1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
12 static u32 ipvlan_jhash_secret __read_mostly;
14 void ipvlan_init_secret(void)
16 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
19 static void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
20 unsigned int len, bool success, bool mcast)
25 if (likely(success)) {
26 struct ipvl_pcpu_stats *pcptr;
28 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
29 u64_stats_update_begin(&pcptr->syncp);
31 pcptr->rx_bytes += len;
34 u64_stats_update_end(&pcptr->syncp);
36 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
40 static u8 ipvlan_get_v6_hash(const void *iaddr)
42 const struct in6_addr *ip6_addr = iaddr;
44 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
48 static u8 ipvlan_get_v4_hash(const void *iaddr)
50 const struct in_addr *ip4_addr = iaddr;
52 return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
56 struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
57 const void *iaddr, bool is_v6)
59 struct ipvl_addr *addr;
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))
68 else if (!is_v6 && addr->atype == IPVL_IPV4 &&
69 addr->ip4addr.s_addr ==
70 ((struct in_addr *)iaddr)->s_addr)
76 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
78 struct ipvl_port *port = ipvlan->port;
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]);
88 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
90 hlist_del_init_rcu(&addr->hlnode);
93 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
94 const void *iaddr, bool is_v6)
96 struct ipvl_addr *addr;
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))
108 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
110 struct ipvl_dev *ipvlan;
114 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
115 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
121 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
125 switch (skb->protocol) {
126 case htons(ETH_P_ARP): {
129 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
137 case htons(ETH_P_IP): {
141 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
145 pktlen = ntohs(ip4h->tot_len);
146 if (ip4h->ihl < 5 || ip4h->version != 4)
148 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
155 case htons(ETH_P_IPV6): {
156 struct ipv6hdr *ip6h;
158 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
161 ip6h = ipv6_hdr(skb);
162 if (ip6h->version != 6)
167 /* Only Neighbour Solicitation pkts need different treatment */
168 if (ipv6_addr_any(&ip6h->saddr) &&
169 ip6h->nexthdr == NEXTHDR_ICMP) {
182 unsigned int ipvlan_mac_hash(const unsigned char *addr)
184 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
185 ipvlan_jhash_secret);
187 return hash & IPVLAN_MAC_FILTER_MASK;
190 void ipvlan_process_multicast(struct work_struct *work)
192 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
194 struct ipvl_dev *ipvlan;
195 struct sk_buff *skb, *nskb;
196 struct sk_buff_head list;
198 unsigned int mac_hash;
203 __skb_queue_head_init(&list);
205 spin_lock_bh(&port->backlog.lock);
206 skb_queue_splice_tail_init(&port->backlog, &list);
207 spin_unlock_bh(&port->backlog.lock);
209 while ((skb = __skb_dequeue(&list)) != NULL) {
211 hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr);
212 mac_hash = ipvlan_mac_hash(ethh->h_dest);
214 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
215 pkt_type = PACKET_BROADCAST;
217 pkt_type = PACKET_MULTICAST;
221 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
222 if (hlocal && (ipvlan->dev == skb->dev)) {
226 if (!test_bit(mac_hash, ipvlan->mac_filters))
230 len = skb->len + ETH_HLEN;
231 nskb = skb_clone(skb, GFP_ATOMIC);
235 nskb->pkt_type = pkt_type;
236 nskb->dev = ipvlan->dev;
238 ret = dev_forward_skb(ipvlan->dev, nskb);
240 ret = netif_rx(nskb);
242 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
247 /* If the packet originated here, send it out. */
248 skb->dev = port->dev;
249 skb->pkt_type = pkt_type;
257 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
260 struct ipvl_dev *ipvlan = addr->master;
261 struct net_device *dev = ipvlan->dev;
263 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
264 bool success = false;
265 struct sk_buff *skb = *pskb;
267 len = skb->len + ETH_HLEN;
268 if (unlikely(!(dev->flags & IFF_UP))) {
273 skb = skb_share_check(skb, GFP_ATOMIC);
279 skb->pkt_type = PACKET_HOST;
282 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
285 ret = RX_HANDLER_ANOTHER;
290 ipvlan_count_rx(ipvlan, len, success, false);
294 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
295 void *lyr3h, int addr_type,
298 struct ipvl_addr *addr = NULL;
300 if (addr_type == IPVL_IPV6) {
301 struct ipv6hdr *ip6h;
302 struct in6_addr *i6addr;
304 ip6h = (struct ipv6hdr *)lyr3h;
305 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
306 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
307 } else if (addr_type == IPVL_ICMPV6) {
309 struct in6_addr *i6addr;
311 /* Make sure that the NeighborSolicitation ICMPv6 packets
312 * are handled to avoid DAD issue.
314 ndmh = (struct nd_msg *)lyr3h;
315 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
316 i6addr = &ndmh->target;
317 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
319 } else if (addr_type == IPVL_IPV4) {
323 ip4h = (struct iphdr *)lyr3h;
324 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
325 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
326 } else if (addr_type == IPVL_ARP) {
328 unsigned char *arp_ptr;
331 arph = (struct arphdr *)lyr3h;
332 arp_ptr = (unsigned char *)(arph + 1);
334 arp_ptr += (2 * port->dev->addr_len) + 4;
336 arp_ptr += port->dev->addr_len;
338 memcpy(&dip, arp_ptr, 4);
339 addr = ipvlan_ht_addr_lookup(port, &dip, false);
345 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
347 const struct iphdr *ip4h = ip_hdr(skb);
348 struct net_device *dev = skb->dev;
349 struct net *net = dev_net(dev);
351 int err, ret = NET_XMIT_DROP;
352 struct flowi4 fl4 = {
353 .flowi4_oif = dev->ifindex,
354 .flowi4_tos = RT_TOS(ip4h->tos),
355 .flowi4_flags = FLOWI_FLAG_ANYSRC,
356 .daddr = ip4h->daddr,
357 .saddr = ip4h->saddr,
360 rt = ip_route_output_flow(net, &fl4, NULL);
364 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
369 skb_dst_set(skb, &rt->dst);
370 err = ip_local_out(net, skb->sk, skb);
371 if (unlikely(net_xmit_eval(err)))
372 dev->stats.tx_errors++;
374 ret = NET_XMIT_SUCCESS;
377 dev->stats.tx_errors++;
383 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
385 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
386 struct net_device *dev = skb->dev;
387 struct net *net = dev_net(dev);
388 struct dst_entry *dst;
389 int err, ret = NET_XMIT_DROP;
390 struct flowi6 fl6 = {
391 .flowi6_iif = dev->ifindex,
392 .daddr = ip6h->daddr,
393 .saddr = ip6h->saddr,
394 .flowi6_flags = FLOWI_FLAG_ANYSRC,
395 .flowlabel = ip6_flowinfo(ip6h),
396 .flowi6_mark = skb->mark,
397 .flowi6_proto = ip6h->nexthdr,
400 dst = ip6_route_output(net, NULL, &fl6);
407 skb_dst_set(skb, dst);
408 err = ip6_local_out(net, skb->sk, skb);
409 if (unlikely(net_xmit_eval(err)))
410 dev->stats.tx_errors++;
412 ret = NET_XMIT_SUCCESS;
415 dev->stats.tx_errors++;
421 static int ipvlan_process_outbound(struct sk_buff *skb,
422 const struct ipvl_dev *ipvlan)
424 struct ethhdr *ethh = eth_hdr(skb);
425 int ret = NET_XMIT_DROP;
427 /* In this mode we dont care about multicast and broadcast traffic */
428 if (is_multicast_ether_addr(ethh->h_dest)) {
429 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
430 ntohs(skb->protocol));
435 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
436 * will have L2; which need to discarded and processed further
437 * in the net-ns of the main-device.
439 if (skb_mac_header_was_set(skb)) {
440 skb_pull(skb, sizeof(*ethh));
441 skb->mac_header = (typeof(skb->mac_header))~0U;
442 skb_reset_network_header(skb);
445 if (skb->protocol == htons(ETH_P_IPV6))
446 ret = ipvlan_process_v6_outbound(skb);
447 else if (skb->protocol == htons(ETH_P_IP))
448 ret = ipvlan_process_v4_outbound(skb);
450 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
451 ntohs(skb->protocol));
458 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
461 if (skb->protocol == htons(ETH_P_PAUSE)) {
466 spin_lock(&port->backlog.lock);
467 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
468 __skb_queue_tail(&port->backlog, skb);
469 spin_unlock(&port->backlog.lock);
470 schedule_work(&port->wq);
472 spin_unlock(&port->backlog.lock);
473 atomic_long_inc(&skb->dev->rx_dropped);
478 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
480 const struct ipvl_dev *ipvlan = netdev_priv(dev);
482 struct ipvl_addr *addr;
485 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
489 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
491 return ipvlan_rcv_frame(addr, &skb, true);
494 skb->dev = ipvlan->phy_dev;
495 return ipvlan_process_outbound(skb, ipvlan);
498 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
500 const struct ipvl_dev *ipvlan = netdev_priv(dev);
501 struct ethhdr *eth = eth_hdr(skb);
502 struct ipvl_addr *addr;
506 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
507 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
509 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
511 return ipvlan_rcv_frame(addr, &skb, true);
513 skb = skb_share_check(skb, GFP_ATOMIC);
515 return NET_XMIT_DROP;
517 /* Packet definitely does not belong to any of the
518 * virtual devices, but the dest is local. So forward
519 * the skb for the main-dev. At the RX side we just return
520 * RX_PASS for it to be processed further on the stack.
522 return dev_forward_skb(ipvlan->phy_dev, skb);
524 } else if (is_multicast_ether_addr(eth->h_dest)) {
525 ipvlan_multicast_enqueue(ipvlan->port, skb);
526 return NET_XMIT_SUCCESS;
529 skb->dev = ipvlan->phy_dev;
530 return dev_queue_xmit(skb);
533 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
535 struct ipvl_dev *ipvlan = netdev_priv(dev);
536 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
541 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
546 return ipvlan_xmit_mode_l2(skb, dev);
548 return ipvlan_xmit_mode_l3(skb, dev);
551 /* Should not reach here */
552 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
556 return NET_XMIT_DROP;
559 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
561 struct ethhdr *eth = eth_hdr(skb);
562 struct ipvl_addr *addr;
566 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
567 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
571 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
579 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
580 struct ipvl_port *port)
584 struct ipvl_addr *addr;
585 struct sk_buff *skb = *pskb;
586 rx_handler_result_t ret = RX_HANDLER_PASS;
588 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
592 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
594 ret = ipvlan_rcv_frame(addr, pskb, false);
600 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
601 struct ipvl_port *port)
603 struct sk_buff *skb = *pskb;
604 struct ethhdr *eth = eth_hdr(skb);
605 rx_handler_result_t ret = RX_HANDLER_PASS;
609 if (is_multicast_ether_addr(eth->h_dest)) {
610 if (ipvlan_external_frame(skb, port)) {
611 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
613 /* External frames are queued for device local
614 * distribution, but a copy is given to master
615 * straight away to avoid sending duplicates later
616 * when work-queue processes this frame. This is
617 * achieved by returning RX_HANDLER_PASS.
620 ipvlan_multicast_enqueue(port, nskb);
623 struct ipvl_addr *addr;
625 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
629 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
631 ret = ipvlan_rcv_frame(addr, pskb, false);
637 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
639 struct sk_buff *skb = *pskb;
640 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
643 return RX_HANDLER_PASS;
645 switch (port->mode) {
647 return ipvlan_handle_mode_l2(pskb, port);
649 return ipvlan_handle_mode_l3(pskb, port);
652 /* Should not reach here */
653 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
656 return RX_HANDLER_CONSUMED;