2020-01-24 04:40:20 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2020, Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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2020-03-17 06:08:35 -06:00
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#include <net/ip_tunnels.h>
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2020-01-24 04:40:20 -07:00
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#include "br_private.h"
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2020-03-17 06:08:35 -06:00
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#include "br_private_tunnel.h"
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static bool __vlan_tun_put(struct sk_buff *skb, const struct net_bridge_vlan *v)
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{
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__be32 tid = tunnel_id_to_key32(v->tinfo.tunnel_id);
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struct nlattr *nest;
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2020-03-17 06:08:35 -06:00
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if (!v->tinfo.tunnel_dst)
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return true;
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2020-03-20 05:23:02 -06:00
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nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_TUNNEL_INFO);
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if (!nest)
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return false;
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if (nla_put_u32(skb, BRIDGE_VLANDB_TINFO_ID, be32_to_cpu(tid))) {
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nla_nest_cancel(skb, nest);
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return false;
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}
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nla_nest_end(skb, nest);
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return true;
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2020-03-17 06:08:35 -06:00
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}
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static bool __vlan_tun_can_enter_range(const struct net_bridge_vlan *v_curr,
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const struct net_bridge_vlan *range_end)
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{
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return (!v_curr->tinfo.tunnel_dst && !range_end->tinfo.tunnel_dst) ||
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vlan_tunid_inrange(v_curr, range_end);
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}
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2020-01-24 04:40:20 -07:00
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2020-03-17 06:08:33 -06:00
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/* check if the options' state of v_curr allow it to enter the range */
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bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
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const struct net_bridge_vlan *range_end)
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{
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return v_curr->state == range_end->state &&
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__vlan_tun_can_enter_range(v_curr, range_end);
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2020-01-24 04:40:20 -07:00
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}
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bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v)
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{
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2020-01-24 04:40:22 -07:00
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return !nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE,
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2020-03-17 06:08:35 -06:00
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br_vlan_get_state(v)) &&
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__vlan_tun_put(skb, v);
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2020-01-24 04:40:20 -07:00
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}
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size_t br_vlan_opts_nl_size(void)
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{
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return nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_ENTRY_STATE */
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2020-03-20 05:23:02 -06:00
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+ nla_total_size(0) /* BRIDGE_VLANDB_ENTRY_TUNNEL_INFO */
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+ nla_total_size(sizeof(u32)); /* BRIDGE_VLANDB_TINFO_ID */
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2020-01-24 04:40:22 -07:00
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}
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static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
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struct net_bridge_vlan *v,
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u8 state,
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bool *changed,
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struct netlink_ext_ack *extack)
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{
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struct net_bridge *br;
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ASSERT_RTNL();
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if (state > BR_STATE_BLOCKING) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid vlan state");
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return -EINVAL;
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}
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if (br_vlan_is_brentry(v))
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br = v->br;
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else
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br = v->port->br;
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if (br->stp_enabled == BR_KERNEL_STP) {
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NL_SET_ERR_MSG_MOD(extack, "Can't modify vlan state when using kernel STP");
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return -EBUSY;
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}
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if (v->state == state)
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return 0;
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if (v->vid == br_get_pvid(vg))
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br_vlan_set_pvid_state(vg, state);
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br_vlan_set_state(v, state);
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*changed = true;
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2020-01-24 04:40:20 -07:00
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return 0;
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}
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2020-01-24 04:40:21 -07:00
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2020-03-20 05:23:02 -06:00
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static const struct nla_policy br_vlandb_tinfo_pol[BRIDGE_VLANDB_TINFO_MAX + 1] = {
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[BRIDGE_VLANDB_TINFO_ID] = { .type = NLA_U32 },
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};
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2020-03-17 06:08:36 -06:00
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static int br_vlan_modify_tunnel(const struct net_bridge_port *p,
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struct net_bridge_vlan *v,
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struct nlattr **tb,
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bool *changed,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tun_tb[BRIDGE_VLANDB_TINFO_MAX + 1], *attr;
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struct bridge_vlan_info *vinfo;
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int cmdmap, err;
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u32 tun_id;
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if (!p) {
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NL_SET_ERR_MSG_MOD(extack, "Can't modify tunnel mapping of non-port vlans");
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return -EINVAL;
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}
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if (!(p->flags & BR_VLAN_TUNNEL)) {
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NL_SET_ERR_MSG_MOD(extack, "Port doesn't have tunnel flag set");
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return -EINVAL;
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}
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2020-03-20 05:23:02 -06:00
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attr = tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO];
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err = nla_parse_nested(tun_tb, BRIDGE_VLANDB_TINFO_MAX, attr,
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br_vlandb_tinfo_pol, extack);
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if (err)
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return err;
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if (!tun_tb[BRIDGE_VLANDB_TINFO_ID]) {
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NL_SET_ERR_MSG_MOD(extack, "Missing tunnel id attribute");
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return -ENOENT;
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}
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2020-03-17 06:08:36 -06:00
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/* vlan info attribute is guaranteed by br_vlan_rtm_process_one */
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vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
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cmdmap = vinfo->flags & BRIDGE_VLAN_INFO_REMOVE_TUN ? RTM_DELLINK :
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RTM_SETLINK;
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/* when working on vlan ranges this represents the starting tunnel id */
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tun_id = nla_get_u32(tun_tb[BRIDGE_VLANDB_TINFO_ID]);
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2020-03-17 06:08:36 -06:00
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/* tunnel ids are mapped to each vlan in increasing order,
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* the starting vlan is in BRIDGE_VLANDB_ENTRY_INFO and v is the
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* current vlan, so we compute: tun_id + v - vinfo->vid
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*/
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tun_id += v->vid - vinfo->vid;
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return br_vlan_tunnel_info(p, cmdmap, v->vid, tun_id, changed);
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}
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2020-01-24 04:40:21 -07:00
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static int br_vlan_process_one_opts(const struct net_bridge *br,
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const struct net_bridge_port *p,
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struct net_bridge_vlan_group *vg,
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struct net_bridge_vlan *v,
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struct nlattr **tb,
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bool *changed,
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struct netlink_ext_ack *extack)
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{
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2020-01-24 04:40:22 -07:00
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int err;
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2020-01-24 04:40:21 -07:00
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*changed = false;
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2020-01-24 04:40:22 -07:00
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if (tb[BRIDGE_VLANDB_ENTRY_STATE]) {
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u8 state = nla_get_u8(tb[BRIDGE_VLANDB_ENTRY_STATE]);
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err = br_vlan_modify_state(vg, v, state, changed, extack);
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if (err)
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return err;
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}
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2020-03-20 05:23:02 -06:00
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if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO]) {
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2020-03-17 06:08:36 -06:00
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err = br_vlan_modify_tunnel(p, v, tb, changed, extack);
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if (err)
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return err;
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}
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2020-01-24 04:40:22 -07:00
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2020-01-24 04:40:21 -07:00
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return 0;
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}
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int br_vlan_process_options(const struct net_bridge *br,
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const struct net_bridge_port *p,
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struct net_bridge_vlan *range_start,
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struct net_bridge_vlan *range_end,
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struct nlattr **tb,
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struct netlink_ext_ack *extack)
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{
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struct net_bridge_vlan *v, *curr_start = NULL, *curr_end = NULL;
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struct net_bridge_vlan_group *vg;
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int vid, err = 0;
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u16 pvid;
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if (p)
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vg = nbp_vlan_group(p);
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else
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vg = br_vlan_group(br);
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if (!range_start || !br_vlan_should_use(range_start)) {
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NL_SET_ERR_MSG_MOD(extack, "Vlan range start doesn't exist, can't process options");
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return -ENOENT;
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}
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if (!range_end || !br_vlan_should_use(range_end)) {
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NL_SET_ERR_MSG_MOD(extack, "Vlan range end doesn't exist, can't process options");
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return -ENOENT;
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}
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pvid = br_get_pvid(vg);
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for (vid = range_start->vid; vid <= range_end->vid; vid++) {
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bool changed = false;
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v = br_vlan_find(vg, vid);
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if (!v || !br_vlan_should_use(v)) {
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NL_SET_ERR_MSG_MOD(extack, "Vlan in range doesn't exist, can't process options");
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err = -ENOENT;
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break;
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}
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err = br_vlan_process_one_opts(br, p, vg, v, tb, &changed,
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extack);
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if (err)
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break;
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if (changed) {
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/* vlan options changed, check for range */
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if (!curr_start) {
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curr_start = v;
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curr_end = v;
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continue;
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}
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if (v->vid == pvid ||
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!br_vlan_can_enter_range(v, curr_end)) {
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br_vlan_notify(br, p, curr_start->vid,
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curr_end->vid, RTM_NEWVLAN);
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curr_start = v;
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}
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curr_end = v;
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} else {
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/* nothing changed and nothing to notify yet */
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if (!curr_start)
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continue;
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br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
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RTM_NEWVLAN);
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curr_start = NULL;
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curr_end = NULL;
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}
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}
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if (curr_start)
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br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
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RTM_NEWVLAN);
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return err;
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}
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