1 /* 2 * Bridge per vlan tunnel port dst_metadata handling code 3 * 4 * Authors: 5 * Roopa Prabhu <roopa@cumulusnetworks.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/slab.h> 17 #include <net/switchdev.h> 18 #include <net/dst_metadata.h> 19 20 #include "br_private.h" 21 #include "br_private_tunnel.h" 22 23 static inline int br_vlan_tunid_cmp(struct rhashtable_compare_arg *arg, 24 const void *ptr) 25 { 26 const struct net_bridge_vlan *vle = ptr; 27 __be64 tunid = *(__be64 *)arg->key; 28 29 return vle->tinfo.tunnel_id != tunid; 30 } 31 32 static const struct rhashtable_params br_vlan_tunnel_rht_params = { 33 .head_offset = offsetof(struct net_bridge_vlan, tnode), 34 .key_offset = offsetof(struct net_bridge_vlan, tinfo.tunnel_id), 35 .key_len = sizeof(__be64), 36 .nelem_hint = 3, 37 .obj_cmpfn = br_vlan_tunid_cmp, 38 .automatic_shrinking = true, 39 }; 40 41 static struct net_bridge_vlan *br_vlan_tunnel_lookup(struct rhashtable *tbl, 42 u64 tunnel_id) 43 { 44 return rhashtable_lookup_fast(tbl, &tunnel_id, 45 br_vlan_tunnel_rht_params); 46 } 47 48 void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg, 49 struct net_bridge_vlan *vlan) 50 { 51 if (!vlan->tinfo.tunnel_dst) 52 return; 53 rhashtable_remove_fast(&vg->tunnel_hash, &vlan->tnode, 54 br_vlan_tunnel_rht_params); 55 vlan->tinfo.tunnel_id = 0; 56 dst_release(&vlan->tinfo.tunnel_dst->dst); 57 vlan->tinfo.tunnel_dst = NULL; 58 } 59 60 static int __vlan_tunnel_info_add(struct net_bridge_vlan_group *vg, 61 struct net_bridge_vlan *vlan, u32 tun_id) 62 { 63 struct metadata_dst *metadata = NULL; 64 __be64 key = key32_to_tunnel_id(cpu_to_be32(tun_id)); 65 int err; 66 67 if (vlan->tinfo.tunnel_dst) 68 return -EEXIST; 69 70 metadata = __ip_tun_set_dst(0, 0, 0, 0, 0, TUNNEL_KEY, 71 key, 0); 72 if (!metadata) 73 return -EINVAL; 74 75 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_BRIDGE; 76 vlan->tinfo.tunnel_dst = metadata; 77 vlan->tinfo.tunnel_id = key; 78 79 err = rhashtable_lookup_insert_fast(&vg->tunnel_hash, &vlan->tnode, 80 br_vlan_tunnel_rht_params); 81 if (err) 82 goto out; 83 84 return 0; 85 out: 86 dst_release(&vlan->tinfo.tunnel_dst->dst); 87 vlan->tinfo.tunnel_dst = NULL; 88 vlan->tinfo.tunnel_id = 0; 89 90 return err; 91 } 92 93 /* Must be protected by RTNL. 94 * Must be called with vid in range from 1 to 4094 inclusive. 95 */ 96 int nbp_vlan_tunnel_info_add(struct net_bridge_port *port, u16 vid, u32 tun_id) 97 { 98 struct net_bridge_vlan_group *vg; 99 struct net_bridge_vlan *vlan; 100 101 ASSERT_RTNL(); 102 103 vg = nbp_vlan_group(port); 104 vlan = br_vlan_find(vg, vid); 105 if (!vlan) 106 return -EINVAL; 107 108 return __vlan_tunnel_info_add(vg, vlan, tun_id); 109 } 110 111 /* Must be protected by RTNL. 112 * Must be called with vid in range from 1 to 4094 inclusive. 113 */ 114 int nbp_vlan_tunnel_info_delete(struct net_bridge_port *port, u16 vid) 115 { 116 struct net_bridge_vlan_group *vg; 117 struct net_bridge_vlan *v; 118 119 ASSERT_RTNL(); 120 121 vg = nbp_vlan_group(port); 122 v = br_vlan_find(vg, vid); 123 if (!v) 124 return -ENOENT; 125 126 vlan_tunnel_info_del(vg, v); 127 128 return 0; 129 } 130 131 static void __vlan_tunnel_info_flush(struct net_bridge_vlan_group *vg) 132 { 133 struct net_bridge_vlan *vlan, *tmp; 134 135 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) 136 vlan_tunnel_info_del(vg, vlan); 137 } 138 139 void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port) 140 { 141 struct net_bridge_vlan_group *vg; 142 143 ASSERT_RTNL(); 144 145 vg = nbp_vlan_group(port); 146 __vlan_tunnel_info_flush(vg); 147 } 148 149 int vlan_tunnel_init(struct net_bridge_vlan_group *vg) 150 { 151 return rhashtable_init(&vg->tunnel_hash, &br_vlan_tunnel_rht_params); 152 } 153 154 void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg) 155 { 156 rhashtable_destroy(&vg->tunnel_hash); 157 } 158 159 int br_handle_ingress_vlan_tunnel(struct sk_buff *skb, 160 struct net_bridge_port *p, 161 struct net_bridge_vlan_group *vg) 162 { 163 struct ip_tunnel_info *tinfo = skb_tunnel_info(skb); 164 struct net_bridge_vlan *vlan; 165 166 if (!vg || !tinfo) 167 return 0; 168 169 /* if already tagged, ignore */ 170 if (skb_vlan_tagged(skb)) 171 return 0; 172 173 /* lookup vid, given tunnel id */ 174 vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id); 175 if (!vlan) 176 return 0; 177 178 skb_dst_drop(skb); 179 180 __vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid); 181 182 return 0; 183 } 184 185 int br_handle_egress_vlan_tunnel(struct sk_buff *skb, 186 struct net_bridge_vlan *vlan) 187 { 188 int err; 189 190 if (!vlan || !vlan->tinfo.tunnel_id) 191 return 0; 192 193 if (unlikely(!skb_vlan_tag_present(skb))) 194 return 0; 195 196 skb_dst_drop(skb); 197 err = skb_vlan_pop(skb); 198 if (err) 199 return err; 200 201 skb_dst_set(skb, dst_clone(&vlan->tinfo.tunnel_dst->dst)); 202 203 return 0; 204 } 205