Commit | Line | Data |
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2ad7bf36 MB |
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 | ||
207895fd | 12 | static u32 ipvlan_jhash_secret __read_mostly; |
2ad7bf36 MB |
13 | |
14 | void ipvlan_init_secret(void) | |
15 | { | |
16 | net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret)); | |
17 | } | |
18 | ||
19 | static void ipvlan_count_rx(const struct ipvl_dev *ipvlan, | |
20 | unsigned int len, bool success, bool mcast) | |
21 | { | |
22 | if (!ipvlan) | |
23 | return; | |
24 | ||
25 | if (likely(success)) { | |
26 | struct ipvl_pcpu_stats *pcptr; | |
27 | ||
28 | pcptr = this_cpu_ptr(ipvlan->pcpu_stats); | |
29 | u64_stats_update_begin(&pcptr->syncp); | |
30 | pcptr->rx_pkts++; | |
31 | pcptr->rx_bytes += len; | |
32 | if (mcast) | |
33 | pcptr->rx_mcast++; | |
34 | u64_stats_update_end(&pcptr->syncp); | |
35 | } else { | |
36 | this_cpu_inc(ipvlan->pcpu_stats->rx_errs); | |
37 | } | |
38 | } | |
39 | ||
40 | static u8 ipvlan_get_v6_hash(const void *iaddr) | |
41 | { | |
42 | const struct in6_addr *ip6_addr = iaddr; | |
43 | ||
44 | return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) & | |
45 | IPVLAN_HASH_MASK; | |
46 | } | |
47 | ||
48 | static u8 ipvlan_get_v4_hash(const void *iaddr) | |
49 | { | |
50 | const struct in_addr *ip4_addr = iaddr; | |
51 | ||
52 | return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) & | |
53 | IPVLAN_HASH_MASK; | |
54 | } | |
55 | ||
ab5b7013 MB |
56 | static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, |
57 | const void *iaddr, bool is_v6) | |
2ad7bf36 MB |
58 | { |
59 | struct ipvl_addr *addr; | |
60 | u8 hash; | |
61 | ||
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)) | |
67 | return addr; | |
68 | else if (!is_v6 && addr->atype == IPVL_IPV4 && | |
69 | addr->ip4addr.s_addr == | |
70 | ((struct in_addr *)iaddr)->s_addr) | |
71 | return addr; | |
72 | } | |
73 | return NULL; | |
74 | } | |
75 | ||
76 | void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr) | |
77 | { | |
78 | struct ipvl_port *port = ipvlan->port; | |
79 | u8 hash; | |
80 | ||
81 | hash = (addr->atype == IPVL_IPV6) ? | |
82 | ipvlan_get_v6_hash(&addr->ip6addr) : | |
83 | ipvlan_get_v4_hash(&addr->ip4addr); | |
27705f70 JB |
84 | if (hlist_unhashed(&addr->hlnode)) |
85 | hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); | |
2ad7bf36 MB |
86 | } |
87 | ||
6640e673 | 88 | void ipvlan_ht_addr_del(struct ipvl_addr *addr) |
2ad7bf36 | 89 | { |
27705f70 | 90 | hlist_del_init_rcu(&addr->hlnode); |
2ad7bf36 MB |
91 | } |
92 | ||
e9997c29 JB |
93 | struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, |
94 | const void *iaddr, bool is_v6) | |
2ad7bf36 | 95 | { |
2ad7bf36 MB |
96 | struct ipvl_addr *addr; |
97 | ||
98 | list_for_each_entry(addr, &ipvlan->addrs, anode) { | |
99 | if ((is_v6 && addr->atype == IPVL_IPV6 && | |
100 | ipv6_addr_equal(&addr->ip6addr, iaddr)) || | |
101 | (!is_v6 && addr->atype == IPVL_IPV4 && | |
102 | addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr)) | |
e9997c29 | 103 | return addr; |
2ad7bf36 | 104 | } |
e9997c29 JB |
105 | return NULL; |
106 | } | |
2ad7bf36 | 107 | |
e9997c29 JB |
108 | bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) |
109 | { | |
110 | struct ipvl_dev *ipvlan; | |
2ad7bf36 | 111 | |
e9997c29 | 112 | ASSERT_RTNL(); |
2ad7bf36 | 113 | |
e9997c29 JB |
114 | list_for_each_entry(ipvlan, &port->ipvlans, pnode) { |
115 | if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) | |
116 | return true; | |
117 | } | |
2ad7bf36 MB |
118 | return false; |
119 | } | |
120 | ||
121 | static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type) | |
122 | { | |
123 | void *lyr3h = NULL; | |
124 | ||
125 | switch (skb->protocol) { | |
126 | case htons(ETH_P_ARP): { | |
127 | struct arphdr *arph; | |
128 | ||
129 | if (unlikely(!pskb_may_pull(skb, sizeof(*arph)))) | |
130 | return NULL; | |
131 | ||
132 | arph = arp_hdr(skb); | |
133 | *type = IPVL_ARP; | |
134 | lyr3h = arph; | |
135 | break; | |
136 | } | |
137 | case htons(ETH_P_IP): { | |
138 | u32 pktlen; | |
139 | struct iphdr *ip4h; | |
140 | ||
141 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) | |
142 | return NULL; | |
143 | ||
144 | ip4h = ip_hdr(skb); | |
145 | pktlen = ntohs(ip4h->tot_len); | |
146 | if (ip4h->ihl < 5 || ip4h->version != 4) | |
147 | return NULL; | |
148 | if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) | |
149 | return NULL; | |
150 | ||
151 | *type = IPVL_IPV4; | |
152 | lyr3h = ip4h; | |
153 | break; | |
154 | } | |
155 | case htons(ETH_P_IPV6): { | |
156 | struct ipv6hdr *ip6h; | |
157 | ||
158 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) | |
159 | return NULL; | |
160 | ||
161 | ip6h = ipv6_hdr(skb); | |
162 | if (ip6h->version != 6) | |
163 | return NULL; | |
164 | ||
165 | *type = IPVL_IPV6; | |
166 | lyr3h = ip6h; | |
167 | /* Only Neighbour Solicitation pkts need different treatment */ | |
168 | if (ipv6_addr_any(&ip6h->saddr) && | |
169 | ip6h->nexthdr == NEXTHDR_ICMP) { | |
170 | *type = IPVL_ICMPV6; | |
171 | lyr3h = ip6h + 1; | |
172 | } | |
173 | break; | |
174 | } | |
175 | default: | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | return lyr3h; | |
180 | } | |
181 | ||
182 | unsigned int ipvlan_mac_hash(const unsigned char *addr) | |
183 | { | |
184 | u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), | |
185 | ipvlan_jhash_secret); | |
186 | ||
187 | return hash & IPVLAN_MAC_FILTER_MASK; | |
188 | } | |
189 | ||
ba35f858 | 190 | void ipvlan_process_multicast(struct work_struct *work) |
2ad7bf36 | 191 | { |
ba35f858 MB |
192 | struct ipvl_port *port = container_of(work, struct ipvl_port, wq); |
193 | struct ethhdr *ethh; | |
2ad7bf36 | 194 | struct ipvl_dev *ipvlan; |
ba35f858 MB |
195 | struct sk_buff *skb, *nskb; |
196 | struct sk_buff_head list; | |
2ad7bf36 MB |
197 | unsigned int len; |
198 | unsigned int mac_hash; | |
199 | int ret; | |
ba35f858 | 200 | u8 pkt_type; |
e2525360 | 201 | bool tx_pkt; |
2ad7bf36 | 202 | |
ba35f858 | 203 | __skb_queue_head_init(&list); |
2ad7bf36 | 204 | |
ba35f858 MB |
205 | spin_lock_bh(&port->backlog.lock); |
206 | skb_queue_splice_tail_init(&port->backlog, &list); | |
207 | spin_unlock_bh(&port->backlog.lock); | |
2ad7bf36 | 208 | |
ba35f858 | 209 | while ((skb = __skb_dequeue(&list)) != NULL) { |
b1227d01 ED |
210 | struct net_device *dev = skb->dev; |
211 | bool consumed = false; | |
212 | ||
ba35f858 | 213 | ethh = eth_hdr(skb); |
e2525360 | 214 | tx_pkt = IPVL_SKB_CB(skb)->tx_pkt; |
ba35f858 | 215 | mac_hash = ipvlan_mac_hash(ethh->h_dest); |
2ad7bf36 | 216 | |
ba35f858 MB |
217 | if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) |
218 | pkt_type = PACKET_BROADCAST; | |
2ad7bf36 | 219 | else |
ba35f858 MB |
220 | pkt_type = PACKET_MULTICAST; |
221 | ||
ba35f858 MB |
222 | rcu_read_lock(); |
223 | list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { | |
e2525360 | 224 | if (tx_pkt && (ipvlan->dev == skb->dev)) |
ba35f858 | 225 | continue; |
ba35f858 MB |
226 | if (!test_bit(mac_hash, ipvlan->mac_filters)) |
227 | continue; | |
b1227d01 ED |
228 | if (!(ipvlan->dev->flags & IFF_UP)) |
229 | continue; | |
ba35f858 MB |
230 | ret = NET_RX_DROP; |
231 | len = skb->len + ETH_HLEN; | |
232 | nskb = skb_clone(skb, GFP_ATOMIC); | |
b1227d01 ED |
233 | local_bh_disable(); |
234 | if (nskb) { | |
235 | consumed = true; | |
236 | nskb->pkt_type = pkt_type; | |
237 | nskb->dev = ipvlan->dev; | |
e2525360 | 238 | if (tx_pkt) |
b1227d01 ED |
239 | ret = dev_forward_skb(ipvlan->dev, nskb); |
240 | else | |
241 | ret = netif_rx(nskb); | |
242 | } | |
ba35f858 | 243 | ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); |
b1227d01 | 244 | local_bh_enable(); |
ba35f858 MB |
245 | } |
246 | rcu_read_unlock(); | |
247 | ||
e2525360 | 248 | if (tx_pkt) { |
ba35f858 MB |
249 | /* If the packet originated here, send it out. */ |
250 | skb->dev = port->dev; | |
251 | skb->pkt_type = pkt_type; | |
252 | dev_queue_xmit(skb); | |
253 | } else { | |
b1227d01 ED |
254 | if (consumed) |
255 | consume_skb(skb); | |
256 | else | |
257 | kfree_skb(skb); | |
2ad7bf36 | 258 | } |
b1227d01 ED |
259 | if (dev) |
260 | dev_put(dev); | |
2ad7bf36 MB |
261 | } |
262 | } | |
263 | ||
b93dd49c MB |
264 | static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev) |
265 | { | |
266 | bool xnet = true; | |
267 | ||
268 | if (dev) | |
269 | xnet = !net_eq(dev_net(skb->dev), dev_net(dev)); | |
270 | ||
271 | skb_scrub_packet(skb, xnet); | |
272 | if (dev) | |
273 | skb->dev = dev; | |
274 | } | |
275 | ||
cf554ada | 276 | static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, |
2ad7bf36 MB |
277 | bool local) |
278 | { | |
279 | struct ipvl_dev *ipvlan = addr->master; | |
280 | struct net_device *dev = ipvlan->dev; | |
281 | unsigned int len; | |
282 | rx_handler_result_t ret = RX_HANDLER_CONSUMED; | |
283 | bool success = false; | |
cf554ada | 284 | struct sk_buff *skb = *pskb; |
2ad7bf36 MB |
285 | |
286 | len = skb->len + ETH_HLEN; | |
ab5b7013 MB |
287 | /* Only packets exchanged between two local slaves need to have |
288 | * device-up check as well as skb-share check. | |
289 | */ | |
290 | if (local) { | |
291 | if (unlikely(!(dev->flags & IFF_UP))) { | |
292 | kfree_skb(skb); | |
293 | goto out; | |
294 | } | |
2ad7bf36 | 295 | |
ab5b7013 MB |
296 | skb = skb_share_check(skb, GFP_ATOMIC); |
297 | if (!skb) | |
298 | goto out; | |
2ad7bf36 | 299 | |
ab5b7013 MB |
300 | *pskb = skb; |
301 | } | |
b93dd49c | 302 | ipvlan_skb_crossing_ns(skb, dev); |
2ad7bf36 MB |
303 | |
304 | if (local) { | |
ab5b7013 | 305 | skb->pkt_type = PACKET_HOST; |
2ad7bf36 MB |
306 | if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) |
307 | success = true; | |
308 | } else { | |
309 | ret = RX_HANDLER_ANOTHER; | |
310 | success = true; | |
311 | } | |
312 | ||
313 | out: | |
314 | ipvlan_count_rx(ipvlan, len, success, false); | |
315 | return ret; | |
316 | } | |
317 | ||
318 | static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, | |
319 | void *lyr3h, int addr_type, | |
320 | bool use_dest) | |
321 | { | |
322 | struct ipvl_addr *addr = NULL; | |
323 | ||
324 | if (addr_type == IPVL_IPV6) { | |
325 | struct ipv6hdr *ip6h; | |
326 | struct in6_addr *i6addr; | |
327 | ||
328 | ip6h = (struct ipv6hdr *)lyr3h; | |
329 | i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; | |
330 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
331 | } else if (addr_type == IPVL_ICMPV6) { | |
332 | struct nd_msg *ndmh; | |
333 | struct in6_addr *i6addr; | |
334 | ||
335 | /* Make sure that the NeighborSolicitation ICMPv6 packets | |
336 | * are handled to avoid DAD issue. | |
337 | */ | |
338 | ndmh = (struct nd_msg *)lyr3h; | |
339 | if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { | |
340 | i6addr = &ndmh->target; | |
341 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
342 | } | |
343 | } else if (addr_type == IPVL_IPV4) { | |
344 | struct iphdr *ip4h; | |
345 | __be32 *i4addr; | |
346 | ||
347 | ip4h = (struct iphdr *)lyr3h; | |
348 | i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; | |
349 | addr = ipvlan_ht_addr_lookup(port, i4addr, false); | |
350 | } else if (addr_type == IPVL_ARP) { | |
351 | struct arphdr *arph; | |
352 | unsigned char *arp_ptr; | |
353 | __be32 dip; | |
354 | ||
355 | arph = (struct arphdr *)lyr3h; | |
356 | arp_ptr = (unsigned char *)(arph + 1); | |
357 | if (use_dest) | |
358 | arp_ptr += (2 * port->dev->addr_len) + 4; | |
359 | else | |
360 | arp_ptr += port->dev->addr_len; | |
361 | ||
362 | memcpy(&dip, arp_ptr, 4); | |
363 | addr = ipvlan_ht_addr_lookup(port, &dip, false); | |
364 | } | |
365 | ||
366 | return addr; | |
367 | } | |
368 | ||
b93dd49c | 369 | static int ipvlan_process_v4_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
370 | { |
371 | const struct iphdr *ip4h = ip_hdr(skb); | |
372 | struct net_device *dev = skb->dev; | |
57c4bf85 | 373 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
374 | struct rtable *rt; |
375 | int err, ret = NET_XMIT_DROP; | |
376 | struct flowi4 fl4 = { | |
63b11e75 | 377 | .flowi4_oif = dev->ifindex, |
2ad7bf36 MB |
378 | .flowi4_tos = RT_TOS(ip4h->tos), |
379 | .flowi4_flags = FLOWI_FLAG_ANYSRC, | |
380 | .daddr = ip4h->daddr, | |
381 | .saddr = ip4h->saddr, | |
382 | }; | |
383 | ||
57c4bf85 | 384 | rt = ip_route_output_flow(net, &fl4, NULL); |
2ad7bf36 MB |
385 | if (IS_ERR(rt)) |
386 | goto err; | |
387 | ||
388 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
389 | ip_rt_put(rt); | |
390 | goto err; | |
391 | } | |
2ad7bf36 | 392 | skb_dst_set(skb, &rt->dst); |
33224b16 | 393 | err = ip_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
394 | if (unlikely(net_xmit_eval(err))) |
395 | dev->stats.tx_errors++; | |
396 | else | |
397 | ret = NET_XMIT_SUCCESS; | |
398 | goto out; | |
399 | err: | |
400 | dev->stats.tx_errors++; | |
401 | kfree_skb(skb); | |
402 | out: | |
403 | return ret; | |
404 | } | |
405 | ||
b93dd49c | 406 | static int ipvlan_process_v6_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
407 | { |
408 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
409 | struct net_device *dev = skb->dev; | |
57c4bf85 | 410 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
411 | struct dst_entry *dst; |
412 | int err, ret = NET_XMIT_DROP; | |
413 | struct flowi6 fl6 = { | |
63b11e75 | 414 | .flowi6_iif = dev->ifindex, |
2ad7bf36 MB |
415 | .daddr = ip6h->daddr, |
416 | .saddr = ip6h->saddr, | |
417 | .flowi6_flags = FLOWI_FLAG_ANYSRC, | |
418 | .flowlabel = ip6_flowinfo(ip6h), | |
419 | .flowi6_mark = skb->mark, | |
420 | .flowi6_proto = ip6h->nexthdr, | |
421 | }; | |
422 | ||
57c4bf85 | 423 | dst = ip6_route_output(net, NULL, &fl6); |
2aab9525 MB |
424 | if (dst->error) { |
425 | ret = dst->error; | |
426 | dst_release(dst); | |
2ad7bf36 | 427 | goto err; |
2aab9525 | 428 | } |
2ad7bf36 | 429 | skb_dst_set(skb, dst); |
33224b16 | 430 | err = ip6_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
431 | if (unlikely(net_xmit_eval(err))) |
432 | dev->stats.tx_errors++; | |
433 | else | |
434 | ret = NET_XMIT_SUCCESS; | |
435 | goto out; | |
436 | err: | |
437 | dev->stats.tx_errors++; | |
438 | kfree_skb(skb); | |
439 | out: | |
440 | return ret; | |
441 | } | |
442 | ||
b93dd49c | 443 | static int ipvlan_process_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
444 | { |
445 | struct ethhdr *ethh = eth_hdr(skb); | |
446 | int ret = NET_XMIT_DROP; | |
447 | ||
448 | /* In this mode we dont care about multicast and broadcast traffic */ | |
449 | if (is_multicast_ether_addr(ethh->h_dest)) { | |
450 | pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n", | |
451 | ntohs(skb->protocol)); | |
452 | kfree_skb(skb); | |
453 | goto out; | |
454 | } | |
455 | ||
456 | /* The ipvlan is a pseudo-L2 device, so the packets that we receive | |
457 | * will have L2; which need to discarded and processed further | |
458 | * in the net-ns of the main-device. | |
459 | */ | |
460 | if (skb_mac_header_was_set(skb)) { | |
461 | skb_pull(skb, sizeof(*ethh)); | |
462 | skb->mac_header = (typeof(skb->mac_header))~0U; | |
463 | skb_reset_network_header(skb); | |
464 | } | |
465 | ||
466 | if (skb->protocol == htons(ETH_P_IPV6)) | |
b93dd49c | 467 | ret = ipvlan_process_v6_outbound(skb); |
2ad7bf36 | 468 | else if (skb->protocol == htons(ETH_P_IP)) |
b93dd49c | 469 | ret = ipvlan_process_v4_outbound(skb); |
2ad7bf36 MB |
470 | else { |
471 | pr_warn_ratelimited("Dropped outbound packet type=%x\n", | |
472 | ntohs(skb->protocol)); | |
473 | kfree_skb(skb); | |
474 | } | |
475 | out: | |
476 | return ret; | |
477 | } | |
478 | ||
ba35f858 | 479 | static void ipvlan_multicast_enqueue(struct ipvl_port *port, |
e2525360 | 480 | struct sk_buff *skb, bool tx_pkt) |
ba35f858 MB |
481 | { |
482 | if (skb->protocol == htons(ETH_P_PAUSE)) { | |
483 | kfree_skb(skb); | |
484 | return; | |
485 | } | |
486 | ||
e2525360 MB |
487 | /* Record that the deferred packet is from TX or RX path. By |
488 | * looking at mac-addresses on packet will lead to erronus decisions. | |
489 | * (This would be true for a loopback-mode on master device or a | |
490 | * hair-pin mode of the switch.) | |
491 | */ | |
492 | IPVL_SKB_CB(skb)->tx_pkt = tx_pkt; | |
493 | ||
ba35f858 MB |
494 | spin_lock(&port->backlog.lock); |
495 | if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { | |
b1227d01 ED |
496 | if (skb->dev) |
497 | dev_hold(skb->dev); | |
ba35f858 MB |
498 | __skb_queue_tail(&port->backlog, skb); |
499 | spin_unlock(&port->backlog.lock); | |
500 | schedule_work(&port->wq); | |
501 | } else { | |
502 | spin_unlock(&port->backlog.lock); | |
503 | atomic_long_inc(&skb->dev->rx_dropped); | |
504 | kfree_skb(skb); | |
505 | } | |
506 | } | |
507 | ||
2ad7bf36 MB |
508 | static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) |
509 | { | |
510 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
511 | void *lyr3h; | |
512 | struct ipvl_addr *addr; | |
513 | int addr_type; | |
514 | ||
515 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
516 | if (!lyr3h) | |
517 | goto out; | |
518 | ||
519 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
520 | if (addr) | |
cf554ada | 521 | return ipvlan_rcv_frame(addr, &skb, true); |
2ad7bf36 MB |
522 | |
523 | out: | |
b93dd49c MB |
524 | ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); |
525 | return ipvlan_process_outbound(skb); | |
2ad7bf36 MB |
526 | } |
527 | ||
528 | static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) | |
529 | { | |
530 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
531 | struct ethhdr *eth = eth_hdr(skb); | |
532 | struct ipvl_addr *addr; | |
533 | void *lyr3h; | |
534 | int addr_type; | |
535 | ||
536 | if (ether_addr_equal(eth->h_dest, eth->h_source)) { | |
537 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
538 | if (lyr3h) { | |
539 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
540 | if (addr) | |
cf554ada | 541 | return ipvlan_rcv_frame(addr, &skb, true); |
2ad7bf36 MB |
542 | } |
543 | skb = skb_share_check(skb, GFP_ATOMIC); | |
544 | if (!skb) | |
545 | return NET_XMIT_DROP; | |
546 | ||
547 | /* Packet definitely does not belong to any of the | |
548 | * virtual devices, but the dest is local. So forward | |
549 | * the skb for the main-dev. At the RX side we just return | |
550 | * RX_PASS for it to be processed further on the stack. | |
551 | */ | |
552 | return dev_forward_skb(ipvlan->phy_dev, skb); | |
553 | ||
554 | } else if (is_multicast_ether_addr(eth->h_dest)) { | |
b93dd49c | 555 | ipvlan_skb_crossing_ns(skb, NULL); |
e2525360 | 556 | ipvlan_multicast_enqueue(ipvlan->port, skb, true); |
ba35f858 | 557 | return NET_XMIT_SUCCESS; |
2ad7bf36 MB |
558 | } |
559 | ||
b93dd49c | 560 | ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); |
2ad7bf36 MB |
561 | return dev_queue_xmit(skb); |
562 | } | |
563 | ||
564 | int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) | |
565 | { | |
566 | struct ipvl_dev *ipvlan = netdev_priv(dev); | |
0fba37a3 | 567 | struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); |
2ad7bf36 MB |
568 | |
569 | if (!port) | |
570 | goto out; | |
571 | ||
572 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
573 | goto out; | |
574 | ||
575 | switch(port->mode) { | |
576 | case IPVLAN_MODE_L2: | |
577 | return ipvlan_xmit_mode_l2(skb, dev); | |
578 | case IPVLAN_MODE_L3: | |
4fbae7d8 | 579 | case IPVLAN_MODE_L3S: |
2ad7bf36 MB |
580 | return ipvlan_xmit_mode_l3(skb, dev); |
581 | } | |
582 | ||
583 | /* Should not reach here */ | |
584 | WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", | |
585 | port->mode); | |
586 | out: | |
587 | kfree_skb(skb); | |
588 | return NET_XMIT_DROP; | |
589 | } | |
590 | ||
591 | static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) | |
592 | { | |
593 | struct ethhdr *eth = eth_hdr(skb); | |
594 | struct ipvl_addr *addr; | |
595 | void *lyr3h; | |
596 | int addr_type; | |
597 | ||
598 | if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { | |
599 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
600 | if (!lyr3h) | |
601 | return true; | |
602 | ||
603 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); | |
604 | if (addr) | |
605 | return false; | |
606 | } | |
607 | ||
608 | return true; | |
609 | } | |
610 | ||
611 | static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, | |
612 | struct ipvl_port *port) | |
613 | { | |
614 | void *lyr3h; | |
615 | int addr_type; | |
616 | struct ipvl_addr *addr; | |
617 | struct sk_buff *skb = *pskb; | |
618 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
619 | ||
620 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
621 | if (!lyr3h) | |
622 | goto out; | |
623 | ||
624 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
625 | if (addr) | |
cf554ada | 626 | ret = ipvlan_rcv_frame(addr, pskb, false); |
2ad7bf36 MB |
627 | |
628 | out: | |
629 | return ret; | |
630 | } | |
631 | ||
632 | static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, | |
633 | struct ipvl_port *port) | |
634 | { | |
635 | struct sk_buff *skb = *pskb; | |
636 | struct ethhdr *eth = eth_hdr(skb); | |
637 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
638 | void *lyr3h; | |
639 | int addr_type; | |
640 | ||
641 | if (is_multicast_ether_addr(eth->h_dest)) { | |
ba35f858 MB |
642 | if (ipvlan_external_frame(skb, port)) { |
643 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
644 | ||
645 | /* External frames are queued for device local | |
646 | * distribution, but a copy is given to master | |
647 | * straight away to avoid sending duplicates later | |
648 | * when work-queue processes this frame. This is | |
649 | * achieved by returning RX_HANDLER_PASS. | |
650 | */ | |
b93dd49c MB |
651 | if (nskb) { |
652 | ipvlan_skb_crossing_ns(nskb, NULL); | |
e2525360 | 653 | ipvlan_multicast_enqueue(port, nskb, false); |
b93dd49c | 654 | } |
ba35f858 | 655 | } |
2ad7bf36 MB |
656 | } else { |
657 | struct ipvl_addr *addr; | |
658 | ||
659 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
660 | if (!lyr3h) | |
661 | return ret; | |
662 | ||
663 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
664 | if (addr) | |
cf554ada | 665 | ret = ipvlan_rcv_frame(addr, pskb, false); |
2ad7bf36 MB |
666 | } |
667 | ||
668 | return ret; | |
669 | } | |
670 | ||
671 | rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) | |
672 | { | |
673 | struct sk_buff *skb = *pskb; | |
674 | struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); | |
675 | ||
676 | if (!port) | |
677 | return RX_HANDLER_PASS; | |
678 | ||
679 | switch (port->mode) { | |
680 | case IPVLAN_MODE_L2: | |
681 | return ipvlan_handle_mode_l2(pskb, port); | |
682 | case IPVLAN_MODE_L3: | |
683 | return ipvlan_handle_mode_l3(pskb, port); | |
4fbae7d8 MB |
684 | case IPVLAN_MODE_L3S: |
685 | return RX_HANDLER_PASS; | |
2ad7bf36 MB |
686 | } |
687 | ||
688 | /* Should not reach here */ | |
689 | WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", | |
690 | port->mode); | |
691 | kfree_skb(skb); | |
a534dc52 | 692 | return RX_HANDLER_CONSUMED; |
2ad7bf36 | 693 | } |
4fbae7d8 MB |
694 | |
695 | static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb, | |
696 | struct net_device *dev) | |
697 | { | |
698 | struct ipvl_addr *addr = NULL; | |
699 | struct ipvl_port *port; | |
700 | void *lyr3h; | |
701 | int addr_type; | |
702 | ||
703 | if (!dev || !netif_is_ipvlan_port(dev)) | |
704 | goto out; | |
705 | ||
706 | port = ipvlan_port_get_rcu(dev); | |
707 | if (!port || port->mode != IPVLAN_MODE_L3S) | |
708 | goto out; | |
709 | ||
710 | lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); | |
711 | if (!lyr3h) | |
712 | goto out; | |
713 | ||
714 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
715 | out: | |
716 | return addr; | |
717 | } | |
718 | ||
719 | struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb, | |
720 | u16 proto) | |
721 | { | |
722 | struct ipvl_addr *addr; | |
723 | struct net_device *sdev; | |
724 | ||
725 | addr = ipvlan_skb_to_addr(skb, dev); | |
726 | if (!addr) | |
727 | goto out; | |
728 | ||
729 | sdev = addr->master->dev; | |
730 | switch (proto) { | |
731 | case AF_INET: | |
732 | { | |
733 | int err; | |
734 | struct iphdr *ip4h = ip_hdr(skb); | |
735 | ||
736 | err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr, | |
737 | ip4h->tos, sdev); | |
738 | if (unlikely(err)) | |
739 | goto out; | |
740 | break; | |
741 | } | |
742 | case AF_INET6: | |
743 | { | |
744 | struct dst_entry *dst; | |
745 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
746 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
747 | struct flowi6 fl6 = { | |
748 | .flowi6_iif = sdev->ifindex, | |
749 | .daddr = ip6h->daddr, | |
750 | .saddr = ip6h->saddr, | |
751 | .flowlabel = ip6_flowinfo(ip6h), | |
752 | .flowi6_mark = skb->mark, | |
753 | .flowi6_proto = ip6h->nexthdr, | |
754 | }; | |
755 | ||
756 | skb_dst_drop(skb); | |
757 | dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags); | |
758 | skb_dst_set(skb, dst); | |
759 | break; | |
760 | } | |
761 | default: | |
762 | break; | |
763 | } | |
764 | ||
765 | out: | |
766 | return skb; | |
767 | } | |
768 | ||
769 | unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb, | |
770 | const struct nf_hook_state *state) | |
771 | { | |
772 | struct ipvl_addr *addr; | |
773 | unsigned int len; | |
774 | ||
775 | addr = ipvlan_skb_to_addr(skb, skb->dev); | |
776 | if (!addr) | |
777 | goto out; | |
778 | ||
779 | skb->dev = addr->master->dev; | |
780 | len = skb->len + ETH_HLEN; | |
781 | ipvlan_count_rx(addr->master, len, true, false); | |
782 | out: | |
783 | return NF_ACCEPT; | |
784 | } |