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Commit | Line | Data |
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7bc570c8 YH |
1 | /* |
2 | * Linux IPv6 multicast routing support for BSD pim6sd | |
3 | * Based on net/ipv4/ipmr.c. | |
4 | * | |
5 | * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> | |
6 | * LSIIT Laboratory, Strasbourg, France | |
7 | * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> | |
8 | * 6WIND, Paris, France | |
9 | * Copyright (C)2007,2008 USAGI/WIDE Project | |
10 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <asm/system.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/timer.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/stat.h> | |
29 | #include <linux/socket.h> | |
7bc570c8 YH |
30 | #include <linux/inet.h> |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/inetdevice.h> | |
7bc570c8 YH |
33 | #include <linux/proc_fs.h> |
34 | #include <linux/seq_file.h> | |
7bc570c8 | 35 | #include <linux/init.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
7bc570c8 YH |
37 | #include <net/protocol.h> |
38 | #include <linux/skbuff.h> | |
39 | #include <net/sock.h> | |
7bc570c8 | 40 | #include <net/raw.h> |
7bc570c8 YH |
41 | #include <linux/notifier.h> |
42 | #include <linux/if_arp.h> | |
7bc570c8 YH |
43 | #include <net/checksum.h> |
44 | #include <net/netlink.h> | |
45 | ||
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <linux/mroute6.h> | |
14fb64e1 | 49 | #include <linux/pim.h> |
7bc570c8 YH |
50 | #include <net/addrconf.h> |
51 | #include <linux/netfilter_ipv6.h> | |
5d6e430d | 52 | #include <net/ip6_checksum.h> |
7bc570c8 | 53 | |
7bc570c8 YH |
54 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
55 | Note that the changes are semaphored via rtnl_lock. | |
56 | */ | |
57 | ||
58 | static DEFINE_RWLOCK(mrt_lock); | |
59 | ||
60 | /* | |
61 | * Multicast router control variables | |
62 | */ | |
63 | ||
4e16880c | 64 | #define MIF_EXISTS(_net, _idx) ((_net)->ipv6.vif6_table[_idx].dev != NULL) |
7bc570c8 | 65 | |
7bc570c8 | 66 | static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
7bc570c8 YH |
67 | |
68 | /* Special spinlock for queue of unresolved entries */ | |
69 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
70 | ||
71 | /* We return to original Alan's scheme. Hash table of resolved | |
72 | entries is changed only in process context and protected | |
73 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
74 | with strong spinlock mfc_unres_lock. | |
75 | ||
76 | In this case data path is free of exclusive locks at all. | |
77 | */ | |
78 | ||
79 | static struct kmem_cache *mrt_cachep __read_mostly; | |
80 | ||
81 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache); | |
8229efda BT |
82 | static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, |
83 | mifi_t mifi, int assert); | |
7bc570c8 | 84 | static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm); |
8229efda | 85 | static void mroute_clean_tables(struct net *net); |
7bc570c8 YH |
86 | |
87 | static struct timer_list ipmr_expire_timer; | |
88 | ||
89 | ||
90 | #ifdef CONFIG_PROC_FS | |
91 | ||
92 | struct ipmr_mfc_iter { | |
8b90fc7e | 93 | struct seq_net_private p; |
7bc570c8 YH |
94 | struct mfc6_cache **cache; |
95 | int ct; | |
96 | }; | |
97 | ||
98 | ||
8b90fc7e BT |
99 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
100 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 YH |
101 | { |
102 | struct mfc6_cache *mfc; | |
103 | ||
8b90fc7e | 104 | it->cache = net->ipv6.mfc6_cache_array; |
7bc570c8 | 105 | read_lock(&mrt_lock); |
4a6258a0 | 106 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) |
8b90fc7e | 107 | for (mfc = net->ipv6.mfc6_cache_array[it->ct]; |
4a6258a0 | 108 | mfc; mfc = mfc->next) |
7bc570c8 YH |
109 | if (pos-- == 0) |
110 | return mfc; | |
111 | read_unlock(&mrt_lock); | |
112 | ||
113 | it->cache = &mfc_unres_queue; | |
114 | spin_lock_bh(&mfc_unres_lock); | |
115 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) | |
8b90fc7e BT |
116 | if (net_eq(mfc6_net(mfc), net) && |
117 | pos-- == 0) | |
7bc570c8 YH |
118 | return mfc; |
119 | spin_unlock_bh(&mfc_unres_lock); | |
120 | ||
121 | it->cache = NULL; | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | ||
126 | ||
127 | ||
128 | /* | |
129 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
130 | */ | |
131 | ||
132 | struct ipmr_vif_iter { | |
8b90fc7e | 133 | struct seq_net_private p; |
7bc570c8 YH |
134 | int ct; |
135 | }; | |
136 | ||
8b90fc7e BT |
137 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
138 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
139 | loff_t pos) |
140 | { | |
8b90fc7e BT |
141 | for (iter->ct = 0; iter->ct < net->ipv6.maxvif; ++iter->ct) { |
142 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 YH |
143 | continue; |
144 | if (pos-- == 0) | |
8b90fc7e | 145 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
146 | } |
147 | return NULL; | |
148 | } | |
149 | ||
150 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
151 | __acquires(mrt_lock) | |
152 | { | |
8b90fc7e BT |
153 | struct net *net = seq_file_net(seq); |
154 | ||
7bc570c8 | 155 | read_lock(&mrt_lock); |
8b90fc7e BT |
156 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
157 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
158 | } |
159 | ||
160 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
161 | { | |
162 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 163 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
164 | |
165 | ++*pos; | |
166 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 167 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 168 | |
8b90fc7e BT |
169 | while (++iter->ct < net->ipv6.maxvif) { |
170 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 | 171 | continue; |
8b90fc7e | 172 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
173 | } |
174 | return NULL; | |
175 | } | |
176 | ||
177 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
178 | __releases(mrt_lock) | |
179 | { | |
180 | read_unlock(&mrt_lock); | |
181 | } | |
182 | ||
183 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
184 | { | |
8b90fc7e BT |
185 | struct net *net = seq_file_net(seq); |
186 | ||
7bc570c8 YH |
187 | if (v == SEQ_START_TOKEN) { |
188 | seq_puts(seq, | |
189 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
190 | } else { | |
191 | const struct mif_device *vif = v; | |
192 | const char *name = vif->dev ? vif->dev->name : "none"; | |
193 | ||
194 | seq_printf(seq, | |
d430a227 | 195 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
8b90fc7e | 196 | vif - net->ipv6.vif6_table, |
7bc570c8 YH |
197 | name, vif->bytes_in, vif->pkt_in, |
198 | vif->bytes_out, vif->pkt_out, | |
199 | vif->flags); | |
200 | } | |
201 | return 0; | |
202 | } | |
203 | ||
98147d52 | 204 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
205 | .start = ip6mr_vif_seq_start, |
206 | .next = ip6mr_vif_seq_next, | |
207 | .stop = ip6mr_vif_seq_stop, | |
208 | .show = ip6mr_vif_seq_show, | |
209 | }; | |
210 | ||
211 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
212 | { | |
8b90fc7e BT |
213 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
214 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
215 | } |
216 | ||
5ca1b998 | 217 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
218 | .owner = THIS_MODULE, |
219 | .open = ip6mr_vif_open, | |
220 | .read = seq_read, | |
221 | .llseek = seq_lseek, | |
8b90fc7e | 222 | .release = seq_release_net, |
7bc570c8 YH |
223 | }; |
224 | ||
225 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
226 | { | |
8b90fc7e BT |
227 | struct net *net = seq_file_net(seq); |
228 | ||
229 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) | |
230 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
231 | } |
232 | ||
233 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
234 | { | |
235 | struct mfc6_cache *mfc = v; | |
236 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 237 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
238 | |
239 | ++*pos; | |
240 | ||
241 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 242 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 YH |
243 | |
244 | if (mfc->next) | |
245 | return mfc->next; | |
246 | ||
247 | if (it->cache == &mfc_unres_queue) | |
248 | goto end_of_list; | |
249 | ||
8b90fc7e | 250 | BUG_ON(it->cache != net->ipv6.mfc6_cache_array); |
7bc570c8 | 251 | |
4a6258a0 | 252 | while (++it->ct < MFC6_LINES) { |
8b90fc7e | 253 | mfc = net->ipv6.mfc6_cache_array[it->ct]; |
7bc570c8 YH |
254 | if (mfc) |
255 | return mfc; | |
256 | } | |
257 | ||
258 | /* exhausted cache_array, show unresolved */ | |
259 | read_unlock(&mrt_lock); | |
260 | it->cache = &mfc_unres_queue; | |
261 | it->ct = 0; | |
262 | ||
263 | spin_lock_bh(&mfc_unres_lock); | |
264 | mfc = mfc_unres_queue; | |
265 | if (mfc) | |
266 | return mfc; | |
267 | ||
268 | end_of_list: | |
269 | spin_unlock_bh(&mfc_unres_lock); | |
270 | it->cache = NULL; | |
271 | ||
272 | return NULL; | |
273 | } | |
274 | ||
275 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
276 | { | |
277 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 278 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
279 | |
280 | if (it->cache == &mfc_unres_queue) | |
281 | spin_unlock_bh(&mfc_unres_lock); | |
8b90fc7e | 282 | else if (it->cache == net->ipv6.mfc6_cache_array) |
7bc570c8 YH |
283 | read_unlock(&mrt_lock); |
284 | } | |
285 | ||
286 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
287 | { | |
288 | int n; | |
8b90fc7e | 289 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
290 | |
291 | if (v == SEQ_START_TOKEN) { | |
292 | seq_puts(seq, | |
293 | "Group " | |
294 | "Origin " | |
295 | "Iif Pkts Bytes Wrong Oifs\n"); | |
296 | } else { | |
297 | const struct mfc6_cache *mfc = v; | |
298 | const struct ipmr_mfc_iter *it = seq->private; | |
299 | ||
999890b2 | 300 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 301 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 302 | mfc->mf6c_parent); |
7bc570c8 YH |
303 | |
304 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
305 | seq_printf(seq, " %8lu %8lu %8lu", |
306 | mfc->mfc_un.res.pkt, | |
307 | mfc->mfc_un.res.bytes, | |
308 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
309 | for (n = mfc->mfc_un.res.minvif; |
310 | n < mfc->mfc_un.res.maxvif; n++) { | |
8b90fc7e | 311 | if (MIF_EXISTS(net, n) && |
7bc570c8 YH |
312 | mfc->mfc_un.res.ttls[n] < 255) |
313 | seq_printf(seq, | |
314 | " %2d:%-3d", | |
315 | n, mfc->mfc_un.res.ttls[n]); | |
316 | } | |
1ea472e2 BT |
317 | } else { |
318 | /* unresolved mfc_caches don't contain | |
319 | * pkt, bytes and wrong_if values | |
320 | */ | |
321 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
322 | } |
323 | seq_putc(seq, '\n'); | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
88e9d34c | 328 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
329 | .start = ipmr_mfc_seq_start, |
330 | .next = ipmr_mfc_seq_next, | |
331 | .stop = ipmr_mfc_seq_stop, | |
332 | .show = ipmr_mfc_seq_show, | |
333 | }; | |
334 | ||
335 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
336 | { | |
8b90fc7e BT |
337 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
338 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
339 | } |
340 | ||
5ca1b998 | 341 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
342 | .owner = THIS_MODULE, |
343 | .open = ipmr_mfc_open, | |
344 | .read = seq_read, | |
345 | .llseek = seq_lseek, | |
8b90fc7e | 346 | .release = seq_release_net, |
7bc570c8 YH |
347 | }; |
348 | #endif | |
349 | ||
14fb64e1 | 350 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
351 | |
352 | static int pim6_rcv(struct sk_buff *skb) | |
353 | { | |
354 | struct pimreghdr *pim; | |
355 | struct ipv6hdr *encap; | |
356 | struct net_device *reg_dev = NULL; | |
8229efda BT |
357 | struct net *net = dev_net(skb->dev); |
358 | int reg_vif_num = net->ipv6.mroute_reg_vif_num; | |
14fb64e1 YH |
359 | |
360 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
361 | goto drop; | |
362 | ||
363 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
364 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
365 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
366 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
367 | sizeof(*pim), IPPROTO_PIM, | |
368 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 369 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
370 | goto drop; |
371 | ||
372 | /* check if the inner packet is destined to mcast group */ | |
373 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
374 | sizeof(*pim)); | |
375 | ||
376 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
377 | encap->payload_len == 0 || | |
378 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
379 | goto drop; | |
380 | ||
381 | read_lock(&mrt_lock); | |
382 | if (reg_vif_num >= 0) | |
8229efda | 383 | reg_dev = net->ipv6.vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
384 | if (reg_dev) |
385 | dev_hold(reg_dev); | |
386 | read_unlock(&mrt_lock); | |
387 | ||
388 | if (reg_dev == NULL) | |
389 | goto drop; | |
390 | ||
391 | skb->mac_header = skb->network_header; | |
392 | skb_pull(skb, (u8 *)encap - skb->data); | |
393 | skb_reset_network_header(skb); | |
394 | skb->dev = reg_dev; | |
1d6e55f1 | 395 | skb->protocol = htons(ETH_P_IPV6); |
14fb64e1 YH |
396 | skb->ip_summed = 0; |
397 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 398 | skb_dst_drop(skb); |
dc58c78c PE |
399 | reg_dev->stats.rx_bytes += skb->len; |
400 | reg_dev->stats.rx_packets++; | |
14fb64e1 YH |
401 | nf_reset(skb); |
402 | netif_rx(skb); | |
403 | dev_put(reg_dev); | |
404 | return 0; | |
405 | drop: | |
406 | kfree_skb(skb); | |
407 | return 0; | |
408 | } | |
409 | ||
41135cc8 | 410 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
411 | .handler = pim6_rcv, |
412 | }; | |
413 | ||
414 | /* Service routines creating virtual interfaces: PIMREG */ | |
415 | ||
6fef4c0c SH |
416 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
417 | struct net_device *dev) | |
14fb64e1 | 418 | { |
8229efda BT |
419 | struct net *net = dev_net(dev); |
420 | ||
14fb64e1 | 421 | read_lock(&mrt_lock); |
dc58c78c PE |
422 | dev->stats.tx_bytes += skb->len; |
423 | dev->stats.tx_packets++; | |
8229efda BT |
424 | ip6mr_cache_report(net, skb, net->ipv6.mroute_reg_vif_num, |
425 | MRT6MSG_WHOLEPKT); | |
14fb64e1 YH |
426 | read_unlock(&mrt_lock); |
427 | kfree_skb(skb); | |
6ed10654 | 428 | return NETDEV_TX_OK; |
14fb64e1 YH |
429 | } |
430 | ||
007c3838 SH |
431 | static const struct net_device_ops reg_vif_netdev_ops = { |
432 | .ndo_start_xmit = reg_vif_xmit, | |
433 | }; | |
434 | ||
14fb64e1 YH |
435 | static void reg_vif_setup(struct net_device *dev) |
436 | { | |
437 | dev->type = ARPHRD_PIMREG; | |
438 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
439 | dev->flags = IFF_NOARP; | |
007c3838 | 440 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 441 | dev->destructor = free_netdev; |
403dbb97 | 442 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
443 | } |
444 | ||
8229efda | 445 | static struct net_device *ip6mr_reg_vif(struct net *net) |
14fb64e1 YH |
446 | { |
447 | struct net_device *dev; | |
14fb64e1 | 448 | |
dc58c78c | 449 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
14fb64e1 YH |
450 | if (dev == NULL) |
451 | return NULL; | |
452 | ||
8229efda BT |
453 | dev_net_set(dev, net); |
454 | ||
14fb64e1 YH |
455 | if (register_netdevice(dev)) { |
456 | free_netdev(dev); | |
457 | return NULL; | |
458 | } | |
459 | dev->iflink = 0; | |
460 | ||
14fb64e1 YH |
461 | if (dev_open(dev)) |
462 | goto failure; | |
463 | ||
7af3db78 | 464 | dev_hold(dev); |
14fb64e1 YH |
465 | return dev; |
466 | ||
467 | failure: | |
468 | /* allow the register to be completed before unregistering. */ | |
469 | rtnl_unlock(); | |
470 | rtnl_lock(); | |
471 | ||
472 | unregister_netdevice(dev); | |
473 | return NULL; | |
474 | } | |
475 | #endif | |
476 | ||
7bc570c8 YH |
477 | /* |
478 | * Delete a VIF entry | |
479 | */ | |
480 | ||
c871e664 | 481 | static int mif6_delete(struct net *net, int vifi, struct list_head *head) |
7bc570c8 YH |
482 | { |
483 | struct mif_device *v; | |
484 | struct net_device *dev; | |
1d6e55f1 | 485 | struct inet6_dev *in6_dev; |
8229efda | 486 | if (vifi < 0 || vifi >= net->ipv6.maxvif) |
7bc570c8 YH |
487 | return -EADDRNOTAVAIL; |
488 | ||
8229efda | 489 | v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 YH |
490 | |
491 | write_lock_bh(&mrt_lock); | |
492 | dev = v->dev; | |
493 | v->dev = NULL; | |
494 | ||
495 | if (!dev) { | |
496 | write_unlock_bh(&mrt_lock); | |
497 | return -EADDRNOTAVAIL; | |
498 | } | |
499 | ||
14fb64e1 | 500 | #ifdef CONFIG_IPV6_PIMSM_V2 |
8229efda BT |
501 | if (vifi == net->ipv6.mroute_reg_vif_num) |
502 | net->ipv6.mroute_reg_vif_num = -1; | |
14fb64e1 YH |
503 | #endif |
504 | ||
8229efda | 505 | if (vifi + 1 == net->ipv6.maxvif) { |
7bc570c8 YH |
506 | int tmp; |
507 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
8229efda | 508 | if (MIF_EXISTS(net, tmp)) |
7bc570c8 YH |
509 | break; |
510 | } | |
8229efda | 511 | net->ipv6.maxvif = tmp + 1; |
7bc570c8 YH |
512 | } |
513 | ||
514 | write_unlock_bh(&mrt_lock); | |
515 | ||
516 | dev_set_allmulti(dev, -1); | |
517 | ||
1d6e55f1 TG |
518 | in6_dev = __in6_dev_get(dev); |
519 | if (in6_dev) | |
520 | in6_dev->cnf.mc_forwarding--; | |
521 | ||
7bc570c8 | 522 | if (v->flags & MIFF_REGISTER) |
c871e664 | 523 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
524 | |
525 | dev_put(dev); | |
526 | return 0; | |
527 | } | |
528 | ||
58701ad4 BT |
529 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
530 | { | |
531 | release_net(mfc6_net(c)); | |
532 | kmem_cache_free(mrt_cachep, c); | |
533 | } | |
534 | ||
7bc570c8 YH |
535 | /* Destroy an unresolved cache entry, killing queued skbs |
536 | and reporting error to netlink readers. | |
537 | */ | |
538 | ||
539 | static void ip6mr_destroy_unres(struct mfc6_cache *c) | |
540 | { | |
541 | struct sk_buff *skb; | |
8229efda | 542 | struct net *net = mfc6_net(c); |
7bc570c8 | 543 | |
8229efda | 544 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
545 | |
546 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
547 | if (ipv6_hdr(skb)->version == 0) { | |
548 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
549 | nlh->nlmsg_type = NLMSG_ERROR; | |
550 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
551 | skb_trim(skb, nlh->nlmsg_len); | |
552 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 553 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
554 | } else |
555 | kfree_skb(skb); | |
556 | } | |
557 | ||
58701ad4 | 558 | ip6mr_cache_free(c); |
7bc570c8 YH |
559 | } |
560 | ||
561 | ||
562 | /* Single timer process for all the unresolved queue. */ | |
563 | ||
564 | static void ipmr_do_expire_process(unsigned long dummy) | |
565 | { | |
566 | unsigned long now = jiffies; | |
567 | unsigned long expires = 10 * HZ; | |
568 | struct mfc6_cache *c, **cp; | |
569 | ||
570 | cp = &mfc_unres_queue; | |
571 | ||
572 | while ((c = *cp) != NULL) { | |
573 | if (time_after(c->mfc_un.unres.expires, now)) { | |
574 | /* not yet... */ | |
575 | unsigned long interval = c->mfc_un.unres.expires - now; | |
576 | if (interval < expires) | |
577 | expires = interval; | |
578 | cp = &c->next; | |
579 | continue; | |
580 | } | |
581 | ||
582 | *cp = c->next; | |
583 | ip6mr_destroy_unres(c); | |
584 | } | |
585 | ||
4045e57c | 586 | if (mfc_unres_queue != NULL) |
7bc570c8 YH |
587 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
588 | } | |
589 | ||
590 | static void ipmr_expire_process(unsigned long dummy) | |
591 | { | |
592 | if (!spin_trylock(&mfc_unres_lock)) { | |
593 | mod_timer(&ipmr_expire_timer, jiffies + 1); | |
594 | return; | |
595 | } | |
596 | ||
4045e57c | 597 | if (mfc_unres_queue != NULL) |
7bc570c8 YH |
598 | ipmr_do_expire_process(dummy); |
599 | ||
600 | spin_unlock(&mfc_unres_lock); | |
601 | } | |
602 | ||
603 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
604 | ||
605 | static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls) | |
606 | { | |
607 | int vifi; | |
8229efda | 608 | struct net *net = mfc6_net(cache); |
7bc570c8 | 609 | |
6ac7eb08 | 610 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 611 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 612 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 613 | |
8229efda BT |
614 | for (vifi = 0; vifi < net->ipv6.maxvif; vifi++) { |
615 | if (MIF_EXISTS(net, vifi) && | |
4e16880c | 616 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
617 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
618 | if (cache->mfc_un.res.minvif > vifi) | |
619 | cache->mfc_un.res.minvif = vifi; | |
620 | if (cache->mfc_un.res.maxvif <= vifi) | |
621 | cache->mfc_un.res.maxvif = vifi + 1; | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
8229efda | 626 | static int mif6_add(struct net *net, struct mif6ctl *vifc, int mrtsock) |
7bc570c8 YH |
627 | { |
628 | int vifi = vifc->mif6c_mifi; | |
8229efda | 629 | struct mif_device *v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 | 630 | struct net_device *dev; |
1d6e55f1 | 631 | struct inet6_dev *in6_dev; |
5ae7b444 | 632 | int err; |
7bc570c8 YH |
633 | |
634 | /* Is vif busy ? */ | |
8229efda | 635 | if (MIF_EXISTS(net, vifi)) |
7bc570c8 YH |
636 | return -EADDRINUSE; |
637 | ||
638 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
639 | #ifdef CONFIG_IPV6_PIMSM_V2 |
640 | case MIFF_REGISTER: | |
641 | /* | |
642 | * Special Purpose VIF in PIM | |
643 | * All the packets will be sent to the daemon | |
644 | */ | |
8229efda | 645 | if (net->ipv6.mroute_reg_vif_num >= 0) |
14fb64e1 | 646 | return -EADDRINUSE; |
8229efda | 647 | dev = ip6mr_reg_vif(net); |
14fb64e1 YH |
648 | if (!dev) |
649 | return -ENOBUFS; | |
5ae7b444 WC |
650 | err = dev_set_allmulti(dev, 1); |
651 | if (err) { | |
652 | unregister_netdevice(dev); | |
7af3db78 | 653 | dev_put(dev); |
5ae7b444 WC |
654 | return err; |
655 | } | |
14fb64e1 YH |
656 | break; |
657 | #endif | |
7bc570c8 | 658 | case 0: |
8229efda | 659 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
660 | if (!dev) |
661 | return -EADDRNOTAVAIL; | |
5ae7b444 | 662 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
663 | if (err) { |
664 | dev_put(dev); | |
5ae7b444 | 665 | return err; |
7af3db78 | 666 | } |
7bc570c8 YH |
667 | break; |
668 | default: | |
669 | return -EINVAL; | |
670 | } | |
671 | ||
1d6e55f1 TG |
672 | in6_dev = __in6_dev_get(dev); |
673 | if (in6_dev) | |
674 | in6_dev->cnf.mc_forwarding++; | |
675 | ||
7bc570c8 YH |
676 | /* |
677 | * Fill in the VIF structures | |
678 | */ | |
679 | v->rate_limit = vifc->vifc_rate_limit; | |
680 | v->flags = vifc->mif6c_flags; | |
681 | if (!mrtsock) | |
682 | v->flags |= VIFF_STATIC; | |
683 | v->threshold = vifc->vifc_threshold; | |
684 | v->bytes_in = 0; | |
685 | v->bytes_out = 0; | |
686 | v->pkt_in = 0; | |
687 | v->pkt_out = 0; | |
688 | v->link = dev->ifindex; | |
689 | if (v->flags & MIFF_REGISTER) | |
690 | v->link = dev->iflink; | |
691 | ||
692 | /* And finish update writing critical data */ | |
693 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 694 | v->dev = dev; |
14fb64e1 YH |
695 | #ifdef CONFIG_IPV6_PIMSM_V2 |
696 | if (v->flags & MIFF_REGISTER) | |
8229efda | 697 | net->ipv6.mroute_reg_vif_num = vifi; |
14fb64e1 | 698 | #endif |
8229efda BT |
699 | if (vifi + 1 > net->ipv6.maxvif) |
700 | net->ipv6.maxvif = vifi + 1; | |
7bc570c8 YH |
701 | write_unlock_bh(&mrt_lock); |
702 | return 0; | |
703 | } | |
704 | ||
8229efda BT |
705 | static struct mfc6_cache *ip6mr_cache_find(struct net *net, |
706 | struct in6_addr *origin, | |
707 | struct in6_addr *mcastgrp) | |
7bc570c8 YH |
708 | { |
709 | int line = MFC6_HASH(mcastgrp, origin); | |
710 | struct mfc6_cache *c; | |
711 | ||
8229efda | 712 | for (c = net->ipv6.mfc6_cache_array[line]; c; c = c->next) { |
7bc570c8 YH |
713 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
714 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
715 | break; | |
716 | } | |
717 | return c; | |
718 | } | |
719 | ||
720 | /* | |
721 | * Allocate a multicast cache entry | |
722 | */ | |
58701ad4 | 723 | static struct mfc6_cache *ip6mr_cache_alloc(struct net *net) |
7bc570c8 | 724 | { |
36cbac59 | 725 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
726 | if (c == NULL) |
727 | return NULL; | |
6ac7eb08 | 728 | c->mfc_un.res.minvif = MAXMIFS; |
58701ad4 | 729 | mfc6_net_set(c, net); |
7bc570c8 YH |
730 | return c; |
731 | } | |
732 | ||
58701ad4 | 733 | static struct mfc6_cache *ip6mr_cache_alloc_unres(struct net *net) |
7bc570c8 | 734 | { |
36cbac59 | 735 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
736 | if (c == NULL) |
737 | return NULL; | |
7bc570c8 YH |
738 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
739 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
58701ad4 | 740 | mfc6_net_set(c, net); |
7bc570c8 YH |
741 | return c; |
742 | } | |
743 | ||
744 | /* | |
745 | * A cache entry has gone into a resolved state from queued | |
746 | */ | |
747 | ||
748 | static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c) | |
749 | { | |
750 | struct sk_buff *skb; | |
751 | ||
752 | /* | |
753 | * Play the pending entries through our router | |
754 | */ | |
755 | ||
756 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
757 | if (ipv6_hdr(skb)->version == 0) { | |
758 | int err; | |
759 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
760 | ||
761 | if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
549e028d | 762 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
763 | } else { |
764 | nlh->nlmsg_type = NLMSG_ERROR; | |
765 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
766 | skb_trim(skb, nlh->nlmsg_len); | |
767 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
768 | } | |
8229efda | 769 | err = rtnl_unicast(skb, mfc6_net(uc), NETLINK_CB(skb).pid); |
7bc570c8 YH |
770 | } else |
771 | ip6_mr_forward(skb, c); | |
772 | } | |
773 | } | |
774 | ||
775 | /* | |
776 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
777 | * expects the following bizarre scheme. | |
778 | * | |
779 | * Called under mrt_lock. | |
780 | */ | |
781 | ||
8229efda BT |
782 | static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, mifi_t mifi, |
783 | int assert) | |
7bc570c8 YH |
784 | { |
785 | struct sk_buff *skb; | |
786 | struct mrt6msg *msg; | |
787 | int ret; | |
788 | ||
14fb64e1 YH |
789 | #ifdef CONFIG_IPV6_PIMSM_V2 |
790 | if (assert == MRT6MSG_WHOLEPKT) | |
791 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
792 | +sizeof(*msg)); | |
793 | else | |
794 | #endif | |
795 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
796 | |
797 | if (!skb) | |
798 | return -ENOBUFS; | |
799 | ||
800 | /* I suppose that internal messages | |
801 | * do not require checksums */ | |
802 | ||
803 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
804 | ||
14fb64e1 YH |
805 | #ifdef CONFIG_IPV6_PIMSM_V2 |
806 | if (assert == MRT6MSG_WHOLEPKT) { | |
807 | /* Ugly, but we have no choice with this interface. | |
808 | Duplicate old header, fix length etc. | |
809 | And all this only to mangle msg->im6_msgtype and | |
810 | to set msg->im6_mbz to "mbz" :-) | |
811 | */ | |
812 | skb_push(skb, -skb_network_offset(pkt)); | |
813 | ||
814 | skb_push(skb, sizeof(*msg)); | |
815 | skb_reset_transport_header(skb); | |
816 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
817 | msg->im6_mbz = 0; | |
818 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
8229efda | 819 | msg->im6_mif = net->ipv6.mroute_reg_vif_num; |
14fb64e1 YH |
820 | msg->im6_pad = 0; |
821 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
822 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
823 | ||
824 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
825 | } else | |
826 | #endif | |
827 | { | |
7bc570c8 YH |
828 | /* |
829 | * Copy the IP header | |
830 | */ | |
831 | ||
832 | skb_put(skb, sizeof(struct ipv6hdr)); | |
833 | skb_reset_network_header(skb); | |
834 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
835 | ||
836 | /* | |
837 | * Add our header | |
838 | */ | |
839 | skb_put(skb, sizeof(*msg)); | |
840 | skb_reset_transport_header(skb); | |
841 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
842 | ||
843 | msg->im6_mbz = 0; | |
844 | msg->im6_msgtype = assert; | |
6ac7eb08 | 845 | msg->im6_mif = mifi; |
7bc570c8 YH |
846 | msg->im6_pad = 0; |
847 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
848 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
849 | ||
adf30907 | 850 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 851 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 852 | } |
7bc570c8 | 853 | |
8229efda | 854 | if (net->ipv6.mroute6_sk == NULL) { |
7bc570c8 YH |
855 | kfree_skb(skb); |
856 | return -EINVAL; | |
857 | } | |
858 | ||
859 | /* | |
860 | * Deliver to user space multicast routing algorithms | |
861 | */ | |
8229efda | 862 | ret = sock_queue_rcv_skb(net->ipv6.mroute6_sk, skb); |
bd91b8bf | 863 | if (ret < 0) { |
7bc570c8 YH |
864 | if (net_ratelimit()) |
865 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
866 | kfree_skb(skb); | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Queue a packet for resolution. It gets locked cache entry! | |
874 | */ | |
875 | ||
876 | static int | |
8229efda | 877 | ip6mr_cache_unresolved(struct net *net, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 YH |
878 | { |
879 | int err; | |
880 | struct mfc6_cache *c; | |
881 | ||
882 | spin_lock_bh(&mfc_unres_lock); | |
883 | for (c = mfc_unres_queue; c; c = c->next) { | |
8229efda | 884 | if (net_eq(mfc6_net(c), net) && |
4045e57c | 885 | ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
7bc570c8 YH |
886 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) |
887 | break; | |
888 | } | |
889 | ||
890 | if (c == NULL) { | |
891 | /* | |
892 | * Create a new entry if allowable | |
893 | */ | |
894 | ||
8229efda BT |
895 | if (atomic_read(&net->ipv6.cache_resolve_queue_len) >= 10 || |
896 | (c = ip6mr_cache_alloc_unres(net)) == NULL) { | |
7bc570c8 YH |
897 | spin_unlock_bh(&mfc_unres_lock); |
898 | ||
899 | kfree_skb(skb); | |
900 | return -ENOBUFS; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Fill in the new cache entry | |
905 | */ | |
906 | c->mf6c_parent = -1; | |
907 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
908 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
909 | ||
910 | /* | |
911 | * Reflect first query at pim6sd | |
912 | */ | |
8229efda BT |
913 | err = ip6mr_cache_report(net, skb, mifi, MRT6MSG_NOCACHE); |
914 | if (err < 0) { | |
7bc570c8 YH |
915 | /* If the report failed throw the cache entry |
916 | out - Brad Parker | |
917 | */ | |
918 | spin_unlock_bh(&mfc_unres_lock); | |
919 | ||
58701ad4 | 920 | ip6mr_cache_free(c); |
7bc570c8 YH |
921 | kfree_skb(skb); |
922 | return err; | |
923 | } | |
924 | ||
8229efda | 925 | atomic_inc(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
926 | c->next = mfc_unres_queue; |
927 | mfc_unres_queue = c; | |
928 | ||
929 | ipmr_do_expire_process(1); | |
930 | } | |
931 | ||
932 | /* | |
933 | * See if we can append the packet | |
934 | */ | |
935 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
936 | kfree_skb(skb); | |
937 | err = -ENOBUFS; | |
938 | } else { | |
939 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
940 | err = 0; | |
941 | } | |
942 | ||
943 | spin_unlock_bh(&mfc_unres_lock); | |
944 | return err; | |
945 | } | |
946 | ||
947 | /* | |
948 | * MFC6 cache manipulation by user space | |
949 | */ | |
950 | ||
8229efda | 951 | static int ip6mr_mfc_delete(struct net *net, struct mf6cctl *mfc) |
7bc570c8 YH |
952 | { |
953 | int line; | |
954 | struct mfc6_cache *c, **cp; | |
955 | ||
956 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
957 | ||
8229efda | 958 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 959 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
960 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
961 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
962 | write_lock_bh(&mrt_lock); | |
963 | *cp = c->next; | |
964 | write_unlock_bh(&mrt_lock); | |
965 | ||
58701ad4 | 966 | ip6mr_cache_free(c); |
7bc570c8 YH |
967 | return 0; |
968 | } | |
969 | } | |
970 | return -ENOENT; | |
971 | } | |
972 | ||
973 | static int ip6mr_device_event(struct notifier_block *this, | |
974 | unsigned long event, void *ptr) | |
975 | { | |
976 | struct net_device *dev = ptr; | |
8229efda | 977 | struct net *net = dev_net(dev); |
7bc570c8 YH |
978 | struct mif_device *v; |
979 | int ct; | |
c871e664 | 980 | LIST_HEAD(list); |
7bc570c8 | 981 | |
7bc570c8 YH |
982 | if (event != NETDEV_UNREGISTER) |
983 | return NOTIFY_DONE; | |
984 | ||
8229efda BT |
985 | v = &net->ipv6.vif6_table[0]; |
986 | for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) { | |
7bc570c8 | 987 | if (v->dev == dev) |
c871e664 | 988 | mif6_delete(net, ct, &list); |
7bc570c8 | 989 | } |
c871e664 ED |
990 | unregister_netdevice_many(&list); |
991 | ||
7bc570c8 YH |
992 | return NOTIFY_DONE; |
993 | } | |
994 | ||
995 | static struct notifier_block ip6_mr_notifier = { | |
996 | .notifier_call = ip6mr_device_event | |
997 | }; | |
998 | ||
999 | /* | |
1000 | * Setup for IP multicast routing | |
1001 | */ | |
1002 | ||
4e16880c BT |
1003 | static int __net_init ip6mr_net_init(struct net *net) |
1004 | { | |
1005 | int err = 0; | |
4e16880c BT |
1006 | net->ipv6.vif6_table = kcalloc(MAXMIFS, sizeof(struct mif_device), |
1007 | GFP_KERNEL); | |
1008 | if (!net->ipv6.vif6_table) { | |
1009 | err = -ENOMEM; | |
1010 | goto fail; | |
1011 | } | |
4a6258a0 BT |
1012 | |
1013 | /* Forwarding cache */ | |
1014 | net->ipv6.mfc6_cache_array = kcalloc(MFC6_LINES, | |
1015 | sizeof(struct mfc6_cache *), | |
1016 | GFP_KERNEL); | |
1017 | if (!net->ipv6.mfc6_cache_array) { | |
1018 | err = -ENOMEM; | |
1019 | goto fail_mfc6_cache; | |
1020 | } | |
950d5704 BT |
1021 | |
1022 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1023 | net->ipv6.mroute_reg_vif_num = -1; | |
1024 | #endif | |
8b90fc7e BT |
1025 | |
1026 | #ifdef CONFIG_PROC_FS | |
1027 | err = -ENOMEM; | |
1028 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1029 | goto proc_vif_fail; | |
1030 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1031 | goto proc_cache_fail; | |
1032 | #endif | |
4a6258a0 BT |
1033 | return 0; |
1034 | ||
8b90fc7e BT |
1035 | #ifdef CONFIG_PROC_FS |
1036 | proc_cache_fail: | |
1037 | proc_net_remove(net, "ip6_mr_vif"); | |
1038 | proc_vif_fail: | |
1039 | kfree(net->ipv6.mfc6_cache_array); | |
1040 | #endif | |
4a6258a0 BT |
1041 | fail_mfc6_cache: |
1042 | kfree(net->ipv6.vif6_table); | |
4e16880c BT |
1043 | fail: |
1044 | return err; | |
1045 | } | |
1046 | ||
1047 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1048 | { | |
8b90fc7e BT |
1049 | #ifdef CONFIG_PROC_FS |
1050 | proc_net_remove(net, "ip6_mr_cache"); | |
1051 | proc_net_remove(net, "ip6_mr_vif"); | |
1052 | #endif | |
8229efda | 1053 | mroute_clean_tables(net); |
4a6258a0 | 1054 | kfree(net->ipv6.mfc6_cache_array); |
4e16880c BT |
1055 | kfree(net->ipv6.vif6_table); |
1056 | } | |
1057 | ||
1058 | static struct pernet_operations ip6mr_net_ops = { | |
1059 | .init = ip6mr_net_init, | |
1060 | .exit = ip6mr_net_exit, | |
1061 | }; | |
1062 | ||
623d1a1a | 1063 | int __init ip6_mr_init(void) |
7bc570c8 | 1064 | { |
623d1a1a WC |
1065 | int err; |
1066 | ||
7bc570c8 YH |
1067 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1068 | sizeof(struct mfc6_cache), | |
1069 | 0, SLAB_HWCACHE_ALIGN, | |
1070 | NULL); | |
1071 | if (!mrt_cachep) | |
623d1a1a | 1072 | return -ENOMEM; |
7bc570c8 | 1073 | |
4e16880c BT |
1074 | err = register_pernet_subsys(&ip6mr_net_ops); |
1075 | if (err) | |
1076 | goto reg_pernet_fail; | |
1077 | ||
7bc570c8 | 1078 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
623d1a1a WC |
1079 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1080 | if (err) | |
1081 | goto reg_notif_fail; | |
403dbb97 TG |
1082 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1083 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
1084 | printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); | |
1085 | err = -EAGAIN; | |
1086 | goto add_proto_fail; | |
1087 | } | |
1088 | #endif | |
623d1a1a | 1089 | return 0; |
403dbb97 TG |
1090 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1091 | add_proto_fail: | |
1092 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1093 | #endif | |
87b30a65 BT |
1094 | reg_notif_fail: |
1095 | del_timer(&ipmr_expire_timer); | |
4e16880c BT |
1096 | unregister_pernet_subsys(&ip6mr_net_ops); |
1097 | reg_pernet_fail: | |
87b30a65 | 1098 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1099 | return err; |
7bc570c8 YH |
1100 | } |
1101 | ||
623d1a1a WC |
1102 | void ip6_mr_cleanup(void) |
1103 | { | |
623d1a1a WC |
1104 | unregister_netdevice_notifier(&ip6_mr_notifier); |
1105 | del_timer(&ipmr_expire_timer); | |
4e16880c | 1106 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1107 | kmem_cache_destroy(mrt_cachep); |
1108 | } | |
7bc570c8 | 1109 | |
8229efda | 1110 | static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock) |
7bc570c8 YH |
1111 | { |
1112 | int line; | |
1113 | struct mfc6_cache *uc, *c, **cp; | |
6ac7eb08 | 1114 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1115 | int i; |
1116 | ||
a50436f2 PM |
1117 | if (mfc->mf6cc_parent >= MAXMIFS) |
1118 | return -ENFILE; | |
1119 | ||
6ac7eb08 RR |
1120 | memset(ttls, 255, MAXMIFS); |
1121 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1122 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1123 | ttls[i] = 1; | |
1124 | ||
1125 | } | |
1126 | ||
1127 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1128 | ||
8229efda | 1129 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 1130 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
1131 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1132 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | if (c != NULL) { | |
1137 | write_lock_bh(&mrt_lock); | |
1138 | c->mf6c_parent = mfc->mf6cc_parent; | |
1139 | ip6mr_update_thresholds(c, ttls); | |
1140 | if (!mrtsock) | |
1141 | c->mfc_flags |= MFC_STATIC; | |
1142 | write_unlock_bh(&mrt_lock); | |
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1147 | return -EINVAL; | |
1148 | ||
8229efda | 1149 | c = ip6mr_cache_alloc(net); |
7bc570c8 YH |
1150 | if (c == NULL) |
1151 | return -ENOMEM; | |
1152 | ||
1153 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1154 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1155 | c->mf6c_parent = mfc->mf6cc_parent; | |
1156 | ip6mr_update_thresholds(c, ttls); | |
1157 | if (!mrtsock) | |
1158 | c->mfc_flags |= MFC_STATIC; | |
1159 | ||
1160 | write_lock_bh(&mrt_lock); | |
8229efda BT |
1161 | c->next = net->ipv6.mfc6_cache_array[line]; |
1162 | net->ipv6.mfc6_cache_array[line] = c; | |
7bc570c8 YH |
1163 | write_unlock_bh(&mrt_lock); |
1164 | ||
1165 | /* | |
1166 | * Check to see if we resolved a queued list. If so we | |
1167 | * need to send on the frames and tidy up. | |
1168 | */ | |
1169 | spin_lock_bh(&mfc_unres_lock); | |
1170 | for (cp = &mfc_unres_queue; (uc = *cp) != NULL; | |
1171 | cp = &uc->next) { | |
8229efda | 1172 | if (net_eq(mfc6_net(uc), net) && |
4045e57c | 1173 | ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 YH |
1174 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
1175 | *cp = uc->next; | |
8229efda | 1176 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
1177 | break; |
1178 | } | |
1179 | } | |
4045e57c BT |
1180 | if (mfc_unres_queue == NULL) |
1181 | del_timer(&ipmr_expire_timer); | |
7bc570c8 YH |
1182 | spin_unlock_bh(&mfc_unres_lock); |
1183 | ||
1184 | if (uc) { | |
1185 | ip6mr_cache_resolve(uc, c); | |
58701ad4 | 1186 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1187 | } |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Close the multicast socket, and clear the vif tables etc | |
1193 | */ | |
1194 | ||
8229efda | 1195 | static void mroute_clean_tables(struct net *net) |
7bc570c8 YH |
1196 | { |
1197 | int i; | |
c871e664 | 1198 | LIST_HEAD(list); |
7bc570c8 YH |
1199 | |
1200 | /* | |
1201 | * Shut down all active vif entries | |
1202 | */ | |
8229efda BT |
1203 | for (i = 0; i < net->ipv6.maxvif; i++) { |
1204 | if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC)) | |
c871e664 | 1205 | mif6_delete(net, i, &list); |
7bc570c8 | 1206 | } |
c871e664 | 1207 | unregister_netdevice_many(&list); |
7bc570c8 YH |
1208 | |
1209 | /* | |
1210 | * Wipe the cache | |
1211 | */ | |
4a6258a0 | 1212 | for (i = 0; i < MFC6_LINES; i++) { |
7bc570c8 YH |
1213 | struct mfc6_cache *c, **cp; |
1214 | ||
8229efda | 1215 | cp = &net->ipv6.mfc6_cache_array[i]; |
7bc570c8 YH |
1216 | while ((c = *cp) != NULL) { |
1217 | if (c->mfc_flags & MFC_STATIC) { | |
1218 | cp = &c->next; | |
1219 | continue; | |
1220 | } | |
1221 | write_lock_bh(&mrt_lock); | |
1222 | *cp = c->next; | |
1223 | write_unlock_bh(&mrt_lock); | |
1224 | ||
58701ad4 | 1225 | ip6mr_cache_free(c); |
7bc570c8 YH |
1226 | } |
1227 | } | |
1228 | ||
8229efda | 1229 | if (atomic_read(&net->ipv6.cache_resolve_queue_len) != 0) { |
4045e57c | 1230 | struct mfc6_cache *c, **cp; |
7bc570c8 YH |
1231 | |
1232 | spin_lock_bh(&mfc_unres_lock); | |
4045e57c BT |
1233 | cp = &mfc_unres_queue; |
1234 | while ((c = *cp) != NULL) { | |
8229efda | 1235 | if (!net_eq(mfc6_net(c), net)) { |
4045e57c BT |
1236 | cp = &c->next; |
1237 | continue; | |
1238 | } | |
1239 | *cp = c->next; | |
7bc570c8 | 1240 | ip6mr_destroy_unres(c); |
7bc570c8 YH |
1241 | } |
1242 | spin_unlock_bh(&mfc_unres_lock); | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | static int ip6mr_sk_init(struct sock *sk) | |
1247 | { | |
1248 | int err = 0; | |
8229efda | 1249 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1250 | |
1251 | rtnl_lock(); | |
1252 | write_lock_bh(&mrt_lock); | |
1d6e55f1 | 1253 | if (likely(net->ipv6.mroute6_sk == NULL)) { |
8229efda | 1254 | net->ipv6.mroute6_sk = sk; |
1d6e55f1 TG |
1255 | net->ipv6.devconf_all->mc_forwarding++; |
1256 | } | |
7bc570c8 YH |
1257 | else |
1258 | err = -EADDRINUSE; | |
1259 | write_unlock_bh(&mrt_lock); | |
1260 | ||
1261 | rtnl_unlock(); | |
1262 | ||
1263 | return err; | |
1264 | } | |
1265 | ||
1266 | int ip6mr_sk_done(struct sock *sk) | |
1267 | { | |
1268 | int err = 0; | |
8229efda | 1269 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1270 | |
1271 | rtnl_lock(); | |
8229efda | 1272 | if (sk == net->ipv6.mroute6_sk) { |
7bc570c8 | 1273 | write_lock_bh(&mrt_lock); |
8229efda | 1274 | net->ipv6.mroute6_sk = NULL; |
1d6e55f1 | 1275 | net->ipv6.devconf_all->mc_forwarding--; |
7bc570c8 YH |
1276 | write_unlock_bh(&mrt_lock); |
1277 | ||
8229efda | 1278 | mroute_clean_tables(net); |
7bc570c8 YH |
1279 | } else |
1280 | err = -EACCES; | |
1281 | rtnl_unlock(); | |
1282 | ||
1283 | return err; | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Socket options and virtual interface manipulation. The whole | |
1288 | * virtual interface system is a complete heap, but unfortunately | |
1289 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1290 | * MOSPF/PIM router set up we can clean this up. | |
1291 | */ | |
1292 | ||
b7058842 | 1293 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1294 | { |
1295 | int ret; | |
1296 | struct mif6ctl vif; | |
1297 | struct mf6cctl mfc; | |
1298 | mifi_t mifi; | |
8229efda | 1299 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1300 | |
1301 | if (optname != MRT6_INIT) { | |
8229efda | 1302 | if (sk != net->ipv6.mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1303 | return -EACCES; |
1304 | } | |
1305 | ||
1306 | switch (optname) { | |
1307 | case MRT6_INIT: | |
1308 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1309 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1310 | return -EOPNOTSUPP; |
1311 | if (optlen < sizeof(int)) | |
1312 | return -EINVAL; | |
1313 | ||
1314 | return ip6mr_sk_init(sk); | |
1315 | ||
1316 | case MRT6_DONE: | |
1317 | return ip6mr_sk_done(sk); | |
1318 | ||
1319 | case MRT6_ADD_MIF: | |
1320 | if (optlen < sizeof(vif)) | |
1321 | return -EINVAL; | |
1322 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1323 | return -EFAULT; | |
6ac7eb08 | 1324 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1325 | return -ENFILE; |
1326 | rtnl_lock(); | |
8229efda | 1327 | ret = mif6_add(net, &vif, sk == net->ipv6.mroute6_sk); |
7bc570c8 YH |
1328 | rtnl_unlock(); |
1329 | return ret; | |
1330 | ||
1331 | case MRT6_DEL_MIF: | |
1332 | if (optlen < sizeof(mifi_t)) | |
1333 | return -EINVAL; | |
1334 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1335 | return -EFAULT; | |
1336 | rtnl_lock(); | |
c871e664 | 1337 | ret = mif6_delete(net, mifi, NULL); |
7bc570c8 YH |
1338 | rtnl_unlock(); |
1339 | return ret; | |
1340 | ||
1341 | /* | |
1342 | * Manipulate the forwarding caches. These live | |
1343 | * in a sort of kernel/user symbiosis. | |
1344 | */ | |
1345 | case MRT6_ADD_MFC: | |
1346 | case MRT6_DEL_MFC: | |
1347 | if (optlen < sizeof(mfc)) | |
1348 | return -EINVAL; | |
1349 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1350 | return -EFAULT; | |
1351 | rtnl_lock(); | |
1352 | if (optname == MRT6_DEL_MFC) | |
8229efda | 1353 | ret = ip6mr_mfc_delete(net, &mfc); |
7bc570c8 | 1354 | else |
8229efda BT |
1355 | ret = ip6mr_mfc_add(net, &mfc, |
1356 | sk == net->ipv6.mroute6_sk); | |
7bc570c8 YH |
1357 | rtnl_unlock(); |
1358 | return ret; | |
1359 | ||
14fb64e1 YH |
1360 | /* |
1361 | * Control PIM assert (to activate pim will activate assert) | |
1362 | */ | |
1363 | case MRT6_ASSERT: | |
1364 | { | |
1365 | int v; | |
1366 | if (get_user(v, (int __user *)optval)) | |
1367 | return -EFAULT; | |
8229efda | 1368 | net->ipv6.mroute_do_assert = !!v; |
14fb64e1 YH |
1369 | return 0; |
1370 | } | |
1371 | ||
1372 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1373 | case MRT6_PIM: | |
1374 | { | |
a9f83bf3 | 1375 | int v; |
14fb64e1 YH |
1376 | if (get_user(v, (int __user *)optval)) |
1377 | return -EFAULT; | |
1378 | v = !!v; | |
1379 | rtnl_lock(); | |
1380 | ret = 0; | |
8229efda BT |
1381 | if (v != net->ipv6.mroute_do_pim) { |
1382 | net->ipv6.mroute_do_pim = v; | |
1383 | net->ipv6.mroute_do_assert = v; | |
14fb64e1 YH |
1384 | } |
1385 | rtnl_unlock(); | |
1386 | return ret; | |
1387 | } | |
1388 | ||
1389 | #endif | |
7bc570c8 | 1390 | /* |
7d120c55 | 1391 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1392 | * set. |
1393 | */ | |
1394 | default: | |
1395 | return -ENOPROTOOPT; | |
1396 | } | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Getsock opt support for the multicast routing system. | |
1401 | */ | |
1402 | ||
1403 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1404 | int __user *optlen) | |
1405 | { | |
1406 | int olr; | |
1407 | int val; | |
8229efda | 1408 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1409 | |
1410 | switch (optname) { | |
1411 | case MRT6_VERSION: | |
1412 | val = 0x0305; | |
1413 | break; | |
14fb64e1 YH |
1414 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1415 | case MRT6_PIM: | |
8229efda | 1416 | val = net->ipv6.mroute_do_pim; |
14fb64e1 YH |
1417 | break; |
1418 | #endif | |
1419 | case MRT6_ASSERT: | |
8229efda | 1420 | val = net->ipv6.mroute_do_assert; |
14fb64e1 | 1421 | break; |
7bc570c8 YH |
1422 | default: |
1423 | return -ENOPROTOOPT; | |
1424 | } | |
1425 | ||
1426 | if (get_user(olr, optlen)) | |
1427 | return -EFAULT; | |
1428 | ||
1429 | olr = min_t(int, olr, sizeof(int)); | |
1430 | if (olr < 0) | |
1431 | return -EINVAL; | |
1432 | ||
1433 | if (put_user(olr, optlen)) | |
1434 | return -EFAULT; | |
1435 | if (copy_to_user(optval, &val, olr)) | |
1436 | return -EFAULT; | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * The IP multicast ioctl support routines. | |
1442 | */ | |
1443 | ||
1444 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1445 | { | |
1446 | struct sioc_sg_req6 sr; | |
1447 | struct sioc_mif_req6 vr; | |
1448 | struct mif_device *vif; | |
1449 | struct mfc6_cache *c; | |
8229efda | 1450 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1451 | |
1452 | switch (cmd) { | |
1453 | case SIOCGETMIFCNT_IN6: | |
1454 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1455 | return -EFAULT; | |
8229efda | 1456 | if (vr.mifi >= net->ipv6.maxvif) |
7bc570c8 YH |
1457 | return -EINVAL; |
1458 | read_lock(&mrt_lock); | |
8229efda BT |
1459 | vif = &net->ipv6.vif6_table[vr.mifi]; |
1460 | if (MIF_EXISTS(net, vr.mifi)) { | |
7bc570c8 YH |
1461 | vr.icount = vif->pkt_in; |
1462 | vr.ocount = vif->pkt_out; | |
1463 | vr.ibytes = vif->bytes_in; | |
1464 | vr.obytes = vif->bytes_out; | |
1465 | read_unlock(&mrt_lock); | |
1466 | ||
1467 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1468 | return -EFAULT; | |
1469 | return 0; | |
1470 | } | |
1471 | read_unlock(&mrt_lock); | |
1472 | return -EADDRNOTAVAIL; | |
1473 | case SIOCGETSGCNT_IN6: | |
1474 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1475 | return -EFAULT; | |
1476 | ||
1477 | read_lock(&mrt_lock); | |
8229efda | 1478 | c = ip6mr_cache_find(net, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1479 | if (c) { |
1480 | sr.pktcnt = c->mfc_un.res.pkt; | |
1481 | sr.bytecnt = c->mfc_un.res.bytes; | |
1482 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1483 | read_unlock(&mrt_lock); | |
1484 | ||
1485 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1486 | return -EFAULT; | |
1487 | return 0; | |
1488 | } | |
1489 | read_unlock(&mrt_lock); | |
1490 | return -EADDRNOTAVAIL; | |
1491 | default: | |
1492 | return -ENOIOCTLCMD; | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | ||
1497 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1498 | { | |
adf30907 | 1499 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1500 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1501 | return dst_output(skb); |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * Processing handlers for ip6mr_forward | |
1506 | */ | |
1507 | ||
1508 | static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
1509 | { | |
1510 | struct ipv6hdr *ipv6h; | |
8229efda BT |
1511 | struct net *net = mfc6_net(c); |
1512 | struct mif_device *vif = &net->ipv6.vif6_table[vifi]; | |
7bc570c8 YH |
1513 | struct net_device *dev; |
1514 | struct dst_entry *dst; | |
1515 | struct flowi fl; | |
1516 | ||
1517 | if (vif->dev == NULL) | |
1518 | goto out_free; | |
1519 | ||
14fb64e1 YH |
1520 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1521 | if (vif->flags & MIFF_REGISTER) { | |
1522 | vif->pkt_out++; | |
1523 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1524 | vif->dev->stats.tx_bytes += skb->len; |
1525 | vif->dev->stats.tx_packets++; | |
8229efda | 1526 | ip6mr_cache_report(net, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1527 | goto out_free; |
14fb64e1 YH |
1528 | } |
1529 | #endif | |
1530 | ||
7bc570c8 YH |
1531 | ipv6h = ipv6_hdr(skb); |
1532 | ||
1533 | fl = (struct flowi) { | |
1534 | .oif = vif->link, | |
1535 | .nl_u = { .ip6_u = | |
1536 | { .daddr = ipv6h->daddr, } | |
1537 | } | |
1538 | }; | |
1539 | ||
8229efda | 1540 | dst = ip6_route_output(net, NULL, &fl); |
7bc570c8 YH |
1541 | if (!dst) |
1542 | goto out_free; | |
1543 | ||
adf30907 ED |
1544 | skb_dst_drop(skb); |
1545 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1546 | |
1547 | /* | |
1548 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1549 | * not only before forwarding, but after forwarding on all output | |
1550 | * interfaces. It is clear, if mrouter runs a multicasting | |
1551 | * program, it should receive packets not depending to what interface | |
1552 | * program is joined. | |
1553 | * If we will not make it, the program will have to join on all | |
1554 | * interfaces. On the other hand, multihoming host (or router, but | |
1555 | * not mrouter) cannot join to more than one interface - it will | |
1556 | * result in receiving multiple packets. | |
1557 | */ | |
1558 | dev = vif->dev; | |
1559 | skb->dev = dev; | |
1560 | vif->pkt_out++; | |
1561 | vif->bytes_out += skb->len; | |
1562 | ||
1563 | /* We are about to write */ | |
1564 | /* XXX: extension headers? */ | |
1565 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1566 | goto out_free; | |
1567 | ||
1568 | ipv6h = ipv6_hdr(skb); | |
1569 | ipv6h->hop_limit--; | |
1570 | ||
1571 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1572 | ||
b2e0b385 | 1573 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1574 | ip6mr_forward2_finish); |
1575 | ||
1576 | out_free: | |
1577 | kfree_skb(skb); | |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | static int ip6mr_find_vif(struct net_device *dev) | |
1582 | { | |
8229efda | 1583 | struct net *net = dev_net(dev); |
7bc570c8 | 1584 | int ct; |
8229efda BT |
1585 | for (ct = net->ipv6.maxvif - 1; ct >= 0; ct--) { |
1586 | if (net->ipv6.vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1587 | break; |
1588 | } | |
1589 | return ct; | |
1590 | } | |
1591 | ||
1592 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache) | |
1593 | { | |
1594 | int psend = -1; | |
1595 | int vif, ct; | |
8229efda | 1596 | struct net *net = mfc6_net(cache); |
7bc570c8 YH |
1597 | |
1598 | vif = cache->mf6c_parent; | |
1599 | cache->mfc_un.res.pkt++; | |
1600 | cache->mfc_un.res.bytes += skb->len; | |
1601 | ||
14fb64e1 YH |
1602 | /* |
1603 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1604 | */ | |
8229efda | 1605 | if (net->ipv6.vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1606 | int true_vifi; |
1607 | ||
1608 | cache->mfc_un.res.wrong_if++; | |
1609 | true_vifi = ip6mr_find_vif(skb->dev); | |
1610 | ||
8229efda | 1611 | if (true_vifi >= 0 && net->ipv6.mroute_do_assert && |
14fb64e1 YH |
1612 | /* pimsm uses asserts, when switching from RPT to SPT, |
1613 | so that we cannot check that packet arrived on an oif. | |
1614 | It is bad, but otherwise we would need to move pretty | |
1615 | large chunk of pimd to kernel. Ough... --ANK | |
1616 | */ | |
8229efda | 1617 | (net->ipv6.mroute_do_pim || |
a21f3f99 | 1618 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
1619 | time_after(jiffies, |
1620 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1621 | cache->mfc_un.res.last_assert = jiffies; | |
8229efda | 1622 | ip6mr_cache_report(net, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
1623 | } |
1624 | goto dont_forward; | |
1625 | } | |
1626 | ||
8229efda BT |
1627 | net->ipv6.vif6_table[vif].pkt_in++; |
1628 | net->ipv6.vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
1629 | |
1630 | /* | |
1631 | * Forward the frame | |
1632 | */ | |
1633 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1634 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1635 | if (psend != -1) { | |
1636 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1637 | if (skb2) | |
1638 | ip6mr_forward2(skb2, cache, psend); | |
1639 | } | |
1640 | psend = ct; | |
1641 | } | |
1642 | } | |
1643 | if (psend != -1) { | |
1644 | ip6mr_forward2(skb, cache, psend); | |
1645 | return 0; | |
1646 | } | |
1647 | ||
14fb64e1 | 1648 | dont_forward: |
7bc570c8 YH |
1649 | kfree_skb(skb); |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | ||
1654 | /* | |
1655 | * Multicast packets for forwarding arrive here | |
1656 | */ | |
1657 | ||
1658 | int ip6_mr_input(struct sk_buff *skb) | |
1659 | { | |
1660 | struct mfc6_cache *cache; | |
8229efda | 1661 | struct net *net = dev_net(skb->dev); |
7bc570c8 YH |
1662 | |
1663 | read_lock(&mrt_lock); | |
8229efda BT |
1664 | cache = ip6mr_cache_find(net, |
1665 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); | |
7bc570c8 YH |
1666 | |
1667 | /* | |
1668 | * No usable cache entry | |
1669 | */ | |
1670 | if (cache == NULL) { | |
1671 | int vif; | |
1672 | ||
1673 | vif = ip6mr_find_vif(skb->dev); | |
1674 | if (vif >= 0) { | |
8229efda | 1675 | int err = ip6mr_cache_unresolved(net, vif, skb); |
7bc570c8 YH |
1676 | read_unlock(&mrt_lock); |
1677 | ||
1678 | return err; | |
1679 | } | |
1680 | read_unlock(&mrt_lock); | |
1681 | kfree_skb(skb); | |
1682 | return -ENODEV; | |
1683 | } | |
1684 | ||
1685 | ip6_mr_forward(skb, cache); | |
1686 | ||
1687 | read_unlock(&mrt_lock); | |
1688 | ||
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | ||
1693 | static int | |
1694 | ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm) | |
1695 | { | |
1696 | int ct; | |
1697 | struct rtnexthop *nhp; | |
8229efda | 1698 | struct net *net = mfc6_net(c); |
549e028d | 1699 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
1700 | struct rtattr *mp_head; |
1701 | ||
7438189b ND |
1702 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1703 | if (c->mf6c_parent > MAXMIFS) | |
1704 | return -ENOENT; | |
1705 | ||
1706 | if (MIF_EXISTS(net, c->mf6c_parent)) | |
1707 | RTA_PUT(skb, RTA_IIF, 4, &net->ipv6.vif6_table[c->mf6c_parent].dev->ifindex); | |
7bc570c8 YH |
1708 | |
1709 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
1710 | ||
1711 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
7438189b | 1712 | if (MIF_EXISTS(net, ct) && c->mfc_un.res.ttls[ct] < 255) { |
7bc570c8 YH |
1713 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1714 | goto rtattr_failure; | |
1715 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1716 | nhp->rtnh_flags = 0; | |
1717 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
8229efda | 1718 | nhp->rtnh_ifindex = net->ipv6.vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
1719 | nhp->rtnh_len = sizeof(*nhp); |
1720 | } | |
1721 | } | |
1722 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 1723 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
1724 | rtm->rtm_type = RTN_MULTICAST; |
1725 | return 1; | |
1726 | ||
1727 | rtattr_failure: | |
1728 | nlmsg_trim(skb, b); | |
1729 | return -EMSGSIZE; | |
1730 | } | |
1731 | ||
8229efda BT |
1732 | int ip6mr_get_route(struct net *net, |
1733 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
1734 | { |
1735 | int err; | |
1736 | struct mfc6_cache *cache; | |
adf30907 | 1737 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 YH |
1738 | |
1739 | read_lock(&mrt_lock); | |
8229efda | 1740 | cache = ip6mr_cache_find(net, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
1741 | |
1742 | if (!cache) { | |
1743 | struct sk_buff *skb2; | |
1744 | struct ipv6hdr *iph; | |
1745 | struct net_device *dev; | |
1746 | int vif; | |
1747 | ||
1748 | if (nowait) { | |
1749 | read_unlock(&mrt_lock); | |
1750 | return -EAGAIN; | |
1751 | } | |
1752 | ||
1753 | dev = skb->dev; | |
1754 | if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { | |
1755 | read_unlock(&mrt_lock); | |
1756 | return -ENODEV; | |
1757 | } | |
1758 | ||
1759 | /* really correct? */ | |
1760 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
1761 | if (!skb2) { | |
1762 | read_unlock(&mrt_lock); | |
1763 | return -ENOMEM; | |
1764 | } | |
1765 | ||
1766 | skb_reset_transport_header(skb2); | |
1767 | ||
1768 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
1769 | skb_reset_network_header(skb2); | |
1770 | ||
1771 | iph = ipv6_hdr(skb2); | |
1772 | iph->version = 0; | |
1773 | iph->priority = 0; | |
1774 | iph->flow_lbl[0] = 0; | |
1775 | iph->flow_lbl[1] = 0; | |
1776 | iph->flow_lbl[2] = 0; | |
1777 | iph->payload_len = 0; | |
1778 | iph->nexthdr = IPPROTO_NONE; | |
1779 | iph->hop_limit = 0; | |
1780 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
1781 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
1782 | ||
8229efda | 1783 | err = ip6mr_cache_unresolved(net, vif, skb2); |
7bc570c8 YH |
1784 | read_unlock(&mrt_lock); |
1785 | ||
1786 | return err; | |
1787 | } | |
1788 | ||
1789 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1790 | cache->mfc_flags |= MFC_NOTIFY; | |
1791 | ||
1792 | err = ip6mr_fill_mroute(skb, cache, rtm); | |
1793 | read_unlock(&mrt_lock); | |
1794 | return err; | |
1795 | } | |
1796 |