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 { 44 struct ifla_vlan_flags *flags; 45 u16 id; 46 int err; 47 48 if (tb[IFLA_ADDRESS]) { 49 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 50 return -EINVAL; 51 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 52 return -EADDRNOTAVAIL; 53 } 54 55 if (!data) 56 return -EINVAL; 57 58 if (data[IFLA_VLAN_PROTOCOL]) { 59 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { 60 case htons(ETH_P_8021Q): 61 case htons(ETH_P_8021AD): 62 break; 63 default: 64 return -EPROTONOSUPPORT; 65 } 66 } 67 68 if (data[IFLA_VLAN_ID]) { 69 id = nla_get_u16(data[IFLA_VLAN_ID]); 70 if (id >= VLAN_VID_MASK) 71 return -ERANGE; 72 } 73 if (data[IFLA_VLAN_FLAGS]) { 74 flags = nla_data(data[IFLA_VLAN_FLAGS]); 75 if ((flags->flags & flags->mask) & 76 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 77 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) 78 return -EINVAL; 79 } 80 81 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 82 if (err < 0) 83 return err; 84 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 85 if (err < 0) 86 return err; 87 return 0; 88 } 89 90 static int vlan_changelink(struct net_device *dev, 91 struct nlattr *tb[], struct nlattr *data[]) 92 { 93 struct ifla_vlan_flags *flags; 94 struct ifla_vlan_qos_mapping *m; 95 struct nlattr *attr; 96 int rem; 97 98 if (data[IFLA_VLAN_FLAGS]) { 99 flags = nla_data(data[IFLA_VLAN_FLAGS]); 100 vlan_dev_change_flags(dev, flags->flags, flags->mask); 101 } 102 if (data[IFLA_VLAN_INGRESS_QOS]) { 103 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 104 m = nla_data(attr); 105 vlan_dev_set_ingress_priority(dev, m->to, m->from); 106 } 107 } 108 if (data[IFLA_VLAN_EGRESS_QOS]) { 109 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 110 m = nla_data(attr); 111 vlan_dev_set_egress_priority(dev, m->from, m->to); 112 } 113 } 114 return 0; 115 } 116 117 static int vlan_newlink(struct net *src_net, struct net_device *dev, 118 struct nlattr *tb[], struct nlattr *data[], 119 struct netlink_ext_ack *extack) 120 { 121 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 122 struct net_device *real_dev; 123 unsigned int max_mtu; 124 __be16 proto; 125 int err; 126 127 if (!data[IFLA_VLAN_ID]) 128 return -EINVAL; 129 130 if (!tb[IFLA_LINK]) 131 return -EINVAL; 132 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 133 if (!real_dev) 134 return -ENODEV; 135 136 if (data[IFLA_VLAN_PROTOCOL]) 137 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 138 else 139 proto = htons(ETH_P_8021Q); 140 141 vlan->vlan_proto = proto; 142 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 143 vlan->real_dev = real_dev; 144 vlan->flags = VLAN_FLAG_REORDER_HDR; 145 146 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id); 147 if (err < 0) 148 return err; 149 150 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 151 real_dev->mtu; 152 if (!tb[IFLA_MTU]) 153 dev->mtu = max_mtu; 154 else if (dev->mtu > max_mtu) 155 return -EINVAL; 156 157 err = vlan_changelink(dev, tb, data); 158 if (err < 0) 159 return err; 160 161 return register_vlan_dev(dev); 162 } 163 164 static inline size_t vlan_qos_map_size(unsigned int n) 165 { 166 if (n == 0) 167 return 0; 168 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 169 return nla_total_size(sizeof(struct nlattr)) + 170 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 171 } 172 173 static size_t vlan_get_size(const struct net_device *dev) 174 { 175 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 176 177 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 178 nla_total_size(2) + /* IFLA_VLAN_ID */ 179 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 180 vlan_qos_map_size(vlan->nr_ingress_mappings) + 181 vlan_qos_map_size(vlan->nr_egress_mappings); 182 } 183 184 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 185 { 186 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 187 struct vlan_priority_tci_mapping *pm; 188 struct ifla_vlan_flags f; 189 struct ifla_vlan_qos_mapping m; 190 struct nlattr *nest; 191 unsigned int i; 192 193 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 194 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 195 goto nla_put_failure; 196 if (vlan->flags) { 197 f.flags = vlan->flags; 198 f.mask = ~0; 199 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 200 goto nla_put_failure; 201 } 202 if (vlan->nr_ingress_mappings) { 203 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 204 if (nest == NULL) 205 goto nla_put_failure; 206 207 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 208 if (!vlan->ingress_priority_map[i]) 209 continue; 210 211 m.from = i; 212 m.to = vlan->ingress_priority_map[i]; 213 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 214 sizeof(m), &m)) 215 goto nla_put_failure; 216 } 217 nla_nest_end(skb, nest); 218 } 219 220 if (vlan->nr_egress_mappings) { 221 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 222 if (nest == NULL) 223 goto nla_put_failure; 224 225 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 226 for (pm = vlan->egress_priority_map[i]; pm; 227 pm = pm->next) { 228 if (!pm->vlan_qos) 229 continue; 230 231 m.from = pm->priority; 232 m.to = (pm->vlan_qos >> 13) & 0x7; 233 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 234 sizeof(m), &m)) 235 goto nla_put_failure; 236 } 237 } 238 nla_nest_end(skb, nest); 239 } 240 return 0; 241 242 nla_put_failure: 243 return -EMSGSIZE; 244 } 245 246 static struct net *vlan_get_link_net(const struct net_device *dev) 247 { 248 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 249 250 return dev_net(real_dev); 251 } 252 253 struct rtnl_link_ops vlan_link_ops __read_mostly = { 254 .kind = "vlan", 255 .maxtype = IFLA_VLAN_MAX, 256 .policy = vlan_policy, 257 .priv_size = sizeof(struct vlan_dev_priv), 258 .setup = vlan_setup, 259 .validate = vlan_validate, 260 .newlink = vlan_newlink, 261 .changelink = vlan_changelink, 262 .dellink = unregister_vlan_dev, 263 .get_size = vlan_get_size, 264 .fill_info = vlan_fill_info, 265 .get_link_net = vlan_get_link_net, 266 }; 267 268 int __init vlan_netlink_init(void) 269 { 270 return rtnl_link_register(&vlan_link_ops); 271 } 272 273 void __exit vlan_netlink_fini(void) 274 { 275 rtnl_link_unregister(&vlan_link_ops); 276 } 277 278 MODULE_ALIAS_RTNL_LINK("vlan"); 279