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_type(attr, IFLA_VLAN_QOS_MAPPING, 121 data[IFLA_VLAN_INGRESS_QOS], rem) { 122 m = nla_data(attr); 123 vlan_dev_set_ingress_priority(dev, m->to, m->from); 124 } 125 } 126 if (data[IFLA_VLAN_EGRESS_QOS]) { 127 nla_for_each_nested_type(attr, IFLA_VLAN_QOS_MAPPING, 128 data[IFLA_VLAN_EGRESS_QOS], rem) { 129 m = nla_data(attr); 130 err = vlan_dev_set_egress_priority(dev, m->from, m->to); 131 if (err) 132 return err; 133 } 134 } 135 return 0; 136 } 137 138 static int vlan_newlink(struct net *src_net, struct net_device *dev, 139 struct nlattr *tb[], struct nlattr *data[], 140 struct netlink_ext_ack *extack) 141 { 142 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 143 struct net_device *real_dev; 144 unsigned int max_mtu; 145 __be16 proto; 146 int err; 147 148 if (!data[IFLA_VLAN_ID]) { 149 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); 150 return -EINVAL; 151 } 152 153 if (!tb[IFLA_LINK]) { 154 NL_SET_ERR_MSG_MOD(extack, "link not specified"); 155 return -EINVAL; 156 } 157 158 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 159 if (!real_dev) { 160 NL_SET_ERR_MSG_MOD(extack, "link does not exist"); 161 return -ENODEV; 162 } 163 164 if (data[IFLA_VLAN_PROTOCOL]) 165 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 166 else 167 proto = htons(ETH_P_8021Q); 168 169 vlan->vlan_proto = proto; 170 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 171 vlan->real_dev = real_dev; 172 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 173 vlan->flags = VLAN_FLAG_REORDER_HDR; 174 175 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, 176 extack); 177 if (err < 0) 178 return err; 179 180 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 181 real_dev->mtu; 182 if (!tb[IFLA_MTU]) 183 dev->mtu = max_mtu; 184 else if (dev->mtu > max_mtu) 185 return -EINVAL; 186 187 /* Note: If this initial vlan_changelink() fails, we need 188 * to call vlan_dev_free_egress_priority() to free memory. 189 */ 190 err = vlan_changelink(dev, tb, data, extack); 191 192 if (!err) 193 err = register_vlan_dev(dev, extack); 194 195 if (err) 196 vlan_dev_free_egress_priority(dev); 197 return err; 198 } 199 200 static inline size_t vlan_qos_map_size(unsigned int n) 201 { 202 if (n == 0) 203 return 0; 204 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 205 return nla_total_size(sizeof(struct nlattr)) + 206 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 207 } 208 209 static size_t vlan_get_size(const struct net_device *dev) 210 { 211 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 212 213 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 214 nla_total_size(2) + /* IFLA_VLAN_ID */ 215 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 216 vlan_qos_map_size(vlan->nr_ingress_mappings) + 217 vlan_qos_map_size(vlan->nr_egress_mappings); 218 } 219 220 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 221 { 222 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 223 struct vlan_priority_tci_mapping *pm; 224 struct ifla_vlan_flags f; 225 struct ifla_vlan_qos_mapping m; 226 struct nlattr *nest; 227 unsigned int i; 228 229 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 230 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 231 goto nla_put_failure; 232 if (vlan->flags) { 233 f.flags = vlan->flags; 234 f.mask = ~0; 235 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 236 goto nla_put_failure; 237 } 238 if (vlan->nr_ingress_mappings) { 239 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS); 240 if (nest == NULL) 241 goto nla_put_failure; 242 243 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 244 if (!vlan->ingress_priority_map[i]) 245 continue; 246 247 m.from = i; 248 m.to = vlan->ingress_priority_map[i]; 249 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 250 sizeof(m), &m)) 251 goto nla_put_failure; 252 } 253 nla_nest_end(skb, nest); 254 } 255 256 if (vlan->nr_egress_mappings) { 257 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS); 258 if (nest == NULL) 259 goto nla_put_failure; 260 261 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 262 for (pm = vlan->egress_priority_map[i]; pm; 263 pm = pm->next) { 264 if (!pm->vlan_qos) 265 continue; 266 267 m.from = pm->priority; 268 m.to = (pm->vlan_qos >> 13) & 0x7; 269 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 270 sizeof(m), &m)) 271 goto nla_put_failure; 272 } 273 } 274 nla_nest_end(skb, nest); 275 } 276 return 0; 277 278 nla_put_failure: 279 return -EMSGSIZE; 280 } 281 282 static struct net *vlan_get_link_net(const struct net_device *dev) 283 { 284 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 285 286 return dev_net(real_dev); 287 } 288 289 struct rtnl_link_ops vlan_link_ops __read_mostly = { 290 .kind = "vlan", 291 .maxtype = IFLA_VLAN_MAX, 292 .policy = vlan_policy, 293 .priv_size = sizeof(struct vlan_dev_priv), 294 .setup = vlan_setup, 295 .validate = vlan_validate, 296 .newlink = vlan_newlink, 297 .changelink = vlan_changelink, 298 .dellink = unregister_vlan_dev, 299 .get_size = vlan_get_size, 300 .fill_info = vlan_fill_info, 301 .get_link_net = vlan_get_link_net, 302 }; 303 304 int __init vlan_netlink_init(void) 305 { 306 return rtnl_link_register(&vlan_link_ops); 307 } 308 309 void __exit vlan_netlink_fini(void) 310 { 311 rtnl_link_unregister(&vlan_link_ops); 312 } 313 314 MODULE_ALIAS_RTNL_LINK("vlan"); 315