1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VLAN netlink control interface 4 * 5 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/netdevice.h> 10 #include <linux/if_vlan.h> 11 #include <linux/module.h> 12 #include <net/net_namespace.h> 13 #include <net/netlink.h> 14 #include <net/rtnetlink.h> 15 #include "vlan.h" 16 17 18 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { 19 [IFLA_VLAN_ID] = { .type = NLA_U16 }, 20 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, 21 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, 22 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, 23 [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, 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_deprecated(attr, IFLA_VLAN_QOS_MAX, 36 vlan_map_policy, NULL); 37 } 38 39 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], 40 struct netlink_ext_ack *extack) 41 { 42 struct ifla_vlan_flags *flags; 43 u16 id; 44 int err; 45 46 if (tb[IFLA_ADDRESS]) { 47 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 48 NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); 49 return -EINVAL; 50 } 51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 52 NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); 53 return -EADDRNOTAVAIL; 54 } 55 } 56 57 if (!data) { 58 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); 59 return -EINVAL; 60 } 61 62 if (data[IFLA_VLAN_PROTOCOL]) { 63 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { 64 case htons(ETH_P_8021Q): 65 case htons(ETH_P_8021AD): 66 break; 67 default: 68 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); 69 return -EPROTONOSUPPORT; 70 } 71 } 72 73 if (data[IFLA_VLAN_ID]) { 74 id = nla_get_u16(data[IFLA_VLAN_ID]); 75 if (id >= VLAN_VID_MASK) { 76 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); 77 return -ERANGE; 78 } 79 } 80 if (data[IFLA_VLAN_FLAGS]) { 81 flags = nla_data(data[IFLA_VLAN_FLAGS]); 82 if ((flags->flags & flags->mask) & 83 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 84 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 85 VLAN_FLAG_BRIDGE_BINDING)) { 86 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); 87 return -EINVAL; 88 } 89 } 90 91 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 92 if (err < 0) { 93 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); 94 return err; 95 } 96 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 97 if (err < 0) { 98 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); 99 return err; 100 } 101 return 0; 102 } 103 104 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], 105 struct nlattr *data[], 106 struct netlink_ext_ack *extack) 107 { 108 struct ifla_vlan_flags *flags; 109 struct ifla_vlan_qos_mapping *m; 110 struct nlattr *attr; 111 int rem, err; 112 113 if (data[IFLA_VLAN_FLAGS]) { 114 flags = nla_data(data[IFLA_VLAN_FLAGS]); 115 err = vlan_dev_change_flags(dev, flags->flags, flags->mask); 116 if (err) 117 return err; 118 } 119 if (data[IFLA_VLAN_INGRESS_QOS]) { 120 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 121 if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) 122 continue; 123 m = nla_data(attr); 124 vlan_dev_set_ingress_priority(dev, m->to, m->from); 125 } 126 } 127 if (data[IFLA_VLAN_EGRESS_QOS]) { 128 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 129 if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) 130 continue; 131 m = nla_data(attr); 132 err = vlan_dev_set_egress_priority(dev, m->from, m->to); 133 if (err) 134 return err; 135 } 136 } 137 return 0; 138 } 139 140 static int vlan_newlink(struct net *src_net, struct net_device *dev, 141 struct nlattr *tb[], struct nlattr *data[], 142 struct netlink_ext_ack *extack) 143 { 144 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 145 struct net_device *real_dev; 146 unsigned int max_mtu; 147 __be16 proto; 148 int err; 149 150 if (!data[IFLA_VLAN_ID]) { 151 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); 152 return -EINVAL; 153 } 154 155 if (!tb[IFLA_LINK]) { 156 NL_SET_ERR_MSG_MOD(extack, "link not specified"); 157 return -EINVAL; 158 } 159 160 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 161 if (!real_dev) { 162 NL_SET_ERR_MSG_MOD(extack, "link does not exist"); 163 return -ENODEV; 164 } 165 166 if (data[IFLA_VLAN_PROTOCOL]) 167 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 168 else 169 proto = htons(ETH_P_8021Q); 170 171 vlan->vlan_proto = proto; 172 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 173 vlan->real_dev = real_dev; 174 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 175 vlan->flags = VLAN_FLAG_REORDER_HDR; 176 177 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, 178 extack); 179 if (err < 0) 180 return err; 181 182 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 183 real_dev->mtu; 184 if (!tb[IFLA_MTU]) 185 dev->mtu = max_mtu; 186 else if (dev->mtu > max_mtu) 187 return -EINVAL; 188 189 /* Note: If this initial vlan_changelink() fails, we need 190 * to call vlan_dev_free_egress_priority() to free memory. 191 */ 192 err = vlan_changelink(dev, tb, data, extack); 193 194 if (!err) 195 err = register_vlan_dev(dev, extack); 196 197 if (err) 198 vlan_dev_free_egress_priority(dev); 199 return err; 200 } 201 202 static inline size_t vlan_qos_map_size(unsigned int n) 203 { 204 if (n == 0) 205 return 0; 206 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 207 return nla_total_size(sizeof(struct nlattr)) + 208 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 209 } 210 211 static size_t vlan_get_size(const struct net_device *dev) 212 { 213 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 214 215 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 216 nla_total_size(2) + /* IFLA_VLAN_ID */ 217 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 218 vlan_qos_map_size(vlan->nr_ingress_mappings) + 219 vlan_qos_map_size(vlan->nr_egress_mappings); 220 } 221 222 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 223 { 224 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 225 struct vlan_priority_tci_mapping *pm; 226 struct ifla_vlan_flags f; 227 struct ifla_vlan_qos_mapping m; 228 struct nlattr *nest; 229 unsigned int i; 230 231 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 232 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 233 goto nla_put_failure; 234 if (vlan->flags) { 235 f.flags = vlan->flags; 236 f.mask = ~0; 237 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 238 goto nla_put_failure; 239 } 240 if (vlan->nr_ingress_mappings) { 241 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS); 242 if (nest == NULL) 243 goto nla_put_failure; 244 245 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 246 if (!vlan->ingress_priority_map[i]) 247 continue; 248 249 m.from = i; 250 m.to = vlan->ingress_priority_map[i]; 251 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 252 sizeof(m), &m)) 253 goto nla_put_failure; 254 } 255 nla_nest_end(skb, nest); 256 } 257 258 if (vlan->nr_egress_mappings) { 259 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS); 260 if (nest == NULL) 261 goto nla_put_failure; 262 263 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 264 for (pm = vlan->egress_priority_map[i]; pm; 265 pm = pm->next) { 266 if (!pm->vlan_qos) 267 continue; 268 269 m.from = pm->priority; 270 m.to = (pm->vlan_qos >> 13) & 0x7; 271 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 272 sizeof(m), &m)) 273 goto nla_put_failure; 274 } 275 } 276 nla_nest_end(skb, nest); 277 } 278 return 0; 279 280 nla_put_failure: 281 return -EMSGSIZE; 282 } 283 284 static struct net *vlan_get_link_net(const struct net_device *dev) 285 { 286 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 287 288 return dev_net(real_dev); 289 } 290 291 struct rtnl_link_ops vlan_link_ops __read_mostly = { 292 .kind = "vlan", 293 .maxtype = IFLA_VLAN_MAX, 294 .policy = vlan_policy, 295 .priv_size = sizeof(struct vlan_dev_priv), 296 .setup = vlan_setup, 297 .validate = vlan_validate, 298 .newlink = vlan_newlink, 299 .changelink = vlan_changelink, 300 .dellink = unregister_vlan_dev, 301 .get_size = vlan_get_size, 302 .fill_info = vlan_fill_info, 303 .get_link_net = vlan_get_link_net, 304 }; 305 306 int __init vlan_netlink_init(void) 307 { 308 return rtnl_link_register(&vlan_link_ops); 309 } 310 311 void __exit vlan_netlink_fini(void) 312 { 313 rtnl_link_unregister(&vlan_link_ops); 314 } 315 316 MODULE_ALIAS_RTNL_LINK("vlan"); 317