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 NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); 52 return -EINVAL; 53 } 54 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 55 NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); 56 return -EADDRNOTAVAIL; 57 } 58 } 59 60 if (!data) { 61 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); 62 return -EINVAL; 63 } 64 65 if (data[IFLA_VLAN_PROTOCOL]) { 66 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { 67 case htons(ETH_P_8021Q): 68 case htons(ETH_P_8021AD): 69 break; 70 default: 71 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); 72 return -EPROTONOSUPPORT; 73 } 74 } 75 76 if (data[IFLA_VLAN_ID]) { 77 id = nla_get_u16(data[IFLA_VLAN_ID]); 78 if (id >= VLAN_VID_MASK) { 79 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); 80 return -ERANGE; 81 } 82 } 83 if (data[IFLA_VLAN_FLAGS]) { 84 flags = nla_data(data[IFLA_VLAN_FLAGS]); 85 if ((flags->flags & flags->mask) & 86 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 87 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) { 88 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); 89 return -EINVAL; 90 } 91 } 92 93 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 94 if (err < 0) { 95 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); 96 return err; 97 } 98 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 99 if (err < 0) { 100 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); 101 return err; 102 } 103 return 0; 104 } 105 106 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], 107 struct nlattr *data[], 108 struct netlink_ext_ack *extack) 109 { 110 struct ifla_vlan_flags *flags; 111 struct ifla_vlan_qos_mapping *m; 112 struct nlattr *attr; 113 int rem; 114 115 if (data[IFLA_VLAN_FLAGS]) { 116 flags = nla_data(data[IFLA_VLAN_FLAGS]); 117 vlan_dev_change_flags(dev, flags->flags, flags->mask); 118 } 119 if (data[IFLA_VLAN_INGRESS_QOS]) { 120 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 121 m = nla_data(attr); 122 vlan_dev_set_ingress_priority(dev, m->to, m->from); 123 } 124 } 125 if (data[IFLA_VLAN_EGRESS_QOS]) { 126 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 127 m = nla_data(attr); 128 vlan_dev_set_egress_priority(dev, m->from, m->to); 129 } 130 } 131 return 0; 132 } 133 134 static int vlan_newlink(struct net *src_net, struct net_device *dev, 135 struct nlattr *tb[], struct nlattr *data[], 136 struct netlink_ext_ack *extack) 137 { 138 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 139 struct net_device *real_dev; 140 unsigned int max_mtu; 141 __be16 proto; 142 int err; 143 144 if (!data[IFLA_VLAN_ID]) { 145 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); 146 return -EINVAL; 147 } 148 149 if (!tb[IFLA_LINK]) { 150 NL_SET_ERR_MSG_MOD(extack, "link not specified"); 151 return -EINVAL; 152 } 153 154 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 155 if (!real_dev) { 156 NL_SET_ERR_MSG_MOD(extack, "link does not exist"); 157 return -ENODEV; 158 } 159 160 if (data[IFLA_VLAN_PROTOCOL]) 161 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 162 else 163 proto = htons(ETH_P_8021Q); 164 165 vlan->vlan_proto = proto; 166 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 167 vlan->real_dev = real_dev; 168 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 169 vlan->flags = VLAN_FLAG_REORDER_HDR; 170 171 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, 172 extack); 173 if (err < 0) 174 return err; 175 176 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 177 real_dev->mtu; 178 if (!tb[IFLA_MTU]) 179 dev->mtu = max_mtu; 180 else if (dev->mtu > max_mtu) 181 return -EINVAL; 182 183 err = vlan_changelink(dev, tb, data, extack); 184 if (err < 0) 185 return err; 186 187 return register_vlan_dev(dev, extack); 188 } 189 190 static inline size_t vlan_qos_map_size(unsigned int n) 191 { 192 if (n == 0) 193 return 0; 194 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 195 return nla_total_size(sizeof(struct nlattr)) + 196 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 197 } 198 199 static size_t vlan_get_size(const struct net_device *dev) 200 { 201 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 202 203 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 204 nla_total_size(2) + /* IFLA_VLAN_ID */ 205 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 206 vlan_qos_map_size(vlan->nr_ingress_mappings) + 207 vlan_qos_map_size(vlan->nr_egress_mappings); 208 } 209 210 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 211 { 212 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 213 struct vlan_priority_tci_mapping *pm; 214 struct ifla_vlan_flags f; 215 struct ifla_vlan_qos_mapping m; 216 struct nlattr *nest; 217 unsigned int i; 218 219 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 220 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 221 goto nla_put_failure; 222 if (vlan->flags) { 223 f.flags = vlan->flags; 224 f.mask = ~0; 225 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 226 goto nla_put_failure; 227 } 228 if (vlan->nr_ingress_mappings) { 229 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 230 if (nest == NULL) 231 goto nla_put_failure; 232 233 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 234 if (!vlan->ingress_priority_map[i]) 235 continue; 236 237 m.from = i; 238 m.to = vlan->ingress_priority_map[i]; 239 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 240 sizeof(m), &m)) 241 goto nla_put_failure; 242 } 243 nla_nest_end(skb, nest); 244 } 245 246 if (vlan->nr_egress_mappings) { 247 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 248 if (nest == NULL) 249 goto nla_put_failure; 250 251 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 252 for (pm = vlan->egress_priority_map[i]; pm; 253 pm = pm->next) { 254 if (!pm->vlan_qos) 255 continue; 256 257 m.from = pm->priority; 258 m.to = (pm->vlan_qos >> 13) & 0x7; 259 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 260 sizeof(m), &m)) 261 goto nla_put_failure; 262 } 263 } 264 nla_nest_end(skb, nest); 265 } 266 return 0; 267 268 nla_put_failure: 269 return -EMSGSIZE; 270 } 271 272 static struct net *vlan_get_link_net(const struct net_device *dev) 273 { 274 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 275 276 return dev_net(real_dev); 277 } 278 279 struct rtnl_link_ops vlan_link_ops __read_mostly = { 280 .kind = "vlan", 281 .maxtype = IFLA_VLAN_MAX, 282 .policy = vlan_policy, 283 .priv_size = sizeof(struct vlan_dev_priv), 284 .setup = vlan_setup, 285 .validate = vlan_validate, 286 .newlink = vlan_newlink, 287 .changelink = vlan_changelink, 288 .dellink = unregister_vlan_dev, 289 .get_size = vlan_get_size, 290 .fill_info = vlan_fill_info, 291 .get_link_net = vlan_get_link_net, 292 }; 293 294 int __init vlan_netlink_init(void) 295 { 296 return rtnl_link_register(&vlan_link_ops); 297 } 298 299 void __exit vlan_netlink_fini(void) 300 { 301 rtnl_link_unregister(&vlan_link_ops); 302 } 303 304 MODULE_ALIAS_RTNL_LINK("vlan"); 305