1/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
  2 *
  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.
  7 *
  8 */
  9
 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
 19void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
 20			    unsigned int len, bool success, bool mcast)
 21{
 
 
 
 22	if (likely(success)) {
 23		struct ipvl_pcpu_stats *pcptr;
 24
 25		pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
 26		u64_stats_update_begin(&pcptr->syncp);
 27		pcptr->rx_pkts++;
 28		pcptr->rx_bytes += len;
 29		if (mcast)
 30			pcptr->rx_mcast++;
 31		u64_stats_update_end(&pcptr->syncp);
 32	} else {
 33		this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
 34	}
 35}
 36EXPORT_SYMBOL_GPL(ipvlan_count_rx);
 37
 38#if IS_ENABLED(CONFIG_IPV6)
 39static u8 ipvlan_get_v6_hash(const void *iaddr)
 40{
 41	const struct in6_addr *ip6_addr = iaddr;
 42
 43	return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
 44	       IPVLAN_HASH_MASK;
 45}
 46#else
 47static u8 ipvlan_get_v6_hash(const void *iaddr)
 48{
 49	return 0;
 50}
 51#endif
 52
 53static u8 ipvlan_get_v4_hash(const void *iaddr)
 54{
 55	const struct in_addr *ip4_addr = iaddr;
 56
 57	return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
 58	       IPVLAN_HASH_MASK;
 59}
 60
 61static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
 62{
 63	if (!is_v6 && addr->atype == IPVL_IPV4) {
 64		struct in_addr *i4addr = (struct in_addr *)iaddr;
 65
 66		return addr->ip4addr.s_addr == i4addr->s_addr;
 67#if IS_ENABLED(CONFIG_IPV6)
 68	} else if (is_v6 && addr->atype == IPVL_IPV6) {
 69		struct in6_addr *i6addr = (struct in6_addr *)iaddr;
 70
 71		return ipv6_addr_equal(&addr->ip6addr, i6addr);
 72#endif
 73	}
 74
 75	return false;
 76}
 77
 78static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
 79					       const void *iaddr, bool is_v6)
 80{
 81	struct ipvl_addr *addr;
 82	u8 hash;
 83
 84	hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
 85	       ipvlan_get_v4_hash(iaddr);
 86	hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
 87		if (addr_equal(is_v6, addr, iaddr))
 
 
 
 
 
 88			return addr;
 
 89	return NULL;
 90}
 91
 92void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
 93{
 94	struct ipvl_port *port = ipvlan->port;
 95	u8 hash;
 96
 97	hash = (addr->atype == IPVL_IPV6) ?
 98	       ipvlan_get_v6_hash(&addr->ip6addr) :
 99	       ipvlan_get_v4_hash(&addr->ip4addr);
100	if (hlist_unhashed(&addr->hlnode))
101		hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
102}
103
104void ipvlan_ht_addr_del(struct ipvl_addr *addr)
105{
106	hlist_del_init_rcu(&addr->hlnode);
107}
108
109struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
110				   const void *iaddr, bool is_v6)
111{
112	struct ipvl_addr *addr, *ret = NULL;
113
114	rcu_read_lock();
115	list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
116		if (addr_equal(is_v6, addr, iaddr)) {
117			ret = addr;
118			break;
119		}
120	}
121	rcu_read_unlock();
122	return ret;
123}
124
125bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
126{
127	struct ipvl_dev *ipvlan;
128	bool ret = false;
129
130	rcu_read_lock();
131	list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
132		if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
133			ret = true;
134			break;
135		}
136	}
137	rcu_read_unlock();
138	return ret;
139}
140
141static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
142{
143	void *lyr3h = NULL;
144
145	switch (skb->protocol) {
146	case htons(ETH_P_ARP): {
147		struct arphdr *arph;
148
149		if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
150			return NULL;
151
152		arph = arp_hdr(skb);
153		*type = IPVL_ARP;
154		lyr3h = arph;
155		break;
156	}
157	case htons(ETH_P_IP): {
158		u32 pktlen;
159		struct iphdr *ip4h;
160
161		if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
162			return NULL;
163
164		ip4h = ip_hdr(skb);
165		pktlen = ntohs(ip4h->tot_len);
166		if (ip4h->ihl < 5 || ip4h->version != 4)
167			return NULL;
168		if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
169			return NULL;
170
171		*type = IPVL_IPV4;
172		lyr3h = ip4h;
173		break;
174	}
175#if IS_ENABLED(CONFIG_IPV6)
176	case htons(ETH_P_IPV6): {
177		struct ipv6hdr *ip6h;
178
179		if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
180			return NULL;
181
182		ip6h = ipv6_hdr(skb);
183		if (ip6h->version != 6)
184			return NULL;
185
186		*type = IPVL_IPV6;
187		lyr3h = ip6h;
188		/* Only Neighbour Solicitation pkts need different treatment */
189		if (ipv6_addr_any(&ip6h->saddr) &&
190		    ip6h->nexthdr == NEXTHDR_ICMP) {
191			struct icmp6hdr	*icmph;
192
193			if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
194				return NULL;
195
196			ip6h = ipv6_hdr(skb);
197			icmph = (struct icmp6hdr *)(ip6h + 1);
198
199			if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
200				/* Need to access the ipv6 address in body */
201				if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
202						+ sizeof(struct in6_addr))))
203					return NULL;
204
205				ip6h = ipv6_hdr(skb);
206				icmph = (struct icmp6hdr *)(ip6h + 1);
207			}
208
209			*type = IPVL_ICMPV6;
210			lyr3h = icmph;
211		}
212		break;
213	}
214#endif
215	default:
216		return NULL;
217	}
218
219	return lyr3h;
220}
221
222unsigned int ipvlan_mac_hash(const unsigned char *addr)
223{
224	u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
225			       ipvlan_jhash_secret);
226
227	return hash & IPVLAN_MAC_FILTER_MASK;
228}
229
230void ipvlan_process_multicast(struct work_struct *work)
231{
232	struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
233	struct ethhdr *ethh;
234	struct ipvl_dev *ipvlan;
235	struct sk_buff *skb, *nskb;
236	struct sk_buff_head list;
237	unsigned int len;
238	unsigned int mac_hash;
239	int ret;
240	u8 pkt_type;
241	bool tx_pkt;
242
243	__skb_queue_head_init(&list);
244
245	spin_lock_bh(&port->backlog.lock);
246	skb_queue_splice_tail_init(&port->backlog, &list);
247	spin_unlock_bh(&port->backlog.lock);
248
249	while ((skb = __skb_dequeue(&list)) != NULL) {
250		struct net_device *dev = skb->dev;
251		bool consumed = false;
252
253		ethh = eth_hdr(skb);
254		tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
255		mac_hash = ipvlan_mac_hash(ethh->h_dest);
256
257		if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
258			pkt_type = PACKET_BROADCAST;
259		else
260			pkt_type = PACKET_MULTICAST;
261
 
262		rcu_read_lock();
263		list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
264			if (tx_pkt && (ipvlan->dev == skb->dev))
 
265				continue;
 
266			if (!test_bit(mac_hash, ipvlan->mac_filters))
267				continue;
268			if (!(ipvlan->dev->flags & IFF_UP))
269				continue;
270			ret = NET_RX_DROP;
271			len = skb->len + ETH_HLEN;
272			nskb = skb_clone(skb, GFP_ATOMIC);
273			local_bh_disable();
274			if (nskb) {
275				consumed = true;
276				nskb->pkt_type = pkt_type;
277				nskb->dev = ipvlan->dev;
278				if (tx_pkt)
279					ret = dev_forward_skb(ipvlan->dev, nskb);
280				else
281					ret = netif_rx(nskb);
282			}
283			ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
284			local_bh_enable();
285		}
286		rcu_read_unlock();
287
288		if (tx_pkt) {
289			/* If the packet originated here, send it out. */
290			skb->dev = port->dev;
291			skb->pkt_type = pkt_type;
292			dev_queue_xmit(skb);
293		} else {
294			if (consumed)
295				consume_skb(skb);
296			else
297				kfree_skb(skb);
298		}
299		if (dev)
300			dev_put(dev);
301	}
302}
303
304static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
305{
306	bool xnet = true;
307
308	if (dev)
309		xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
310
311	skb_scrub_packet(skb, xnet);
312	if (dev)
313		skb->dev = dev;
314}
315
316static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
317			    bool local)
318{
319	struct ipvl_dev *ipvlan = addr->master;
320	struct net_device *dev = ipvlan->dev;
321	unsigned int len;
322	rx_handler_result_t ret = RX_HANDLER_CONSUMED;
323	bool success = false;
324	struct sk_buff *skb = *pskb;
325
326	len = skb->len + ETH_HLEN;
327	/* Only packets exchanged between two local slaves need to have
328	 * device-up check as well as skb-share check.
329	 */
330	if (local) {
331		if (unlikely(!(dev->flags & IFF_UP))) {
332			kfree_skb(skb);
333			goto out;
334		}
335
336		skb = skb_share_check(skb, GFP_ATOMIC);
337		if (!skb)
338			goto out;
339
340		*pskb = skb;
341	}
 
342
343	if (local) {
344		skb->pkt_type = PACKET_HOST;
345		if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
346			success = true;
347	} else {
348		skb->dev = dev;
349		ret = RX_HANDLER_ANOTHER;
350		success = true;
351	}
352
353out:
354	ipvlan_count_rx(ipvlan, len, success, false);
355	return ret;
356}
357
358static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
359					    void *lyr3h, int addr_type,
360					    bool use_dest)
361{
362	struct ipvl_addr *addr = NULL;
363
364	switch (addr_type) {
365#if IS_ENABLED(CONFIG_IPV6)
366	case IPVL_IPV6: {
367		struct ipv6hdr *ip6h;
368		struct in6_addr *i6addr;
369
370		ip6h = (struct ipv6hdr *)lyr3h;
371		i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
372		addr = ipvlan_ht_addr_lookup(port, i6addr, true);
373		break;
374	}
375	case IPVL_ICMPV6: {
376		struct nd_msg *ndmh;
377		struct in6_addr *i6addr;
378
379		/* Make sure that the NeighborSolicitation ICMPv6 packets
380		 * are handled to avoid DAD issue.
381		 */
382		ndmh = (struct nd_msg *)lyr3h;
383		if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
384			i6addr = &ndmh->target;
385			addr = ipvlan_ht_addr_lookup(port, i6addr, true);
386		}
387		break;
388	}
389#endif
390	case IPVL_IPV4: {
391		struct iphdr *ip4h;
392		__be32 *i4addr;
393
394		ip4h = (struct iphdr *)lyr3h;
395		i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
396		addr = ipvlan_ht_addr_lookup(port, i4addr, false);
397		break;
398	}
399	case IPVL_ARP: {
400		struct arphdr *arph;
401		unsigned char *arp_ptr;
402		__be32 dip;
403
404		arph = (struct arphdr *)lyr3h;
405		arp_ptr = (unsigned char *)(arph + 1);
406		if (use_dest)
407			arp_ptr += (2 * port->dev->addr_len) + 4;
408		else
409			arp_ptr += port->dev->addr_len;
410
411		memcpy(&dip, arp_ptr, 4);
412		addr = ipvlan_ht_addr_lookup(port, &dip, false);
413		break;
414	}
415	}
416
417	return addr;
418}
419
420static int ipvlan_process_v4_outbound(struct sk_buff *skb)
421{
422	const struct iphdr *ip4h = ip_hdr(skb);
423	struct net_device *dev = skb->dev;
424	struct net *net = dev_net(dev);
425	struct rtable *rt;
426	int err, ret = NET_XMIT_DROP;
427	struct flowi4 fl4 = {
428		.flowi4_oif = dev->ifindex,
429		.flowi4_tos = RT_TOS(ip4h->tos),
430		.flowi4_flags = FLOWI_FLAG_ANYSRC,
431		.flowi4_mark = skb->mark,
432		.daddr = ip4h->daddr,
433		.saddr = ip4h->saddr,
434	};
435
436	rt = ip_route_output_flow(net, &fl4, NULL);
437	if (IS_ERR(rt))
438		goto err;
439
440	if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
441		ip_rt_put(rt);
442		goto err;
443	}
 
444	skb_dst_set(skb, &rt->dst);
445	err = ip_local_out(net, skb->sk, skb);
446	if (unlikely(net_xmit_eval(err)))
447		dev->stats.tx_errors++;
448	else
449		ret = NET_XMIT_SUCCESS;
450	goto out;
451err:
452	dev->stats.tx_errors++;
453	kfree_skb(skb);
454out:
455	return ret;
456}
457
458#if IS_ENABLED(CONFIG_IPV6)
459static int ipvlan_process_v6_outbound(struct sk_buff *skb)
460{
461	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
462	struct net_device *dev = skb->dev;
463	struct net *net = dev_net(dev);
464	struct dst_entry *dst;
465	int err, ret = NET_XMIT_DROP;
466	struct flowi6 fl6 = {
467		.flowi6_oif = dev->ifindex,
468		.daddr = ip6h->daddr,
469		.saddr = ip6h->saddr,
470		.flowi6_flags = FLOWI_FLAG_ANYSRC,
471		.flowlabel = ip6_flowinfo(ip6h),
472		.flowi6_mark = skb->mark,
473		.flowi6_proto = ip6h->nexthdr,
474	};
475
476	dst = ip6_route_output(net, NULL, &fl6);
477	if (dst->error) {
478		ret = dst->error;
479		dst_release(dst);
480		goto err;
481	}
 
482	skb_dst_set(skb, dst);
483	err = ip6_local_out(net, skb->sk, skb);
484	if (unlikely(net_xmit_eval(err)))
485		dev->stats.tx_errors++;
486	else
487		ret = NET_XMIT_SUCCESS;
488	goto out;
489err:
490	dev->stats.tx_errors++;
491	kfree_skb(skb);
492out:
493	return ret;
494}
495#else
496static int ipvlan_process_v6_outbound(struct sk_buff *skb)
497{
498	return NET_XMIT_DROP;
499}
500#endif
501
502static int ipvlan_process_outbound(struct sk_buff *skb)
503{
504	struct ethhdr *ethh = eth_hdr(skb);
505	int ret = NET_XMIT_DROP;
506
507	/* In this mode we dont care about multicast and broadcast traffic */
508	if (is_multicast_ether_addr(ethh->h_dest)) {
509		pr_debug_ratelimited("Dropped {multi|broad}cast of type=[%x]\n",
510				     ntohs(skb->protocol));
511		kfree_skb(skb);
512		goto out;
513	}
514
515	/* The ipvlan is a pseudo-L2 device, so the packets that we receive
516	 * will have L2; which need to discarded and processed further
517	 * in the net-ns of the main-device.
518	 */
519	if (skb_mac_header_was_set(skb)) {
520		skb_pull(skb, sizeof(*ethh));
521		skb->mac_header = (typeof(skb->mac_header))~0U;
522		skb_reset_network_header(skb);
523	}
524
525	if (skb->protocol == htons(ETH_P_IPV6))
526		ret = ipvlan_process_v6_outbound(skb);
527	else if (skb->protocol == htons(ETH_P_IP))
528		ret = ipvlan_process_v4_outbound(skb);
529	else {
530		pr_warn_ratelimited("Dropped outbound packet type=%x\n",
531				    ntohs(skb->protocol));
532		kfree_skb(skb);
533	}
534out:
535	return ret;
536}
537
538static void ipvlan_multicast_enqueue(struct ipvl_port *port,
539				     struct sk_buff *skb, bool tx_pkt)
540{
541	if (skb->protocol == htons(ETH_P_PAUSE)) {
542		kfree_skb(skb);
543		return;
544	}
545
546	/* Record that the deferred packet is from TX or RX path. By
547	 * looking at mac-addresses on packet will lead to erronus decisions.
548	 * (This would be true for a loopback-mode on master device or a
549	 * hair-pin mode of the switch.)
550	 */
551	IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
552
553	spin_lock(&port->backlog.lock);
554	if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
555		if (skb->dev)
556			dev_hold(skb->dev);
557		__skb_queue_tail(&port->backlog, skb);
558		spin_unlock(&port->backlog.lock);
559		schedule_work(&port->wq);
560	} else {
561		spin_unlock(&port->backlog.lock);
562		atomic_long_inc(&skb->dev->rx_dropped);
563		kfree_skb(skb);
564	}
565}
566
567static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev)
568{
569	const struct ipvl_dev *ipvlan = netdev_priv(dev);
570	void *lyr3h;
571	struct ipvl_addr *addr;
572	int addr_type;
 
573
574	lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
575	if (!lyr3h)
576		goto out;
577
578	if (!ipvlan_is_vepa(ipvlan->port)) {
579		addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
580		if (addr) {
581			if (ipvlan_is_private(ipvlan->port)) {
582				consume_skb(skb);
583				return NET_XMIT_DROP;
584			}
585			return ipvlan_rcv_frame(addr, &skb, true);
586		}
587	}
588out:
589	ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
590	return ipvlan_process_outbound(skb);
 
591}
592
593static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
594{
595	const struct ipvl_dev *ipvlan = netdev_priv(dev);
596	struct ethhdr *eth = eth_hdr(skb);
597	struct ipvl_addr *addr;
598	void *lyr3h;
599	int addr_type;
600
601	if (!ipvlan_is_vepa(ipvlan->port) &&
602	    ether_addr_equal(eth->h_dest, eth->h_source)) {
603		lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
604		if (lyr3h) {
605			addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
606			if (addr) {
607				if (ipvlan_is_private(ipvlan->port)) {
608					consume_skb(skb);
609					return NET_XMIT_DROP;
610				}
611				return ipvlan_rcv_frame(addr, &skb, true);
612			}
613		}
614		skb = skb_share_check(skb, GFP_ATOMIC);
615		if (!skb)
616			return NET_XMIT_DROP;
617
618		/* Packet definitely does not belong to any of the
619		 * virtual devices, but the dest is local. So forward
620		 * the skb for the main-dev. At the RX side we just return
621		 * RX_PASS for it to be processed further on the stack.
622		 */
623		return dev_forward_skb(ipvlan->phy_dev, skb);
624
625	} else if (is_multicast_ether_addr(eth->h_dest)) {
626		ipvlan_skb_crossing_ns(skb, NULL);
627		ipvlan_multicast_enqueue(ipvlan->port, skb, true);
628		return NET_XMIT_SUCCESS;
629	}
630
631	skb->dev = ipvlan->phy_dev;
632	return dev_queue_xmit(skb);
633}
634
635int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
636{
637	struct ipvl_dev *ipvlan = netdev_priv(dev);
638	struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev);
639
640	if (!port)
641		goto out;
642
643	if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
644		goto out;
645
646	switch(port->mode) {
647	case IPVLAN_MODE_L2:
648		return ipvlan_xmit_mode_l2(skb, dev);
649	case IPVLAN_MODE_L3:
650	case IPVLAN_MODE_L3S:
651		return ipvlan_xmit_mode_l3(skb, dev);
652	}
653
654	/* Should not reach here */
655	WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
656			  port->mode);
657out:
658	kfree_skb(skb);
659	return NET_XMIT_DROP;
660}
661
662static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port)
663{
664	struct ethhdr *eth = eth_hdr(skb);
665	struct ipvl_addr *addr;
666	void *lyr3h;
667	int addr_type;
668
669	if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) {
670		lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
671		if (!lyr3h)
672			return true;
673
674		addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false);
675		if (addr)
676			return false;
677	}
678
679	return true;
680}
681
682static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb,
683						 struct ipvl_port *port)
684{
685	void *lyr3h;
686	int addr_type;
687	struct ipvl_addr *addr;
688	struct sk_buff *skb = *pskb;
689	rx_handler_result_t ret = RX_HANDLER_PASS;
690
691	lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
692	if (!lyr3h)
693		goto out;
694
695	addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
696	if (addr)
697		ret = ipvlan_rcv_frame(addr, pskb, false);
698
699out:
700	return ret;
701}
702
703static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb,
704						 struct ipvl_port *port)
705{
706	struct sk_buff *skb = *pskb;
707	struct ethhdr *eth = eth_hdr(skb);
708	rx_handler_result_t ret = RX_HANDLER_PASS;
 
 
709
710	if (is_multicast_ether_addr(eth->h_dest)) {
711		if (ipvlan_external_frame(skb, port)) {
712			struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
713
714			/* External frames are queued for device local
715			 * distribution, but a copy is given to master
716			 * straight away to avoid sending duplicates later
717			 * when work-queue processes this frame. This is
718			 * achieved by returning RX_HANDLER_PASS.
719			 */
720			if (nskb) {
721				ipvlan_skb_crossing_ns(nskb, NULL);
722				ipvlan_multicast_enqueue(port, nskb, false);
723			}
724		}
725	} else {
726		/* Perform like l3 mode for non-multicast packet */
727		ret = ipvlan_handle_mode_l3(pskb, port);
 
 
 
 
 
 
 
728	}
729
730	return ret;
731}
732
733rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb)
734{
735	struct sk_buff *skb = *pskb;
736	struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev);
737
738	if (!port)
739		return RX_HANDLER_PASS;
740
741	switch (port->mode) {
742	case IPVLAN_MODE_L2:
743		return ipvlan_handle_mode_l2(pskb, port);
744	case IPVLAN_MODE_L3:
745		return ipvlan_handle_mode_l3(pskb, port);
746	case IPVLAN_MODE_L3S:
747		return RX_HANDLER_PASS;
748	}
749
750	/* Should not reach here */
751	WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
752			  port->mode);
753	kfree_skb(skb);
754	return RX_HANDLER_CONSUMED;
755}
756
757static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
758					    struct net_device *dev)
759{
760	struct ipvl_addr *addr = NULL;
761	struct ipvl_port *port;
762	void *lyr3h;
763	int addr_type;
764
765	if (!dev || !netif_is_ipvlan_port(dev))
766		goto out;
767
768	port = ipvlan_port_get_rcu(dev);
769	if (!port || port->mode != IPVLAN_MODE_L3S)
770		goto out;
771
772	lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
773	if (!lyr3h)
774		goto out;
775
776	addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
777out:
778	return addr;
779}
780
781struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
782			      u16 proto)
783{
784	struct ipvl_addr *addr;
785	struct net_device *sdev;
786
787	addr = ipvlan_skb_to_addr(skb, dev);
788	if (!addr)
789		goto out;
790
791	sdev = addr->master->dev;
792	switch (proto) {
793	case AF_INET:
794	{
795		int err;
796		struct iphdr *ip4h = ip_hdr(skb);
797
798		err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
799					   ip4h->tos, sdev);
800		if (unlikely(err))
801			goto out;
802		break;
803	}
804#if IS_ENABLED(CONFIG_IPV6)
805	case AF_INET6:
806	{
807		struct dst_entry *dst;
808		struct ipv6hdr *ip6h = ipv6_hdr(skb);
809		int flags = RT6_LOOKUP_F_HAS_SADDR;
810		struct flowi6 fl6 = {
811			.flowi6_iif   = sdev->ifindex,
812			.daddr        = ip6h->daddr,
813			.saddr        = ip6h->saddr,
814			.flowlabel    = ip6_flowinfo(ip6h),
815			.flowi6_mark  = skb->mark,
816			.flowi6_proto = ip6h->nexthdr,
817		};
818
819		skb_dst_drop(skb);
820		dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6,
821					     skb, flags);
822		skb_dst_set(skb, dst);
823		break;
824	}
825#endif
826	default:
827		break;
828	}
829
830out:
831	return skb;
832}
833
834unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
835			     const struct nf_hook_state *state)
836{
837	struct ipvl_addr *addr;
838	unsigned int len;
839
840	addr = ipvlan_skb_to_addr(skb, skb->dev);
841	if (!addr)
842		goto out;
843
844	skb->dev = addr->master->dev;
845	len = skb->len + ETH_HLEN;
846	ipvlan_count_rx(addr->master, len, true, false);
847out:
848	return NF_ACCEPT;
849}