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, bool sync)
90 hlist_del_init_rcu(&addr->hlnode);
95 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
96 const void *iaddr, bool is_v6)
98 struct ipvl_addr *addr;
100 list_for_each_entry(addr, &ipvlan->addrs, anode) {
101 if ((is_v6 && addr->atype == IPVL_IPV6 &&
102 ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
103 (!is_v6 && addr->atype == IPVL_IPV4 &&
104 addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
110 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
112 struct ipvl_dev *ipvlan;
116 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
117 if (ipvlan_find_addr(ipvlan, iaddr, is_v6))
123 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
127 switch (skb->protocol) {
128 case htons(ETH_P_ARP): {
131 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
139 case htons(ETH_P_IP): {
143 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
147 pktlen = ntohs(ip4h->tot_len);
148 if (ip4h->ihl < 5 || ip4h->version != 4)
150 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
157 case htons(ETH_P_IPV6): {
158 struct ipv6hdr *ip6h;
160 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
163 ip6h = ipv6_hdr(skb);
164 if (ip6h->version != 6)
169 /* Only Neighbour Solicitation pkts need different treatment */
170 if (ipv6_addr_any(&ip6h->saddr) &&
171 ip6h->nexthdr == NEXTHDR_ICMP) {
184 unsigned int ipvlan_mac_hash(const unsigned char *addr)
186 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
187 ipvlan_jhash_secret);
189 return hash & IPVLAN_MAC_FILTER_MASK;
192 static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb,
193 const struct ipvl_dev *in_dev, bool local)
195 struct ethhdr *eth = eth_hdr(skb);
196 struct ipvl_dev *ipvlan;
197 struct sk_buff *nskb;
199 unsigned int mac_hash;
202 if (skb->protocol == htons(ETH_P_PAUSE))
206 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
207 if (local && (ipvlan == in_dev))
210 mac_hash = ipvlan_mac_hash(eth->h_dest);
211 if (!test_bit(mac_hash, ipvlan->mac_filters))
215 len = skb->len + ETH_HLEN;
216 nskb = skb_clone(skb, GFP_ATOMIC);
220 if (ether_addr_equal(eth->h_dest, ipvlan->phy_dev->broadcast))
221 nskb->pkt_type = PACKET_BROADCAST;
223 nskb->pkt_type = PACKET_MULTICAST;
225 nskb->dev = ipvlan->dev;
227 ret = dev_forward_skb(ipvlan->dev, nskb);
229 ret = netif_rx(nskb);
231 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
235 /* Locally generated? ...Forward a copy to the main-device as
236 * well. On the RX side we'll ignore it (wont give it to any
237 * of the virtual devices.
240 nskb = skb_clone(skb, GFP_ATOMIC);
242 if (ether_addr_equal(eth->h_dest, port->dev->broadcast))
243 nskb->pkt_type = PACKET_BROADCAST;
245 nskb->pkt_type = PACKET_MULTICAST;
247 dev_forward_skb(port->dev, nskb);
252 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
255 struct ipvl_dev *ipvlan = addr->master;
256 struct net_device *dev = ipvlan->dev;
258 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
259 bool success = false;
261 len = skb->len + ETH_HLEN;
262 if (unlikely(!(dev->flags & IFF_UP))) {
267 skb = skb_share_check(skb, GFP_ATOMIC);
272 skb->pkt_type = PACKET_HOST;
275 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
278 ret = RX_HANDLER_ANOTHER;
283 ipvlan_count_rx(ipvlan, len, success, false);
287 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
288 void *lyr3h, int addr_type,
291 struct ipvl_addr *addr = NULL;
293 if (addr_type == IPVL_IPV6) {
294 struct ipv6hdr *ip6h;
295 struct in6_addr *i6addr;
297 ip6h = (struct ipv6hdr *)lyr3h;
298 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
299 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
300 } else if (addr_type == IPVL_ICMPV6) {
302 struct in6_addr *i6addr;
304 /* Make sure that the NeighborSolicitation ICMPv6 packets
305 * are handled to avoid DAD issue.
307 ndmh = (struct nd_msg *)lyr3h;
308 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
309 i6addr = &ndmh->target;
310 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
312 } else if (addr_type == IPVL_IPV4) {
316 ip4h = (struct iphdr *)lyr3h;
317 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
318 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
319 } else if (addr_type == IPVL_ARP) {
321 unsigned char *arp_ptr;
324 arph = (struct arphdr *)lyr3h;
325 arp_ptr = (unsigned char *)(arph + 1);
327 arp_ptr += (2 * port->dev->addr_len) + 4;
329 arp_ptr += port->dev->addr_len;
331 memcpy(&dip, arp_ptr, 4);
332 addr = ipvlan_ht_addr_lookup(port, &dip, false);
338 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
340 const struct iphdr *ip4h = ip_hdr(skb);
341 struct net_device *dev = skb->dev;
343 int err, ret = NET_XMIT_DROP;
344 struct flowi4 fl4 = {
345 .flowi4_oif = dev->iflink,
346 .flowi4_tos = RT_TOS(ip4h->tos),
347 .flowi4_flags = FLOWI_FLAG_ANYSRC,
348 .daddr = ip4h->daddr,
349 .saddr = ip4h->saddr,
352 rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
356 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
361 skb_dst_set(skb, &rt->dst);
362 err = ip_local_out(skb);
363 if (unlikely(net_xmit_eval(err)))
364 dev->stats.tx_errors++;
366 ret = NET_XMIT_SUCCESS;
369 dev->stats.tx_errors++;
375 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
377 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
378 struct net_device *dev = skb->dev;
379 struct dst_entry *dst;
380 int err, ret = NET_XMIT_DROP;
381 struct flowi6 fl6 = {
382 .flowi6_iif = skb->dev->ifindex,
383 .daddr = ip6h->daddr,
384 .saddr = ip6h->saddr,
385 .flowi6_flags = FLOWI_FLAG_ANYSRC,
386 .flowlabel = ip6_flowinfo(ip6h),
387 .flowi6_mark = skb->mark,
388 .flowi6_proto = ip6h->nexthdr,
391 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
398 skb_dst_set(skb, dst);
399 err = ip6_local_out(skb);
400 if (unlikely(net_xmit_eval(err)))
401 dev->stats.tx_errors++;
403 ret = NET_XMIT_SUCCESS;
406 dev->stats.tx_errors++;
412 static int ipvlan_process_outbound(struct sk_buff *skb,
413 const struct ipvl_dev *ipvlan)
415 struct ethhdr *ethh = eth_hdr(skb);
416 int ret = NET_XMIT_DROP;
418 /* In this mode we dont care about multicast and broadcast traffic */
419 if (is_multicast_ether_addr(ethh->h_dest)) {
420 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
421 ntohs(skb->protocol));
426 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
427 * will have L2; which need to discarded and processed further
428 * in the net-ns of the main-device.
430 if (skb_mac_header_was_set(skb)) {
431 skb_pull(skb, sizeof(*ethh));
432 skb->mac_header = (typeof(skb->mac_header))~0U;
433 skb_reset_network_header(skb);
436 if (skb->protocol == htons(ETH_P_IPV6))
437 ret = ipvlan_process_v6_outbound(skb);
438 else if (skb->protocol == htons(ETH_P_IP))
439 ret = ipvlan_process_v4_outbound(skb);
441 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
442 ntohs(skb->protocol));
449 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
451 const struct ipvl_dev *ipvlan = netdev_priv(dev);
453 struct ipvl_addr *addr;
456 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
460 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
462 return ipvlan_rcv_frame(addr, skb, true);
465 skb->dev = ipvlan->phy_dev;
466 return ipvlan_process_outbound(skb, ipvlan);
469 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
471 const struct ipvl_dev *ipvlan = netdev_priv(dev);
472 struct ethhdr *eth = eth_hdr(skb);
473 struct ipvl_addr *addr;
477 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
478 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
480 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
482 return ipvlan_rcv_frame(addr, skb, true);
484 skb = skb_share_check(skb, GFP_ATOMIC);
486 return NET_XMIT_DROP;
488 /* Packet definitely does not belong to any of the
489 * virtual devices, but the dest is local. So forward
490 * the skb for the main-dev. At the RX side we just return
491 * RX_PASS for it to be processed further on the stack.
493 return dev_forward_skb(ipvlan->phy_dev, skb);
495 } else if (is_multicast_ether_addr(eth->h_dest)) {
496 u8 ip_summed = skb->ip_summed;
498 skb->ip_summed = CHECKSUM_UNNECESSARY;
499 ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true);
500 skb->ip_summed = ip_summed;
503 skb->dev = ipvlan->phy_dev;
504 return dev_queue_xmit(skb);
507 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
509 struct ipvl_dev *ipvlan = netdev_priv(dev);
510 struct ipvl_port *port = ipvlan_port_get_rcu(ipvlan->phy_dev);
515 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
520 return ipvlan_xmit_mode_l2(skb, dev);
522 return ipvlan_xmit_mode_l3(skb, dev);
525 /* Should not reach here */
526 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
530 return NET_XMIT_DROP;
533 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
535 struct ethhdr *eth = eth_hdr(skb);
536 struct ipvl_addr *addr;
540 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
541 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
545 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
553 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
554 struct ipvl_port *port)
558 struct ipvl_addr *addr;
559 struct sk_buff *skb = *pskb;
560 rx_handler_result_t ret = RX_HANDLER_PASS;
562 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
566 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
568 ret = ipvlan_rcv_frame(addr, skb, false);
574 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
575 struct ipvl_port *port)
577 struct sk_buff *skb = *pskb;
578 struct ethhdr *eth = eth_hdr(skb);
579 rx_handler_result_t ret = RX_HANDLER_PASS;
583 if (is_multicast_ether_addr(eth->h_dest)) {
584 if (ipvlan_external_frame(skb, port))
585 ipvlan_multicast_frame(port, skb, NULL, false);
587 struct ipvl_addr *addr;
589 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
593 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
595 ret = ipvlan_rcv_frame(addr, skb, false);
601 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
603 struct sk_buff *skb = *pskb;
604 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
607 return RX_HANDLER_PASS;
609 switch (port->mode) {
611 return ipvlan_handle_mode_l2(pskb, port);
613 return ipvlan_handle_mode_l3(pskb, port);
616 /* Should not reach here */
617 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",