libnl 3.5.0

cgroup.c
1 /*
2 * lib/route/cls/cgroup.c Control Groups Classifier
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2009-2013 Thomas Graf <tgraf@suug.ch>
10 */
11
12 /**
13 * @ingroup cls
14 * @defgroup cls_cgroup Control Groups Classifier
15 *
16 * @{
17 */
18
19 #include <netlink-private/netlink.h>
20 #include <netlink-private/tc.h>
21 #include <netlink/netlink.h>
22 #include <netlink/attr.h>
23 #include <netlink/utils.h>
24 #include <netlink-private/route/tc-api.h>
25 #include <netlink/route/classifier.h>
26 #include <netlink/route/cls/cgroup.h>
27 #include <netlink/route/cls/ematch.h>
28
29 /** @cond SKIP */
30 #define CGROUP_ATTR_EMATCH 0x001
31 /** @endcond */
32
33 static struct nla_policy cgroup_policy[TCA_CGROUP_MAX+1] = {
34 [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED },
35 };
36
37 static int cgroup_clone(void *_dst, void *_src)
38 {
39 struct rtnl_cgroup *dst = NULL, *src = _src;
40
41 dst = calloc(1, sizeof(*dst));
42 if (!dst)
43 return -NLE_NOMEM;
44
45 dst->cg_mask = src->cg_mask;
46 dst->cg_ematch = rtnl_ematch_tree_clone(src->cg_ematch);
47 if (!dst) {
48 free(dst);
49 return -NLE_NOMEM;
50 }
51
52 return 0;
53 }
54
55 static void cgroup_free_data(struct rtnl_tc *tc, void *data)
56 {
57 struct rtnl_cgroup *c = data;
58
59 if (!c)
60 return;
61
62 rtnl_ematch_tree_free(c->cg_ematch);
63 }
64
65 static int cgroup_msg_parser(struct rtnl_tc *tc, void *data)
66 {
67 struct nlattr *tb[TCA_CGROUP_MAX + 1];
68 struct rtnl_cgroup *c = data;
69 int err;
70
71 err = tca_parse(tb, TCA_CGROUP_MAX, tc, cgroup_policy);
72 if (err < 0)
73 return err;
74
75 if (tb[TCA_CGROUP_EMATCHES]) {
76 if ((err = rtnl_ematch_parse_attr(tb[TCA_CGROUP_EMATCHES],
77 &c->cg_ematch)) < 0)
78 return err;
79 c->cg_mask |= CGROUP_ATTR_EMATCH;
80 }
81
82 #if 0
83 TODO:
84 TCA_CGROUP_ACT,
85 TCA_CGROUP_POLICE,
86 #endif
87
88 return 0;
89 }
90
91 static void cgroup_dump_line(struct rtnl_tc *tc, void *data,
92 struct nl_dump_params *p)
93 {
94 struct rtnl_cgroup *c = data;
95
96 if (!c)
97 return;
98
99 if (c->cg_mask & CGROUP_ATTR_EMATCH)
100 nl_dump(p, " ematch");
101 else
102 nl_dump(p, " match-all");
103 }
104
105 static void cgroup_dump_details(struct rtnl_tc *tc, void *data,
106 struct nl_dump_params *p)
107 {
108 struct rtnl_cgroup *c = data;
109
110 if (!c)
111 return;
112
113 if (c->cg_mask & CGROUP_ATTR_EMATCH) {
114 nl_dump_line(p, " ematch ");
115
116 if (c->cg_ematch)
117 rtnl_ematch_tree_dump(c->cg_ematch, p);
118 else
119 nl_dump(p, "<no tree>");
120 } else
121 nl_dump(p, "no options");
122 }
123
124 static int cgroup_fill_msg(struct rtnl_tc *tc, void *data,
125 struct nl_msg *msg)
126 {
127 struct rtnl_cgroup *c = data;
128
129 if (!c)
130 BUG();
131
132 if (!(tc->ce_mask & TCA_ATTR_HANDLE))
133 return -NLE_MISSING_ATTR;
134
135 if (c->cg_mask & CGROUP_ATTR_EMATCH)
136 return rtnl_ematch_fill_attr(msg, TCA_CGROUP_EMATCHES,
137 c->cg_ematch);
138
139 return 0;
140 }
141
142
143 /**
144 * @name Attribute Modifications
145 * @{
146 */
147
148 void rtnl_cgroup_set_ematch(struct rtnl_cls *cls, struct rtnl_ematch_tree *tree)
149 {
150 struct rtnl_cgroup *c;
151
152 if (!(c = rtnl_tc_data(TC_CAST(cls))))
153 BUG();
154
155 if (c->cg_ematch) {
156 rtnl_ematch_tree_free(c->cg_ematch);
157 c->cg_mask &= ~CGROUP_ATTR_EMATCH;
158 }
159
160 c->cg_ematch = tree;
161
162 if (tree)
163 c->cg_mask |= CGROUP_ATTR_EMATCH;
164 }
165
166 struct rtnl_ematch_tree *rtnl_cgroup_get_ematch(struct rtnl_cls *cls)
167 {
168 struct rtnl_cgroup *c;
169
170 if (!(c = rtnl_tc_data(TC_CAST(cls))))
171 BUG();
172
173 return c->cg_ematch;
174 }
175
176 /** @} */
177
178 static struct rtnl_tc_ops cgroup_ops = {
179 .to_kind = "cgroup",
180 .to_type = RTNL_TC_TYPE_CLS,
181 .to_size = sizeof(struct rtnl_cgroup),
182 .to_clone = cgroup_clone,
183 .to_msg_parser = cgroup_msg_parser,
184 .to_free_data = cgroup_free_data,
185 .to_msg_fill = cgroup_fill_msg,
186 .to_dump = {
187 [NL_DUMP_LINE] = cgroup_dump_line,
188 [NL_DUMP_DETAILS] = cgroup_dump_details,
189 },
190 };
191
192 static void __init cgroup_init(void)
193 {
194 rtnl_tc_register(&cgroup_ops);
195 }
196
197 static void __exit cgroup_exit(void)
198 {
199 rtnl_tc_unregister(&cgroup_ops);
200 }
201
202 /** @} */
NL_DUMP_LINE
Dump object briefly on one line.
Definition: types.h:22
rtnl_tc_register
int rtnl_tc_register(struct rtnl_tc_ops *ops)
Register a traffic control module.
Definition: tc.c:1021
nla_policy
Attribute validation policy.
Definition: attr.h:69
rtnl_ematch_tree_clone
struct rtnl_ematch_tree * rtnl_ematch_tree_clone(struct rtnl_ematch_tree *src)
Clone ematch tree object.
Definition: ematch.c:334
rtnl_ematch_tree_free
void rtnl_ematch_tree_free(struct rtnl_ematch_tree *tree)
Free ematch tree object.
Definition: ematch.c:280
NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition: types.h:23
rtnl_tc_unregister
void rtnl_tc_unregister(struct rtnl_tc_ops *ops)
Unregister a traffic control module.
Definition: tc.c:1055
rtnl_ematch_parse_attr
int rtnl_ematch_parse_attr(struct nlattr *attr, struct rtnl_ematch_tree **result)
Parse ematch netlink attributes.
Definition: ematch.c:398
TC_CAST
#define TC_CAST(ptr)
Macro to cast qdisc/class/classifier to tc object.
Definition: tc.h:56
rtnl_tc_data
void * rtnl_tc_data(struct rtnl_tc *tc)
Return pointer to private data of traffic control object.
Definition: tc.c:1082
NLA_NESTED
Nested attributes.
Definition: attr.h:48
nla_policy::type
uint16_t type
Type of attribute or NLA_UNSPEC.
Definition: attr.h:71
nl_dump_params
Dumping parameters.
Definition: types.h:33
nl_dump
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition: utils.c:962