Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/cls_api.c Packet classifier 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 | * Changes: |
| 12 | * |
| 13 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support |
| 14 | * |
| 15 | */ |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/init.h> |
| 24 | #include <linux/kmod.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 25 | #include <linux/netlink.h> |
Patrick McHardy | ab27cfb | 2008-01-23 20:33:13 -0800 | [diff] [blame] | 26 | #include <linux/err.h> |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 27 | #include <net/net_namespace.h> |
| 28 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 29 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <net/pkt_sched.h> |
| 31 | #include <net/pkt_cls.h> |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | /* The list of all installed classifier types */ |
| 34 | |
Patrick McHardy | 2eb9d75 | 2008-01-22 22:10:42 -0800 | [diff] [blame] | 35 | static struct tcf_proto_ops *tcf_proto_base __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* Protects list of registered TC modules. It is pure SMP lock. */ |
| 38 | static DEFINE_RWLOCK(cls_mod_lock); |
| 39 | |
| 40 | /* Find classifier type by string name */ |
| 41 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 42 | static struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | { |
| 44 | struct tcf_proto_ops *t = NULL; |
| 45 | |
| 46 | if (kind) { |
| 47 | read_lock(&cls_mod_lock); |
| 48 | for (t = tcf_proto_base; t; t = t->next) { |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 49 | if (nla_strcmp(kind, t->kind) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (!try_module_get(t->owner)) |
| 51 | t = NULL; |
| 52 | break; |
| 53 | } |
| 54 | } |
| 55 | read_unlock(&cls_mod_lock); |
| 56 | } |
| 57 | return t; |
| 58 | } |
| 59 | |
| 60 | /* Register(unregister) new classifier type */ |
| 61 | |
| 62 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) |
| 63 | { |
| 64 | struct tcf_proto_ops *t, **tp; |
| 65 | int rc = -EEXIST; |
| 66 | |
| 67 | write_lock(&cls_mod_lock); |
| 68 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) |
| 69 | if (!strcmp(ops->kind, t->kind)) |
| 70 | goto out; |
| 71 | |
| 72 | ops->next = NULL; |
| 73 | *tp = ops; |
| 74 | rc = 0; |
| 75 | out: |
| 76 | write_unlock(&cls_mod_lock); |
| 77 | return rc; |
| 78 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 79 | EXPORT_SYMBOL(register_tcf_proto_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
| 82 | { |
| 83 | struct tcf_proto_ops *t, **tp; |
| 84 | int rc = -ENOENT; |
| 85 | |
| 86 | write_lock(&cls_mod_lock); |
| 87 | for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next) |
| 88 | if (t == ops) |
| 89 | break; |
| 90 | |
| 91 | if (!t) |
| 92 | goto out; |
| 93 | *tp = t->next; |
| 94 | rc = 0; |
| 95 | out: |
| 96 | write_unlock(&cls_mod_lock); |
| 97 | return rc; |
| 98 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 99 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 102 | struct tcf_proto *tp, unsigned long fh, int event); |
| 103 | |
| 104 | |
| 105 | /* Select new prio value from the range, managed by kernel. */ |
| 106 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 107 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 109 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | if (tp) |
| 112 | first = tp->prio-1; |
| 113 | |
| 114 | return first; |
| 115 | } |
| 116 | |
| 117 | /* Add/change/delete/get a filter node */ |
| 118 | |
| 119 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 120 | { |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 121 | struct net *net = skb->sk->sk_net; |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 122 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | struct tcmsg *t; |
| 124 | u32 protocol; |
| 125 | u32 prio; |
| 126 | u32 nprio; |
| 127 | u32 parent; |
| 128 | struct net_device *dev; |
| 129 | struct Qdisc *q; |
| 130 | struct tcf_proto **back, **chain; |
| 131 | struct tcf_proto *tp; |
| 132 | struct tcf_proto_ops *tp_ops; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 133 | const struct Qdisc_class_ops *cops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | unsigned long cl; |
| 135 | unsigned long fh; |
| 136 | int err; |
| 137 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 138 | if (net != &init_net) |
| 139 | return -EINVAL; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | replay: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | t = NLMSG_DATA(n); |
| 143 | protocol = TC_H_MIN(t->tcm_info); |
| 144 | prio = TC_H_MAJ(t->tcm_info); |
| 145 | nprio = prio; |
| 146 | parent = t->tcm_parent; |
| 147 | cl = 0; |
| 148 | |
| 149 | if (prio == 0) { |
| 150 | /* If no priority is given, user wants we allocated it. */ |
| 151 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 152 | return -ENOENT; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 153 | prio = TC_H_MAKE(0x80000000U, 0U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | /* Find head of filter chain. */ |
| 157 | |
| 158 | /* Find link */ |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 159 | dev = __dev_get_by_index(&init_net, t->tcm_ifindex); |
| 160 | if (dev == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return -ENODEV; |
| 162 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 163 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
| 164 | if (err < 0) |
| 165 | return err; |
| 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | /* Find qdisc */ |
| 168 | if (!parent) { |
| 169 | q = dev->qdisc_sleeping; |
| 170 | parent = q->handle; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 171 | } else { |
| 172 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); |
| 173 | if (q == NULL) |
| 174 | return -EINVAL; |
| 175 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | /* Is it classful? */ |
| 178 | if ((cops = q->ops->cl_ops) == NULL) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | /* Do we search for filter, attached to class? */ |
| 182 | if (TC_H_MIN(parent)) { |
| 183 | cl = cops->get(q, parent); |
| 184 | if (cl == 0) |
| 185 | return -ENOENT; |
| 186 | } |
| 187 | |
| 188 | /* And the last stroke */ |
| 189 | chain = cops->tcf_chain(q, cl); |
| 190 | err = -EINVAL; |
| 191 | if (chain == NULL) |
| 192 | goto errout; |
| 193 | |
| 194 | /* Check the chain for existence of proto-tcf with this priority */ |
| 195 | for (back = chain; (tp=*back) != NULL; back = &tp->next) { |
| 196 | if (tp->prio >= prio) { |
| 197 | if (tp->prio == prio) { |
| 198 | if (!nprio || (tp->protocol != protocol && protocol)) |
| 199 | goto errout; |
| 200 | } else |
| 201 | tp = NULL; |
| 202 | break; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | if (tp == NULL) { |
| 207 | /* Proto-tcf does not exist, create new one */ |
| 208 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 209 | if (tca[TCA_KIND] == NULL || !protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | goto errout; |
| 211 | |
| 212 | err = -ENOENT; |
| 213 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 214 | goto errout; |
| 215 | |
| 216 | |
| 217 | /* Create new proto tcf */ |
| 218 | |
| 219 | err = -ENOBUFS; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 220 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
| 221 | if (tp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | goto errout; |
| 223 | err = -EINVAL; |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 224 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | if (tp_ops == NULL) { |
| 226 | #ifdef CONFIG_KMOD |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 227 | struct nlattr *kind = tca[TCA_KIND]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | char name[IFNAMSIZ]; |
| 229 | |
| 230 | if (kind != NULL && |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 231 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | rtnl_unlock(); |
| 233 | request_module("cls_%s", name); |
| 234 | rtnl_lock(); |
| 235 | tp_ops = tcf_proto_lookup_ops(kind); |
| 236 | /* We dropped the RTNL semaphore in order to |
| 237 | * perform the module load. So, even if we |
| 238 | * succeeded in loading the module we have to |
| 239 | * replay the request. We indicate this using |
| 240 | * -EAGAIN. |
| 241 | */ |
| 242 | if (tp_ops != NULL) { |
| 243 | module_put(tp_ops->owner); |
| 244 | err = -EAGAIN; |
| 245 | } |
| 246 | } |
| 247 | #endif |
| 248 | kfree(tp); |
| 249 | goto errout; |
| 250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | tp->ops = tp_ops; |
| 252 | tp->protocol = protocol; |
| 253 | tp->prio = nprio ? : tcf_auto_prio(*back); |
| 254 | tp->q = q; |
| 255 | tp->classify = tp_ops->classify; |
| 256 | tp->classid = parent; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 257 | |
| 258 | err = tp_ops->init(tp); |
| 259 | if (err != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | module_put(tp_ops->owner); |
| 261 | kfree(tp); |
| 262 | goto errout; |
| 263 | } |
| 264 | |
| 265 | qdisc_lock_tree(dev); |
| 266 | tp->next = *back; |
| 267 | *back = tp; |
| 268 | qdisc_unlock_tree(dev); |
| 269 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 270 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | goto errout; |
| 272 | |
| 273 | fh = tp->ops->get(tp, t->tcm_handle); |
| 274 | |
| 275 | if (fh == 0) { |
| 276 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { |
| 277 | qdisc_lock_tree(dev); |
| 278 | *back = tp->next; |
| 279 | qdisc_unlock_tree(dev); |
| 280 | |
| 281 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); |
| 282 | tcf_destroy(tp); |
| 283 | err = 0; |
| 284 | goto errout; |
| 285 | } |
| 286 | |
| 287 | err = -ENOENT; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 288 | if (n->nlmsg_type != RTM_NEWTFILTER || |
| 289 | !(n->nlmsg_flags & NLM_F_CREATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | goto errout; |
| 291 | } else { |
| 292 | switch (n->nlmsg_type) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 293 | case RTM_NEWTFILTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | err = -EEXIST; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 295 | if (n->nlmsg_flags & NLM_F_EXCL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | goto errout; |
| 297 | break; |
| 298 | case RTM_DELTFILTER: |
| 299 | err = tp->ops->delete(tp, fh); |
| 300 | if (err == 0) |
| 301 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); |
| 302 | goto errout; |
| 303 | case RTM_GETTFILTER: |
| 304 | err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); |
| 305 | goto errout; |
| 306 | default: |
| 307 | err = -EINVAL; |
| 308 | goto errout; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh); |
| 313 | if (err == 0) |
| 314 | tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); |
| 315 | |
| 316 | errout: |
| 317 | if (cl) |
| 318 | cops->put(q, cl); |
| 319 | if (err == -EAGAIN) |
| 320 | /* Replay the request. */ |
| 321 | goto replay; |
| 322 | return err; |
| 323 | } |
| 324 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 325 | static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, |
| 326 | unsigned long fh, u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | struct tcmsg *tcm; |
| 329 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 330 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 332 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | tcm = NLMSG_DATA(nlh); |
| 334 | tcm->tcm_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 335 | tcm->tcm__pad1 = 0; |
| 336 | tcm->tcm__pad1 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | tcm->tcm_ifindex = tp->q->dev->ifindex; |
| 338 | tcm->tcm_parent = tp->classid; |
| 339 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
Patrick McHardy | 57e1c48 | 2008-01-23 20:34:28 -0800 | [diff] [blame] | 340 | NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | tcm->tcm_handle = fh; |
| 342 | if (RTM_DELTFILTER != event) { |
| 343 | tcm->tcm_handle = 0; |
| 344 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 345 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 347 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | return skb->len; |
| 349 | |
| 350 | nlmsg_failure: |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 351 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 352 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return -1; |
| 354 | } |
| 355 | |
| 356 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 357 | struct tcf_proto *tp, unsigned long fh, int event) |
| 358 | { |
| 359 | struct sk_buff *skb; |
| 360 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 361 | |
| 362 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 363 | if (!skb) |
| 364 | return -ENOBUFS; |
| 365 | |
| 366 | if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) { |
| 367 | kfree_skb(skb); |
| 368 | return -EINVAL; |
| 369 | } |
| 370 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 371 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, |
| 372 | n->nlmsg_flags & NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 375 | struct tcf_dump_args { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | struct tcf_walker w; |
| 377 | struct sk_buff *skb; |
| 378 | struct netlink_callback *cb; |
| 379 | }; |
| 380 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 381 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
| 382 | struct tcf_walker *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 384 | struct tcf_dump_args *a = (void *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid, |
| 387 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
| 388 | } |
| 389 | |
| 390 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
| 391 | { |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 392 | struct net *net = skb->sk->sk_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | int t; |
| 394 | int s_t; |
| 395 | struct net_device *dev; |
| 396 | struct Qdisc *q; |
| 397 | struct tcf_proto *tp, **chain; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 398 | struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | unsigned long cl = 0; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 400 | const struct Qdisc_class_ops *cops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | struct tcf_dump_args arg; |
| 402 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 403 | if (net != &init_net) |
| 404 | return 0; |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
| 407 | return skb->len; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 408 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | return skb->len; |
| 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (!tcm->tcm_parent) |
| 412 | q = dev->qdisc_sleeping; |
| 413 | else |
| 414 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); |
| 415 | if (!q) |
| 416 | goto out; |
| 417 | if ((cops = q->ops->cl_ops) == NULL) |
| 418 | goto errout; |
| 419 | if (TC_H_MIN(tcm->tcm_parent)) { |
| 420 | cl = cops->get(q, tcm->tcm_parent); |
| 421 | if (cl == 0) |
| 422 | goto errout; |
| 423 | } |
| 424 | chain = cops->tcf_chain(q, cl); |
| 425 | if (chain == NULL) |
| 426 | goto errout; |
| 427 | |
| 428 | s_t = cb->args[0]; |
| 429 | |
| 430 | for (tp=*chain, t=0; tp; tp = tp->next, t++) { |
| 431 | if (t < s_t) continue; |
| 432 | if (TC_H_MAJ(tcm->tcm_info) && |
| 433 | TC_H_MAJ(tcm->tcm_info) != tp->prio) |
| 434 | continue; |
| 435 | if (TC_H_MIN(tcm->tcm_info) && |
| 436 | TC_H_MIN(tcm->tcm_info) != tp->protocol) |
| 437 | continue; |
| 438 | if (t > s_t) |
| 439 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 440 | if (cb->args[1] == 0) { |
| 441 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid, |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 442 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| 443 | RTM_NEWTFILTER) <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | break; |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | cb->args[1] = 1; |
| 447 | } |
| 448 | if (tp->ops->walk == NULL) |
| 449 | continue; |
| 450 | arg.w.fn = tcf_node_dump; |
| 451 | arg.skb = skb; |
| 452 | arg.cb = cb; |
| 453 | arg.w.stop = 0; |
| 454 | arg.w.skip = cb->args[1]-1; |
| 455 | arg.w.count = 0; |
| 456 | tp->ops->walk(tp, &arg.w); |
| 457 | cb->args[1] = arg.w.count+1; |
| 458 | if (arg.w.stop) |
| 459 | break; |
| 460 | } |
| 461 | |
| 462 | cb->args[0] = t; |
| 463 | |
| 464 | errout: |
| 465 | if (cl) |
| 466 | cops->put(q, cl); |
| 467 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | dev_put(dev); |
| 469 | return skb->len; |
| 470 | } |
| 471 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 472 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
| 474 | #ifdef CONFIG_NET_CLS_ACT |
| 475 | if (exts->action) { |
| 476 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); |
| 477 | exts->action = NULL; |
| 478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | #endif |
| 480 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 481 | EXPORT_SYMBOL(tcf_exts_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 483 | int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, |
| 484 | struct nlattr *rate_tlv, struct tcf_exts *exts, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 485 | struct tcf_ext_map *map) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
| 487 | memset(exts, 0, sizeof(*exts)); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | #ifdef CONFIG_NET_CLS_ACT |
| 490 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | struct tc_action *act; |
| 492 | |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 493 | if (map->police && tb[map->police]) { |
Patrick McHardy | 7ba699c | 2008-01-22 22:11:50 -0800 | [diff] [blame] | 494 | act = tcf_action_init_1(tb[map->police], rate_tlv, |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 495 | "police", TCA_ACT_NOREPLACE, |
Patrick McHardy | ab27cfb | 2008-01-23 20:33:13 -0800 | [diff] [blame] | 496 | TCA_ACT_BIND); |
| 497 | if (IS_ERR(act)) |
| 498 | return PTR_ERR(act); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
| 500 | act->type = TCA_OLD_COMPAT; |
| 501 | exts->action = act; |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 502 | } else if (map->action && tb[map->action]) { |
Patrick McHardy | 7ba699c | 2008-01-22 22:11:50 -0800 | [diff] [blame] | 503 | act = tcf_action_init(tb[map->action], rate_tlv, NULL, |
Patrick McHardy | ab27cfb | 2008-01-23 20:33:13 -0800 | [diff] [blame] | 504 | TCA_ACT_NOREPLACE, TCA_ACT_BIND); |
| 505 | if (IS_ERR(act)) |
| 506 | return PTR_ERR(act); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | exts->action = act; |
| 509 | } |
| 510 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | #else |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 512 | if ((map->action && tb[map->action]) || |
| 513 | (map->police && tb[map->police])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | return -EOPNOTSUPP; |
| 515 | #endif |
| 516 | |
| 517 | return 0; |
| 518 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 519 | EXPORT_SYMBOL(tcf_exts_validate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 521 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
| 522 | struct tcf_exts *src) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
| 524 | #ifdef CONFIG_NET_CLS_ACT |
| 525 | if (src->action) { |
| 526 | struct tc_action *act; |
| 527 | tcf_tree_lock(tp); |
| 528 | act = xchg(&dst->action, src->action); |
| 529 | tcf_tree_unlock(tp); |
| 530 | if (act) |
| 531 | tcf_action_destroy(act, TCA_ACT_UNBIND); |
| 532 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | #endif |
| 534 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 535 | EXPORT_SYMBOL(tcf_exts_change); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 537 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | struct tcf_ext_map *map) |
| 539 | { |
| 540 | #ifdef CONFIG_NET_CLS_ACT |
| 541 | if (map->action && exts->action) { |
| 542 | /* |
| 543 | * again for backward compatible mode - we want |
| 544 | * to work with both old and new modes of entering |
| 545 | * tc data even if iproute2 was newer - jhs |
| 546 | */ |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 547 | struct nlattr *nest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | if (exts->action->type != TCA_OLD_COMPAT) { |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 550 | nest = nla_nest_start(skb, map->action); |
| 551 | if (nest == NULL) |
| 552 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 554 | goto nla_put_failure; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 555 | nla_nest_end(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } else if (map->police) { |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 557 | nest = nla_nest_start(skb, map->police); |
| 558 | if (nest == NULL) |
| 559 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 561 | goto nla_put_failure; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 562 | nla_nest_end(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | #endif |
| 566 | return 0; |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 567 | nla_put_failure: __attribute__ ((unused)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return -1; |
| 569 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 570 | EXPORT_SYMBOL(tcf_exts_dump); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 572 | |
| 573 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, |
| 574 | struct tcf_ext_map *map) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
| 576 | #ifdef CONFIG_NET_CLS_ACT |
| 577 | if (exts->action) |
| 578 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 579 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | #endif |
| 581 | return 0; |
Patrick McHardy | add93b6 | 2008-01-22 22:11:33 -0800 | [diff] [blame] | 582 | nla_put_failure: __attribute__ ((unused)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | return -1; |
| 584 | } |
Stephen Hemminger | aa767bf | 2008-01-21 02:26:41 -0800 | [diff] [blame] | 585 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | static int __init tc_filter_init(void) |
| 588 | { |
Thomas Graf | 82623c0 | 2007-03-22 11:56:22 -0700 | [diff] [blame] | 589 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL); |
| 590 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL); |
| 591 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
| 592 | tc_dump_tfilter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | subsys_initcall(tc_filter_init); |