|
| 1 | +/* |
| 2 | + * VLAN netlink control interface |
| 3 | + * |
| 4 | + * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> |
| 5 | + * |
| 6 | + * This program is free software; you can redistribute it and/or |
| 7 | + * modify it under the terms of the GNU General Public License |
| 8 | + * version 2 as published by the Free Software Foundation. |
| 9 | + */ |
| 10 | + |
| 11 | +#include <linux/kernel.h> |
| 12 | +#include <linux/netdevice.h> |
| 13 | +#include <linux/if_vlan.h> |
| 14 | +#include <net/netlink.h> |
| 15 | +#include <net/rtnetlink.h> |
| 16 | +#include "vlan.h" |
| 17 | + |
| 18 | + |
| 19 | +static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { |
| 20 | + [IFLA_VLAN_ID] = { .type = NLA_U16 }, |
| 21 | + [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, |
| 22 | + [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, |
| 23 | + [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, |
| 24 | +}; |
| 25 | + |
| 26 | +static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { |
| 27 | + [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, |
| 28 | +}; |
| 29 | + |
| 30 | + |
| 31 | +static inline int vlan_validate_qos_map(struct nlattr *attr) |
| 32 | +{ |
| 33 | + if (!attr) |
| 34 | + return 0; |
| 35 | + return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy); |
| 36 | +} |
| 37 | + |
| 38 | +static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 39 | +{ |
| 40 | + struct ifla_vlan_flags *flags; |
| 41 | + u16 id; |
| 42 | + int err; |
| 43 | + |
| 44 | + if (!data) |
| 45 | + return -EINVAL; |
| 46 | + |
| 47 | + if (data[IFLA_VLAN_ID]) { |
| 48 | + id = nla_get_u16(data[IFLA_VLAN_ID]); |
| 49 | + if (id >= VLAN_VID_MASK) |
| 50 | + return -ERANGE; |
| 51 | + } |
| 52 | + if (data[IFLA_VLAN_FLAGS]) { |
| 53 | + flags = nla_data(data[IFLA_VLAN_FLAGS]); |
| 54 | + if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR) |
| 55 | + return -EINVAL; |
| 56 | + } |
| 57 | + |
| 58 | + err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); |
| 59 | + if (err < 0) |
| 60 | + return err; |
| 61 | + err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); |
| 62 | + if (err < 0) |
| 63 | + return err; |
| 64 | + return 0; |
| 65 | +} |
| 66 | + |
| 67 | +static int vlan_changelink(struct net_device *dev, |
| 68 | + struct nlattr *tb[], struct nlattr *data[]) |
| 69 | +{ |
| 70 | + struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); |
| 71 | + struct ifla_vlan_flags *flags; |
| 72 | + struct ifla_vlan_qos_mapping *m; |
| 73 | + struct nlattr *attr; |
| 74 | + int rem; |
| 75 | + |
| 76 | + if (data[IFLA_VLAN_FLAGS]) { |
| 77 | + flags = nla_data(data[IFLA_VLAN_FLAGS]); |
| 78 | + vlan->flags = (vlan->flags & ~flags->mask) | |
| 79 | + (flags->flags & flags->mask); |
| 80 | + } |
| 81 | + if (data[IFLA_VLAN_INGRESS_QOS]) { |
| 82 | + nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { |
| 83 | + m = nla_data(attr); |
| 84 | + vlan_dev_set_ingress_priority(dev, m->to, m->from); |
| 85 | + } |
| 86 | + } |
| 87 | + if (data[IFLA_VLAN_EGRESS_QOS]) { |
| 88 | + nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { |
| 89 | + m = nla_data(attr); |
| 90 | + vlan_dev_set_egress_priority(dev, m->from, m->to); |
| 91 | + } |
| 92 | + } |
| 93 | + return 0; |
| 94 | +} |
| 95 | + |
| 96 | +static int vlan_newlink(struct net_device *dev, |
| 97 | + struct nlattr *tb[], struct nlattr *data[]) |
| 98 | +{ |
| 99 | + struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); |
| 100 | + struct net_device *real_dev; |
| 101 | + int err; |
| 102 | + |
| 103 | + if (!data[IFLA_VLAN_ID]) |
| 104 | + return -EINVAL; |
| 105 | + |
| 106 | + if (!tb[IFLA_LINK]) |
| 107 | + return -EINVAL; |
| 108 | + real_dev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK])); |
| 109 | + if (!real_dev) |
| 110 | + return -ENODEV; |
| 111 | + |
| 112 | + vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
| 113 | + vlan->real_dev = real_dev; |
| 114 | + vlan->flags = VLAN_FLAG_REORDER_HDR; |
| 115 | + |
| 116 | + err = vlan_check_real_dev(real_dev, vlan->vlan_id); |
| 117 | + if (err < 0) |
| 118 | + return err; |
| 119 | + |
| 120 | + if (!tb[IFLA_MTU]) |
| 121 | + dev->mtu = real_dev->mtu; |
| 122 | + else if (dev->mtu > real_dev->mtu) |
| 123 | + return -EINVAL; |
| 124 | + |
| 125 | + err = vlan_changelink(dev, tb, data); |
| 126 | + if (err < 0) |
| 127 | + return err; |
| 128 | + |
| 129 | + return register_vlan_dev(dev); |
| 130 | +} |
| 131 | + |
| 132 | +static void vlan_dellink(struct net_device *dev) |
| 133 | +{ |
| 134 | + unregister_vlan_device(dev); |
| 135 | +} |
| 136 | + |
| 137 | +static inline size_t vlan_qos_map_size(unsigned int n) |
| 138 | +{ |
| 139 | + if (n == 0) |
| 140 | + return 0; |
| 141 | + /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ |
| 142 | + return nla_total_size(sizeof(struct nlattr)) + |
| 143 | + nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; |
| 144 | +} |
| 145 | + |
| 146 | +static size_t vlan_get_size(const struct net_device *dev) |
| 147 | +{ |
| 148 | + struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); |
| 149 | + |
| 150 | + return nla_total_size(2) + /* IFLA_VLAN_ID */ |
| 151 | + vlan_qos_map_size(vlan->nr_ingress_mappings) + |
| 152 | + vlan_qos_map_size(vlan->nr_egress_mappings); |
| 153 | +} |
| 154 | + |
| 155 | +static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 156 | +{ |
| 157 | + struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); |
| 158 | + struct vlan_priority_tci_mapping *pm; |
| 159 | + struct ifla_vlan_flags f; |
| 160 | + struct ifla_vlan_qos_mapping m; |
| 161 | + struct nlattr *nest; |
| 162 | + unsigned int i; |
| 163 | + |
| 164 | + NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id); |
| 165 | + if (vlan->flags) { |
| 166 | + f.flags = vlan->flags; |
| 167 | + f.mask = ~0; |
| 168 | + NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); |
| 169 | + } |
| 170 | + if (vlan->nr_ingress_mappings) { |
| 171 | + nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); |
| 172 | + if (nest == NULL) |
| 173 | + goto nla_put_failure; |
| 174 | + |
| 175 | + for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { |
| 176 | + if (!vlan->ingress_priority_map[i]) |
| 177 | + continue; |
| 178 | + |
| 179 | + m.from = i; |
| 180 | + m.to = vlan->ingress_priority_map[i]; |
| 181 | + NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, |
| 182 | + sizeof(m), &m); |
| 183 | + } |
| 184 | + nla_nest_end(skb, nest); |
| 185 | + } |
| 186 | + |
| 187 | + if (vlan->nr_egress_mappings) { |
| 188 | + nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); |
| 189 | + if (nest == NULL) |
| 190 | + goto nla_put_failure; |
| 191 | + |
| 192 | + for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { |
| 193 | + for (pm = vlan->egress_priority_map[i]; pm; |
| 194 | + pm = pm->next) { |
| 195 | + if (!pm->vlan_qos) |
| 196 | + continue; |
| 197 | + |
| 198 | + m.from = pm->priority; |
| 199 | + m.to = (pm->vlan_qos >> 13) & 0x7; |
| 200 | + NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, |
| 201 | + sizeof(m), &m); |
| 202 | + } |
| 203 | + } |
| 204 | + nla_nest_end(skb, nest); |
| 205 | + } |
| 206 | + return 0; |
| 207 | + |
| 208 | +nla_put_failure: |
| 209 | + return -EMSGSIZE; |
| 210 | +} |
| 211 | + |
| 212 | +struct rtnl_link_ops vlan_link_ops __read_mostly = { |
| 213 | + .kind = "vlan", |
| 214 | + .maxtype = IFLA_VLAN_MAX, |
| 215 | + .policy = vlan_policy, |
| 216 | + .priv_size = sizeof(struct vlan_dev_info), |
| 217 | + .setup = vlan_setup, |
| 218 | + .validate = vlan_validate, |
| 219 | + .newlink = vlan_newlink, |
| 220 | + .changelink = vlan_changelink, |
| 221 | + .dellink = vlan_dellink, |
| 222 | + .get_size = vlan_get_size, |
| 223 | + .fill_info = vlan_fill_info, |
| 224 | +}; |
| 225 | + |
| 226 | +int __init vlan_netlink_init(void) |
| 227 | +{ |
| 228 | + return rtnl_link_register(&vlan_link_ops); |
| 229 | +} |
| 230 | + |
| 231 | +void __exit vlan_netlink_fini(void) |
| 232 | +{ |
| 233 | + rtnl_link_unregister(&vlan_link_ops); |
| 234 | +} |
| 235 | + |
| 236 | +MODULE_ALIAS_RTNL_LINK("vlan"); |
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