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
__get_vlan_tinfo_size(void)21 static size_t __get_vlan_tinfo_size(void)
22 {
23 return nla_total_size(0) + /* nest IFLA_BRIDGE_VLAN_TUNNEL_INFO */
24 nla_total_size(sizeof(u32)) + /* IFLA_BRIDGE_VLAN_TUNNEL_ID */
25 nla_total_size(sizeof(u16)) + /* IFLA_BRIDGE_VLAN_TUNNEL_VID */
26 nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
27 }
28
vlan_tunid_inrange(const struct net_bridge_vlan * v_curr,const struct net_bridge_vlan * v_last)29 bool 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(v_curr->tinfo.tunnel_id);
33 __be32 tunid_last = tunnel_id_to_key32(v_last->tinfo.tunnel_id);
34
35 return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_last)) == 1;
36 }
37
__get_num_vlan_tunnel_infos(struct net_bridge_vlan_group * vg)38 static 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, 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 }
61 initvars:
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
br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group * vg)76 int 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
br_fill_vlan_tinfo(struct sk_buff * skb,u16 vid,__be64 tunnel_id,u16 flags)90 static 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(tunnel_id);
94 struct nlattr *tmap;
95
96 tmap = nla_nest_start_noflag(skb, IFLA_BRIDGE_VLAN_TUNNEL_INFO);
97 if (!tmap)
98 return -EMSGSIZE;
99 if (nla_put_u32(skb, IFLA_BRIDGE_VLAN_TUNNEL_ID,
100 be32_to_cpu(tid)))
101 goto nla_put_failure;
102 if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_VID,
103 vid))
104 goto nla_put_failure;
105 if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
106 flags))
107 goto nla_put_failure;
108 nla_nest_end(skb, tmap);
109
110 return 0;
111
112 nla_put_failure:
113 nla_nest_cancel(skb, tmap);
114
115 return -EMSGSIZE;
116 }
117
br_fill_vlan_tinfo_range(struct sk_buff * skb,struct net_bridge_vlan * vtbegin,struct net_bridge_vlan * vtend)118 static 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, vtbegin->vid,
127 vtbegin->tinfo.tunnel_id,
128 BRIDGE_VLAN_INFO_RANGE_BEGIN);
129 if (err)
130 return err;
131
132 err = br_fill_vlan_tinfo(skb, vtend->vid,
133 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, vtbegin->vid,
139 vtbegin->tinfo.tunnel_id,
140 0);
141 if (err)
142 return err;
143 }
144
145 return 0;
146 }
147
br_fill_vlan_tunnel_info(struct sk_buff * skb,struct net_bridge_vlan_group * vg)148 int 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, 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 }
176 initvars:
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
190 static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1] = {
191 [IFLA_BRIDGE_VLAN_TUNNEL_ID] = { .type = NLA_U32 },
192 [IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
193 [IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
194 };
195
br_vlan_tunnel_info(const struct net_bridge_port * p,int cmd,u16 vid,u32 tun_id,bool * changed)196 int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
197 u16 vid, u32 tun_id, bool *changed)
198 {
199 int err = 0;
200
201 if (!p)
202 return -EINVAL;
203
204 switch (cmd) {
205 case RTM_SETLINK:
206 err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
207 if (!err)
208 *changed = true;
209 break;
210 case RTM_DELLINK:
211 if (!nbp_vlan_tunnel_info_delete(p, vid))
212 *changed = true;
213 break;
214 }
215
216 return err;
217 }
218
br_parse_vlan_tunnel_info(struct nlattr * attr,struct vtunnel_info * tinfo)219 int br_parse_vlan_tunnel_info(struct nlattr *attr,
220 struct vtunnel_info *tinfo)
221 {
222 struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
223 u32 tun_id;
224 u16 vid, flags = 0;
225 int err;
226
227 memset(tinfo, 0, sizeof(*tinfo));
228
229 err = nla_parse_nested_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
230 attr, vlan_tunnel_policy, NULL);
231 if (err < 0)
232 return err;
233
234 if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
235 !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
236 return -EINVAL;
237
238 tun_id = nla_get_u32(tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
239 vid = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
240 if (vid >= VLAN_VID_MASK)
241 return -ERANGE;
242
243 if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
244 flags = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);
245
246 tinfo->tunid = tun_id;
247 tinfo->vid = vid;
248 tinfo->flags = flags;
249
250 return 0;
251 }
252
253 /* send a notification if v_curr can't enter the range and start a new one */
__vlan_tunnel_handle_range(const struct net_bridge_port * p,struct net_bridge_vlan ** v_start,struct net_bridge_vlan ** v_end,int v_curr,bool curr_change)254 static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
255 struct net_bridge_vlan **v_start,
256 struct net_bridge_vlan **v_end,
257 int v_curr, bool curr_change)
258 {
259 struct net_bridge_vlan_group *vg;
260 struct net_bridge_vlan *v;
261
262 vg = nbp_vlan_group(p);
263 if (!vg)
264 return;
265
266 v = br_vlan_find(vg, v_curr);
267
268 if (!*v_start)
269 goto out_init;
270
271 if (v && curr_change && br_vlan_can_enter_range(v, *v_end)) {
272 *v_end = v;
273 return;
274 }
275
276 br_vlan_notify(p->br, p, (*v_start)->vid, (*v_end)->vid, RTM_NEWVLAN);
277 out_init:
278 /* we start a range only if there are any changes to notify about */
279 *v_start = curr_change ? v : NULL;
280 *v_end = *v_start;
281 }
282
br_process_vlan_tunnel_info(const struct net_bridge * br,const struct net_bridge_port * p,int cmd,struct vtunnel_info * tinfo_curr,struct vtunnel_info * tinfo_last,bool * changed)283 int br_process_vlan_tunnel_info(const struct net_bridge *br,
284 const struct net_bridge_port *p, int cmd,
285 struct vtunnel_info *tinfo_curr,
286 struct vtunnel_info *tinfo_last,
287 bool *changed)
288 {
289 int err;
290
291 if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
292 if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
293 return -EINVAL;
294 memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
295 } else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
296 struct net_bridge_vlan *v_start = NULL, *v_end = NULL;
297 int t, v;
298
299 if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
300 return -EINVAL;
301 if ((tinfo_curr->vid - tinfo_last->vid) !=
302 (tinfo_curr->tunid - tinfo_last->tunid))
303 return -EINVAL;
304 t = tinfo_last->tunid;
305 for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
306 bool curr_change = false;
307
308 err = br_vlan_tunnel_info(p, cmd, v, t, &curr_change);
309 if (err)
310 break;
311 t++;
312
313 if (curr_change)
314 *changed = curr_change;
315 __vlan_tunnel_handle_range(p, &v_start, &v_end, v,
316 curr_change);
317 }
318 if (v_start && v_end)
319 br_vlan_notify(br, p, v_start->vid, v_end->vid,
320 RTM_NEWVLAN);
321 if (err)
322 return err;
323
324 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
325 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
326 } else {
327 if (tinfo_last->flags)
328 return -EINVAL;
329 err = br_vlan_tunnel_info(p, cmd, tinfo_curr->vid,
330 tinfo_curr->tunid, changed);
331 if (err)
332 return err;
333 br_vlan_notify(br, p, tinfo_curr->vid, 0, RTM_NEWVLAN);
334 memset(tinfo_last, 0, sizeof(struct vtunnel_info));
335 memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
336 }
337
338 return 0;
339 }
340