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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 | 37 | |
94333fac | 38 | #if IS_ENABLED(CONFIG_IPV6) |
2ad7bf36 MB |
39 | static 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 | } | |
94333fac MC |
46 | #else |
47 | static u8 ipvlan_get_v6_hash(const void *iaddr) | |
48 | { | |
49 | return 0; | |
50 | } | |
51 | #endif | |
2ad7bf36 MB |
52 | |
53 | static 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 | ||
94333fac MC |
61 | static 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 | ||
ab5b7013 MB |
78 | static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, |
79 | const void *iaddr, bool is_v6) | |
2ad7bf36 MB |
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); | |
94333fac MC |
86 | hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) |
87 | if (addr_equal(is_v6, addr, iaddr)) | |
2ad7bf36 | 88 | return addr; |
2ad7bf36 MB |
89 | return NULL; |
90 | } | |
91 | ||
92 | void 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); | |
27705f70 JB |
100 | if (hlist_unhashed(&addr->hlnode)) |
101 | hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); | |
2ad7bf36 MB |
102 | } |
103 | ||
6640e673 | 104 | void ipvlan_ht_addr_del(struct ipvl_addr *addr) |
2ad7bf36 | 105 | { |
27705f70 | 106 | hlist_del_init_rcu(&addr->hlnode); |
2ad7bf36 MB |
107 | } |
108 | ||
e9997c29 JB |
109 | struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, |
110 | const void *iaddr, bool is_v6) | |
2ad7bf36 | 111 | { |
2ad7bf36 MB |
112 | struct ipvl_addr *addr; |
113 | ||
94333fac MC |
114 | list_for_each_entry(addr, &ipvlan->addrs, anode) |
115 | if (addr_equal(is_v6, addr, iaddr)) | |
e9997c29 | 116 | return addr; |
e9997c29 JB |
117 | return NULL; |
118 | } | |
2ad7bf36 | 119 | |
e9997c29 JB |
120 | bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) |
121 | { | |
122 | struct ipvl_dev *ipvlan; | |
2ad7bf36 | 123 | |
e9997c29 | 124 | ASSERT_RTNL(); |
2ad7bf36 | 125 | |
e9997c29 JB |
126 | list_for_each_entry(ipvlan, &port->ipvlans, pnode) { |
127 | if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) | |
128 | return true; | |
129 | } | |
2ad7bf36 MB |
130 | return false; |
131 | } | |
132 | ||
5fc9220a | 133 | static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type) |
2ad7bf36 MB |
134 | { |
135 | void *lyr3h = NULL; | |
136 | ||
137 | switch (skb->protocol) { | |
138 | case htons(ETH_P_ARP): { | |
139 | struct arphdr *arph; | |
140 | ||
5fc9220a | 141 | if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev)))) |
2ad7bf36 MB |
142 | return NULL; |
143 | ||
144 | arph = arp_hdr(skb); | |
145 | *type = IPVL_ARP; | |
146 | lyr3h = arph; | |
147 | break; | |
148 | } | |
149 | case htons(ETH_P_IP): { | |
150 | u32 pktlen; | |
151 | struct iphdr *ip4h; | |
152 | ||
153 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) | |
154 | return NULL; | |
155 | ||
156 | ip4h = ip_hdr(skb); | |
157 | pktlen = ntohs(ip4h->tot_len); | |
158 | if (ip4h->ihl < 5 || ip4h->version != 4) | |
159 | return NULL; | |
160 | if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) | |
161 | return NULL; | |
162 | ||
163 | *type = IPVL_IPV4; | |
164 | lyr3h = ip4h; | |
165 | break; | |
166 | } | |
94333fac | 167 | #if IS_ENABLED(CONFIG_IPV6) |
2ad7bf36 MB |
168 | case htons(ETH_P_IPV6): { |
169 | struct ipv6hdr *ip6h; | |
170 | ||
171 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) | |
172 | return NULL; | |
173 | ||
174 | ip6h = ipv6_hdr(skb); | |
175 | if (ip6h->version != 6) | |
176 | return NULL; | |
177 | ||
178 | *type = IPVL_IPV6; | |
179 | lyr3h = ip6h; | |
180 | /* Only Neighbour Solicitation pkts need different treatment */ | |
181 | if (ipv6_addr_any(&ip6h->saddr) && | |
182 | ip6h->nexthdr == NEXTHDR_ICMP) { | |
747a7135 GF |
183 | struct icmp6hdr *icmph; |
184 | ||
185 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)))) | |
186 | return NULL; | |
187 | ||
188 | ip6h = ipv6_hdr(skb); | |
189 | icmph = (struct icmp6hdr *)(ip6h + 1); | |
190 | ||
191 | if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { | |
192 | /* Need to access the ipv6 address in body */ | |
193 | if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph) | |
194 | + sizeof(struct in6_addr)))) | |
195 | return NULL; | |
196 | ||
197 | ip6h = ipv6_hdr(skb); | |
198 | icmph = (struct icmp6hdr *)(ip6h + 1); | |
199 | } | |
200 | ||
2ad7bf36 | 201 | *type = IPVL_ICMPV6; |
747a7135 | 202 | lyr3h = icmph; |
2ad7bf36 MB |
203 | } |
204 | break; | |
205 | } | |
94333fac | 206 | #endif |
2ad7bf36 MB |
207 | default: |
208 | return NULL; | |
209 | } | |
210 | ||
211 | return lyr3h; | |
212 | } | |
213 | ||
214 | unsigned int ipvlan_mac_hash(const unsigned char *addr) | |
215 | { | |
216 | u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), | |
217 | ipvlan_jhash_secret); | |
218 | ||
219 | return hash & IPVLAN_MAC_FILTER_MASK; | |
220 | } | |
221 | ||
ba35f858 | 222 | void ipvlan_process_multicast(struct work_struct *work) |
2ad7bf36 | 223 | { |
ba35f858 MB |
224 | struct ipvl_port *port = container_of(work, struct ipvl_port, wq); |
225 | struct ethhdr *ethh; | |
2ad7bf36 | 226 | struct ipvl_dev *ipvlan; |
ba35f858 MB |
227 | struct sk_buff *skb, *nskb; |
228 | struct sk_buff_head list; | |
2ad7bf36 MB |
229 | unsigned int len; |
230 | unsigned int mac_hash; | |
231 | int ret; | |
ba35f858 | 232 | u8 pkt_type; |
e2525360 | 233 | bool tx_pkt; |
2ad7bf36 | 234 | |
ba35f858 | 235 | __skb_queue_head_init(&list); |
2ad7bf36 | 236 | |
ba35f858 MB |
237 | spin_lock_bh(&port->backlog.lock); |
238 | skb_queue_splice_tail_init(&port->backlog, &list); | |
239 | spin_unlock_bh(&port->backlog.lock); | |
2ad7bf36 | 240 | |
ba35f858 | 241 | while ((skb = __skb_dequeue(&list)) != NULL) { |
b1227d01 ED |
242 | struct net_device *dev = skb->dev; |
243 | bool consumed = false; | |
244 | ||
ba35f858 | 245 | ethh = eth_hdr(skb); |
e2525360 | 246 | tx_pkt = IPVL_SKB_CB(skb)->tx_pkt; |
ba35f858 | 247 | mac_hash = ipvlan_mac_hash(ethh->h_dest); |
2ad7bf36 | 248 | |
ba35f858 MB |
249 | if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) |
250 | pkt_type = PACKET_BROADCAST; | |
2ad7bf36 | 251 | else |
ba35f858 MB |
252 | pkt_type = PACKET_MULTICAST; |
253 | ||
ba35f858 MB |
254 | rcu_read_lock(); |
255 | list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { | |
e2525360 | 256 | if (tx_pkt && (ipvlan->dev == skb->dev)) |
ba35f858 | 257 | continue; |
ba35f858 MB |
258 | if (!test_bit(mac_hash, ipvlan->mac_filters)) |
259 | continue; | |
b1227d01 ED |
260 | if (!(ipvlan->dev->flags & IFF_UP)) |
261 | continue; | |
ba35f858 MB |
262 | ret = NET_RX_DROP; |
263 | len = skb->len + ETH_HLEN; | |
264 | nskb = skb_clone(skb, GFP_ATOMIC); | |
b1227d01 ED |
265 | local_bh_disable(); |
266 | if (nskb) { | |
267 | consumed = true; | |
268 | nskb->pkt_type = pkt_type; | |
269 | nskb->dev = ipvlan->dev; | |
e2525360 | 270 | if (tx_pkt) |
b1227d01 ED |
271 | ret = dev_forward_skb(ipvlan->dev, nskb); |
272 | else | |
273 | ret = netif_rx(nskb); | |
274 | } | |
ba35f858 | 275 | ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); |
b1227d01 | 276 | local_bh_enable(); |
ba35f858 MB |
277 | } |
278 | rcu_read_unlock(); | |
279 | ||
e2525360 | 280 | if (tx_pkt) { |
ba35f858 MB |
281 | /* If the packet originated here, send it out. */ |
282 | skb->dev = port->dev; | |
283 | skb->pkt_type = pkt_type; | |
284 | dev_queue_xmit(skb); | |
285 | } else { | |
b1227d01 ED |
286 | if (consumed) |
287 | consume_skb(skb); | |
288 | else | |
289 | kfree_skb(skb); | |
2ad7bf36 | 290 | } |
b1227d01 ED |
291 | if (dev) |
292 | dev_put(dev); | |
2ad7bf36 MB |
293 | } |
294 | } | |
295 | ||
b93dd49c MB |
296 | static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev) |
297 | { | |
298 | bool xnet = true; | |
299 | ||
300 | if (dev) | |
301 | xnet = !net_eq(dev_net(skb->dev), dev_net(dev)); | |
302 | ||
303 | skb_scrub_packet(skb, xnet); | |
304 | if (dev) | |
305 | skb->dev = dev; | |
306 | } | |
307 | ||
cf554ada | 308 | static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, |
2ad7bf36 MB |
309 | bool local) |
310 | { | |
311 | struct ipvl_dev *ipvlan = addr->master; | |
312 | struct net_device *dev = ipvlan->dev; | |
313 | unsigned int len; | |
314 | rx_handler_result_t ret = RX_HANDLER_CONSUMED; | |
315 | bool success = false; | |
cf554ada | 316 | struct sk_buff *skb = *pskb; |
2ad7bf36 MB |
317 | |
318 | len = skb->len + ETH_HLEN; | |
ab5b7013 MB |
319 | /* Only packets exchanged between two local slaves need to have |
320 | * device-up check as well as skb-share check. | |
321 | */ | |
322 | if (local) { | |
323 | if (unlikely(!(dev->flags & IFF_UP))) { | |
324 | kfree_skb(skb); | |
325 | goto out; | |
326 | } | |
2ad7bf36 | 327 | |
ab5b7013 MB |
328 | skb = skb_share_check(skb, GFP_ATOMIC); |
329 | if (!skb) | |
330 | goto out; | |
2ad7bf36 | 331 | |
ab5b7013 MB |
332 | *pskb = skb; |
333 | } | |
2ad7bf36 MB |
334 | |
335 | if (local) { | |
ab5b7013 | 336 | skb->pkt_type = PACKET_HOST; |
2ad7bf36 MB |
337 | if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) |
338 | success = true; | |
339 | } else { | |
c0d451c8 | 340 | skb->dev = dev; |
2ad7bf36 MB |
341 | ret = RX_HANDLER_ANOTHER; |
342 | success = true; | |
343 | } | |
344 | ||
345 | out: | |
346 | ipvlan_count_rx(ipvlan, len, success, false); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, | |
351 | void *lyr3h, int addr_type, | |
352 | bool use_dest) | |
353 | { | |
354 | struct ipvl_addr *addr = NULL; | |
355 | ||
94333fac MC |
356 | switch (addr_type) { |
357 | #if IS_ENABLED(CONFIG_IPV6) | |
358 | case IPVL_IPV6: { | |
2ad7bf36 MB |
359 | struct ipv6hdr *ip6h; |
360 | struct in6_addr *i6addr; | |
361 | ||
362 | ip6h = (struct ipv6hdr *)lyr3h; | |
363 | i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; | |
364 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
94333fac MC |
365 | break; |
366 | } | |
367 | case IPVL_ICMPV6: { | |
2ad7bf36 MB |
368 | struct nd_msg *ndmh; |
369 | struct in6_addr *i6addr; | |
370 | ||
371 | /* Make sure that the NeighborSolicitation ICMPv6 packets | |
372 | * are handled to avoid DAD issue. | |
373 | */ | |
374 | ndmh = (struct nd_msg *)lyr3h; | |
375 | if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { | |
376 | i6addr = &ndmh->target; | |
377 | addr = ipvlan_ht_addr_lookup(port, i6addr, true); | |
378 | } | |
94333fac MC |
379 | break; |
380 | } | |
381 | #endif | |
382 | case IPVL_IPV4: { | |
2ad7bf36 MB |
383 | struct iphdr *ip4h; |
384 | __be32 *i4addr; | |
385 | ||
386 | ip4h = (struct iphdr *)lyr3h; | |
387 | i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; | |
388 | addr = ipvlan_ht_addr_lookup(port, i4addr, false); | |
94333fac MC |
389 | break; |
390 | } | |
391 | case IPVL_ARP: { | |
2ad7bf36 MB |
392 | struct arphdr *arph; |
393 | unsigned char *arp_ptr; | |
394 | __be32 dip; | |
395 | ||
396 | arph = (struct arphdr *)lyr3h; | |
397 | arp_ptr = (unsigned char *)(arph + 1); | |
398 | if (use_dest) | |
399 | arp_ptr += (2 * port->dev->addr_len) + 4; | |
400 | else | |
401 | arp_ptr += port->dev->addr_len; | |
402 | ||
403 | memcpy(&dip, arp_ptr, 4); | |
404 | addr = ipvlan_ht_addr_lookup(port, &dip, false); | |
94333fac MC |
405 | break; |
406 | } | |
2ad7bf36 MB |
407 | } |
408 | ||
409 | return addr; | |
410 | } | |
411 | ||
b93dd49c | 412 | static int ipvlan_process_v4_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
413 | { |
414 | const struct iphdr *ip4h = ip_hdr(skb); | |
415 | struct net_device *dev = skb->dev; | |
57c4bf85 | 416 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
417 | struct rtable *rt; |
418 | int err, ret = NET_XMIT_DROP; | |
419 | struct flowi4 fl4 = { | |
63b11e75 | 420 | .flowi4_oif = dev->ifindex, |
2ad7bf36 MB |
421 | .flowi4_tos = RT_TOS(ip4h->tos), |
422 | .flowi4_flags = FLOWI_FLAG_ANYSRC, | |
a98a4ebc | 423 | .flowi4_mark = skb->mark, |
2ad7bf36 MB |
424 | .daddr = ip4h->daddr, |
425 | .saddr = ip4h->saddr, | |
426 | }; | |
427 | ||
57c4bf85 | 428 | rt = ip_route_output_flow(net, &fl4, NULL); |
2ad7bf36 MB |
429 | if (IS_ERR(rt)) |
430 | goto err; | |
431 | ||
432 | if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { | |
433 | ip_rt_put(rt); | |
434 | goto err; | |
435 | } | |
2ad7bf36 | 436 | skb_dst_set(skb, &rt->dst); |
33224b16 | 437 | err = ip_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
438 | if (unlikely(net_xmit_eval(err))) |
439 | dev->stats.tx_errors++; | |
440 | else | |
441 | ret = NET_XMIT_SUCCESS; | |
442 | goto out; | |
443 | err: | |
444 | dev->stats.tx_errors++; | |
445 | kfree_skb(skb); | |
446 | out: | |
447 | return ret; | |
448 | } | |
449 | ||
94333fac | 450 | #if IS_ENABLED(CONFIG_IPV6) |
b93dd49c | 451 | static int ipvlan_process_v6_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
452 | { |
453 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
454 | struct net_device *dev = skb->dev; | |
57c4bf85 | 455 | struct net *net = dev_net(dev); |
2ad7bf36 MB |
456 | struct dst_entry *dst; |
457 | int err, ret = NET_XMIT_DROP; | |
458 | struct flowi6 fl6 = { | |
ca29fd7c | 459 | .flowi6_oif = dev->ifindex, |
2ad7bf36 MB |
460 | .daddr = ip6h->daddr, |
461 | .saddr = ip6h->saddr, | |
462 | .flowi6_flags = FLOWI_FLAG_ANYSRC, | |
463 | .flowlabel = ip6_flowinfo(ip6h), | |
464 | .flowi6_mark = skb->mark, | |
465 | .flowi6_proto = ip6h->nexthdr, | |
466 | }; | |
467 | ||
57c4bf85 | 468 | dst = ip6_route_output(net, NULL, &fl6); |
2aab9525 MB |
469 | if (dst->error) { |
470 | ret = dst->error; | |
471 | dst_release(dst); | |
2ad7bf36 | 472 | goto err; |
2aab9525 | 473 | } |
2ad7bf36 | 474 | skb_dst_set(skb, dst); |
33224b16 | 475 | err = ip6_local_out(net, skb->sk, skb); |
2ad7bf36 MB |
476 | if (unlikely(net_xmit_eval(err))) |
477 | dev->stats.tx_errors++; | |
478 | else | |
479 | ret = NET_XMIT_SUCCESS; | |
480 | goto out; | |
481 | err: | |
482 | dev->stats.tx_errors++; | |
483 | kfree_skb(skb); | |
484 | out: | |
485 | return ret; | |
486 | } | |
94333fac MC |
487 | #else |
488 | static int ipvlan_process_v6_outbound(struct sk_buff *skb) | |
489 | { | |
490 | return NET_XMIT_DROP; | |
491 | } | |
492 | #endif | |
2ad7bf36 | 493 | |
b93dd49c | 494 | static int ipvlan_process_outbound(struct sk_buff *skb) |
2ad7bf36 MB |
495 | { |
496 | struct ethhdr *ethh = eth_hdr(skb); | |
497 | int ret = NET_XMIT_DROP; | |
498 | ||
499 | /* In this mode we dont care about multicast and broadcast traffic */ | |
500 | if (is_multicast_ether_addr(ethh->h_dest)) { | |
cccc200f PA |
501 | pr_debug_ratelimited("Dropped {multi|broad}cast of type=[%x]\n", |
502 | ntohs(skb->protocol)); | |
2ad7bf36 MB |
503 | kfree_skb(skb); |
504 | goto out; | |
505 | } | |
506 | ||
507 | /* The ipvlan is a pseudo-L2 device, so the packets that we receive | |
508 | * will have L2; which need to discarded and processed further | |
509 | * in the net-ns of the main-device. | |
510 | */ | |
511 | if (skb_mac_header_was_set(skb)) { | |
512 | skb_pull(skb, sizeof(*ethh)); | |
513 | skb->mac_header = (typeof(skb->mac_header))~0U; | |
514 | skb_reset_network_header(skb); | |
515 | } | |
516 | ||
517 | if (skb->protocol == htons(ETH_P_IPV6)) | |
b93dd49c | 518 | ret = ipvlan_process_v6_outbound(skb); |
2ad7bf36 | 519 | else if (skb->protocol == htons(ETH_P_IP)) |
b93dd49c | 520 | ret = ipvlan_process_v4_outbound(skb); |
2ad7bf36 MB |
521 | else { |
522 | pr_warn_ratelimited("Dropped outbound packet type=%x\n", | |
523 | ntohs(skb->protocol)); | |
524 | kfree_skb(skb); | |
525 | } | |
526 | out: | |
527 | return ret; | |
528 | } | |
529 | ||
ba35f858 | 530 | static void ipvlan_multicast_enqueue(struct ipvl_port *port, |
e2525360 | 531 | struct sk_buff *skb, bool tx_pkt) |
ba35f858 MB |
532 | { |
533 | if (skb->protocol == htons(ETH_P_PAUSE)) { | |
534 | kfree_skb(skb); | |
535 | return; | |
536 | } | |
537 | ||
e2525360 MB |
538 | /* Record that the deferred packet is from TX or RX path. By |
539 | * looking at mac-addresses on packet will lead to erronus decisions. | |
540 | * (This would be true for a loopback-mode on master device or a | |
541 | * hair-pin mode of the switch.) | |
542 | */ | |
543 | IPVL_SKB_CB(skb)->tx_pkt = tx_pkt; | |
544 | ||
ba35f858 MB |
545 | spin_lock(&port->backlog.lock); |
546 | if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { | |
b1227d01 ED |
547 | if (skb->dev) |
548 | dev_hold(skb->dev); | |
ba35f858 MB |
549 | __skb_queue_tail(&port->backlog, skb); |
550 | spin_unlock(&port->backlog.lock); | |
551 | schedule_work(&port->wq); | |
552 | } else { | |
553 | spin_unlock(&port->backlog.lock); | |
554 | atomic_long_inc(&skb->dev->rx_dropped); | |
555 | kfree_skb(skb); | |
556 | } | |
557 | } | |
558 | ||
2ad7bf36 MB |
559 | static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) |
560 | { | |
561 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
562 | void *lyr3h; | |
563 | struct ipvl_addr *addr; | |
564 | int addr_type; | |
565 | ||
5fc9220a | 566 | lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); |
2ad7bf36 MB |
567 | if (!lyr3h) |
568 | goto out; | |
569 | ||
fe89aa6b MB |
570 | if (!ipvlan_is_vepa(ipvlan->port)) { |
571 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
572 | if (addr) { | |
573 | if (ipvlan_is_private(ipvlan->port)) { | |
574 | consume_skb(skb); | |
575 | return NET_XMIT_DROP; | |
576 | } | |
577 | return ipvlan_rcv_frame(addr, &skb, true); | |
a190d04d | 578 | } |
a190d04d | 579 | } |
2ad7bf36 | 580 | out: |
b93dd49c MB |
581 | ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev); |
582 | return ipvlan_process_outbound(skb); | |
2ad7bf36 MB |
583 | } |
584 | ||
585 | static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) | |
586 | { | |
587 | const struct ipvl_dev *ipvlan = netdev_priv(dev); | |
588 | struct ethhdr *eth = eth_hdr(skb); | |
589 | struct ipvl_addr *addr; | |
590 | void *lyr3h; | |
591 | int addr_type; | |
592 | ||
fe89aa6b MB |
593 | if (!ipvlan_is_vepa(ipvlan->port) && |
594 | ether_addr_equal(eth->h_dest, eth->h_source)) { | |
5fc9220a | 595 | lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type); |
2ad7bf36 MB |
596 | if (lyr3h) { |
597 | addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); | |
a190d04d MB |
598 | if (addr) { |
599 | if (ipvlan_is_private(ipvlan->port)) { | |
600 | consume_skb(skb); | |
601 | return NET_XMIT_DROP; | |
602 | } | |
cf554ada | 603 | return ipvlan_rcv_frame(addr, &skb, true); |
a190d04d | 604 | } |
2ad7bf36 MB |
605 | } |
606 | skb = skb_share_check(skb, GFP_ATOMIC); | |
607 | if (!skb) | |
608 | return NET_XMIT_DROP; | |
609 | ||
610 | /* Packet definitely does not belong to any of the | |
611 | * virtual devices, but the dest is local. So forward | |
612 | * the skb for the main-dev. At the RX side we just return | |
613 | * RX_PASS for it to be processed further on the stack. | |
614 | */ | |
615 | return dev_forward_skb(ipvlan->phy_dev, skb); | |
616 | ||
617 | } else if (is_multicast_ether_addr(eth->h_dest)) { | |
b93dd49c | 618 | ipvlan_skb_crossing_ns(skb, NULL); |
e2525360 | 619 | ipvlan_multicast_enqueue(ipvlan->port, skb, true); |
ba35f858 | 620 | return NET_XMIT_SUCCESS; |
2ad7bf36 MB |
621 | } |
622 | ||
c0d451c8 | 623 | skb->dev = ipvlan->phy_dev; |
2ad7bf36 MB |
624 | return dev_queue_xmit(skb); |
625 | } | |
626 | ||
627 | int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) | |
628 | { | |
629 | struct ipvl_dev *ipvlan = netdev_priv(dev); | |
0fba37a3 | 630 | struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); |
2ad7bf36 MB |
631 | |
632 | if (!port) | |
633 | goto out; | |
634 | ||
635 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
636 | goto out; | |
637 | ||
638 | switch(port->mode) { | |
639 | case IPVLAN_MODE_L2: | |
640 | return ipvlan_xmit_mode_l2(skb, dev); | |
641 | case IPVLAN_MODE_L3: | |
4fbae7d8 | 642 | case IPVLAN_MODE_L3S: |
2ad7bf36 MB |
643 | return ipvlan_xmit_mode_l3(skb, dev); |
644 | } | |
645 | ||
646 | /* Should not reach here */ | |
647 | WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", | |
648 | port->mode); | |
649 | out: | |
650 | kfree_skb(skb); | |
651 | return NET_XMIT_DROP; | |
652 | } | |
653 | ||
654 | static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) | |
655 | { | |
656 | struct ethhdr *eth = eth_hdr(skb); | |
657 | struct ipvl_addr *addr; | |
658 | void *lyr3h; | |
659 | int addr_type; | |
660 | ||
661 | if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { | |
5fc9220a | 662 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
2ad7bf36 MB |
663 | if (!lyr3h) |
664 | return true; | |
665 | ||
666 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); | |
667 | if (addr) | |
668 | return false; | |
669 | } | |
670 | ||
671 | return true; | |
672 | } | |
673 | ||
674 | static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, | |
675 | struct ipvl_port *port) | |
676 | { | |
677 | void *lyr3h; | |
678 | int addr_type; | |
679 | struct ipvl_addr *addr; | |
680 | struct sk_buff *skb = *pskb; | |
681 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
682 | ||
5fc9220a | 683 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
2ad7bf36 MB |
684 | if (!lyr3h) |
685 | goto out; | |
686 | ||
687 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
688 | if (addr) | |
cf554ada | 689 | ret = ipvlan_rcv_frame(addr, pskb, false); |
2ad7bf36 MB |
690 | |
691 | out: | |
692 | return ret; | |
693 | } | |
694 | ||
695 | static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, | |
696 | struct ipvl_port *port) | |
697 | { | |
698 | struct sk_buff *skb = *pskb; | |
699 | struct ethhdr *eth = eth_hdr(skb); | |
700 | rx_handler_result_t ret = RX_HANDLER_PASS; | |
2ad7bf36 MB |
701 | |
702 | if (is_multicast_ether_addr(eth->h_dest)) { | |
ba35f858 MB |
703 | if (ipvlan_external_frame(skb, port)) { |
704 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
705 | ||
706 | /* External frames are queued for device local | |
707 | * distribution, but a copy is given to master | |
708 | * straight away to avoid sending duplicates later | |
709 | * when work-queue processes this frame. This is | |
710 | * achieved by returning RX_HANDLER_PASS. | |
711 | */ | |
b93dd49c MB |
712 | if (nskb) { |
713 | ipvlan_skb_crossing_ns(nskb, NULL); | |
e2525360 | 714 | ipvlan_multicast_enqueue(port, nskb, false); |
b93dd49c | 715 | } |
ba35f858 | 716 | } |
2ad7bf36 | 717 | } else { |
24e5992a GF |
718 | /* Perform like l3 mode for non-multicast packet */ |
719 | ret = ipvlan_handle_mode_l3(pskb, port); | |
2ad7bf36 MB |
720 | } |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
725 | rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) | |
726 | { | |
727 | struct sk_buff *skb = *pskb; | |
728 | struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); | |
729 | ||
730 | if (!port) | |
731 | return RX_HANDLER_PASS; | |
732 | ||
733 | switch (port->mode) { | |
734 | case IPVLAN_MODE_L2: | |
735 | return ipvlan_handle_mode_l2(pskb, port); | |
736 | case IPVLAN_MODE_L3: | |
737 | return ipvlan_handle_mode_l3(pskb, port); | |
4fbae7d8 MB |
738 | case IPVLAN_MODE_L3S: |
739 | return RX_HANDLER_PASS; | |
2ad7bf36 MB |
740 | } |
741 | ||
742 | /* Should not reach here */ | |
743 | WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", | |
744 | port->mode); | |
745 | kfree_skb(skb); | |
a534dc52 | 746 | return RX_HANDLER_CONSUMED; |
2ad7bf36 | 747 | } |
4fbae7d8 MB |
748 | |
749 | static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb, | |
750 | struct net_device *dev) | |
751 | { | |
752 | struct ipvl_addr *addr = NULL; | |
753 | struct ipvl_port *port; | |
754 | void *lyr3h; | |
755 | int addr_type; | |
756 | ||
757 | if (!dev || !netif_is_ipvlan_port(dev)) | |
758 | goto out; | |
759 | ||
760 | port = ipvlan_port_get_rcu(dev); | |
761 | if (!port || port->mode != IPVLAN_MODE_L3S) | |
762 | goto out; | |
763 | ||
5fc9220a | 764 | lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type); |
4fbae7d8 MB |
765 | if (!lyr3h) |
766 | goto out; | |
767 | ||
768 | addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); | |
769 | out: | |
770 | return addr; | |
771 | } | |
772 | ||
773 | struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb, | |
774 | u16 proto) | |
775 | { | |
776 | struct ipvl_addr *addr; | |
777 | struct net_device *sdev; | |
778 | ||
779 | addr = ipvlan_skb_to_addr(skb, dev); | |
780 | if (!addr) | |
781 | goto out; | |
782 | ||
783 | sdev = addr->master->dev; | |
784 | switch (proto) { | |
785 | case AF_INET: | |
786 | { | |
787 | int err; | |
788 | struct iphdr *ip4h = ip_hdr(skb); | |
789 | ||
790 | err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr, | |
791 | ip4h->tos, sdev); | |
792 | if (unlikely(err)) | |
793 | goto out; | |
794 | break; | |
795 | } | |
94333fac | 796 | #if IS_ENABLED(CONFIG_IPV6) |
4fbae7d8 MB |
797 | case AF_INET6: |
798 | { | |
799 | struct dst_entry *dst; | |
800 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
801 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
802 | struct flowi6 fl6 = { | |
803 | .flowi6_iif = sdev->ifindex, | |
804 | .daddr = ip6h->daddr, | |
805 | .saddr = ip6h->saddr, | |
806 | .flowlabel = ip6_flowinfo(ip6h), | |
807 | .flowi6_mark = skb->mark, | |
808 | .flowi6_proto = ip6h->nexthdr, | |
809 | }; | |
810 | ||
811 | skb_dst_drop(skb); | |
812 | dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6, flags); | |
813 | skb_dst_set(skb, dst); | |
814 | break; | |
815 | } | |
94333fac | 816 | #endif |
4fbae7d8 MB |
817 | default: |
818 | break; | |
819 | } | |
820 | ||
821 | out: | |
822 | return skb; | |
823 | } | |
824 | ||
825 | unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb, | |
826 | const struct nf_hook_state *state) | |
827 | { | |
828 | struct ipvl_addr *addr; | |
829 | unsigned int len; | |
830 | ||
831 | addr = ipvlan_skb_to_addr(skb, skb->dev); | |
832 | if (!addr) | |
833 | goto out; | |
834 | ||
835 | skb->dev = addr->master->dev; | |
836 | len = skb->len + ETH_HLEN; | |
837 | ipvlan_count_rx(addr->master, len, true, false); | |
838 | out: | |
839 | return NF_ACCEPT; | |
840 | } |