1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Bridge per vlan tunnel port dst_metadata handling code
4 *
5 * Authors:
6 * Roopa Prabhu <roopa@cumulusnetworks.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/rtnetlink.h>
12#include <linux/slab.h>
13#include <net/switchdev.h>
14#include <net/dst_metadata.h>
15
16#include "br_private.h"
17#include "br_private_tunnel.h"
18
19static inline int br_vlan_tunid_cmp(struct rhashtable_compare_arg *arg,
20 const void *ptr)
21{
22 const struct net_bridge_vlan *vle = ptr;
23 __be64 tunid = *(__be64 *)arg->key;
24
25 return vle->tinfo.tunnel_id != tunid;
26}
27
28static const struct rhashtable_params br_vlan_tunnel_rht_params = {
29 .head_offset = offsetof(struct net_bridge_vlan, tnode),
30 .key_offset = offsetof(struct net_bridge_vlan, tinfo.tunnel_id),
31 .key_len = sizeof(__be64),
32 .nelem_hint = 3,
33 .obj_cmpfn = br_vlan_tunid_cmp,
34 .automatic_shrinking = true,
35};
36
37static struct net_bridge_vlan *br_vlan_tunnel_lookup(struct rhashtable *tbl,
38 __be64 tunnel_id)
39{
40 return rhashtable_lookup_fast(ht: tbl, key: &tunnel_id,
41 params: br_vlan_tunnel_rht_params);
42}
43
44static void vlan_tunnel_info_release(struct net_bridge_vlan *vlan)
45{
46 struct metadata_dst *tdst = rtnl_dereference(vlan->tinfo.tunnel_dst);
47
48 WRITE_ONCE(vlan->tinfo.tunnel_id, 0);
49 RCU_INIT_POINTER(vlan->tinfo.tunnel_dst, NULL);
50 dst_release(dst: &tdst->dst);
51}
52
53void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
54 struct net_bridge_vlan *vlan)
55{
56 if (!rcu_access_pointer(vlan->tinfo.tunnel_dst))
57 return;
58 rhashtable_remove_fast(ht: &vg->tunnel_hash, obj: &vlan->tnode,
59 params: br_vlan_tunnel_rht_params);
60 vlan_tunnel_info_release(vlan);
61}
62
63static int __vlan_tunnel_info_add(struct net_bridge_vlan_group *vg,
64 struct net_bridge_vlan *vlan, u32 tun_id)
65{
66 struct metadata_dst *metadata = rtnl_dereference(vlan->tinfo.tunnel_dst);
67 __be64 key = key32_to_tunnel_id(cpu_to_be32(tun_id));
68 int err;
69
70 if (metadata)
71 return -EEXIST;
72
73 metadata = __ip_tun_set_dst(saddr: 0, daddr: 0, tos: 0, ttl: 0, tp_dst: 0, TUNNEL_KEY,
74 tunnel_id: key, md_size: 0);
75 if (!metadata)
76 return -EINVAL;
77
78 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_BRIDGE;
79 rcu_assign_pointer(vlan->tinfo.tunnel_dst, metadata);
80 WRITE_ONCE(vlan->tinfo.tunnel_id, key);
81
82 err = rhashtable_lookup_insert_fast(ht: &vg->tunnel_hash, obj: &vlan->tnode,
83 params: br_vlan_tunnel_rht_params);
84 if (err)
85 goto out;
86
87 return 0;
88out:
89 vlan_tunnel_info_release(vlan);
90
91 return err;
92}
93
94/* Must be protected by RTNL.
95 * Must be called with vid in range from 1 to 4094 inclusive.
96 */
97int nbp_vlan_tunnel_info_add(const struct net_bridge_port *port, u16 vid,
98 u32 tun_id)
99{
100 struct net_bridge_vlan_group *vg;
101 struct net_bridge_vlan *vlan;
102
103 ASSERT_RTNL();
104
105 vg = nbp_vlan_group(p: port);
106 vlan = br_vlan_find(vg, vid);
107 if (!vlan)
108 return -EINVAL;
109
110 return __vlan_tunnel_info_add(vg, vlan, tun_id);
111}
112
113/* Must be protected by RTNL.
114 * Must be called with vid in range from 1 to 4094 inclusive.
115 */
116int nbp_vlan_tunnel_info_delete(const struct net_bridge_port *port, u16 vid)
117{
118 struct net_bridge_vlan_group *vg;
119 struct net_bridge_vlan *v;
120
121 ASSERT_RTNL();
122
123 vg = nbp_vlan_group(p: port);
124 v = br_vlan_find(vg, vid);
125 if (!v)
126 return -ENOENT;
127
128 vlan_tunnel_info_del(vg, vlan: v);
129
130 return 0;
131}
132
133static void __vlan_tunnel_info_flush(struct net_bridge_vlan_group *vg)
134{
135 struct net_bridge_vlan *vlan, *tmp;
136
137 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
138 vlan_tunnel_info_del(vg, vlan);
139}
140
141void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port)
142{
143 struct net_bridge_vlan_group *vg;
144
145 ASSERT_RTNL();
146
147 vg = nbp_vlan_group(p: port);
148 __vlan_tunnel_info_flush(vg);
149}
150
151int vlan_tunnel_init(struct net_bridge_vlan_group *vg)
152{
153 return rhashtable_init(ht: &vg->tunnel_hash, params: &br_vlan_tunnel_rht_params);
154}
155
156void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg)
157{
158 rhashtable_destroy(ht: &vg->tunnel_hash);
159}
160
161void br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
162 struct net_bridge_port *p,
163 struct net_bridge_vlan_group *vg)
164{
165 struct ip_tunnel_info *tinfo = skb_tunnel_info(skb);
166 struct net_bridge_vlan *vlan;
167
168 if (!vg || !tinfo)
169 return;
170
171 /* if already tagged, ignore */
172 if (skb_vlan_tagged(skb))
173 return;
174
175 /* lookup vid, given tunnel id */
176 vlan = br_vlan_tunnel_lookup(tbl: &vg->tunnel_hash, tunnel_id: tinfo->key.tun_id);
177 if (!vlan)
178 return;
179
180 skb_dst_drop(skb);
181
182 __vlan_hwaccel_put_tag(skb, vlan_proto: p->br->vlan_proto, vlan_tci: vlan->vid);
183}
184
185int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
186 struct net_bridge_vlan *vlan)
187{
188 struct metadata_dst *tunnel_dst;
189 __be64 tunnel_id;
190 int err;
191
192 if (!vlan)
193 return 0;
194
195 tunnel_id = READ_ONCE(vlan->tinfo.tunnel_id);
196 if (!tunnel_id || unlikely(!skb_vlan_tag_present(skb)))
197 return 0;
198
199 skb_dst_drop(skb);
200 err = skb_vlan_pop(skb);
201 if (err)
202 return err;
203
204 if (BR_INPUT_SKB_CB(skb)->backup_nhid) {
205 tunnel_dst = __ip_tun_set_dst(saddr: 0, daddr: 0, tos: 0, ttl: 0, tp_dst: 0, TUNNEL_KEY,
206 tunnel_id, md_size: 0);
207 if (!tunnel_dst)
208 return -ENOMEM;
209
210 tunnel_dst->u.tun_info.mode |= IP_TUNNEL_INFO_TX |
211 IP_TUNNEL_INFO_BRIDGE;
212 tunnel_dst->u.tun_info.key.nhid =
213 BR_INPUT_SKB_CB(skb)->backup_nhid;
214 skb_dst_set(skb, dst: &tunnel_dst->dst);
215
216 return 0;
217 }
218
219 tunnel_dst = rcu_dereference(vlan->tinfo.tunnel_dst);
220 if (tunnel_dst && dst_hold_safe(dst: &tunnel_dst->dst))
221 skb_dst_set(skb, dst: &tunnel_dst->dst);
222
223 return 0;
224}
225

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