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