1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
7 static u32 ipvlan_jhash_secret __read_mostly;
9 void ipvlan_init_secret(void)
11 net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
14 void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
15 unsigned int len, bool success, bool mcast)
17 if (likely(success)) {
18 struct ipvl_pcpu_stats *pcptr;
20 pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
21 u64_stats_update_begin(&pcptr->syncp);
23 pcptr->rx_bytes += len;
26 u64_stats_update_end(&pcptr->syncp);
28 this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
31 EXPORT_SYMBOL_GPL(ipvlan_count_rx);
33 #if IS_ENABLED(CONFIG_IPV6)
34 static u8 ipvlan_get_v6_hash(const void *iaddr)
36 const struct in6_addr *ip6_addr = iaddr;
38 return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
42 static u8 ipvlan_get_v6_hash(const void *iaddr)
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 static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
58 if (!is_v6 && addr->atype == IPVL_IPV4) {
59 struct in_addr *i4addr = (struct in_addr *)iaddr;
61 return addr->ip4addr.s_addr == i4addr->s_addr;
62 #if IS_ENABLED(CONFIG_IPV6)
63 } else if (is_v6 && addr->atype == IPVL_IPV6) {
64 struct in6_addr *i6addr = (struct in6_addr *)iaddr;
66 return ipv6_addr_equal(&addr->ip6addr, i6addr);
73 static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
74 const void *iaddr, bool is_v6)
76 struct ipvl_addr *addr;
79 hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
80 ipvlan_get_v4_hash(iaddr);
81 hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
82 if (addr_equal(is_v6, addr, iaddr))
87 void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
89 struct ipvl_port *port = ipvlan->port;
92 hash = (addr->atype == IPVL_IPV6) ?
93 ipvlan_get_v6_hash(&addr->ip6addr) :
94 ipvlan_get_v4_hash(&addr->ip4addr);
95 if (hlist_unhashed(&addr->hlnode))
96 hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
99 void ipvlan_ht_addr_del(struct ipvl_addr *addr)
101 hlist_del_init_rcu(&addr->hlnode);
104 struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
105 const void *iaddr, bool is_v6)
107 struct ipvl_addr *addr, *ret = NULL;
110 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
111 if (addr_equal(is_v6, addr, iaddr)) {
120 bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
122 struct ipvl_dev *ipvlan;
126 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
127 if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
136 void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
140 switch (skb->protocol) {
141 case htons(ETH_P_ARP): {
144 if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
152 case htons(ETH_P_IP): {
156 if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
160 pktlen = ntohs(ip4h->tot_len);
161 if (ip4h->ihl < 5 || ip4h->version != 4)
163 if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
170 #if IS_ENABLED(CONFIG_IPV6)
171 case htons(ETH_P_IPV6): {
172 struct ipv6hdr *ip6h;
174 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
177 ip6h = ipv6_hdr(skb);
178 if (ip6h->version != 6)
183 /* Only Neighbour Solicitation pkts need different treatment */
184 if (ipv6_addr_any(&ip6h->saddr) &&
185 ip6h->nexthdr == NEXTHDR_ICMP) {
186 struct icmp6hdr *icmph;
188 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
191 ip6h = ipv6_hdr(skb);
192 icmph = (struct icmp6hdr *)(ip6h + 1);
194 if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
195 /* Need to access the ipv6 address in body */
196 if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
197 + sizeof(struct in6_addr))))
200 ip6h = ipv6_hdr(skb);
201 icmph = (struct icmp6hdr *)(ip6h + 1);
217 unsigned int ipvlan_mac_hash(const unsigned char *addr)
219 u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
220 ipvlan_jhash_secret);
222 return hash & IPVLAN_MAC_FILTER_MASK;
225 void ipvlan_process_multicast(struct work_struct *work)
227 struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
229 struct ipvl_dev *ipvlan;
230 struct sk_buff *skb, *nskb;
231 struct sk_buff_head list;
233 unsigned int mac_hash;
238 __skb_queue_head_init(&list);
240 spin_lock_bh(&port->backlog.lock);
241 skb_queue_splice_tail_init(&port->backlog, &list);
242 spin_unlock_bh(&port->backlog.lock);
244 while ((skb = __skb_dequeue(&list)) != NULL) {
245 struct net_device *dev = skb->dev;
246 bool consumed = false;
249 tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
250 mac_hash = ipvlan_mac_hash(ethh->h_dest);
252 if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
253 pkt_type = PACKET_BROADCAST;
255 pkt_type = PACKET_MULTICAST;
258 list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
259 if (tx_pkt && (ipvlan->dev == skb->dev))
261 if (!test_bit(mac_hash, ipvlan->mac_filters))
263 if (!(ipvlan->dev->flags & IFF_UP))
266 len = skb->len + ETH_HLEN;
267 nskb = skb_clone(skb, GFP_ATOMIC);
271 nskb->pkt_type = pkt_type;
272 nskb->dev = ipvlan->dev;
274 ret = dev_forward_skb(ipvlan->dev, nskb);
276 ret = netif_rx(nskb);
278 ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
284 /* If the packet originated here, send it out. */
285 skb->dev = port->dev;
286 skb->pkt_type = pkt_type;
300 static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
305 xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
307 skb_scrub_packet(skb, xnet);
312 static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
315 struct ipvl_dev *ipvlan = addr->master;
316 struct net_device *dev = ipvlan->dev;
318 rx_handler_result_t ret = RX_HANDLER_CONSUMED;
319 bool success = false;
320 struct sk_buff *skb = *pskb;
322 len = skb->len + ETH_HLEN;
323 /* Only packets exchanged between two local slaves need to have
324 * device-up check as well as skb-share check.
327 if (unlikely(!(dev->flags & IFF_UP))) {
332 skb = skb_share_check(skb, GFP_ATOMIC);
340 skb->pkt_type = PACKET_HOST;
341 if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
345 ret = RX_HANDLER_ANOTHER;
350 ipvlan_count_rx(ipvlan, len, success, false);
354 struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
355 int addr_type, bool use_dest)
357 struct ipvl_addr *addr = NULL;
360 #if IS_ENABLED(CONFIG_IPV6)
362 struct ipv6hdr *ip6h;
363 struct in6_addr *i6addr;
365 ip6h = (struct ipv6hdr *)lyr3h;
366 i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
367 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
372 struct in6_addr *i6addr;
374 /* Make sure that the NeighborSolicitation ICMPv6 packets
375 * are handled to avoid DAD issue.
377 ndmh = (struct nd_msg *)lyr3h;
378 if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
379 i6addr = &ndmh->target;
380 addr = ipvlan_ht_addr_lookup(port, i6addr, true);
389 ip4h = (struct iphdr *)lyr3h;
390 i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
391 addr = ipvlan_ht_addr_lookup(port, i4addr, false);
396 unsigned char *arp_ptr;
399 arph = (struct arphdr *)lyr3h;
400 arp_ptr = (unsigned char *)(arph + 1);
402 arp_ptr += (2 * port->dev->addr_len) + 4;
404 arp_ptr += port->dev->addr_len;
406 memcpy(&dip, arp_ptr, 4);
407 addr = ipvlan_ht_addr_lookup(port, &dip, false);
415 static noinline_for_stack int ipvlan_process_v4_outbound(struct sk_buff *skb)
417 const struct iphdr *ip4h = ip_hdr(skb);
418 struct net_device *dev = skb->dev;
419 struct net *net = dev_net(dev);
421 int err, ret = NET_XMIT_DROP;
422 struct flowi4 fl4 = {
423 .flowi4_oif = dev->ifindex,
424 .flowi4_tos = RT_TOS(ip4h->tos),
425 .flowi4_flags = FLOWI_FLAG_ANYSRC,
426 .flowi4_mark = skb->mark,
427 .daddr = ip4h->daddr,
428 .saddr = ip4h->saddr,
431 rt = ip_route_output_flow(net, &fl4, NULL);
435 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
439 skb_dst_set(skb, &rt->dst);
441 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
443 err = ip_local_out(net, skb->sk, skb);
444 if (unlikely(net_xmit_eval(err)))
445 DEV_STATS_INC(dev, tx_errors);
447 ret = NET_XMIT_SUCCESS;
450 DEV_STATS_INC(dev, tx_errors);
456 #if IS_ENABLED(CONFIG_IPV6)
458 static noinline_for_stack int
459 ipvlan_route_v6_outbound(struct net_device *dev, struct sk_buff *skb)
461 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
462 struct flowi6 fl6 = {
463 .flowi6_oif = dev->ifindex,
464 .daddr = ip6h->daddr,
465 .saddr = ip6h->saddr,
466 .flowi6_flags = FLOWI_FLAG_ANYSRC,
467 .flowlabel = ip6_flowinfo(ip6h),
468 .flowi6_mark = skb->mark,
469 .flowi6_proto = ip6h->nexthdr,
471 struct dst_entry *dst;
474 dst = ip6_route_output(dev_net(dev), NULL, &fl6);
480 skb_dst_set(skb, dst);
484 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
486 struct net_device *dev = skb->dev;
487 int err, ret = NET_XMIT_DROP;
489 err = ipvlan_route_v6_outbound(dev, skb);
491 DEV_STATS_INC(dev, tx_errors);
496 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
498 err = ip6_local_out(dev_net(dev), skb->sk, skb);
499 if (unlikely(net_xmit_eval(err)))
500 DEV_STATS_INC(dev, tx_errors);
502 ret = NET_XMIT_SUCCESS;
506 static int ipvlan_process_v6_outbound(struct sk_buff *skb)
508 return NET_XMIT_DROP;
512 static int ipvlan_process_outbound(struct sk_buff *skb)
514 int ret = NET_XMIT_DROP;
516 /* The ipvlan is a pseudo-L2 device, so the packets that we receive
517 * will have L2; which need to discarded and processed further
518 * in the net-ns of the main-device.
520 if (skb_mac_header_was_set(skb)) {
521 /* In this mode we dont care about
522 * multicast and broadcast traffic */
523 struct ethhdr *ethh = eth_hdr(skb);
525 if (is_multicast_ether_addr(ethh->h_dest)) {
526 pr_debug_ratelimited(
527 "Dropped {multi|broad}cast of type=[%x]\n",
528 ntohs(skb->protocol));
533 skb_pull(skb, sizeof(*ethh));
534 skb->mac_header = (typeof(skb->mac_header))~0U;
535 skb_reset_network_header(skb);
538 if (skb->protocol == htons(ETH_P_IPV6))
539 ret = ipvlan_process_v6_outbound(skb);
540 else if (skb->protocol == htons(ETH_P_IP))
541 ret = ipvlan_process_v4_outbound(skb);
543 pr_warn_ratelimited("Dropped outbound packet type=%x\n",
544 ntohs(skb->protocol));
551 static void ipvlan_multicast_enqueue(struct ipvl_port *port,
552 struct sk_buff *skb, bool tx_pkt)
554 if (skb->protocol == htons(ETH_P_PAUSE)) {
559 /* Record that the deferred packet is from TX or RX path. By
560 * looking at mac-addresses on packet will lead to erronus decisions.
561 * (This would be true for a loopback-mode on master device or a
562 * hair-pin mode of the switch.)
564 IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
566 spin_lock(&port->backlog.lock);
567 if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
570 __skb_queue_tail(&port->backlog, skb);
571 spin_unlock(&port->backlog.lock);
572 schedule_work(&port->wq);
574 spin_unlock(&port->backlog.lock);
575 atomic_long_inc(&skb->dev->rx_dropped);
580 static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
582 const struct ipvl_dev *ipvlan = netdev_priv(dev);
584 struct ipvl_addr *addr;
587 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
591 if (!ipvlan_is_vepa(ipvlan->port)) {
592 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
594 if (ipvlan_is_private(ipvlan->port)) {
596 return NET_XMIT_DROP;
598 ipvlan_rcv_frame(addr, &skb, true);
599 return NET_XMIT_SUCCESS;
603 ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
604 return ipvlan_process_outbound(skb);
607 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
609 const struct ipvl_dev *ipvlan = netdev_priv(dev);
610 struct ethhdr *eth = skb_eth_hdr(skb);
611 struct ipvl_addr *addr;
615 if (!ipvlan_is_vepa(ipvlan->port) &&
616 ether_addr_equal(eth->h_dest, eth->h_source)) {
617 lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
619 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
621 if (ipvlan_is_private(ipvlan->port)) {
623 return NET_XMIT_DROP;
625 ipvlan_rcv_frame(addr, &skb, true);
626 return NET_XMIT_SUCCESS;
629 skb = skb_share_check(skb, GFP_ATOMIC);
631 return NET_XMIT_DROP;
633 /* Packet definitely does not belong to any of the
634 * virtual devices, but the dest is local. So forward
635 * the skb for the main-dev. At the RX side we just return
636 * RX_PASS for it to be processed further on the stack.
638 dev_forward_skb(ipvlan->phy_dev, skb);
639 return NET_XMIT_SUCCESS;
641 } else if (is_multicast_ether_addr(eth->h_dest)) {
642 skb_reset_mac_header(skb);
643 ipvlan_skb_crossing_ns(skb, NULL);
644 ipvlan_multicast_enqueue(ipvlan->port, skb, true);
645 return NET_XMIT_SUCCESS;
648 skb->dev = ipvlan->phy_dev;
649 return dev_queue_xmit(skb);
652 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
654 struct ipvl_dev *ipvlan = netdev_priv(dev);
655 struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
660 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
665 return ipvlan_xmit_mode_l2(skb, dev);
667 #ifdef CONFIG_IPVLAN_L3S
668 case IPVLAN_MODE_L3S:
670 return ipvlan_xmit_mode_l3(skb, dev);
673 /* Should not reach here */
674 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
678 return NET_XMIT_DROP;
681 static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
683 struct ethhdr *eth = eth_hdr(skb);
684 struct ipvl_addr *addr;
688 if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
689 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
693 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
701 static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
702 struct ipvl_port *port)
706 struct ipvl_addr *addr;
707 struct sk_buff *skb = *pskb;
708 rx_handler_result_t ret = RX_HANDLER_PASS;
710 lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
714 addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
716 ret = ipvlan_rcv_frame(addr, pskb, false);
722 static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
723 struct ipvl_port *port)
725 struct sk_buff *skb = *pskb;
726 struct ethhdr *eth = eth_hdr(skb);
727 rx_handler_result_t ret = RX_HANDLER_PASS;
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);
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.
740 ipvlan_skb_crossing_ns(nskb, NULL);
741 ipvlan_multicast_enqueue(port, nskb, false);
745 /* Perform like l3 mode for non-multicast packet */
746 ret = ipvlan_handle_mode_l3(pskb, port);
752 rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
754 struct sk_buff *skb = *pskb;
755 struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
758 return RX_HANDLER_PASS;
760 switch (port->mode) {
762 return ipvlan_handle_mode_l2(pskb, port);
764 return ipvlan_handle_mode_l3(pskb, port);
765 #ifdef CONFIG_IPVLAN_L3S
766 case IPVLAN_MODE_L3S:
767 return RX_HANDLER_PASS;
771 /* Should not reach here */
772 WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
775 return RX_HANDLER_CONSUMED;