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_deprecated(attr, IFLA_VLAN_QOS_MAX, 39 vlan_map_policy, 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 VLAN_FLAG_BRIDGE_BINDING)) { 89 NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); 90 return -EINVAL; 91 } 92 } 93 94 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 95 if (err < 0) { 96 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); 97 return err; 98 } 99 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 100 if (err < 0) { 101 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); 102 return err; 103 } 104 return 0; 105 } 106 107 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], 108 struct nlattr *data[], 109 struct netlink_ext_ack *extack) 110 { 111 struct ifla_vlan_flags *flags; 112 struct ifla_vlan_qos_mapping *m; 113 struct nlattr *attr; 114 int rem; 115 116 if (data[IFLA_VLAN_FLAGS]) { 117 flags = nla_data(data[IFLA_VLAN_FLAGS]); 118 vlan_dev_change_flags(dev, flags->flags, flags->mask); 119 } 120 if (data[IFLA_VLAN_INGRESS_QOS]) { 121 nla_for_each_nested(attr, 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(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 128 m = nla_data(attr); 129 vlan_dev_set_egress_priority(dev, m->from, m->to); 130 } 131 } 132 return 0; 133 } 134 135 static int vlan_newlink(struct net *src_net, struct net_device *dev, 136 struct nlattr *tb[], struct nlattr *data[], 137 struct netlink_ext_ack *extack) 138 { 139 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 140 struct net_device *real_dev; 141 unsigned int max_mtu; 142 __be16 proto; 143 int err; 144 145 if (!data[IFLA_VLAN_ID]) { 146 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); 147 return -EINVAL; 148 } 149 150 if (!tb[IFLA_LINK]) { 151 NL_SET_ERR_MSG_MOD(extack, "link not specified"); 152 return -EINVAL; 153 } 154 155 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 156 if (!real_dev) { 157 NL_SET_ERR_MSG_MOD(extack, "link does not exist"); 158 return -ENODEV; 159 } 160 161 if (data[IFLA_VLAN_PROTOCOL]) 162 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 163 else 164 proto = htons(ETH_P_8021Q); 165 166 vlan->vlan_proto = proto; 167 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 168 vlan->real_dev = real_dev; 169 dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 170 vlan->flags = VLAN_FLAG_REORDER_HDR; 171 172 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, 173 extack); 174 if (err < 0) 175 return err; 176 177 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 178 real_dev->mtu; 179 if (!tb[IFLA_MTU]) 180 dev->mtu = max_mtu; 181 else if (dev->mtu > max_mtu) 182 return -EINVAL; 183 184 err = vlan_changelink(dev, tb, data, extack); 185 if (err < 0) 186 return err; 187 188 return register_vlan_dev(dev, extack); 189 } 190 191 static inline size_t vlan_qos_map_size(unsigned int n) 192 { 193 if (n == 0) 194 return 0; 195 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 196 return nla_total_size(sizeof(struct nlattr)) + 197 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 198 } 199 200 static size_t vlan_get_size(const struct net_device *dev) 201 { 202 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 203 204 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 205 nla_total_size(2) + /* IFLA_VLAN_ID */ 206 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 207 vlan_qos_map_size(vlan->nr_ingress_mappings) + 208 vlan_qos_map_size(vlan->nr_egress_mappings); 209 } 210 211 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 212 { 213 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 214 struct vlan_priority_tci_mapping *pm; 215 struct ifla_vlan_flags f; 216 struct ifla_vlan_qos_mapping m; 217 struct nlattr *nest; 218 unsigned int i; 219 220 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 221 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 222 goto nla_put_failure; 223 if (vlan->flags) { 224 f.flags = vlan->flags; 225 f.mask = ~0; 226 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 227 goto nla_put_failure; 228 } 229 if (vlan->nr_ingress_mappings) { 230 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS); 231 if (nest == NULL) 232 goto nla_put_failure; 233 234 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 235 if (!vlan->ingress_priority_map[i]) 236 continue; 237 238 m.from = i; 239 m.to = vlan->ingress_priority_map[i]; 240 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 241 sizeof(m), &m)) 242 goto nla_put_failure; 243 } 244 nla_nest_end(skb, nest); 245 } 246 247 if (vlan->nr_egress_mappings) { 248 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS); 249 if (nest == NULL) 250 goto nla_put_failure; 251 252 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 253 for (pm = vlan->egress_priority_map[i]; pm; 254 pm = pm->next) { 255 if (!pm->vlan_qos) 256 continue; 257 258 m.from = pm->priority; 259 m.to = (pm->vlan_qos >> 13) & 0x7; 260 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 261 sizeof(m), &m)) 262 goto nla_put_failure; 263 } 264 } 265 nla_nest_end(skb, nest); 266 } 267 return 0; 268 269 nla_put_failure: 270 return -EMSGSIZE; 271 } 272 273 static struct net *vlan_get_link_net(const struct net_device *dev) 274 { 275 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 276 277 return dev_net(real_dev); 278 } 279 280 struct rtnl_link_ops vlan_link_ops __read_mostly = { 281 .kind = "vlan", 282 .maxtype = IFLA_VLAN_MAX, 283 .policy = vlan_policy, 284 .priv_size = sizeof(struct vlan_dev_priv), 285 .setup = vlan_setup, 286 .validate = vlan_validate, 287 .newlink = vlan_newlink, 288 .changelink = vlan_changelink, 289 .dellink = unregister_vlan_dev, 290 .get_size = vlan_get_size, 291 .fill_info = vlan_fill_info, 292 .get_link_net = vlan_get_link_net, 293 }; 294 295 int __init vlan_netlink_init(void) 296 { 297 return rtnl_link_register(&vlan_link_ops); 298 } 299 300 void __exit vlan_netlink_fini(void) 301 { 302 rtnl_link_unregister(&vlan_link_ops); 303 } 304 305 MODULE_ALIAS_RTNL_LINK("vlan"); 306