include "ipvlan.h"
11
12static u32 ipvlan_jhash_secret __read_mostly;
13
14void ipvlan_init_secret(void)
15{
16 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
17}
18
19static void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
20 unsigned int len, bool success, bool mcast)
21{
22 if (!ipvlan)
23 return;
24
25 if (likely(success)) {
26 struct ipvl_pcpu_stats *pcptr;
27
28 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
29 u64_stats_update_begin(&pcptr->syncp);
30 pcptr->rx_pkts++;
31 pcptr->rx_bytes += len;
32 if (mcast)
33 pcptr->rx_mcast++;
34 u64_stats_update_end(&pcptr->syncp);
35 } else {
36 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
37 }
38}
39
40static u8 ipvlan_get_v6_hash(const void *iaddr)
41{
42 const struct in6_addr *ip6_addr = iaddr;
43
44 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
45 IPVLAN_HASH_MASK;
46}
47
48static u8 ipvlan_get_v4_hash(const void *iaddr)
49{
50 const struct in_addr *ip4_addr = iaddr;
51
52 return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
53 IPVLAN_HASH_MASK;
54}
55
56struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
57 const void *iaddr, bool is_v6)
58{
59 struct ipvl_addr *addr;
60 u8 hash;
61
62 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
63 ipvlan_get_v4_hash(iaddr);
64 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) {
65 if (is_v6 && addr->atype == IPVL_IPV6 &&
66 ipv6_addr_equal(&addr->ip6addr, iaddr))
67 return addr;
68 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
69 addr->ip4addr.s_addr ==
70 ((struct in_addr *)iaddr)->s_addr)
71 return addr;
72 }
73 return NULL;
74}
75
76void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
77{
78 struct ipvl_port *port = ipvlan->port;
79 u8 hash;
80
81 hash = (addr->atype == IPVL_IPV6) ?
82 ipvlan_get_v6_hash(&addr->ip6addr) :
83 ipvlan_get_v4_hash(&addr->ip4addr);
84 if (hlist_unhashed(&addr->hlnode))
85 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
86}
87
88void ipvlan_ht_addr_del(struct ipvl_addr *addr)
89{
90 hlist_del_init_rcu(&addr->hlnode);
91}
92
93struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
94 const void *iaddr, bool is_v6)
95{
96 struct ipvl_addr *addr;
97
98 list_for_each_entry(addr, &ipvlan->addrs, anode) {
99 if ((is_v6 && addr->atype == IPVL_IPV6 &&
100 ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
101 (!is_v6 && addr->atype == IPVL_IPV4 &&
102 addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
103 return addr;
104 }
105 return NULL;
106}
107
108bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
109{
110 struct ipvl_dev *ipvlan;
111
112 ASSERT_RTNL();
113
114 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
115 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
116 return true;
117 }
118 return false;
119}
120
121static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
122{
123 void *lyr3h = NULL;
124
125 switch (skb->protocol) {
126 case htons(ETH_P_ARP): {
127 struct arphdr *arph;
128
129 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
130 return NULL;
131
132 arph = arp_hdr(skb);
133 *type = IPVL_ARP;
134 lyr3h = arph;
135 break;
136 }
137 case htons(ETH_P_IP): {
138 u32 pktlen;
139 struct iphdr *ip4h;
140
141 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
142 return NULL;
143
144 ip4h = ip_hdr(skb);
145 pktlen = ntohs(ip4h->tot_len);
146 if (ip4h->ihl < 5 || ip4h->version != 4)
147 return NULL;
148 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
149 return NULL;
150
151 *type = IPVL_IPV4;
152 lyr3h = ip4h;
153 break;
154 }
155 case htons(ETH_P_IPV6): {
156 struct ipv6hdr *ip6h;
157
158 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
159 return NULL;
160
161 ip6h = ipv6_hdr(skb);
162 if (ip6h->version != 6)
163 return NULL;
164
165 *type = IPVL_IPV6;
166 lyr3h = ip6h;
167
168 if (ipv6_addr_any(&ip6h->saddr) &&
169 ip6h->nexthdr == NEXTHDR_ICMP) {
170 *type = IPVL_ICMPV6;
171 lyr3h = ip6h + 1;
172 }
173 break;
174 }
175 default:
176 return NULL;
177 }
178
179 return lyr3h;
180}
181
182unsigned int ipvlan_mac_hash(const unsigned char *addr)
183{
184 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
185 ipvlan_jhash_secret);
186
187 return hash & IPVLAN_MAC_FILTER_MASK;
188}
189
190void ipvlan_process_multicast(struct work_struct *work)
191{
192 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
193 struct ethhdr *ethh;
194 struct ipvl_dev *ipvlan;
195 struct sk_buff *skb, *nskb;
196 struct sk_buff_head list;
197 unsigned int len;
198 unsigned int mac_hash;
199 int ret;
200 u8 pkt_type;
201 bool hlocal, dlocal;
202
203 __skb_queue_head_init(&list);
204
205 spin_lock_bh(&port->backlog.lock);
206 skb_queue_splice_tail_init(&port->backlog, &list);
207 spin_unlock_bh(&port->backlog.lock);
208
209 while ((skb = __skb_dequeue(&list)) != NULL) {
210 ethh = eth_hdr(skb);
211 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
212 mac_hash = ipvlan_mac_hash(ethh->h_dest);
213
214 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
215 pkt_type = PACKET_BROADCAST;
216 else
217 pkt_type = PACKET_MULTICAST;
218
219 dlocal = false;
220 rcu_read_lock();
221 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
222 if (hlocal && (ipvlan->dev == skb->dev)) {
223 dlocal = true;
224 continue;
225 }
226 if (!test_bit(mac_hash, ipvlan->mac_filters))
227 continue;
228
229 ret = NET_RX_DROP;
230 len = skb->len + ETH_HLEN;
231 nskb = skb_clone(skb, GFP_ATOMIC);
232 if (!nskb)
233 goto acct;
234
235 nskb->pkt_type = pkt_type;
236 nskb->dev = ipvlan->dev;
237 if (hlocal)
238 ret = dev_forward_skb(ipvlan->dev, nskb);
239 else
240 ret = netif_rx(nskb);
241acct:
242 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
243 }
244 rcu_read_unlock();
245
246 if (dlocal) {
247
248 skb->dev = port->dev;
249 skb->pkt_type = pkt_type;
250 dev_queue_xmit(skb);
251 } else {
252 kfree_skb(skb);
253 }
254 }
255}
256
257static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
258 bool local)
259{
260 struct ipvl_dev *ipvlan = addr->master;
261 struct net_device *dev = ipvlan->dev;
262 unsigned int len;
263 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
264 bool success = false;
265
266 len = skb->len + ETH_HLEN;
267 if (unlikely(!(dev->flags & IFF_UP))) {
268 kfree_skb(skb);
269 goto out;
270 }
271
272 skb = skb_share_check(skb, GFP_ATOMIC);
273 if (!skb)
274 goto out;
275
276 skb->dev = dev;
277 skb->pkt_type = PACKET_HOST;
278
279 if (local) {
280 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
281 success = true;
282 } else {
283 ret = RX_HANDLER_ANOTHER;
284 success = true;
285 }
286
287out:
288 ipvlan_count_rx(ipvlan, len, success, false);
289 return ret;
290}
291
292static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
293 void *lyr3h, int addr_type,
294 bool use_dest)
295{
296 struct ipvl_addr *addr = NULL;
297
298 if (addr_type == IPVL_IPV6) {
299 struct ipv6hdr *ip6h;
300 struct in6_addr *i6addr;
301
302 ip6h = (struct ipv6hdr *)lyr3h;
303 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
304 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
305 } else if (addr_type == IPVL_ICMPV6) {
306 struct nd_msg *ndmh;
307 struct in6_addr *i6addr;
308
309
310
311
312 ndmh = (struct nd_msg *)lyr3h;
313 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
314 i6addr = &ndmh->target;
315 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
316 }
317 } else if (addr_type == IPVL_IPV4) {
318 struct iphdr *ip4h;
319 __be32 *i4addr;
320
321 ip4h = (struct iphdr *)lyr3h;
322 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
323 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
324 } else if (addr_type == IPVL_ARP) {
325 struct arphdr *arph;
326 unsigned char *arp_ptr;
327 __be32 dip;
328
329 arph = (struct arphdr *)lyr3h;
330 arp_ptr = (unsigned char *)(arph + 1);
331 if (use_dest)
332 arp_ptr += (2 * port->dev->addr_len) + 4;
333 else
334 arp_ptr += port->dev->addr_len;
335
336 memcpy(&dip, arp_ptr, 4);
337 addr = ipvlan_ht_addr_lookup(port, &dip, false);
338 }
339
340 return addr;
341}
342
343static int ipvlan_process_v4_outbound(struct sk_buff *skb)
344{
345 const struct iphdr *ip4h = ip_hdr(skb);
346 struct net_device *dev = skb->dev;
347 struct rtable *rt;
348 int err, ret = NET_XMIT_DROP;
349 struct flowi4 fl4 = {
350 .flowi4_oif = dev_get_iflink(dev),
351 .flowi4_tos = RT_TOS(ip4h->tos),
352 .flowi4_flags = FLOWI_FLAG_ANYSRC,
353 .daddr = ip4h->daddr,
354 .saddr = ip4h->saddr,
355 };
356
357 rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
358 if (IS_ERR(rt))
359 goto err;
360
361 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
362 ip_rt_put(rt);
363 goto err;
364 }
365 skb_dst_drop(skb);
366 skb_dst_set(skb, &rt->dst);
367 err = ip_local_out(skb);
368 if (unlikely(net_xmit_eval(err)))
369 dev->stats.tx_errors++;
370 else
371 ret = NET_XMIT_SUCCESS;
372 goto out;
373err:
374 dev->stats.tx_errors++;
375 kfree_skb(skb);
376out:
377 return ret;
378}
379
380static int ipvlan_process_v6_outbound(struct sk_buff *skb)
381{
382 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
383 struct net_device *dev = skb->dev;
384 struct dst_entry *dst;
385 int err, ret = NET_XMIT_DROP;
386 struct flowi6 fl6 = {
387 .flowi6_iif = skb->dev->ifindex,
388 .daddr = ip6h->daddr,
389 .saddr = ip6h->saddr,
390 .flowi6_flags = FLOWI_FLAG_ANYSRC,
391 .flowlabel = ip6_flowinfo(ip6h),
392 .flowi6_mark = skb->mark,
393 .flowi6_proto = ip6h->nexthdr,
394 };
395
396 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
397 if (dst->error) {
398 ret = dst->error;
399 dst_release(dst);
400 goto err;
401 }
402 skb_dst_drop(skb);
403 skb_dst_set(skb, dst);
404 err = ip6_local_out(skb);
405 if (unlikely(net_xmit_eval(err)))
406 dev->stats.tx_errors++;
407 else
408 ret = NET_XMIT_SUCCESS;
409 goto out;
410err:
411 dev->stats.tx_errors++;
412 kfree_skb(skb);
413out:
414 return ret;
415}
416
417static int ipvlan_process_outbound(struct sk_buff *skb,
418 const struct ipvl_dev *ipvlan)
419{
420 struct ethhdr *ethh = eth_hdr(skb);
421 int ret = NET_XMIT_DROP;
422
423
424 if (is_multicast_ether_addr(ethh->h_dest)) {
425 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
426 ntohs(skb->protocol));
427 kfree_skb(skb);
428 goto out;
429 }
430
431
432
433
434
435 if (skb_mac_header_was_set(skb)) {
436 skb_pull(skb, sizeof(*ethh));
437 skb->mac_header = (typeof(skb->mac_header))~0U;
438 skb_reset_network_header(skb);
439 }
440
441 if (skb->protocol == htons(ETH_P_IPV6))
442 ret = ipvlan_process_v6_outbound(skb);
443 else if (skb->protocol == htons(ETH_P_IP))
444 ret = ipvlan_process_v4_outbound(skb);
445 else {
446 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
447 ntohs(skb->protocol));
448 kfree_skb(skb);
449 }
450out:
451 return ret;
452}
453
454static void ipvlan_multicast_enqueue(struct ipvl_port *port,
455 struct sk_buff *skb)
456{
457 if (skb->protocol == htons(ETH_P_PAUSE)) {
458 kfree_skb(skb);
459 return;
460 }
461
462 spin_lock(&port->backlog.lock);
463 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
464 __skb_queue_tail(&port->backlog, skb);
465 spin_unlock(&port->backlog.lock);
466 schedule_work(&port->wq);
467 } else {
468 spin_unlock(&port->backlog.lock);
469 atomic_long_inc(&skb->dev->rx_dropped);
470 kfree_skb(skb);
471 }
472}
473
474static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
475{
476 const struct ipvl_dev *ipvlan = netdev_priv(dev);
477 void *lyr3h;
478 struct ipvl_addr *addr;
479 int addr_type;
480
481 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
482 if (!lyr3h)
483 goto out;
484
485 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
486 if (addr)
487 return ipvlan_rcv_frame(addr, skb, true);
488
489out:
490 skb->dev = ipvlan->phy_dev;
491 return ipvlan_process_outbound(skb, ipvlan);
492}
493
494static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
495{
496 const struct ipvl_dev *ipvlan = netdev_priv(dev);
497 struct ethhdr *eth = eth_hdr(skb);
498 struct ipvl_addr *addr;
499 void *lyr3h;
500 int addr_type;
501
502 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
503 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
504 if (lyr3h) {
505 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
506 if (addr)
507 return ipvlan_rcv_frame(addr, skb, true);
508 }
509 skb = skb_share_check(skb, GFP_ATOMIC);
510 if (!skb)
511 return NET_XMIT_DROP;
512
513
514
515
516
517
518 return dev_forward_skb(ipvlan->phy_dev, skb);
519
520 } else if (is_multicast_ether_addr(eth->h_dest)) {
521 ipvlan_multicast_enqueue(ipvlan->port, skb);
522 return NET_XMIT_SUCCESS;
523 }
524
525 skb->dev = ipvlan->phy_dev;
526 return dev_queue_xmit(skb);
527}
528
529int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
530{
531 struct ipvl_dev *ipvlan = netdev_priv(dev);
532 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
533
534 if (!port)
535 goto out;
536
537 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
538 goto out;
539
540 switch(port->mode) {
541 case IPVLAN_MODE_L2:
542 return ipvlan_xmit_mode_l2(skb, dev);
543 case IPVLAN_MODE_L3:
544 return ipvlan_xmit_mode_l3(skb, dev);
545 }
546
547
548 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
549 port->mode);
550out:
551 kfree_skb(skb);
552 return NET_XMIT_DROP;
553}
554
555static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
556{
557 struct ethhdr *eth = eth_hdr(skb);
558 struct ipvl_addr *addr;
559 void *lyr3h;
560 int addr_type;
561
562 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
563 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
564 if (!lyr3h)
565 return true;
566
567 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
568 if (addr)
569 return false;
570 }
571
572 return true;
573}
574
575static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
576 struct ipvl_port *port)
577{
578 void *lyr3h;
579 int addr_type;
580 struct ipvl_addr *addr;
581 struct sk_buff *skb = *pskb;
582 rx_handler_result_t ret = RX_HANDLER_PASS;
583
584 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
585 if (!lyr3h)
586 goto out;
587
588 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
589 if (addr)
590 ret = ipvlan_rcv_frame(addr, skb, false);
591
592out:
593 return ret;
594}
595
596static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
597 struct ipvl_port *port)
598{
599 struct sk_buff *skb = *pskb;
600 struct ethhdr *eth = eth_hdr(skb);
601 rx_handler_result_t ret = RX_HANDLER_PASS;
602 void *lyr3h;
603 int addr_type;
604
605 if (is_multicast_ether_addr(eth->h_dest)) {
606 if (ipvlan_external_frame(skb, port)) {
607 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
608
609
610
611
612
613
614
615 if (nskb)
616 ipvlan_multicast_enqueue(port, nskb);
617 }
618 } else {
619 struct ipvl_addr *addr;
620
621 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
622 if (!lyr3h)
623 return ret;
624
625 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
626 if (addr)
627 ret = ipvlan_rcv_frame(addr, skb, false);
628 }
629
630 return ret;
631}
632
633rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
634{
635 struct sk_buff *skb = *pskb;
636 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
637
638 if (!port)
639 return RX_HANDLER_PASS;
640
641 switch (port->mode) {
642 case IPVLAN_MODE_L2:
643 return ipvlan_handle_mode_l2(pskb, port);
644 case IPVLAN_MODE_L3:
645 return ipvlan_handle_mode_l3(pskb, port);
646 }
647
648
649 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
650 port->mode);
651 kfree_skb(skb);
652 return NET_RX_DROP;
653}
654
