]>
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> |
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 | |
6bd52143 PM |
54 | struct mr6_table { |
55 | #ifdef CONFIG_NET_NS | |
56 | struct net *net; | |
57 | #endif | |
58 | struct sock *mroute6_sk; | |
59 | struct timer_list ipmr_expire_timer; | |
60 | struct list_head mfc6_unres_queue; | |
61 | struct list_head mfc6_cache_array[MFC6_LINES]; | |
62 | struct mif_device vif6_table[MAXMIFS]; | |
63 | int maxvif; | |
64 | atomic_t cache_resolve_queue_len; | |
65 | int mroute_do_assert; | |
66 | int mroute_do_pim; | |
67 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
68 | int mroute_reg_vif_num; | |
69 | #endif | |
70 | }; | |
71 | ||
7bc570c8 YH |
72 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
73 | Note that the changes are semaphored via rtnl_lock. | |
74 | */ | |
75 | ||
76 | static DEFINE_RWLOCK(mrt_lock); | |
77 | ||
78 | /* | |
79 | * Multicast router control variables | |
80 | */ | |
81 | ||
6bd52143 | 82 | #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) |
7bc570c8 | 83 | |
7bc570c8 YH |
84 | /* Special spinlock for queue of unresolved entries */ |
85 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
86 | ||
87 | /* We return to original Alan's scheme. Hash table of resolved | |
88 | entries is changed only in process context and protected | |
89 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
90 | with strong spinlock mfc_unres_lock. | |
91 | ||
92 | In this case data path is free of exclusive locks at all. | |
93 | */ | |
94 | ||
95 | static struct kmem_cache *mrt_cachep __read_mostly; | |
96 | ||
6bd52143 PM |
97 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
98 | struct sk_buff *skb, struct mfc6_cache *cache); | |
99 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, | |
8229efda | 100 | mifi_t mifi, int assert); |
6bd52143 | 101 | static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
b5aa30b1 | 102 | struct mfc6_cache *c, struct rtmsg *rtm); |
6bd52143 | 103 | static void mroute_clean_tables(struct mr6_table *mrt); |
7bc570c8 | 104 | |
7bc570c8 YH |
105 | |
106 | #ifdef CONFIG_PROC_FS | |
107 | ||
108 | struct ipmr_mfc_iter { | |
8b90fc7e | 109 | struct seq_net_private p; |
f30a7784 | 110 | struct list_head *cache; |
7bc570c8 YH |
111 | int ct; |
112 | }; | |
113 | ||
114 | ||
8b90fc7e BT |
115 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
116 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 | 117 | { |
6bd52143 | 118 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
119 | struct mfc6_cache *mfc; |
120 | ||
7bc570c8 | 121 | read_lock(&mrt_lock); |
f30a7784 | 122 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { |
6bd52143 | 123 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 | 124 | list_for_each_entry(mfc, it->cache, list) |
7bc570c8 YH |
125 | if (pos-- == 0) |
126 | return mfc; | |
f30a7784 | 127 | } |
7bc570c8 YH |
128 | read_unlock(&mrt_lock); |
129 | ||
7bc570c8 | 130 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 131 | it->cache = &mrt->mfc6_unres_queue; |
f30a7784 | 132 | list_for_each_entry(mfc, it->cache, list) |
c476efbc | 133 | if (pos-- == 0) |
7bc570c8 YH |
134 | return mfc; |
135 | spin_unlock_bh(&mfc_unres_lock); | |
136 | ||
137 | it->cache = NULL; | |
138 | return NULL; | |
139 | } | |
140 | ||
7bc570c8 YH |
141 | /* |
142 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
143 | */ | |
144 | ||
145 | struct ipmr_vif_iter { | |
8b90fc7e | 146 | struct seq_net_private p; |
7bc570c8 YH |
147 | int ct; |
148 | }; | |
149 | ||
8b90fc7e BT |
150 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
151 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
152 | loff_t pos) |
153 | { | |
6bd52143 PM |
154 | struct mr6_table *mrt = net->ipv6.mrt6; |
155 | ||
156 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
157 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 YH |
158 | continue; |
159 | if (pos-- == 0) | |
6bd52143 | 160 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
161 | } |
162 | return NULL; | |
163 | } | |
164 | ||
165 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
166 | __acquires(mrt_lock) | |
167 | { | |
8b90fc7e BT |
168 | struct net *net = seq_file_net(seq); |
169 | ||
7bc570c8 | 170 | read_lock(&mrt_lock); |
8b90fc7e BT |
171 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
172 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
173 | } |
174 | ||
175 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
176 | { | |
177 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 178 | struct net *net = seq_file_net(seq); |
6bd52143 | 179 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
180 | |
181 | ++*pos; | |
182 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 183 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 184 | |
6bd52143 PM |
185 | while (++iter->ct < mrt->maxvif) { |
186 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 | 187 | continue; |
6bd52143 | 188 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
189 | } |
190 | return NULL; | |
191 | } | |
192 | ||
193 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
194 | __releases(mrt_lock) | |
195 | { | |
196 | read_unlock(&mrt_lock); | |
197 | } | |
198 | ||
199 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
200 | { | |
8b90fc7e | 201 | struct net *net = seq_file_net(seq); |
6bd52143 | 202 | struct mr6_table *mrt = net->ipv6.mrt6; |
8b90fc7e | 203 | |
7bc570c8 YH |
204 | if (v == SEQ_START_TOKEN) { |
205 | seq_puts(seq, | |
206 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
207 | } else { | |
208 | const struct mif_device *vif = v; | |
209 | const char *name = vif->dev ? vif->dev->name : "none"; | |
210 | ||
211 | seq_printf(seq, | |
d430a227 | 212 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
6bd52143 | 213 | vif - mrt->vif6_table, |
7bc570c8 YH |
214 | name, vif->bytes_in, vif->pkt_in, |
215 | vif->bytes_out, vif->pkt_out, | |
216 | vif->flags); | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
98147d52 | 221 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
222 | .start = ip6mr_vif_seq_start, |
223 | .next = ip6mr_vif_seq_next, | |
224 | .stop = ip6mr_vif_seq_stop, | |
225 | .show = ip6mr_vif_seq_show, | |
226 | }; | |
227 | ||
228 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
229 | { | |
8b90fc7e BT |
230 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
231 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
232 | } |
233 | ||
5ca1b998 | 234 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
235 | .owner = THIS_MODULE, |
236 | .open = ip6mr_vif_open, | |
237 | .read = seq_read, | |
238 | .llseek = seq_lseek, | |
8b90fc7e | 239 | .release = seq_release_net, |
7bc570c8 YH |
240 | }; |
241 | ||
242 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
243 | { | |
8b90fc7e BT |
244 | struct net *net = seq_file_net(seq); |
245 | ||
246 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) | |
247 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
248 | } |
249 | ||
250 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
251 | { | |
252 | struct mfc6_cache *mfc = v; | |
253 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 254 | struct net *net = seq_file_net(seq); |
6bd52143 | 255 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
256 | |
257 | ++*pos; | |
258 | ||
259 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 260 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 | 261 | |
f30a7784 PM |
262 | if (mfc->list.next != it->cache) |
263 | return list_entry(mfc->list.next, struct mfc6_cache, list); | |
7bc570c8 | 264 | |
6bd52143 | 265 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 YH |
266 | goto end_of_list; |
267 | ||
6bd52143 | 268 | BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); |
7bc570c8 | 269 | |
4a6258a0 | 270 | while (++it->ct < MFC6_LINES) { |
6bd52143 | 271 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 PM |
272 | if (list_empty(it->cache)) |
273 | continue; | |
274 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
275 | } |
276 | ||
277 | /* exhausted cache_array, show unresolved */ | |
278 | read_unlock(&mrt_lock); | |
6bd52143 | 279 | it->cache = &mrt->mfc6_unres_queue; |
7bc570c8 YH |
280 | it->ct = 0; |
281 | ||
282 | spin_lock_bh(&mfc_unres_lock); | |
f30a7784 PM |
283 | if (!list_empty(it->cache)) |
284 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
285 | |
286 | end_of_list: | |
287 | spin_unlock_bh(&mfc_unres_lock); | |
288 | it->cache = NULL; | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
293 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
294 | { | |
295 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 296 | struct net *net = seq_file_net(seq); |
6bd52143 | 297 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 | 298 | |
6bd52143 | 299 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 | 300 | spin_unlock_bh(&mfc_unres_lock); |
6bd52143 | 301 | else if (it->cache == mrt->mfc6_cache_array) |
7bc570c8 YH |
302 | read_unlock(&mrt_lock); |
303 | } | |
304 | ||
305 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
306 | { | |
307 | int n; | |
8b90fc7e | 308 | struct net *net = seq_file_net(seq); |
6bd52143 | 309 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
310 | |
311 | if (v == SEQ_START_TOKEN) { | |
312 | seq_puts(seq, | |
313 | "Group " | |
314 | "Origin " | |
315 | "Iif Pkts Bytes Wrong Oifs\n"); | |
316 | } else { | |
317 | const struct mfc6_cache *mfc = v; | |
318 | const struct ipmr_mfc_iter *it = seq->private; | |
319 | ||
999890b2 | 320 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 321 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 322 | mfc->mf6c_parent); |
7bc570c8 | 323 | |
6bd52143 | 324 | if (it->cache != &mrt->mfc6_unres_queue) { |
1ea472e2 BT |
325 | seq_printf(seq, " %8lu %8lu %8lu", |
326 | mfc->mfc_un.res.pkt, | |
327 | mfc->mfc_un.res.bytes, | |
328 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
329 | for (n = mfc->mfc_un.res.minvif; |
330 | n < mfc->mfc_un.res.maxvif; n++) { | |
6bd52143 | 331 | if (MIF_EXISTS(mrt, n) && |
7bc570c8 YH |
332 | mfc->mfc_un.res.ttls[n] < 255) |
333 | seq_printf(seq, | |
334 | " %2d:%-3d", | |
335 | n, mfc->mfc_un.res.ttls[n]); | |
336 | } | |
1ea472e2 BT |
337 | } else { |
338 | /* unresolved mfc_caches don't contain | |
339 | * pkt, bytes and wrong_if values | |
340 | */ | |
341 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
342 | } |
343 | seq_putc(seq, '\n'); | |
344 | } | |
345 | return 0; | |
346 | } | |
347 | ||
88e9d34c | 348 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
349 | .start = ipmr_mfc_seq_start, |
350 | .next = ipmr_mfc_seq_next, | |
351 | .stop = ipmr_mfc_seq_stop, | |
352 | .show = ipmr_mfc_seq_show, | |
353 | }; | |
354 | ||
355 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
356 | { | |
8b90fc7e BT |
357 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
358 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
359 | } |
360 | ||
5ca1b998 | 361 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
362 | .owner = THIS_MODULE, |
363 | .open = ipmr_mfc_open, | |
364 | .read = seq_read, | |
365 | .llseek = seq_lseek, | |
8b90fc7e | 366 | .release = seq_release_net, |
7bc570c8 YH |
367 | }; |
368 | #endif | |
369 | ||
14fb64e1 | 370 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
371 | |
372 | static int pim6_rcv(struct sk_buff *skb) | |
373 | { | |
374 | struct pimreghdr *pim; | |
375 | struct ipv6hdr *encap; | |
376 | struct net_device *reg_dev = NULL; | |
8229efda | 377 | struct net *net = dev_net(skb->dev); |
6bd52143 PM |
378 | struct mr6_table *mrt = net->ipv6.mrt6; |
379 | int reg_vif_num = mrt->mroute_reg_vif_num; | |
14fb64e1 YH |
380 | |
381 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
382 | goto drop; | |
383 | ||
384 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
385 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
386 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
387 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
388 | sizeof(*pim), IPPROTO_PIM, | |
389 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 390 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
391 | goto drop; |
392 | ||
393 | /* check if the inner packet is destined to mcast group */ | |
394 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
395 | sizeof(*pim)); | |
396 | ||
397 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
398 | encap->payload_len == 0 || | |
399 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
400 | goto drop; | |
401 | ||
402 | read_lock(&mrt_lock); | |
403 | if (reg_vif_num >= 0) | |
6bd52143 | 404 | reg_dev = mrt->vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
405 | if (reg_dev) |
406 | dev_hold(reg_dev); | |
407 | read_unlock(&mrt_lock); | |
408 | ||
409 | if (reg_dev == NULL) | |
410 | goto drop; | |
411 | ||
412 | skb->mac_header = skb->network_header; | |
413 | skb_pull(skb, (u8 *)encap - skb->data); | |
414 | skb_reset_network_header(skb); | |
415 | skb->dev = reg_dev; | |
1d6e55f1 | 416 | skb->protocol = htons(ETH_P_IPV6); |
14fb64e1 YH |
417 | skb->ip_summed = 0; |
418 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 419 | skb_dst_drop(skb); |
dc58c78c PE |
420 | reg_dev->stats.rx_bytes += skb->len; |
421 | reg_dev->stats.rx_packets++; | |
14fb64e1 YH |
422 | nf_reset(skb); |
423 | netif_rx(skb); | |
424 | dev_put(reg_dev); | |
425 | return 0; | |
426 | drop: | |
427 | kfree_skb(skb); | |
428 | return 0; | |
429 | } | |
430 | ||
41135cc8 | 431 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
432 | .handler = pim6_rcv, |
433 | }; | |
434 | ||
435 | /* Service routines creating virtual interfaces: PIMREG */ | |
436 | ||
6fef4c0c SH |
437 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
438 | struct net_device *dev) | |
14fb64e1 | 439 | { |
8229efda | 440 | struct net *net = dev_net(dev); |
6bd52143 | 441 | struct mr6_table *mrt = net->ipv6.mrt6; |
8229efda | 442 | |
14fb64e1 | 443 | read_lock(&mrt_lock); |
dc58c78c PE |
444 | dev->stats.tx_bytes += skb->len; |
445 | dev->stats.tx_packets++; | |
6bd52143 | 446 | ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
14fb64e1 YH |
447 | read_unlock(&mrt_lock); |
448 | kfree_skb(skb); | |
6ed10654 | 449 | return NETDEV_TX_OK; |
14fb64e1 YH |
450 | } |
451 | ||
007c3838 SH |
452 | static const struct net_device_ops reg_vif_netdev_ops = { |
453 | .ndo_start_xmit = reg_vif_xmit, | |
454 | }; | |
455 | ||
14fb64e1 YH |
456 | static void reg_vif_setup(struct net_device *dev) |
457 | { | |
458 | dev->type = ARPHRD_PIMREG; | |
459 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
460 | dev->flags = IFF_NOARP; | |
007c3838 | 461 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 462 | dev->destructor = free_netdev; |
403dbb97 | 463 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
464 | } |
465 | ||
8229efda | 466 | static struct net_device *ip6mr_reg_vif(struct net *net) |
14fb64e1 YH |
467 | { |
468 | struct net_device *dev; | |
14fb64e1 | 469 | |
dc58c78c | 470 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
14fb64e1 YH |
471 | if (dev == NULL) |
472 | return NULL; | |
473 | ||
8229efda BT |
474 | dev_net_set(dev, net); |
475 | ||
14fb64e1 YH |
476 | if (register_netdevice(dev)) { |
477 | free_netdev(dev); | |
478 | return NULL; | |
479 | } | |
480 | dev->iflink = 0; | |
481 | ||
14fb64e1 YH |
482 | if (dev_open(dev)) |
483 | goto failure; | |
484 | ||
7af3db78 | 485 | dev_hold(dev); |
14fb64e1 YH |
486 | return dev; |
487 | ||
488 | failure: | |
489 | /* allow the register to be completed before unregistering. */ | |
490 | rtnl_unlock(); | |
491 | rtnl_lock(); | |
492 | ||
493 | unregister_netdevice(dev); | |
494 | return NULL; | |
495 | } | |
496 | #endif | |
497 | ||
7bc570c8 YH |
498 | /* |
499 | * Delete a VIF entry | |
500 | */ | |
501 | ||
6bd52143 | 502 | static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) |
7bc570c8 YH |
503 | { |
504 | struct mif_device *v; | |
505 | struct net_device *dev; | |
1d6e55f1 | 506 | struct inet6_dev *in6_dev; |
6bd52143 PM |
507 | |
508 | if (vifi < 0 || vifi >= mrt->maxvif) | |
7bc570c8 YH |
509 | return -EADDRNOTAVAIL; |
510 | ||
6bd52143 | 511 | v = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
512 | |
513 | write_lock_bh(&mrt_lock); | |
514 | dev = v->dev; | |
515 | v->dev = NULL; | |
516 | ||
517 | if (!dev) { | |
518 | write_unlock_bh(&mrt_lock); | |
519 | return -EADDRNOTAVAIL; | |
520 | } | |
521 | ||
14fb64e1 | 522 | #ifdef CONFIG_IPV6_PIMSM_V2 |
6bd52143 PM |
523 | if (vifi == mrt->mroute_reg_vif_num) |
524 | mrt->mroute_reg_vif_num = -1; | |
14fb64e1 YH |
525 | #endif |
526 | ||
6bd52143 | 527 | if (vifi + 1 == mrt->maxvif) { |
7bc570c8 YH |
528 | int tmp; |
529 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
6bd52143 | 530 | if (MIF_EXISTS(mrt, tmp)) |
7bc570c8 YH |
531 | break; |
532 | } | |
6bd52143 | 533 | mrt->maxvif = tmp + 1; |
7bc570c8 YH |
534 | } |
535 | ||
536 | write_unlock_bh(&mrt_lock); | |
537 | ||
538 | dev_set_allmulti(dev, -1); | |
539 | ||
1d6e55f1 TG |
540 | in6_dev = __in6_dev_get(dev); |
541 | if (in6_dev) | |
542 | in6_dev->cnf.mc_forwarding--; | |
543 | ||
7bc570c8 | 544 | if (v->flags & MIFF_REGISTER) |
c871e664 | 545 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
546 | |
547 | dev_put(dev); | |
548 | return 0; | |
549 | } | |
550 | ||
58701ad4 BT |
551 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
552 | { | |
58701ad4 BT |
553 | kmem_cache_free(mrt_cachep, c); |
554 | } | |
555 | ||
7bc570c8 YH |
556 | /* Destroy an unresolved cache entry, killing queued skbs |
557 | and reporting error to netlink readers. | |
558 | */ | |
559 | ||
6bd52143 | 560 | static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) |
7bc570c8 | 561 | { |
6bd52143 | 562 | struct net *net = read_pnet(&mrt->net); |
7bc570c8 YH |
563 | struct sk_buff *skb; |
564 | ||
6bd52143 | 565 | atomic_dec(&mrt->cache_resolve_queue_len); |
7bc570c8 YH |
566 | |
567 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
568 | if (ipv6_hdr(skb)->version == 0) { | |
569 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
570 | nlh->nlmsg_type = NLMSG_ERROR; | |
571 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
572 | skb_trim(skb, nlh->nlmsg_len); | |
573 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 574 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
575 | } else |
576 | kfree_skb(skb); | |
577 | } | |
578 | ||
58701ad4 | 579 | ip6mr_cache_free(c); |
7bc570c8 YH |
580 | } |
581 | ||
582 | ||
c476efbc | 583 | /* Timer process for all the unresolved queue. */ |
7bc570c8 | 584 | |
6bd52143 | 585 | static void ipmr_do_expire_process(struct mr6_table *mrt) |
7bc570c8 YH |
586 | { |
587 | unsigned long now = jiffies; | |
588 | unsigned long expires = 10 * HZ; | |
f30a7784 | 589 | struct mfc6_cache *c, *next; |
7bc570c8 | 590 | |
6bd52143 | 591 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
7bc570c8 YH |
592 | if (time_after(c->mfc_un.unres.expires, now)) { |
593 | /* not yet... */ | |
594 | unsigned long interval = c->mfc_un.unres.expires - now; | |
595 | if (interval < expires) | |
596 | expires = interval; | |
7bc570c8 YH |
597 | continue; |
598 | } | |
599 | ||
f30a7784 | 600 | list_del(&c->list); |
6bd52143 | 601 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
602 | } |
603 | ||
6bd52143 PM |
604 | if (!list_empty(&mrt->mfc6_unres_queue)) |
605 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
7bc570c8 YH |
606 | } |
607 | ||
c476efbc | 608 | static void ipmr_expire_process(unsigned long arg) |
7bc570c8 | 609 | { |
6bd52143 | 610 | struct mr6_table *mrt = (struct mr6_table *)arg; |
c476efbc | 611 | |
7bc570c8 | 612 | if (!spin_trylock(&mfc_unres_lock)) { |
6bd52143 | 613 | mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
7bc570c8 YH |
614 | return; |
615 | } | |
616 | ||
6bd52143 PM |
617 | if (!list_empty(&mrt->mfc6_unres_queue)) |
618 | ipmr_do_expire_process(mrt); | |
7bc570c8 YH |
619 | |
620 | spin_unlock(&mfc_unres_lock); | |
621 | } | |
622 | ||
623 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
624 | ||
6bd52143 | 625 | static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, |
b5aa30b1 | 626 | unsigned char *ttls) |
7bc570c8 YH |
627 | { |
628 | int vifi; | |
629 | ||
6ac7eb08 | 630 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 631 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 632 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 633 | |
6bd52143 PM |
634 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
635 | if (MIF_EXISTS(mrt, vifi) && | |
4e16880c | 636 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
637 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
638 | if (cache->mfc_un.res.minvif > vifi) | |
639 | cache->mfc_un.res.minvif = vifi; | |
640 | if (cache->mfc_un.res.maxvif <= vifi) | |
641 | cache->mfc_un.res.maxvif = vifi + 1; | |
642 | } | |
643 | } | |
644 | } | |
645 | ||
6bd52143 PM |
646 | static int mif6_add(struct net *net, struct mr6_table *mrt, |
647 | struct mif6ctl *vifc, int mrtsock) | |
7bc570c8 YH |
648 | { |
649 | int vifi = vifc->mif6c_mifi; | |
6bd52143 | 650 | struct mif_device *v = &mrt->vif6_table[vifi]; |
7bc570c8 | 651 | struct net_device *dev; |
1d6e55f1 | 652 | struct inet6_dev *in6_dev; |
5ae7b444 | 653 | int err; |
7bc570c8 YH |
654 | |
655 | /* Is vif busy ? */ | |
6bd52143 | 656 | if (MIF_EXISTS(mrt, vifi)) |
7bc570c8 YH |
657 | return -EADDRINUSE; |
658 | ||
659 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
660 | #ifdef CONFIG_IPV6_PIMSM_V2 |
661 | case MIFF_REGISTER: | |
662 | /* | |
663 | * Special Purpose VIF in PIM | |
664 | * All the packets will be sent to the daemon | |
665 | */ | |
6bd52143 | 666 | if (mrt->mroute_reg_vif_num >= 0) |
14fb64e1 | 667 | return -EADDRINUSE; |
8229efda | 668 | dev = ip6mr_reg_vif(net); |
14fb64e1 YH |
669 | if (!dev) |
670 | return -ENOBUFS; | |
5ae7b444 WC |
671 | err = dev_set_allmulti(dev, 1); |
672 | if (err) { | |
673 | unregister_netdevice(dev); | |
7af3db78 | 674 | dev_put(dev); |
5ae7b444 WC |
675 | return err; |
676 | } | |
14fb64e1 YH |
677 | break; |
678 | #endif | |
7bc570c8 | 679 | case 0: |
8229efda | 680 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
681 | if (!dev) |
682 | return -EADDRNOTAVAIL; | |
5ae7b444 | 683 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
684 | if (err) { |
685 | dev_put(dev); | |
5ae7b444 | 686 | return err; |
7af3db78 | 687 | } |
7bc570c8 YH |
688 | break; |
689 | default: | |
690 | return -EINVAL; | |
691 | } | |
692 | ||
1d6e55f1 TG |
693 | in6_dev = __in6_dev_get(dev); |
694 | if (in6_dev) | |
695 | in6_dev->cnf.mc_forwarding++; | |
696 | ||
7bc570c8 YH |
697 | /* |
698 | * Fill in the VIF structures | |
699 | */ | |
700 | v->rate_limit = vifc->vifc_rate_limit; | |
701 | v->flags = vifc->mif6c_flags; | |
702 | if (!mrtsock) | |
703 | v->flags |= VIFF_STATIC; | |
704 | v->threshold = vifc->vifc_threshold; | |
705 | v->bytes_in = 0; | |
706 | v->bytes_out = 0; | |
707 | v->pkt_in = 0; | |
708 | v->pkt_out = 0; | |
709 | v->link = dev->ifindex; | |
710 | if (v->flags & MIFF_REGISTER) | |
711 | v->link = dev->iflink; | |
712 | ||
713 | /* And finish update writing critical data */ | |
714 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 715 | v->dev = dev; |
14fb64e1 YH |
716 | #ifdef CONFIG_IPV6_PIMSM_V2 |
717 | if (v->flags & MIFF_REGISTER) | |
6bd52143 | 718 | mrt->mroute_reg_vif_num = vifi; |
14fb64e1 | 719 | #endif |
6bd52143 PM |
720 | if (vifi + 1 > mrt->maxvif) |
721 | mrt->maxvif = vifi + 1; | |
7bc570c8 YH |
722 | write_unlock_bh(&mrt_lock); |
723 | return 0; | |
724 | } | |
725 | ||
6bd52143 | 726 | static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, |
8229efda BT |
727 | struct in6_addr *origin, |
728 | struct in6_addr *mcastgrp) | |
7bc570c8 YH |
729 | { |
730 | int line = MFC6_HASH(mcastgrp, origin); | |
731 | struct mfc6_cache *c; | |
732 | ||
6bd52143 | 733 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
734 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
735 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
f30a7784 | 736 | return c; |
7bc570c8 | 737 | } |
f30a7784 | 738 | return NULL; |
7bc570c8 YH |
739 | } |
740 | ||
741 | /* | |
742 | * Allocate a multicast cache entry | |
743 | */ | |
b5aa30b1 | 744 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
7bc570c8 | 745 | { |
36cbac59 | 746 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
747 | if (c == NULL) |
748 | return NULL; | |
6ac7eb08 | 749 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
750 | return c; |
751 | } | |
752 | ||
b5aa30b1 | 753 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
7bc570c8 | 754 | { |
36cbac59 | 755 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
756 | if (c == NULL) |
757 | return NULL; | |
7bc570c8 YH |
758 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
759 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
760 | return c; | |
761 | } | |
762 | ||
763 | /* | |
764 | * A cache entry has gone into a resolved state from queued | |
765 | */ | |
766 | ||
6bd52143 PM |
767 | static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, |
768 | struct mfc6_cache *uc, struct mfc6_cache *c) | |
7bc570c8 YH |
769 | { |
770 | struct sk_buff *skb; | |
771 | ||
772 | /* | |
773 | * Play the pending entries through our router | |
774 | */ | |
775 | ||
776 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
777 | if (ipv6_hdr(skb)->version == 0) { | |
778 | int err; | |
779 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
780 | ||
6bd52143 | 781 | if (ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
549e028d | 782 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
783 | } else { |
784 | nlh->nlmsg_type = NLMSG_ERROR; | |
785 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
786 | skb_trim(skb, nlh->nlmsg_len); | |
787 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
788 | } | |
b5aa30b1 | 789 | err = rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 | 790 | } else |
6bd52143 | 791 | ip6_mr_forward(net, mrt, skb, c); |
7bc570c8 YH |
792 | } |
793 | } | |
794 | ||
795 | /* | |
796 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
797 | * expects the following bizarre scheme. | |
798 | * | |
799 | * Called under mrt_lock. | |
800 | */ | |
801 | ||
6bd52143 PM |
802 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
803 | mifi_t mifi, int assert) | |
7bc570c8 YH |
804 | { |
805 | struct sk_buff *skb; | |
806 | struct mrt6msg *msg; | |
807 | int ret; | |
808 | ||
14fb64e1 YH |
809 | #ifdef CONFIG_IPV6_PIMSM_V2 |
810 | if (assert == MRT6MSG_WHOLEPKT) | |
811 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
812 | +sizeof(*msg)); | |
813 | else | |
814 | #endif | |
815 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
816 | |
817 | if (!skb) | |
818 | return -ENOBUFS; | |
819 | ||
820 | /* I suppose that internal messages | |
821 | * do not require checksums */ | |
822 | ||
823 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
824 | ||
14fb64e1 YH |
825 | #ifdef CONFIG_IPV6_PIMSM_V2 |
826 | if (assert == MRT6MSG_WHOLEPKT) { | |
827 | /* Ugly, but we have no choice with this interface. | |
828 | Duplicate old header, fix length etc. | |
829 | And all this only to mangle msg->im6_msgtype and | |
830 | to set msg->im6_mbz to "mbz" :-) | |
831 | */ | |
832 | skb_push(skb, -skb_network_offset(pkt)); | |
833 | ||
834 | skb_push(skb, sizeof(*msg)); | |
835 | skb_reset_transport_header(skb); | |
836 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
837 | msg->im6_mbz = 0; | |
838 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
6bd52143 | 839 | msg->im6_mif = mrt->mroute_reg_vif_num; |
14fb64e1 YH |
840 | msg->im6_pad = 0; |
841 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
842 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
843 | ||
844 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
845 | } else | |
846 | #endif | |
847 | { | |
7bc570c8 YH |
848 | /* |
849 | * Copy the IP header | |
850 | */ | |
851 | ||
852 | skb_put(skb, sizeof(struct ipv6hdr)); | |
853 | skb_reset_network_header(skb); | |
854 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
855 | ||
856 | /* | |
857 | * Add our header | |
858 | */ | |
859 | skb_put(skb, sizeof(*msg)); | |
860 | skb_reset_transport_header(skb); | |
861 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
862 | ||
863 | msg->im6_mbz = 0; | |
864 | msg->im6_msgtype = assert; | |
6ac7eb08 | 865 | msg->im6_mif = mifi; |
7bc570c8 YH |
866 | msg->im6_pad = 0; |
867 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
868 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
869 | ||
adf30907 | 870 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 871 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 872 | } |
7bc570c8 | 873 | |
6bd52143 | 874 | if (mrt->mroute6_sk == NULL) { |
7bc570c8 YH |
875 | kfree_skb(skb); |
876 | return -EINVAL; | |
877 | } | |
878 | ||
879 | /* | |
880 | * Deliver to user space multicast routing algorithms | |
881 | */ | |
6bd52143 | 882 | ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); |
bd91b8bf | 883 | if (ret < 0) { |
7bc570c8 YH |
884 | if (net_ratelimit()) |
885 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
886 | kfree_skb(skb); | |
887 | } | |
888 | ||
889 | return ret; | |
890 | } | |
891 | ||
892 | /* | |
893 | * Queue a packet for resolution. It gets locked cache entry! | |
894 | */ | |
895 | ||
896 | static int | |
6bd52143 | 897 | ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 | 898 | { |
f30a7784 | 899 | bool found = false; |
7bc570c8 YH |
900 | int err; |
901 | struct mfc6_cache *c; | |
902 | ||
903 | spin_lock_bh(&mfc_unres_lock); | |
6bd52143 | 904 | list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { |
c476efbc | 905 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
f30a7784 PM |
906 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
907 | found = true; | |
7bc570c8 | 908 | break; |
f30a7784 | 909 | } |
7bc570c8 YH |
910 | } |
911 | ||
f30a7784 | 912 | if (!found) { |
7bc570c8 YH |
913 | /* |
914 | * Create a new entry if allowable | |
915 | */ | |
916 | ||
6bd52143 | 917 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
b5aa30b1 | 918 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
7bc570c8 YH |
919 | spin_unlock_bh(&mfc_unres_lock); |
920 | ||
921 | kfree_skb(skb); | |
922 | return -ENOBUFS; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Fill in the new cache entry | |
927 | */ | |
928 | c->mf6c_parent = -1; | |
929 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
930 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
931 | ||
932 | /* | |
933 | * Reflect first query at pim6sd | |
934 | */ | |
6bd52143 | 935 | err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
8229efda | 936 | if (err < 0) { |
7bc570c8 YH |
937 | /* If the report failed throw the cache entry |
938 | out - Brad Parker | |
939 | */ | |
940 | spin_unlock_bh(&mfc_unres_lock); | |
941 | ||
58701ad4 | 942 | ip6mr_cache_free(c); |
7bc570c8 YH |
943 | kfree_skb(skb); |
944 | return err; | |
945 | } | |
946 | ||
6bd52143 PM |
947 | atomic_inc(&mrt->cache_resolve_queue_len); |
948 | list_add(&c->list, &mrt->mfc6_unres_queue); | |
7bc570c8 | 949 | |
6bd52143 | 950 | ipmr_do_expire_process(mrt); |
7bc570c8 YH |
951 | } |
952 | ||
953 | /* | |
954 | * See if we can append the packet | |
955 | */ | |
956 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
957 | kfree_skb(skb); | |
958 | err = -ENOBUFS; | |
959 | } else { | |
960 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
961 | err = 0; | |
962 | } | |
963 | ||
964 | spin_unlock_bh(&mfc_unres_lock); | |
965 | return err; | |
966 | } | |
967 | ||
968 | /* | |
969 | * MFC6 cache manipulation by user space | |
970 | */ | |
971 | ||
6bd52143 | 972 | static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc) |
7bc570c8 YH |
973 | { |
974 | int line; | |
f30a7784 | 975 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
976 | |
977 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
978 | ||
6bd52143 | 979 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
980 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
981 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
982 | write_lock_bh(&mrt_lock); | |
f30a7784 | 983 | list_del(&c->list); |
7bc570c8 YH |
984 | write_unlock_bh(&mrt_lock); |
985 | ||
58701ad4 | 986 | ip6mr_cache_free(c); |
7bc570c8 YH |
987 | return 0; |
988 | } | |
989 | } | |
990 | return -ENOENT; | |
991 | } | |
992 | ||
993 | static int ip6mr_device_event(struct notifier_block *this, | |
994 | unsigned long event, void *ptr) | |
995 | { | |
996 | struct net_device *dev = ptr; | |
8229efda | 997 | struct net *net = dev_net(dev); |
6bd52143 | 998 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
999 | struct mif_device *v; |
1000 | int ct; | |
c871e664 | 1001 | LIST_HEAD(list); |
7bc570c8 | 1002 | |
7bc570c8 YH |
1003 | if (event != NETDEV_UNREGISTER) |
1004 | return NOTIFY_DONE; | |
1005 | ||
6bd52143 PM |
1006 | v = &mrt->vif6_table[0]; |
1007 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
7bc570c8 | 1008 | if (v->dev == dev) |
6bd52143 | 1009 | mif6_delete(mrt, ct, &list); |
7bc570c8 | 1010 | } |
c871e664 ED |
1011 | unregister_netdevice_many(&list); |
1012 | ||
7bc570c8 YH |
1013 | return NOTIFY_DONE; |
1014 | } | |
1015 | ||
1016 | static struct notifier_block ip6_mr_notifier = { | |
1017 | .notifier_call = ip6mr_device_event | |
1018 | }; | |
1019 | ||
1020 | /* | |
1021 | * Setup for IP multicast routing | |
1022 | */ | |
1023 | ||
4e16880c BT |
1024 | static int __net_init ip6mr_net_init(struct net *net) |
1025 | { | |
6bd52143 | 1026 | struct mr6_table *mrt; |
f30a7784 | 1027 | unsigned int i; |
4e16880c | 1028 | int err = 0; |
f30a7784 | 1029 | |
6bd52143 PM |
1030 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); |
1031 | if (mrt == NULL) { | |
4e16880c BT |
1032 | err = -ENOMEM; |
1033 | goto fail; | |
1034 | } | |
4a6258a0 | 1035 | |
6bd52143 | 1036 | write_pnet(&mrt->net, net); |
950d5704 | 1037 | |
f30a7784 | 1038 | for (i = 0; i < MFC6_LINES; i++) |
6bd52143 | 1039 | INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); |
f30a7784 | 1040 | |
6bd52143 | 1041 | INIT_LIST_HEAD(&mrt->mfc6_unres_queue); |
f30a7784 | 1042 | |
6bd52143 PM |
1043 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, |
1044 | (unsigned long)mrt); | |
c476efbc | 1045 | |
950d5704 | 1046 | #ifdef CONFIG_IPV6_PIMSM_V2 |
6bd52143 | 1047 | mrt->mroute_reg_vif_num = -1; |
950d5704 | 1048 | #endif |
8b90fc7e BT |
1049 | |
1050 | #ifdef CONFIG_PROC_FS | |
1051 | err = -ENOMEM; | |
1052 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1053 | goto proc_vif_fail; | |
1054 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1055 | goto proc_cache_fail; | |
1056 | #endif | |
6bd52143 PM |
1057 | |
1058 | net->ipv6.mrt6 = mrt; | |
4a6258a0 BT |
1059 | return 0; |
1060 | ||
8b90fc7e BT |
1061 | #ifdef CONFIG_PROC_FS |
1062 | proc_cache_fail: | |
1063 | proc_net_remove(net, "ip6_mr_vif"); | |
1064 | proc_vif_fail: | |
6bd52143 | 1065 | kfree(mrt); |
8b90fc7e | 1066 | #endif |
4e16880c BT |
1067 | fail: |
1068 | return err; | |
1069 | } | |
1070 | ||
1071 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1072 | { | |
6bd52143 PM |
1073 | struct mr6_table *mrt = net->ipv6.mrt6; |
1074 | ||
8b90fc7e BT |
1075 | #ifdef CONFIG_PROC_FS |
1076 | proc_net_remove(net, "ip6_mr_cache"); | |
1077 | proc_net_remove(net, "ip6_mr_vif"); | |
1078 | #endif | |
6bd52143 PM |
1079 | del_timer(&mrt->ipmr_expire_timer); |
1080 | mroute_clean_tables(mrt); | |
1081 | kfree(mrt); | |
4e16880c BT |
1082 | } |
1083 | ||
1084 | static struct pernet_operations ip6mr_net_ops = { | |
1085 | .init = ip6mr_net_init, | |
1086 | .exit = ip6mr_net_exit, | |
1087 | }; | |
1088 | ||
623d1a1a | 1089 | int __init ip6_mr_init(void) |
7bc570c8 | 1090 | { |
623d1a1a WC |
1091 | int err; |
1092 | ||
7bc570c8 YH |
1093 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1094 | sizeof(struct mfc6_cache), | |
1095 | 0, SLAB_HWCACHE_ALIGN, | |
1096 | NULL); | |
1097 | if (!mrt_cachep) | |
623d1a1a | 1098 | return -ENOMEM; |
7bc570c8 | 1099 | |
4e16880c BT |
1100 | err = register_pernet_subsys(&ip6mr_net_ops); |
1101 | if (err) | |
1102 | goto reg_pernet_fail; | |
1103 | ||
623d1a1a WC |
1104 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1105 | if (err) | |
1106 | goto reg_notif_fail; | |
403dbb97 TG |
1107 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1108 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
1109 | printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); | |
1110 | err = -EAGAIN; | |
1111 | goto add_proto_fail; | |
1112 | } | |
1113 | #endif | |
623d1a1a | 1114 | return 0; |
403dbb97 TG |
1115 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1116 | add_proto_fail: | |
1117 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1118 | #endif | |
87b30a65 | 1119 | reg_notif_fail: |
4e16880c BT |
1120 | unregister_pernet_subsys(&ip6mr_net_ops); |
1121 | reg_pernet_fail: | |
87b30a65 | 1122 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1123 | return err; |
7bc570c8 YH |
1124 | } |
1125 | ||
623d1a1a WC |
1126 | void ip6_mr_cleanup(void) |
1127 | { | |
623d1a1a | 1128 | unregister_netdevice_notifier(&ip6_mr_notifier); |
4e16880c | 1129 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1130 | kmem_cache_destroy(mrt_cachep); |
1131 | } | |
7bc570c8 | 1132 | |
6bd52143 PM |
1133 | static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, |
1134 | struct mf6cctl *mfc, int mrtsock) | |
7bc570c8 | 1135 | { |
f30a7784 | 1136 | bool found = false; |
7bc570c8 | 1137 | int line; |
f30a7784 | 1138 | struct mfc6_cache *uc, *c; |
6ac7eb08 | 1139 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1140 | int i; |
1141 | ||
a50436f2 PM |
1142 | if (mfc->mf6cc_parent >= MAXMIFS) |
1143 | return -ENFILE; | |
1144 | ||
6ac7eb08 RR |
1145 | memset(ttls, 255, MAXMIFS); |
1146 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1147 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1148 | ttls[i] = 1; | |
1149 | ||
1150 | } | |
1151 | ||
1152 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1153 | ||
6bd52143 | 1154 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 | 1155 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
f30a7784 PM |
1156 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
1157 | found = true; | |
7bc570c8 | 1158 | break; |
f30a7784 | 1159 | } |
7bc570c8 YH |
1160 | } |
1161 | ||
f30a7784 | 1162 | if (found) { |
7bc570c8 YH |
1163 | write_lock_bh(&mrt_lock); |
1164 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1165 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1166 | if (!mrtsock) |
1167 | c->mfc_flags |= MFC_STATIC; | |
1168 | write_unlock_bh(&mrt_lock); | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1173 | return -EINVAL; | |
1174 | ||
b5aa30b1 | 1175 | c = ip6mr_cache_alloc(); |
7bc570c8 YH |
1176 | if (c == NULL) |
1177 | return -ENOMEM; | |
1178 | ||
1179 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1180 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1181 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1182 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1183 | if (!mrtsock) |
1184 | c->mfc_flags |= MFC_STATIC; | |
1185 | ||
1186 | write_lock_bh(&mrt_lock); | |
6bd52143 | 1187 | list_add(&c->list, &mrt->mfc6_cache_array[line]); |
7bc570c8 YH |
1188 | write_unlock_bh(&mrt_lock); |
1189 | ||
1190 | /* | |
1191 | * Check to see if we resolved a queued list. If so we | |
1192 | * need to send on the frames and tidy up. | |
1193 | */ | |
f30a7784 | 1194 | found = false; |
7bc570c8 | 1195 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1196 | list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1197 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 | 1198 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
f30a7784 | 1199 | list_del(&uc->list); |
6bd52143 | 1200 | atomic_dec(&mrt->cache_resolve_queue_len); |
f30a7784 | 1201 | found = true; |
7bc570c8 YH |
1202 | break; |
1203 | } | |
1204 | } | |
6bd52143 PM |
1205 | if (list_empty(&mrt->mfc6_unres_queue)) |
1206 | del_timer(&mrt->ipmr_expire_timer); | |
7bc570c8 YH |
1207 | spin_unlock_bh(&mfc_unres_lock); |
1208 | ||
f30a7784 | 1209 | if (found) { |
6bd52143 | 1210 | ip6mr_cache_resolve(net, mrt, uc, c); |
58701ad4 | 1211 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1212 | } |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Close the multicast socket, and clear the vif tables etc | |
1218 | */ | |
1219 | ||
6bd52143 | 1220 | static void mroute_clean_tables(struct mr6_table *mrt) |
7bc570c8 YH |
1221 | { |
1222 | int i; | |
c871e664 | 1223 | LIST_HEAD(list); |
f30a7784 | 1224 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1225 | |
1226 | /* | |
1227 | * Shut down all active vif entries | |
1228 | */ | |
6bd52143 PM |
1229 | for (i = 0; i < mrt->maxvif; i++) { |
1230 | if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) | |
1231 | mif6_delete(mrt, i, &list); | |
7bc570c8 | 1232 | } |
c871e664 | 1233 | unregister_netdevice_many(&list); |
7bc570c8 YH |
1234 | |
1235 | /* | |
1236 | * Wipe the cache | |
1237 | */ | |
4a6258a0 | 1238 | for (i = 0; i < MFC6_LINES; i++) { |
6bd52143 | 1239 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { |
f30a7784 | 1240 | if (c->mfc_flags & MFC_STATIC) |
7bc570c8 | 1241 | continue; |
7bc570c8 | 1242 | write_lock_bh(&mrt_lock); |
f30a7784 | 1243 | list_del(&c->list); |
7bc570c8 YH |
1244 | write_unlock_bh(&mrt_lock); |
1245 | ||
58701ad4 | 1246 | ip6mr_cache_free(c); |
7bc570c8 YH |
1247 | } |
1248 | } | |
1249 | ||
6bd52143 | 1250 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
7bc570c8 | 1251 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1252 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
f30a7784 | 1253 | list_del(&c->list); |
6bd52143 | 1254 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
1255 | } |
1256 | spin_unlock_bh(&mfc_unres_lock); | |
1257 | } | |
1258 | } | |
1259 | ||
6bd52143 | 1260 | static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) |
7bc570c8 YH |
1261 | { |
1262 | int err = 0; | |
8229efda | 1263 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1264 | |
1265 | rtnl_lock(); | |
1266 | write_lock_bh(&mrt_lock); | |
6bd52143 PM |
1267 | if (likely(mrt->mroute6_sk == NULL)) { |
1268 | mrt->mroute6_sk = sk; | |
1d6e55f1 TG |
1269 | net->ipv6.devconf_all->mc_forwarding++; |
1270 | } | |
7bc570c8 YH |
1271 | else |
1272 | err = -EADDRINUSE; | |
1273 | write_unlock_bh(&mrt_lock); | |
1274 | ||
1275 | rtnl_unlock(); | |
1276 | ||
1277 | return err; | |
1278 | } | |
1279 | ||
1280 | int ip6mr_sk_done(struct sock *sk) | |
1281 | { | |
1282 | int err = 0; | |
8229efda | 1283 | struct net *net = sock_net(sk); |
6bd52143 | 1284 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
1285 | |
1286 | rtnl_lock(); | |
6bd52143 | 1287 | if (sk == mrt->mroute6_sk) { |
7bc570c8 | 1288 | write_lock_bh(&mrt_lock); |
6bd52143 | 1289 | mrt->mroute6_sk = NULL; |
1d6e55f1 | 1290 | net->ipv6.devconf_all->mc_forwarding--; |
7bc570c8 YH |
1291 | write_unlock_bh(&mrt_lock); |
1292 | ||
6bd52143 | 1293 | mroute_clean_tables(mrt); |
7bc570c8 YH |
1294 | } else |
1295 | err = -EACCES; | |
1296 | rtnl_unlock(); | |
1297 | ||
1298 | return err; | |
1299 | } | |
1300 | ||
6bd52143 PM |
1301 | struct sock *mroute6_socket(struct net *net) |
1302 | { | |
1303 | struct mr6_table *mrt = net->ipv6.mrt6; | |
1304 | ||
1305 | return mrt->mroute6_sk; | |
1306 | } | |
1307 | ||
7bc570c8 YH |
1308 | /* |
1309 | * Socket options and virtual interface manipulation. The whole | |
1310 | * virtual interface system is a complete heap, but unfortunately | |
1311 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1312 | * MOSPF/PIM router set up we can clean this up. | |
1313 | */ | |
1314 | ||
b7058842 | 1315 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1316 | { |
1317 | int ret; | |
1318 | struct mif6ctl vif; | |
1319 | struct mf6cctl mfc; | |
1320 | mifi_t mifi; | |
8229efda | 1321 | struct net *net = sock_net(sk); |
6bd52143 | 1322 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
1323 | |
1324 | if (optname != MRT6_INIT) { | |
6bd52143 | 1325 | if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1326 | return -EACCES; |
1327 | } | |
1328 | ||
1329 | switch (optname) { | |
1330 | case MRT6_INIT: | |
1331 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1332 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1333 | return -EOPNOTSUPP; |
1334 | if (optlen < sizeof(int)) | |
1335 | return -EINVAL; | |
1336 | ||
6bd52143 | 1337 | return ip6mr_sk_init(mrt, sk); |
7bc570c8 YH |
1338 | |
1339 | case MRT6_DONE: | |
1340 | return ip6mr_sk_done(sk); | |
1341 | ||
1342 | case MRT6_ADD_MIF: | |
1343 | if (optlen < sizeof(vif)) | |
1344 | return -EINVAL; | |
1345 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1346 | return -EFAULT; | |
6ac7eb08 | 1347 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1348 | return -ENFILE; |
1349 | rtnl_lock(); | |
6bd52143 | 1350 | ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1351 | rtnl_unlock(); |
1352 | return ret; | |
1353 | ||
1354 | case MRT6_DEL_MIF: | |
1355 | if (optlen < sizeof(mifi_t)) | |
1356 | return -EINVAL; | |
1357 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1358 | return -EFAULT; | |
1359 | rtnl_lock(); | |
6bd52143 | 1360 | ret = mif6_delete(mrt, mifi, NULL); |
7bc570c8 YH |
1361 | rtnl_unlock(); |
1362 | return ret; | |
1363 | ||
1364 | /* | |
1365 | * Manipulate the forwarding caches. These live | |
1366 | * in a sort of kernel/user symbiosis. | |
1367 | */ | |
1368 | case MRT6_ADD_MFC: | |
1369 | case MRT6_DEL_MFC: | |
1370 | if (optlen < sizeof(mfc)) | |
1371 | return -EINVAL; | |
1372 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1373 | return -EFAULT; | |
1374 | rtnl_lock(); | |
1375 | if (optname == MRT6_DEL_MFC) | |
6bd52143 | 1376 | ret = ip6mr_mfc_delete(mrt, &mfc); |
7bc570c8 | 1377 | else |
6bd52143 | 1378 | ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1379 | rtnl_unlock(); |
1380 | return ret; | |
1381 | ||
14fb64e1 YH |
1382 | /* |
1383 | * Control PIM assert (to activate pim will activate assert) | |
1384 | */ | |
1385 | case MRT6_ASSERT: | |
1386 | { | |
1387 | int v; | |
1388 | if (get_user(v, (int __user *)optval)) | |
1389 | return -EFAULT; | |
6bd52143 | 1390 | mrt->mroute_do_assert = !!v; |
14fb64e1 YH |
1391 | return 0; |
1392 | } | |
1393 | ||
1394 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1395 | case MRT6_PIM: | |
1396 | { | |
a9f83bf3 | 1397 | int v; |
14fb64e1 YH |
1398 | if (get_user(v, (int __user *)optval)) |
1399 | return -EFAULT; | |
1400 | v = !!v; | |
1401 | rtnl_lock(); | |
1402 | ret = 0; | |
6bd52143 PM |
1403 | if (v != mrt->mroute_do_pim) { |
1404 | mrt->mroute_do_pim = v; | |
1405 | mrt->mroute_do_assert = v; | |
14fb64e1 YH |
1406 | } |
1407 | rtnl_unlock(); | |
1408 | return ret; | |
1409 | } | |
1410 | ||
1411 | #endif | |
7bc570c8 | 1412 | /* |
7d120c55 | 1413 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1414 | * set. |
1415 | */ | |
1416 | default: | |
1417 | return -ENOPROTOOPT; | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | /* | |
1422 | * Getsock opt support for the multicast routing system. | |
1423 | */ | |
1424 | ||
1425 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1426 | int __user *optlen) | |
1427 | { | |
1428 | int olr; | |
1429 | int val; | |
8229efda | 1430 | struct net *net = sock_net(sk); |
6bd52143 | 1431 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
1432 | |
1433 | switch (optname) { | |
1434 | case MRT6_VERSION: | |
1435 | val = 0x0305; | |
1436 | break; | |
14fb64e1 YH |
1437 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1438 | case MRT6_PIM: | |
6bd52143 | 1439 | val = mrt->mroute_do_pim; |
14fb64e1 YH |
1440 | break; |
1441 | #endif | |
1442 | case MRT6_ASSERT: | |
6bd52143 | 1443 | val = mrt->mroute_do_assert; |
14fb64e1 | 1444 | break; |
7bc570c8 YH |
1445 | default: |
1446 | return -ENOPROTOOPT; | |
1447 | } | |
1448 | ||
1449 | if (get_user(olr, optlen)) | |
1450 | return -EFAULT; | |
1451 | ||
1452 | olr = min_t(int, olr, sizeof(int)); | |
1453 | if (olr < 0) | |
1454 | return -EINVAL; | |
1455 | ||
1456 | if (put_user(olr, optlen)) | |
1457 | return -EFAULT; | |
1458 | if (copy_to_user(optval, &val, olr)) | |
1459 | return -EFAULT; | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * The IP multicast ioctl support routines. | |
1465 | */ | |
1466 | ||
1467 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1468 | { | |
1469 | struct sioc_sg_req6 sr; | |
1470 | struct sioc_mif_req6 vr; | |
1471 | struct mif_device *vif; | |
1472 | struct mfc6_cache *c; | |
8229efda | 1473 | struct net *net = sock_net(sk); |
6bd52143 | 1474 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
1475 | |
1476 | switch (cmd) { | |
1477 | case SIOCGETMIFCNT_IN6: | |
1478 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1479 | return -EFAULT; | |
6bd52143 | 1480 | if (vr.mifi >= mrt->maxvif) |
7bc570c8 YH |
1481 | return -EINVAL; |
1482 | read_lock(&mrt_lock); | |
6bd52143 PM |
1483 | vif = &mrt->vif6_table[vr.mifi]; |
1484 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
7bc570c8 YH |
1485 | vr.icount = vif->pkt_in; |
1486 | vr.ocount = vif->pkt_out; | |
1487 | vr.ibytes = vif->bytes_in; | |
1488 | vr.obytes = vif->bytes_out; | |
1489 | read_unlock(&mrt_lock); | |
1490 | ||
1491 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1492 | return -EFAULT; | |
1493 | return 0; | |
1494 | } | |
1495 | read_unlock(&mrt_lock); | |
1496 | return -EADDRNOTAVAIL; | |
1497 | case SIOCGETSGCNT_IN6: | |
1498 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1499 | return -EFAULT; | |
1500 | ||
1501 | read_lock(&mrt_lock); | |
6bd52143 | 1502 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1503 | if (c) { |
1504 | sr.pktcnt = c->mfc_un.res.pkt; | |
1505 | sr.bytecnt = c->mfc_un.res.bytes; | |
1506 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1507 | read_unlock(&mrt_lock); | |
1508 | ||
1509 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1510 | return -EFAULT; | |
1511 | return 0; | |
1512 | } | |
1513 | read_unlock(&mrt_lock); | |
1514 | return -EADDRNOTAVAIL; | |
1515 | default: | |
1516 | return -ENOIOCTLCMD; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | ||
1521 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1522 | { | |
adf30907 | 1523 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1524 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1525 | return dst_output(skb); |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * Processing handlers for ip6mr_forward | |
1530 | */ | |
1531 | ||
6bd52143 PM |
1532 | static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, |
1533 | struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
7bc570c8 YH |
1534 | { |
1535 | struct ipv6hdr *ipv6h; | |
6bd52143 | 1536 | struct mif_device *vif = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
1537 | struct net_device *dev; |
1538 | struct dst_entry *dst; | |
1539 | struct flowi fl; | |
1540 | ||
1541 | if (vif->dev == NULL) | |
1542 | goto out_free; | |
1543 | ||
14fb64e1 YH |
1544 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1545 | if (vif->flags & MIFF_REGISTER) { | |
1546 | vif->pkt_out++; | |
1547 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1548 | vif->dev->stats.tx_bytes += skb->len; |
1549 | vif->dev->stats.tx_packets++; | |
6bd52143 | 1550 | ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1551 | goto out_free; |
14fb64e1 YH |
1552 | } |
1553 | #endif | |
1554 | ||
7bc570c8 YH |
1555 | ipv6h = ipv6_hdr(skb); |
1556 | ||
1557 | fl = (struct flowi) { | |
1558 | .oif = vif->link, | |
1559 | .nl_u = { .ip6_u = | |
1560 | { .daddr = ipv6h->daddr, } | |
1561 | } | |
1562 | }; | |
1563 | ||
8229efda | 1564 | dst = ip6_route_output(net, NULL, &fl); |
7bc570c8 YH |
1565 | if (!dst) |
1566 | goto out_free; | |
1567 | ||
adf30907 ED |
1568 | skb_dst_drop(skb); |
1569 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1570 | |
1571 | /* | |
1572 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1573 | * not only before forwarding, but after forwarding on all output | |
1574 | * interfaces. It is clear, if mrouter runs a multicasting | |
1575 | * program, it should receive packets not depending to what interface | |
1576 | * program is joined. | |
1577 | * If we will not make it, the program will have to join on all | |
1578 | * interfaces. On the other hand, multihoming host (or router, but | |
1579 | * not mrouter) cannot join to more than one interface - it will | |
1580 | * result in receiving multiple packets. | |
1581 | */ | |
1582 | dev = vif->dev; | |
1583 | skb->dev = dev; | |
1584 | vif->pkt_out++; | |
1585 | vif->bytes_out += skb->len; | |
1586 | ||
1587 | /* We are about to write */ | |
1588 | /* XXX: extension headers? */ | |
1589 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1590 | goto out_free; | |
1591 | ||
1592 | ipv6h = ipv6_hdr(skb); | |
1593 | ipv6h->hop_limit--; | |
1594 | ||
1595 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1596 | ||
b2e0b385 | 1597 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1598 | ip6mr_forward2_finish); |
1599 | ||
1600 | out_free: | |
1601 | kfree_skb(skb); | |
1602 | return 0; | |
1603 | } | |
1604 | ||
6bd52143 | 1605 | static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) |
7bc570c8 YH |
1606 | { |
1607 | int ct; | |
6bd52143 PM |
1608 | |
1609 | for (ct = mrt->maxvif - 1; ct >= 0; ct--) { | |
1610 | if (mrt->vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1611 | break; |
1612 | } | |
1613 | return ct; | |
1614 | } | |
1615 | ||
6bd52143 PM |
1616 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
1617 | struct sk_buff *skb, struct mfc6_cache *cache) | |
7bc570c8 YH |
1618 | { |
1619 | int psend = -1; | |
1620 | int vif, ct; | |
1621 | ||
1622 | vif = cache->mf6c_parent; | |
1623 | cache->mfc_un.res.pkt++; | |
1624 | cache->mfc_un.res.bytes += skb->len; | |
1625 | ||
14fb64e1 YH |
1626 | /* |
1627 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1628 | */ | |
6bd52143 | 1629 | if (mrt->vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1630 | int true_vifi; |
1631 | ||
1632 | cache->mfc_un.res.wrong_if++; | |
6bd52143 | 1633 | true_vifi = ip6mr_find_vif(mrt, skb->dev); |
14fb64e1 | 1634 | |
6bd52143 | 1635 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
14fb64e1 YH |
1636 | /* pimsm uses asserts, when switching from RPT to SPT, |
1637 | so that we cannot check that packet arrived on an oif. | |
1638 | It is bad, but otherwise we would need to move pretty | |
1639 | large chunk of pimd to kernel. Ough... --ANK | |
1640 | */ | |
6bd52143 | 1641 | (mrt->mroute_do_pim || |
a21f3f99 | 1642 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
1643 | time_after(jiffies, |
1644 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1645 | cache->mfc_un.res.last_assert = jiffies; | |
6bd52143 | 1646 | ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
1647 | } |
1648 | goto dont_forward; | |
1649 | } | |
1650 | ||
6bd52143 PM |
1651 | mrt->vif6_table[vif].pkt_in++; |
1652 | mrt->vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
1653 | |
1654 | /* | |
1655 | * Forward the frame | |
1656 | */ | |
1657 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1658 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1659 | if (psend != -1) { | |
1660 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1661 | if (skb2) | |
6bd52143 | 1662 | ip6mr_forward2(net, mrt, skb2, cache, psend); |
7bc570c8 YH |
1663 | } |
1664 | psend = ct; | |
1665 | } | |
1666 | } | |
1667 | if (psend != -1) { | |
6bd52143 | 1668 | ip6mr_forward2(net, mrt, skb, cache, psend); |
7bc570c8 YH |
1669 | return 0; |
1670 | } | |
1671 | ||
14fb64e1 | 1672 | dont_forward: |
7bc570c8 YH |
1673 | kfree_skb(skb); |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | ||
1678 | /* | |
1679 | * Multicast packets for forwarding arrive here | |
1680 | */ | |
1681 | ||
1682 | int ip6_mr_input(struct sk_buff *skb) | |
1683 | { | |
1684 | struct mfc6_cache *cache; | |
8229efda | 1685 | struct net *net = dev_net(skb->dev); |
6bd52143 | 1686 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 YH |
1687 | |
1688 | read_lock(&mrt_lock); | |
6bd52143 | 1689 | cache = ip6mr_cache_find(mrt, |
8229efda | 1690 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
7bc570c8 YH |
1691 | |
1692 | /* | |
1693 | * No usable cache entry | |
1694 | */ | |
1695 | if (cache == NULL) { | |
1696 | int vif; | |
1697 | ||
6bd52143 | 1698 | vif = ip6mr_find_vif(mrt, skb->dev); |
7bc570c8 | 1699 | if (vif >= 0) { |
6bd52143 | 1700 | int err = ip6mr_cache_unresolved(mrt, vif, skb); |
7bc570c8 YH |
1701 | read_unlock(&mrt_lock); |
1702 | ||
1703 | return err; | |
1704 | } | |
1705 | read_unlock(&mrt_lock); | |
1706 | kfree_skb(skb); | |
1707 | return -ENODEV; | |
1708 | } | |
1709 | ||
6bd52143 | 1710 | ip6_mr_forward(net, mrt, skb, cache); |
7bc570c8 YH |
1711 | |
1712 | read_unlock(&mrt_lock); | |
1713 | ||
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | ||
1718 | static int | |
6bd52143 PM |
1719 | ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
1720 | struct mfc6_cache *c, struct rtmsg *rtm) | |
7bc570c8 YH |
1721 | { |
1722 | int ct; | |
1723 | struct rtnexthop *nhp; | |
549e028d | 1724 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
1725 | struct rtattr *mp_head; |
1726 | ||
7438189b ND |
1727 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1728 | if (c->mf6c_parent > MAXMIFS) | |
1729 | return -ENOENT; | |
1730 | ||
6bd52143 PM |
1731 | if (MIF_EXISTS(mrt, c->mf6c_parent)) |
1732 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex); | |
7bc570c8 YH |
1733 | |
1734 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
1735 | ||
1736 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
6bd52143 | 1737 | if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
7bc570c8 YH |
1738 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1739 | goto rtattr_failure; | |
1740 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1741 | nhp->rtnh_flags = 0; | |
1742 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
6bd52143 | 1743 | nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
1744 | nhp->rtnh_len = sizeof(*nhp); |
1745 | } | |
1746 | } | |
1747 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 1748 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
1749 | rtm->rtm_type = RTN_MULTICAST; |
1750 | return 1; | |
1751 | ||
1752 | rtattr_failure: | |
1753 | nlmsg_trim(skb, b); | |
1754 | return -EMSGSIZE; | |
1755 | } | |
1756 | ||
8229efda BT |
1757 | int ip6mr_get_route(struct net *net, |
1758 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
1759 | { |
1760 | int err; | |
6bd52143 | 1761 | struct mr6_table *mrt = net->ipv6.mrt6; |
7bc570c8 | 1762 | struct mfc6_cache *cache; |
adf30907 | 1763 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 YH |
1764 | |
1765 | read_lock(&mrt_lock); | |
6bd52143 | 1766 | cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
1767 | |
1768 | if (!cache) { | |
1769 | struct sk_buff *skb2; | |
1770 | struct ipv6hdr *iph; | |
1771 | struct net_device *dev; | |
1772 | int vif; | |
1773 | ||
1774 | if (nowait) { | |
1775 | read_unlock(&mrt_lock); | |
1776 | return -EAGAIN; | |
1777 | } | |
1778 | ||
1779 | dev = skb->dev; | |
6bd52143 | 1780 | if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
7bc570c8 YH |
1781 | read_unlock(&mrt_lock); |
1782 | return -ENODEV; | |
1783 | } | |
1784 | ||
1785 | /* really correct? */ | |
1786 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
1787 | if (!skb2) { | |
1788 | read_unlock(&mrt_lock); | |
1789 | return -ENOMEM; | |
1790 | } | |
1791 | ||
1792 | skb_reset_transport_header(skb2); | |
1793 | ||
1794 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
1795 | skb_reset_network_header(skb2); | |
1796 | ||
1797 | iph = ipv6_hdr(skb2); | |
1798 | iph->version = 0; | |
1799 | iph->priority = 0; | |
1800 | iph->flow_lbl[0] = 0; | |
1801 | iph->flow_lbl[1] = 0; | |
1802 | iph->flow_lbl[2] = 0; | |
1803 | iph->payload_len = 0; | |
1804 | iph->nexthdr = IPPROTO_NONE; | |
1805 | iph->hop_limit = 0; | |
1806 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
1807 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
1808 | ||
6bd52143 | 1809 | err = ip6mr_cache_unresolved(mrt, vif, skb2); |
7bc570c8 YH |
1810 | read_unlock(&mrt_lock); |
1811 | ||
1812 | return err; | |
1813 | } | |
1814 | ||
1815 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1816 | cache->mfc_flags |= MFC_NOTIFY; | |
1817 | ||
6bd52143 | 1818 | err = ip6mr_fill_mroute(mrt, skb, cache, rtm); |
7bc570c8 YH |
1819 | read_unlock(&mrt_lock); |
1820 | return err; | |
1821 | } | |
1822 |