libnl  3.5.0
mall.c
1 /*
2  * lib/route/cls/mall.c match-all 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) 2017 Volodymyr Bendiuga <volodymyr.bendiuga@gmail.com>
10  */
11 
12 /**
13  * @ingroup cls
14  * @defgroup cls_mall Match-all 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/matchall.h>
27 #include <netlink/route/action.h>
28 
29 
30 #define MALL_ATTR_CLASSID 0x01
31 #define MALL_ATTR_FLAGS 0x02
32 #define MALL_ATTR_ACTION 0x03
33 
34 
35 static struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
36  [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
37  [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 },
38 };
39 
40 /**
41  * @name Attribute Modifications
42  * @{
43  */
44 
45 int rtnl_mall_set_classid(struct rtnl_cls *cls, uint32_t classid)
46 {
47  struct rtnl_mall *mall;
48  if (!(mall = rtnl_tc_data(TC_CAST(cls))))
49  return -NLE_NOMEM;
50 
51  mall->m_classid = classid;
52  mall->m_mask |= MALL_ATTR_CLASSID;
53 
54  return 0;
55 }
56 
57 int rtnl_mall_get_classid(struct rtnl_cls *cls, uint32_t *classid)
58 {
59  struct rtnl_mall *mall;
60 
61  if (!(mall = rtnl_tc_data_peek(TC_CAST(cls))))
62  return -NLE_INVAL;
63 
64  if (!(mall->m_mask & MALL_ATTR_CLASSID))
65  return -NLE_INVAL;
66 
67  *classid = mall->m_classid;
68  return 0;
69 }
70 
71 int rtnl_mall_set_flags(struct rtnl_cls *cls, uint32_t flags)
72 {
73  struct rtnl_mall *mall;
74 
75  if (!(mall = rtnl_tc_data(TC_CAST(cls))))
76  return -NLE_NOMEM;
77 
78  mall->m_flags = flags;
79  mall->m_mask |= MALL_ATTR_FLAGS;
80 
81  return 0;
82 }
83 
84 int rtnl_mall_get_flags(struct rtnl_cls *cls, uint32_t *flags)
85 {
86  struct rtnl_mall *mall;
87 
88  if (!(mall = rtnl_tc_data_peek(TC_CAST(cls))))
89  return -NLE_INVAL;
90 
91  if (!(mall->m_mask & MALL_ATTR_FLAGS))
92  return -NLE_INVAL;
93 
94  *flags = mall->m_flags;
95  return 0;
96 }
97 
98 int rtnl_mall_append_action(struct rtnl_cls *cls, struct rtnl_act *act)
99 {
100  struct rtnl_mall *mall;
101  int err;
102 
103  if (!act)
104  return 0;
105 
106  if (!(mall = rtnl_tc_data(TC_CAST(cls))))
107  return -NLE_NOMEM;
108 
109  mall->m_mask |= MALL_ATTR_ACTION;
110  err = rtnl_act_append(&mall->m_act, act);
111  if (err)
112  return err;
113 
114  rtnl_act_get(act);
115  return 0;
116 }
117 
118 struct rtnl_act *rtnl_mall_get_first_action(struct rtnl_cls *cls)
119 {
120  struct rtnl_mall *mall;
121  struct rtnl_act *act;
122 
123  if (!(mall = rtnl_tc_data(TC_CAST(cls))))
124  return NULL;
125 
126  if (!(mall->m_mask & MALL_ATTR_ACTION))
127  return NULL;
128 
129  act = mall->m_act;
130  rtnl_act_get(act);
131 
132  return act;
133 }
134 
135 int rtnl_mall_del_action(struct rtnl_cls *cls, struct rtnl_act *act)
136 {
137  struct rtnl_mall *mall;
138  int ret;
139 
140  if (!act)
141  return 0;
142 
143  if (!(mall = rtnl_tc_data(TC_CAST(cls))))
144  return -NLE_NOMEM;
145 
146  if (!(mall->m_mask & MALL_ATTR_ACTION))
147  return -NLE_INVAL;
148 
149  ret = rtnl_act_remove(&mall->m_act, act);
150  if (ret < 0)
151  return ret;
152 
153  rtnl_act_put(act);
154 
155  return 0;
156 }
157 
158 /** @} */
159 
160 static void mall_free_data(struct rtnl_tc *tc, void *data)
161 {
162  struct rtnl_mall *mall = data;
163 
164  if (mall->m_act)
165  rtnl_act_put_all(&mall->m_act);
166 }
167 
168 static int mall_msg_parser(struct rtnl_tc *tc, void *data)
169 {
170  struct rtnl_mall *mall = data;
171  struct nlattr *tb[TCA_MATCHALL_MAX + 1];
172  int err;
173 
174  err = tca_parse(tb, TCA_MATCHALL_MAX, tc, mall_policy);
175  if (err < 0)
176  return err;
177 
178  if (tb[TCA_MATCHALL_CLASSID]) {
179  mall->m_classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
180  mall->m_mask |= MALL_ATTR_CLASSID;
181  }
182 
183  if (tb[TCA_MATCHALL_FLAGS]) {
184  mall->m_flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
185  mall->m_mask |= MALL_ATTR_FLAGS;
186  }
187 
188  if (tb[TCA_MATCHALL_ACT]) {
189  mall->m_mask |= MALL_ATTR_ACTION;
190  err = rtnl_act_parse(&mall->m_act, tb[TCA_MATCHALL_ACT]);
191  if (err)
192  return err;
193  }
194 
195  return 0;
196 }
197 
198 static int mall_msg_fill(struct rtnl_tc *tc, void *data, struct nl_msg *msg)
199 {
200  struct rtnl_mall *mall = data;
201 
202  if (!mall)
203  return 0;
204 
205  if (mall->m_mask & MALL_ATTR_CLASSID)
206  NLA_PUT_U32(msg, TCA_MATCHALL_CLASSID, mall->m_classid);
207 
208  if (mall->m_mask & MALL_ATTR_FLAGS)
209  NLA_PUT_U32(msg, TCA_MATCHALL_FLAGS, mall->m_flags);
210 
211  if (mall->m_mask & MALL_ATTR_ACTION) {
212  int err;
213 
214  err = rtnl_act_fill(msg, TCA_MATCHALL_ACT, mall->m_act);
215  if (err)
216  return err;
217  }
218 
219  return 0;
220 
221  nla_put_failure:
222  return -NLE_NOMEM;
223 }
224 
225 static int mall_clone(void *_dst, void *_src)
226 {
227  struct rtnl_mall *dst = _dst, *src = _src;
228  struct rtnl_act *next, *new;
229  int err;
230 
231  if (src->m_act) {
232  if (!(dst->m_act = rtnl_act_alloc()))
233  return -NLE_NOMEM;
234 
235  /* action nl list next and prev pointers must be updated */
236  nl_init_list_head(&dst->m_act->ce_list);
237 
238  memcpy(dst->m_act, src->m_act, sizeof(struct rtnl_act));
239  next = rtnl_act_next(src->m_act);
240  while (next) {
241  new = (struct rtnl_act *) nl_object_clone((struct nl_object *) next);
242  if (!new)
243  return -NLE_NOMEM;
244 
245  err = rtnl_act_append(&dst->m_act, new);
246  if (err < 0)
247  return err;
248 
249  next = rtnl_act_next(next);
250  }
251  }
252 
253  return 0;
254 }
255 
256 static void mall_dump_line(struct rtnl_tc *tc, void *data,
257  struct nl_dump_params *p)
258 {
259  struct rtnl_mall *mall = data;
260  char buf[32];
261 
262  if (!mall)
263  return;
264 
265  if (mall->m_mask & MALL_ATTR_CLASSID)
266  nl_dump(p, " target %s",
267  rtnl_tc_handle2str(mall->m_classid, buf, sizeof(buf)));
268 }
269 
270 static void mall_dump_details(struct rtnl_tc *tc, void *data,
271  struct nl_dump_params *p)
272 {
273  struct rtnl_mall *mall = data;
274 
275  if (!mall)
276  return;
277 
278  nl_dump(p, "no details for match-all");
279 }
280 
281 static struct rtnl_tc_ops mall_ops = {
282  .to_kind = "matchall",
283  .to_type = RTNL_TC_TYPE_CLS,
284  .to_size = sizeof(struct rtnl_mall),
285  .to_msg_parser = mall_msg_parser,
286  .to_free_data = mall_free_data,
287  .to_clone = mall_clone,
288  .to_msg_fill = mall_msg_fill,
289  .to_dump = {
290  [NL_DUMP_LINE] = mall_dump_line,
291  [NL_DUMP_DETAILS] = mall_dump_details,
292  },
293 };
294 
295 static void __init mall_init(void)
296 {
297  rtnl_tc_register(&mall_ops);
298 }
299 
300 static void __exit mall_exit(void)
301 {
302  rtnl_tc_unregister(&mall_ops);
303 }
304 
305 /** @} */
Dump object briefly on one line.
Definition: types.h:22
int rtnl_tc_register(struct rtnl_tc_ops *ops)
Register a traffic control module.
Definition: tc.c:1021
Attribute validation policy.
Definition: attr.h:69
uint32_t nla_get_u32(const struct nlattr *nla)
Return payload of 32 bit integer attribute.
Definition: attr.c:707
Dump all attributes but no statistics.
Definition: types.h:23
void rtnl_tc_unregister(struct rtnl_tc_ops *ops)
Unregister a traffic control module.
Definition: tc.c:1055
#define TC_CAST(ptr)
Macro to cast qdisc/class/classifier to tc object.
Definition: tc.h:56
#define NLA_PUT_U32(msg, attrtype, value)
Add 32 bit integer attribute to netlink message.
Definition: attr.h:236
void * rtnl_tc_data(struct rtnl_tc *tc)
Return pointer to private data of traffic control object.
Definition: tc.c:1082
uint16_t type
Type of attribute or NLA_UNSPEC.
Definition: attr.h:71
32 bit integer
Definition: attr.h:43
char * rtnl_tc_handle2str(uint32_t handle, char *buf, size_t len)
Convert a traffic control handle to a character string (Reentrant).
Definition: classid.c:110
Dumping parameters.
Definition: types.h:33
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition: utils.c:962
void * rtnl_tc_data_peek(struct rtnl_tc *tc)
Returns the private data of the traffic control object.
Definition: tc.c:1068
struct nl_object * nl_object_clone(struct nl_object *obj)
Allocate a new object and copy all data from an existing object.
Definition: object.c:111