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;
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 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
87 void ipvlan_ht_addr_del(struct ipvl_addr *addr, bool sync)
89 hlist_del_rcu(&addr->hlnode);
94 bool ipvlan_addr_busy(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
96 struct ipvl_port *port = ipvlan->port;
97 struct ipvl_addr *addr;
99 list_for_each_entry(addr, &ipvlan->addrs, anode) {
100 if ((is_v6 && addr->atype == IPVL_IPV6 &&
101 ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
102 (!is_v6 && addr->atype == IPVL_IPV4 &&
103 addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
107 if (ipvlan_ht_addr_lookup(port, iaddr, is_v6))
113 static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type)
117 switch (skb->protocol) {
118 case htons(ETH_P_ARP): {
121 if (unlikely(!pskb_may_pull(skb, sizeof(*arph))))
129 case htons(ETH_P_IP): {
133 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
137 pktlen = ntohs(ip4h->tot_len);
138 if (ip4h->ihl < 5 || ip4h->version != 4)
140 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
147 case htons(ETH_P_IPV6): {
148 struct ipv6hdr *ip6h;
150 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
153 ip6h = ipv6_hdr(skb);
154 if (ip6h->version != 6)
159 /* Only Neighbour Solicitation pkts need different treatment */
160 if (ipv6_addr_any(&ip6h->saddr) &&
161 ip6h->nexthdr == NEXTHDR_ICMP) {
174 unsigned int ipvlan_mac_hash(const unsigned char *addr)
176 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
177 ipvlan_jhash_secret);
179 return hash & IPVLAN_MAC_FILTER_MASK;
182 static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb,
183 const struct ipvl_dev *in_dev, bool local)
185 struct ethhdr *eth = eth_hdr(skb);
186 struct ipvl_dev *ipvlan;
187 struct sk_buff *nskb;
189 unsigned int mac_hash;
192 if (skb->protocol == htons(ETH_P_PAUSE))
195 list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
196 if (local && (ipvlan == in_dev))
199 mac_hash = ipvlan_mac_hash(eth->h_dest);
200 if (!test_bit(mac_hash, ipvlan->mac_filters))
204 len = skb->len + ETH_HLEN;
205 nskb = skb_clone(skb, GFP_ATOMIC);
209 if (ether_addr_equal(eth->h_dest, ipvlan->phy_dev->broadcast))
210 nskb->pkt_type = PACKET_BROADCAST;
212 nskb->pkt_type = PACKET_MULTICAST;
214 nskb->dev = ipvlan->dev;
216 ret = dev_forward_skb(ipvlan->dev, nskb);
218 ret = netif_rx(nskb);
220 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
223 /* Locally generated? ...Forward a copy to the main-device as
224 * well. On the RX side we'll ignore it (wont give it to any
225 * of the virtual devices.
228 nskb = skb_clone(skb, GFP_ATOMIC);
230 if (ether_addr_equal(eth->h_dest, port->dev->broadcast))
231 nskb->pkt_type = PACKET_BROADCAST;
233 nskb->pkt_type = PACKET_MULTICAST;
235 dev_forward_skb(port->dev, nskb);
240 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
243 struct ipvl_dev *ipvlan = addr->master;
244 struct net_device *dev = ipvlan->dev;
246 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
247 bool success = false;
249 len = skb->len + ETH_HLEN;
250 if (unlikely(!(dev->flags & IFF_UP))) {
255 skb = skb_share_check(skb, GFP_ATOMIC);
260 skb->pkt_type = PACKET_HOST;
263 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
266 ret = RX_HANDLER_ANOTHER;
271 ipvlan_count_rx(ipvlan, len, success, false);
275 static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
276 void *lyr3h, int addr_type,
279 struct ipvl_addr *addr = NULL;
281 if (addr_type == IPVL_IPV6) {
282 struct ipv6hdr *ip6h;
283 struct in6_addr *i6addr;
285 ip6h = (struct ipv6hdr *)lyr3h;
286 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
287 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
288 } else if (addr_type == IPVL_ICMPV6) {
290 struct in6_addr *i6addr;
292 /* Make sure that the NeighborSolicitation ICMPv6 packets
293 * are handled to avoid DAD issue.
295 ndmh = (struct nd_msg *)lyr3h;
296 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
297 i6addr = &ndmh->target;
298 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
300 } else if (addr_type == IPVL_IPV4) {
304 ip4h = (struct iphdr *)lyr3h;
305 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
306 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
307 } else if (addr_type == IPVL_ARP) {
309 unsigned char *arp_ptr;
312 arph = (struct arphdr *)lyr3h;
313 arp_ptr = (unsigned char *)(arph + 1);
315 arp_ptr += (2 * port->dev->addr_len) + 4;
317 arp_ptr += port->dev->addr_len;
319 memcpy(&dip, arp_ptr, 4);
320 addr = ipvlan_ht_addr_lookup(port, &dip, false);
326 static int ipvlan_process_v4_outbound(struct sk_buff *skb)
328 const struct iphdr *ip4h = ip_hdr(skb);
329 struct net_device *dev = skb->dev;
331 int err, ret = NET_XMIT_DROP;
332 struct flowi4 fl4 = {
333 .flowi4_oif = dev->iflink,
334 .flowi4_tos = RT_TOS(ip4h->tos),
335 .flowi4_flags = FLOWI_FLAG_ANYSRC,
336 .daddr = ip4h->daddr,
337 .saddr = ip4h->saddr,
340 rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
344 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
349 skb_dst_set(skb, &rt->dst);
350 err = ip_local_out(skb);
351 if (unlikely(net_xmit_eval(err)))
352 dev->stats.tx_errors++;
354 ret = NET_XMIT_SUCCESS;
357 dev->stats.tx_errors++;
363 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
365 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
366 struct net_device *dev = skb->dev;
367 struct dst_entry *dst;
368 int err, ret = NET_XMIT_DROP;
369 struct flowi6 fl6 = {
370 .flowi6_iif = skb->dev->ifindex,
371 .daddr = ip6h->daddr,
372 .saddr = ip6h->saddr,
373 .flowi6_flags = FLOWI_FLAG_ANYSRC,
374 .flowlabel = ip6_flowinfo(ip6h),
375 .flowi6_mark = skb->mark,
376 .flowi6_proto = ip6h->nexthdr,
379 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
386 skb_dst_set(skb, dst);
387 err = ip6_local_out(skb);
388 if (unlikely(net_xmit_eval(err)))
389 dev->stats.tx_errors++;
391 ret = NET_XMIT_SUCCESS;
394 dev->stats.tx_errors++;
400 static int ipvlan_process_outbound(struct sk_buff *skb,
401 const struct ipvl_dev *ipvlan)
403 struct ethhdr *ethh = eth_hdr(skb);
404 int ret = NET_XMIT_DROP;
406 /* In this mode we dont care about multicast and broadcast traffic */
407 if (is_multicast_ether_addr(ethh->h_dest)) {
408 pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
409 ntohs(skb->protocol));
414 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
415 * will have L2; which need to discarded and processed further
416 * in the net-ns of the main-device.
418 if (skb_mac_header_was_set(skb)) {
419 skb_pull(skb, sizeof(*ethh));
420 skb->mac_header = (typeof(skb->mac_header))~0U;
421 skb_reset_network_header(skb);
424 if (skb->protocol == htons(ETH_P_IPV6))
425 ret = ipvlan_process_v6_outbound(skb);
426 else if (skb->protocol == htons(ETH_P_IP))
427 ret = ipvlan_process_v4_outbound(skb);
429 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
430 ntohs(skb->protocol));
437 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
439 const struct ipvl_dev *ipvlan = netdev_priv(dev);
441 struct ipvl_addr *addr;
444 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
448 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
450 return ipvlan_rcv_frame(addr, skb, true);
453 skb->dev = ipvlan->phy_dev;
454 return ipvlan_process_outbound(skb, ipvlan);
457 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
459 const struct ipvl_dev *ipvlan = netdev_priv(dev);
460 struct ethhdr *eth = eth_hdr(skb);
461 struct ipvl_addr *addr;
465 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
466 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
468 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
470 return ipvlan_rcv_frame(addr, skb, true);
472 skb = skb_share_check(skb, GFP_ATOMIC);
474 return NET_XMIT_DROP;
476 /* Packet definitely does not belong to any of the
477 * virtual devices, but the dest is local. So forward
478 * the skb for the main-dev. At the RX side we just return
479 * RX_PASS for it to be processed further on the stack.
481 return dev_forward_skb(ipvlan->phy_dev, skb);
483 } else if (is_multicast_ether_addr(eth->h_dest)) {
484 u8 ip_summed = skb->ip_summed;
486 skb->ip_summed = CHECKSUM_UNNECESSARY;
487 ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true);
488 skb->ip_summed = ip_summed;
491 skb->dev = ipvlan->phy_dev;
492 return dev_queue_xmit(skb);
495 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
497 struct ipvl_dev *ipvlan = netdev_priv(dev);
498 struct ipvl_port *port = ipvlan_port_get_rcu(ipvlan->phy_dev);
503 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
508 return ipvlan_xmit_mode_l2(skb, dev);
510 return ipvlan_xmit_mode_l3(skb, dev);
513 /* Should not reach here */
514 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
518 return NET_XMIT_DROP;
521 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
523 struct ethhdr *eth = eth_hdr(skb);
524 struct ipvl_addr *addr;
528 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
529 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
533 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
541 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
542 struct ipvl_port *port)
546 struct ipvl_addr *addr;
547 struct sk_buff *skb = *pskb;
548 rx_handler_result_t ret = RX_HANDLER_PASS;
550 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
554 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
556 ret = ipvlan_rcv_frame(addr, skb, false);
562 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
563 struct ipvl_port *port)
565 struct sk_buff *skb = *pskb;
566 struct ethhdr *eth = eth_hdr(skb);
567 rx_handler_result_t ret = RX_HANDLER_PASS;
571 if (is_multicast_ether_addr(eth->h_dest)) {
572 if (ipvlan_external_frame(skb, port))
573 ipvlan_multicast_frame(port, skb, NULL, false);
575 struct ipvl_addr *addr;
577 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
581 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
583 ret = ipvlan_rcv_frame(addr, skb, false);
589 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
591 struct sk_buff *skb = *pskb;
592 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
595 return RX_HANDLER_PASS;
597 switch (port->mode) {
599 return ipvlan_handle_mode_l2(pskb, port);
601 return ipvlan_handle_mode_l3(pskb, port);
604 /* Should not reach here */
605 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",