1 /*
2 * lib/route/cls/basic.c Basic 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) 2008-2009 Thomas Graf <tgraf@suug.ch>
10 */
11
12 /**
13 * @ingroup cls
14 * @defgroup basic Basic Classifier
15 *
16 * @par Introduction
17 * The basic classifier is the simplest form of a classifier. It does
18 * not have any special classification capabilities, instead it can be
19 * used to classify exclusively based on extended matches or to
20 * create a "catch-all" filter.
21 *
22 * @{
23 */
24
25 #include <netlink-local.h>
26 #include <netlink-tc.h>
27 #include <netlink/netlink.h>
28 #include <netlink/route/classifier.h>
29 #include <netlink/route/classifier-modules.h>
30 #include <netlink/route/cls/basic.h>
31 #include <netlink/route/cls/ematch.h>
32
33 struct rtnl_basic
34 {
35 uint32_t b_classid;
36 struct rtnl_ematch_tree * b_ematch;
37 int b_mask;
38 };
39
40 /** @cond SKIP */
41 #define BASIC_ATTR_CLASSID 0x001
42 #define BASIC_ATTR_EMATCH 0x002
43 /** @endcond */
44
45 static struct nla_policy basic_policy[TCA_FW_MAX+1] = {
46 [TCA_BASIC_CLASSID] = { .type = NLA_U32 },
47 [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
48 [TCA_BASIC_ACT] = { .type = NLA_NESTED },
49 [TCA_BASIC_POLICE] = { .type = NLA_NESTED },
50 };
51
basic_clone(struct rtnl_cls * _dst,struct rtnl_cls * _src)52 static int basic_clone(struct rtnl_cls *_dst, struct rtnl_cls *_src)
53 {
54 return -NLE_OPNOTSUPP;
55 }
56
basic_free_data(struct rtnl_cls * cls)57 static void basic_free_data(struct rtnl_cls *cls)
58 {
59 struct rtnl_basic *basic = rtnl_cls_data(cls);
60
61 rtnl_ematch_tree_free(basic->b_ematch);
62 }
63
basic_msg_parser(struct rtnl_cls * cls)64 static int basic_msg_parser(struct rtnl_cls *cls)
65 {
66 struct nlattr *tb[TCA_BASIC_MAX + 1];
67 struct rtnl_basic *basic = rtnl_cls_data(cls);
68 int err;
69
70 err = tca_parse(tb, TCA_BASIC_MAX, (struct rtnl_tca *) cls, basic_policy);
71 if (err < 0)
72 return err;
73
74 if (tb[TCA_BASIC_CLASSID]) {
75 basic->b_classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
76 basic->b_mask |= BASIC_ATTR_CLASSID;
77 }
78
79 if (tb[TCA_BASIC_EMATCHES]) {
80 if ((err = rtnl_ematch_parse(tb[TCA_BASIC_EMATCHES],
81 &basic->b_ematch)) < 0)
82 return err;
83
84 if (basic->b_ematch)
85 basic->b_mask |= BASIC_ATTR_EMATCH;
86 }
87
88 if (tb[TCA_BASIC_ACT]) {
89 /* XXX */
90 }
91
92 if (tb[TCA_BASIC_POLICE]) {
93 /* XXX */
94 }
95
96 return 0;
97 }
98
basic_dump_line(struct rtnl_cls * cls,struct nl_dump_params * p)99 static void basic_dump_line(struct rtnl_cls *cls, struct nl_dump_params *p)
100 {
101 struct rtnl_basic *b = rtnl_cls_data(cls);
102 char buf[32];
103
104 if (b->b_mask & BASIC_ATTR_EMATCH)
105 nl_dump(p, " ematch");
106 else
107 nl_dump(p, " match-all");
108
109 if (b->b_mask & BASIC_ATTR_CLASSID)
110 nl_dump(p, " classify-to %s",
111 rtnl_tc_handle2str(b->b_classid, buf, sizeof(buf)));
112 }
113
basic_dump_details(struct rtnl_cls * cls,struct nl_dump_params * p)114 static void basic_dump_details(struct rtnl_cls *cls, struct nl_dump_params *p)
115 {
116 struct rtnl_basic *b = rtnl_cls_data(cls);
117
118 if (b->b_mask & BASIC_ATTR_EMATCH) {
119 nl_dump(p, "\n");
120 nl_dump_line(p, " ematch ");
121 rtnl_ematch_tree_dump(b->b_ematch, p);
122 } else
123 nl_dump(p, "no options.\n");
124 }
125
basic_get_opts(struct rtnl_cls * cls,struct nl_msg * msg)126 static int basic_get_opts(struct rtnl_cls *cls, struct nl_msg *msg)
127 {
128 struct rtnl_basic *b = rtnl_cls_data(cls);
129
130 if (!(b->b_mask & BASIC_ATTR_CLASSID))
131 return -NLE_MISSING_ATTR;
132
133 NLA_PUT_U32(msg, TCA_BASIC_CLASSID, b->b_classid);
134
135 return 0;
136
137 nla_put_failure:
138 return -NLE_NOMEM;
139 }
140
141 /**
142 * @name Attribute Modifications
143 * @{
144 */
145
rtnl_basic_set_classid(struct rtnl_cls * cls,uint32_t classid)146 int rtnl_basic_set_classid(struct rtnl_cls *cls, uint32_t classid)
147 {
148 struct rtnl_basic *b = rtnl_cls_data(cls);
149
150 b->b_classid = classid;
151 b->b_mask |= BASIC_ATTR_CLASSID;
152
153 return 0;
154 }
155
rtnl_basic_get_classid(struct rtnl_cls * cls)156 uint32_t rtnl_basic_get_classid(struct rtnl_cls *cls)
157 {
158 struct rtnl_basic *b = rtnl_cls_data(cls);
159
160 return b->b_classid;
161 }
162
rtnl_basic_set_ematch(struct rtnl_cls * cls,struct rtnl_ematch_tree * tree)163 int rtnl_basic_set_ematch(struct rtnl_cls *cls, struct rtnl_ematch_tree *tree)
164 {
165 struct rtnl_basic *b = rtnl_cls_data(cls);
166
167 if (b->b_ematch) {
168 rtnl_ematch_tree_free(b->b_ematch);
169 b->b_mask &= ~BASIC_ATTR_EMATCH;
170 }
171
172 b->b_ematch = tree;
173
174 if (tree)
175 b->b_mask |= BASIC_ATTR_EMATCH;
176
177 return 0;
178 }
179
rtnl_basic_get_ematch(struct rtnl_cls * cls)180 struct rtnl_ematch_tree *rtnl_basic_get_ematch(struct rtnl_cls *cls)
181 {
182 struct rtnl_basic *b = rtnl_cls_data(cls);
183 return b->b_ematch;
184 }
185
186 /** @} */
187
188 static struct rtnl_cls_ops basic_ops = {
189 .co_kind = "basic",
190 .co_size = sizeof(struct rtnl_basic),
191 .co_msg_parser = basic_msg_parser,
192 .co_clone = basic_clone,
193 .co_free_data = basic_free_data,
194 .co_get_opts = basic_get_opts,
195 .co_dump = {
196 [NL_DUMP_LINE] = basic_dump_line,
197 [NL_DUMP_DETAILS] = basic_dump_details,
198 },
199 };
200
basic_init(void)201 static void __init basic_init(void)
202 {
203 rtnl_cls_register(&basic_ops);
204 }
205
basic_exit(void)206 static void __exit basic_exit(void)
207 {
208 rtnl_cls_unregister(&basic_ops);
209 }
210
211 /** @} */
212