Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_api.c Packet scheduler API. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * Fixes: |
| 12 | * |
| 13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. |
| 14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support |
| 15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/module.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/init.h> |
| 25 | #include <linux/proc_fs.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | #include <linux/kmod.h> |
| 28 | #include <linux/list.h> |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 29 | #include <linux/hrtimer.h> |
Jarek Poplawski | 25bfcd5 | 2008-08-18 20:53:34 -0700 | [diff] [blame] | 30 | #include <linux/lockdep.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 32 | #include <linux/hashtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 34 | #include <net/net_namespace.h> |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 35 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 36 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <net/pkt_sched.h> |
| 38 | |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 39 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
| 40 | struct nlmsghdr *n, u32 clid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | struct Qdisc *old, struct Qdisc *new); |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 42 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
| 43 | struct nlmsghdr *n, struct Qdisc *q, |
| 44 | unsigned long cl, int event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | |
| 48 | Short review. |
| 49 | ------------- |
| 50 | |
| 51 | This file consists of two interrelated parts: |
| 52 | |
| 53 | 1. queueing disciplines manager frontend. |
| 54 | 2. traffic classes manager frontend. |
| 55 | |
| 56 | Generally, queueing discipline ("qdisc") is a black box, |
| 57 | which is able to enqueue packets and to dequeue them (when |
| 58 | device is ready to send something) in order and at times |
| 59 | determined by algorithm hidden in it. |
| 60 | |
| 61 | qdisc's are divided to two categories: |
| 62 | - "queues", which have no internal structure visible from outside. |
| 63 | - "schedulers", which split all the packets to "traffic classes", |
| 64 | using "packet classifiers" (look at cls_api.c) |
| 65 | |
| 66 | In turn, classes may have child qdiscs (as rule, queues) |
| 67 | attached to them etc. etc. etc. |
| 68 | |
| 69 | The goal of the routines in this file is to translate |
| 70 | information supplied by user in the form of handles |
| 71 | to more intelligible for kernel form, to make some sanity |
| 72 | checks and part of work, which is common to all qdiscs |
| 73 | and to provide rtnetlink notifications. |
| 74 | |
| 75 | All real intelligent work is done inside qdisc modules. |
| 76 | |
| 77 | |
| 78 | |
| 79 | Every discipline has two major routines: enqueue and dequeue. |
| 80 | |
| 81 | ---dequeue |
| 82 | |
| 83 | dequeue usually returns a skb to send. It is allowed to return NULL, |
| 84 | but it does not mean that queue is empty, it just means that |
| 85 | discipline does not want to send anything this time. |
| 86 | Queue is really empty if q->q.qlen == 0. |
| 87 | For complicated disciplines with multiple queues q->q is not |
| 88 | real packet queue, but however q->q.qlen must be valid. |
| 89 | |
| 90 | ---enqueue |
| 91 | |
| 92 | enqueue returns 0, if packet was enqueued successfully. |
| 93 | If packet (this one or another one) was dropped, it returns |
| 94 | not zero error code. |
| 95 | NET_XMIT_DROP - this packet dropped |
| 96 | Expected action: do not backoff, but wait until queue will clear. |
| 97 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. |
| 98 | Expected action: backoff or ignore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | Auxiliary routines: |
| 101 | |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 102 | ---peek |
| 103 | |
| 104 | like dequeue but without removing a packet from the queue |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | ---reset |
| 107 | |
| 108 | returns qdisc to initial state: purge all buffers, clear all |
| 109 | timers, counters (except for statistics) etc. |
| 110 | |
| 111 | ---init |
| 112 | |
| 113 | initializes newly created qdisc. |
| 114 | |
| 115 | ---destroy |
| 116 | |
| 117 | destroys resources allocated by init and during lifetime of qdisc. |
| 118 | |
| 119 | ---change |
| 120 | |
| 121 | changes qdisc parameters. |
| 122 | */ |
| 123 | |
| 124 | /* Protects list of registered TC modules. It is pure SMP lock. */ |
| 125 | static DEFINE_RWLOCK(qdisc_mod_lock); |
| 126 | |
| 127 | |
| 128 | /************************************************ |
| 129 | * Queueing disciplines manipulation. * |
| 130 | ************************************************/ |
| 131 | |
| 132 | |
| 133 | /* The list of all installed queueing disciplines. */ |
| 134 | |
| 135 | static struct Qdisc_ops *qdisc_base; |
| 136 | |
Zhi Yong Wu | 21eb218 | 2014-01-01 04:34:51 +0800 | [diff] [blame] | 137 | /* Register/unregister queueing discipline */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | int register_qdisc(struct Qdisc_ops *qops) |
| 140 | { |
| 141 | struct Qdisc_ops *q, **qp; |
| 142 | int rc = -EEXIST; |
| 143 | |
| 144 | write_lock(&qdisc_mod_lock); |
| 145 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
| 146 | if (!strcmp(qops->id, q->id)) |
| 147 | goto out; |
| 148 | |
| 149 | if (qops->enqueue == NULL) |
| 150 | qops->enqueue = noop_qdisc_ops.enqueue; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 151 | if (qops->peek == NULL) { |
Jarek Poplawski | 68fd26b | 2010-08-09 12:18:48 +0000 | [diff] [blame] | 152 | if (qops->dequeue == NULL) |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 153 | qops->peek = noop_qdisc_ops.peek; |
Jarek Poplawski | 68fd26b | 2010-08-09 12:18:48 +0000 | [diff] [blame] | 154 | else |
| 155 | goto out_einval; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (qops->dequeue == NULL) |
| 158 | qops->dequeue = noop_qdisc_ops.dequeue; |
| 159 | |
Jarek Poplawski | 68fd26b | 2010-08-09 12:18:48 +0000 | [diff] [blame] | 160 | if (qops->cl_ops) { |
| 161 | const struct Qdisc_class_ops *cops = qops->cl_ops; |
| 162 | |
Jarek Poplawski | 3e9e5a5 | 2010-08-10 22:31:20 +0000 | [diff] [blame] | 163 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
Jarek Poplawski | 68fd26b | 2010-08-09 12:18:48 +0000 | [diff] [blame] | 164 | goto out_einval; |
| 165 | |
| 166 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) |
| 167 | goto out_einval; |
| 168 | } |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | qops->next = NULL; |
| 171 | *qp = qops; |
| 172 | rc = 0; |
| 173 | out: |
| 174 | write_unlock(&qdisc_mod_lock); |
| 175 | return rc; |
Jarek Poplawski | 68fd26b | 2010-08-09 12:18:48 +0000 | [diff] [blame] | 176 | |
| 177 | out_einval: |
| 178 | rc = -EINVAL; |
| 179 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 181 | EXPORT_SYMBOL(register_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | int unregister_qdisc(struct Qdisc_ops *qops) |
| 184 | { |
| 185 | struct Qdisc_ops *q, **qp; |
| 186 | int err = -ENOENT; |
| 187 | |
| 188 | write_lock(&qdisc_mod_lock); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 189 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | if (q == qops) |
| 191 | break; |
| 192 | if (q) { |
| 193 | *qp = q->next; |
| 194 | q->next = NULL; |
| 195 | err = 0; |
| 196 | } |
| 197 | write_unlock(&qdisc_mod_lock); |
| 198 | return err; |
| 199 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 200 | EXPORT_SYMBOL(unregister_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 202 | /* Get default qdisc if not otherwise specified */ |
| 203 | void qdisc_get_default(char *name, size_t len) |
| 204 | { |
| 205 | read_lock(&qdisc_mod_lock); |
| 206 | strlcpy(name, default_qdisc_ops->id, len); |
| 207 | read_unlock(&qdisc_mod_lock); |
| 208 | } |
| 209 | |
| 210 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) |
| 211 | { |
| 212 | struct Qdisc_ops *q = NULL; |
| 213 | |
| 214 | for (q = qdisc_base; q; q = q->next) { |
| 215 | if (!strcmp(name, q->id)) { |
| 216 | if (!try_module_get(q->owner)) |
| 217 | q = NULL; |
| 218 | break; |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | return q; |
| 223 | } |
| 224 | |
| 225 | /* Set new default qdisc to use */ |
| 226 | int qdisc_set_default(const char *name) |
| 227 | { |
| 228 | const struct Qdisc_ops *ops; |
| 229 | |
| 230 | if (!capable(CAP_NET_ADMIN)) |
| 231 | return -EPERM; |
| 232 | |
| 233 | write_lock(&qdisc_mod_lock); |
| 234 | ops = qdisc_lookup_default(name); |
| 235 | if (!ops) { |
| 236 | /* Not found, drop lock and try to load module */ |
| 237 | write_unlock(&qdisc_mod_lock); |
| 238 | request_module("sch_%s", name); |
| 239 | write_lock(&qdisc_mod_lock); |
| 240 | |
| 241 | ops = qdisc_lookup_default(name); |
| 242 | } |
| 243 | |
| 244 | if (ops) { |
| 245 | /* Set new default */ |
| 246 | module_put(default_qdisc_ops->owner); |
| 247 | default_qdisc_ops = ops; |
| 248 | } |
| 249 | write_unlock(&qdisc_mod_lock); |
| 250 | |
| 251 | return ops ? 0 : -ENOENT; |
| 252 | } |
| 253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | /* We know handle. Find qdisc among all qdisc's attached to device |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 255 | * (root qdisc, all its children, children of children etc.) |
| 256 | * Note: caller either uses rtnl or rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | */ |
| 258 | |
Hannes Eder | 6113b74 | 2008-11-28 03:06:46 -0800 | [diff] [blame] | 259 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 260 | { |
| 261 | struct Qdisc *q; |
| 262 | |
Jiri Kosina | 69012ae | 2016-08-16 23:52:58 +0200 | [diff] [blame] | 263 | if (!qdisc_dev(root)) |
| 264 | return (root->handle == handle ? root : NULL); |
| 265 | |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 266 | if (!(root->flags & TCQ_F_BUILTIN) && |
| 267 | root->handle == handle) |
| 268 | return root; |
| 269 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 270 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 271 | if (q->handle == handle) |
| 272 | return q; |
| 273 | } |
| 274 | return NULL; |
| 275 | } |
| 276 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 277 | void qdisc_hash_add(struct Qdisc *q) |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 278 | { |
Eric Dumazet | 3731436 | 2014-03-08 08:01:19 -0800 | [diff] [blame] | 279 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
| 280 | struct Qdisc *root = qdisc_dev(q)->qdisc; |
Eric Dumazet | e57a784 | 2013-12-12 15:41:56 -0800 | [diff] [blame] | 281 | |
Eric Dumazet | 3731436 | 2014-03-08 08:01:19 -0800 | [diff] [blame] | 282 | WARN_ON_ONCE(root == &noop_qdisc); |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 283 | ASSERT_RTNL(); |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 284 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
Eric Dumazet | 3731436 | 2014-03-08 08:01:19 -0800 | [diff] [blame] | 285 | } |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 286 | } |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 287 | EXPORT_SYMBOL(qdisc_hash_add); |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 288 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 289 | void qdisc_hash_del(struct Qdisc *q) |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 290 | { |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 291 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
| 292 | ASSERT_RTNL(); |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 293 | hash_del_rcu(&q->hash); |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 294 | } |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 295 | } |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 296 | EXPORT_SYMBOL(qdisc_hash_del); |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 297 | |
David S. Miller | ead81cc | 2008-07-17 00:50:32 -0700 | [diff] [blame] | 298 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 299 | { |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 300 | struct Qdisc *q; |
| 301 | |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 302 | q = qdisc_match_from_root(dev->qdisc, handle); |
| 303 | if (q) |
| 304 | goto out; |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 305 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 306 | if (dev_ingress_queue(dev)) |
| 307 | q = qdisc_match_from_root( |
| 308 | dev_ingress_queue(dev)->qdisc_sleeping, |
| 309 | handle); |
Jarek Poplawski | f6486d4 | 2008-11-25 13:56:06 -0800 | [diff] [blame] | 310 | out: |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 311 | return q; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
| 315 | { |
| 316 | unsigned long cl; |
| 317 | struct Qdisc *leaf; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 318 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | if (cops == NULL) |
| 321 | return NULL; |
| 322 | cl = cops->get(p, classid); |
| 323 | |
| 324 | if (cl == 0) |
| 325 | return NULL; |
| 326 | leaf = cops->leaf(p, cl); |
| 327 | cops->put(p, cl); |
| 328 | return leaf; |
| 329 | } |
| 330 | |
| 331 | /* Find queueing discipline by name */ |
| 332 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 333 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
| 335 | struct Qdisc_ops *q = NULL; |
| 336 | |
| 337 | if (kind) { |
| 338 | read_lock(&qdisc_mod_lock); |
| 339 | for (q = qdisc_base; q; q = q->next) { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 340 | if (nla_strcmp(kind, q->id) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | if (!try_module_get(q->owner)) |
| 342 | q = NULL; |
| 343 | break; |
| 344 | } |
| 345 | } |
| 346 | read_unlock(&qdisc_mod_lock); |
| 347 | } |
| 348 | return q; |
| 349 | } |
| 350 | |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 351 | /* The linklayer setting were not transferred from iproute2, in older |
| 352 | * versions, and the rate tables lookup systems have been dropped in |
| 353 | * the kernel. To keep backward compatible with older iproute2 tc |
| 354 | * utils, we detect the linklayer setting by detecting if the rate |
| 355 | * table were modified. |
| 356 | * |
| 357 | * For linklayer ATM table entries, the rate table will be aligned to |
| 358 | * 48 bytes, thus some table entries will contain the same value. The |
| 359 | * mpu (min packet unit) is also encoded into the old rate table, thus |
| 360 | * starting from the mpu, we find low and high table entries for |
| 361 | * mapping this cell. If these entries contain the same value, when |
| 362 | * the rate tables have been modified for linklayer ATM. |
| 363 | * |
| 364 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, |
| 365 | * and then roundup to the next cell, calc the table entry one below, |
| 366 | * and compare. |
| 367 | */ |
| 368 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) |
| 369 | { |
| 370 | int low = roundup(r->mpu, 48); |
| 371 | int high = roundup(low+1, 48); |
| 372 | int cell_low = low >> r->cell_log; |
| 373 | int cell_high = (high >> r->cell_log) - 1; |
| 374 | |
| 375 | /* rtab is too inaccurate at rates > 100Mbit/s */ |
| 376 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { |
| 377 | pr_debug("TC linklayer: Giving up ATM detection\n"); |
| 378 | return TC_LINKLAYER_ETHERNET; |
| 379 | } |
| 380 | |
| 381 | if ((cell_high > cell_low) && (cell_high < 256) |
| 382 | && (rtab[cell_low] == rtab[cell_high])) { |
| 383 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", |
| 384 | cell_low, cell_high, rtab[cell_high]); |
| 385 | return TC_LINKLAYER_ATM; |
| 386 | } |
| 387 | return TC_LINKLAYER_ETHERNET; |
| 388 | } |
| 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | static struct qdisc_rate_table *qdisc_rtab_list; |
| 391 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 392 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
| 393 | struct nlattr *tab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
| 395 | struct qdisc_rate_table *rtab; |
| 396 | |
Eric Dumazet | 40edeff | 2013-06-02 11:15:55 +0000 | [diff] [blame] | 397 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
| 398 | nla_len(tab) != TC_RTAB_SIZE) |
| 399 | return NULL; |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
Eric Dumazet | 40edeff | 2013-06-02 11:15:55 +0000 | [diff] [blame] | 402 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
| 403 | !memcmp(&rtab->data, nla_data(tab), 1024)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | rtab->refcnt++; |
| 405 | return rtab; |
| 406 | } |
| 407 | } |
| 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
| 410 | if (rtab) { |
| 411 | rtab->rate = *r; |
| 412 | rtab->refcnt = 1; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 413 | memcpy(rtab->data, nla_data(tab), 1024); |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 414 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
| 415 | r->linklayer = __detect_linklayer(r, rtab->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | rtab->next = qdisc_rtab_list; |
| 417 | qdisc_rtab_list = rtab; |
| 418 | } |
| 419 | return rtab; |
| 420 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 421 | EXPORT_SYMBOL(qdisc_get_rtab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | void qdisc_put_rtab(struct qdisc_rate_table *tab) |
| 424 | { |
| 425 | struct qdisc_rate_table *rtab, **rtabp; |
| 426 | |
| 427 | if (!tab || --tab->refcnt) |
| 428 | return; |
| 429 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 430 | for (rtabp = &qdisc_rtab_list; |
| 431 | (rtab = *rtabp) != NULL; |
| 432 | rtabp = &rtab->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (rtab == tab) { |
| 434 | *rtabp = rtab->next; |
| 435 | kfree(rtab); |
| 436 | return; |
| 437 | } |
| 438 | } |
| 439 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 440 | EXPORT_SYMBOL(qdisc_put_rtab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 442 | static LIST_HEAD(qdisc_stab_list); |
| 443 | static DEFINE_SPINLOCK(qdisc_stab_lock); |
| 444 | |
| 445 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { |
| 446 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, |
| 447 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, |
| 448 | }; |
| 449 | |
| 450 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) |
| 451 | { |
| 452 | struct nlattr *tb[TCA_STAB_MAX + 1]; |
| 453 | struct qdisc_size_table *stab; |
| 454 | struct tc_sizespec *s; |
| 455 | unsigned int tsize = 0; |
| 456 | u16 *tab = NULL; |
| 457 | int err; |
| 458 | |
| 459 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); |
| 460 | if (err < 0) |
| 461 | return ERR_PTR(err); |
| 462 | if (!tb[TCA_STAB_BASE]) |
| 463 | return ERR_PTR(-EINVAL); |
| 464 | |
| 465 | s = nla_data(tb[TCA_STAB_BASE]); |
| 466 | |
| 467 | if (s->tsize > 0) { |
| 468 | if (!tb[TCA_STAB_DATA]) |
| 469 | return ERR_PTR(-EINVAL); |
| 470 | tab = nla_data(tb[TCA_STAB_DATA]); |
| 471 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); |
| 472 | } |
| 473 | |
Dan Carpenter | 00093fa | 2010-08-14 11:09:49 +0000 | [diff] [blame] | 474 | if (tsize != s->tsize || (!tab && tsize > 0)) |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 475 | return ERR_PTR(-EINVAL); |
| 476 | |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 477 | spin_lock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 478 | |
| 479 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
| 480 | if (memcmp(&stab->szopts, s, sizeof(*s))) |
| 481 | continue; |
| 482 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) |
| 483 | continue; |
| 484 | stab->refcnt++; |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 485 | spin_unlock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 486 | return stab; |
| 487 | } |
| 488 | |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 489 | spin_unlock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 490 | |
| 491 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
| 492 | if (!stab) |
| 493 | return ERR_PTR(-ENOMEM); |
| 494 | |
| 495 | stab->refcnt = 1; |
| 496 | stab->szopts = *s; |
| 497 | if (tsize > 0) |
| 498 | memcpy(stab->data, tab, tsize * sizeof(u16)); |
| 499 | |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 500 | spin_lock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 501 | list_add_tail(&stab->list, &qdisc_stab_list); |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 502 | spin_unlock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 503 | |
| 504 | return stab; |
| 505 | } |
| 506 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 507 | static void stab_kfree_rcu(struct rcu_head *head) |
| 508 | { |
| 509 | kfree(container_of(head, struct qdisc_size_table, rcu)); |
| 510 | } |
| 511 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 512 | void qdisc_put_stab(struct qdisc_size_table *tab) |
| 513 | { |
| 514 | if (!tab) |
| 515 | return; |
| 516 | |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 517 | spin_lock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 518 | |
| 519 | if (--tab->refcnt == 0) { |
| 520 | list_del(&tab->list); |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 521 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 522 | } |
| 523 | |
David S. Miller | f3b9605 | 2008-08-18 22:33:05 -0700 | [diff] [blame] | 524 | spin_unlock(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 525 | } |
| 526 | EXPORT_SYMBOL(qdisc_put_stab); |
| 527 | |
| 528 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) |
| 529 | { |
| 530 | struct nlattr *nest; |
| 531 | |
| 532 | nest = nla_nest_start(skb, TCA_STAB); |
Patrick McHardy | 3aa4614 | 2008-11-20 04:07:14 -0800 | [diff] [blame] | 533 | if (nest == NULL) |
| 534 | goto nla_put_failure; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 535 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
| 536 | goto nla_put_failure; |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 537 | nla_nest_end(skb, nest); |
| 538 | |
| 539 | return skb->len; |
| 540 | |
| 541 | nla_put_failure: |
| 542 | return -1; |
| 543 | } |
| 544 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 545 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
| 546 | const struct qdisc_size_table *stab) |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 547 | { |
| 548 | int pkt_len, slot; |
| 549 | |
| 550 | pkt_len = skb->len + stab->szopts.overhead; |
| 551 | if (unlikely(!stab->szopts.tsize)) |
| 552 | goto out; |
| 553 | |
| 554 | slot = pkt_len + stab->szopts.cell_align; |
| 555 | if (unlikely(slot < 0)) |
| 556 | slot = 0; |
| 557 | |
| 558 | slot >>= stab->szopts.cell_log; |
| 559 | if (likely(slot < stab->szopts.tsize)) |
| 560 | pkt_len = stab->data[slot]; |
| 561 | else |
| 562 | pkt_len = stab->data[stab->szopts.tsize - 1] * |
| 563 | (slot / stab->szopts.tsize) + |
| 564 | stab->data[slot % stab->szopts.tsize]; |
| 565 | |
| 566 | pkt_len <<= stab->szopts.size_log; |
| 567 | out: |
| 568 | if (unlikely(pkt_len < 1)) |
| 569 | pkt_len = 1; |
| 570 | qdisc_skb_cb(skb)->pkt_len = pkt_len; |
| 571 | } |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 572 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 573 | |
Florian Westphal | 6e765a0 | 2014-06-11 20:35:18 +0200 | [diff] [blame] | 574 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
Jarek Poplawski | b00355d | 2009-02-01 01:12:42 -0800 | [diff] [blame] | 575 | { |
| 576 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 577 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
| 578 | txt, qdisc->ops->id, qdisc->handle >> 16); |
Jarek Poplawski | b00355d | 2009-02-01 01:12:42 -0800 | [diff] [blame] | 579 | qdisc->flags |= TCQ_F_WARN_NONWC; |
| 580 | } |
| 581 | } |
| 582 | EXPORT_SYMBOL(qdisc_warn_nonwc); |
| 583 | |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 584 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
| 585 | { |
| 586 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, |
David S. Miller | 2fbd3da | 2009-09-01 17:59:25 -0700 | [diff] [blame] | 587 | timer); |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 588 | |
John Fastabend | 1e203c1 | 2014-10-02 22:43:09 -0700 | [diff] [blame] | 589 | rcu_read_lock(); |
David S. Miller | 8608db0 | 2008-08-18 20:51:18 -0700 | [diff] [blame] | 590 | __netif_schedule(qdisc_root(wd->qdisc)); |
John Fastabend | 1e203c1 | 2014-10-02 22:43:09 -0700 | [diff] [blame] | 591 | rcu_read_unlock(); |
Stephen Hemminger | 1936502 | 2007-03-22 12:18:35 -0700 | [diff] [blame] | 592 | |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 593 | return HRTIMER_NORESTART; |
| 594 | } |
| 595 | |
| 596 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) |
| 597 | { |
Eric Dumazet | 4a8e320 | 2014-09-20 18:01:30 -0700 | [diff] [blame] | 598 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
David S. Miller | 2fbd3da | 2009-09-01 17:59:25 -0700 | [diff] [blame] | 599 | wd->timer.function = qdisc_watchdog; |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 600 | wd->qdisc = qdisc; |
| 601 | } |
| 602 | EXPORT_SYMBOL(qdisc_watchdog_init); |
| 603 | |
Eric Dumazet | 45f50be | 2016-06-10 16:41:39 -0700 | [diff] [blame] | 604 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 605 | { |
Jarek Poplawski | 2540e05 | 2008-08-21 05:11:14 -0700 | [diff] [blame] | 606 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
| 607 | &qdisc_root_sleeping(wd->qdisc)->state)) |
| 608 | return; |
| 609 | |
Eric Dumazet | a9efad8 | 2016-05-23 14:24:56 -0700 | [diff] [blame] | 610 | if (wd->last_expires == expires) |
| 611 | return; |
| 612 | |
| 613 | wd->last_expires = expires; |
Eric Dumazet | 46baac3 | 2012-10-20 00:40:51 +0000 | [diff] [blame] | 614 | hrtimer_start(&wd->timer, |
Jiri Pirko | 34c5d29 | 2013-02-12 00:12:04 +0000 | [diff] [blame] | 615 | ns_to_ktime(expires), |
Eric Dumazet | 4a8e320 | 2014-09-20 18:01:30 -0700 | [diff] [blame] | 616 | HRTIMER_MODE_ABS_PINNED); |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 617 | } |
Jiri Pirko | 34c5d29 | 2013-02-12 00:12:04 +0000 | [diff] [blame] | 618 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 619 | |
| 620 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) |
| 621 | { |
David S. Miller | 2fbd3da | 2009-09-01 17:59:25 -0700 | [diff] [blame] | 622 | hrtimer_cancel(&wd->timer); |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 623 | } |
| 624 | EXPORT_SYMBOL(qdisc_watchdog_cancel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Adrian Bunk | a94f779 | 2008-07-22 14:20:11 -0700 | [diff] [blame] | 626 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
Patrick McHardy | 6fe1c7a | 2008-07-05 23:21:31 -0700 | [diff] [blame] | 627 | { |
| 628 | unsigned int size = n * sizeof(struct hlist_head), i; |
| 629 | struct hlist_head *h; |
| 630 | |
| 631 | if (size <= PAGE_SIZE) |
| 632 | h = kmalloc(size, GFP_KERNEL); |
| 633 | else |
| 634 | h = (struct hlist_head *) |
| 635 | __get_free_pages(GFP_KERNEL, get_order(size)); |
| 636 | |
| 637 | if (h != NULL) { |
| 638 | for (i = 0; i < n; i++) |
| 639 | INIT_HLIST_HEAD(&h[i]); |
| 640 | } |
| 641 | return h; |
| 642 | } |
| 643 | |
| 644 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) |
| 645 | { |
| 646 | unsigned int size = n * sizeof(struct hlist_head); |
| 647 | |
| 648 | if (size <= PAGE_SIZE) |
| 649 | kfree(h); |
| 650 | else |
| 651 | free_pages((unsigned long)h, get_order(size)); |
| 652 | } |
| 653 | |
| 654 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
| 655 | { |
| 656 | struct Qdisc_class_common *cl; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 657 | struct hlist_node *next; |
Patrick McHardy | 6fe1c7a | 2008-07-05 23:21:31 -0700 | [diff] [blame] | 658 | struct hlist_head *nhash, *ohash; |
| 659 | unsigned int nsize, nmask, osize; |
| 660 | unsigned int i, h; |
| 661 | |
| 662 | /* Rehash when load factor exceeds 0.75 */ |
| 663 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) |
| 664 | return; |
| 665 | nsize = clhash->hashsize * 2; |
| 666 | nmask = nsize - 1; |
| 667 | nhash = qdisc_class_hash_alloc(nsize); |
| 668 | if (nhash == NULL) |
| 669 | return; |
| 670 | |
| 671 | ohash = clhash->hash; |
| 672 | osize = clhash->hashsize; |
| 673 | |
| 674 | sch_tree_lock(sch); |
| 675 | for (i = 0; i < osize; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 676 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
Patrick McHardy | 6fe1c7a | 2008-07-05 23:21:31 -0700 | [diff] [blame] | 677 | h = qdisc_class_hash(cl->classid, nmask); |
| 678 | hlist_add_head(&cl->hnode, &nhash[h]); |
| 679 | } |
| 680 | } |
| 681 | clhash->hash = nhash; |
| 682 | clhash->hashsize = nsize; |
| 683 | clhash->hashmask = nmask; |
| 684 | sch_tree_unlock(sch); |
| 685 | |
| 686 | qdisc_class_hash_free(ohash, osize); |
| 687 | } |
| 688 | EXPORT_SYMBOL(qdisc_class_hash_grow); |
| 689 | |
| 690 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) |
| 691 | { |
| 692 | unsigned int size = 4; |
| 693 | |
| 694 | clhash->hash = qdisc_class_hash_alloc(size); |
| 695 | if (clhash->hash == NULL) |
| 696 | return -ENOMEM; |
| 697 | clhash->hashsize = size; |
| 698 | clhash->hashmask = size - 1; |
| 699 | clhash->hashelems = 0; |
| 700 | return 0; |
| 701 | } |
| 702 | EXPORT_SYMBOL(qdisc_class_hash_init); |
| 703 | |
| 704 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) |
| 705 | { |
| 706 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); |
| 707 | } |
| 708 | EXPORT_SYMBOL(qdisc_class_hash_destroy); |
| 709 | |
| 710 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, |
| 711 | struct Qdisc_class_common *cl) |
| 712 | { |
| 713 | unsigned int h; |
| 714 | |
| 715 | INIT_HLIST_NODE(&cl->hnode); |
| 716 | h = qdisc_class_hash(cl->classid, clhash->hashmask); |
| 717 | hlist_add_head(&cl->hnode, &clhash->hash[h]); |
| 718 | clhash->hashelems++; |
| 719 | } |
| 720 | EXPORT_SYMBOL(qdisc_class_hash_insert); |
| 721 | |
| 722 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, |
| 723 | struct Qdisc_class_common *cl) |
| 724 | { |
| 725 | hlist_del(&cl->hnode); |
| 726 | clhash->hashelems--; |
| 727 | } |
| 728 | EXPORT_SYMBOL(qdisc_class_hash_remove); |
| 729 | |
Eric Dumazet | fa0f5aa | 2012-01-03 00:00:11 +0000 | [diff] [blame] | 730 | /* Allocate an unique handle from space managed by kernel |
| 731 | * Possible range is [8000-FFFF]:0000 (0x8000 values) |
| 732 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | static u32 qdisc_alloc_handle(struct net_device *dev) |
| 734 | { |
Eric Dumazet | fa0f5aa | 2012-01-03 00:00:11 +0000 | [diff] [blame] | 735 | int i = 0x8000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
| 737 | |
| 738 | do { |
| 739 | autohandle += TC_H_MAKE(0x10000U, 0); |
| 740 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) |
| 741 | autohandle = TC_H_MAKE(0x80000000U, 0); |
Eric Dumazet | fa0f5aa | 2012-01-03 00:00:11 +0000 | [diff] [blame] | 742 | if (!qdisc_lookup(dev, autohandle)) |
| 743 | return autohandle; |
| 744 | cond_resched(); |
| 745 | } while (--i > 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Eric Dumazet | fa0f5aa | 2012-01-03 00:00:11 +0000 | [diff] [blame] | 747 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 750 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
| 751 | unsigned int len) |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 752 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 753 | const struct Qdisc_class_ops *cops; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 754 | unsigned long cl; |
| 755 | u32 parentid; |
Eric Dumazet | 2c8c8e6 | 2013-10-07 08:32:32 -0700 | [diff] [blame] | 756 | int drops; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 757 | |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 758 | if (n == 0 && len == 0) |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 759 | return; |
Eric Dumazet | 2c8c8e6 | 2013-10-07 08:32:32 -0700 | [diff] [blame] | 760 | drops = max_t(int, n, 0); |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 761 | rcu_read_lock(); |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 762 | while ((parentid = sch->parent)) { |
Jarek Poplawski | 066a3b5 | 2008-04-14 15:10:42 -0700 | [diff] [blame] | 763 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 764 | break; |
Jarek Poplawski | 066a3b5 | 2008-04-14 15:10:42 -0700 | [diff] [blame] | 765 | |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 766 | if (sch->flags & TCQ_F_NOPARENT) |
| 767 | break; |
| 768 | /* TODO: perform the search on a per txq basis */ |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 769 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 770 | if (sch == NULL) { |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 771 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
| 772 | break; |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 773 | } |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 774 | cops = sch->ops->cl_ops; |
| 775 | if (cops->qlen_notify) { |
| 776 | cl = cops->get(sch, parentid); |
| 777 | cops->qlen_notify(sch, cl); |
| 778 | cops->put(sch, cl); |
| 779 | } |
| 780 | sch->q.qlen -= n; |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 781 | sch->qstats.backlog -= len; |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 782 | __qdisc_qstats_drop(sch, drops); |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 783 | } |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 784 | rcu_read_unlock(); |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 785 | } |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 786 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 788 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
| 789 | struct nlmsghdr *n, u32 clid, |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 790 | struct Qdisc *old, struct Qdisc *new) |
| 791 | { |
| 792 | if (new || old) |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 793 | qdisc_notify(net, skb, n, clid, old, new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
David S. Miller | 4d8863a | 2008-08-18 21:03:15 -0700 | [diff] [blame] | 795 | if (old) |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 796 | qdisc_destroy(old); |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
| 800 | * to device "dev". |
| 801 | * |
| 802 | * When appropriate send a netlink notification using 'skb' |
| 803 | * and "n". |
| 804 | * |
| 805 | * On success, destroy old qdisc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | */ |
| 807 | |
| 808 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 809 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
| 810 | struct Qdisc *new, struct Qdisc *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 812 | struct Qdisc *q = old; |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 813 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 816 | if (parent == NULL) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 817 | unsigned int i, num_q, ingress; |
| 818 | |
| 819 | ingress = 0; |
| 820 | num_q = dev->num_tx_queues; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 821 | if ((q && q->flags & TCQ_F_INGRESS) || |
| 822 | (new && new->flags & TCQ_F_INGRESS)) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 823 | num_q = 1; |
| 824 | ingress = 1; |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 825 | if (!dev_ingress_queue(dev)) |
| 826 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 828 | |
| 829 | if (dev->flags & IFF_UP) |
| 830 | dev_deactivate(dev); |
| 831 | |
WANG Cong | 86e363d | 2015-05-26 16:08:48 -0700 | [diff] [blame] | 832 | if (new && new->ops->attach) |
| 833 | goto skip; |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 834 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 835 | for (i = 0; i < num_q; i++) { |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 836 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 837 | |
| 838 | if (!ingress) |
| 839 | dev_queue = netdev_get_tx_queue(dev, i); |
| 840 | |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 841 | old = dev_graft_qdisc(dev_queue, new); |
| 842 | if (new && i > 0) |
| 843 | atomic_inc(&new->refcnt); |
| 844 | |
Jarek Poplawski | 036d6a6 | 2009-09-13 22:35:44 +0000 | [diff] [blame] | 845 | if (!ingress) |
| 846 | qdisc_destroy(old); |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 847 | } |
| 848 | |
WANG Cong | 86e363d | 2015-05-26 16:08:48 -0700 | [diff] [blame] | 849 | skip: |
Jarek Poplawski | 036d6a6 | 2009-09-13 22:35:44 +0000 | [diff] [blame] | 850 | if (!ingress) { |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 851 | notify_and_destroy(net, skb, n, classid, |
| 852 | dev->qdisc, new); |
Jarek Poplawski | 036d6a6 | 2009-09-13 22:35:44 +0000 | [diff] [blame] | 853 | if (new && !new->ops->attach) |
| 854 | atomic_inc(&new->refcnt); |
| 855 | dev->qdisc = new ? : &noop_qdisc; |
WANG Cong | 86e363d | 2015-05-26 16:08:48 -0700 | [diff] [blame] | 856 | |
| 857 | if (new && new->ops->attach) |
| 858 | new->ops->attach(new); |
Jarek Poplawski | 036d6a6 | 2009-09-13 22:35:44 +0000 | [diff] [blame] | 859 | } else { |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 860 | notify_and_destroy(net, skb, n, classid, old, new); |
Jarek Poplawski | 036d6a6 | 2009-09-13 22:35:44 +0000 | [diff] [blame] | 861 | } |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 862 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 863 | if (dev->flags & IFF_UP) |
| 864 | dev_activate(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } else { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 866 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Patrick McHardy | c9f1d03 | 2009-09-04 06:41:13 +0000 | [diff] [blame] | 868 | err = -EOPNOTSUPP; |
| 869 | if (cops && cops->graft) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | unsigned long cl = cops->get(parent, classid); |
| 871 | if (cl) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 872 | err = cops->graft(parent, cl, new, &old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | cops->put(parent, cl); |
Patrick McHardy | c9f1d03 | 2009-09-04 06:41:13 +0000 | [diff] [blame] | 874 | } else |
| 875 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | } |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 877 | if (!err) |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 878 | notify_and_destroy(net, skb, n, classid, old, new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | } |
| 880 | return err; |
| 881 | } |
| 882 | |
Jarek Poplawski | 25bfcd5 | 2008-08-18 20:53:34 -0700 | [diff] [blame] | 883 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
| 884 | static struct lock_class_key qdisc_tx_lock; |
| 885 | static struct lock_class_key qdisc_rx_lock; |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* |
| 888 | Allocate and initialize new qdisc. |
| 889 | |
| 890 | Parameters are passed via opt. |
| 891 | */ |
| 892 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 893 | static struct Qdisc *qdisc_create(struct net_device *dev, |
| 894 | struct netdev_queue *dev_queue, |
| 895 | struct Qdisc *p, u32 parent, u32 handle, |
| 896 | struct nlattr **tca, int *errp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | { |
| 898 | int err; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 899 | struct nlattr *kind = tca[TCA_KIND]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | struct Qdisc *sch; |
| 901 | struct Qdisc_ops *ops; |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 902 | struct qdisc_size_table *stab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | ops = qdisc_lookup_ops(kind); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 905 | #ifdef CONFIG_MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | if (ops == NULL && kind != NULL) { |
| 907 | char name[IFNAMSIZ]; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 908 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | /* We dropped the RTNL semaphore in order to |
| 910 | * perform the module load. So, even if we |
| 911 | * succeeded in loading the module we have to |
| 912 | * tell the caller to replay the request. We |
| 913 | * indicate this using -EAGAIN. |
| 914 | * We replay the request because the device may |
| 915 | * go away in the mean time. |
| 916 | */ |
| 917 | rtnl_unlock(); |
| 918 | request_module("sch_%s", name); |
| 919 | rtnl_lock(); |
| 920 | ops = qdisc_lookup_ops(kind); |
| 921 | if (ops != NULL) { |
| 922 | /* We will try again qdisc_lookup_ops, |
| 923 | * so don't keep a reference. |
| 924 | */ |
| 925 | module_put(ops->owner); |
| 926 | err = -EAGAIN; |
| 927 | goto err_out; |
| 928 | } |
| 929 | } |
| 930 | } |
| 931 | #endif |
| 932 | |
Jamal Hadi Salim | b9e2cc0 | 2006-08-03 16:36:51 -0700 | [diff] [blame] | 933 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | if (ops == NULL) |
| 935 | goto err_out; |
| 936 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 937 | sch = qdisc_alloc(dev_queue, ops); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 938 | if (IS_ERR(sch)) { |
| 939 | err = PTR_ERR(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | goto err_out2; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 941 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 943 | sch->parent = parent; |
| 944 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 945 | if (handle == TC_H_INGRESS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | sch->flags |= TCQ_F_INGRESS; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 947 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
Jarek Poplawski | 25bfcd5 | 2008-08-18 20:53:34 -0700 | [diff] [blame] | 948 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
Patrick McHardy | fd44de7 | 2007-04-16 17:07:08 -0700 | [diff] [blame] | 949 | } else { |
Patrick McHardy | fd44de7 | 2007-04-16 17:07:08 -0700 | [diff] [blame] | 950 | if (handle == 0) { |
| 951 | handle = qdisc_alloc_handle(dev); |
| 952 | err = -ENOMEM; |
| 953 | if (handle == 0) |
| 954 | goto err_out3; |
| 955 | } |
Jarek Poplawski | 25bfcd5 | 2008-08-18 20:53:34 -0700 | [diff] [blame] | 956 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 957 | if (!netif_is_multiqueue(dev)) |
Eric Dumazet | 225734d | 2015-12-15 09:43:12 -0800 | [diff] [blame] | 958 | sch->flags |= TCQ_F_ONETXQUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 961 | sch->handle = handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Jesper Dangaard Brouer | 84c46dd | 2016-11-03 14:56:11 +0100 | [diff] [blame] | 963 | /* This exist to keep backward compatible with a userspace |
| 964 | * loophole, what allowed userspace to get IFF_NO_QUEUE |
| 965 | * facility on older kernels by setting tx_queue_len=0 (prior |
| 966 | * to qdisc init), and then forgot to reinit tx_queue_len |
| 967 | * before again attaching a qdisc. |
| 968 | */ |
| 969 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { |
| 970 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
| 971 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); |
| 972 | } |
| 973 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 974 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 975 | if (qdisc_is_percpu_stats(sch)) { |
| 976 | sch->cpu_bstats = |
Sabrina Dubroca | 7c1c97d | 2014-10-21 11:23:30 +0200 | [diff] [blame] | 977 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 978 | if (!sch->cpu_bstats) |
| 979 | goto err_out4; |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 980 | |
| 981 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
| 982 | if (!sch->cpu_qstats) |
| 983 | goto err_out4; |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 984 | } |
| 985 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 986 | if (tca[TCA_STAB]) { |
| 987 | stab = qdisc_get_stab(tca[TCA_STAB]); |
| 988 | if (IS_ERR(stab)) { |
| 989 | err = PTR_ERR(stab); |
Jarek Poplawski | 7c64b9f | 2009-09-15 23:42:05 -0700 | [diff] [blame] | 990 | goto err_out4; |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 991 | } |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 992 | rcu_assign_pointer(sch->stab, stab); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 993 | } |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 994 | if (tca[TCA_RATE]) { |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 995 | seqcount_t *running; |
Jarek Poplawski | f6f9b93 | 2008-08-27 02:25:17 -0700 | [diff] [blame] | 996 | |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 997 | err = -EOPNOTSUPP; |
| 998 | if (sch->flags & TCQ_F_MQROOT) |
| 999 | goto err_out4; |
| 1000 | |
Jarek Poplawski | f6f9b93 | 2008-08-27 02:25:17 -0700 | [diff] [blame] | 1001 | if ((sch->parent != TC_H_ROOT) && |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1002 | !(sch->flags & TCQ_F_INGRESS) && |
| 1003 | (!p || !(p->flags & TCQ_F_MQROOT))) |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1004 | running = qdisc_root_sleeping_running(sch); |
Jarek Poplawski | f6f9b93 | 2008-08-27 02:25:17 -0700 | [diff] [blame] | 1005 | else |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1006 | running = &sch->running; |
Jarek Poplawski | f6f9b93 | 2008-08-27 02:25:17 -0700 | [diff] [blame] | 1007 | |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1008 | err = gen_new_estimator(&sch->bstats, |
| 1009 | sch->cpu_bstats, |
| 1010 | &sch->rate_est, |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1011 | NULL, |
| 1012 | running, |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1013 | tca[TCA_RATE]); |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1014 | if (err) |
| 1015 | goto err_out4; |
Thomas Graf | 023e09a | 2005-07-05 14:15:53 -0700 | [diff] [blame] | 1016 | } |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 1017 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 1018 | qdisc_hash_add(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | return sch; |
| 1021 | } |
Eric Dumazet | 87b60cf | 2017-02-10 10:31:49 -0800 | [diff] [blame^] | 1022 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
| 1023 | ops->destroy(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | err_out3: |
| 1025 | dev_put(dev); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 1026 | kfree((char *) sch - sch->padded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | err_out2: |
| 1028 | module_put(ops->owner); |
| 1029 | err_out: |
| 1030 | *errp = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | return NULL; |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1032 | |
| 1033 | err_out4: |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1034 | free_percpu(sch->cpu_bstats); |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 1035 | free_percpu(sch->cpu_qstats); |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1036 | /* |
| 1037 | * Any broken qdiscs that would require a ops->reset() here? |
| 1038 | * The qdisc was never in action so it shouldn't be necessary. |
| 1039 | */ |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 1040 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1041 | if (ops->destroy) |
| 1042 | ops->destroy(sch); |
| 1043 | goto err_out3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | } |
| 1045 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1046 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | { |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 1048 | struct qdisc_size_table *ostab, *stab = NULL; |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1049 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1051 | if (tca[TCA_OPTIONS]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | if (sch->ops->change == NULL) |
| 1053 | return -EINVAL; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1054 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | if (err) |
| 1056 | return err; |
| 1057 | } |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1058 | |
| 1059 | if (tca[TCA_STAB]) { |
| 1060 | stab = qdisc_get_stab(tca[TCA_STAB]); |
| 1061 | if (IS_ERR(stab)) |
| 1062 | return PTR_ERR(stab); |
| 1063 | } |
| 1064 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 1065 | ostab = rtnl_dereference(sch->stab); |
| 1066 | rcu_assign_pointer(sch->stab, stab); |
| 1067 | qdisc_put_stab(ostab); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1068 | |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1069 | if (tca[TCA_RATE]) { |
Stephen Hemminger | 71bcb09 | 2008-11-25 21:13:31 -0800 | [diff] [blame] | 1070 | /* NB: ignores errors from replace_estimator |
| 1071 | because change can't be undone. */ |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1072 | if (sch->flags & TCQ_F_MQROOT) |
| 1073 | goto out; |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1074 | gen_replace_estimator(&sch->bstats, |
| 1075 | sch->cpu_bstats, |
| 1076 | &sch->rate_est, |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1077 | NULL, |
| 1078 | qdisc_root_sleeping_running(sch), |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1079 | tca[TCA_RATE]); |
Patrick McHardy | 23bcf63 | 2009-09-09 18:11:23 -0700 | [diff] [blame] | 1080 | } |
| 1081 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | return 0; |
| 1083 | } |
| 1084 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1085 | struct check_loop_arg { |
| 1086 | struct qdisc_walker w; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | struct Qdisc *p; |
| 1088 | int depth; |
| 1089 | }; |
| 1090 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1091 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
| 1092 | struct qdisc_walker *w); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | |
| 1094 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) |
| 1095 | { |
| 1096 | struct check_loop_arg arg; |
| 1097 | |
| 1098 | if (q->ops->cl_ops == NULL) |
| 1099 | return 0; |
| 1100 | |
| 1101 | arg.w.stop = arg.w.skip = arg.w.count = 0; |
| 1102 | arg.w.fn = check_loop_fn; |
| 1103 | arg.depth = depth; |
| 1104 | arg.p = p; |
| 1105 | q->ops->cl_ops->walk(q, &arg.w); |
| 1106 | return arg.w.stop ? -ELOOP : 0; |
| 1107 | } |
| 1108 | |
| 1109 | static int |
| 1110 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) |
| 1111 | { |
| 1112 | struct Qdisc *leaf; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1113 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
| 1115 | |
| 1116 | leaf = cops->leaf(q, cl); |
| 1117 | if (leaf) { |
| 1118 | if (leaf == arg->p || arg->depth > 7) |
| 1119 | return -ELOOP; |
| 1120 | return check_loop(leaf, arg->p, arg->depth + 1); |
| 1121 | } |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Delete/get qdisc. |
| 1127 | */ |
| 1128 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1129 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1131 | struct net *net = sock_net(skb->sk); |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1132 | struct tcmsg *tcm = nlmsg_data(n); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1133 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | struct net_device *dev; |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1135 | u32 clid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | struct Qdisc *q = NULL; |
| 1137 | struct Qdisc *p = NULL; |
| 1138 | int err; |
| 1139 | |
Stéphane Graber | 4e8bbb8 | 2014-04-30 11:25:43 -0400 | [diff] [blame] | 1140 | if ((n->nlmsg_type != RTM_GETQDISC) && |
David S. Miller | 5f013c9b | 2014-05-12 13:19:14 -0400 | [diff] [blame] | 1141 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
Eric W. Biederman | dfc47ef | 2012-11-16 03:03:00 +0000 | [diff] [blame] | 1142 | return -EPERM; |
| 1143 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1144 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 1145 | if (err < 0) |
| 1146 | return err; |
| 1147 | |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1148 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
| 1149 | if (!dev) |
| 1150 | return -ENODEV; |
| 1151 | |
| 1152 | clid = tcm->tcm_parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | if (clid) { |
| 1154 | if (clid != TC_H_ROOT) { |
| 1155 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1156 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
| 1157 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | return -ENOENT; |
| 1159 | q = qdisc_leaf(p, clid); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1160 | } else if (dev_ingress_queue(dev)) { |
| 1161 | q = dev_ingress_queue(dev)->qdisc_sleeping; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | } else { |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 1164 | q = dev->qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | if (!q) |
| 1167 | return -ENOENT; |
| 1168 | |
| 1169 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) |
| 1170 | return -EINVAL; |
| 1171 | } else { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1172 | q = qdisc_lookup(dev, tcm->tcm_handle); |
| 1173 | if (!q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | return -ENOENT; |
| 1175 | } |
| 1176 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1177 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | return -EINVAL; |
| 1179 | |
| 1180 | if (n->nlmsg_type == RTM_DELQDISC) { |
| 1181 | if (!clid) |
| 1182 | return -EINVAL; |
| 1183 | if (q->handle == 0) |
| 1184 | return -ENOENT; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1185 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
| 1186 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } else { |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1189 | qdisc_notify(net, skb, n, clid, NULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | } |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | /* |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1195 | * Create/change qdisc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | */ |
| 1197 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1198 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1200 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | struct tcmsg *tcm; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1202 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | struct net_device *dev; |
| 1204 | u32 clid; |
| 1205 | struct Qdisc *q, *p; |
| 1206 | int err; |
| 1207 | |
David S. Miller | 5f013c9b | 2014-05-12 13:19:14 -0400 | [diff] [blame] | 1208 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
Eric W. Biederman | dfc47ef | 2012-11-16 03:03:00 +0000 | [diff] [blame] | 1209 | return -EPERM; |
| 1210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | replay: |
| 1212 | /* Reinit, just in case something touches this. */ |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1213 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 1214 | if (err < 0) |
| 1215 | return err; |
| 1216 | |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1217 | tcm = nlmsg_data(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | clid = tcm->tcm_parent; |
| 1219 | q = p = NULL; |
| 1220 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1221 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
| 1222 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | return -ENODEV; |
| 1224 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | if (clid) { |
| 1227 | if (clid != TC_H_ROOT) { |
| 1228 | if (clid != TC_H_INGRESS) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1229 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
| 1230 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | return -ENOENT; |
| 1232 | q = qdisc_leaf(p, clid); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1233 | } else if (dev_ingress_queue_create(dev)) { |
| 1234 | q = dev_ingress_queue(dev)->qdisc_sleeping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | } |
| 1236 | } else { |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 1237 | q = dev->qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | } |
| 1239 | |
| 1240 | /* It may be default qdisc, ignore it */ |
| 1241 | if (q && q->handle == 0) |
| 1242 | q = NULL; |
| 1243 | |
| 1244 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { |
| 1245 | if (tcm->tcm_handle) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1246 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | return -EEXIST; |
| 1248 | if (TC_H_MIN(tcm->tcm_handle)) |
| 1249 | return -EINVAL; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1250 | q = qdisc_lookup(dev, tcm->tcm_handle); |
| 1251 | if (!q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | goto create_n_graft; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1253 | if (n->nlmsg_flags & NLM_F_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return -EEXIST; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1255 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | return -EINVAL; |
| 1257 | if (q == p || |
| 1258 | (p && check_loop(q, p, 0))) |
| 1259 | return -ELOOP; |
| 1260 | atomic_inc(&q->refcnt); |
| 1261 | goto graft; |
| 1262 | } else { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1263 | if (!q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | goto create_n_graft; |
| 1265 | |
| 1266 | /* This magic test requires explanation. |
| 1267 | * |
| 1268 | * We know, that some child q is already |
| 1269 | * attached to this parent and have choice: |
| 1270 | * either to change it or to create/graft new one. |
| 1271 | * |
| 1272 | * 1. We are allowed to create/graft only |
| 1273 | * if CREATE and REPLACE flags are set. |
| 1274 | * |
| 1275 | * 2. If EXCL is set, requestor wanted to say, |
| 1276 | * that qdisc tcm_handle is not expected |
| 1277 | * to exist, so that we choose create/graft too. |
| 1278 | * |
| 1279 | * 3. The last case is when no flags are set. |
| 1280 | * Alas, it is sort of hole in API, we |
| 1281 | * cannot decide what to do unambiguously. |
| 1282 | * For now we select create/graft, if |
| 1283 | * user gave KIND, which does not match existing. |
| 1284 | */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1285 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
| 1286 | (n->nlmsg_flags & NLM_F_REPLACE) && |
| 1287 | ((n->nlmsg_flags & NLM_F_EXCL) || |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1288 | (tca[TCA_KIND] && |
| 1289 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | goto create_n_graft; |
| 1291 | } |
| 1292 | } |
| 1293 | } else { |
| 1294 | if (!tcm->tcm_handle) |
| 1295 | return -EINVAL; |
| 1296 | q = qdisc_lookup(dev, tcm->tcm_handle); |
| 1297 | } |
| 1298 | |
| 1299 | /* Change qdisc parameters */ |
| 1300 | if (q == NULL) |
| 1301 | return -ENOENT; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1302 | if (n->nlmsg_flags & NLM_F_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | return -EEXIST; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1304 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | return -EINVAL; |
| 1306 | err = qdisc_change(q, tca); |
| 1307 | if (err == 0) |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1308 | qdisc_notify(net, skb, n, clid, NULL, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | return err; |
| 1310 | |
| 1311 | create_n_graft: |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1312 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | return -ENOENT; |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 1314 | if (clid == TC_H_INGRESS) { |
| 1315 | if (dev_ingress_queue(dev)) |
| 1316 | q = qdisc_create(dev, dev_ingress_queue(dev), p, |
| 1317 | tcm->tcm_parent, tcm->tcm_parent, |
| 1318 | tca, &err); |
| 1319 | else |
| 1320 | err = -ENOENT; |
| 1321 | } else { |
Jarek Poplawski | 926e61b | 2009-09-15 02:53:07 -0700 | [diff] [blame] | 1322 | struct netdev_queue *dev_queue; |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 1323 | |
| 1324 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) |
Jarek Poplawski | 926e61b | 2009-09-15 02:53:07 -0700 | [diff] [blame] | 1325 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
| 1326 | else if (p) |
| 1327 | dev_queue = p->dev_queue; |
| 1328 | else |
| 1329 | dev_queue = netdev_get_tx_queue(dev, 0); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 1330 | |
Jarek Poplawski | 926e61b | 2009-09-15 02:53:07 -0700 | [diff] [blame] | 1331 | q = qdisc_create(dev, dev_queue, p, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1332 | tcm->tcm_parent, tcm->tcm_handle, |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 1333 | tca, &err); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 1334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | if (q == NULL) { |
| 1336 | if (err == -EAGAIN) |
| 1337 | goto replay; |
| 1338 | return err; |
| 1339 | } |
| 1340 | |
| 1341 | graft: |
Ilpo Järvinen | e5befbd | 2008-08-18 22:30:01 -0700 | [diff] [blame] | 1342 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
| 1343 | if (err) { |
| 1344 | if (q) |
| 1345 | qdisc_destroy(q); |
| 1346 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | } |
Ilpo Järvinen | e5befbd | 2008-08-18 22:30:01 -0700 | [diff] [blame] | 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | return 0; |
| 1350 | } |
| 1351 | |
| 1352 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1353 | u32 portid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | { |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1355 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 1356 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | struct tcmsg *tcm; |
| 1358 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1359 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | struct gnet_dump d; |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 1361 | struct qdisc_size_table *stab; |
John Fastabend | 6401585 | 2014-09-28 11:53:57 -0700 | [diff] [blame] | 1362 | __u32 qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Eric Dumazet | fba373d | 2014-03-10 17:11:43 -0700 | [diff] [blame] | 1364 | cond_resched(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1365 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1366 | if (!nlh) |
| 1367 | goto out_nlmsg_trim; |
| 1368 | tcm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | tcm->tcm_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1370 | tcm->tcm__pad1 = 0; |
| 1371 | tcm->tcm__pad2 = 0; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 1372 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | tcm->tcm_parent = clid; |
| 1374 | tcm->tcm_handle = q->handle; |
| 1375 | tcm->tcm_info = atomic_read(&q->refcnt); |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 1376 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
| 1377 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1379 | goto nla_put_failure; |
John Fastabend | 6401585 | 2014-09-28 11:53:57 -0700 | [diff] [blame] | 1380 | qlen = q->q.qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 1382 | stab = rtnl_dereference(q->stab); |
| 1383 | if (stab && qdisc_dump_stab(skb, stab) < 0) |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1384 | goto nla_put_failure; |
| 1385 | |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 1386 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1387 | NULL, &d, TCA_PAD) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1388 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
| 1390 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1391 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 1393 | if (qdisc_is_percpu_stats(q)) { |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1394 | cpu_bstats = q->cpu_bstats; |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 1395 | cpu_qstats = q->cpu_qstats; |
| 1396 | } |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 1397 | |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1398 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), |
| 1399 | &d, cpu_bstats, &q->bstats) < 0 || |
Eric Dumazet | 1c0d32f | 2016-12-04 09:48:16 -0800 | [diff] [blame] | 1400 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
John Fastabend | b0ab6f9 | 2014-09-28 11:54:24 -0700 | [diff] [blame] | 1401 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1402 | goto nla_put_failure; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | if (gnet_stats_finish_copy(&d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1405 | goto nla_put_failure; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1406 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1407 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | return skb->len; |
| 1409 | |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1410 | out_nlmsg_trim: |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1411 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1412 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | return -1; |
| 1414 | } |
| 1415 | |
Eric Dumazet | 53b0f08 | 2010-05-22 20:37:44 +0000 | [diff] [blame] | 1416 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
| 1417 | { |
| 1418 | return (q->flags & TCQ_F_BUILTIN) ? true : false; |
| 1419 | } |
| 1420 | |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1421 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
| 1422 | struct nlmsghdr *n, u32 clid, |
| 1423 | struct Qdisc *old, struct Qdisc *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | { |
| 1425 | struct sk_buff *skb; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1426 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1429 | if (!skb) |
| 1430 | return -ENOBUFS; |
| 1431 | |
Eric Dumazet | 53b0f08 | 2010-05-22 20:37:44 +0000 | [diff] [blame] | 1432 | if (old && !tc_qdisc_dump_ignore(old)) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1433 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1434 | 0, RTM_DELQDISC) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | goto err_out; |
| 1436 | } |
Eric Dumazet | 53b0f08 | 2010-05-22 20:37:44 +0000 | [diff] [blame] | 1437 | if (new && !tc_qdisc_dump_ignore(new)) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1438 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1439 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | goto err_out; |
| 1441 | } |
| 1442 | |
| 1443 | if (skb->len) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1444 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1445 | n->nlmsg_flags & NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | |
| 1447 | err_out: |
| 1448 | kfree_skb(skb); |
| 1449 | return -EINVAL; |
| 1450 | } |
| 1451 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1452 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
| 1453 | struct netlink_callback *cb, |
Jiri Kosina | ea32746 | 2016-08-16 23:53:46 +0200 | [diff] [blame] | 1454 | int *q_idx_p, int s_q_idx, bool recur) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1455 | { |
| 1456 | int ret = 0, q_idx = *q_idx_p; |
| 1457 | struct Qdisc *q; |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 1458 | int b; |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1459 | |
| 1460 | if (!root) |
| 1461 | return 0; |
| 1462 | |
| 1463 | q = root; |
| 1464 | if (q_idx < s_q_idx) { |
| 1465 | q_idx++; |
| 1466 | } else { |
| 1467 | if (!tc_qdisc_dump_ignore(q) && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1468 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1469 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 1470 | RTM_NEWQDISC) <= 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1471 | goto done; |
| 1472 | q_idx++; |
| 1473 | } |
Jiri Kosina | 69012ae | 2016-08-16 23:52:58 +0200 | [diff] [blame] | 1474 | |
Jiri Kosina | ea32746 | 2016-08-16 23:53:46 +0200 | [diff] [blame] | 1475 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
| 1476 | * itself has already been dumped. |
| 1477 | * |
| 1478 | * If we've already dumped the top-level (ingress) qdisc above and the global |
| 1479 | * qdisc hashtable, we don't want to hit it again |
| 1480 | */ |
| 1481 | if (!qdisc_dev(root) || !recur) |
Jiri Kosina | 69012ae | 2016-08-16 23:52:58 +0200 | [diff] [blame] | 1482 | goto out; |
| 1483 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 1484 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1485 | if (q_idx < s_q_idx) { |
| 1486 | q_idx++; |
| 1487 | continue; |
| 1488 | } |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1489 | if (!tc_qdisc_dump_ignore(q) && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1490 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1491 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 1492 | RTM_NEWQDISC) <= 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1493 | goto done; |
| 1494 | q_idx++; |
| 1495 | } |
| 1496 | |
| 1497 | out: |
| 1498 | *q_idx_p = q_idx; |
| 1499 | return ret; |
| 1500 | done: |
| 1501 | ret = -1; |
| 1502 | goto out; |
| 1503 | } |
| 1504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
| 1506 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1507 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | int idx, q_idx; |
| 1509 | int s_idx, s_q_idx; |
| 1510 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
| 1512 | s_idx = cb->args[0]; |
| 1513 | s_q_idx = q_idx = cb->args[1]; |
stephen hemminger | f1e9016 | 2009-11-10 07:54:49 +0000 | [diff] [blame] | 1514 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1515 | idx = 0; |
Eric Dumazet | 15dc36e | 2014-03-10 17:11:42 -0700 | [diff] [blame] | 1516 | ASSERT_RTNL(); |
| 1517 | for_each_netdev(net, dev) { |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1518 | struct netdev_queue *dev_queue; |
| 1519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | if (idx < s_idx) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1521 | goto cont; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | if (idx > s_idx) |
| 1523 | s_q_idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | q_idx = 0; |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1525 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1526 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
| 1527 | true) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1528 | goto done; |
| 1529 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 1530 | dev_queue = dev_ingress_queue(dev); |
| 1531 | if (dev_queue && |
| 1532 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, |
Jiri Kosina | ea32746 | 2016-08-16 23:53:46 +0200 | [diff] [blame] | 1533 | &q_idx, s_q_idx, false) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1534 | goto done; |
| 1535 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1536 | cont: |
| 1537 | idx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
| 1540 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | cb->args[0] = idx; |
| 1542 | cb->args[1] = q_idx; |
| 1543 | |
| 1544 | return skb->len; |
| 1545 | } |
| 1546 | |
| 1547 | |
| 1548 | |
| 1549 | /************************************************ |
| 1550 | * Traffic classes manipulation. * |
| 1551 | ************************************************/ |
| 1552 | |
| 1553 | |
| 1554 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1555 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1557 | struct net *net = sock_net(skb->sk); |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1558 | struct tcmsg *tcm = nlmsg_data(n); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1559 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | struct net_device *dev; |
| 1561 | struct Qdisc *q = NULL; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1562 | const struct Qdisc_class_ops *cops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | unsigned long cl = 0; |
| 1564 | unsigned long new_cl; |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1565 | u32 portid; |
| 1566 | u32 clid; |
| 1567 | u32 qid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | int err; |
| 1569 | |
Stéphane Graber | 4e8bbb8 | 2014-04-30 11:25:43 -0400 | [diff] [blame] | 1570 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
David S. Miller | 5f013c9b | 2014-05-12 13:19:14 -0400 | [diff] [blame] | 1571 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
Eric W. Biederman | dfc47ef | 2012-11-16 03:03:00 +0000 | [diff] [blame] | 1572 | return -EPERM; |
| 1573 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1574 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 1575 | if (err < 0) |
| 1576 | return err; |
| 1577 | |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1578 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
| 1579 | if (!dev) |
| 1580 | return -ENODEV; |
| 1581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | /* |
| 1583 | parent == TC_H_UNSPEC - unspecified parent. |
| 1584 | parent == TC_H_ROOT - class is root, which has no parent. |
| 1585 | parent == X:0 - parent is root class. |
| 1586 | parent == X:Y - parent is a node in hierarchy. |
| 1587 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. |
| 1588 | |
| 1589 | handle == 0:0 - generate handle from kernel pool. |
| 1590 | handle == 0:Y - class is X:Y, where X:0 is qdisc. |
| 1591 | handle == X:Y - clear. |
| 1592 | handle == X:0 - root class. |
| 1593 | */ |
| 1594 | |
| 1595 | /* Step 1. Determine qdisc handle X:0 */ |
| 1596 | |
Hong zhi guo | de179c8 | 2013-03-25 17:36:33 +0000 | [diff] [blame] | 1597 | portid = tcm->tcm_parent; |
| 1598 | clid = tcm->tcm_handle; |
| 1599 | qid = TC_H_MAJ(clid); |
| 1600 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1601 | if (portid != TC_H_ROOT) { |
| 1602 | u32 qid1 = TC_H_MAJ(portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | |
| 1604 | if (qid && qid1) { |
| 1605 | /* If both majors are known, they must be identical. */ |
| 1606 | if (qid != qid1) |
| 1607 | return -EINVAL; |
| 1608 | } else if (qid1) { |
| 1609 | qid = qid1; |
| 1610 | } else if (qid == 0) |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 1611 | qid = dev->qdisc->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | |
| 1613 | /* Now qid is genuine qdisc handle consistent |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1614 | * both with parent and child. |
| 1615 | * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1616 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1618 | if (portid) |
| 1619 | portid = TC_H_MAKE(qid, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | } else { |
| 1621 | if (qid == 0) |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 1622 | qid = dev->qdisc->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | } |
| 1624 | |
| 1625 | /* OK. Locate qdisc */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1626 | q = qdisc_lookup(dev, qid); |
| 1627 | if (!q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | return -ENOENT; |
| 1629 | |
| 1630 | /* An check that it supports classes */ |
| 1631 | cops = q->ops->cl_ops; |
| 1632 | if (cops == NULL) |
| 1633 | return -EINVAL; |
| 1634 | |
| 1635 | /* Now try to get class */ |
| 1636 | if (clid == 0) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1637 | if (portid == TC_H_ROOT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | clid = qid; |
| 1639 | } else |
| 1640 | clid = TC_H_MAKE(qid, clid); |
| 1641 | |
| 1642 | if (clid) |
| 1643 | cl = cops->get(q, clid); |
| 1644 | |
| 1645 | if (cl == 0) { |
| 1646 | err = -ENOENT; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1647 | if (n->nlmsg_type != RTM_NEWTCLASS || |
| 1648 | !(n->nlmsg_flags & NLM_F_CREATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | goto out; |
| 1650 | } else { |
| 1651 | switch (n->nlmsg_type) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1652 | case RTM_NEWTCLASS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | err = -EEXIST; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1654 | if (n->nlmsg_flags & NLM_F_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | goto out; |
| 1656 | break; |
| 1657 | case RTM_DELTCLASS: |
Patrick McHardy | de6d5cd | 2009-09-04 06:41:16 +0000 | [diff] [blame] | 1658 | err = -EOPNOTSUPP; |
| 1659 | if (cops->delete) |
| 1660 | err = cops->delete(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | if (err == 0) |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1662 | tclass_notify(net, skb, n, q, cl, |
| 1663 | RTM_DELTCLASS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | goto out; |
| 1665 | case RTM_GETTCLASS: |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1666 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | goto out; |
| 1668 | default: |
| 1669 | err = -EINVAL; |
| 1670 | goto out; |
| 1671 | } |
| 1672 | } |
| 1673 | |
| 1674 | new_cl = cl; |
Patrick McHardy | de6d5cd | 2009-09-04 06:41:16 +0000 | [diff] [blame] | 1675 | err = -EOPNOTSUPP; |
| 1676 | if (cops->change) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1677 | err = cops->change(q, clid, portid, tca, &new_cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | if (err == 0) |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1679 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
| 1681 | out: |
| 1682 | if (cl) |
| 1683 | cops->put(q, cl); |
| 1684 | |
| 1685 | return err; |
| 1686 | } |
| 1687 | |
| 1688 | |
| 1689 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
| 1690 | unsigned long cl, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1691 | u32 portid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | { |
| 1693 | struct tcmsg *tcm; |
| 1694 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1695 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | struct gnet_dump d; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1697 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
Eric Dumazet | fba373d | 2014-03-10 17:11:43 -0700 | [diff] [blame] | 1699 | cond_resched(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1700 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1701 | if (!nlh) |
| 1702 | goto out_nlmsg_trim; |
| 1703 | tcm = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | tcm->tcm_family = AF_UNSPEC; |
Eric Dumazet | 16ebb5e | 2009-09-02 02:40:09 +0000 | [diff] [blame] | 1705 | tcm->tcm__pad1 = 0; |
| 1706 | tcm->tcm__pad2 = 0; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 1707 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | tcm->tcm_parent = q->handle; |
| 1709 | tcm->tcm_handle = q->handle; |
| 1710 | tcm->tcm_info = 0; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 1711 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
| 1712 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1714 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 1716 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
Eric Dumazet | edb09eb | 2016-06-06 09:37:16 -0700 | [diff] [blame] | 1717 | NULL, &d, TCA_PAD) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1718 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | |
| 1720 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1721 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
| 1723 | if (gnet_stats_finish_copy(&d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1724 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1726 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | return skb->len; |
| 1728 | |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1729 | out_nlmsg_trim: |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1730 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1731 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | return -1; |
| 1733 | } |
| 1734 | |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1735 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
| 1736 | struct nlmsghdr *n, struct Qdisc *q, |
| 1737 | unsigned long cl, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | { |
| 1739 | struct sk_buff *skb; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1740 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | |
| 1742 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1743 | if (!skb) |
| 1744 | return -ENOBUFS; |
| 1745 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1746 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | kfree_skb(skb); |
| 1748 | return -EINVAL; |
| 1749 | } |
| 1750 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1751 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1752 | n->nlmsg_flags & NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | } |
| 1754 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1755 | struct qdisc_dump_args { |
| 1756 | struct qdisc_walker w; |
| 1757 | struct sk_buff *skb; |
| 1758 | struct netlink_callback *cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | }; |
| 1760 | |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1761 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
| 1762 | struct qdisc_walker *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | { |
| 1764 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; |
| 1765 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1766 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1767 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 1768 | RTM_NEWTCLASS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | } |
| 1770 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1771 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
| 1772 | struct tcmsg *tcm, struct netlink_callback *cb, |
| 1773 | int *t_p, int s_t) |
| 1774 | { |
| 1775 | struct qdisc_dump_args arg; |
| 1776 | |
| 1777 | if (tc_qdisc_dump_ignore(q) || |
| 1778 | *t_p < s_t || !q->ops->cl_ops || |
| 1779 | (tcm->tcm_parent && |
| 1780 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { |
| 1781 | (*t_p)++; |
| 1782 | return 0; |
| 1783 | } |
| 1784 | if (*t_p > s_t) |
| 1785 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 1786 | arg.w.fn = qdisc_class_dump; |
| 1787 | arg.skb = skb; |
| 1788 | arg.cb = cb; |
| 1789 | arg.w.stop = 0; |
| 1790 | arg.w.skip = cb->args[1]; |
| 1791 | arg.w.count = 0; |
| 1792 | q->ops->cl_ops->walk(q, &arg.w); |
| 1793 | cb->args[1] = arg.w.count; |
| 1794 | if (arg.w.stop) |
| 1795 | return -1; |
| 1796 | (*t_p)++; |
| 1797 | return 0; |
| 1798 | } |
| 1799 | |
| 1800 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, |
| 1801 | struct tcmsg *tcm, struct netlink_callback *cb, |
| 1802 | int *t_p, int s_t) |
| 1803 | { |
| 1804 | struct Qdisc *q; |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 1805 | int b; |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1806 | |
| 1807 | if (!root) |
| 1808 | return 0; |
| 1809 | |
| 1810 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) |
| 1811 | return -1; |
| 1812 | |
Jiri Kosina | 69012ae | 2016-08-16 23:52:58 +0200 | [diff] [blame] | 1813 | if (!qdisc_dev(root)) |
| 1814 | return 0; |
| 1815 | |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 1816 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1817 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
| 1818 | return -1; |
| 1819 | } |
| 1820 | |
| 1821 | return 0; |
| 1822 | } |
| 1823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
| 1825 | { |
David S. Miller | 02ef22c | 2012-06-26 21:50:05 -0700 | [diff] [blame] | 1826 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1827 | struct net *net = sock_net(skb->sk); |
| 1828 | struct netdev_queue *dev_queue; |
| 1829 | struct net_device *dev; |
| 1830 | int t, s_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1832 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | return 0; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1834 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
| 1835 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | return 0; |
| 1837 | |
| 1838 | s_t = cb->args[0]; |
| 1839 | t = 0; |
| 1840 | |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 1841 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1842 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 1844 | dev_queue = dev_ingress_queue(dev); |
| 1845 | if (dev_queue && |
| 1846 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, |
| 1847 | &t, s_t) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1848 | goto done; |
| 1849 | |
| 1850 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | cb->args[0] = t; |
| 1852 | |
| 1853 | dev_put(dev); |
| 1854 | return skb->len; |
| 1855 | } |
| 1856 | |
| 1857 | /* Main classifier routine: scans classifier chain attached |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1858 | * to this qdisc, (optionally) tests for protocol and asks |
| 1859 | * specific classifiers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | */ |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1861 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
| 1862 | struct tcf_result *res, bool compat_mode) |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1863 | { |
Jiri Pirko | d8b9605 | 2015-01-13 17:13:43 +0100 | [diff] [blame] | 1864 | __be16 protocol = tc_skb_protocol(skb); |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1865 | #ifdef CONFIG_NET_CLS_ACT |
Willem de Bruijn | d626407 | 2017-01-07 17:06:34 -0500 | [diff] [blame] | 1866 | const int max_reclassify_loop = 4; |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1867 | const struct tcf_proto *old_tp = tp; |
| 1868 | int limit = 0; |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1869 | |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1870 | reclassify: |
| 1871 | #endif |
John Fastabend | 25d8c0d | 2014-09-12 20:05:27 -0700 | [diff] [blame] | 1872 | for (; tp; tp = rcu_dereference_bh(tp->next)) { |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1873 | int err; |
| 1874 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1875 | if (tp->protocol != protocol && |
| 1876 | tp->protocol != htons(ETH_P_ALL)) |
| 1877 | continue; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1878 | |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1879 | err = tp->classify(skb, tp, res); |
| 1880 | #ifdef CONFIG_NET_CLS_ACT |
Daniel Borkmann | c1b3b19 | 2015-08-28 18:46:39 +0200 | [diff] [blame] | 1881 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1882 | goto reset; |
| 1883 | #endif |
Florian Westphal | e578d9c | 2015-05-11 19:50:41 +0200 | [diff] [blame] | 1884 | if (err >= 0) |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1885 | return err; |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1886 | } |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1887 | |
Jamal Hadi Salim | 7e6e18f | 2016-02-18 08:04:43 -0500 | [diff] [blame] | 1888 | return TC_ACT_UNSPEC; /* signal: continue lookup */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | #ifdef CONFIG_NET_CLS_ACT |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1890 | reset: |
Willem de Bruijn | d626407 | 2017-01-07 17:06:34 -0500 | [diff] [blame] | 1891 | if (unlikely(limit++ >= max_reclassify_loop)) { |
Daniel Borkmann | c1b3b19 | 2015-08-28 18:46:39 +0200 | [diff] [blame] | 1892 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
| 1893 | tp->q->ops->id, tp->prio & 0xffff, |
| 1894 | ntohs(tp->protocol)); |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1895 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | } |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1897 | |
| 1898 | tp = old_tp; |
Jamal Hadi Salim | 619fe32 | 2016-02-18 07:38:04 -0500 | [diff] [blame] | 1899 | protocol = tc_skb_protocol(skb); |
Daniel Borkmann | 3b3ae88 | 2015-08-26 23:00:06 +0200 | [diff] [blame] | 1900 | goto reclassify; |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1901 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | } |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1903 | EXPORT_SYMBOL(tc_classify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | #ifdef CONFIG_PROC_FS |
| 1906 | static int psched_show(struct seq_file *seq, void *v) |
| 1907 | { |
| 1908 | seq_printf(seq, "%08x %08x %08x %08x\n", |
Jarek Poplawski | ca44d6e | 2009-06-15 02:31:47 -0700 | [diff] [blame] | 1909 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
Patrick McHardy | 514bca3 | 2007-03-16 12:34:52 -0700 | [diff] [blame] | 1910 | 1000000, |
Thomas Gleixner | 1e31768 | 2015-04-14 21:08:28 +0000 | [diff] [blame] | 1911 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | return 0; |
| 1914 | } |
| 1915 | |
| 1916 | static int psched_open(struct inode *inode, struct file *file) |
| 1917 | { |
Tom Goff | 7e5ab15 | 2010-03-30 19:44:56 -0700 | [diff] [blame] | 1918 | return single_open(file, psched_show, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | } |
| 1920 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 1921 | static const struct file_operations psched_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | .owner = THIS_MODULE, |
| 1923 | .open = psched_open, |
| 1924 | .read = seq_read, |
| 1925 | .llseek = seq_lseek, |
| 1926 | .release = single_release, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1927 | }; |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1928 | |
| 1929 | static int __net_init psched_net_init(struct net *net) |
| 1930 | { |
| 1931 | struct proc_dir_entry *e; |
| 1932 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 1933 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1934 | if (e == NULL) |
| 1935 | return -ENOMEM; |
| 1936 | |
| 1937 | return 0; |
| 1938 | } |
| 1939 | |
| 1940 | static void __net_exit psched_net_exit(struct net *net) |
| 1941 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 1942 | remove_proc_entry("psched", net->proc_net); |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1943 | } |
| 1944 | #else |
| 1945 | static int __net_init psched_net_init(struct net *net) |
| 1946 | { |
| 1947 | return 0; |
| 1948 | } |
| 1949 | |
| 1950 | static void __net_exit psched_net_exit(struct net *net) |
| 1951 | { |
| 1952 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | #endif |
| 1954 | |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1955 | static struct pernet_operations psched_net_ops = { |
| 1956 | .init = psched_net_init, |
| 1957 | .exit = psched_net_exit, |
| 1958 | }; |
| 1959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | static int __init pktsched_init(void) |
| 1961 | { |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1962 | int err; |
| 1963 | |
| 1964 | err = register_pernet_subsys(&psched_net_ops); |
| 1965 | if (err) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1966 | pr_err("pktsched_init: " |
Tom Goff | 7316ae8 | 2010-03-19 15:40:13 +0000 | [diff] [blame] | 1967 | "cannot initialize per netns operations\n"); |
| 1968 | return err; |
| 1969 | } |
| 1970 | |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 1971 | register_qdisc(&pfifo_fast_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | register_qdisc(&pfifo_qdisc_ops); |
| 1973 | register_qdisc(&bfifo_qdisc_ops); |
Hagen Paul Pfeifer | 57dbb2d | 2010-01-24 12:30:59 +0000 | [diff] [blame] | 1974 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 1975 | register_qdisc(&mq_qdisc_ops); |
Phil Sutter | d66d6c3 | 2015-08-27 21:21:38 +0200 | [diff] [blame] | 1976 | register_qdisc(&noqueue_qdisc_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1978 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
| 1979 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1980 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
| 1981 | NULL); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1982 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); |
| 1983 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 1984 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
| 1985 | NULL); |
Thomas Graf | be577dd | 2007-03-22 11:55:50 -0700 | [diff] [blame] | 1986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | return 0; |
| 1988 | } |
| 1989 | |
| 1990 | subsys_initcall(pktsched_init); |