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 19 static 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 28 static 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 37 static struct net_bridge_vlan *br_vlan_tunnel_lookup(struct rhashtable *tbl, 38 __be64 tunnel_id) 39 { 40 return rhashtable_lookup_fast(tbl, &tunnel_id, 41 br_vlan_tunnel_rht_params); 42 } 43 44 static 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(&tdst->dst); 51 } 52 53 void 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(&vg->tunnel_hash, &vlan->tnode, 59 br_vlan_tunnel_rht_params); 60 vlan_tunnel_info_release(vlan); 61 } 62 63 static 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(0, 0, 0, 0, 0, TUNNEL_KEY, 74 key, 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(&vg->tunnel_hash, &vlan->tnode, 83 br_vlan_tunnel_rht_params); 84 if (err) 85 goto out; 86 87 return 0; 88 out: 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 */ 97 int 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(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 */ 116 int 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(port); 124 v = br_vlan_find(vg, vid); 125 if (!v) 126 return -ENOENT; 127 128 vlan_tunnel_info_del(vg, v); 129 130 return 0; 131 } 132 133 static 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 } 140 141 void 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(port); 148 __vlan_tunnel_info_flush(vg); 149 } 150 151 int vlan_tunnel_init(struct net_bridge_vlan_group *vg) 152 { 153 return rhashtable_init(&vg->tunnel_hash, &br_vlan_tunnel_rht_params); 154 } 155 156 void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg) 157 { 158 rhashtable_destroy(&vg->tunnel_hash); 159 } 160 161 void 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(&vg->tunnel_hash, tinfo->key.tun_id); 177 if (!vlan) 178 return; 179 180 skb_dst_drop(skb); 181 182 __vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid); 183 } 184 185 int 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(0, 0, 0, 0, 0, TUNNEL_KEY, 206 tunnel_id, 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, &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(&tunnel_dst->dst)) 221 skb_dst_set(skb, &tunnel_dst->dst); 222 223 return 0; 224 } 225