// SPDX-License-Identifier: GPL-2.0-only // Copyright (c) 2020, Nikolay Aleksandrov <nikolay@cumulusnetworks.com> #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/rtnetlink.h> #include <linux/slab.h> #include <net/ip_tunnels.h> #include "br_private.h" #include "br_private_tunnel.h" static bool __vlan_tun_put(struct sk_buff *skb, const struct net_bridge_vlan *v) { __be32 tid = tunnel_id_to_key32(v->tinfo.tunnel_id); struct nlattr *nest; if (!v->tinfo.tunnel_dst) return true; nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_TUNNEL_INFO); if (!nest) return false; if (nla_put_u32(skb, BRIDGE_VLANDB_TINFO_ID, be32_to_cpu(tid))) { nla_nest_cancel(skb, nest); return false; } nla_nest_end(skb, nest); return true; } static bool __vlan_tun_can_enter_range(const struct net_bridge_vlan *v_curr, const struct net_bridge_vlan *range_end) { return (!v_curr->tinfo.tunnel_dst && !range_end->tinfo.tunnel_dst) || vlan_tunid_inrange(v_curr, range_end); } /* check if the options' state of v_curr allow it to enter the range */ bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr, const struct net_bridge_vlan *range_end) { return v_curr->state == range_end->state && __vlan_tun_can_enter_range(v_curr, range_end); } bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v) { return !nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE, br_vlan_get_state(v)) && __vlan_tun_put(skb, v); } size_t br_vlan_opts_nl_size(void) { return nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_ENTRY_STATE */ + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY_TUNNEL_INFO */ + nla_total_size(sizeof(u32)); /* BRIDGE_VLANDB_TINFO_ID */ } static int br_vlan_modify_state(struct net_bridge_vlan_group *vg, struct net_bridge_vlan *v, u8 state, bool *changed, struct netlink_ext_ack *extack) { struct net_bridge *br; ASSERT_RTNL(); if (state > BR_STATE_BLOCKING) { NL_SET_ERR_MSG_MOD(extack, "Invalid vlan state"); return -EINVAL; } if (br_vlan_is_brentry(v)) br = v->br; else br = v->port->br; if (br->stp_enabled == BR_KERNEL_STP) { NL_SET_ERR_MSG_MOD(extack, "Can't modify vlan state when using kernel STP"); return -EBUSY; } if (v->state == state) return 0; if (v->vid == br_get_pvid(vg)) br_vlan_set_pvid_state(vg, state); br_vlan_set_state(v, state); *changed = true; return 0; } static const struct nla_policy br_vlandb_tinfo_pol[BRIDGE_VLANDB_TINFO_MAX + 1] = { [BRIDGE_VLANDB_TINFO_ID] = { .type = NLA_U32 }, [BRIDGE_VLANDB_TINFO_CMD] = { .type = NLA_U32 }, }; static int br_vlan_modify_tunnel(const struct net_bridge_port *p, struct net_bridge_vlan *v, struct nlattr **tb, bool *changed, struct netlink_ext_ack *extack) { struct nlattr *tun_tb[BRIDGE_VLANDB_TINFO_MAX + 1], *attr; struct bridge_vlan_info *vinfo; u32 tun_id = 0; int cmd, err; if (!p) { NL_SET_ERR_MSG_MOD(extack, "Can't modify tunnel mapping of non-port vlans"); return -EINVAL; } if (!(p->flags & BR_VLAN_TUNNEL)) { NL_SET_ERR_MSG_MOD(extack, "Port doesn't have tunnel flag set"); return -EINVAL; } attr = tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO]; err = nla_parse_nested(tun_tb, BRIDGE_VLANDB_TINFO_MAX, attr, br_vlandb_tinfo_pol, extack); if (err) return err; if (!tun_tb[BRIDGE_VLANDB_TINFO_CMD]) { NL_SET_ERR_MSG_MOD(extack, "Missing tunnel command attribute"); return -ENOENT; } cmd = nla_get_u32(tun_tb[BRIDGE_VLANDB_TINFO_CMD]); switch (cmd) { case RTM_SETLINK: if (!tun_tb[BRIDGE_VLANDB_TINFO_ID]) { NL_SET_ERR_MSG_MOD(extack, "Missing tunnel id attribute"); return -ENOENT; } /* when working on vlan ranges this is the starting tunnel id */ tun_id = nla_get_u32(tun_tb[BRIDGE_VLANDB_TINFO_ID]); /* vlan info attr is guaranteed by br_vlan_rtm_process_one */ vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]); /* tunnel ids are mapped to each vlan in increasing order, * the starting vlan is in BRIDGE_VLANDB_ENTRY_INFO and v is the * current vlan, so we compute: tun_id + v - vinfo->vid */ tun_id += v->vid - vinfo->vid; break; case RTM_DELLINK: break; default: NL_SET_ERR_MSG_MOD(extack, "Unsupported tunnel command"); return -EINVAL; } return br_vlan_tunnel_info(p, cmd, v->vid, tun_id, changed); } static int br_vlan_process_one_opts(const struct net_bridge *br, const struct net_bridge_port *p, struct net_bridge_vlan_group *vg, struct net_bridge_vlan *v, struct nlattr **tb, bool *changed, struct netlink_ext_ack *extack) { int err; *changed = false; if (tb[BRIDGE_VLANDB_ENTRY_STATE]) { u8 state = nla_get_u8(tb[BRIDGE_VLANDB_ENTRY_STATE]); err = br_vlan_modify_state(vg, v, state, changed, extack); if (err) return err; } if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO]) { err = br_vlan_modify_tunnel(p, v, tb, changed, extack); if (err) return err; } return 0; } int br_vlan_process_options(const struct net_bridge *br, const struct net_bridge_port *p, struct net_bridge_vlan *range_start, struct net_bridge_vlan *range_end, struct nlattr **tb, struct netlink_ext_ack *extack) { struct net_bridge_vlan *v, *curr_start = NULL, *curr_end = NULL; struct net_bridge_vlan_group *vg; int vid, err = 0; u16 pvid; if (p) vg = nbp_vlan_group(p); else vg = br_vlan_group(br); if (!range_start || !br_vlan_should_use(range_start)) { NL_SET_ERR_MSG_MOD(extack, "Vlan range start doesn't exist, can't process options"); return -ENOENT; } if (!range_end || !br_vlan_should_use(range_end)) { NL_SET_ERR_MSG_MOD(extack, "Vlan range end doesn't exist, can't process options"); return -ENOENT; } pvid = br_get_pvid(vg); for (vid = range_start->vid; vid <= range_end->vid; vid++) { bool changed = false; v = br_vlan_find(vg, vid); if (!v || !br_vlan_should_use(v)) { NL_SET_ERR_MSG_MOD(extack, "Vlan in range doesn't exist, can't process options"); err = -ENOENT; break; } err = br_vlan_process_one_opts(br, p, vg, v, tb, &changed, extack); if (err) break; if (changed) { /* vlan options changed, check for range */ if (!curr_start) { curr_start = v; curr_end = v; continue; } if (v->vid == pvid || !br_vlan_can_enter_range(v, curr_end)) { br_vlan_notify(br, p, curr_start->vid, curr_end->vid, RTM_NEWVLAN); curr_start = v; } curr_end = v; } else { /* nothing changed and nothing to notify yet */ if (!curr_start) continue; br_vlan_notify(br, p, curr_start->vid, curr_end->vid, RTM_NEWVLAN); curr_start = NULL; curr_end = NULL; } } if (curr_start) br_vlan_notify(br, p, curr_start->vid, curr_end->vid, RTM_NEWVLAN); return err; }