tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 u64 tunnel_id)
39{
40 return rhashtable_lookup_fast(tbl, &tunnel_id,
41 br_vlan_tunnel_rht_params);
42}
43
44void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
45 struct net_bridge_vlan *vlan)
46{
47 if (!vlan->tinfo.tunnel_dst)
48 return;
49 rhashtable_remove_fast(&vg->tunnel_hash, &vlan->tnode,
50 br_vlan_tunnel_rht_params);
51 vlan->tinfo.tunnel_id = 0;
52 dst_release(&vlan->tinfo.tunnel_dst->dst);
53 vlan->tinfo.tunnel_dst = NULL;
54}
55
56static int __vlan_tunnel_info_add(struct net_bridge_vlan_group *vg,
57 struct net_bridge_vlan *vlan, u32 tun_id)
58{
59 struct metadata_dst *metadata = NULL;
60 __be64 key = key32_to_tunnel_id(cpu_to_be32(tun_id));
61 int err;
62
63 if (vlan->tinfo.tunnel_dst)
64 return -EEXIST;
65
66 metadata = __ip_tun_set_dst(0, 0, 0, 0, 0, TUNNEL_KEY,
67 key, 0);
68 if (!metadata)
69 return -EINVAL;
70
71 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_BRIDGE;
72 vlan->tinfo.tunnel_dst = metadata;
73 vlan->tinfo.tunnel_id = key;
74
75 err = rhashtable_lookup_insert_fast(&vg->tunnel_hash, &vlan->tnode,
76 br_vlan_tunnel_rht_params);
77 if (err)
78 goto out;
79
80 return 0;
81out:
82 dst_release(&vlan->tinfo.tunnel_dst->dst);
83 vlan->tinfo.tunnel_dst = NULL;
84 vlan->tinfo.tunnel_id = 0;
85
86 return err;
87}
88
89/* Must be protected by RTNL.
90 * Must be called with vid in range from 1 to 4094 inclusive.
91 */
92int nbp_vlan_tunnel_info_add(const struct net_bridge_port *port, u16 vid,
93 u32 tun_id)
94{
95 struct net_bridge_vlan_group *vg;
96 struct net_bridge_vlan *vlan;
97
98 ASSERT_RTNL();
99
100 vg = nbp_vlan_group(port);
101 vlan = br_vlan_find(vg, vid);
102 if (!vlan)
103 return -EINVAL;
104
105 return __vlan_tunnel_info_add(vg, vlan, tun_id);
106}
107
108/* Must be protected by RTNL.
109 * Must be called with vid in range from 1 to 4094 inclusive.
110 */
111int nbp_vlan_tunnel_info_delete(const struct net_bridge_port *port, u16 vid)
112{
113 struct net_bridge_vlan_group *vg;
114 struct net_bridge_vlan *v;
115
116 ASSERT_RTNL();
117
118 vg = nbp_vlan_group(port);
119 v = br_vlan_find(vg, vid);
120 if (!v)
121 return -ENOENT;
122
123 vlan_tunnel_info_del(vg, v);
124
125 return 0;
126}
127
128static void __vlan_tunnel_info_flush(struct net_bridge_vlan_group *vg)
129{
130 struct net_bridge_vlan *vlan, *tmp;
131
132 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
133 vlan_tunnel_info_del(vg, vlan);
134}
135
136void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port)
137{
138 struct net_bridge_vlan_group *vg;
139
140 ASSERT_RTNL();
141
142 vg = nbp_vlan_group(port);
143 __vlan_tunnel_info_flush(vg);
144}
145
146int vlan_tunnel_init(struct net_bridge_vlan_group *vg)
147{
148 return rhashtable_init(&vg->tunnel_hash, &br_vlan_tunnel_rht_params);
149}
150
151void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg)
152{
153 rhashtable_destroy(&vg->tunnel_hash);
154}
155
156int br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
157 struct net_bridge_port *p,
158 struct net_bridge_vlan_group *vg)
159{
160 struct ip_tunnel_info *tinfo = skb_tunnel_info(skb);
161 struct net_bridge_vlan *vlan;
162
163 if (!vg || !tinfo)
164 return 0;
165
166 /* if already tagged, ignore */
167 if (skb_vlan_tagged(skb))
168 return 0;
169
170 /* lookup vid, given tunnel id */
171 vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id);
172 if (!vlan)
173 return 0;
174
175 skb_dst_drop(skb);
176
177 __vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid);
178
179 return 0;
180}
181
182int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
183 struct net_bridge_vlan *vlan)
184{
185 int err;
186
187 if (!vlan || !vlan->tinfo.tunnel_id)
188 return 0;
189
190 if (unlikely(!skb_vlan_tag_present(skb)))
191 return 0;
192
193 skb_dst_drop(skb);
194 err = skb_vlan_pop(skb);
195 if (err)
196 return err;
197
198 skb_dst_set(skb, dst_clone(&vlan->tinfo.tunnel_dst->dst));
199
200 return 0;
201}