This source file includes following definitions.
- br_recalculate_neigh_suppress_enabled
- br_arp_send
- br_chk_addr_ip
- br_is_local_ip
- br_do_proxy_suppress_arp
- br_is_nd_neigh_msg
- br_nd_send
- br_chk_addr_ip6
- br_is_local_ip6
- br_do_suppress_nd
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12 #include <linux/kernel.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/neighbour.h>
16 #include <net/arp.h>
17 #include <linux/if_vlan.h>
18 #include <linux/inetdevice.h>
19 #include <net/addrconf.h>
20 #include <net/ipv6_stubs.h>
21 #if IS_ENABLED(CONFIG_IPV6)
22 #include <net/ip6_checksum.h>
23 #endif
24
25 #include "br_private.h"
26
27 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br)
28 {
29 struct net_bridge_port *p;
30 bool neigh_suppress = false;
31
32 list_for_each_entry(p, &br->port_list, list) {
33 if (p->flags & BR_NEIGH_SUPPRESS) {
34 neigh_suppress = true;
35 break;
36 }
37 }
38
39 br_opt_toggle(br, BROPT_NEIGH_SUPPRESS_ENABLED, neigh_suppress);
40 }
41
42 #if IS_ENABLED(CONFIG_INET)
43 static void br_arp_send(struct net_bridge *br, struct net_bridge_port *p,
44 struct net_device *dev, __be32 dest_ip, __be32 src_ip,
45 const unsigned char *dest_hw,
46 const unsigned char *src_hw,
47 const unsigned char *target_hw,
48 __be16 vlan_proto, u16 vlan_tci)
49 {
50 struct net_bridge_vlan_group *vg;
51 struct sk_buff *skb;
52 u16 pvid;
53
54 netdev_dbg(dev, "arp send dev %s dst %pI4 dst_hw %pM src %pI4 src_hw %pM\n",
55 dev->name, &dest_ip, dest_hw, &src_ip, src_hw);
56
57 if (!vlan_tci) {
58 arp_send(ARPOP_REPLY, ETH_P_ARP, dest_ip, dev, src_ip,
59 dest_hw, src_hw, target_hw);
60 return;
61 }
62
63 skb = arp_create(ARPOP_REPLY, ETH_P_ARP, dest_ip, dev, src_ip,
64 dest_hw, src_hw, target_hw);
65 if (!skb)
66 return;
67
68 if (p)
69 vg = nbp_vlan_group_rcu(p);
70 else
71 vg = br_vlan_group_rcu(br);
72 pvid = br_get_pvid(vg);
73 if (pvid == (vlan_tci & VLAN_VID_MASK))
74 vlan_tci = 0;
75
76 if (vlan_tci)
77 __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
78
79 if (p) {
80 arp_xmit(skb);
81 } else {
82 skb_reset_mac_header(skb);
83 __skb_pull(skb, skb_network_offset(skb));
84 skb->ip_summed = CHECKSUM_UNNECESSARY;
85 skb->pkt_type = PACKET_HOST;
86
87 netif_rx_ni(skb);
88 }
89 }
90
91 static int br_chk_addr_ip(struct net_device *dev, void *data)
92 {
93 __be32 ip = *(__be32 *)data;
94 struct in_device *in_dev;
95 __be32 addr = 0;
96
97 in_dev = __in_dev_get_rcu(dev);
98 if (in_dev)
99 addr = inet_confirm_addr(dev_net(dev), in_dev, 0, ip,
100 RT_SCOPE_HOST);
101
102 if (addr == ip)
103 return 1;
104
105 return 0;
106 }
107
108 static bool br_is_local_ip(struct net_device *dev, __be32 ip)
109 {
110 if (br_chk_addr_ip(dev, &ip))
111 return true;
112
113
114 if (netdev_walk_all_upper_dev_rcu(dev, br_chk_addr_ip, &ip))
115 return true;
116
117 return false;
118 }
119
120 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
121 u16 vid, struct net_bridge_port *p)
122 {
123 struct net_device *dev = br->dev;
124 struct net_device *vlandev = dev;
125 struct neighbour *n;
126 struct arphdr *parp;
127 u8 *arpptr, *sha;
128 __be32 sip, tip;
129
130 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 0;
131
132 if ((dev->flags & IFF_NOARP) ||
133 !pskb_may_pull(skb, arp_hdr_len(dev)))
134 return;
135
136 parp = arp_hdr(skb);
137
138 if (parp->ar_pro != htons(ETH_P_IP) ||
139 parp->ar_hln != dev->addr_len ||
140 parp->ar_pln != 4)
141 return;
142
143 arpptr = (u8 *)parp + sizeof(struct arphdr);
144 sha = arpptr;
145 arpptr += dev->addr_len;
146 memcpy(&sip, arpptr, sizeof(sip));
147 arpptr += sizeof(sip);
148 arpptr += dev->addr_len;
149 memcpy(&tip, arpptr, sizeof(tip));
150
151 if (ipv4_is_loopback(tip) ||
152 ipv4_is_multicast(tip))
153 return;
154
155 if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
156 if (p && (p->flags & BR_NEIGH_SUPPRESS))
157 return;
158 if (ipv4_is_zeronet(sip) || sip == tip) {
159
160 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
161 return;
162 }
163 }
164
165 if (parp->ar_op != htons(ARPOP_REQUEST))
166 return;
167
168 if (vid != 0) {
169 vlandev = __vlan_find_dev_deep_rcu(br->dev, skb->vlan_proto,
170 vid);
171 if (!vlandev)
172 return;
173 }
174
175 if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
176 br_is_local_ip(vlandev, tip)) {
177
178
179
180 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
181 return;
182 }
183
184 n = neigh_lookup(&arp_tbl, &tip, vlandev);
185 if (n) {
186 struct net_bridge_fdb_entry *f;
187
188 if (!(n->nud_state & NUD_VALID)) {
189 neigh_release(n);
190 return;
191 }
192
193 f = br_fdb_find_rcu(br, n->ha, vid);
194 if (f) {
195 bool replied = false;
196
197 if ((p && (p->flags & BR_PROXYARP)) ||
198 (f->dst && (f->dst->flags & (BR_PROXYARP_WIFI |
199 BR_NEIGH_SUPPRESS)))) {
200 if (!vid)
201 br_arp_send(br, p, skb->dev, sip, tip,
202 sha, n->ha, sha, 0, 0);
203 else
204 br_arp_send(br, p, skb->dev, sip, tip,
205 sha, n->ha, sha,
206 skb->vlan_proto,
207 skb_vlan_tag_get(skb));
208 replied = true;
209 }
210
211
212
213
214 if (replied ||
215 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
216 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
217 }
218
219 neigh_release(n);
220 }
221 }
222 #endif
223
224 #if IS_ENABLED(CONFIG_IPV6)
225 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *msg)
226 {
227 struct nd_msg *m;
228
229 m = skb_header_pointer(skb, skb_network_offset(skb) +
230 sizeof(struct ipv6hdr), sizeof(*msg), msg);
231 if (!m)
232 return NULL;
233
234 if (m->icmph.icmp6_code != 0 ||
235 (m->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION &&
236 m->icmph.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT))
237 return NULL;
238
239 return m;
240 }
241
242 static void br_nd_send(struct net_bridge *br, struct net_bridge_port *p,
243 struct sk_buff *request, struct neighbour *n,
244 __be16 vlan_proto, u16 vlan_tci, struct nd_msg *ns)
245 {
246 struct net_device *dev = request->dev;
247 struct net_bridge_vlan_group *vg;
248 struct sk_buff *reply;
249 struct nd_msg *na;
250 struct ipv6hdr *pip6;
251 int na_olen = 8;
252 int ns_olen;
253 int i, len;
254 u8 *daddr;
255 u16 pvid;
256
257 if (!dev)
258 return;
259
260 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
261 sizeof(*na) + na_olen + dev->needed_tailroom;
262
263 reply = alloc_skb(len, GFP_ATOMIC);
264 if (!reply)
265 return;
266
267 reply->protocol = htons(ETH_P_IPV6);
268 reply->dev = dev;
269 skb_reserve(reply, LL_RESERVED_SPACE(dev));
270 skb_push(reply, sizeof(struct ethhdr));
271 skb_set_mac_header(reply, 0);
272
273 daddr = eth_hdr(request)->h_source;
274
275
276 ns_olen = request->len - (skb_network_offset(request) +
277 sizeof(struct ipv6hdr)) - sizeof(*ns);
278 for (i = 0; i < ns_olen - 1; i += (ns->opt[i + 1] << 3)) {
279 if (!ns->opt[i + 1]) {
280 kfree_skb(reply);
281 return;
282 }
283 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
284 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
285 break;
286 }
287 }
288
289
290 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
291 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
292 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
293 reply->protocol = htons(ETH_P_IPV6);
294
295 skb_pull(reply, sizeof(struct ethhdr));
296 skb_set_network_header(reply, 0);
297 skb_put(reply, sizeof(struct ipv6hdr));
298
299
300 pip6 = ipv6_hdr(reply);
301 memset(pip6, 0, sizeof(struct ipv6hdr));
302 pip6->version = 6;
303 pip6->priority = ipv6_hdr(request)->priority;
304 pip6->nexthdr = IPPROTO_ICMPV6;
305 pip6->hop_limit = 255;
306 pip6->daddr = ipv6_hdr(request)->saddr;
307 pip6->saddr = *(struct in6_addr *)n->primary_key;
308
309 skb_pull(reply, sizeof(struct ipv6hdr));
310 skb_set_transport_header(reply, 0);
311
312 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
313
314
315 memset(na, 0, sizeof(*na) + na_olen);
316 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
317 na->icmph.icmp6_router = (n->flags & NTF_ROUTER) ? 1 : 0;
318 na->icmph.icmp6_override = 1;
319 na->icmph.icmp6_solicited = 1;
320 na->target = ns->target;
321 ether_addr_copy(&na->opt[2], n->ha);
322 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
323 na->opt[1] = na_olen >> 3;
324
325 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
326 &pip6->daddr,
327 sizeof(*na) + na_olen,
328 IPPROTO_ICMPV6,
329 csum_partial(na, sizeof(*na) + na_olen, 0));
330
331 pip6->payload_len = htons(sizeof(*na) + na_olen);
332
333 skb_push(reply, sizeof(struct ipv6hdr));
334 skb_push(reply, sizeof(struct ethhdr));
335
336 reply->ip_summed = CHECKSUM_UNNECESSARY;
337
338 if (p)
339 vg = nbp_vlan_group_rcu(p);
340 else
341 vg = br_vlan_group_rcu(br);
342 pvid = br_get_pvid(vg);
343 if (pvid == (vlan_tci & VLAN_VID_MASK))
344 vlan_tci = 0;
345
346 if (vlan_tci)
347 __vlan_hwaccel_put_tag(reply, vlan_proto, vlan_tci);
348
349 netdev_dbg(dev, "nd send dev %s dst %pI6 dst_hw %pM src %pI6 src_hw %pM\n",
350 dev->name, &pip6->daddr, daddr, &pip6->saddr, n->ha);
351
352 if (p) {
353 dev_queue_xmit(reply);
354 } else {
355 skb_reset_mac_header(reply);
356 __skb_pull(reply, skb_network_offset(reply));
357 reply->ip_summed = CHECKSUM_UNNECESSARY;
358 reply->pkt_type = PACKET_HOST;
359
360 netif_rx_ni(reply);
361 }
362 }
363
364 static int br_chk_addr_ip6(struct net_device *dev, void *data)
365 {
366 struct in6_addr *addr = (struct in6_addr *)data;
367
368 if (ipv6_chk_addr(dev_net(dev), addr, dev, 0))
369 return 1;
370
371 return 0;
372 }
373
374 static bool br_is_local_ip6(struct net_device *dev, struct in6_addr *addr)
375
376 {
377 if (br_chk_addr_ip6(dev, addr))
378 return true;
379
380
381 if (netdev_walk_all_upper_dev_rcu(dev, br_chk_addr_ip6, addr))
382 return true;
383
384 return false;
385 }
386
387 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
388 u16 vid, struct net_bridge_port *p, struct nd_msg *msg)
389 {
390 struct net_device *dev = br->dev;
391 struct net_device *vlandev = NULL;
392 struct in6_addr *saddr, *daddr;
393 struct ipv6hdr *iphdr;
394 struct neighbour *n;
395
396 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 0;
397
398 if (p && (p->flags & BR_NEIGH_SUPPRESS))
399 return;
400
401 if (msg->icmph.icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT &&
402 !msg->icmph.icmp6_solicited) {
403
404 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
405 return;
406 }
407
408 if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
409 return;
410
411 iphdr = ipv6_hdr(skb);
412 saddr = &iphdr->saddr;
413 daddr = &iphdr->daddr;
414
415 if (ipv6_addr_any(saddr) || !ipv6_addr_cmp(saddr, daddr)) {
416
417 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
418 return;
419 }
420
421 if (vid != 0) {
422
423 vlandev = __vlan_find_dev_deep_rcu(br->dev, skb->vlan_proto,
424 vid);
425 if (!vlandev)
426 return;
427 } else {
428 vlandev = dev;
429 }
430
431 if (br_is_local_ip6(vlandev, &msg->target)) {
432
433
434
435 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
436 return;
437 }
438
439 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, vlandev);
440 if (n) {
441 struct net_bridge_fdb_entry *f;
442
443 if (!(n->nud_state & NUD_VALID)) {
444 neigh_release(n);
445 return;
446 }
447
448 f = br_fdb_find_rcu(br, n->ha, vid);
449 if (f) {
450 bool replied = false;
451
452 if (f->dst && (f->dst->flags & BR_NEIGH_SUPPRESS)) {
453 if (vid != 0)
454 br_nd_send(br, p, skb, n,
455 skb->vlan_proto,
456 skb_vlan_tag_get(skb), msg);
457 else
458 br_nd_send(br, p, skb, n, 0, 0, msg);
459 replied = true;
460 }
461
462
463
464
465
466 if (replied ||
467 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED))
468 BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1;
469 }
470 neigh_release(n);
471 }
472 }
473 #endif