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 } 40 41 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) 42 { 43 struct ifla_vlan_flags *flags; 44 u16 id; 45 int err; 46 47 if (tb[IFLA_ADDRESS]) { 48 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 49 return -EINVAL; 50 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 51 return -EADDRNOTAVAIL; 52 } 53 54 if (!data) 55 return -EINVAL; 56 57 if (data[IFLA_VLAN_PROTOCOL]) { 58 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { 59 case htons(ETH_P_8021Q): 60 case htons(ETH_P_8021AD): 61 break; 62 default: 63 return -EPROTONOSUPPORT; 64 } 65 } 66 67 if (data[IFLA_VLAN_ID]) { 68 id = nla_get_u16(data[IFLA_VLAN_ID]); 69 if (id >= VLAN_VID_MASK) 70 return -ERANGE; 71 } 72 if (data[IFLA_VLAN_FLAGS]) { 73 flags = nla_data(data[IFLA_VLAN_FLAGS]); 74 if ((flags->flags & flags->mask) & 75 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 76 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) 77 return -EINVAL; 78 } 79 80 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 81 if (err < 0) 82 return err; 83 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 84 if (err < 0) 85 return err; 86 return 0; 87 } 88 89 static int vlan_changelink(struct net_device *dev, 90 struct nlattr *tb[], struct nlattr *data[]) 91 { 92 struct ifla_vlan_flags *flags; 93 struct ifla_vlan_qos_mapping *m; 94 struct nlattr *attr; 95 int rem; 96 97 if (data[IFLA_VLAN_FLAGS]) { 98 flags = nla_data(data[IFLA_VLAN_FLAGS]); 99 vlan_dev_change_flags(dev, flags->flags, flags->mask); 100 } 101 if (data[IFLA_VLAN_INGRESS_QOS]) { 102 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 103 m = nla_data(attr); 104 vlan_dev_set_ingress_priority(dev, m->to, m->from); 105 } 106 } 107 if (data[IFLA_VLAN_EGRESS_QOS]) { 108 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 109 m = nla_data(attr); 110 vlan_dev_set_egress_priority(dev, m->from, m->to); 111 } 112 } 113 return 0; 114 } 115 116 static int vlan_newlink(struct net *src_net, struct net_device *dev, 117 struct nlattr *tb[], struct nlattr *data[]) 118 { 119 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 120 struct net_device *real_dev; 121 unsigned int max_mtu; 122 __be16 proto; 123 int err; 124 125 if (!data[IFLA_VLAN_ID]) 126 return -EINVAL; 127 128 if (!tb[IFLA_LINK]) 129 return -EINVAL; 130 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 131 if (!real_dev) 132 return -ENODEV; 133 134 if (data[IFLA_VLAN_PROTOCOL]) 135 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); 136 else 137 proto = htons(ETH_P_8021Q); 138 139 vlan->vlan_proto = proto; 140 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 141 vlan->real_dev = real_dev; 142 vlan->flags = VLAN_FLAG_REORDER_HDR; 143 144 err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id); 145 if (err < 0) 146 return err; 147 148 max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : 149 real_dev->mtu; 150 if (!tb[IFLA_MTU]) 151 dev->mtu = max_mtu; 152 else if (dev->mtu > max_mtu) 153 return -EINVAL; 154 155 err = vlan_changelink(dev, tb, data); 156 if (err < 0) 157 return err; 158 159 return register_vlan_dev(dev); 160 } 161 162 static inline size_t vlan_qos_map_size(unsigned int n) 163 { 164 if (n == 0) 165 return 0; 166 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 167 return nla_total_size(sizeof(struct nlattr)) + 168 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 169 } 170 171 static size_t vlan_get_size(const struct net_device *dev) 172 { 173 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 174 175 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ 176 nla_total_size(2) + /* IFLA_VLAN_ID */ 177 nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ 178 vlan_qos_map_size(vlan->nr_ingress_mappings) + 179 vlan_qos_map_size(vlan->nr_egress_mappings); 180 } 181 182 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 183 { 184 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 185 struct vlan_priority_tci_mapping *pm; 186 struct ifla_vlan_flags f; 187 struct ifla_vlan_qos_mapping m; 188 struct nlattr *nest; 189 unsigned int i; 190 191 if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || 192 nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) 193 goto nla_put_failure; 194 if (vlan->flags) { 195 f.flags = vlan->flags; 196 f.mask = ~0; 197 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) 198 goto nla_put_failure; 199 } 200 if (vlan->nr_ingress_mappings) { 201 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 202 if (nest == NULL) 203 goto nla_put_failure; 204 205 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 206 if (!vlan->ingress_priority_map[i]) 207 continue; 208 209 m.from = i; 210 m.to = vlan->ingress_priority_map[i]; 211 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 212 sizeof(m), &m)) 213 goto nla_put_failure; 214 } 215 nla_nest_end(skb, nest); 216 } 217 218 if (vlan->nr_egress_mappings) { 219 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 220 if (nest == NULL) 221 goto nla_put_failure; 222 223 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 224 for (pm = vlan->egress_priority_map[i]; pm; 225 pm = pm->next) { 226 if (!pm->vlan_qos) 227 continue; 228 229 m.from = pm->priority; 230 m.to = (pm->vlan_qos >> 13) & 0x7; 231 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, 232 sizeof(m), &m)) 233 goto nla_put_failure; 234 } 235 } 236 nla_nest_end(skb, nest); 237 } 238 return 0; 239 240 nla_put_failure: 241 return -EMSGSIZE; 242 } 243 244 static struct net *vlan_get_link_net(const struct net_device *dev) 245 { 246 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 247 248 return dev_net(real_dev); 249 } 250 251 struct rtnl_link_ops vlan_link_ops __read_mostly = { 252 .kind = "vlan", 253 .maxtype = IFLA_VLAN_MAX, 254 .policy = vlan_policy, 255 .priv_size = sizeof(struct vlan_dev_priv), 256 .setup = vlan_setup, 257 .validate = vlan_validate, 258 .newlink = vlan_newlink, 259 .changelink = vlan_changelink, 260 .dellink = unregister_vlan_dev, 261 .get_size = vlan_get_size, 262 .fill_info = vlan_fill_info, 263 .get_link_net = vlan_get_link_net, 264 }; 265 266 int __init vlan_netlink_init(void) 267 { 268 return rtnl_link_register(&vlan_link_ops); 269 } 270 271 void __exit vlan_netlink_fini(void) 272 { 273 rtnl_link_unregister(&vlan_link_ops); 274 } 275 276 MODULE_ALIAS_RTNL_LINK("vlan"); 277