Blame view
net/sched/cls_cgroup.c
7.21 KB
f40092373 pkt_sched: Contro... |
1 2 3 4 5 6 7 8 9 10 11 12 |
/* * net/sched/cls_cgroup.c Control Group Classifier * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: Thomas Graf <tgraf@suug.ch> */ #include <linux/module.h> |
5a0e3ad6a include cleanup: ... |
13 |
#include <linux/slab.h> |
f40092373 pkt_sched: Contro... |
14 15 16 17 18 |
#include <linux/types.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/skbuff.h> #include <linux/cgroup.h> |
f84517253 cls_cgroup: Store... |
19 |
#include <linux/rcupdate.h> |
f40092373 pkt_sched: Contro... |
20 21 |
#include <net/rtnetlink.h> #include <net/pkt_cls.h> |
f84517253 cls_cgroup: Store... |
22 23 |
#include <net/sock.h> #include <net/cls_cgroup.h> |
f40092373 pkt_sched: Contro... |
24 |
|
8e039d84b cgroups: net_cls ... |
25 26 27 28 29 30 31 32 33 34 35 36 |
static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss, struct cgroup *cgrp); static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp); static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp); struct cgroup_subsys net_cls_subsys = { .name = "net_cls", .create = cgrp_create, .destroy = cgrp_destroy, .populate = cgrp_populate, #ifdef CONFIG_NET_CLS_CGROUP .subsys_id = net_cls_subsys_id, |
8e039d84b cgroups: net_cls ... |
37 38 39 |
#endif .module = THIS_MODULE, }; |
8e8ba8541 cls_cgroup: clean... |
40 |
static inline struct cgroup_cls_state *cgrp_cls_state(struct cgroup *cgrp) |
f40092373 pkt_sched: Contro... |
41 |
{ |
8e8ba8541 cls_cgroup: clean... |
42 43 44 45 46 47 48 49 |
return container_of(cgroup_subsys_state(cgrp, net_cls_subsys_id), struct cgroup_cls_state, css); } static inline struct cgroup_cls_state *task_cls_state(struct task_struct *p) { return container_of(task_subsys_state(p, net_cls_subsys_id), struct cgroup_cls_state, css); |
f40092373 pkt_sched: Contro... |
50 51 52 53 54 55 |
} static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss, struct cgroup *cgrp) { struct cgroup_cls_state *cs; |
cc7ec456f net_sched: cleanups |
56 57 |
cs = kzalloc(sizeof(*cs), GFP_KERNEL); if (!cs) |
f40092373 pkt_sched: Contro... |
58 59 60 |
return ERR_PTR(-ENOMEM); if (cgrp->parent) |
8e8ba8541 cls_cgroup: clean... |
61 |
cs->classid = cgrp_cls_state(cgrp->parent)->classid; |
f40092373 pkt_sched: Contro... |
62 63 64 65 66 67 |
return &cs->css; } static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp) { |
8e8ba8541 cls_cgroup: clean... |
68 |
kfree(cgrp_cls_state(cgrp)); |
f40092373 pkt_sched: Contro... |
69 70 71 72 |
} static u64 read_classid(struct cgroup *cgrp, struct cftype *cft) { |
8e8ba8541 cls_cgroup: clean... |
73 |
return cgrp_cls_state(cgrp)->classid; |
f40092373 pkt_sched: Contro... |
74 75 76 77 |
} static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value) { |
8e8ba8541 cls_cgroup: clean... |
78 |
cgrp_cls_state(cgrp)->classid = (u32) value; |
f40092373 pkt_sched: Contro... |
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 |
return 0; } static struct cftype ss_files[] = { { .name = "classid", .read_u64 = read_classid, .write_u64 = write_classid, }, }; static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp) { return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files)); } |
cc7ec456f net_sched: cleanups |
94 |
struct cls_cgroup_head { |
f40092373 pkt_sched: Contro... |
95 96 97 98 |
u32 handle; struct tcf_exts exts; struct tcf_ematch_tree ematches; }; |
dc7f9f6e8 net: sched: const... |
99 |
static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
f40092373 pkt_sched: Contro... |
100 101 102 |
struct tcf_result *res) { struct cls_cgroup_head *head = tp->root; |
e65fcfd63 cls_cgroup: read ... |
103 |
u32 classid; |
f40092373 pkt_sched: Contro... |
104 |
|
f84517253 cls_cgroup: Store... |
105 106 107 |
rcu_read_lock(); classid = task_cls_state(current)->classid; rcu_read_unlock(); |
f40092373 pkt_sched: Contro... |
108 109 110 111 112 113 114 115 116 117 |
/* * Due to the nature of the classifier it is required to ignore all * packets originating from softirq context as accessing `current' * would lead to false results. * * This test assumes that all callers of dev_queue_xmit() explicitely * disable bh. Knowing this, it is possible to detect softirq based * calls by looking at the number of nested bh disable calls because * softirqs always disables bh. */ |
75e1056f5 sched: Fix softir... |
118 |
if (in_serving_softirq()) { |
f84517253 cls_cgroup: Store... |
119 120 121 122 123 |
/* If there is an sk_classid we'll use that. */ if (!skb->sk) return -1; classid = skb->sk->sk_classid; } |
f40092373 pkt_sched: Contro... |
124 |
|
e65fcfd63 cls_cgroup: read ... |
125 126 127 128 129 130 131 132 133 |
if (!classid) return -1; if (!tcf_em_tree_match(skb, &head->ematches, NULL)) return -1; res->classid = classid; res->class = 0; return tcf_exts_exec(skb, &head->exts, res); |
f40092373 pkt_sched: Contro... |
134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 |
} static unsigned long cls_cgroup_get(struct tcf_proto *tp, u32 handle) { return 0UL; } static void cls_cgroup_put(struct tcf_proto *tp, unsigned long f) { } static int cls_cgroup_init(struct tcf_proto *tp) { return 0; } static const struct tcf_ext_map cgroup_ext_map = { .action = TCA_CGROUP_ACT, .police = TCA_CGROUP_POLICE, }; static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = { [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED }, }; static int cls_cgroup_change(struct tcf_proto *tp, unsigned long base, u32 handle, struct nlattr **tca, unsigned long *arg) { |
cc7ec456f net_sched: cleanups |
163 |
struct nlattr *tb[TCA_CGROUP_MAX + 1]; |
f40092373 pkt_sched: Contro... |
164 165 166 167 |
struct cls_cgroup_head *head = tp->root; struct tcf_ematch_tree t; struct tcf_exts e; int err; |
52ea3a56a cls_cgroup: Fix o... |
168 169 |
if (!tca[TCA_OPTIONS]) return -EINVAL; |
f40092373 pkt_sched: Contro... |
170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 |
if (head == NULL) { if (!handle) return -EINVAL; head = kzalloc(sizeof(*head), GFP_KERNEL); if (head == NULL) return -ENOBUFS; head->handle = handle; tcf_tree_lock(tp); tp->root = head; tcf_tree_unlock(tp); } if (handle != head->handle) return -ENOENT; err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS], cgroup_policy); if (err < 0) return err; err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &cgroup_ext_map); if (err < 0) return err; err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t); if (err < 0) return err; tcf_exts_change(tp, &head->exts, &e); tcf_em_tree_change(tp, &head->ematches, &t); return 0; } static void cls_cgroup_destroy(struct tcf_proto *tp) { |
47a1a1d4b pkt_sched: remove... |
209 |
struct cls_cgroup_head *head = tp->root; |
f40092373 pkt_sched: Contro... |
210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 |
if (head) { tcf_exts_destroy(tp, &head->exts); tcf_em_tree_destroy(tp, &head->ematches); kfree(head); } } static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg) { return -EOPNOTSUPP; } static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg) { struct cls_cgroup_head *head = tp->root; if (arg->count < arg->skip) goto skip; if (arg->fn(tp, (unsigned long) head, arg) < 0) { arg->stop = 1; return; } skip: arg->count++; } static int cls_cgroup_dump(struct tcf_proto *tp, unsigned long fh, struct sk_buff *skb, struct tcmsg *t) { struct cls_cgroup_head *head = tp->root; unsigned char *b = skb_tail_pointer(skb); struct nlattr *nest; t->tcm_handle = head->handle; nest = nla_nest_start(skb, TCA_OPTIONS); if (nest == NULL) goto nla_put_failure; if (tcf_exts_dump(skb, &head->exts, &cgroup_ext_map) < 0 || tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) goto nla_put_failure; nla_nest_end(skb, nest); if (tcf_exts_dump_stats(skb, &head->exts, &cgroup_ext_map) < 0) goto nla_put_failure; return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; } static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { .kind = "cgroup", .init = cls_cgroup_init, .change = cls_cgroup_change, .classify = cls_cgroup_classify, .destroy = cls_cgroup_destroy, .get = cls_cgroup_get, .put = cls_cgroup_put, .delete = cls_cgroup_delete, .walk = cls_cgroup_walk, .dump = cls_cgroup_dump, .owner = THIS_MODULE, }; static int __init init_cgroup_cls(void) { |
f84517253 cls_cgroup: Store... |
283 |
int ret; |
8e039d84b cgroups: net_cls ... |
284 285 |
ret = cgroup_load_subsys(&net_cls_subsys); if (ret) |
f84517253 cls_cgroup: Store... |
286 287 288 289 290 291 292 293 294 295 296 297 298 |
goto out; #ifndef CONFIG_NET_CLS_CGROUP /* We can't use rcu_assign_pointer because this is an int. */ smp_wmb(); net_cls_subsys_id = net_cls_subsys.subsys_id; #endif ret = register_tcf_proto_ops(&cls_cgroup_ops); if (ret) cgroup_unload_subsys(&net_cls_subsys); out: |
8e039d84b cgroups: net_cls ... |
299 |
return ret; |
f40092373 pkt_sched: Contro... |
300 301 302 303 304 |
} static void __exit exit_cgroup_cls(void) { unregister_tcf_proto_ops(&cls_cgroup_ops); |
f84517253 cls_cgroup: Store... |
305 306 307 308 309 |
#ifndef CONFIG_NET_CLS_CGROUP net_cls_subsys_id = -1; synchronize_rcu(); #endif |
8e039d84b cgroups: net_cls ... |
310 |
cgroup_unload_subsys(&net_cls_subsys); |
f40092373 pkt_sched: Contro... |
311 312 313 314 315 |
} module_init(init_cgroup_cls); module_exit(exit_cgroup_cls); MODULE_LICENSE("GPL"); |