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 u64 tunnel_id) 39 { 40 return rhashtable_lookup_fast(tbl, &tunnel_id, 41 br_vlan_tunnel_rht_params); 42 } 43 44 void 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 56 static 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; 81 out: 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 */ 92 int nbp_vlan_tunnel_info_add(struct net_bridge_port *port, u16 vid, u32 tun_id) 93 { 94 struct net_bridge_vlan_group *vg; 95 struct net_bridge_vlan *vlan; 96 97 ASSERT_RTNL(); 98 99 vg = nbp_vlan_group(port); 100 vlan = br_vlan_find(vg, vid); 101 if (!vlan) 102 return -EINVAL; 103 104 return __vlan_tunnel_info_add(vg, vlan, tun_id); 105 } 106 107 /* Must be protected by RTNL. 108 * Must be called with vid in range from 1 to 4094 inclusive. 109 */ 110 int nbp_vlan_tunnel_info_delete(struct net_bridge_port *port, u16 vid) 111 { 112 struct net_bridge_vlan_group *vg; 113 struct net_bridge_vlan *v; 114 115 ASSERT_RTNL(); 116 117 vg = nbp_vlan_group(port); 118 v = br_vlan_find(vg, vid); 119 if (!v) 120 return -ENOENT; 121 122 vlan_tunnel_info_del(vg, v); 123 124 return 0; 125 } 126 127 static void __vlan_tunnel_info_flush(struct net_bridge_vlan_group *vg) 128 { 129 struct net_bridge_vlan *vlan, *tmp; 130 131 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) 132 vlan_tunnel_info_del(vg, vlan); 133 } 134 135 void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port) 136 { 137 struct net_bridge_vlan_group *vg; 138 139 ASSERT_RTNL(); 140 141 vg = nbp_vlan_group(port); 142 __vlan_tunnel_info_flush(vg); 143 } 144 145 int vlan_tunnel_init(struct net_bridge_vlan_group *vg) 146 { 147 return rhashtable_init(&vg->tunnel_hash, &br_vlan_tunnel_rht_params); 148 } 149 150 void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg) 151 { 152 rhashtable_destroy(&vg->tunnel_hash); 153 } 154 155 int br_handle_ingress_vlan_tunnel(struct sk_buff *skb, 156 struct net_bridge_port *p, 157 struct net_bridge_vlan_group *vg) 158 { 159 struct ip_tunnel_info *tinfo = skb_tunnel_info(skb); 160 struct net_bridge_vlan *vlan; 161 162 if (!vg || !tinfo) 163 return 0; 164 165 /* if already tagged, ignore */ 166 if (skb_vlan_tagged(skb)) 167 return 0; 168 169 /* lookup vid, given tunnel id */ 170 vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id); 171 if (!vlan) 172 return 0; 173 174 skb_dst_drop(skb); 175 176 __vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid); 177 178 return 0; 179 } 180 181 int br_handle_egress_vlan_tunnel(struct sk_buff *skb, 182 struct net_bridge_vlan *vlan) 183 { 184 int err; 185 186 if (!vlan || !vlan->tinfo.tunnel_id) 187 return 0; 188 189 if (unlikely(!skb_vlan_tag_present(skb))) 190 return 0; 191 192 skb_dst_drop(skb); 193 err = skb_vlan_pop(skb); 194 if (err) 195 return err; 196 197 skb_dst_set(skb, dst_clone(&vlan->tinfo.tunnel_dst->dst)); 198 199 return 0; 200 } 201