1 | /* Linux multicast routing support |
2 | * Common logic shared by IPv4 [ipmr] and IPv6 [ip6mr] implementation |
3 | */ |
4 | |
5 | #include <linux/rhashtable.h> |
6 | #include <linux/mroute_base.h> |
7 | |
8 | /* Sets everything common except 'dev', since that is done under locking */ |
9 | void vif_device_init(struct vif_device *v, |
10 | struct net_device *dev, |
11 | unsigned long rate_limit, |
12 | unsigned char threshold, |
13 | unsigned short flags, |
14 | unsigned short get_iflink_mask) |
15 | { |
16 | v->dev = NULL; |
17 | v->bytes_in = 0; |
18 | v->bytes_out = 0; |
19 | v->pkt_in = 0; |
20 | v->pkt_out = 0; |
21 | v->rate_limit = rate_limit; |
22 | v->flags = flags; |
23 | v->threshold = threshold; |
24 | if (v->flags & get_iflink_mask) |
25 | v->link = dev_get_iflink(dev); |
26 | else |
27 | v->link = dev->ifindex; |
28 | } |
29 | EXPORT_SYMBOL(vif_device_init); |
30 | |
31 | struct mr_table * |
32 | mr_table_alloc(struct net *net, u32 id, |
33 | struct mr_table_ops *ops, |
34 | void (*expire_func)(struct timer_list *t), |
35 | void (*table_set)(struct mr_table *mrt, |
36 | struct net *net)) |
37 | { |
38 | struct mr_table *mrt; |
39 | int err; |
40 | |
41 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); |
42 | if (!mrt) |
43 | return ERR_PTR(-ENOMEM); |
44 | mrt->id = id; |
45 | write_pnet(&mrt->net, net); |
46 | |
47 | mrt->ops = *ops; |
48 | err = rhltable_init(&mrt->mfc_hash, mrt->ops.rht_params); |
49 | if (err) { |
50 | kfree(mrt); |
51 | return ERR_PTR(err); |
52 | } |
53 | INIT_LIST_HEAD(&mrt->mfc_cache_list); |
54 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); |
55 | |
56 | timer_setup(&mrt->ipmr_expire_timer, expire_func, 0); |
57 | |
58 | mrt->mroute_reg_vif_num = -1; |
59 | table_set(mrt, net); |
60 | return mrt; |
61 | } |
62 | EXPORT_SYMBOL(mr_table_alloc); |
63 | |
64 | void *mr_mfc_find_parent(struct mr_table *mrt, void *hasharg, int parent) |
65 | { |
66 | struct rhlist_head *tmp, *list; |
67 | struct mr_mfc *c; |
68 | |
69 | list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params); |
70 | rhl_for_each_entry_rcu(c, tmp, list, mnode) |
71 | if (parent == -1 || parent == c->mfc_parent) |
72 | return c; |
73 | |
74 | return NULL; |
75 | } |
76 | EXPORT_SYMBOL(mr_mfc_find_parent); |
77 | |
78 | void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi) |
79 | { |
80 | struct rhlist_head *tmp, *list; |
81 | struct mr_mfc *c; |
82 | |
83 | list = rhltable_lookup(&mrt->mfc_hash, mrt->ops.cmparg_any, |
84 | *mrt->ops.rht_params); |
85 | rhl_for_each_entry_rcu(c, tmp, list, mnode) |
86 | if (c->mfc_un.res.ttls[vifi] < 255) |
87 | return c; |
88 | |
89 | return NULL; |
90 | } |
91 | EXPORT_SYMBOL(mr_mfc_find_any_parent); |
92 | |
93 | void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg) |
94 | { |
95 | struct rhlist_head *tmp, *list; |
96 | struct mr_mfc *c, *proxy; |
97 | |
98 | list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params); |
99 | rhl_for_each_entry_rcu(c, tmp, list, mnode) { |
100 | if (c->mfc_un.res.ttls[vifi] < 255) |
101 | return c; |
102 | |
103 | /* It's ok if the vifi is part of the static tree */ |
104 | proxy = mr_mfc_find_any_parent(mrt, c->mfc_parent); |
105 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) |
106 | return c; |
107 | } |
108 | |
109 | return mr_mfc_find_any_parent(mrt, vifi); |
110 | } |
111 | EXPORT_SYMBOL(mr_mfc_find_any); |
112 | |
113 | #ifdef CONFIG_PROC_FS |
114 | void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos) |
115 | { |
116 | struct mr_table *mrt = iter->mrt; |
117 | |
118 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { |
119 | if (!VIF_EXISTS(mrt, iter->ct)) |
120 | continue; |
121 | if (pos-- == 0) |
122 | return &mrt->vif_table[iter->ct]; |
123 | } |
124 | return NULL; |
125 | } |
126 | EXPORT_SYMBOL(mr_vif_seq_idx); |
127 | |
128 | void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
129 | { |
130 | struct mr_vif_iter *iter = seq->private; |
131 | struct net *net = seq_file_net(seq); |
132 | struct mr_table *mrt = iter->mrt; |
133 | |
134 | ++*pos; |
135 | if (v == SEQ_START_TOKEN) |
136 | return mr_vif_seq_idx(net, iter, 0); |
137 | |
138 | while (++iter->ct < mrt->maxvif) { |
139 | if (!VIF_EXISTS(mrt, iter->ct)) |
140 | continue; |
141 | return &mrt->vif_table[iter->ct]; |
142 | } |
143 | return NULL; |
144 | } |
145 | EXPORT_SYMBOL(mr_vif_seq_next); |
146 | |
147 | void *mr_mfc_seq_idx(struct net *net, |
148 | struct mr_mfc_iter *it, loff_t pos) |
149 | { |
150 | struct mr_table *mrt = it->mrt; |
151 | struct mr_mfc *mfc; |
152 | |
153 | rcu_read_lock(); |
154 | it->cache = &mrt->mfc_cache_list; |
155 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) |
156 | if (pos-- == 0) |
157 | return mfc; |
158 | rcu_read_unlock(); |
159 | |
160 | spin_lock_bh(it->lock); |
161 | it->cache = &mrt->mfc_unres_queue; |
162 | list_for_each_entry(mfc, it->cache, list) |
163 | if (pos-- == 0) |
164 | return mfc; |
165 | spin_unlock_bh(it->lock); |
166 | |
167 | it->cache = NULL; |
168 | return NULL; |
169 | } |
170 | EXPORT_SYMBOL(mr_mfc_seq_idx); |
171 | |
172 | void *mr_mfc_seq_next(struct seq_file *seq, void *v, |
173 | loff_t *pos) |
174 | { |
175 | struct mr_mfc_iter *it = seq->private; |
176 | struct net *net = seq_file_net(seq); |
177 | struct mr_table *mrt = it->mrt; |
178 | struct mr_mfc *c = v; |
179 | |
180 | ++*pos; |
181 | |
182 | if (v == SEQ_START_TOKEN) |
183 | return mr_mfc_seq_idx(net, seq->private, 0); |
184 | |
185 | if (c->list.next != it->cache) |
186 | return list_entry(c->list.next, struct mr_mfc, list); |
187 | |
188 | if (it->cache == &mrt->mfc_unres_queue) |
189 | goto end_of_list; |
190 | |
191 | /* exhausted cache_array, show unresolved */ |
192 | rcu_read_unlock(); |
193 | it->cache = &mrt->mfc_unres_queue; |
194 | |
195 | spin_lock_bh(it->lock); |
196 | if (!list_empty(it->cache)) |
197 | return list_first_entry(it->cache, struct mr_mfc, list); |
198 | |
199 | end_of_list: |
200 | spin_unlock_bh(it->lock); |
201 | it->cache = NULL; |
202 | |
203 | return NULL; |
204 | } |
205 | EXPORT_SYMBOL(mr_mfc_seq_next); |
206 | #endif |
207 | |
208 | int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
209 | struct mr_mfc *c, struct rtmsg *rtm) |
210 | { |
211 | struct rta_mfc_stats mfcs; |
212 | struct nlattr *mp_attr; |
213 | struct rtnexthop *nhp; |
214 | unsigned long lastuse; |
215 | int ct; |
216 | |
217 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
218 | if (c->mfc_parent >= MAXVIFS) { |
219 | rtm->rtm_flags |= RTNH_F_UNRESOLVED; |
220 | return -ENOENT; |
221 | } |
222 | |
223 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
224 | nla_put_u32(skb, RTA_IIF, |
225 | mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) |
226 | return -EMSGSIZE; |
227 | |
228 | if (c->mfc_flags & MFC_OFFLOAD) |
229 | rtm->rtm_flags |= RTNH_F_OFFLOAD; |
230 | |
231 | mp_attr = nla_nest_start(skb, RTA_MULTIPATH); |
232 | if (!mp_attr) |
233 | return -EMSGSIZE; |
234 | |
235 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
236 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
237 | struct vif_device *vif; |
238 | |
239 | nhp = nla_reserve_nohdr(skb, sizeof(*nhp)); |
240 | if (!nhp) { |
241 | nla_nest_cancel(skb, mp_attr); |
242 | return -EMSGSIZE; |
243 | } |
244 | |
245 | nhp->rtnh_flags = 0; |
246 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
247 | vif = &mrt->vif_table[ct]; |
248 | nhp->rtnh_ifindex = vif->dev->ifindex; |
249 | nhp->rtnh_len = sizeof(*nhp); |
250 | } |
251 | } |
252 | |
253 | nla_nest_end(skb, mp_attr); |
254 | |
255 | lastuse = READ_ONCE(c->mfc_un.res.lastuse); |
256 | lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0; |
257 | |
258 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
259 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; |
260 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; |
261 | if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) || |
262 | nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse), |
263 | RTA_PAD)) |
264 | return -EMSGSIZE; |
265 | |
266 | rtm->rtm_type = RTN_MULTICAST; |
267 | return 1; |
268 | } |
269 | EXPORT_SYMBOL(mr_fill_mroute); |
270 | |
271 | static bool mr_mfc_uses_dev(const struct mr_table *mrt, |
272 | const struct mr_mfc *c, |
273 | const struct net_device *dev) |
274 | { |
275 | int ct; |
276 | |
277 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
278 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
279 | const struct vif_device *vif; |
280 | |
281 | vif = &mrt->vif_table[ct]; |
282 | if (vif->dev == dev) |
283 | return true; |
284 | } |
285 | } |
286 | return false; |
287 | } |
288 | |
289 | int mr_table_dump(struct mr_table *mrt, struct sk_buff *skb, |
290 | struct netlink_callback *cb, |
291 | int (*fill)(struct mr_table *mrt, struct sk_buff *skb, |
292 | u32 portid, u32 seq, struct mr_mfc *c, |
293 | int cmd, int flags), |
294 | spinlock_t *lock, struct fib_dump_filter *filter) |
295 | { |
296 | unsigned int e = 0, s_e = cb->args[1]; |
297 | unsigned int flags = NLM_F_MULTI; |
298 | struct mr_mfc *mfc; |
299 | int err; |
300 | |
301 | if (filter->filter_set) |
302 | flags |= NLM_F_DUMP_FILTERED; |
303 | |
304 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) { |
305 | if (e < s_e) |
306 | goto next_entry; |
307 | if (filter->dev && |
308 | !mr_mfc_uses_dev(mrt, mfc, filter->dev)) |
309 | goto next_entry; |
310 | |
311 | err = fill(mrt, skb, NETLINK_CB(cb->skb).portid, |
312 | cb->nlh->nlmsg_seq, mfc, RTM_NEWROUTE, flags); |
313 | if (err < 0) |
314 | goto out; |
315 | next_entry: |
316 | e++; |
317 | } |
318 | |
319 | spin_lock_bh(lock); |
320 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { |
321 | if (e < s_e) |
322 | goto next_entry2; |
323 | if (filter->dev && |
324 | !mr_mfc_uses_dev(mrt, mfc, filter->dev)) |
325 | goto next_entry2; |
326 | |
327 | err = fill(mrt, skb, NETLINK_CB(cb->skb).portid, |
328 | cb->nlh->nlmsg_seq, mfc, RTM_NEWROUTE, flags); |
329 | if (err < 0) { |
330 | spin_unlock_bh(lock); |
331 | goto out; |
332 | } |
333 | next_entry2: |
334 | e++; |
335 | } |
336 | spin_unlock_bh(lock); |
337 | err = 0; |
338 | e = 0; |
339 | |
340 | out: |
341 | cb->args[1] = e; |
342 | return err; |
343 | } |
344 | EXPORT_SYMBOL(mr_table_dump); |
345 | |
346 | int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb, |
347 | struct mr_table *(*iter)(struct net *net, |
348 | struct mr_table *mrt), |
349 | int (*fill)(struct mr_table *mrt, |
350 | struct sk_buff *skb, |
351 | u32 portid, u32 seq, struct mr_mfc *c, |
352 | int cmd, int flags), |
353 | spinlock_t *lock, struct fib_dump_filter *filter) |
354 | { |
355 | unsigned int t = 0, s_t = cb->args[0]; |
356 | struct net *net = sock_net(skb->sk); |
357 | struct mr_table *mrt; |
358 | int err; |
359 | |
360 | /* multicast does not track protocol or have route type other |
361 | * than RTN_MULTICAST |
362 | */ |
363 | if (filter->filter_set) { |
364 | if (filter->protocol || filter->flags || |
365 | (filter->rt_type && filter->rt_type != RTN_MULTICAST)) |
366 | return skb->len; |
367 | } |
368 | |
369 | rcu_read_lock(); |
370 | for (mrt = iter(net, NULL); mrt; mrt = iter(net, mrt)) { |
371 | if (t < s_t) |
372 | goto next_table; |
373 | |
374 | err = mr_table_dump(mrt, skb, cb, fill, lock, filter); |
375 | if (err < 0) |
376 | break; |
377 | next_table: |
378 | t++; |
379 | } |
380 | rcu_read_unlock(); |
381 | |
382 | cb->args[0] = t; |
383 | |
384 | return skb->len; |
385 | } |
386 | EXPORT_SYMBOL(mr_rtm_dumproute); |
387 | |
388 | int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family, |
389 | int (*rules_dump)(struct net *net, |
390 | struct notifier_block *nb), |
391 | struct mr_table *(*mr_iter)(struct net *net, |
392 | struct mr_table *mrt), |
393 | rwlock_t *mrt_lock) |
394 | { |
395 | struct mr_table *mrt; |
396 | int err; |
397 | |
398 | err = rules_dump(net, nb); |
399 | if (err) |
400 | return err; |
401 | |
402 | for (mrt = mr_iter(net, NULL); mrt; mrt = mr_iter(net, mrt)) { |
403 | struct vif_device *v = &mrt->vif_table[0]; |
404 | struct mr_mfc *mfc; |
405 | int vifi; |
406 | |
407 | /* Notifiy on table VIF entries */ |
408 | read_lock(mrt_lock); |
409 | for (vifi = 0; vifi < mrt->maxvif; vifi++, v++) { |
410 | if (!v->dev) |
411 | continue; |
412 | |
413 | mr_call_vif_notifier(nb, net, family, |
414 | FIB_EVENT_VIF_ADD, |
415 | v, vifi, mrt->id); |
416 | } |
417 | read_unlock(mrt_lock); |
418 | |
419 | /* Notify on table MFC entries */ |
420 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) |
421 | mr_call_mfc_notifier(nb, net, family, |
422 | FIB_EVENT_ENTRY_ADD, |
423 | mfc, mrt->id); |
424 | } |
425 | |
426 | return 0; |
427 | } |
428 | EXPORT_SYMBOL(mr_dump); |
429 | |