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 { 120 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 121 struct net_device *real_dev; 122 unsigned int max_mtu; 123 __be16 proto; 124 int err; 125 126 if (!data[IFLA_VLAN_ID]) 127 return -EINVAL; 128 129 if (!tb[IFLA_LINK]) 130 return -EINVAL; 131 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 132 if (!real_dev) 133 return -ENODEV; 134 135 if (data[IFLA_VLAN_PROTOCOL]) 136 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 137 else 138 proto = htons(ETH_P_8021Q); 139 140 vlan->vlan_proto = proto; 141 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 142 vlan->real_dev = real_dev; 143 vlan->flags = VLAN_FLAG_REORDER_HDR; 144 145 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id); 146 if (err < 0) 147 return err; 148 149 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 150 real_dev->mtu; 151 if (!tb[IFLA_MTU]) 152 dev->mtu = max_mtu; 153 else if (dev->mtu > max_mtu) 154 return -EINVAL; 155 156 err = vlan_changelink(dev, tb, data); 157 if (err < 0) 158 return err; 159 160 return register_vlan_dev(dev); 161 } 162 163 static inline size_t vlan_qos_map_size(unsigned int n) 164 { 165 if (n == 0) 166 return 0; 167 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 168 return nla_total_size(sizeof(struct nlattr)) + 169 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 170 } 171 172 static size_t vlan_get_size(const struct net_device *dev) 173 { 174 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 175 176 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 177 nla_total_size(2) + /* IFLA_VLAN_ID */ 178 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 179 vlan_qos_map_size(vlan->nr_ingress_mappings) + 180 vlan_qos_map_size(vlan->nr_egress_mappings); 181 } 182 183 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 184 { 185 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 186 struct vlan_priority_tci_mapping *pm; 187 struct ifla_vlan_flags f; 188 struct ifla_vlan_qos_mapping m; 189 struct nlattr *nest; 190 unsigned int i; 191 192 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 193 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 194 goto nla_put_failure; 195 if (vlan->flags) { 196 f.flags = vlan->flags; 197 f.mask = ~0; 198 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 199 goto nla_put_failure; 200 } 201 if (vlan->nr_ingress_mappings) { 202 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 203 if (nest == NULL) 204 goto nla_put_failure; 205 206 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 207 if (!vlan->ingress_priority_map[i]) 208 continue; 209 210 m.from = i; 211 m.to = vlan->ingress_priority_map[i]; 212 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 213 sizeof(m), &m)) 214 goto nla_put_failure; 215 } 216 nla_nest_end(skb, nest); 217 } 218 219 if (vlan->nr_egress_mappings) { 220 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 221 if (nest == NULL) 222 goto nla_put_failure; 223 224 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 225 for (pm = vlan->egress_priority_map[i]; pm; 226 pm = pm->next) { 227 if (!pm->vlan_qos) 228 continue; 229 230 m.from = pm->priority; 231 m.to = (pm->vlan_qos >> 13) & 0x7; 232 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 233 sizeof(m), &m)) 234 goto nla_put_failure; 235 } 236 } 237 nla_nest_end(skb, nest); 238 } 239 return 0; 240 241 nla_put_failure: 242 return -EMSGSIZE; 243 } 244 245 static struct net *vlan_get_link_net(const struct net_device *dev) 246 { 247 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 248 249 return dev_net(real_dev); 250 } 251 252 struct rtnl_link_ops vlan_link_ops __read_mostly = { 253 .kind = "vlan", 254 .maxtype = IFLA_VLAN_MAX, 255 .policy = vlan_policy, 256 .priv_size = sizeof(struct vlan_dev_priv), 257 .setup = vlan_setup, 258 .validate = vlan_validate, 259 .newlink = vlan_newlink, 260 .changelink = vlan_changelink, 261 .dellink = unregister_vlan_dev, 262 .get_size = vlan_get_size, 263 .fill_info = vlan_fill_info, 264 .get_link_net = vlan_get_link_net, 265 }; 266 267 int __init vlan_netlink_init(void) 268 { 269 return rtnl_link_register(&vlan_link_ops); 270 } 271 272 void __exit vlan_netlink_fini(void) 273 { 274 rtnl_link_unregister(&vlan_link_ops); 275 } 276 277 MODULE_ALIAS_RTNL_LINK("vlan"); 278