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 <linux/module.h> 15 #include <net/net_namespace.h> 16 #include <net/netlink.h> 17 #include <net/rtnetlink.h> 18 #include "vlan.h" 19 20 21 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { 22 [IFLA_VLAN_ID] = { .type = NLA_U16 }, 23 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, 24 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, 25 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, 26 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, 27 }; 28 29 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { 30 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, 31 }; 32 33 34 static inline int vlan_validate_qos_map(struct nlattr *attr) 35 { 36 if (!attr) 37 return 0; 38 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy, 39 NULL); 40 } 41 42 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], 43 struct netlink_ext_ack *extack) 44 { 45 struct ifla_vlan_flags *flags; 46 u16 id; 47 int err; 48 49 if (tb[IFLA_ADDRESS]) { 50 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 51 return -EINVAL; 52 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 53 return -EADDRNOTAVAIL; 54 } 55 56 if (!data) 57 return -EINVAL; 58 59 if (data[IFLA_VLAN_PROTOCOL]) { 60 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { 61 case htons(ETH_P_8021Q): 62 case htons(ETH_P_8021AD): 63 break; 64 default: 65 return -EPROTONOSUPPORT; 66 } 67 } 68 69 if (data[IFLA_VLAN_ID]) { 70 id = nla_get_u16(data[IFLA_VLAN_ID]); 71 if (id >= VLAN_VID_MASK) 72 return -ERANGE; 73 } 74 if (data[IFLA_VLAN_FLAGS]) { 75 flags = nla_data(data[IFLA_VLAN_FLAGS]); 76 if ((flags->flags & flags->mask) & 77 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 78 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) 79 return -EINVAL; 80 } 81 82 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 83 if (err < 0) 84 return err; 85 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 86 if (err < 0) 87 return err; 88 return 0; 89 } 90 91 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], 92 struct nlattr *data[], 93 struct netlink_ext_ack *extack) 94 { 95 struct ifla_vlan_flags *flags; 96 struct ifla_vlan_qos_mapping *m; 97 struct nlattr *attr; 98 int rem; 99 100 if (data[IFLA_VLAN_FLAGS]) { 101 flags = nla_data(data[IFLA_VLAN_FLAGS]); 102 vlan_dev_change_flags(dev, flags->flags, flags->mask); 103 } 104 if (data[IFLA_VLAN_INGRESS_QOS]) { 105 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 106 m = nla_data(attr); 107 vlan_dev_set_ingress_priority(dev, m->to, m->from); 108 } 109 } 110 if (data[IFLA_VLAN_EGRESS_QOS]) { 111 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 112 m = nla_data(attr); 113 vlan_dev_set_egress_priority(dev, m->from, m->to); 114 } 115 } 116 return 0; 117 } 118 119 static int vlan_newlink(struct net *src_net, struct net_device *dev, 120 struct nlattr *tb[], struct nlattr *data[], 121 struct netlink_ext_ack *extack) 122 { 123 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 124 struct net_device *real_dev; 125 unsigned int max_mtu; 126 __be16 proto; 127 int err; 128 129 if (!data[IFLA_VLAN_ID]) 130 return -EINVAL; 131 132 if (!tb[IFLA_LINK]) 133 return -EINVAL; 134 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 135 if (!real_dev) 136 return -ENODEV; 137 138 if (data[IFLA_VLAN_PROTOCOL]) 139 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 140 else 141 proto = htons(ETH_P_8021Q); 142 143 vlan->vlan_proto = proto; 144 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 145 vlan->real_dev = real_dev; 146 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 147 vlan->flags = VLAN_FLAG_REORDER_HDR; 148 149 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id); 150 if (err < 0) 151 return err; 152 153 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 154 real_dev->mtu; 155 if (!tb[IFLA_MTU]) 156 dev->mtu = max_mtu; 157 else if (dev->mtu > max_mtu) 158 return -EINVAL; 159 160 err = vlan_changelink(dev, tb, data, extack); 161 if (err < 0) 162 return err; 163 164 return register_vlan_dev(dev, extack); 165 } 166 167 static inline size_t vlan_qos_map_size(unsigned int n) 168 { 169 if (n == 0) 170 return 0; 171 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 172 return nla_total_size(sizeof(struct nlattr)) + 173 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 174 } 175 176 static size_t vlan_get_size(const struct net_device *dev) 177 { 178 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 179 180 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 181 nla_total_size(2) + /* IFLA_VLAN_ID */ 182 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 183 vlan_qos_map_size(vlan->nr_ingress_mappings) + 184 vlan_qos_map_size(vlan->nr_egress_mappings); 185 } 186 187 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 188 { 189 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 190 struct vlan_priority_tci_mapping *pm; 191 struct ifla_vlan_flags f; 192 struct ifla_vlan_qos_mapping m; 193 struct nlattr *nest; 194 unsigned int i; 195 196 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 197 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 198 goto nla_put_failure; 199 if (vlan->flags) { 200 f.flags = vlan->flags; 201 f.mask = ~0; 202 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 203 goto nla_put_failure; 204 } 205 if (vlan->nr_ingress_mappings) { 206 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 207 if (nest == NULL) 208 goto nla_put_failure; 209 210 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 211 if (!vlan->ingress_priority_map[i]) 212 continue; 213 214 m.from = i; 215 m.to = vlan->ingress_priority_map[i]; 216 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 217 sizeof(m), &m)) 218 goto nla_put_failure; 219 } 220 nla_nest_end(skb, nest); 221 } 222 223 if (vlan->nr_egress_mappings) { 224 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 225 if (nest == NULL) 226 goto nla_put_failure; 227 228 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 229 for (pm = vlan->egress_priority_map[i]; pm; 230 pm = pm->next) { 231 if (!pm->vlan_qos) 232 continue; 233 234 m.from = pm->priority; 235 m.to = (pm->vlan_qos >> 13) & 0x7; 236 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 237 sizeof(m), &m)) 238 goto nla_put_failure; 239 } 240 } 241 nla_nest_end(skb, nest); 242 } 243 return 0; 244 245 nla_put_failure: 246 return -EMSGSIZE; 247 } 248 249 static struct net *vlan_get_link_net(const struct net_device *dev) 250 { 251 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 252 253 return dev_net(real_dev); 254 } 255 256 struct rtnl_link_ops vlan_link_ops __read_mostly = { 257 .kind = "vlan", 258 .maxtype = IFLA_VLAN_MAX, 259 .policy = vlan_policy, 260 .priv_size = sizeof(struct vlan_dev_priv), 261 .setup = vlan_setup, 262 .validate = vlan_validate, 263 .newlink = vlan_newlink, 264 .changelink = vlan_changelink, 265 .dellink = unregister_vlan_dev, 266 .get_size = vlan_get_size, 267 .fill_info = vlan_fill_info, 268 .get_link_net = vlan_get_link_net, 269 }; 270 271 int __init vlan_netlink_init(void) 272 { 273 return rtnl_link_register(&vlan_link_ops); 274 } 275 276 void __exit vlan_netlink_fini(void) 277 { 278 rtnl_link_unregister(&vlan_link_ops); 279 } 280 281 MODULE_ALIAS_RTNL_LINK("vlan"); 282