| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Bridge per vlan tunnel port dst_metadata handling code |
| * |
| * Authors: |
| * Roopa Prabhu <roopa@cumulusnetworks.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/netdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/slab.h> |
| #include <net/switchdev.h> |
| #include <net/dst_metadata.h> |
| |
| #include "br_private.h" |
| #include "br_private_tunnel.h" |
| |
| static inline int br_vlan_tunid_cmp(struct rhashtable_compare_arg *arg, |
| const void *ptr) |
| { |
| const struct net_bridge_vlan *vle = ptr; |
| __be64 tunid = *(__be64 *)arg->key; |
| |
| return vle->tinfo.tunnel_id != tunid; |
| } |
| |
| static const struct rhashtable_params br_vlan_tunnel_rht_params = { |
| .head_offset = offsetof(struct net_bridge_vlan, tnode), |
| .key_offset = offsetof(struct net_bridge_vlan, tinfo.tunnel_id), |
| .key_len = sizeof(__be64), |
| .nelem_hint = 3, |
| .obj_cmpfn = br_vlan_tunid_cmp, |
| .automatic_shrinking = true, |
| }; |
| |
| static struct net_bridge_vlan *br_vlan_tunnel_lookup(struct rhashtable *tbl, |
| __be64 tunnel_id) |
| { |
| return rhashtable_lookup_fast(tbl, &tunnel_id, |
| br_vlan_tunnel_rht_params); |
| } |
| |
| static void vlan_tunnel_info_release(struct net_bridge_vlan *vlan) |
| { |
| struct metadata_dst *tdst = rtnl_dereference(vlan->tinfo.tunnel_dst); |
| |
| WRITE_ONCE(vlan->tinfo.tunnel_id, 0); |
| RCU_INIT_POINTER(vlan->tinfo.tunnel_dst, NULL); |
| dst_release(&tdst->dst); |
| } |
| |
| void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg, |
| struct net_bridge_vlan *vlan) |
| { |
| if (!rcu_access_pointer(vlan->tinfo.tunnel_dst)) |
| return; |
| rhashtable_remove_fast(&vg->tunnel_hash, &vlan->tnode, |
| br_vlan_tunnel_rht_params); |
| vlan_tunnel_info_release(vlan); |
| } |
| |
| static int __vlan_tunnel_info_add(struct net_bridge_vlan_group *vg, |
| struct net_bridge_vlan *vlan, u32 tun_id) |
| { |
| struct metadata_dst *metadata = rtnl_dereference(vlan->tinfo.tunnel_dst); |
| __be64 key = key32_to_tunnel_id(cpu_to_be32(tun_id)); |
| int err; |
| |
| if (metadata) |
| return -EEXIST; |
| |
| metadata = __ip_tun_set_dst(0, 0, 0, 0, 0, TUNNEL_KEY, |
| key, 0); |
| if (!metadata) |
| return -EINVAL; |
| |
| metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_BRIDGE; |
| rcu_assign_pointer(vlan->tinfo.tunnel_dst, metadata); |
| WRITE_ONCE(vlan->tinfo.tunnel_id, key); |
| |
| err = rhashtable_lookup_insert_fast(&vg->tunnel_hash, &vlan->tnode, |
| br_vlan_tunnel_rht_params); |
| if (err) |
| goto out; |
| |
| return 0; |
| out: |
| vlan_tunnel_info_release(vlan); |
| |
| return err; |
| } |
| |
| /* Must be protected by RTNL. |
| * Must be called with vid in range from 1 to 4094 inclusive. |
| */ |
| int nbp_vlan_tunnel_info_add(const struct net_bridge_port *port, u16 vid, |
| u32 tun_id) |
| { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_vlan *vlan; |
| |
| ASSERT_RTNL(); |
| |
| vg = nbp_vlan_group(port); |
| vlan = br_vlan_find(vg, vid); |
| if (!vlan) |
| return -EINVAL; |
| |
| return __vlan_tunnel_info_add(vg, vlan, tun_id); |
| } |
| |
| /* Must be protected by RTNL. |
| * Must be called with vid in range from 1 to 4094 inclusive. |
| */ |
| int nbp_vlan_tunnel_info_delete(const struct net_bridge_port *port, u16 vid) |
| { |
| struct net_bridge_vlan_group *vg; |
| struct net_bridge_vlan *v; |
| |
| ASSERT_RTNL(); |
| |
| vg = nbp_vlan_group(port); |
| v = br_vlan_find(vg, vid); |
| if (!v) |
| return -ENOENT; |
| |
| vlan_tunnel_info_del(vg, v); |
| |
| return 0; |
| } |
| |
| static void __vlan_tunnel_info_flush(struct net_bridge_vlan_group *vg) |
| { |
| struct net_bridge_vlan *vlan, *tmp; |
| |
| list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) |
| vlan_tunnel_info_del(vg, vlan); |
| } |
| |
| void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port) |
| { |
| struct net_bridge_vlan_group *vg; |
| |
| ASSERT_RTNL(); |
| |
| vg = nbp_vlan_group(port); |
| __vlan_tunnel_info_flush(vg); |
| } |
| |
| int vlan_tunnel_init(struct net_bridge_vlan_group *vg) |
| { |
| return rhashtable_init(&vg->tunnel_hash, &br_vlan_tunnel_rht_params); |
| } |
| |
| void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg) |
| { |
| rhashtable_destroy(&vg->tunnel_hash); |
| } |
| |
| int br_handle_ingress_vlan_tunnel(struct sk_buff *skb, |
| struct net_bridge_port *p, |
| struct net_bridge_vlan_group *vg) |
| { |
| struct ip_tunnel_info *tinfo = skb_tunnel_info(skb); |
| struct net_bridge_vlan *vlan; |
| |
| if (!vg || !tinfo) |
| return 0; |
| |
| /* if already tagged, ignore */ |
| if (skb_vlan_tagged(skb)) |
| return 0; |
| |
| /* lookup vid, given tunnel id */ |
| vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id); |
| if (!vlan) |
| return 0; |
| |
| skb_dst_drop(skb); |
| |
| __vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid); |
| |
| return 0; |
| } |
| |
| int br_handle_egress_vlan_tunnel(struct sk_buff *skb, |
| struct net_bridge_vlan *vlan) |
| { |
| struct metadata_dst *tunnel_dst; |
| __be64 tunnel_id; |
| int err; |
| |
| if (!vlan) |
| return 0; |
| |
| tunnel_id = READ_ONCE(vlan->tinfo.tunnel_id); |
| if (!tunnel_id || unlikely(!skb_vlan_tag_present(skb))) |
| return 0; |
| |
| skb_dst_drop(skb); |
| err = skb_vlan_pop(skb); |
| if (err) |
| return err; |
| |
| tunnel_dst = rcu_dereference(vlan->tinfo.tunnel_dst); |
| if (tunnel_dst && dst_hold_safe(&tunnel_dst->dst)) |
| skb_dst_set(skb, &tunnel_dst->dst); |
| |
| return 0; |
| } |