Commit | Line | Data |
---|---|---|
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> |
7bc570c8 YH |
36 | #include <net/protocol.h> |
37 | #include <linux/skbuff.h> | |
38 | #include <net/sock.h> | |
7bc570c8 | 39 | #include <net/raw.h> |
7bc570c8 YH |
40 | #include <linux/notifier.h> |
41 | #include <linux/if_arp.h> | |
7bc570c8 YH |
42 | #include <net/checksum.h> |
43 | #include <net/netlink.h> | |
44 | ||
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <linux/mroute6.h> | |
14fb64e1 | 48 | #include <linux/pim.h> |
7bc570c8 YH |
49 | #include <net/addrconf.h> |
50 | #include <linux/netfilter_ipv6.h> | |
5d6e430d | 51 | #include <net/ip6_checksum.h> |
7bc570c8 | 52 | |
7bc570c8 YH |
53 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
54 | Note that the changes are semaphored via rtnl_lock. | |
55 | */ | |
56 | ||
57 | static DEFINE_RWLOCK(mrt_lock); | |
58 | ||
59 | /* | |
60 | * Multicast router control variables | |
61 | */ | |
62 | ||
4e16880c | 63 | #define MIF_EXISTS(_net, _idx) ((_net)->ipv6.vif6_table[_idx].dev != NULL) |
7bc570c8 | 64 | |
7bc570c8 | 65 | static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
7bc570c8 YH |
66 | |
67 | /* Special spinlock for queue of unresolved entries */ | |
68 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
69 | ||
70 | /* We return to original Alan's scheme. Hash table of resolved | |
71 | entries is changed only in process context and protected | |
72 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
73 | with strong spinlock mfc_unres_lock. | |
74 | ||
75 | In this case data path is free of exclusive locks at all. | |
76 | */ | |
77 | ||
78 | static struct kmem_cache *mrt_cachep __read_mostly; | |
79 | ||
80 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache); | |
8229efda BT |
81 | static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, |
82 | mifi_t mifi, int assert); | |
7bc570c8 | 83 | static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm); |
8229efda | 84 | static void mroute_clean_tables(struct net *net); |
7bc570c8 | 85 | |
14fb64e1 YH |
86 | #ifdef CONFIG_IPV6_PIMSM_V2 |
87 | static struct inet6_protocol pim6_protocol; | |
88 | #endif | |
89 | ||
7bc570c8 YH |
90 | static struct timer_list ipmr_expire_timer; |
91 | ||
92 | ||
93 | #ifdef CONFIG_PROC_FS | |
94 | ||
95 | struct ipmr_mfc_iter { | |
8b90fc7e | 96 | struct seq_net_private p; |
7bc570c8 YH |
97 | struct mfc6_cache **cache; |
98 | int ct; | |
99 | }; | |
100 | ||
101 | ||
8b90fc7e BT |
102 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
103 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 YH |
104 | { |
105 | struct mfc6_cache *mfc; | |
106 | ||
8b90fc7e | 107 | it->cache = net->ipv6.mfc6_cache_array; |
7bc570c8 | 108 | read_lock(&mrt_lock); |
4a6258a0 | 109 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) |
8b90fc7e | 110 | for (mfc = net->ipv6.mfc6_cache_array[it->ct]; |
4a6258a0 | 111 | mfc; mfc = mfc->next) |
7bc570c8 YH |
112 | if (pos-- == 0) |
113 | return mfc; | |
114 | read_unlock(&mrt_lock); | |
115 | ||
116 | it->cache = &mfc_unres_queue; | |
117 | spin_lock_bh(&mfc_unres_lock); | |
118 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) | |
8b90fc7e BT |
119 | if (net_eq(mfc6_net(mfc), net) && |
120 | pos-- == 0) | |
7bc570c8 YH |
121 | return mfc; |
122 | spin_unlock_bh(&mfc_unres_lock); | |
123 | ||
124 | it->cache = NULL; | |
125 | return NULL; | |
126 | } | |
127 | ||
128 | ||
129 | ||
130 | ||
131 | /* | |
132 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
133 | */ | |
134 | ||
135 | struct ipmr_vif_iter { | |
8b90fc7e | 136 | struct seq_net_private p; |
7bc570c8 YH |
137 | int ct; |
138 | }; | |
139 | ||
8b90fc7e BT |
140 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
141 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
142 | loff_t pos) |
143 | { | |
8b90fc7e BT |
144 | for (iter->ct = 0; iter->ct < net->ipv6.maxvif; ++iter->ct) { |
145 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 YH |
146 | continue; |
147 | if (pos-- == 0) | |
8b90fc7e | 148 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
149 | } |
150 | return NULL; | |
151 | } | |
152 | ||
153 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
154 | __acquires(mrt_lock) | |
155 | { | |
8b90fc7e BT |
156 | struct net *net = seq_file_net(seq); |
157 | ||
7bc570c8 | 158 | read_lock(&mrt_lock); |
8b90fc7e BT |
159 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
160 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
161 | } |
162 | ||
163 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
164 | { | |
165 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 166 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
167 | |
168 | ++*pos; | |
169 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 170 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 171 | |
8b90fc7e BT |
172 | while (++iter->ct < net->ipv6.maxvif) { |
173 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 | 174 | continue; |
8b90fc7e | 175 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
176 | } |
177 | return NULL; | |
178 | } | |
179 | ||
180 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
181 | __releases(mrt_lock) | |
182 | { | |
183 | read_unlock(&mrt_lock); | |
184 | } | |
185 | ||
186 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
187 | { | |
8b90fc7e BT |
188 | struct net *net = seq_file_net(seq); |
189 | ||
7bc570c8 YH |
190 | if (v == SEQ_START_TOKEN) { |
191 | seq_puts(seq, | |
192 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
193 | } else { | |
194 | const struct mif_device *vif = v; | |
195 | const char *name = vif->dev ? vif->dev->name : "none"; | |
196 | ||
197 | seq_printf(seq, | |
d430a227 | 198 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
8b90fc7e | 199 | vif - net->ipv6.vif6_table, |
7bc570c8 YH |
200 | name, vif->bytes_in, vif->pkt_in, |
201 | vif->bytes_out, vif->pkt_out, | |
202 | vif->flags); | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
98147d52 | 207 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
208 | .start = ip6mr_vif_seq_start, |
209 | .next = ip6mr_vif_seq_next, | |
210 | .stop = ip6mr_vif_seq_stop, | |
211 | .show = ip6mr_vif_seq_show, | |
212 | }; | |
213 | ||
214 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
215 | { | |
8b90fc7e BT |
216 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
217 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
218 | } |
219 | ||
5ca1b998 | 220 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
221 | .owner = THIS_MODULE, |
222 | .open = ip6mr_vif_open, | |
223 | .read = seq_read, | |
224 | .llseek = seq_lseek, | |
8b90fc7e | 225 | .release = seq_release_net, |
7bc570c8 YH |
226 | }; |
227 | ||
228 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
229 | { | |
8b90fc7e BT |
230 | struct net *net = seq_file_net(seq); |
231 | ||
232 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) | |
233 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
234 | } |
235 | ||
236 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
237 | { | |
238 | struct mfc6_cache *mfc = v; | |
239 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 240 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
241 | |
242 | ++*pos; | |
243 | ||
244 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 245 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 YH |
246 | |
247 | if (mfc->next) | |
248 | return mfc->next; | |
249 | ||
250 | if (it->cache == &mfc_unres_queue) | |
251 | goto end_of_list; | |
252 | ||
8b90fc7e | 253 | BUG_ON(it->cache != net->ipv6.mfc6_cache_array); |
7bc570c8 | 254 | |
4a6258a0 | 255 | while (++it->ct < MFC6_LINES) { |
8b90fc7e | 256 | mfc = net->ipv6.mfc6_cache_array[it->ct]; |
7bc570c8 YH |
257 | if (mfc) |
258 | return mfc; | |
259 | } | |
260 | ||
261 | /* exhausted cache_array, show unresolved */ | |
262 | read_unlock(&mrt_lock); | |
263 | it->cache = &mfc_unres_queue; | |
264 | it->ct = 0; | |
265 | ||
266 | spin_lock_bh(&mfc_unres_lock); | |
267 | mfc = mfc_unres_queue; | |
268 | if (mfc) | |
269 | return mfc; | |
270 | ||
271 | end_of_list: | |
272 | spin_unlock_bh(&mfc_unres_lock); | |
273 | it->cache = NULL; | |
274 | ||
275 | return NULL; | |
276 | } | |
277 | ||
278 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
279 | { | |
280 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 281 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
282 | |
283 | if (it->cache == &mfc_unres_queue) | |
284 | spin_unlock_bh(&mfc_unres_lock); | |
8b90fc7e | 285 | else if (it->cache == net->ipv6.mfc6_cache_array) |
7bc570c8 YH |
286 | read_unlock(&mrt_lock); |
287 | } | |
288 | ||
289 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
290 | { | |
291 | int n; | |
8b90fc7e | 292 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
293 | |
294 | if (v == SEQ_START_TOKEN) { | |
295 | seq_puts(seq, | |
296 | "Group " | |
297 | "Origin " | |
298 | "Iif Pkts Bytes Wrong Oifs\n"); | |
299 | } else { | |
300 | const struct mfc6_cache *mfc = v; | |
301 | const struct ipmr_mfc_iter *it = seq->private; | |
302 | ||
999890b2 | 303 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 304 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 305 | mfc->mf6c_parent); |
7bc570c8 YH |
306 | |
307 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
308 | seq_printf(seq, " %8lu %8lu %8lu", |
309 | mfc->mfc_un.res.pkt, | |
310 | mfc->mfc_un.res.bytes, | |
311 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
312 | for (n = mfc->mfc_un.res.minvif; |
313 | n < mfc->mfc_un.res.maxvif; n++) { | |
8b90fc7e | 314 | if (MIF_EXISTS(net, n) && |
7bc570c8 YH |
315 | mfc->mfc_un.res.ttls[n] < 255) |
316 | seq_printf(seq, | |
317 | " %2d:%-3d", | |
318 | n, mfc->mfc_un.res.ttls[n]); | |
319 | } | |
1ea472e2 BT |
320 | } else { |
321 | /* unresolved mfc_caches don't contain | |
322 | * pkt, bytes and wrong_if values | |
323 | */ | |
324 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
325 | } |
326 | seq_putc(seq, '\n'); | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static struct seq_operations ipmr_mfc_seq_ops = { | |
332 | .start = ipmr_mfc_seq_start, | |
333 | .next = ipmr_mfc_seq_next, | |
334 | .stop = ipmr_mfc_seq_stop, | |
335 | .show = ipmr_mfc_seq_show, | |
336 | }; | |
337 | ||
338 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
339 | { | |
8b90fc7e BT |
340 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
341 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
342 | } |
343 | ||
5ca1b998 | 344 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
345 | .owner = THIS_MODULE, |
346 | .open = ipmr_mfc_open, | |
347 | .read = seq_read, | |
348 | .llseek = seq_lseek, | |
8b90fc7e | 349 | .release = seq_release_net, |
7bc570c8 YH |
350 | }; |
351 | #endif | |
352 | ||
14fb64e1 | 353 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
354 | |
355 | static int pim6_rcv(struct sk_buff *skb) | |
356 | { | |
357 | struct pimreghdr *pim; | |
358 | struct ipv6hdr *encap; | |
359 | struct net_device *reg_dev = NULL; | |
8229efda BT |
360 | struct net *net = dev_net(skb->dev); |
361 | int reg_vif_num = net->ipv6.mroute_reg_vif_num; | |
14fb64e1 YH |
362 | |
363 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
364 | goto drop; | |
365 | ||
366 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
367 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
368 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
369 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
370 | sizeof(*pim), IPPROTO_PIM, | |
371 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 372 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
373 | goto drop; |
374 | ||
375 | /* check if the inner packet is destined to mcast group */ | |
376 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
377 | sizeof(*pim)); | |
378 | ||
379 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
380 | encap->payload_len == 0 || | |
381 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
382 | goto drop; | |
383 | ||
384 | read_lock(&mrt_lock); | |
385 | if (reg_vif_num >= 0) | |
8229efda | 386 | reg_dev = net->ipv6.vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
387 | if (reg_dev) |
388 | dev_hold(reg_dev); | |
389 | read_unlock(&mrt_lock); | |
390 | ||
391 | if (reg_dev == NULL) | |
392 | goto drop; | |
393 | ||
394 | skb->mac_header = skb->network_header; | |
395 | skb_pull(skb, (u8 *)encap - skb->data); | |
396 | skb_reset_network_header(skb); | |
397 | skb->dev = reg_dev; | |
1d6e55f1 | 398 | skb->protocol = htons(ETH_P_IPV6); |
14fb64e1 YH |
399 | skb->ip_summed = 0; |
400 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 401 | skb_dst_drop(skb); |
dc58c78c PE |
402 | reg_dev->stats.rx_bytes += skb->len; |
403 | reg_dev->stats.rx_packets++; | |
14fb64e1 YH |
404 | nf_reset(skb); |
405 | netif_rx(skb); | |
406 | dev_put(reg_dev); | |
407 | return 0; | |
408 | drop: | |
409 | kfree_skb(skb); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static struct inet6_protocol pim6_protocol = { | |
414 | .handler = pim6_rcv, | |
415 | }; | |
416 | ||
417 | /* Service routines creating virtual interfaces: PIMREG */ | |
418 | ||
6fef4c0c SH |
419 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
420 | struct net_device *dev) | |
14fb64e1 | 421 | { |
8229efda BT |
422 | struct net *net = dev_net(dev); |
423 | ||
14fb64e1 | 424 | read_lock(&mrt_lock); |
dc58c78c PE |
425 | dev->stats.tx_bytes += skb->len; |
426 | dev->stats.tx_packets++; | |
8229efda BT |
427 | ip6mr_cache_report(net, skb, net->ipv6.mroute_reg_vif_num, |
428 | MRT6MSG_WHOLEPKT); | |
14fb64e1 YH |
429 | read_unlock(&mrt_lock); |
430 | kfree_skb(skb); | |
6ed10654 | 431 | return NETDEV_TX_OK; |
14fb64e1 YH |
432 | } |
433 | ||
007c3838 SH |
434 | static const struct net_device_ops reg_vif_netdev_ops = { |
435 | .ndo_start_xmit = reg_vif_xmit, | |
436 | }; | |
437 | ||
14fb64e1 YH |
438 | static void reg_vif_setup(struct net_device *dev) |
439 | { | |
440 | dev->type = ARPHRD_PIMREG; | |
441 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
442 | dev->flags = IFF_NOARP; | |
007c3838 | 443 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 444 | dev->destructor = free_netdev; |
403dbb97 | 445 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
446 | } |
447 | ||
8229efda | 448 | static struct net_device *ip6mr_reg_vif(struct net *net) |
14fb64e1 YH |
449 | { |
450 | struct net_device *dev; | |
14fb64e1 | 451 | |
dc58c78c | 452 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
14fb64e1 YH |
453 | if (dev == NULL) |
454 | return NULL; | |
455 | ||
8229efda BT |
456 | dev_net_set(dev, net); |
457 | ||
14fb64e1 YH |
458 | if (register_netdevice(dev)) { |
459 | free_netdev(dev); | |
460 | return NULL; | |
461 | } | |
462 | dev->iflink = 0; | |
463 | ||
14fb64e1 YH |
464 | if (dev_open(dev)) |
465 | goto failure; | |
466 | ||
7af3db78 | 467 | dev_hold(dev); |
14fb64e1 YH |
468 | return dev; |
469 | ||
470 | failure: | |
471 | /* allow the register to be completed before unregistering. */ | |
472 | rtnl_unlock(); | |
473 | rtnl_lock(); | |
474 | ||
475 | unregister_netdevice(dev); | |
476 | return NULL; | |
477 | } | |
478 | #endif | |
479 | ||
7bc570c8 YH |
480 | /* |
481 | * Delete a VIF entry | |
482 | */ | |
483 | ||
8229efda | 484 | static int mif6_delete(struct net *net, int vifi) |
7bc570c8 YH |
485 | { |
486 | struct mif_device *v; | |
487 | struct net_device *dev; | |
1d6e55f1 | 488 | struct inet6_dev *in6_dev; |
8229efda | 489 | if (vifi < 0 || vifi >= net->ipv6.maxvif) |
7bc570c8 YH |
490 | return -EADDRNOTAVAIL; |
491 | ||
8229efda | 492 | v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 YH |
493 | |
494 | write_lock_bh(&mrt_lock); | |
495 | dev = v->dev; | |
496 | v->dev = NULL; | |
497 | ||
498 | if (!dev) { | |
499 | write_unlock_bh(&mrt_lock); | |
500 | return -EADDRNOTAVAIL; | |
501 | } | |
502 | ||
14fb64e1 | 503 | #ifdef CONFIG_IPV6_PIMSM_V2 |
8229efda BT |
504 | if (vifi == net->ipv6.mroute_reg_vif_num) |
505 | net->ipv6.mroute_reg_vif_num = -1; | |
14fb64e1 YH |
506 | #endif |
507 | ||
8229efda | 508 | if (vifi + 1 == net->ipv6.maxvif) { |
7bc570c8 YH |
509 | int tmp; |
510 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
8229efda | 511 | if (MIF_EXISTS(net, tmp)) |
7bc570c8 YH |
512 | break; |
513 | } | |
8229efda | 514 | net->ipv6.maxvif = tmp + 1; |
7bc570c8 YH |
515 | } |
516 | ||
517 | write_unlock_bh(&mrt_lock); | |
518 | ||
519 | dev_set_allmulti(dev, -1); | |
520 | ||
1d6e55f1 TG |
521 | in6_dev = __in6_dev_get(dev); |
522 | if (in6_dev) | |
523 | in6_dev->cnf.mc_forwarding--; | |
524 | ||
7bc570c8 YH |
525 | if (v->flags & MIFF_REGISTER) |
526 | unregister_netdevice(dev); | |
527 | ||
528 | dev_put(dev); | |
529 | return 0; | |
530 | } | |
531 | ||
58701ad4 BT |
532 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
533 | { | |
534 | release_net(mfc6_net(c)); | |
535 | kmem_cache_free(mrt_cachep, c); | |
536 | } | |
537 | ||
7bc570c8 YH |
538 | /* Destroy an unresolved cache entry, killing queued skbs |
539 | and reporting error to netlink readers. | |
540 | */ | |
541 | ||
542 | static void ip6mr_destroy_unres(struct mfc6_cache *c) | |
543 | { | |
544 | struct sk_buff *skb; | |
8229efda | 545 | struct net *net = mfc6_net(c); |
7bc570c8 | 546 | |
8229efda | 547 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
548 | |
549 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
550 | if (ipv6_hdr(skb)->version == 0) { | |
551 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
552 | nlh->nlmsg_type = NLMSG_ERROR; | |
553 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
554 | skb_trim(skb, nlh->nlmsg_len); | |
555 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 556 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
557 | } else |
558 | kfree_skb(skb); | |
559 | } | |
560 | ||
58701ad4 | 561 | ip6mr_cache_free(c); |
7bc570c8 YH |
562 | } |
563 | ||
564 | ||
565 | /* Single timer process for all the unresolved queue. */ | |
566 | ||
567 | static void ipmr_do_expire_process(unsigned long dummy) | |
568 | { | |
569 | unsigned long now = jiffies; | |
570 | unsigned long expires = 10 * HZ; | |
571 | struct mfc6_cache *c, **cp; | |
572 | ||
573 | cp = &mfc_unres_queue; | |
574 | ||
575 | while ((c = *cp) != NULL) { | |
576 | if (time_after(c->mfc_un.unres.expires, now)) { | |
577 | /* not yet... */ | |
578 | unsigned long interval = c->mfc_un.unres.expires - now; | |
579 | if (interval < expires) | |
580 | expires = interval; | |
581 | cp = &c->next; | |
582 | continue; | |
583 | } | |
584 | ||
585 | *cp = c->next; | |
586 | ip6mr_destroy_unres(c); | |
587 | } | |
588 | ||
4045e57c | 589 | if (mfc_unres_queue != NULL) |
7bc570c8 YH |
590 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
591 | } | |
592 | ||
593 | static void ipmr_expire_process(unsigned long dummy) | |
594 | { | |
595 | if (!spin_trylock(&mfc_unres_lock)) { | |
596 | mod_timer(&ipmr_expire_timer, jiffies + 1); | |
597 | return; | |
598 | } | |
599 | ||
4045e57c | 600 | if (mfc_unres_queue != NULL) |
7bc570c8 YH |
601 | ipmr_do_expire_process(dummy); |
602 | ||
603 | spin_unlock(&mfc_unres_lock); | |
604 | } | |
605 | ||
606 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
607 | ||
608 | static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls) | |
609 | { | |
610 | int vifi; | |
8229efda | 611 | struct net *net = mfc6_net(cache); |
7bc570c8 | 612 | |
6ac7eb08 | 613 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 614 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 615 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 616 | |
8229efda BT |
617 | for (vifi = 0; vifi < net->ipv6.maxvif; vifi++) { |
618 | if (MIF_EXISTS(net, vifi) && | |
4e16880c | 619 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
620 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
621 | if (cache->mfc_un.res.minvif > vifi) | |
622 | cache->mfc_un.res.minvif = vifi; | |
623 | if (cache->mfc_un.res.maxvif <= vifi) | |
624 | cache->mfc_un.res.maxvif = vifi + 1; | |
625 | } | |
626 | } | |
627 | } | |
628 | ||
8229efda | 629 | static int mif6_add(struct net *net, struct mif6ctl *vifc, int mrtsock) |
7bc570c8 YH |
630 | { |
631 | int vifi = vifc->mif6c_mifi; | |
8229efda | 632 | struct mif_device *v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 | 633 | struct net_device *dev; |
1d6e55f1 | 634 | struct inet6_dev *in6_dev; |
5ae7b444 | 635 | int err; |
7bc570c8 YH |
636 | |
637 | /* Is vif busy ? */ | |
8229efda | 638 | if (MIF_EXISTS(net, vifi)) |
7bc570c8 YH |
639 | return -EADDRINUSE; |
640 | ||
641 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
642 | #ifdef CONFIG_IPV6_PIMSM_V2 |
643 | case MIFF_REGISTER: | |
644 | /* | |
645 | * Special Purpose VIF in PIM | |
646 | * All the packets will be sent to the daemon | |
647 | */ | |
8229efda | 648 | if (net->ipv6.mroute_reg_vif_num >= 0) |
14fb64e1 | 649 | return -EADDRINUSE; |
8229efda | 650 | dev = ip6mr_reg_vif(net); |
14fb64e1 YH |
651 | if (!dev) |
652 | return -ENOBUFS; | |
5ae7b444 WC |
653 | err = dev_set_allmulti(dev, 1); |
654 | if (err) { | |
655 | unregister_netdevice(dev); | |
7af3db78 | 656 | dev_put(dev); |
5ae7b444 WC |
657 | return err; |
658 | } | |
14fb64e1 YH |
659 | break; |
660 | #endif | |
7bc570c8 | 661 | case 0: |
8229efda | 662 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
663 | if (!dev) |
664 | return -EADDRNOTAVAIL; | |
5ae7b444 | 665 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
666 | if (err) { |
667 | dev_put(dev); | |
5ae7b444 | 668 | return err; |
7af3db78 | 669 | } |
7bc570c8 YH |
670 | break; |
671 | default: | |
672 | return -EINVAL; | |
673 | } | |
674 | ||
1d6e55f1 TG |
675 | in6_dev = __in6_dev_get(dev); |
676 | if (in6_dev) | |
677 | in6_dev->cnf.mc_forwarding++; | |
678 | ||
7bc570c8 YH |
679 | /* |
680 | * Fill in the VIF structures | |
681 | */ | |
682 | v->rate_limit = vifc->vifc_rate_limit; | |
683 | v->flags = vifc->mif6c_flags; | |
684 | if (!mrtsock) | |
685 | v->flags |= VIFF_STATIC; | |
686 | v->threshold = vifc->vifc_threshold; | |
687 | v->bytes_in = 0; | |
688 | v->bytes_out = 0; | |
689 | v->pkt_in = 0; | |
690 | v->pkt_out = 0; | |
691 | v->link = dev->ifindex; | |
692 | if (v->flags & MIFF_REGISTER) | |
693 | v->link = dev->iflink; | |
694 | ||
695 | /* And finish update writing critical data */ | |
696 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 697 | v->dev = dev; |
14fb64e1 YH |
698 | #ifdef CONFIG_IPV6_PIMSM_V2 |
699 | if (v->flags & MIFF_REGISTER) | |
8229efda | 700 | net->ipv6.mroute_reg_vif_num = vifi; |
14fb64e1 | 701 | #endif |
8229efda BT |
702 | if (vifi + 1 > net->ipv6.maxvif) |
703 | net->ipv6.maxvif = vifi + 1; | |
7bc570c8 YH |
704 | write_unlock_bh(&mrt_lock); |
705 | return 0; | |
706 | } | |
707 | ||
8229efda BT |
708 | static struct mfc6_cache *ip6mr_cache_find(struct net *net, |
709 | struct in6_addr *origin, | |
710 | struct in6_addr *mcastgrp) | |
7bc570c8 YH |
711 | { |
712 | int line = MFC6_HASH(mcastgrp, origin); | |
713 | struct mfc6_cache *c; | |
714 | ||
8229efda | 715 | for (c = net->ipv6.mfc6_cache_array[line]; c; c = c->next) { |
7bc570c8 YH |
716 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
717 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
718 | break; | |
719 | } | |
720 | return c; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Allocate a multicast cache entry | |
725 | */ | |
58701ad4 | 726 | static struct mfc6_cache *ip6mr_cache_alloc(struct net *net) |
7bc570c8 | 727 | { |
36cbac59 | 728 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
729 | if (c == NULL) |
730 | return NULL; | |
6ac7eb08 | 731 | c->mfc_un.res.minvif = MAXMIFS; |
58701ad4 | 732 | mfc6_net_set(c, net); |
7bc570c8 YH |
733 | return c; |
734 | } | |
735 | ||
58701ad4 | 736 | static struct mfc6_cache *ip6mr_cache_alloc_unres(struct net *net) |
7bc570c8 | 737 | { |
36cbac59 | 738 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
739 | if (c == NULL) |
740 | return NULL; | |
7bc570c8 YH |
741 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
742 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
58701ad4 | 743 | mfc6_net_set(c, net); |
7bc570c8 YH |
744 | return c; |
745 | } | |
746 | ||
747 | /* | |
748 | * A cache entry has gone into a resolved state from queued | |
749 | */ | |
750 | ||
751 | static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c) | |
752 | { | |
753 | struct sk_buff *skb; | |
754 | ||
755 | /* | |
756 | * Play the pending entries through our router | |
757 | */ | |
758 | ||
759 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
760 | if (ipv6_hdr(skb)->version == 0) { | |
761 | int err; | |
762 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
763 | ||
764 | if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
549e028d | 765 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
766 | } else { |
767 | nlh->nlmsg_type = NLMSG_ERROR; | |
768 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
769 | skb_trim(skb, nlh->nlmsg_len); | |
770 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
771 | } | |
8229efda | 772 | err = rtnl_unicast(skb, mfc6_net(uc), NETLINK_CB(skb).pid); |
7bc570c8 YH |
773 | } else |
774 | ip6_mr_forward(skb, c); | |
775 | } | |
776 | } | |
777 | ||
778 | /* | |
779 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
780 | * expects the following bizarre scheme. | |
781 | * | |
782 | * Called under mrt_lock. | |
783 | */ | |
784 | ||
8229efda BT |
785 | static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, mifi_t mifi, |
786 | int assert) | |
7bc570c8 YH |
787 | { |
788 | struct sk_buff *skb; | |
789 | struct mrt6msg *msg; | |
790 | int ret; | |
791 | ||
14fb64e1 YH |
792 | #ifdef CONFIG_IPV6_PIMSM_V2 |
793 | if (assert == MRT6MSG_WHOLEPKT) | |
794 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
795 | +sizeof(*msg)); | |
796 | else | |
797 | #endif | |
798 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
799 | |
800 | if (!skb) | |
801 | return -ENOBUFS; | |
802 | ||
803 | /* I suppose that internal messages | |
804 | * do not require checksums */ | |
805 | ||
806 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
807 | ||
14fb64e1 YH |
808 | #ifdef CONFIG_IPV6_PIMSM_V2 |
809 | if (assert == MRT6MSG_WHOLEPKT) { | |
810 | /* Ugly, but we have no choice with this interface. | |
811 | Duplicate old header, fix length etc. | |
812 | And all this only to mangle msg->im6_msgtype and | |
813 | to set msg->im6_mbz to "mbz" :-) | |
814 | */ | |
815 | skb_push(skb, -skb_network_offset(pkt)); | |
816 | ||
817 | skb_push(skb, sizeof(*msg)); | |
818 | skb_reset_transport_header(skb); | |
819 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
820 | msg->im6_mbz = 0; | |
821 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
8229efda | 822 | msg->im6_mif = net->ipv6.mroute_reg_vif_num; |
14fb64e1 YH |
823 | msg->im6_pad = 0; |
824 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
825 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
826 | ||
827 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
828 | } else | |
829 | #endif | |
830 | { | |
7bc570c8 YH |
831 | /* |
832 | * Copy the IP header | |
833 | */ | |
834 | ||
835 | skb_put(skb, sizeof(struct ipv6hdr)); | |
836 | skb_reset_network_header(skb); | |
837 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
838 | ||
839 | /* | |
840 | * Add our header | |
841 | */ | |
842 | skb_put(skb, sizeof(*msg)); | |
843 | skb_reset_transport_header(skb); | |
844 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
845 | ||
846 | msg->im6_mbz = 0; | |
847 | msg->im6_msgtype = assert; | |
6ac7eb08 | 848 | msg->im6_mif = mifi; |
7bc570c8 YH |
849 | msg->im6_pad = 0; |
850 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
851 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
852 | ||
adf30907 | 853 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 854 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 855 | } |
7bc570c8 | 856 | |
8229efda | 857 | if (net->ipv6.mroute6_sk == NULL) { |
7bc570c8 YH |
858 | kfree_skb(skb); |
859 | return -EINVAL; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Deliver to user space multicast routing algorithms | |
864 | */ | |
8229efda | 865 | ret = sock_queue_rcv_skb(net->ipv6.mroute6_sk, skb); |
bd91b8bf | 866 | if (ret < 0) { |
7bc570c8 YH |
867 | if (net_ratelimit()) |
868 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
869 | kfree_skb(skb); | |
870 | } | |
871 | ||
872 | return ret; | |
873 | } | |
874 | ||
875 | /* | |
876 | * Queue a packet for resolution. It gets locked cache entry! | |
877 | */ | |
878 | ||
879 | static int | |
8229efda | 880 | ip6mr_cache_unresolved(struct net *net, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 YH |
881 | { |
882 | int err; | |
883 | struct mfc6_cache *c; | |
884 | ||
885 | spin_lock_bh(&mfc_unres_lock); | |
886 | for (c = mfc_unres_queue; c; c = c->next) { | |
8229efda | 887 | if (net_eq(mfc6_net(c), net) && |
4045e57c | 888 | ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
7bc570c8 YH |
889 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) |
890 | break; | |
891 | } | |
892 | ||
893 | if (c == NULL) { | |
894 | /* | |
895 | * Create a new entry if allowable | |
896 | */ | |
897 | ||
8229efda BT |
898 | if (atomic_read(&net->ipv6.cache_resolve_queue_len) >= 10 || |
899 | (c = ip6mr_cache_alloc_unres(net)) == NULL) { | |
7bc570c8 YH |
900 | spin_unlock_bh(&mfc_unres_lock); |
901 | ||
902 | kfree_skb(skb); | |
903 | return -ENOBUFS; | |
904 | } | |
905 | ||
906 | /* | |
907 | * Fill in the new cache entry | |
908 | */ | |
909 | c->mf6c_parent = -1; | |
910 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
911 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
912 | ||
913 | /* | |
914 | * Reflect first query at pim6sd | |
915 | */ | |
8229efda BT |
916 | err = ip6mr_cache_report(net, skb, mifi, MRT6MSG_NOCACHE); |
917 | if (err < 0) { | |
7bc570c8 YH |
918 | /* If the report failed throw the cache entry |
919 | out - Brad Parker | |
920 | */ | |
921 | spin_unlock_bh(&mfc_unres_lock); | |
922 | ||
58701ad4 | 923 | ip6mr_cache_free(c); |
7bc570c8 YH |
924 | kfree_skb(skb); |
925 | return err; | |
926 | } | |
927 | ||
8229efda | 928 | atomic_inc(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
929 | c->next = mfc_unres_queue; |
930 | mfc_unres_queue = c; | |
931 | ||
932 | ipmr_do_expire_process(1); | |
933 | } | |
934 | ||
935 | /* | |
936 | * See if we can append the packet | |
937 | */ | |
938 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
939 | kfree_skb(skb); | |
940 | err = -ENOBUFS; | |
941 | } else { | |
942 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
943 | err = 0; | |
944 | } | |
945 | ||
946 | spin_unlock_bh(&mfc_unres_lock); | |
947 | return err; | |
948 | } | |
949 | ||
950 | /* | |
951 | * MFC6 cache manipulation by user space | |
952 | */ | |
953 | ||
8229efda | 954 | static int ip6mr_mfc_delete(struct net *net, struct mf6cctl *mfc) |
7bc570c8 YH |
955 | { |
956 | int line; | |
957 | struct mfc6_cache *c, **cp; | |
958 | ||
959 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
960 | ||
8229efda | 961 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 962 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
963 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
964 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
965 | write_lock_bh(&mrt_lock); | |
966 | *cp = c->next; | |
967 | write_unlock_bh(&mrt_lock); | |
968 | ||
58701ad4 | 969 | ip6mr_cache_free(c); |
7bc570c8 YH |
970 | return 0; |
971 | } | |
972 | } | |
973 | return -ENOENT; | |
974 | } | |
975 | ||
976 | static int ip6mr_device_event(struct notifier_block *this, | |
977 | unsigned long event, void *ptr) | |
978 | { | |
979 | struct net_device *dev = ptr; | |
8229efda | 980 | struct net *net = dev_net(dev); |
7bc570c8 YH |
981 | struct mif_device *v; |
982 | int ct; | |
983 | ||
7bc570c8 YH |
984 | if (event != NETDEV_UNREGISTER) |
985 | return NOTIFY_DONE; | |
986 | ||
8229efda BT |
987 | v = &net->ipv6.vif6_table[0]; |
988 | for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) { | |
7bc570c8 | 989 | if (v->dev == dev) |
8229efda | 990 | mif6_delete(net, ct); |
7bc570c8 YH |
991 | } |
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 | ||
6ac7eb08 RR |
1117 | memset(ttls, 255, MAXMIFS); |
1118 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1119 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1120 | ttls[i] = 1; | |
1121 | ||
1122 | } | |
1123 | ||
1124 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1125 | ||
8229efda | 1126 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 1127 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
1128 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1129 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) | |
1130 | break; | |
1131 | } | |
1132 | ||
1133 | if (c != NULL) { | |
1134 | write_lock_bh(&mrt_lock); | |
1135 | c->mf6c_parent = mfc->mf6cc_parent; | |
1136 | ip6mr_update_thresholds(c, ttls); | |
1137 | if (!mrtsock) | |
1138 | c->mfc_flags |= MFC_STATIC; | |
1139 | write_unlock_bh(&mrt_lock); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1144 | return -EINVAL; | |
1145 | ||
8229efda | 1146 | c = ip6mr_cache_alloc(net); |
7bc570c8 YH |
1147 | if (c == NULL) |
1148 | return -ENOMEM; | |
1149 | ||
1150 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1151 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1152 | c->mf6c_parent = mfc->mf6cc_parent; | |
1153 | ip6mr_update_thresholds(c, ttls); | |
1154 | if (!mrtsock) | |
1155 | c->mfc_flags |= MFC_STATIC; | |
1156 | ||
1157 | write_lock_bh(&mrt_lock); | |
8229efda BT |
1158 | c->next = net->ipv6.mfc6_cache_array[line]; |
1159 | net->ipv6.mfc6_cache_array[line] = c; | |
7bc570c8 YH |
1160 | write_unlock_bh(&mrt_lock); |
1161 | ||
1162 | /* | |
1163 | * Check to see if we resolved a queued list. If so we | |
1164 | * need to send on the frames and tidy up. | |
1165 | */ | |
1166 | spin_lock_bh(&mfc_unres_lock); | |
1167 | for (cp = &mfc_unres_queue; (uc = *cp) != NULL; | |
1168 | cp = &uc->next) { | |
8229efda | 1169 | if (net_eq(mfc6_net(uc), net) && |
4045e57c | 1170 | ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 YH |
1171 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
1172 | *cp = uc->next; | |
8229efda | 1173 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
1174 | break; |
1175 | } | |
1176 | } | |
4045e57c BT |
1177 | if (mfc_unres_queue == NULL) |
1178 | del_timer(&ipmr_expire_timer); | |
7bc570c8 YH |
1179 | spin_unlock_bh(&mfc_unres_lock); |
1180 | ||
1181 | if (uc) { | |
1182 | ip6mr_cache_resolve(uc, c); | |
58701ad4 | 1183 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1184 | } |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * Close the multicast socket, and clear the vif tables etc | |
1190 | */ | |
1191 | ||
8229efda | 1192 | static void mroute_clean_tables(struct net *net) |
7bc570c8 YH |
1193 | { |
1194 | int i; | |
1195 | ||
1196 | /* | |
1197 | * Shut down all active vif entries | |
1198 | */ | |
8229efda BT |
1199 | for (i = 0; i < net->ipv6.maxvif; i++) { |
1200 | if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC)) | |
1201 | mif6_delete(net, i); | |
7bc570c8 YH |
1202 | } |
1203 | ||
1204 | /* | |
1205 | * Wipe the cache | |
1206 | */ | |
4a6258a0 | 1207 | for (i = 0; i < MFC6_LINES; i++) { |
7bc570c8 YH |
1208 | struct mfc6_cache *c, **cp; |
1209 | ||
8229efda | 1210 | cp = &net->ipv6.mfc6_cache_array[i]; |
7bc570c8 YH |
1211 | while ((c = *cp) != NULL) { |
1212 | if (c->mfc_flags & MFC_STATIC) { | |
1213 | cp = &c->next; | |
1214 | continue; | |
1215 | } | |
1216 | write_lock_bh(&mrt_lock); | |
1217 | *cp = c->next; | |
1218 | write_unlock_bh(&mrt_lock); | |
1219 | ||
58701ad4 | 1220 | ip6mr_cache_free(c); |
7bc570c8 YH |
1221 | } |
1222 | } | |
1223 | ||
8229efda | 1224 | if (atomic_read(&net->ipv6.cache_resolve_queue_len) != 0) { |
4045e57c | 1225 | struct mfc6_cache *c, **cp; |
7bc570c8 YH |
1226 | |
1227 | spin_lock_bh(&mfc_unres_lock); | |
4045e57c BT |
1228 | cp = &mfc_unres_queue; |
1229 | while ((c = *cp) != NULL) { | |
8229efda | 1230 | if (!net_eq(mfc6_net(c), net)) { |
4045e57c BT |
1231 | cp = &c->next; |
1232 | continue; | |
1233 | } | |
1234 | *cp = c->next; | |
7bc570c8 | 1235 | ip6mr_destroy_unres(c); |
7bc570c8 YH |
1236 | } |
1237 | spin_unlock_bh(&mfc_unres_lock); | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | static int ip6mr_sk_init(struct sock *sk) | |
1242 | { | |
1243 | int err = 0; | |
8229efda | 1244 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1245 | |
1246 | rtnl_lock(); | |
1247 | write_lock_bh(&mrt_lock); | |
1d6e55f1 | 1248 | if (likely(net->ipv6.mroute6_sk == NULL)) { |
8229efda | 1249 | net->ipv6.mroute6_sk = sk; |
1d6e55f1 TG |
1250 | net->ipv6.devconf_all->mc_forwarding++; |
1251 | } | |
7bc570c8 YH |
1252 | else |
1253 | err = -EADDRINUSE; | |
1254 | write_unlock_bh(&mrt_lock); | |
1255 | ||
1256 | rtnl_unlock(); | |
1257 | ||
1258 | return err; | |
1259 | } | |
1260 | ||
1261 | int ip6mr_sk_done(struct sock *sk) | |
1262 | { | |
1263 | int err = 0; | |
8229efda | 1264 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1265 | |
1266 | rtnl_lock(); | |
8229efda | 1267 | if (sk == net->ipv6.mroute6_sk) { |
7bc570c8 | 1268 | write_lock_bh(&mrt_lock); |
8229efda | 1269 | net->ipv6.mroute6_sk = NULL; |
1d6e55f1 | 1270 | net->ipv6.devconf_all->mc_forwarding--; |
7bc570c8 YH |
1271 | write_unlock_bh(&mrt_lock); |
1272 | ||
8229efda | 1273 | mroute_clean_tables(net); |
7bc570c8 YH |
1274 | } else |
1275 | err = -EACCES; | |
1276 | rtnl_unlock(); | |
1277 | ||
1278 | return err; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Socket options and virtual interface manipulation. The whole | |
1283 | * virtual interface system is a complete heap, but unfortunately | |
1284 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1285 | * MOSPF/PIM router set up we can clean this up. | |
1286 | */ | |
1287 | ||
1288 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) | |
1289 | { | |
1290 | int ret; | |
1291 | struct mif6ctl vif; | |
1292 | struct mf6cctl mfc; | |
1293 | mifi_t mifi; | |
8229efda | 1294 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1295 | |
1296 | if (optname != MRT6_INIT) { | |
8229efda | 1297 | if (sk != net->ipv6.mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1298 | return -EACCES; |
1299 | } | |
1300 | ||
1301 | switch (optname) { | |
1302 | case MRT6_INIT: | |
1303 | if (sk->sk_type != SOCK_RAW || | |
1304 | inet_sk(sk)->num != IPPROTO_ICMPV6) | |
1305 | return -EOPNOTSUPP; | |
1306 | if (optlen < sizeof(int)) | |
1307 | return -EINVAL; | |
1308 | ||
1309 | return ip6mr_sk_init(sk); | |
1310 | ||
1311 | case MRT6_DONE: | |
1312 | return ip6mr_sk_done(sk); | |
1313 | ||
1314 | case MRT6_ADD_MIF: | |
1315 | if (optlen < sizeof(vif)) | |
1316 | return -EINVAL; | |
1317 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1318 | return -EFAULT; | |
6ac7eb08 | 1319 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1320 | return -ENFILE; |
1321 | rtnl_lock(); | |
8229efda | 1322 | ret = mif6_add(net, &vif, sk == net->ipv6.mroute6_sk); |
7bc570c8 YH |
1323 | rtnl_unlock(); |
1324 | return ret; | |
1325 | ||
1326 | case MRT6_DEL_MIF: | |
1327 | if (optlen < sizeof(mifi_t)) | |
1328 | return -EINVAL; | |
1329 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1330 | return -EFAULT; | |
1331 | rtnl_lock(); | |
8229efda | 1332 | ret = mif6_delete(net, mifi); |
7bc570c8 YH |
1333 | rtnl_unlock(); |
1334 | return ret; | |
1335 | ||
1336 | /* | |
1337 | * Manipulate the forwarding caches. These live | |
1338 | * in a sort of kernel/user symbiosis. | |
1339 | */ | |
1340 | case MRT6_ADD_MFC: | |
1341 | case MRT6_DEL_MFC: | |
1342 | if (optlen < sizeof(mfc)) | |
1343 | return -EINVAL; | |
1344 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1345 | return -EFAULT; | |
1346 | rtnl_lock(); | |
1347 | if (optname == MRT6_DEL_MFC) | |
8229efda | 1348 | ret = ip6mr_mfc_delete(net, &mfc); |
7bc570c8 | 1349 | else |
8229efda BT |
1350 | ret = ip6mr_mfc_add(net, &mfc, |
1351 | sk == net->ipv6.mroute6_sk); | |
7bc570c8 YH |
1352 | rtnl_unlock(); |
1353 | return ret; | |
1354 | ||
14fb64e1 YH |
1355 | /* |
1356 | * Control PIM assert (to activate pim will activate assert) | |
1357 | */ | |
1358 | case MRT6_ASSERT: | |
1359 | { | |
1360 | int v; | |
1361 | if (get_user(v, (int __user *)optval)) | |
1362 | return -EFAULT; | |
8229efda | 1363 | net->ipv6.mroute_do_assert = !!v; |
14fb64e1 YH |
1364 | return 0; |
1365 | } | |
1366 | ||
1367 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1368 | case MRT6_PIM: | |
1369 | { | |
a9f83bf3 | 1370 | int v; |
14fb64e1 YH |
1371 | if (get_user(v, (int __user *)optval)) |
1372 | return -EFAULT; | |
1373 | v = !!v; | |
1374 | rtnl_lock(); | |
1375 | ret = 0; | |
8229efda BT |
1376 | if (v != net->ipv6.mroute_do_pim) { |
1377 | net->ipv6.mroute_do_pim = v; | |
1378 | net->ipv6.mroute_do_assert = v; | |
14fb64e1 YH |
1379 | } |
1380 | rtnl_unlock(); | |
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | #endif | |
7bc570c8 | 1385 | /* |
7d120c55 | 1386 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1387 | * set. |
1388 | */ | |
1389 | default: | |
1390 | return -ENOPROTOOPT; | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Getsock opt support for the multicast routing system. | |
1396 | */ | |
1397 | ||
1398 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1399 | int __user *optlen) | |
1400 | { | |
1401 | int olr; | |
1402 | int val; | |
8229efda | 1403 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1404 | |
1405 | switch (optname) { | |
1406 | case MRT6_VERSION: | |
1407 | val = 0x0305; | |
1408 | break; | |
14fb64e1 YH |
1409 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1410 | case MRT6_PIM: | |
8229efda | 1411 | val = net->ipv6.mroute_do_pim; |
14fb64e1 YH |
1412 | break; |
1413 | #endif | |
1414 | case MRT6_ASSERT: | |
8229efda | 1415 | val = net->ipv6.mroute_do_assert; |
14fb64e1 | 1416 | break; |
7bc570c8 YH |
1417 | default: |
1418 | return -ENOPROTOOPT; | |
1419 | } | |
1420 | ||
1421 | if (get_user(olr, optlen)) | |
1422 | return -EFAULT; | |
1423 | ||
1424 | olr = min_t(int, olr, sizeof(int)); | |
1425 | if (olr < 0) | |
1426 | return -EINVAL; | |
1427 | ||
1428 | if (put_user(olr, optlen)) | |
1429 | return -EFAULT; | |
1430 | if (copy_to_user(optval, &val, olr)) | |
1431 | return -EFAULT; | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * The IP multicast ioctl support routines. | |
1437 | */ | |
1438 | ||
1439 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1440 | { | |
1441 | struct sioc_sg_req6 sr; | |
1442 | struct sioc_mif_req6 vr; | |
1443 | struct mif_device *vif; | |
1444 | struct mfc6_cache *c; | |
8229efda | 1445 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1446 | |
1447 | switch (cmd) { | |
1448 | case SIOCGETMIFCNT_IN6: | |
1449 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1450 | return -EFAULT; | |
8229efda | 1451 | if (vr.mifi >= net->ipv6.maxvif) |
7bc570c8 YH |
1452 | return -EINVAL; |
1453 | read_lock(&mrt_lock); | |
8229efda BT |
1454 | vif = &net->ipv6.vif6_table[vr.mifi]; |
1455 | if (MIF_EXISTS(net, vr.mifi)) { | |
7bc570c8 YH |
1456 | vr.icount = vif->pkt_in; |
1457 | vr.ocount = vif->pkt_out; | |
1458 | vr.ibytes = vif->bytes_in; | |
1459 | vr.obytes = vif->bytes_out; | |
1460 | read_unlock(&mrt_lock); | |
1461 | ||
1462 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1463 | return -EFAULT; | |
1464 | return 0; | |
1465 | } | |
1466 | read_unlock(&mrt_lock); | |
1467 | return -EADDRNOTAVAIL; | |
1468 | case SIOCGETSGCNT_IN6: | |
1469 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1470 | return -EFAULT; | |
1471 | ||
1472 | read_lock(&mrt_lock); | |
8229efda | 1473 | c = ip6mr_cache_find(net, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1474 | if (c) { |
1475 | sr.pktcnt = c->mfc_un.res.pkt; | |
1476 | sr.bytecnt = c->mfc_un.res.bytes; | |
1477 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1478 | read_unlock(&mrt_lock); | |
1479 | ||
1480 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1481 | return -EFAULT; | |
1482 | return 0; | |
1483 | } | |
1484 | read_unlock(&mrt_lock); | |
1485 | return -EADDRNOTAVAIL; | |
1486 | default: | |
1487 | return -ENOIOCTLCMD; | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | ||
1492 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1493 | { | |
adf30907 | 1494 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1495 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1496 | return dst_output(skb); |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Processing handlers for ip6mr_forward | |
1501 | */ | |
1502 | ||
1503 | static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
1504 | { | |
1505 | struct ipv6hdr *ipv6h; | |
8229efda BT |
1506 | struct net *net = mfc6_net(c); |
1507 | struct mif_device *vif = &net->ipv6.vif6_table[vifi]; | |
7bc570c8 YH |
1508 | struct net_device *dev; |
1509 | struct dst_entry *dst; | |
1510 | struct flowi fl; | |
1511 | ||
1512 | if (vif->dev == NULL) | |
1513 | goto out_free; | |
1514 | ||
14fb64e1 YH |
1515 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1516 | if (vif->flags & MIFF_REGISTER) { | |
1517 | vif->pkt_out++; | |
1518 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1519 | vif->dev->stats.tx_bytes += skb->len; |
1520 | vif->dev->stats.tx_packets++; | |
8229efda | 1521 | ip6mr_cache_report(net, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1522 | goto out_free; |
14fb64e1 YH |
1523 | } |
1524 | #endif | |
1525 | ||
7bc570c8 YH |
1526 | ipv6h = ipv6_hdr(skb); |
1527 | ||
1528 | fl = (struct flowi) { | |
1529 | .oif = vif->link, | |
1530 | .nl_u = { .ip6_u = | |
1531 | { .daddr = ipv6h->daddr, } | |
1532 | } | |
1533 | }; | |
1534 | ||
8229efda | 1535 | dst = ip6_route_output(net, NULL, &fl); |
7bc570c8 YH |
1536 | if (!dst) |
1537 | goto out_free; | |
1538 | ||
adf30907 ED |
1539 | skb_dst_drop(skb); |
1540 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1541 | |
1542 | /* | |
1543 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1544 | * not only before forwarding, but after forwarding on all output | |
1545 | * interfaces. It is clear, if mrouter runs a multicasting | |
1546 | * program, it should receive packets not depending to what interface | |
1547 | * program is joined. | |
1548 | * If we will not make it, the program will have to join on all | |
1549 | * interfaces. On the other hand, multihoming host (or router, but | |
1550 | * not mrouter) cannot join to more than one interface - it will | |
1551 | * result in receiving multiple packets. | |
1552 | */ | |
1553 | dev = vif->dev; | |
1554 | skb->dev = dev; | |
1555 | vif->pkt_out++; | |
1556 | vif->bytes_out += skb->len; | |
1557 | ||
1558 | /* We are about to write */ | |
1559 | /* XXX: extension headers? */ | |
1560 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1561 | goto out_free; | |
1562 | ||
1563 | ipv6h = ipv6_hdr(skb); | |
1564 | ipv6h->hop_limit--; | |
1565 | ||
1566 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1567 | ||
1568 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev, | |
1569 | ip6mr_forward2_finish); | |
1570 | ||
1571 | out_free: | |
1572 | kfree_skb(skb); | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | static int ip6mr_find_vif(struct net_device *dev) | |
1577 | { | |
8229efda | 1578 | struct net *net = dev_net(dev); |
7bc570c8 | 1579 | int ct; |
8229efda BT |
1580 | for (ct = net->ipv6.maxvif - 1; ct >= 0; ct--) { |
1581 | if (net->ipv6.vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1582 | break; |
1583 | } | |
1584 | return ct; | |
1585 | } | |
1586 | ||
1587 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache) | |
1588 | { | |
1589 | int psend = -1; | |
1590 | int vif, ct; | |
8229efda | 1591 | struct net *net = mfc6_net(cache); |
7bc570c8 YH |
1592 | |
1593 | vif = cache->mf6c_parent; | |
1594 | cache->mfc_un.res.pkt++; | |
1595 | cache->mfc_un.res.bytes += skb->len; | |
1596 | ||
14fb64e1 YH |
1597 | /* |
1598 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1599 | */ | |
8229efda | 1600 | if (net->ipv6.vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1601 | int true_vifi; |
1602 | ||
1603 | cache->mfc_un.res.wrong_if++; | |
1604 | true_vifi = ip6mr_find_vif(skb->dev); | |
1605 | ||
8229efda | 1606 | if (true_vifi >= 0 && net->ipv6.mroute_do_assert && |
14fb64e1 YH |
1607 | /* pimsm uses asserts, when switching from RPT to SPT, |
1608 | so that we cannot check that packet arrived on an oif. | |
1609 | It is bad, but otherwise we would need to move pretty | |
1610 | large chunk of pimd to kernel. Ough... --ANK | |
1611 | */ | |
8229efda | 1612 | (net->ipv6.mroute_do_pim || |
a21f3f99 | 1613 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
1614 | time_after(jiffies, |
1615 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1616 | cache->mfc_un.res.last_assert = jiffies; | |
8229efda | 1617 | ip6mr_cache_report(net, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
1618 | } |
1619 | goto dont_forward; | |
1620 | } | |
1621 | ||
8229efda BT |
1622 | net->ipv6.vif6_table[vif].pkt_in++; |
1623 | net->ipv6.vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
1624 | |
1625 | /* | |
1626 | * Forward the frame | |
1627 | */ | |
1628 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1629 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1630 | if (psend != -1) { | |
1631 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1632 | if (skb2) | |
1633 | ip6mr_forward2(skb2, cache, psend); | |
1634 | } | |
1635 | psend = ct; | |
1636 | } | |
1637 | } | |
1638 | if (psend != -1) { | |
1639 | ip6mr_forward2(skb, cache, psend); | |
1640 | return 0; | |
1641 | } | |
1642 | ||
14fb64e1 | 1643 | dont_forward: |
7bc570c8 YH |
1644 | kfree_skb(skb); |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | ||
1649 | /* | |
1650 | * Multicast packets for forwarding arrive here | |
1651 | */ | |
1652 | ||
1653 | int ip6_mr_input(struct sk_buff *skb) | |
1654 | { | |
1655 | struct mfc6_cache *cache; | |
8229efda | 1656 | struct net *net = dev_net(skb->dev); |
7bc570c8 YH |
1657 | |
1658 | read_lock(&mrt_lock); | |
8229efda BT |
1659 | cache = ip6mr_cache_find(net, |
1660 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); | |
7bc570c8 YH |
1661 | |
1662 | /* | |
1663 | * No usable cache entry | |
1664 | */ | |
1665 | if (cache == NULL) { | |
1666 | int vif; | |
1667 | ||
1668 | vif = ip6mr_find_vif(skb->dev); | |
1669 | if (vif >= 0) { | |
8229efda | 1670 | int err = ip6mr_cache_unresolved(net, vif, skb); |
7bc570c8 YH |
1671 | read_unlock(&mrt_lock); |
1672 | ||
1673 | return err; | |
1674 | } | |
1675 | read_unlock(&mrt_lock); | |
1676 | kfree_skb(skb); | |
1677 | return -ENODEV; | |
1678 | } | |
1679 | ||
1680 | ip6_mr_forward(skb, cache); | |
1681 | ||
1682 | read_unlock(&mrt_lock); | |
1683 | ||
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | ||
1688 | static int | |
1689 | ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm) | |
1690 | { | |
1691 | int ct; | |
1692 | struct rtnexthop *nhp; | |
8229efda BT |
1693 | struct net *net = mfc6_net(c); |
1694 | struct net_device *dev = net->ipv6.vif6_table[c->mf6c_parent].dev; | |
549e028d | 1695 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
1696 | struct rtattr *mp_head; |
1697 | ||
1698 | if (dev) | |
1699 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1700 | ||
1701 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
1702 | ||
1703 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1704 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1705 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1706 | goto rtattr_failure; | |
1707 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1708 | nhp->rtnh_flags = 0; | |
1709 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
8229efda | 1710 | nhp->rtnh_ifindex = net->ipv6.vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
1711 | nhp->rtnh_len = sizeof(*nhp); |
1712 | } | |
1713 | } | |
1714 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 1715 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
1716 | rtm->rtm_type = RTN_MULTICAST; |
1717 | return 1; | |
1718 | ||
1719 | rtattr_failure: | |
1720 | nlmsg_trim(skb, b); | |
1721 | return -EMSGSIZE; | |
1722 | } | |
1723 | ||
8229efda BT |
1724 | int ip6mr_get_route(struct net *net, |
1725 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
1726 | { |
1727 | int err; | |
1728 | struct mfc6_cache *cache; | |
adf30907 | 1729 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 YH |
1730 | |
1731 | read_lock(&mrt_lock); | |
8229efda | 1732 | cache = ip6mr_cache_find(net, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
1733 | |
1734 | if (!cache) { | |
1735 | struct sk_buff *skb2; | |
1736 | struct ipv6hdr *iph; | |
1737 | struct net_device *dev; | |
1738 | int vif; | |
1739 | ||
1740 | if (nowait) { | |
1741 | read_unlock(&mrt_lock); | |
1742 | return -EAGAIN; | |
1743 | } | |
1744 | ||
1745 | dev = skb->dev; | |
1746 | if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { | |
1747 | read_unlock(&mrt_lock); | |
1748 | return -ENODEV; | |
1749 | } | |
1750 | ||
1751 | /* really correct? */ | |
1752 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
1753 | if (!skb2) { | |
1754 | read_unlock(&mrt_lock); | |
1755 | return -ENOMEM; | |
1756 | } | |
1757 | ||
1758 | skb_reset_transport_header(skb2); | |
1759 | ||
1760 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
1761 | skb_reset_network_header(skb2); | |
1762 | ||
1763 | iph = ipv6_hdr(skb2); | |
1764 | iph->version = 0; | |
1765 | iph->priority = 0; | |
1766 | iph->flow_lbl[0] = 0; | |
1767 | iph->flow_lbl[1] = 0; | |
1768 | iph->flow_lbl[2] = 0; | |
1769 | iph->payload_len = 0; | |
1770 | iph->nexthdr = IPPROTO_NONE; | |
1771 | iph->hop_limit = 0; | |
1772 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
1773 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
1774 | ||
8229efda | 1775 | err = ip6mr_cache_unresolved(net, vif, skb2); |
7bc570c8 YH |
1776 | read_unlock(&mrt_lock); |
1777 | ||
1778 | return err; | |
1779 | } | |
1780 | ||
1781 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1782 | cache->mfc_flags |= MFC_NOTIFY; | |
1783 | ||
1784 | err = ip6mr_fill_mroute(skb, cache, rtm); | |
1785 | read_unlock(&mrt_lock); | |
1786 | return err; | |
1787 | } | |
1788 |