net/bridge/br_vlan_options.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright (c) 2020, Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
   3 #include <linux/kernel.h>
   4 #include <linux/netdevice.h>
   5 #include <linux/rtnetlink.h>
   6 #include <linux/slab.h>
   7
   8 #include "br_private.h"
   9
  10 /* check if the options between two vlans are equal */
  11 bool br_vlan_opts_eq(const struct net_bridge_vlan *v1,
  12                      const struct net_bridge_vlan *v2)
  13 {
  14         return v1->state == v2->state;
  15 }
  16
  17 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v)
  18 {
  19         return !nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE,
  20                            br_vlan_get_state(v));
  21 }
  22
  23 size_t br_vlan_opts_nl_size(void)
  24 {
  25         return nla_total_size(sizeof(u8)); /* BRIDGE_VLANDB_ENTRY_STATE */
  26 }
  27
  28 static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
  29                                 struct net_bridge_vlan *v,
  30                                 u8 state,
  31                                 bool *changed,
  32                                 struct netlink_ext_ack *extack)
  33 {
  34         struct net_bridge *br;
  35
  36         ASSERT_RTNL();
  37
  38         if (state > BR_STATE_BLOCKING) {
  39                 NL_SET_ERR_MSG_MOD(extack, "Invalid vlan state");
  40                 return -EINVAL;
  41         }
  42
  43         if (br_vlan_is_brentry(v))
  44                 br = v->br;
  45         else
  46                 br = v->port->br;
  47
  48         if (br->stp_enabled == BR_KERNEL_STP) {
  49                 NL_SET_ERR_MSG_MOD(extack, "Can't modify vlan state when using kernel STP");
  50                 return -EBUSY;
  51         }
  52
  53         if (v->state == state)
  54                 return 0;
  55
  56         if (v->vid == br_get_pvid(vg))
  57                 br_vlan_set_pvid_state(vg, state);
  58
  59         br_vlan_set_state(v, state);
  60         *changed = true;
  61
  62         return 0;
  63 }
  64
  65 static int br_vlan_process_one_opts(const struct net_bridge *br,
  66                                     const struct net_bridge_port *p,
  67                                     struct net_bridge_vlan_group *vg,
  68                                     struct net_bridge_vlan *v,
  69                                     struct nlattr **tb,
  70                                     bool *changed,
  71                                     struct netlink_ext_ack *extack)
  72 {
  73         int err;
  74
  75         *changed = false;
  76         if (tb[BRIDGE_VLANDB_ENTRY_STATE]) {
  77                 u8 state = nla_get_u8(tb[BRIDGE_VLANDB_ENTRY_STATE]);
  78
  79                 err = br_vlan_modify_state(vg, v, state, changed, extack);
  80                 if (err)
  81                         return err;
  82         }
  83
  84         return 0;
  85 }
  86
  87 int br_vlan_process_options(const struct net_bridge *br,
  88                             const struct net_bridge_port *p,
  89                             struct net_bridge_vlan *range_start,
  90                             struct net_bridge_vlan *range_end,
  91                             struct nlattr **tb,
  92                             struct netlink_ext_ack *extack)
  93 {
  94         struct net_bridge_vlan *v, *curr_start = NULL, *curr_end = NULL;
  95         struct net_bridge_vlan_group *vg;
  96         int vid, err = 0;
  97         u16 pvid;
  98
  99         if (p)
 100                 vg = nbp_vlan_group(p);
 101         else
 102                 vg = br_vlan_group(br);
 103
 104         if (!range_start || !br_vlan_should_use(range_start)) {
 105                 NL_SET_ERR_MSG_MOD(extack, "Vlan range start doesn't exist, can't process options");
 106                 return -ENOENT;
 107         }
 108         if (!range_end || !br_vlan_should_use(range_end)) {
 109                 NL_SET_ERR_MSG_MOD(extack, "Vlan range end doesn't exist, can't process options");
 110                 return -ENOENT;
 111         }
 112
 113         pvid = br_get_pvid(vg);
 114         for (vid = range_start->vid; vid <= range_end->vid; vid++) {
 115                 bool changed = false;
 116
 117                 v = br_vlan_find(vg, vid);
 118                 if (!v || !br_vlan_should_use(v)) {
 119                         NL_SET_ERR_MSG_MOD(extack, "Vlan in range doesn't exist, can't process options");
 120                         err = -ENOENT;
 121                         break;
 122                 }
 123
 124                 err = br_vlan_process_one_opts(br, p, vg, v, tb, &changed,
 125                                                extack);
 126                 if (err)
 127                         break;
 128
 129                 if (changed) {
 130                         /* vlan options changed, check for range */
 131                         if (!curr_start) {
 132                                 curr_start = v;
 133                                 curr_end = v;
 134                                 continue;
 135                         }
 136
 137                         if (v->vid == pvid ||
 138                             !br_vlan_can_enter_range(v, curr_end)) {
 139                                 br_vlan_notify(br, p, curr_start->vid,
 140                                                curr_end->vid, RTM_NEWVLAN);
 141                                 curr_start = v;
 142                         }
 143                         curr_end = v;
 144                 } else {
 145                         /* nothing changed and nothing to notify yet */
 146                         if (!curr_start)
 147                                 continue;
 148
 149                         br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
 150                                        RTM_NEWVLAN);
 151                         curr_start = NULL;
 152                         curr_end = NULL;
 153                 }
 154         }
 155         if (curr_start)
 156                 br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
 157                                RTM_NEWVLAN);
 158
 159         return err;
 160 }