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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 | ||
235a9d89 | 19 | void ipvlan_count_rx(const struct ipvl_dev *ipvlan, |
2ad7bf36 MB |
20 | unsigned int len, bool success, bool mcast) |
21 | { | |
2ad7bf36 MB |
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 | } | |
235a9d89 | 36 | EXPORT_SYMBOL_GPL(ipvlan_count_rx); |
2ad7bf36 MB |
37 | |
38 | static u8 ipvlan_get_v6_hash(const void *iaddr) | |
39 | { | |
40 | const struct in6_addr *ip6_addr = iaddr; | |
41 | ||
42 | return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) & | |
43 | IPVLAN_HASH_MASK; | |
44 | } | |
45 | ||
46 | static u8 ipvlan_get_v4_hash(const void *iaddr) | |
47 | { | |
48 | const struct in_addr *ip4_addr = iaddr; | |
49 | ||
50 | return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) & | |
51 | IPVLAN_HASH_MASK; | |
52 | } | |
53 | ||
ab5b7013 MB |
54 | static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, |
55 | const void *iaddr, bool is_v6) | |
2ad7bf36 MB |
56 | { |
57 | struct ipvl_addr *addr; | |
58 | u8 hash; | |
59 | ||
60 | hash = is_v6 ? ipvlan_get_v6_hash(iaddr) : | |
61 | ipvlan_get_v4_hash(iaddr); | |
62 | hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) { | |
63 | if (is_v6 && addr->atype == IPVL_IPV6 && | |
64 | ipv6_addr_equal(&addr->ip6addr, iaddr)) | |
65 | return addr; | |
66 | else if (!is_v6 && addr->atype == IPVL_IPV4 && | |
67 | addr->ip4addr.s_addr == | |
68 | ((struct in_addr *)iaddr)->s_addr) | |
69 | return addr; | |
70 | } | |
71 | return NULL; | |
72 | } | |
73 | ||
74 | void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr) | |
75 | { | |
76 | struct ipvl_port *port = ipvlan->port; | |
77 | u8 hash; | |
78 | ||
79 | hash = (addr->atype == IPVL_IPV6) ? | |
80 | ipvlan_get_v6_hash(&addr->ip6addr) : | |
81 | ipvlan_get_v4_hash(&addr->ip4addr); | |
27705f70 JB |
82 | if (hlist_unhashed(&addr->hlnode)) |
83 | hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); | |
2ad7bf36 MB |
84 | } |
85 | ||
6640e673 | 86 | void ipvlan_ht_addr_del(struct ipvl_addr *addr) |
2ad7bf36 | 87 | { |
27705f70 | 88 | hlist_del_init_rcu(&addr->hlnode); |
2ad7bf36 MB |
89 | } |
90 | ||
e9997c29 JB |
91 | struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, |
92 | const void *iaddr, bool is_v6) | |
2ad7bf36 | 93 | { |
2ad7bf36 MB |
94 | struct ipvl_addr *addr; |
95 | ||
96 | list_for_each_entry(addr, &ipvlan->addrs, anode) { | |
97 | if ((is_v6 && addr->atype == IPVL_IPV6 && | |
98 | ipv6_addr_equal(&addr->ip6addr, iaddr)) || | |
99 | (!is_v6 && addr->atype == IPVL_IPV4 && | |
100 | addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr)) | |
e9997c29 | 101 | return addr; |
2ad7bf36 | 102 | } |
e9997c29 JB |
103 | return NULL; |
104 | } | |
2ad7bf36 | 105 | |
e9997c29 JB |
106 | bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) |
107 | { | |
108 | struct ipvl_dev *ipvlan; | |
2ad7bf36 | 109 | |
e9997c29 | 110 | ASSERT_RTNL(); |
2ad7bf36 | 111 | |
e9997c29 JB |
112 | list_for_each_entry(ipvlan, &port->ipvlans, pnode) { |
113 | if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) | |
114 | return true; | |
115 | } | |
2ad7bf36 MB |
116 | return false; |
117 | } | |
118 | ||
5fc9220a | 119 | static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type) |
2ad7bf36 MB |
120 | { |
121 | void *lyr3h = NULL; | |
122 | ||
123 | switch (skb->protocol) { | |
124 | case htons(ETH_P_ARP): { | |
125 | struct arphdr *arph; | |
126 | ||
5fc9220a | 127 | if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev)))) |
2ad7bf36 MB |
128 | return NULL; |
129 | ||
130 | arph = arp_hdr(skb); | |
131 | *type = IPVL_ARP; | |
132 | lyr3h = arph; | |
133 | break; | |
134 | } | |
135 | case htons(ETH_P_IP): { | |
136 | u32 pktlen; | |
137 | struct iphdr *ip4h; | |
138 | ||
139 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) | |
140 | return NULL; | |
141 | ||
142 | ip4h = ip_hdr(skb); | |
143 | pktlen = ntohs(ip4h->tot_len); | |
144 | if (ip4h->ihl < 5 || ip4h->version != 4) | |
145 | return NULL; | |
146 | if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) | |
147 | return NULL; | |
148 | ||
149 | *type = IPVL_IPV4; | |
150 | lyr3h = ip4h; | |
151 | break; | |
152 | } | |
153 | case htons(ETH_P_IPV6): { | |
154 | struct ipv6hdr *ip6h; | |
155 | ||
156 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) | |
157 | return NULL; | |
158 | ||
159 | ip6h = ipv6_hdr(skb); | |
160 | if (ip6h->version != 6) | |
161 | return NULL; | |
162 | ||
163 | *type = IPVL_IPV6; | |
164 | lyr3h = ip6h; | |
165 | /* Only Neighbour Solicitation pkts need different treatment */ | |
166 | if (ipv6_addr_any(&ip6h->saddr) && | |
167 | ip6h->nexthdr == NEXTHDR_ICMP) { | |
747a7135 GF |
168 | struct icmp6hdr *icmph; |
169 | ||
170 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)))) | |
171 | return NULL; | |
172 | ||
173 | ip6h = ipv6_hdr(skb); | |
174 | icmph = (struct icmp6hdr *)(ip6h + 1); | |
175 | ||
176 | if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { | |
177 | /* Need to access the ipv6 address in body */ | |
178 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph) | |
179 | + sizeof(struct in6_addr)))) | |
180 | return NULL; | |
181 | ||
182 | ip6h = ipv6_hdr(skb); | |
183 | icmph = (struct icmp6hdr *)(ip6h + 1); | |
184 | } | |
185 | ||
2ad7bf36 | 186 | *type = IPVL_ICMPV6; |
747a7135 | 187 | lyr3h = icmph; |
2ad7bf36 MB |
188 | } |
189 | break; | |
190 | } | |
191 | default: | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | return lyr3h; | |
196 | } | |
197 | ||
198 | unsigned int ipvlan_mac_hash(const unsigned char *addr) | |
199 | { | |
200 | u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), | |
201 | ipvlan_jhash_secret); | |
202 | ||
203 | return hash & IPVLAN_MAC_FILTER_MASK; | |
204 | } | |
205 | ||
ba35f858 | 206 | void ipvlan_process_multicast(struct work_struct *work) |
2ad7bf36 | 207 | { |
ba35f858 MB |
208 | struct ipvl_port *port = container_of(work, struct ipvl_port, wq); |
209 | struct ethhdr *ethh; | |
2ad7bf36 | 210 | struct ipvl_dev *ipvlan; |
ba35f858 MB |
211 | struct sk_buff *skb, *nskb; |
212 | struct sk_buff_head list; | |
2ad7bf36 MB |
213 | unsigned int len; |
214 | unsigned int mac_hash; | |
215 | int ret; | |
ba35f858 | 216 | u8 pkt_type; |
e2525360 | 217 | bool tx_pkt; |
2ad7bf36 | 218 | |
ba35f858 | 219 | __skb_queue_head_init(&list); |
2ad7bf36 | 220 | |
ba35f858 MB |
221 | spin_lock_bh(&port->backlog.lock); |
222 | skb_queue_splice_tail_init(&port->backlog, &list); | |
223 | spin_unlock_bh(&port->backlog.lock); | |
2ad7bf36 | 224 | |
ba35f858 | 225 | while ((skb = __skb_dequeue(&list)) != NULL) { |
b1227d01 ED |
226 | struct net_device *dev = skb->dev; |
227 | bool consumed = false; | |
228 | ||
ba35f858 | 229 | ethh = eth_hdr(skb); |
e2525360 | 230 | tx_pkt = IPVL_SKB_CB(skb)->tx_pkt; |
ba35f858 | 231 | mac_hash = ipvlan_mac_hash(ethh->h_dest); |
2ad7bf36 | 232 | |
ba35f858 MB |
233 | if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) |
234 | pkt_type = PACKET_BROADCAST; | |
2ad7bf36 | 235 | else |
ba35f858 MB |
236 | pkt_type = PACKET_MULTICAST; |
237 | ||
ba35f858 MB |
238 | rcu_read_lock(); |
239 | list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { | |
e2525360 | 240 | if (tx_pkt && (ipvlan->dev == skb->dev)) |
ba35f858 | 241 | continue; |
ba35f858 MB |
242 | if (!test_bit(mac_hash, ipvlan->mac_filters)) |
243 | continue; | |
b1227d01 ED |
244 | if (!(ipvlan->dev->flags & IFF_UP)) |
245 | continue; | |
ba35f858 MB |
246 | ret = NET_RX_DROP; |
247 | len = skb->len + ETH_HLEN; | |
248 | nskb = skb_clone(skb, GFP_ATOMIC); | |
b1227d01 ED |
249 | local_bh_disable(); |
250 | if (nskb) { | |
251 | consumed = true; | |
252 | nskb->pkt_type = pkt_type; | |
253 | nskb->dev = ipvlan->dev; | |
e2525360 | 254 | if (tx_pkt) |
b1227d01 ED |
255 | ret = dev_forward_skb(ipvlan->dev, nskb); |
256 | else | |
257 | ret = netif_rx(nskb); | |
258 | } | |
ba35f858 | 259 | ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); |
b1227d01 | 260 | local_bh_enable(); |
ba35f858 MB |
261 | } |
262 | rcu_read_unlock(); | |
263 | ||
e2525360 | 264 | if (tx_pkt) { |
ba35f858 MB |
265 | /* If the packet originated here, send it out. */ |
266 | skb->dev = port->dev; | |
267 | skb->pkt_type = pkt_type; | |
268 | dev_queue_xmit(skb); | |
269 | } else { | |
b1227d01 ED |
270 | if (consumed) |
271 | consume_skb(skb); | |
272 | else | |
273 | kfree_skb(skb); | |
2ad7bf36 | 274 | } |
b1227d01 ED |
275 | if (dev) |
276 | dev_put(dev); | |
2ad7bf36 MB |
277 | } |
278 | } | |
279 | ||
b93dd49c MB |
280 | static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev) |
281 | { | |
282 | bool xnet = true; | |
283 | ||
284 | if (dev) | |
285 | xnet = !net_eq(dev_net(skb->dev), dev_net(dev)); | |
286 | ||
287 | skb_scrub_packet(skb, xnet); | |
288 | if (dev) | |
289 | skb->dev = dev; | |
290 | } | |
291 | ||
cf554ada | 292 | static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, |
2ad7bf36 MB |
293 | bool local) |
294 | { | |
295 | struct ipvl_dev *ipvlan = addr->master; | |
296 | struct net_device *dev = ipvlan->dev; | |
297 | unsigned int len; | |
298 | rx_handler_result_t ret = RX_HANDLER_CONSUMED; | |
299 | bool success = false; | |
cf554ada | 300 | struct sk_buff *skb = *pskb; |
2ad7bf36 MB |
301 | |
302 | len = skb->len + ETH_HLEN; | |
ab5b7013 MB |
303 | /* Only packets exchanged between two local slaves need to have |
304 | * device-up check as well as skb-share check. | |
305 | */ | |
306 | if (local) { | |
307 | if (unlikely(!(dev->flags & IFF_UP))) { | |
308 | kfree_skb(skb); | |
309 | goto out; | |
310 | } | |
2ad7bf36 | 311 | |
ab5b7013 MB |
312 | skb = skb_share_check(skb, GFP_ATOMIC); |
313 | if (!skb) | |
314 | goto out; | |
2ad7bf36 | 315 | |
ab5b7013 MB |
316 | *pskb = skb; |
317 | } | |
b93dd49c | 318 | ipvlan_skb_crossing_ns(skb, dev); |
2ad7bf36 MB |
319 | |
320 | if (local) { | |
ab5b7013 | 321 | skb->pkt_type = PACKET_HOST; |
2ad7bf36 MB |
322 | if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) |
323 | success = true; | |
324 | } else { | |
325 | ret = RX_HANDLER_ANOTHER; | |
326 | success = true; | |
327 | } | |
328 | ||
329 | out: | |
330 | ipvlan_count_rx(ipvlan, len, success, false); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, | |
335 | void *lyr3h, int addr_type, | |
336 | bool use_dest) | |
337 | { | |
338 | struct ipvl_addr *addr = NULL; | |
339 | ||
340 | if (addr_type == IPVL_IPV6) { | |
341 | struct ipv6hdr *ip6h; | |
342 | struct in6_addr *i6addr; | |
343 | ||
344 | ip6h = (struct ipv6hdr *)lyr3h; | |
345 | i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; | |
346 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
347 | } else if (addr_type == IPVL_ICMPV6) { | |
348 | struct nd_msg *ndmh; | |
349 | struct in6_addr *i6addr; | |
350 | ||
351 | /* Make sure that the NeighborSolicitation ICMPv6 packets | |
352 | * are handled to avoid DAD issue. | |
353 | */ | |
354 | ndmh = (struct nd_msg *)lyr3h; | |
355 | if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { | |
356 | i6addr = &ndmh->target; | |
357 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
358 | } | |
359 | } else if (addr_type == IPVL_IPV4) { | |
360 | struct iphdr *ip4h; | |
361 | __be32 *i4addr; | |
362 | ||
363 | ip4h = (struct iphdr *)lyr3h; | |
364 | i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; | |
365 | addr = ipvlan_ht_addr_lookup(port, i4addr, false); | |
366 | } else if (addr_type == IPVL_ARP) { | |
367 | struct arphdr *arph; | |
368 | unsigned char *arp_ptr; | |
369 | __be32 dip; | |
370 | ||
371 | arph = (struct arphdr *)lyr3h; | |
372 | arp_ptr = (unsigned char *)(arph + 1); | |
373 | if (use_dest) | |
374 | arp_ptr += (2 * port->dev->addr_len) + 4; | |
375 | else | |
376 | arp_ptr += port->dev->addr_len; | |
377 | ||
378 | memcpy(&dip, arp_ptr, 4); | |
379 | addr = ipvlan_ht_addr_lookup(port, &dip, false); | |
380 | } | |
381 | ||
382 | return addr; | |
383 | } | |
384 | ||
b93dd49c | 385 | static int ipvlan_process_v4_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
386 | { |
387 | const struct iphdr *ip4h = ip_hdr(skb); | |
388 | struct net_device *dev = skb->dev; | |
57c4bf85 | 389 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
390 | struct rtable *rt; |
391 | int err, ret = NET_XMIT_DROP; | |
392 | struct flowi4 fl4 = { | |
63b11e75 | 393 | .flowi4_oif = dev->ifindex, |
2ad7bf36 MB |
394 | .flowi4_tos = RT_TOS(ip4h->tos), |
395 | .flowi4_flags = FLOWI_FLAG_ANYSRC, | |
a98a4ebc | 396 | .flowi4_mark = skb->mark, |
2ad7bf36 MB |
397 | .daddr = ip4h->daddr, |
398 | .saddr = ip4h->saddr, | |
399 | }; | |
400 | ||
57c4bf85 | 401 | rt = ip_route_output_flow(net, &fl4, NULL); |
2ad7bf36 MB |
402 | if (IS_ERR(rt)) |
403 | goto err; | |
404 | ||
405 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
406 | ip_rt_put(rt); | |
407 | goto err; | |
408 | } | |
2ad7bf36 | 409 | skb_dst_set(skb, &rt->dst); |
33224b16 | 410 | err = ip_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
411 | if (unlikely(net_xmit_eval(err))) |
412 | dev->stats.tx_errors++; | |
413 | else | |
414 | ret = NET_XMIT_SUCCESS; | |
415 | goto out; | |
416 | err: | |
417 | dev->stats.tx_errors++; | |
418 | kfree_skb(skb); | |
419 | out: | |
420 | return ret; | |
421 | } | |
422 | ||
b93dd49c | 423 | static int ipvlan_process_v6_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
424 | { |
425 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
426 | struct net_device *dev = skb->dev; | |
57c4bf85 | 427 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
428 | struct dst_entry *dst; |
429 | int err, ret = NET_XMIT_DROP; | |
430 | struct flowi6 fl6 = { | |
ca29fd7c | 431 | .flowi6_oif = dev->ifindex, |
2ad7bf36 MB |
432 | .daddr = ip6h->daddr, |
433 | .saddr = ip6h->saddr, | |
434 | .flowi6_flags = FLOWI_FLAG_ANYSRC, | |
435 | .flowlabel = ip6_flowinfo(ip6h), | |
436 | .flowi6_mark = skb->mark, | |
437 | .flowi6_proto = ip6h->nexthdr, | |
438 | }; | |
439 | ||
57c4bf85 | 440 | dst = ip6_route_output(net, NULL, &fl6); |
2aab9525 MB |
441 | if (dst->error) { |
442 | ret = dst->error; | |
443 | dst_release(dst); | |
2ad7bf36 | 444 | goto err; |
2aab9525 | 445 | } |
2ad7bf36 | 446 | skb_dst_set(skb, dst); |
33224b16 | 447 | err = ip6_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
448 | if (unlikely(net_xmit_eval(err))) |
449 | dev->stats.tx_errors++; | |
450 | else | |
451 | ret = NET_XMIT_SUCCESS; | |
452 | goto out; | |
453 | err: | |
454 | dev->stats.tx_errors++; | |
455 | kfree_skb(skb); | |
456 | out: | |
457 | return ret; | |
458 | } | |
459 | ||
b93dd49c | 460 | static int ipvlan_process_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
461 | { |
462 | struct ethhdr *ethh = eth_hdr(skb); | |
463 | int ret = NET_XMIT_DROP; | |
464 | ||
465 | /* In this mode we dont care about multicast and broadcast traffic */ | |
466 | if (is_multicast_ether_addr(ethh->h_dest)) { | |
467 | pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n", | |
468 | ntohs(skb->protocol)); | |
469 | kfree_skb(skb); | |
470 | goto out; | |
471 | } | |
472 | ||
473 | /* The ipvlan is a pseudo-L2 device, so the packets that we receive | |
474 | * will have L2; which need to discarded and processed further | |
475 | * in the net-ns of the main-device. | |
476 | */ | |
477 | if (skb_mac_header_was_set(skb)) { | |
478 | skb_pull(skb, sizeof(*ethh)); | |
479 | skb->mac_header = (typeof(skb->mac_header))~0U; | |
480 | skb_reset_network_header(skb); | |
481 | } | |
482 | ||
483 | if (skb->protocol == htons(ETH_P_IPV6)) | |
b93dd49c | 484 | ret = ipvlan_process_v6_outbound(skb); |
2ad7bf36 | 485 | else if (skb->protocol == htons(ETH_P_IP)) |
b93dd49c | 486 | ret = ipvlan_process_v4_outbound(skb); |
2ad7bf36 MB |
487 | else { |
488 | pr_warn_ratelimited("Dropped outbound packet type=%x\n", | |
489 | ntohs(skb->protocol)); | |
490 | kfree_skb(skb); | |
491 | } | |
492 | out: | |
493 | return ret; | |
494 | } | |
495 | ||
ba35f858 | 496 | static void ipvlan_multicast_enqueue(struct ipvl_port *port, |
e2525360 | 497 | struct sk_buff *skb, bool tx_pkt) |
ba35f858 MB |
498 | { |
499 | if (skb->protocol == htons(ETH_P_PAUSE)) { | |
500 | kfree_skb(skb); | |
501 | return; | |
502 | } | |
503 | ||
e2525360 MB |
504 | /* Record that the deferred packet is from TX or RX path. By |
505 | * looking at mac-addresses on packet will lead to erronus decisions. | |
506 | * (This would be true for a loopback-mode on master device or a | |
507 | * hair-pin mode of the switch.) | |
508 | */ | |
509 | IPVL_SKB_CB(skb)->tx_pkt = tx_pkt; | |
510 | ||
ba35f858 MB |
511 | spin_lock(&port->backlog.lock); |
512 | if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { | |
b1227d01 ED |
513 | if (skb->dev) |
514 | dev_hold(skb->dev); | |
ba35f858 MB |
515 | __skb_queue_tail(&port->backlog, skb); |
516 | spin_unlock(&port->backlog.lock); | |
517 | schedule_work(&port->wq); | |
518 | } else { | |
519 | spin_unlock(&port->backlog.lock); | |
520 | atomic_long_inc(&skb->dev->rx_dropped); | |
521 | kfree_skb(skb); | |
522 | } | |
523 | } | |
524 | ||
2ad7bf36 MB |
525 | static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) |
526 | { | |
527 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
528 | void *lyr3h; | |
529 | struct ipvl_addr *addr; | |
530 | int addr_type; | |
531 | ||
5fc9220a | 532 | lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); |
2ad7bf36 MB |
533 | if (!lyr3h) |
534 | goto out; | |
535 | ||
fe89aa6b MB |
536 | if (!ipvlan_is_vepa(ipvlan->port)) { |
537 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
538 | if (addr) { | |
539 | if (ipvlan_is_private(ipvlan->port)) { | |
540 | consume_skb(skb); | |
541 | return NET_XMIT_DROP; | |
542 | } | |
543 | return ipvlan_rcv_frame(addr, &skb, true); | |
a190d04d | 544 | } |
a190d04d | 545 | } |
2ad7bf36 | 546 | out: |
b93dd49c MB |
547 | ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); |
548 | return ipvlan_process_outbound(skb); | |
2ad7bf36 MB |
549 | } |
550 | ||
551 | static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) | |
552 | { | |
553 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
554 | struct ethhdr *eth = eth_hdr(skb); | |
555 | struct ipvl_addr *addr; | |
556 | void *lyr3h; | |
557 | int addr_type; | |
558 | ||
fe89aa6b MB |
559 | if (!ipvlan_is_vepa(ipvlan->port) && |
560 | ether_addr_equal(eth->h_dest, eth->h_source)) { | |
5fc9220a | 561 | lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); |
2ad7bf36 MB |
562 | if (lyr3h) { |
563 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
a190d04d MB |
564 | if (addr) { |
565 | if (ipvlan_is_private(ipvlan->port)) { | |
566 | consume_skb(skb); | |
567 | return NET_XMIT_DROP; | |
568 | } | |
cf554ada | 569 | return ipvlan_rcv_frame(addr, &skb, true); |
a190d04d | 570 | } |
2ad7bf36 MB |
571 | } |
572 | skb = skb_share_check(skb, GFP_ATOMIC); | |
573 | if (!skb) | |
574 | return NET_XMIT_DROP; | |
575 | ||
576 | /* Packet definitely does not belong to any of the | |
577 | * virtual devices, but the dest is local. So forward | |
578 | * the skb for the main-dev. At the RX side we just return | |
579 | * RX_PASS for it to be processed further on the stack. | |
580 | */ | |
581 | return dev_forward_skb(ipvlan->phy_dev, skb); | |
582 | ||
583 | } else if (is_multicast_ether_addr(eth->h_dest)) { | |
b93dd49c | 584 | ipvlan_skb_crossing_ns(skb, NULL); |
e2525360 | 585 | ipvlan_multicast_enqueue(ipvlan->port, skb, true); |
ba35f858 | 586 | return NET_XMIT_SUCCESS; |
2ad7bf36 MB |
587 | } |
588 | ||
b93dd49c | 589 | ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); |
2ad7bf36 MB |
590 | return dev_queue_xmit(skb); |
591 | } | |
592 | ||
593 | int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) | |
594 | { | |
595 | struct ipvl_dev *ipvlan = netdev_priv(dev); | |
0fba37a3 | 596 | struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); |
2ad7bf36 MB |
597 | |
598 | if (!port) | |
599 | goto out; | |
600 | ||
601 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
602 | goto out; | |
603 | ||
604 | switch(port->mode) { | |
605 | case IPVLAN_MODE_L2: | |
606 | return ipvlan_xmit_mode_l2(skb, dev); | |
607 | case IPVLAN_MODE_L3: | |
4fbae7d8 | 608 | case IPVLAN_MODE_L3S: |
2ad7bf36 MB |
609 | return ipvlan_xmit_mode_l3(skb, dev); |
610 | } | |
611 | ||
612 | /* Should not reach here */ | |
613 | WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", | |
614 | port->mode); | |
615 | out: | |
616 | kfree_skb(skb); | |
617 | return NET_XMIT_DROP; | |
618 | } | |
619 | ||
620 | static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) | |
621 | { | |
622 | struct ethhdr *eth = eth_hdr(skb); | |
623 | struct ipvl_addr *addr; | |
624 | void *lyr3h; | |
625 | int addr_type; | |
626 | ||
627 | if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { | |
5fc9220a | 628 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
2ad7bf36 MB |
629 | if (!lyr3h) |
630 | return true; | |
631 | ||
632 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); | |
633 | if (addr) | |
634 | return false; | |
635 | } | |
636 | ||
637 | return true; | |
638 | } | |
639 | ||
640 | static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, | |
641 | struct ipvl_port *port) | |
642 | { | |
643 | void *lyr3h; | |
644 | int addr_type; | |
645 | struct ipvl_addr *addr; | |
646 | struct sk_buff *skb = *pskb; | |
647 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
648 | ||
5fc9220a | 649 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
2ad7bf36 MB |
650 | if (!lyr3h) |
651 | goto out; | |
652 | ||
653 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
654 | if (addr) | |
cf554ada | 655 | ret = ipvlan_rcv_frame(addr, pskb, false); |
2ad7bf36 MB |
656 | |
657 | out: | |
658 | return ret; | |
659 | } | |
660 | ||
661 | static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, | |
662 | struct ipvl_port *port) | |
663 | { | |
664 | struct sk_buff *skb = *pskb; | |
665 | struct ethhdr *eth = eth_hdr(skb); | |
666 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
667 | void *lyr3h; | |
668 | int addr_type; | |
669 | ||
670 | if (is_multicast_ether_addr(eth->h_dest)) { | |
ba35f858 MB |
671 | if (ipvlan_external_frame(skb, port)) { |
672 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
673 | ||
674 | /* External frames are queued for device local | |
675 | * distribution, but a copy is given to master | |
676 | * straight away to avoid sending duplicates later | |
677 | * when work-queue processes this frame. This is | |
678 | * achieved by returning RX_HANDLER_PASS. | |
679 | */ | |
b93dd49c MB |
680 | if (nskb) { |
681 | ipvlan_skb_crossing_ns(nskb, NULL); | |
e2525360 | 682 | ipvlan_multicast_enqueue(port, nskb, false); |
b93dd49c | 683 | } |
ba35f858 | 684 | } |
2ad7bf36 MB |
685 | } else { |
686 | struct ipvl_addr *addr; | |
687 | ||
5fc9220a | 688 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
2ad7bf36 MB |
689 | if (!lyr3h) |
690 | return ret; | |
691 | ||
692 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
693 | if (addr) | |
cf554ada | 694 | ret = ipvlan_rcv_frame(addr, pskb, false); |
2ad7bf36 MB |
695 | } |
696 | ||
697 | return ret; | |
698 | } | |
699 | ||
700 | rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) | |
701 | { | |
702 | struct sk_buff *skb = *pskb; | |
703 | struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); | |
704 | ||
705 | if (!port) | |
706 | return RX_HANDLER_PASS; | |
707 | ||
708 | switch (port->mode) { | |
709 | case IPVLAN_MODE_L2: | |
710 | return ipvlan_handle_mode_l2(pskb, port); | |
711 | case IPVLAN_MODE_L3: | |
712 | return ipvlan_handle_mode_l3(pskb, port); | |
4fbae7d8 MB |
713 | case IPVLAN_MODE_L3S: |
714 | return RX_HANDLER_PASS; | |
2ad7bf36 MB |
715 | } |
716 | ||
717 | /* Should not reach here */ | |
718 | WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", | |
719 | port->mode); | |
720 | kfree_skb(skb); | |
a534dc52 | 721 | return RX_HANDLER_CONSUMED; |
2ad7bf36 | 722 | } |
4fbae7d8 MB |
723 | |
724 | static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb, | |
725 | struct net_device *dev) | |
726 | { | |
727 | struct ipvl_addr *addr = NULL; | |
728 | struct ipvl_port *port; | |
729 | void *lyr3h; | |
730 | int addr_type; | |
731 | ||
732 | if (!dev || !netif_is_ipvlan_port(dev)) | |
733 | goto out; | |
734 | ||
735 | port = ipvlan_port_get_rcu(dev); | |
736 | if (!port || port->mode != IPVLAN_MODE_L3S) | |
737 | goto out; | |
738 | ||
5fc9220a | 739 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
4fbae7d8 MB |
740 | if (!lyr3h) |
741 | goto out; | |
742 | ||
743 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
744 | out: | |
745 | return addr; | |
746 | } | |
747 | ||
748 | struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb, | |
749 | u16 proto) | |
750 | { | |
751 | struct ipvl_addr *addr; | |
752 | struct net_device *sdev; | |
753 | ||
754 | addr = ipvlan_skb_to_addr(skb, dev); | |
755 | if (!addr) | |
756 | goto out; | |
757 | ||
758 | sdev = addr->master->dev; | |
759 | switch (proto) { | |
760 | case AF_INET: | |
761 | { | |
762 | int err; | |
763 | struct iphdr *ip4h = ip_hdr(skb); | |
764 | ||
765 | err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr, | |
766 | ip4h->tos, sdev); | |
767 | if (unlikely(err)) | |
768 | goto out; | |
769 | break; | |
770 | } | |
771 | case AF_INET6: | |
772 | { | |
773 | struct dst_entry *dst; | |
774 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
775 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
776 | struct flowi6 fl6 = { | |
777 | .flowi6_iif = sdev->ifindex, | |
778 | .daddr = ip6h->daddr, | |
779 | .saddr = ip6h->saddr, | |
780 | .flowlabel = ip6_flowinfo(ip6h), | |
781 | .flowi6_mark = skb->mark, | |
782 | .flowi6_proto = ip6h->nexthdr, | |
783 | }; | |
784 | ||
785 | skb_dst_drop(skb); | |
786 | dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags); | |
787 | skb_dst_set(skb, dst); | |
788 | break; | |
789 | } | |
790 | default: | |
791 | break; | |
792 | } | |
793 | ||
794 | out: | |
795 | return skb; | |
796 | } | |
797 | ||
798 | unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb, | |
799 | const struct nf_hook_state *state) | |
800 | { | |
801 | struct ipvl_addr *addr; | |
802 | unsigned int len; | |
803 | ||
804 | addr = ipvlan_skb_to_addr(skb, skb->dev); | |
805 | if (!addr) | |
806 | goto out; | |
807 | ||
808 | skb->dev = addr->master->dev; | |
809 | len = skb->len + ETH_HLEN; | |
810 | ipvlan_count_rx(addr->master, len, true, false); | |
811 | out: | |
812 | return NF_ACCEPT; | |
813 | } |