1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Bridge per vlan tunnel port dst_metadata netlink control interface
4 *
5 * Authors:
6 * Roopa Prabhu <roopa@cumulusnetworks.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/slab.h>
11#include <linux/etherdevice.h>
12#include <net/rtnetlink.h>
13#include <net/net_namespace.h>
14#include <net/sock.h>
15#include <uapi/linux/if_bridge.h>
16#include <net/dst_metadata.h>
17
18#include "br_private.h"
19#include "br_private_tunnel.h"
20
21static size_t __get_vlan_tinfo_size(void)
22{
23 return nla_total_size(payload: 0) + /* nest IFLA_BRIDGE_VLAN_TUNNEL_INFO */
24 nla_total_size(payload: sizeof(u32)) + /* IFLA_BRIDGE_VLAN_TUNNEL_ID */
25 nla_total_size(payload: sizeof(u16)) + /* IFLA_BRIDGE_VLAN_TUNNEL_VID */
26 nla_total_size(payload: sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
27}
28
29bool vlan_tunid_inrange(const struct net_bridge_vlan *v_curr,
30 const struct net_bridge_vlan *v_last)
31{
32 __be32 tunid_curr = tunnel_id_to_key32(tun_id: v_curr->tinfo.tunnel_id);
33 __be32 tunid_last = tunnel_id_to_key32(tun_id: v_last->tinfo.tunnel_id);
34
35 return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_last)) == 1;
36}
37
38static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
39{
40 struct net_bridge_vlan *v, *vtbegin = NULL, *vtend = NULL;
41 int num_tinfos = 0;
42
43 /* Count number of vlan infos */
44 list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
45 /* only a context, bridge vlan not activated */
46 if (!br_vlan_should_use(v) || !v->tinfo.tunnel_id)
47 continue;
48
49 if (!vtbegin) {
50 goto initvars;
51 } else if ((v->vid - vtend->vid) == 1 &&
52 vlan_tunid_inrange(v_curr: v, v_last: vtend)) {
53 vtend = v;
54 continue;
55 } else {
56 if ((vtend->vid - vtbegin->vid) > 0)
57 num_tinfos += 2;
58 else
59 num_tinfos += 1;
60 }
61initvars:
62 vtbegin = v;
63 vtend = v;
64 }
65
66 if (vtbegin && vtend) {
67 if ((vtend->vid - vtbegin->vid) > 0)
68 num_tinfos += 2;
69 else
70 num_tinfos += 1;
71 }
72
73 return num_tinfos;
74}
75
76int br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group *vg)
77{
78 int num_tinfos;
79
80 if (!vg)
81 return 0;
82
83 rcu_read_lock();
84 num_tinfos = __get_num_vlan_tunnel_infos(vg);
85 rcu_read_unlock();
86
87 return num_tinfos * __get_vlan_tinfo_size();
88}
89
90static int br_fill_vlan_tinfo(struct sk_buff *skb, u16 vid,
91 __be64 tunnel_id, u16 flags)
92{
93 __be32 tid = tunnel_id_to_key32(tun_id: tunnel_id);
94 struct nlattr *tmap;
95
96 tmap = nla_nest_start_noflag(skb, attrtype: IFLA_BRIDGE_VLAN_TUNNEL_INFO);
97 if (!tmap)
98 return -EMSGSIZE;
99 if (nla_put_u32(skb, attrtype: IFLA_BRIDGE_VLAN_TUNNEL_ID,
100 be32_to_cpu(tid)))
101 goto nla_put_failure;
102 if (nla_put_u16(skb, attrtype: IFLA_BRIDGE_VLAN_TUNNEL_VID,
103 value: vid))
104 goto nla_put_failure;
105 if (nla_put_u16(skb, attrtype: IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
106 value: flags))
107 goto nla_put_failure;
108 nla_nest_end(skb, start: tmap);
109
110 return 0;
111
112nla_put_failure:
113 nla_nest_cancel(skb, start: tmap);
114
115 return -EMSGSIZE;
116}
117
118static int br_fill_vlan_tinfo_range(struct sk_buff *skb,
119 struct net_bridge_vlan *vtbegin,
120 struct net_bridge_vlan *vtend)
121{
122 int err;
123
124 if (vtend && (vtend->vid - vtbegin->vid) > 0) {
125 /* add range to skb */
126 err = br_fill_vlan_tinfo(skb, vid: vtbegin->vid,
127 tunnel_id: vtbegin->tinfo.tunnel_id,
128 BRIDGE_VLAN_INFO_RANGE_BEGIN);
129 if (err)
130 return err;
131
132 err = br_fill_vlan_tinfo(skb, vid: vtend->vid,
133 tunnel_id: vtend->tinfo.tunnel_id,
134 BRIDGE_VLAN_INFO_RANGE_END);
135 if (err)
136 return err;
137 } else {
138 err = br_fill_vlan_tinfo(skb, vid: vtbegin->vid,
139 tunnel_id: vtbegin->tinfo.tunnel_id,
140 flags: 0);
141 if (err)
142 return err;
143 }
144
145 return 0;
146}
147
148int br_fill_vlan_tunnel_info(struct sk_buff *skb,
149 struct net_bridge_vlan_group *vg)
150{
151 struct net_bridge_vlan *vtbegin = NULL;
152 struct net_bridge_vlan *vtend = NULL;
153 struct net_bridge_vlan *v;
154 int err;
155
156 /* Count number of vlan infos */
157 list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
158 /* only a context, bridge vlan not activated */
159 if (!br_vlan_should_use(v))
160 continue;
161
162 if (!v->tinfo.tunnel_dst)
163 continue;
164
165 if (!vtbegin) {
166 goto initvars;
167 } else if ((v->vid - vtend->vid) == 1 &&
168 vlan_tunid_inrange(v_curr: v, v_last: vtend)) {
169 vtend = v;
170 continue;
171 } else {
172 err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
173 if (err)
174 return err;
175 }
176initvars:
177 vtbegin = v;
178 vtend = v;
179 }
180
181 if (vtbegin) {
182 err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
183 if (err)
184 return err;
185 }
186
187 return 0;
188}
189
190static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1] = {
191 [IFLA_BRIDGE_VLAN_TUNNEL_UNSPEC] = {
192 .strict_start_type = IFLA_BRIDGE_VLAN_TUNNEL_FLAGS + 1
193 },
194 [IFLA_BRIDGE_VLAN_TUNNEL_ID] = { .type = NLA_U32 },
195 [IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
196 [IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
197};
198
199int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
200 u16 vid, u32 tun_id, bool *changed)
201{
202 int err = 0;
203
204 if (!p)
205 return -EINVAL;
206
207 switch (cmd) {
208 case RTM_SETLINK:
209 err = nbp_vlan_tunnel_info_add(port: p, vid, tun_id);
210 if (!err)
211 *changed = true;
212 break;
213 case RTM_DELLINK:
214 if (!nbp_vlan_tunnel_info_delete(port: p, vid))
215 *changed = true;
216 break;
217 }
218
219 return err;
220}
221
222int br_parse_vlan_tunnel_info(struct nlattr *attr,
223 struct vtunnel_info *tinfo)
224{
225 struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
226 u32 tun_id;
227 u16 vid, flags = 0;
228 int err;
229
230 memset(tinfo, 0, sizeof(*tinfo));
231
232 err = nla_parse_nested_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
233 nla: attr, policy: vlan_tunnel_policy, NULL);
234 if (err < 0)
235 return err;
236
237 if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
238 !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
239 return -EINVAL;
240
241 tun_id = nla_get_u32(nla: tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
242 vid = nla_get_u16(nla: tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
243 if (vid >= VLAN_VID_MASK)
244 return -ERANGE;
245
246 if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
247 flags = nla_get_u16(nla: tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);
248
249 tinfo->tunid = tun_id;
250 tinfo->vid = vid;
251 tinfo->flags = flags;
252
253 return 0;
254}
255
256/* send a notification if v_curr can't enter the range and start a new one */
257static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
258 struct net_bridge_vlan **v_start,
259 struct net_bridge_vlan **v_end,
260 int v_curr, bool curr_change)
261{
262 struct net_bridge_vlan_group *vg;
263 struct net_bridge_vlan *v;
264
265 vg = nbp_vlan_group(p);
266 if (!vg)
267 return;
268
269 v = br_vlan_find(vg, vid: v_curr);
270
271 if (!*v_start)
272 goto out_init;
273
274 if (v && curr_change && br_vlan_can_enter_range(v_curr: v, range_end: *v_end)) {
275 *v_end = v;
276 return;
277 }
278
279 br_vlan_notify(br: p->br, p, vid: (*v_start)->vid, vid_range: (*v_end)->vid, cmd: RTM_NEWVLAN);
280out_init:
281 /* we start a range only if there are any changes to notify about */
282 *v_start = curr_change ? v : NULL;
283 *v_end = *v_start;
284}
285
286int br_process_vlan_tunnel_info(const struct net_bridge *br,
287 const struct net_bridge_port *p, int cmd,
288 struct vtunnel_info *tinfo_curr,
289 struct vtunnel_info *tinfo_last,
290 bool *changed)
291{
292 int err;
293
294 if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
295 if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
296 return -EINVAL;
297 memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
298 } else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
299 struct net_bridge_vlan *v_start = NULL, *v_end = NULL;
300 int t, v;
301
302 if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
303 return -EINVAL;
304 if ((tinfo_curr->vid - tinfo_last->vid) !=
305 (tinfo_curr->tunid - tinfo_last->tunid))
306 return -EINVAL;
307 t = tinfo_last->tunid;
308 for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
309 bool curr_change = false;
310
311 err = br_vlan_tunnel_info(p, cmd, vid: v, tun_id: t, changed: &curr_change);
312 if (err)
313 break;
314 t++;
315
316 if (curr_change)
317 *changed = curr_change;
318 __vlan_tunnel_handle_range(p, v_start: &v_start, v_end: &v_end, v_curr: v,
319 curr_change);
320 }
321 if (v_start && v_end)
322 br_vlan_notify(br, p, vid: v_start->vid, vid_range: v_end->vid,
323 cmd: RTM_NEWVLAN);
324 if (err)
325 return err;
326
327 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
328 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
329 } else {
330 if (tinfo_last->flags)
331 return -EINVAL;
332 err = br_vlan_tunnel_info(p, cmd, vid: tinfo_curr->vid,
333 tun_id: tinfo_curr->tunid, changed);
334 if (err)
335 return err;
336 br_vlan_notify(br, p, vid: tinfo_curr->vid, vid_range: 0, cmd: RTM_NEWVLAN);
337 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
338 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
339 }
340
341 return 0;
342}
343

source code of linux/net/bridge/br_netlink_tunnel.c