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7a53e718 NA |
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 | { | |
a580c76d | 14 | return v1->state == v2->state; |
7a53e718 NA |
15 | } |
16 | ||
17 | bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v) | |
18 | { | |
a580c76d NA |
19 | return !nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE, |
20 | br_vlan_get_state(v)); | |
7a53e718 NA |
21 | } |
22 | ||
23 | size_t br_vlan_opts_nl_size(void) | |
24 | { | |
a580c76d NA |
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 | ||
7a53e718 NA |
62 | return 0; |
63 | } | |
a5d29ae2 NA |
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 | { | |
a580c76d NA |
73 | int err; |
74 | ||
a5d29ae2 | 75 | *changed = false; |
a580c76d NA |
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 | ||
a5d29ae2 NA |
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 | } |