1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2015 Cumulus Networks. All rights reserved.
4 * Copyright (c) 2015 David Ahern <[email protected]>
5 */
6
7 /**
8 * @ingroup link
9 * @defgroup vrf VRF
10 * Virtual Routing and Forwarding link module
11 *
12 * @details
13 * \b Link Type Name: "vrf"
14 *
15 * @route_doc{link_vrf, VRF Documentation}
16 *
17 * @{
18 */
19
20 #include "nl-default.h"
21
22 #include <linux/if_link.h>
23 #include <linux/rtnetlink.h>
24
25 #include <netlink/netlink.h>
26 #include <netlink/attr.h>
27 #include <netlink/utils.h>
28 #include <netlink/object.h>
29 #include <netlink/route/rtnl.h>
30 #include <netlink/route/link/vrf.h>
31
32 #include "nl-route.h"
33 #include "link-api.h"
34
35 #define VRF_TABLE_ID_MAX RT_TABLE_MAX
36
37 /** @cond SKIP */
38 #define VRF_HAS_TABLE_ID (1<<0)
39
40 struct vrf_info {
41 uint32_t table_id;
42 uint32_t vi_mask;
43 };
44
45 /** @endcond */
46
47 static struct nla_policy vrf_policy[IFLA_VRF_MAX + 1] = {
48 [IFLA_VRF_TABLE] = { .type = NLA_U32 },
49 };
50
vrf_alloc(struct rtnl_link * link)51 static int vrf_alloc(struct rtnl_link *link)
52 {
53 struct vrf_info *vi;
54
55 if (link->l_info) {
56 memset(link->l_info, 0, sizeof (*vi));
57 return 0;
58 }
59
60 if ((vi = calloc(1, sizeof(*vi))) == NULL)
61 return -NLE_NOMEM;
62
63 link->l_info = vi;
64
65 return 0;
66 }
67
vrf_parse(struct rtnl_link * link,struct nlattr * data,struct nlattr * xstats)68 static int vrf_parse(struct rtnl_link *link, struct nlattr *data,
69 struct nlattr *xstats)
70 {
71 struct nlattr *tb[IFLA_VRF_MAX+1];
72 struct vrf_info *vi;
73 int err;
74
75 NL_DBG(3, "Parsing VRF link info");
76
77 if ((err = nla_parse_nested(tb, IFLA_VRF_MAX, data, vrf_policy)) < 0)
78 goto errout;
79
80 if ((err = vrf_alloc(link)) < 0)
81 goto errout;
82
83 vi = link->l_info;
84
85 if (tb[IFLA_VRF_TABLE]) {
86 vi->table_id = nla_get_u32(tb[IFLA_VRF_TABLE]);
87 vi->vi_mask |= VRF_HAS_TABLE_ID;
88 }
89
90 err = 0;
91
92 errout:
93 return err;
94 }
95
vrf_free(struct rtnl_link * link)96 static void vrf_free(struct rtnl_link *link)
97 {
98 free(link->l_info);
99 link->l_info = NULL;
100 }
101
vrf_clone(struct rtnl_link * dst,struct rtnl_link * src)102 static int vrf_clone(struct rtnl_link *dst, struct rtnl_link *src)
103 {
104 struct vrf_info *vdst, *vsrc = src->l_info;
105 int err;
106
107 dst->l_info = NULL;
108 if ((err = rtnl_link_set_type(dst, "vrf")) < 0)
109 return err;
110 vdst = dst->l_info;
111
112 BUG_ON(!vdst || !vsrc);
113
114 memcpy(vdst, vsrc, sizeof(struct vrf_info));
115
116 return 0;
117 }
118
vrf_put_attrs(struct nl_msg * msg,struct rtnl_link * link)119 static int vrf_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
120 {
121 struct vrf_info *vi = link->l_info;
122 struct nlattr *data;
123
124 if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
125 return -NLE_NOMEM;
126
127 if (vi->vi_mask & VRF_HAS_TABLE_ID) {
128 NLA_PUT_U32(msg, IFLA_VRF_TABLE, vi->table_id);
129 }
130
131 nla_nest_end(msg, data);
132
133 nla_put_failure:
134
135 return 0;
136 }
137
vrf_dump(struct rtnl_link * link,struct nl_dump_params * p)138 static void vrf_dump(struct rtnl_link *link, struct nl_dump_params *p)
139 {
140 struct vrf_info *vi = link->l_info;
141
142 if (vi->vi_mask & VRF_HAS_TABLE_ID) {
143 nl_dump(p, "table-id %u", vi->table_id);
144 }
145 }
146
147 static struct rtnl_link_info_ops vrf_info_ops = {
148 .io_name = "vrf",
149 .io_alloc = vrf_alloc,
150 .io_parse = vrf_parse,
151 .io_dump = {
152 [NL_DUMP_LINE] = vrf_dump,
153 [NL_DUMP_DETAILS] = vrf_dump,
154 },
155 .io_clone = vrf_clone,
156 .io_put_attrs = vrf_put_attrs,
157 .io_free = vrf_free,
158 };
159
160 /** @cond SKIP */
161 #define IS_VRF_LINK_ASSERT(link) \
162 if ((link)->l_info_ops != &vrf_info_ops) { \
163 APPBUG("Link is not a VRF link. set type \"vrf\" first."); \
164 return -NLE_OPNOTSUPP; \
165 }
166 /** @endcond */
167
168 /**
169 * @name VRF Object
170 * @{
171 */
172
173 /**
174 * Allocate link object of type VRF
175 *
176 * @return Allocated link object or NULL.
177 */
rtnl_link_vrf_alloc(void)178 struct rtnl_link *rtnl_link_vrf_alloc(void)
179 {
180 struct rtnl_link *link;
181
182 if (!(link = rtnl_link_alloc()))
183 return NULL;
184
185 if (rtnl_link_set_type(link, "vrf") < 0) {
186 rtnl_link_put(link);
187 return NULL;
188 }
189
190 return link;
191 }
192
193 /**
194 * Check if link is a VRF link
195 * @arg link Link object
196 *
197 * @return True if link is a VRF link, otherwise false is returned.
198 */
rtnl_link_is_vrf(struct rtnl_link * link)199 int rtnl_link_is_vrf(struct rtnl_link *link)
200 {
201 return link->l_info_ops && !strcmp(link->l_info_ops->io_name, "vrf");
202 }
203
204 /**
205 * Get VRF table id
206 * @arg link Link object
207 * @arg id Pointer to store table identifier
208 *
209 * @return 0 on success or a negative error code
210 */
rtnl_link_vrf_get_tableid(struct rtnl_link * link,uint32_t * id)211 int rtnl_link_vrf_get_tableid(struct rtnl_link *link, uint32_t *id)
212 {
213 struct vrf_info *vi = link->l_info;
214
215 IS_VRF_LINK_ASSERT(link);
216 if(!id)
217 return -NLE_INVAL;
218
219 if (vi->vi_mask & VRF_HAS_TABLE_ID)
220 *id = vi->table_id;
221 else
222 return -NLE_AGAIN;
223
224 return 0;
225 }
226
227 /**
228 * Set VRF table id
229 * @arg link Link object
230 * @arg id Table identifier associated with VRF link
231 *
232 * @return 0 on success or a negative error code
233 */
rtnl_link_vrf_set_tableid(struct rtnl_link * link,uint32_t id)234 int rtnl_link_vrf_set_tableid(struct rtnl_link *link, uint32_t id)
235 {
236 struct vrf_info *vi = link->l_info;
237
238 IS_VRF_LINK_ASSERT(link);
239
240 _NL_STATIC_ASSERT(VRF_TABLE_ID_MAX == UINT32_MAX);
241
242 vi->table_id = id;
243 vi->vi_mask |= VRF_HAS_TABLE_ID;
244
245 return 0;
246 }
247
248 /** @} */
249
vrf_init(void)250 static void _nl_init vrf_init(void)
251 {
252 rtnl_link_register_info(&vrf_info_ops);
253 }
254
vrf_exit(void)255 static void _nl_exit vrf_exit(void)
256 {
257 rtnl_link_unregister_info(&vrf_info_ops);
258 }
259
260 /** @} */
261