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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 YH |
66 | /* Special spinlock for queue of unresolved entries */ |
67 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
68 | ||
69 | /* We return to original Alan's scheme. Hash table of resolved | |
70 | entries is changed only in process context and protected | |
71 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
72 | with strong spinlock mfc_unres_lock. | |
73 | ||
74 | In this case data path is free of exclusive locks at all. | |
75 | */ | |
76 | ||
77 | static struct kmem_cache *mrt_cachep __read_mostly; | |
78 | ||
b5aa30b1 PM |
79 | static int ip6_mr_forward(struct net *net, struct sk_buff *skb, |
80 | 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); | |
b5aa30b1 PM |
83 | static int ip6mr_fill_mroute(struct net *net, struct sk_buff *skb, |
84 | struct mfc6_cache *c, struct rtmsg *rtm); | |
8229efda | 85 | static void mroute_clean_tables(struct net *net); |
7bc570c8 | 86 | |
7bc570c8 YH |
87 | |
88 | #ifdef CONFIG_PROC_FS | |
89 | ||
90 | struct ipmr_mfc_iter { | |
8b90fc7e | 91 | struct seq_net_private p; |
7bc570c8 YH |
92 | struct mfc6_cache **cache; |
93 | int ct; | |
94 | }; | |
95 | ||
96 | ||
8b90fc7e BT |
97 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
98 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 YH |
99 | { |
100 | struct mfc6_cache *mfc; | |
101 | ||
8b90fc7e | 102 | it->cache = net->ipv6.mfc6_cache_array; |
7bc570c8 | 103 | read_lock(&mrt_lock); |
4a6258a0 | 104 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) |
8b90fc7e | 105 | for (mfc = net->ipv6.mfc6_cache_array[it->ct]; |
4a6258a0 | 106 | mfc; mfc = mfc->next) |
7bc570c8 YH |
107 | if (pos-- == 0) |
108 | return mfc; | |
109 | read_unlock(&mrt_lock); | |
110 | ||
c476efbc | 111 | it->cache = &net->ipv6.mfc6_unres_queue; |
7bc570c8 | 112 | spin_lock_bh(&mfc_unres_lock); |
c476efbc PM |
113 | for (mfc = net->ipv6.mfc6_unres_queue; mfc; mfc = mfc->next) |
114 | if (pos-- == 0) | |
7bc570c8 YH |
115 | return mfc; |
116 | spin_unlock_bh(&mfc_unres_lock); | |
117 | ||
118 | it->cache = NULL; | |
119 | return NULL; | |
120 | } | |
121 | ||
122 | ||
123 | ||
124 | ||
125 | /* | |
126 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
127 | */ | |
128 | ||
129 | struct ipmr_vif_iter { | |
8b90fc7e | 130 | struct seq_net_private p; |
7bc570c8 YH |
131 | int ct; |
132 | }; | |
133 | ||
8b90fc7e BT |
134 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
135 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
136 | loff_t pos) |
137 | { | |
8b90fc7e BT |
138 | for (iter->ct = 0; iter->ct < net->ipv6.maxvif; ++iter->ct) { |
139 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 YH |
140 | continue; |
141 | if (pos-- == 0) | |
8b90fc7e | 142 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
143 | } |
144 | return NULL; | |
145 | } | |
146 | ||
147 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
148 | __acquires(mrt_lock) | |
149 | { | |
8b90fc7e BT |
150 | struct net *net = seq_file_net(seq); |
151 | ||
7bc570c8 | 152 | read_lock(&mrt_lock); |
8b90fc7e BT |
153 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
154 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
155 | } |
156 | ||
157 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
158 | { | |
159 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 160 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
161 | |
162 | ++*pos; | |
163 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 164 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 165 | |
8b90fc7e BT |
166 | while (++iter->ct < net->ipv6.maxvif) { |
167 | if (!MIF_EXISTS(net, iter->ct)) | |
7bc570c8 | 168 | continue; |
8b90fc7e | 169 | return &net->ipv6.vif6_table[iter->ct]; |
7bc570c8 YH |
170 | } |
171 | return NULL; | |
172 | } | |
173 | ||
174 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
175 | __releases(mrt_lock) | |
176 | { | |
177 | read_unlock(&mrt_lock); | |
178 | } | |
179 | ||
180 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
181 | { | |
8b90fc7e BT |
182 | struct net *net = seq_file_net(seq); |
183 | ||
7bc570c8 YH |
184 | if (v == SEQ_START_TOKEN) { |
185 | seq_puts(seq, | |
186 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
187 | } else { | |
188 | const struct mif_device *vif = v; | |
189 | const char *name = vif->dev ? vif->dev->name : "none"; | |
190 | ||
191 | seq_printf(seq, | |
d430a227 | 192 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
8b90fc7e | 193 | vif - net->ipv6.vif6_table, |
7bc570c8 YH |
194 | name, vif->bytes_in, vif->pkt_in, |
195 | vif->bytes_out, vif->pkt_out, | |
196 | vif->flags); | |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
98147d52 | 201 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
202 | .start = ip6mr_vif_seq_start, |
203 | .next = ip6mr_vif_seq_next, | |
204 | .stop = ip6mr_vif_seq_stop, | |
205 | .show = ip6mr_vif_seq_show, | |
206 | }; | |
207 | ||
208 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
209 | { | |
8b90fc7e BT |
210 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
211 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
212 | } |
213 | ||
5ca1b998 | 214 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
215 | .owner = THIS_MODULE, |
216 | .open = ip6mr_vif_open, | |
217 | .read = seq_read, | |
218 | .llseek = seq_lseek, | |
8b90fc7e | 219 | .release = seq_release_net, |
7bc570c8 YH |
220 | }; |
221 | ||
222 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
223 | { | |
8b90fc7e BT |
224 | struct net *net = seq_file_net(seq); |
225 | ||
226 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) | |
227 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
228 | } |
229 | ||
230 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
231 | { | |
232 | struct mfc6_cache *mfc = v; | |
233 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 234 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
235 | |
236 | ++*pos; | |
237 | ||
238 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 239 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 YH |
240 | |
241 | if (mfc->next) | |
242 | return mfc->next; | |
243 | ||
c476efbc | 244 | if (it->cache == &net->ipv6.mfc6_unres_queue) |
7bc570c8 YH |
245 | goto end_of_list; |
246 | ||
8b90fc7e | 247 | BUG_ON(it->cache != net->ipv6.mfc6_cache_array); |
7bc570c8 | 248 | |
4a6258a0 | 249 | while (++it->ct < MFC6_LINES) { |
8b90fc7e | 250 | mfc = net->ipv6.mfc6_cache_array[it->ct]; |
7bc570c8 YH |
251 | if (mfc) |
252 | return mfc; | |
253 | } | |
254 | ||
255 | /* exhausted cache_array, show unresolved */ | |
256 | read_unlock(&mrt_lock); | |
c476efbc | 257 | it->cache = &net->ipv6.mfc6_unres_queue; |
7bc570c8 YH |
258 | it->ct = 0; |
259 | ||
260 | spin_lock_bh(&mfc_unres_lock); | |
c476efbc | 261 | mfc = net->ipv6.mfc6_unres_queue; |
7bc570c8 YH |
262 | if (mfc) |
263 | return mfc; | |
264 | ||
265 | end_of_list: | |
266 | spin_unlock_bh(&mfc_unres_lock); | |
267 | it->cache = NULL; | |
268 | ||
269 | return NULL; | |
270 | } | |
271 | ||
272 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
273 | { | |
274 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 275 | struct net *net = seq_file_net(seq); |
7bc570c8 | 276 | |
c476efbc | 277 | if (it->cache == &net->ipv6.mfc6_unres_queue) |
7bc570c8 | 278 | spin_unlock_bh(&mfc_unres_lock); |
8b90fc7e | 279 | else if (it->cache == net->ipv6.mfc6_cache_array) |
7bc570c8 YH |
280 | read_unlock(&mrt_lock); |
281 | } | |
282 | ||
283 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
284 | { | |
285 | int n; | |
8b90fc7e | 286 | struct net *net = seq_file_net(seq); |
7bc570c8 YH |
287 | |
288 | if (v == SEQ_START_TOKEN) { | |
289 | seq_puts(seq, | |
290 | "Group " | |
291 | "Origin " | |
292 | "Iif Pkts Bytes Wrong Oifs\n"); | |
293 | } else { | |
294 | const struct mfc6_cache *mfc = v; | |
295 | const struct ipmr_mfc_iter *it = seq->private; | |
296 | ||
999890b2 | 297 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 298 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 299 | mfc->mf6c_parent); |
7bc570c8 | 300 | |
c476efbc | 301 | if (it->cache != &net->ipv6.mfc6_unres_queue) { |
1ea472e2 BT |
302 | seq_printf(seq, " %8lu %8lu %8lu", |
303 | mfc->mfc_un.res.pkt, | |
304 | mfc->mfc_un.res.bytes, | |
305 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
306 | for (n = mfc->mfc_un.res.minvif; |
307 | n < mfc->mfc_un.res.maxvif; n++) { | |
8b90fc7e | 308 | if (MIF_EXISTS(net, n) && |
7bc570c8 YH |
309 | mfc->mfc_un.res.ttls[n] < 255) |
310 | seq_printf(seq, | |
311 | " %2d:%-3d", | |
312 | n, mfc->mfc_un.res.ttls[n]); | |
313 | } | |
1ea472e2 BT |
314 | } else { |
315 | /* unresolved mfc_caches don't contain | |
316 | * pkt, bytes and wrong_if values | |
317 | */ | |
318 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
319 | } |
320 | seq_putc(seq, '\n'); | |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
88e9d34c | 325 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
326 | .start = ipmr_mfc_seq_start, |
327 | .next = ipmr_mfc_seq_next, | |
328 | .stop = ipmr_mfc_seq_stop, | |
329 | .show = ipmr_mfc_seq_show, | |
330 | }; | |
331 | ||
332 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
333 | { | |
8b90fc7e BT |
334 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
335 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
336 | } |
337 | ||
5ca1b998 | 338 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
339 | .owner = THIS_MODULE, |
340 | .open = ipmr_mfc_open, | |
341 | .read = seq_read, | |
342 | .llseek = seq_lseek, | |
8b90fc7e | 343 | .release = seq_release_net, |
7bc570c8 YH |
344 | }; |
345 | #endif | |
346 | ||
14fb64e1 | 347 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
348 | |
349 | static int pim6_rcv(struct sk_buff *skb) | |
350 | { | |
351 | struct pimreghdr *pim; | |
352 | struct ipv6hdr *encap; | |
353 | struct net_device *reg_dev = NULL; | |
8229efda BT |
354 | struct net *net = dev_net(skb->dev); |
355 | int reg_vif_num = net->ipv6.mroute_reg_vif_num; | |
14fb64e1 YH |
356 | |
357 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
358 | goto drop; | |
359 | ||
360 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
361 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
362 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
363 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
364 | sizeof(*pim), IPPROTO_PIM, | |
365 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 366 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
367 | goto drop; |
368 | ||
369 | /* check if the inner packet is destined to mcast group */ | |
370 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
371 | sizeof(*pim)); | |
372 | ||
373 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
374 | encap->payload_len == 0 || | |
375 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
376 | goto drop; | |
377 | ||
378 | read_lock(&mrt_lock); | |
379 | if (reg_vif_num >= 0) | |
8229efda | 380 | reg_dev = net->ipv6.vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
381 | if (reg_dev) |
382 | dev_hold(reg_dev); | |
383 | read_unlock(&mrt_lock); | |
384 | ||
385 | if (reg_dev == NULL) | |
386 | goto drop; | |
387 | ||
388 | skb->mac_header = skb->network_header; | |
389 | skb_pull(skb, (u8 *)encap - skb->data); | |
390 | skb_reset_network_header(skb); | |
391 | skb->dev = reg_dev; | |
1d6e55f1 | 392 | skb->protocol = htons(ETH_P_IPV6); |
14fb64e1 YH |
393 | skb->ip_summed = 0; |
394 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 395 | skb_dst_drop(skb); |
dc58c78c PE |
396 | reg_dev->stats.rx_bytes += skb->len; |
397 | reg_dev->stats.rx_packets++; | |
14fb64e1 YH |
398 | nf_reset(skb); |
399 | netif_rx(skb); | |
400 | dev_put(reg_dev); | |
401 | return 0; | |
402 | drop: | |
403 | kfree_skb(skb); | |
404 | return 0; | |
405 | } | |
406 | ||
41135cc8 | 407 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
408 | .handler = pim6_rcv, |
409 | }; | |
410 | ||
411 | /* Service routines creating virtual interfaces: PIMREG */ | |
412 | ||
6fef4c0c SH |
413 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
414 | struct net_device *dev) | |
14fb64e1 | 415 | { |
8229efda BT |
416 | struct net *net = dev_net(dev); |
417 | ||
14fb64e1 | 418 | read_lock(&mrt_lock); |
dc58c78c PE |
419 | dev->stats.tx_bytes += skb->len; |
420 | dev->stats.tx_packets++; | |
8229efda BT |
421 | ip6mr_cache_report(net, skb, net->ipv6.mroute_reg_vif_num, |
422 | MRT6MSG_WHOLEPKT); | |
14fb64e1 YH |
423 | read_unlock(&mrt_lock); |
424 | kfree_skb(skb); | |
6ed10654 | 425 | return NETDEV_TX_OK; |
14fb64e1 YH |
426 | } |
427 | ||
007c3838 SH |
428 | static const struct net_device_ops reg_vif_netdev_ops = { |
429 | .ndo_start_xmit = reg_vif_xmit, | |
430 | }; | |
431 | ||
14fb64e1 YH |
432 | static void reg_vif_setup(struct net_device *dev) |
433 | { | |
434 | dev->type = ARPHRD_PIMREG; | |
435 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
436 | dev->flags = IFF_NOARP; | |
007c3838 | 437 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 438 | dev->destructor = free_netdev; |
403dbb97 | 439 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
440 | } |
441 | ||
8229efda | 442 | static struct net_device *ip6mr_reg_vif(struct net *net) |
14fb64e1 YH |
443 | { |
444 | struct net_device *dev; | |
14fb64e1 | 445 | |
dc58c78c | 446 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
14fb64e1 YH |
447 | if (dev == NULL) |
448 | return NULL; | |
449 | ||
8229efda BT |
450 | dev_net_set(dev, net); |
451 | ||
14fb64e1 YH |
452 | if (register_netdevice(dev)) { |
453 | free_netdev(dev); | |
454 | return NULL; | |
455 | } | |
456 | dev->iflink = 0; | |
457 | ||
14fb64e1 YH |
458 | if (dev_open(dev)) |
459 | goto failure; | |
460 | ||
7af3db78 | 461 | dev_hold(dev); |
14fb64e1 YH |
462 | return dev; |
463 | ||
464 | failure: | |
465 | /* allow the register to be completed before unregistering. */ | |
466 | rtnl_unlock(); | |
467 | rtnl_lock(); | |
468 | ||
469 | unregister_netdevice(dev); | |
470 | return NULL; | |
471 | } | |
472 | #endif | |
473 | ||
7bc570c8 YH |
474 | /* |
475 | * Delete a VIF entry | |
476 | */ | |
477 | ||
c871e664 | 478 | static int mif6_delete(struct net *net, int vifi, struct list_head *head) |
7bc570c8 YH |
479 | { |
480 | struct mif_device *v; | |
481 | struct net_device *dev; | |
1d6e55f1 | 482 | struct inet6_dev *in6_dev; |
8229efda | 483 | if (vifi < 0 || vifi >= net->ipv6.maxvif) |
7bc570c8 YH |
484 | return -EADDRNOTAVAIL; |
485 | ||
8229efda | 486 | v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 YH |
487 | |
488 | write_lock_bh(&mrt_lock); | |
489 | dev = v->dev; | |
490 | v->dev = NULL; | |
491 | ||
492 | if (!dev) { | |
493 | write_unlock_bh(&mrt_lock); | |
494 | return -EADDRNOTAVAIL; | |
495 | } | |
496 | ||
14fb64e1 | 497 | #ifdef CONFIG_IPV6_PIMSM_V2 |
8229efda BT |
498 | if (vifi == net->ipv6.mroute_reg_vif_num) |
499 | net->ipv6.mroute_reg_vif_num = -1; | |
14fb64e1 YH |
500 | #endif |
501 | ||
8229efda | 502 | if (vifi + 1 == net->ipv6.maxvif) { |
7bc570c8 YH |
503 | int tmp; |
504 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
8229efda | 505 | if (MIF_EXISTS(net, tmp)) |
7bc570c8 YH |
506 | break; |
507 | } | |
8229efda | 508 | net->ipv6.maxvif = tmp + 1; |
7bc570c8 YH |
509 | } |
510 | ||
511 | write_unlock_bh(&mrt_lock); | |
512 | ||
513 | dev_set_allmulti(dev, -1); | |
514 | ||
1d6e55f1 TG |
515 | in6_dev = __in6_dev_get(dev); |
516 | if (in6_dev) | |
517 | in6_dev->cnf.mc_forwarding--; | |
518 | ||
7bc570c8 | 519 | if (v->flags & MIFF_REGISTER) |
c871e664 | 520 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
521 | |
522 | dev_put(dev); | |
523 | return 0; | |
524 | } | |
525 | ||
58701ad4 BT |
526 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
527 | { | |
58701ad4 BT |
528 | kmem_cache_free(mrt_cachep, c); |
529 | } | |
530 | ||
7bc570c8 YH |
531 | /* Destroy an unresolved cache entry, killing queued skbs |
532 | and reporting error to netlink readers. | |
533 | */ | |
534 | ||
b5aa30b1 | 535 | static void ip6mr_destroy_unres(struct net *net, struct mfc6_cache *c) |
7bc570c8 YH |
536 | { |
537 | struct sk_buff *skb; | |
538 | ||
8229efda | 539 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
540 | |
541 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
542 | if (ipv6_hdr(skb)->version == 0) { | |
543 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
544 | nlh->nlmsg_type = NLMSG_ERROR; | |
545 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
546 | skb_trim(skb, nlh->nlmsg_len); | |
547 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 548 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
549 | } else |
550 | kfree_skb(skb); | |
551 | } | |
552 | ||
58701ad4 | 553 | ip6mr_cache_free(c); |
7bc570c8 YH |
554 | } |
555 | ||
556 | ||
c476efbc | 557 | /* Timer process for all the unresolved queue. */ |
7bc570c8 | 558 | |
c476efbc | 559 | static void ipmr_do_expire_process(struct net *net) |
7bc570c8 YH |
560 | { |
561 | unsigned long now = jiffies; | |
562 | unsigned long expires = 10 * HZ; | |
563 | struct mfc6_cache *c, **cp; | |
564 | ||
c476efbc | 565 | cp = &net->ipv6.mfc6_unres_queue; |
7bc570c8 YH |
566 | |
567 | while ((c = *cp) != NULL) { | |
568 | if (time_after(c->mfc_un.unres.expires, now)) { | |
569 | /* not yet... */ | |
570 | unsigned long interval = c->mfc_un.unres.expires - now; | |
571 | if (interval < expires) | |
572 | expires = interval; | |
573 | cp = &c->next; | |
574 | continue; | |
575 | } | |
576 | ||
577 | *cp = c->next; | |
b5aa30b1 | 578 | ip6mr_destroy_unres(net, c); |
7bc570c8 YH |
579 | } |
580 | ||
c476efbc PM |
581 | if (net->ipv6.mfc6_unres_queue != NULL) |
582 | mod_timer(&net->ipv6.ipmr_expire_timer, jiffies + expires); | |
7bc570c8 YH |
583 | } |
584 | ||
c476efbc | 585 | static void ipmr_expire_process(unsigned long arg) |
7bc570c8 | 586 | { |
c476efbc PM |
587 | struct net *net = (struct net *)arg; |
588 | ||
7bc570c8 | 589 | if (!spin_trylock(&mfc_unres_lock)) { |
c476efbc | 590 | mod_timer(&net->ipv6.ipmr_expire_timer, jiffies + 1); |
7bc570c8 YH |
591 | return; |
592 | } | |
593 | ||
c476efbc PM |
594 | if (net->ipv6.mfc6_unres_queue != NULL) |
595 | ipmr_do_expire_process(net); | |
7bc570c8 YH |
596 | |
597 | spin_unlock(&mfc_unres_lock); | |
598 | } | |
599 | ||
600 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
601 | ||
b5aa30b1 PM |
602 | static void ip6mr_update_thresholds(struct net *net, struct mfc6_cache *cache, |
603 | unsigned char *ttls) | |
7bc570c8 YH |
604 | { |
605 | int vifi; | |
606 | ||
6ac7eb08 | 607 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 608 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 609 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 610 | |
8229efda BT |
611 | for (vifi = 0; vifi < net->ipv6.maxvif; vifi++) { |
612 | if (MIF_EXISTS(net, vifi) && | |
4e16880c | 613 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
614 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
615 | if (cache->mfc_un.res.minvif > vifi) | |
616 | cache->mfc_un.res.minvif = vifi; | |
617 | if (cache->mfc_un.res.maxvif <= vifi) | |
618 | cache->mfc_un.res.maxvif = vifi + 1; | |
619 | } | |
620 | } | |
621 | } | |
622 | ||
8229efda | 623 | static int mif6_add(struct net *net, struct mif6ctl *vifc, int mrtsock) |
7bc570c8 YH |
624 | { |
625 | int vifi = vifc->mif6c_mifi; | |
8229efda | 626 | struct mif_device *v = &net->ipv6.vif6_table[vifi]; |
7bc570c8 | 627 | struct net_device *dev; |
1d6e55f1 | 628 | struct inet6_dev *in6_dev; |
5ae7b444 | 629 | int err; |
7bc570c8 YH |
630 | |
631 | /* Is vif busy ? */ | |
8229efda | 632 | if (MIF_EXISTS(net, vifi)) |
7bc570c8 YH |
633 | return -EADDRINUSE; |
634 | ||
635 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
636 | #ifdef CONFIG_IPV6_PIMSM_V2 |
637 | case MIFF_REGISTER: | |
638 | /* | |
639 | * Special Purpose VIF in PIM | |
640 | * All the packets will be sent to the daemon | |
641 | */ | |
8229efda | 642 | if (net->ipv6.mroute_reg_vif_num >= 0) |
14fb64e1 | 643 | return -EADDRINUSE; |
8229efda | 644 | dev = ip6mr_reg_vif(net); |
14fb64e1 YH |
645 | if (!dev) |
646 | return -ENOBUFS; | |
5ae7b444 WC |
647 | err = dev_set_allmulti(dev, 1); |
648 | if (err) { | |
649 | unregister_netdevice(dev); | |
7af3db78 | 650 | dev_put(dev); |
5ae7b444 WC |
651 | return err; |
652 | } | |
14fb64e1 YH |
653 | break; |
654 | #endif | |
7bc570c8 | 655 | case 0: |
8229efda | 656 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
657 | if (!dev) |
658 | return -EADDRNOTAVAIL; | |
5ae7b444 | 659 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
660 | if (err) { |
661 | dev_put(dev); | |
5ae7b444 | 662 | return err; |
7af3db78 | 663 | } |
7bc570c8 YH |
664 | break; |
665 | default: | |
666 | return -EINVAL; | |
667 | } | |
668 | ||
1d6e55f1 TG |
669 | in6_dev = __in6_dev_get(dev); |
670 | if (in6_dev) | |
671 | in6_dev->cnf.mc_forwarding++; | |
672 | ||
7bc570c8 YH |
673 | /* |
674 | * Fill in the VIF structures | |
675 | */ | |
676 | v->rate_limit = vifc->vifc_rate_limit; | |
677 | v->flags = vifc->mif6c_flags; | |
678 | if (!mrtsock) | |
679 | v->flags |= VIFF_STATIC; | |
680 | v->threshold = vifc->vifc_threshold; | |
681 | v->bytes_in = 0; | |
682 | v->bytes_out = 0; | |
683 | v->pkt_in = 0; | |
684 | v->pkt_out = 0; | |
685 | v->link = dev->ifindex; | |
686 | if (v->flags & MIFF_REGISTER) | |
687 | v->link = dev->iflink; | |
688 | ||
689 | /* And finish update writing critical data */ | |
690 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 691 | v->dev = dev; |
14fb64e1 YH |
692 | #ifdef CONFIG_IPV6_PIMSM_V2 |
693 | if (v->flags & MIFF_REGISTER) | |
8229efda | 694 | net->ipv6.mroute_reg_vif_num = vifi; |
14fb64e1 | 695 | #endif |
8229efda BT |
696 | if (vifi + 1 > net->ipv6.maxvif) |
697 | net->ipv6.maxvif = vifi + 1; | |
7bc570c8 YH |
698 | write_unlock_bh(&mrt_lock); |
699 | return 0; | |
700 | } | |
701 | ||
8229efda BT |
702 | static struct mfc6_cache *ip6mr_cache_find(struct net *net, |
703 | struct in6_addr *origin, | |
704 | struct in6_addr *mcastgrp) | |
7bc570c8 YH |
705 | { |
706 | int line = MFC6_HASH(mcastgrp, origin); | |
707 | struct mfc6_cache *c; | |
708 | ||
8229efda | 709 | for (c = net->ipv6.mfc6_cache_array[line]; c; c = c->next) { |
7bc570c8 YH |
710 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
711 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
712 | break; | |
713 | } | |
714 | return c; | |
715 | } | |
716 | ||
717 | /* | |
718 | * Allocate a multicast cache entry | |
719 | */ | |
b5aa30b1 | 720 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
7bc570c8 | 721 | { |
36cbac59 | 722 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
723 | if (c == NULL) |
724 | return NULL; | |
6ac7eb08 | 725 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
726 | return c; |
727 | } | |
728 | ||
b5aa30b1 | 729 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
7bc570c8 | 730 | { |
36cbac59 | 731 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
732 | if (c == NULL) |
733 | return NULL; | |
7bc570c8 YH |
734 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
735 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
736 | return c; | |
737 | } | |
738 | ||
739 | /* | |
740 | * A cache entry has gone into a resolved state from queued | |
741 | */ | |
742 | ||
b5aa30b1 PM |
743 | static void ip6mr_cache_resolve(struct net *net, struct mfc6_cache *uc, |
744 | struct mfc6_cache *c) | |
7bc570c8 YH |
745 | { |
746 | struct sk_buff *skb; | |
747 | ||
748 | /* | |
749 | * Play the pending entries through our router | |
750 | */ | |
751 | ||
752 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
753 | if (ipv6_hdr(skb)->version == 0) { | |
754 | int err; | |
755 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
756 | ||
b5aa30b1 | 757 | if (ip6mr_fill_mroute(net, skb, c, NLMSG_DATA(nlh)) > 0) { |
549e028d | 758 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
759 | } else { |
760 | nlh->nlmsg_type = NLMSG_ERROR; | |
761 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
762 | skb_trim(skb, nlh->nlmsg_len); | |
763 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
764 | } | |
b5aa30b1 | 765 | err = rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 | 766 | } else |
b5aa30b1 | 767 | ip6_mr_forward(net, skb, c); |
7bc570c8 YH |
768 | } |
769 | } | |
770 | ||
771 | /* | |
772 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
773 | * expects the following bizarre scheme. | |
774 | * | |
775 | * Called under mrt_lock. | |
776 | */ | |
777 | ||
8229efda BT |
778 | static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, mifi_t mifi, |
779 | int assert) | |
7bc570c8 YH |
780 | { |
781 | struct sk_buff *skb; | |
782 | struct mrt6msg *msg; | |
783 | int ret; | |
784 | ||
14fb64e1 YH |
785 | #ifdef CONFIG_IPV6_PIMSM_V2 |
786 | if (assert == MRT6MSG_WHOLEPKT) | |
787 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
788 | +sizeof(*msg)); | |
789 | else | |
790 | #endif | |
791 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
792 | |
793 | if (!skb) | |
794 | return -ENOBUFS; | |
795 | ||
796 | /* I suppose that internal messages | |
797 | * do not require checksums */ | |
798 | ||
799 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
800 | ||
14fb64e1 YH |
801 | #ifdef CONFIG_IPV6_PIMSM_V2 |
802 | if (assert == MRT6MSG_WHOLEPKT) { | |
803 | /* Ugly, but we have no choice with this interface. | |
804 | Duplicate old header, fix length etc. | |
805 | And all this only to mangle msg->im6_msgtype and | |
806 | to set msg->im6_mbz to "mbz" :-) | |
807 | */ | |
808 | skb_push(skb, -skb_network_offset(pkt)); | |
809 | ||
810 | skb_push(skb, sizeof(*msg)); | |
811 | skb_reset_transport_header(skb); | |
812 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
813 | msg->im6_mbz = 0; | |
814 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
8229efda | 815 | msg->im6_mif = net->ipv6.mroute_reg_vif_num; |
14fb64e1 YH |
816 | msg->im6_pad = 0; |
817 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
818 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
819 | ||
820 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
821 | } else | |
822 | #endif | |
823 | { | |
7bc570c8 YH |
824 | /* |
825 | * Copy the IP header | |
826 | */ | |
827 | ||
828 | skb_put(skb, sizeof(struct ipv6hdr)); | |
829 | skb_reset_network_header(skb); | |
830 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
831 | ||
832 | /* | |
833 | * Add our header | |
834 | */ | |
835 | skb_put(skb, sizeof(*msg)); | |
836 | skb_reset_transport_header(skb); | |
837 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
838 | ||
839 | msg->im6_mbz = 0; | |
840 | msg->im6_msgtype = assert; | |
6ac7eb08 | 841 | msg->im6_mif = mifi; |
7bc570c8 YH |
842 | msg->im6_pad = 0; |
843 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
844 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
845 | ||
adf30907 | 846 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 847 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 848 | } |
7bc570c8 | 849 | |
8229efda | 850 | if (net->ipv6.mroute6_sk == NULL) { |
7bc570c8 YH |
851 | kfree_skb(skb); |
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | /* | |
856 | * Deliver to user space multicast routing algorithms | |
857 | */ | |
8229efda | 858 | ret = sock_queue_rcv_skb(net->ipv6.mroute6_sk, skb); |
bd91b8bf | 859 | if (ret < 0) { |
7bc570c8 YH |
860 | if (net_ratelimit()) |
861 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
862 | kfree_skb(skb); | |
863 | } | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
868 | /* | |
869 | * Queue a packet for resolution. It gets locked cache entry! | |
870 | */ | |
871 | ||
872 | static int | |
8229efda | 873 | ip6mr_cache_unresolved(struct net *net, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 YH |
874 | { |
875 | int err; | |
876 | struct mfc6_cache *c; | |
877 | ||
878 | spin_lock_bh(&mfc_unres_lock); | |
c476efbc PM |
879 | for (c = net->ipv6.mfc6_unres_queue; c; c = c->next) { |
880 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && | |
7bc570c8 YH |
881 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) |
882 | break; | |
883 | } | |
884 | ||
885 | if (c == NULL) { | |
886 | /* | |
887 | * Create a new entry if allowable | |
888 | */ | |
889 | ||
8229efda | 890 | if (atomic_read(&net->ipv6.cache_resolve_queue_len) >= 10 || |
b5aa30b1 | 891 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
7bc570c8 YH |
892 | spin_unlock_bh(&mfc_unres_lock); |
893 | ||
894 | kfree_skb(skb); | |
895 | return -ENOBUFS; | |
896 | } | |
897 | ||
898 | /* | |
899 | * Fill in the new cache entry | |
900 | */ | |
901 | c->mf6c_parent = -1; | |
902 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
903 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
904 | ||
905 | /* | |
906 | * Reflect first query at pim6sd | |
907 | */ | |
8229efda BT |
908 | err = ip6mr_cache_report(net, skb, mifi, MRT6MSG_NOCACHE); |
909 | if (err < 0) { | |
7bc570c8 YH |
910 | /* If the report failed throw the cache entry |
911 | out - Brad Parker | |
912 | */ | |
913 | spin_unlock_bh(&mfc_unres_lock); | |
914 | ||
58701ad4 | 915 | ip6mr_cache_free(c); |
7bc570c8 YH |
916 | kfree_skb(skb); |
917 | return err; | |
918 | } | |
919 | ||
8229efda | 920 | atomic_inc(&net->ipv6.cache_resolve_queue_len); |
c476efbc PM |
921 | c->next = net->ipv6.mfc6_unres_queue; |
922 | net->ipv6.mfc6_unres_queue = c; | |
7bc570c8 | 923 | |
c476efbc | 924 | ipmr_do_expire_process(net); |
7bc570c8 YH |
925 | } |
926 | ||
927 | /* | |
928 | * See if we can append the packet | |
929 | */ | |
930 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
931 | kfree_skb(skb); | |
932 | err = -ENOBUFS; | |
933 | } else { | |
934 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
935 | err = 0; | |
936 | } | |
937 | ||
938 | spin_unlock_bh(&mfc_unres_lock); | |
939 | return err; | |
940 | } | |
941 | ||
942 | /* | |
943 | * MFC6 cache manipulation by user space | |
944 | */ | |
945 | ||
8229efda | 946 | static int ip6mr_mfc_delete(struct net *net, struct mf6cctl *mfc) |
7bc570c8 YH |
947 | { |
948 | int line; | |
949 | struct mfc6_cache *c, **cp; | |
950 | ||
951 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
952 | ||
8229efda | 953 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 954 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
955 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
956 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
957 | write_lock_bh(&mrt_lock); | |
958 | *cp = c->next; | |
959 | write_unlock_bh(&mrt_lock); | |
960 | ||
58701ad4 | 961 | ip6mr_cache_free(c); |
7bc570c8 YH |
962 | return 0; |
963 | } | |
964 | } | |
965 | return -ENOENT; | |
966 | } | |
967 | ||
968 | static int ip6mr_device_event(struct notifier_block *this, | |
969 | unsigned long event, void *ptr) | |
970 | { | |
971 | struct net_device *dev = ptr; | |
8229efda | 972 | struct net *net = dev_net(dev); |
7bc570c8 YH |
973 | struct mif_device *v; |
974 | int ct; | |
c871e664 | 975 | LIST_HEAD(list); |
7bc570c8 | 976 | |
7bc570c8 YH |
977 | if (event != NETDEV_UNREGISTER) |
978 | return NOTIFY_DONE; | |
979 | ||
8229efda BT |
980 | v = &net->ipv6.vif6_table[0]; |
981 | for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) { | |
7bc570c8 | 982 | if (v->dev == dev) |
c871e664 | 983 | mif6_delete(net, ct, &list); |
7bc570c8 | 984 | } |
c871e664 ED |
985 | unregister_netdevice_many(&list); |
986 | ||
7bc570c8 YH |
987 | return NOTIFY_DONE; |
988 | } | |
989 | ||
990 | static struct notifier_block ip6_mr_notifier = { | |
991 | .notifier_call = ip6mr_device_event | |
992 | }; | |
993 | ||
994 | /* | |
995 | * Setup for IP multicast routing | |
996 | */ | |
997 | ||
4e16880c BT |
998 | static int __net_init ip6mr_net_init(struct net *net) |
999 | { | |
1000 | int err = 0; | |
4e16880c BT |
1001 | net->ipv6.vif6_table = kcalloc(MAXMIFS, sizeof(struct mif_device), |
1002 | GFP_KERNEL); | |
1003 | if (!net->ipv6.vif6_table) { | |
1004 | err = -ENOMEM; | |
1005 | goto fail; | |
1006 | } | |
4a6258a0 BT |
1007 | |
1008 | /* Forwarding cache */ | |
1009 | net->ipv6.mfc6_cache_array = kcalloc(MFC6_LINES, | |
1010 | sizeof(struct mfc6_cache *), | |
1011 | GFP_KERNEL); | |
1012 | if (!net->ipv6.mfc6_cache_array) { | |
1013 | err = -ENOMEM; | |
1014 | goto fail_mfc6_cache; | |
1015 | } | |
950d5704 | 1016 | |
c476efbc PM |
1017 | setup_timer(&net->ipv6.ipmr_expire_timer, ipmr_expire_process, |
1018 | (unsigned long)net); | |
1019 | ||
950d5704 BT |
1020 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1021 | net->ipv6.mroute_reg_vif_num = -1; | |
1022 | #endif | |
8b90fc7e BT |
1023 | |
1024 | #ifdef CONFIG_PROC_FS | |
1025 | err = -ENOMEM; | |
1026 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1027 | goto proc_vif_fail; | |
1028 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1029 | goto proc_cache_fail; | |
1030 | #endif | |
4a6258a0 BT |
1031 | return 0; |
1032 | ||
8b90fc7e BT |
1033 | #ifdef CONFIG_PROC_FS |
1034 | proc_cache_fail: | |
1035 | proc_net_remove(net, "ip6_mr_vif"); | |
1036 | proc_vif_fail: | |
1037 | kfree(net->ipv6.mfc6_cache_array); | |
1038 | #endif | |
4a6258a0 BT |
1039 | fail_mfc6_cache: |
1040 | kfree(net->ipv6.vif6_table); | |
4e16880c BT |
1041 | fail: |
1042 | return err; | |
1043 | } | |
1044 | ||
1045 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1046 | { | |
8b90fc7e BT |
1047 | #ifdef CONFIG_PROC_FS |
1048 | proc_net_remove(net, "ip6_mr_cache"); | |
1049 | proc_net_remove(net, "ip6_mr_vif"); | |
1050 | #endif | |
c476efbc | 1051 | del_timer(&net->ipv6.ipmr_expire_timer); |
8229efda | 1052 | mroute_clean_tables(net); |
4a6258a0 | 1053 | kfree(net->ipv6.mfc6_cache_array); |
4e16880c BT |
1054 | kfree(net->ipv6.vif6_table); |
1055 | } | |
1056 | ||
1057 | static struct pernet_operations ip6mr_net_ops = { | |
1058 | .init = ip6mr_net_init, | |
1059 | .exit = ip6mr_net_exit, | |
1060 | }; | |
1061 | ||
623d1a1a | 1062 | int __init ip6_mr_init(void) |
7bc570c8 | 1063 | { |
623d1a1a WC |
1064 | int err; |
1065 | ||
7bc570c8 YH |
1066 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1067 | sizeof(struct mfc6_cache), | |
1068 | 0, SLAB_HWCACHE_ALIGN, | |
1069 | NULL); | |
1070 | if (!mrt_cachep) | |
623d1a1a | 1071 | return -ENOMEM; |
7bc570c8 | 1072 | |
4e16880c BT |
1073 | err = register_pernet_subsys(&ip6mr_net_ops); |
1074 | if (err) | |
1075 | goto reg_pernet_fail; | |
1076 | ||
623d1a1a WC |
1077 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1078 | if (err) | |
1079 | goto reg_notif_fail; | |
403dbb97 TG |
1080 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1081 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
1082 | printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); | |
1083 | err = -EAGAIN; | |
1084 | goto add_proto_fail; | |
1085 | } | |
1086 | #endif | |
623d1a1a | 1087 | return 0; |
403dbb97 TG |
1088 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1089 | add_proto_fail: | |
1090 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1091 | #endif | |
87b30a65 | 1092 | reg_notif_fail: |
4e16880c BT |
1093 | unregister_pernet_subsys(&ip6mr_net_ops); |
1094 | reg_pernet_fail: | |
87b30a65 | 1095 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1096 | return err; |
7bc570c8 YH |
1097 | } |
1098 | ||
623d1a1a WC |
1099 | void ip6_mr_cleanup(void) |
1100 | { | |
623d1a1a | 1101 | unregister_netdevice_notifier(&ip6_mr_notifier); |
4e16880c | 1102 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1103 | kmem_cache_destroy(mrt_cachep); |
1104 | } | |
7bc570c8 | 1105 | |
8229efda | 1106 | static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock) |
7bc570c8 YH |
1107 | { |
1108 | int line; | |
1109 | struct mfc6_cache *uc, *c, **cp; | |
6ac7eb08 | 1110 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1111 | int i; |
1112 | ||
a50436f2 PM |
1113 | if (mfc->mf6cc_parent >= MAXMIFS) |
1114 | return -ENFILE; | |
1115 | ||
6ac7eb08 RR |
1116 | memset(ttls, 255, MAXMIFS); |
1117 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1118 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1119 | ttls[i] = 1; | |
1120 | ||
1121 | } | |
1122 | ||
1123 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1124 | ||
8229efda | 1125 | for (cp = &net->ipv6.mfc6_cache_array[line]; |
4a6258a0 | 1126 | (c = *cp) != NULL; cp = &c->next) { |
7bc570c8 YH |
1127 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1128 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) | |
1129 | break; | |
1130 | } | |
1131 | ||
1132 | if (c != NULL) { | |
1133 | write_lock_bh(&mrt_lock); | |
1134 | c->mf6c_parent = mfc->mf6cc_parent; | |
b5aa30b1 | 1135 | ip6mr_update_thresholds(net, c, ttls); |
7bc570c8 YH |
1136 | if (!mrtsock) |
1137 | c->mfc_flags |= MFC_STATIC; | |
1138 | write_unlock_bh(&mrt_lock); | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1143 | return -EINVAL; | |
1144 | ||
b5aa30b1 | 1145 | c = ip6mr_cache_alloc(); |
7bc570c8 YH |
1146 | if (c == NULL) |
1147 | return -ENOMEM; | |
1148 | ||
1149 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1150 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1151 | c->mf6c_parent = mfc->mf6cc_parent; | |
b5aa30b1 | 1152 | ip6mr_update_thresholds(net, c, ttls); |
7bc570c8 YH |
1153 | if (!mrtsock) |
1154 | c->mfc_flags |= MFC_STATIC; | |
1155 | ||
1156 | write_lock_bh(&mrt_lock); | |
8229efda BT |
1157 | c->next = net->ipv6.mfc6_cache_array[line]; |
1158 | net->ipv6.mfc6_cache_array[line] = c; | |
7bc570c8 YH |
1159 | write_unlock_bh(&mrt_lock); |
1160 | ||
1161 | /* | |
1162 | * Check to see if we resolved a queued list. If so we | |
1163 | * need to send on the frames and tidy up. | |
1164 | */ | |
1165 | spin_lock_bh(&mfc_unres_lock); | |
c476efbc | 1166 | for (cp = &net->ipv6.mfc6_unres_queue; (uc = *cp) != NULL; |
7bc570c8 | 1167 | cp = &uc->next) { |
c476efbc | 1168 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 YH |
1169 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
1170 | *cp = uc->next; | |
8229efda | 1171 | atomic_dec(&net->ipv6.cache_resolve_queue_len); |
7bc570c8 YH |
1172 | break; |
1173 | } | |
1174 | } | |
c476efbc PM |
1175 | if (net->ipv6.mfc6_unres_queue == NULL) |
1176 | del_timer(&net->ipv6.ipmr_expire_timer); | |
7bc570c8 YH |
1177 | spin_unlock_bh(&mfc_unres_lock); |
1178 | ||
1179 | if (uc) { | |
b5aa30b1 | 1180 | ip6mr_cache_resolve(net, uc, c); |
58701ad4 | 1181 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1182 | } |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Close the multicast socket, and clear the vif tables etc | |
1188 | */ | |
1189 | ||
8229efda | 1190 | static void mroute_clean_tables(struct net *net) |
7bc570c8 YH |
1191 | { |
1192 | int i; | |
c871e664 | 1193 | LIST_HEAD(list); |
7bc570c8 YH |
1194 | |
1195 | /* | |
1196 | * Shut down all active vif entries | |
1197 | */ | |
8229efda BT |
1198 | for (i = 0; i < net->ipv6.maxvif; i++) { |
1199 | if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC)) | |
c871e664 | 1200 | mif6_delete(net, i, &list); |
7bc570c8 | 1201 | } |
c871e664 | 1202 | unregister_netdevice_many(&list); |
7bc570c8 YH |
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); | |
c476efbc | 1228 | cp = &net->ipv6.mfc6_unres_queue; |
4045e57c | 1229 | while ((c = *cp) != NULL) { |
4045e57c | 1230 | *cp = c->next; |
b5aa30b1 | 1231 | ip6mr_destroy_unres(net, c); |
7bc570c8 YH |
1232 | } |
1233 | spin_unlock_bh(&mfc_unres_lock); | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | static int ip6mr_sk_init(struct sock *sk) | |
1238 | { | |
1239 | int err = 0; | |
8229efda | 1240 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1241 | |
1242 | rtnl_lock(); | |
1243 | write_lock_bh(&mrt_lock); | |
1d6e55f1 | 1244 | if (likely(net->ipv6.mroute6_sk == NULL)) { |
8229efda | 1245 | net->ipv6.mroute6_sk = sk; |
1d6e55f1 TG |
1246 | net->ipv6.devconf_all->mc_forwarding++; |
1247 | } | |
7bc570c8 YH |
1248 | else |
1249 | err = -EADDRINUSE; | |
1250 | write_unlock_bh(&mrt_lock); | |
1251 | ||
1252 | rtnl_unlock(); | |
1253 | ||
1254 | return err; | |
1255 | } | |
1256 | ||
1257 | int ip6mr_sk_done(struct sock *sk) | |
1258 | { | |
1259 | int err = 0; | |
8229efda | 1260 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1261 | |
1262 | rtnl_lock(); | |
8229efda | 1263 | if (sk == net->ipv6.mroute6_sk) { |
7bc570c8 | 1264 | write_lock_bh(&mrt_lock); |
8229efda | 1265 | net->ipv6.mroute6_sk = NULL; |
1d6e55f1 | 1266 | net->ipv6.devconf_all->mc_forwarding--; |
7bc570c8 YH |
1267 | write_unlock_bh(&mrt_lock); |
1268 | ||
8229efda | 1269 | mroute_clean_tables(net); |
7bc570c8 YH |
1270 | } else |
1271 | err = -EACCES; | |
1272 | rtnl_unlock(); | |
1273 | ||
1274 | return err; | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * Socket options and virtual interface manipulation. The whole | |
1279 | * virtual interface system is a complete heap, but unfortunately | |
1280 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1281 | * MOSPF/PIM router set up we can clean this up. | |
1282 | */ | |
1283 | ||
b7058842 | 1284 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1285 | { |
1286 | int ret; | |
1287 | struct mif6ctl vif; | |
1288 | struct mf6cctl mfc; | |
1289 | mifi_t mifi; | |
8229efda | 1290 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1291 | |
1292 | if (optname != MRT6_INIT) { | |
8229efda | 1293 | if (sk != net->ipv6.mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1294 | return -EACCES; |
1295 | } | |
1296 | ||
1297 | switch (optname) { | |
1298 | case MRT6_INIT: | |
1299 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1300 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1301 | return -EOPNOTSUPP; |
1302 | if (optlen < sizeof(int)) | |
1303 | return -EINVAL; | |
1304 | ||
1305 | return ip6mr_sk_init(sk); | |
1306 | ||
1307 | case MRT6_DONE: | |
1308 | return ip6mr_sk_done(sk); | |
1309 | ||
1310 | case MRT6_ADD_MIF: | |
1311 | if (optlen < sizeof(vif)) | |
1312 | return -EINVAL; | |
1313 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1314 | return -EFAULT; | |
6ac7eb08 | 1315 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1316 | return -ENFILE; |
1317 | rtnl_lock(); | |
8229efda | 1318 | ret = mif6_add(net, &vif, sk == net->ipv6.mroute6_sk); |
7bc570c8 YH |
1319 | rtnl_unlock(); |
1320 | return ret; | |
1321 | ||
1322 | case MRT6_DEL_MIF: | |
1323 | if (optlen < sizeof(mifi_t)) | |
1324 | return -EINVAL; | |
1325 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1326 | return -EFAULT; | |
1327 | rtnl_lock(); | |
c871e664 | 1328 | ret = mif6_delete(net, mifi, NULL); |
7bc570c8 YH |
1329 | rtnl_unlock(); |
1330 | return ret; | |
1331 | ||
1332 | /* | |
1333 | * Manipulate the forwarding caches. These live | |
1334 | * in a sort of kernel/user symbiosis. | |
1335 | */ | |
1336 | case MRT6_ADD_MFC: | |
1337 | case MRT6_DEL_MFC: | |
1338 | if (optlen < sizeof(mfc)) | |
1339 | return -EINVAL; | |
1340 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1341 | return -EFAULT; | |
1342 | rtnl_lock(); | |
1343 | if (optname == MRT6_DEL_MFC) | |
8229efda | 1344 | ret = ip6mr_mfc_delete(net, &mfc); |
7bc570c8 | 1345 | else |
8229efda BT |
1346 | ret = ip6mr_mfc_add(net, &mfc, |
1347 | sk == net->ipv6.mroute6_sk); | |
7bc570c8 YH |
1348 | rtnl_unlock(); |
1349 | return ret; | |
1350 | ||
14fb64e1 YH |
1351 | /* |
1352 | * Control PIM assert (to activate pim will activate assert) | |
1353 | */ | |
1354 | case MRT6_ASSERT: | |
1355 | { | |
1356 | int v; | |
1357 | if (get_user(v, (int __user *)optval)) | |
1358 | return -EFAULT; | |
8229efda | 1359 | net->ipv6.mroute_do_assert = !!v; |
14fb64e1 YH |
1360 | return 0; |
1361 | } | |
1362 | ||
1363 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1364 | case MRT6_PIM: | |
1365 | { | |
a9f83bf3 | 1366 | int v; |
14fb64e1 YH |
1367 | if (get_user(v, (int __user *)optval)) |
1368 | return -EFAULT; | |
1369 | v = !!v; | |
1370 | rtnl_lock(); | |
1371 | ret = 0; | |
8229efda BT |
1372 | if (v != net->ipv6.mroute_do_pim) { |
1373 | net->ipv6.mroute_do_pim = v; | |
1374 | net->ipv6.mroute_do_assert = v; | |
14fb64e1 YH |
1375 | } |
1376 | rtnl_unlock(); | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | #endif | |
7bc570c8 | 1381 | /* |
7d120c55 | 1382 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1383 | * set. |
1384 | */ | |
1385 | default: | |
1386 | return -ENOPROTOOPT; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Getsock opt support for the multicast routing system. | |
1392 | */ | |
1393 | ||
1394 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1395 | int __user *optlen) | |
1396 | { | |
1397 | int olr; | |
1398 | int val; | |
8229efda | 1399 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1400 | |
1401 | switch (optname) { | |
1402 | case MRT6_VERSION: | |
1403 | val = 0x0305; | |
1404 | break; | |
14fb64e1 YH |
1405 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1406 | case MRT6_PIM: | |
8229efda | 1407 | val = net->ipv6.mroute_do_pim; |
14fb64e1 YH |
1408 | break; |
1409 | #endif | |
1410 | case MRT6_ASSERT: | |
8229efda | 1411 | val = net->ipv6.mroute_do_assert; |
14fb64e1 | 1412 | break; |
7bc570c8 YH |
1413 | default: |
1414 | return -ENOPROTOOPT; | |
1415 | } | |
1416 | ||
1417 | if (get_user(olr, optlen)) | |
1418 | return -EFAULT; | |
1419 | ||
1420 | olr = min_t(int, olr, sizeof(int)); | |
1421 | if (olr < 0) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | if (put_user(olr, optlen)) | |
1425 | return -EFAULT; | |
1426 | if (copy_to_user(optval, &val, olr)) | |
1427 | return -EFAULT; | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * The IP multicast ioctl support routines. | |
1433 | */ | |
1434 | ||
1435 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1436 | { | |
1437 | struct sioc_sg_req6 sr; | |
1438 | struct sioc_mif_req6 vr; | |
1439 | struct mif_device *vif; | |
1440 | struct mfc6_cache *c; | |
8229efda | 1441 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1442 | |
1443 | switch (cmd) { | |
1444 | case SIOCGETMIFCNT_IN6: | |
1445 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1446 | return -EFAULT; | |
8229efda | 1447 | if (vr.mifi >= net->ipv6.maxvif) |
7bc570c8 YH |
1448 | return -EINVAL; |
1449 | read_lock(&mrt_lock); | |
8229efda BT |
1450 | vif = &net->ipv6.vif6_table[vr.mifi]; |
1451 | if (MIF_EXISTS(net, vr.mifi)) { | |
7bc570c8 YH |
1452 | vr.icount = vif->pkt_in; |
1453 | vr.ocount = vif->pkt_out; | |
1454 | vr.ibytes = vif->bytes_in; | |
1455 | vr.obytes = vif->bytes_out; | |
1456 | read_unlock(&mrt_lock); | |
1457 | ||
1458 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1459 | return -EFAULT; | |
1460 | return 0; | |
1461 | } | |
1462 | read_unlock(&mrt_lock); | |
1463 | return -EADDRNOTAVAIL; | |
1464 | case SIOCGETSGCNT_IN6: | |
1465 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1466 | return -EFAULT; | |
1467 | ||
1468 | read_lock(&mrt_lock); | |
8229efda | 1469 | c = ip6mr_cache_find(net, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1470 | if (c) { |
1471 | sr.pktcnt = c->mfc_un.res.pkt; | |
1472 | sr.bytecnt = c->mfc_un.res.bytes; | |
1473 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1474 | read_unlock(&mrt_lock); | |
1475 | ||
1476 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1477 | return -EFAULT; | |
1478 | return 0; | |
1479 | } | |
1480 | read_unlock(&mrt_lock); | |
1481 | return -EADDRNOTAVAIL; | |
1482 | default: | |
1483 | return -ENOIOCTLCMD; | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | ||
1488 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1489 | { | |
adf30907 | 1490 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1491 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1492 | return dst_output(skb); |
1493 | } | |
1494 | ||
1495 | /* | |
1496 | * Processing handlers for ip6mr_forward | |
1497 | */ | |
1498 | ||
b5aa30b1 PM |
1499 | static int ip6mr_forward2(struct net *net, struct sk_buff *skb, |
1500 | struct mfc6_cache *c, int vifi) | |
7bc570c8 YH |
1501 | { |
1502 | struct ipv6hdr *ipv6h; | |
8229efda | 1503 | struct mif_device *vif = &net->ipv6.vif6_table[vifi]; |
7bc570c8 YH |
1504 | struct net_device *dev; |
1505 | struct dst_entry *dst; | |
1506 | struct flowi fl; | |
1507 | ||
1508 | if (vif->dev == NULL) | |
1509 | goto out_free; | |
1510 | ||
14fb64e1 YH |
1511 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1512 | if (vif->flags & MIFF_REGISTER) { | |
1513 | vif->pkt_out++; | |
1514 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1515 | vif->dev->stats.tx_bytes += skb->len; |
1516 | vif->dev->stats.tx_packets++; | |
8229efda | 1517 | ip6mr_cache_report(net, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1518 | goto out_free; |
14fb64e1 YH |
1519 | } |
1520 | #endif | |
1521 | ||
7bc570c8 YH |
1522 | ipv6h = ipv6_hdr(skb); |
1523 | ||
1524 | fl = (struct flowi) { | |
1525 | .oif = vif->link, | |
1526 | .nl_u = { .ip6_u = | |
1527 | { .daddr = ipv6h->daddr, } | |
1528 | } | |
1529 | }; | |
1530 | ||
8229efda | 1531 | dst = ip6_route_output(net, NULL, &fl); |
7bc570c8 YH |
1532 | if (!dst) |
1533 | goto out_free; | |
1534 | ||
adf30907 ED |
1535 | skb_dst_drop(skb); |
1536 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1537 | |
1538 | /* | |
1539 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1540 | * not only before forwarding, but after forwarding on all output | |
1541 | * interfaces. It is clear, if mrouter runs a multicasting | |
1542 | * program, it should receive packets not depending to what interface | |
1543 | * program is joined. | |
1544 | * If we will not make it, the program will have to join on all | |
1545 | * interfaces. On the other hand, multihoming host (or router, but | |
1546 | * not mrouter) cannot join to more than one interface - it will | |
1547 | * result in receiving multiple packets. | |
1548 | */ | |
1549 | dev = vif->dev; | |
1550 | skb->dev = dev; | |
1551 | vif->pkt_out++; | |
1552 | vif->bytes_out += skb->len; | |
1553 | ||
1554 | /* We are about to write */ | |
1555 | /* XXX: extension headers? */ | |
1556 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1557 | goto out_free; | |
1558 | ||
1559 | ipv6h = ipv6_hdr(skb); | |
1560 | ipv6h->hop_limit--; | |
1561 | ||
1562 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1563 | ||
b2e0b385 | 1564 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1565 | ip6mr_forward2_finish); |
1566 | ||
1567 | out_free: | |
1568 | kfree_skb(skb); | |
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | static int ip6mr_find_vif(struct net_device *dev) | |
1573 | { | |
8229efda | 1574 | struct net *net = dev_net(dev); |
7bc570c8 | 1575 | int ct; |
8229efda BT |
1576 | for (ct = net->ipv6.maxvif - 1; ct >= 0; ct--) { |
1577 | if (net->ipv6.vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1578 | break; |
1579 | } | |
1580 | return ct; | |
1581 | } | |
1582 | ||
b5aa30b1 PM |
1583 | static int ip6_mr_forward(struct net *net, struct sk_buff *skb, |
1584 | struct mfc6_cache *cache) | |
7bc570c8 YH |
1585 | { |
1586 | int psend = -1; | |
1587 | int vif, ct; | |
1588 | ||
1589 | vif = cache->mf6c_parent; | |
1590 | cache->mfc_un.res.pkt++; | |
1591 | cache->mfc_un.res.bytes += skb->len; | |
1592 | ||
14fb64e1 YH |
1593 | /* |
1594 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1595 | */ | |
8229efda | 1596 | if (net->ipv6.vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1597 | int true_vifi; |
1598 | ||
1599 | cache->mfc_un.res.wrong_if++; | |
1600 | true_vifi = ip6mr_find_vif(skb->dev); | |
1601 | ||
8229efda | 1602 | if (true_vifi >= 0 && net->ipv6.mroute_do_assert && |
14fb64e1 YH |
1603 | /* pimsm uses asserts, when switching from RPT to SPT, |
1604 | so that we cannot check that packet arrived on an oif. | |
1605 | It is bad, but otherwise we would need to move pretty | |
1606 | large chunk of pimd to kernel. Ough... --ANK | |
1607 | */ | |
8229efda | 1608 | (net->ipv6.mroute_do_pim || |
a21f3f99 | 1609 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
1610 | time_after(jiffies, |
1611 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1612 | cache->mfc_un.res.last_assert = jiffies; | |
8229efda | 1613 | ip6mr_cache_report(net, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
1614 | } |
1615 | goto dont_forward; | |
1616 | } | |
1617 | ||
8229efda BT |
1618 | net->ipv6.vif6_table[vif].pkt_in++; |
1619 | net->ipv6.vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
1620 | |
1621 | /* | |
1622 | * Forward the frame | |
1623 | */ | |
1624 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1625 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1626 | if (psend != -1) { | |
1627 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1628 | if (skb2) | |
b5aa30b1 | 1629 | ip6mr_forward2(net, skb2, cache, psend); |
7bc570c8 YH |
1630 | } |
1631 | psend = ct; | |
1632 | } | |
1633 | } | |
1634 | if (psend != -1) { | |
b5aa30b1 | 1635 | ip6mr_forward2(net, skb, cache, psend); |
7bc570c8 YH |
1636 | return 0; |
1637 | } | |
1638 | ||
14fb64e1 | 1639 | dont_forward: |
7bc570c8 YH |
1640 | kfree_skb(skb); |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | ||
1645 | /* | |
1646 | * Multicast packets for forwarding arrive here | |
1647 | */ | |
1648 | ||
1649 | int ip6_mr_input(struct sk_buff *skb) | |
1650 | { | |
1651 | struct mfc6_cache *cache; | |
8229efda | 1652 | struct net *net = dev_net(skb->dev); |
7bc570c8 YH |
1653 | |
1654 | read_lock(&mrt_lock); | |
8229efda BT |
1655 | cache = ip6mr_cache_find(net, |
1656 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); | |
7bc570c8 YH |
1657 | |
1658 | /* | |
1659 | * No usable cache entry | |
1660 | */ | |
1661 | if (cache == NULL) { | |
1662 | int vif; | |
1663 | ||
1664 | vif = ip6mr_find_vif(skb->dev); | |
1665 | if (vif >= 0) { | |
8229efda | 1666 | int err = ip6mr_cache_unresolved(net, vif, skb); |
7bc570c8 YH |
1667 | read_unlock(&mrt_lock); |
1668 | ||
1669 | return err; | |
1670 | } | |
1671 | read_unlock(&mrt_lock); | |
1672 | kfree_skb(skb); | |
1673 | return -ENODEV; | |
1674 | } | |
1675 | ||
b5aa30b1 | 1676 | ip6_mr_forward(net, skb, cache); |
7bc570c8 YH |
1677 | |
1678 | read_unlock(&mrt_lock); | |
1679 | ||
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | ||
1684 | static int | |
b5aa30b1 PM |
1685 | ip6mr_fill_mroute(struct net *net, struct sk_buff *skb, struct mfc6_cache *c, |
1686 | struct rtmsg *rtm) | |
7bc570c8 YH |
1687 | { |
1688 | int ct; | |
1689 | struct rtnexthop *nhp; | |
549e028d | 1690 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
1691 | struct rtattr *mp_head; |
1692 | ||
7438189b ND |
1693 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1694 | if (c->mf6c_parent > MAXMIFS) | |
1695 | return -ENOENT; | |
1696 | ||
1697 | if (MIF_EXISTS(net, c->mf6c_parent)) | |
1698 | RTA_PUT(skb, RTA_IIF, 4, &net->ipv6.vif6_table[c->mf6c_parent].dev->ifindex); | |
7bc570c8 YH |
1699 | |
1700 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
1701 | ||
1702 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
7438189b | 1703 | if (MIF_EXISTS(net, ct) && c->mfc_un.res.ttls[ct] < 255) { |
7bc570c8 YH |
1704 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1705 | goto rtattr_failure; | |
1706 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1707 | nhp->rtnh_flags = 0; | |
1708 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
8229efda | 1709 | nhp->rtnh_ifindex = net->ipv6.vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
1710 | nhp->rtnh_len = sizeof(*nhp); |
1711 | } | |
1712 | } | |
1713 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 1714 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
1715 | rtm->rtm_type = RTN_MULTICAST; |
1716 | return 1; | |
1717 | ||
1718 | rtattr_failure: | |
1719 | nlmsg_trim(skb, b); | |
1720 | return -EMSGSIZE; | |
1721 | } | |
1722 | ||
8229efda BT |
1723 | int ip6mr_get_route(struct net *net, |
1724 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
1725 | { |
1726 | int err; | |
1727 | struct mfc6_cache *cache; | |
adf30907 | 1728 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 YH |
1729 | |
1730 | read_lock(&mrt_lock); | |
8229efda | 1731 | cache = ip6mr_cache_find(net, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
1732 | |
1733 | if (!cache) { | |
1734 | struct sk_buff *skb2; | |
1735 | struct ipv6hdr *iph; | |
1736 | struct net_device *dev; | |
1737 | int vif; | |
1738 | ||
1739 | if (nowait) { | |
1740 | read_unlock(&mrt_lock); | |
1741 | return -EAGAIN; | |
1742 | } | |
1743 | ||
1744 | dev = skb->dev; | |
1745 | if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { | |
1746 | read_unlock(&mrt_lock); | |
1747 | return -ENODEV; | |
1748 | } | |
1749 | ||
1750 | /* really correct? */ | |
1751 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
1752 | if (!skb2) { | |
1753 | read_unlock(&mrt_lock); | |
1754 | return -ENOMEM; | |
1755 | } | |
1756 | ||
1757 | skb_reset_transport_header(skb2); | |
1758 | ||
1759 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
1760 | skb_reset_network_header(skb2); | |
1761 | ||
1762 | iph = ipv6_hdr(skb2); | |
1763 | iph->version = 0; | |
1764 | iph->priority = 0; | |
1765 | iph->flow_lbl[0] = 0; | |
1766 | iph->flow_lbl[1] = 0; | |
1767 | iph->flow_lbl[2] = 0; | |
1768 | iph->payload_len = 0; | |
1769 | iph->nexthdr = IPPROTO_NONE; | |
1770 | iph->hop_limit = 0; | |
1771 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
1772 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
1773 | ||
8229efda | 1774 | err = ip6mr_cache_unresolved(net, vif, skb2); |
7bc570c8 YH |
1775 | read_unlock(&mrt_lock); |
1776 | ||
1777 | return err; | |
1778 | } | |
1779 | ||
1780 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1781 | cache->mfc_flags |= MFC_NOTIFY; | |
1782 | ||
b5aa30b1 | 1783 | err = ip6mr_fill_mroute(net, skb, cache, rtm); |
7bc570c8 YH |
1784 | read_unlock(&mrt_lock); |
1785 | return err; | |
1786 | } | |
1787 |