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_get_iflink(dev
),
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",