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 <net/net_namespace.h> 15 #include <net/netlink.h> 16 #include <net/rtnetlink.h> 17 #include "vlan.h" 18 19 20 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { 21 [IFLA_VLAN_ID] = { .type = NLA_U16 }, 22 [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, 23 [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, 24 [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, 25 }; 26 27 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { 28 [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, 29 }; 30 31 32 static inline int vlan_validate_qos_map(struct nlattr *attr) 33 { 34 if (!attr) 35 return 0; 36 return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy); 37 } 38 39 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) 40 { 41 struct ifla_vlan_flags *flags; 42 u16 id; 43 int err; 44 45 if (tb[IFLA_ADDRESS]) { 46 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 47 return -EINVAL; 48 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 49 return -EADDRNOTAVAIL; 50 } 51 52 if (!data) 53 return -EINVAL; 54 55 if (data[IFLA_VLAN_ID]) { 56 id = nla_get_u16(data[IFLA_VLAN_ID]); 57 if (id >= VLAN_VID_MASK) 58 return -ERANGE; 59 } 60 if (data[IFLA_VLAN_FLAGS]) { 61 flags = nla_data(data[IFLA_VLAN_FLAGS]); 62 if ((flags->flags & flags->mask) & 63 ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 64 VLAN_FLAG_LOOSE_BINDING)) 65 return -EINVAL; 66 } 67 68 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 69 if (err < 0) 70 return err; 71 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 72 if (err < 0) 73 return err; 74 return 0; 75 } 76 77 static int vlan_changelink(struct net_device *dev, 78 struct nlattr *tb[], struct nlattr *data[]) 79 { 80 struct ifla_vlan_flags *flags; 81 struct ifla_vlan_qos_mapping *m; 82 struct nlattr *attr; 83 int rem; 84 85 if (data[IFLA_VLAN_FLAGS]) { 86 flags = nla_data(data[IFLA_VLAN_FLAGS]); 87 vlan_dev_change_flags(dev, flags->flags, flags->mask); 88 } 89 if (data[IFLA_VLAN_INGRESS_QOS]) { 90 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { 91 m = nla_data(attr); 92 vlan_dev_set_ingress_priority(dev, m->to, m->from); 93 } 94 } 95 if (data[IFLA_VLAN_EGRESS_QOS]) { 96 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { 97 m = nla_data(attr); 98 vlan_dev_set_egress_priority(dev, m->from, m->to); 99 } 100 } 101 return 0; 102 } 103 104 static int vlan_get_tx_queues(struct net *net, 105 struct nlattr *tb[], 106 unsigned int *num_tx_queues, 107 unsigned int *real_num_tx_queues) 108 { 109 struct net_device *real_dev; 110 111 if (!tb[IFLA_LINK]) 112 return -EINVAL; 113 114 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 115 if (!real_dev) 116 return -ENODEV; 117 118 *num_tx_queues = real_dev->num_tx_queues; 119 *real_num_tx_queues = real_dev->real_num_tx_queues; 120 return 0; 121 } 122 123 static int vlan_newlink(struct net *src_net, struct net_device *dev, 124 struct nlattr *tb[], struct nlattr *data[]) 125 { 126 struct vlan_dev_info *vlan = vlan_dev_info(dev); 127 struct net_device *real_dev; 128 int err; 129 130 if (!data[IFLA_VLAN_ID]) 131 return -EINVAL; 132 133 if (!tb[IFLA_LINK]) 134 return -EINVAL; 135 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 136 if (!real_dev) 137 return -ENODEV; 138 139 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 140 vlan->real_dev = real_dev; 141 vlan->flags = VLAN_FLAG_REORDER_HDR; 142 143 err = vlan_check_real_dev(real_dev, vlan->vlan_id); 144 if (err < 0) 145 return err; 146 147 if (!tb[IFLA_MTU]) 148 dev->mtu = real_dev->mtu; 149 else if (dev->mtu > real_dev->mtu) 150 return -EINVAL; 151 152 err = vlan_changelink(dev, tb, data); 153 if (err < 0) 154 return err; 155 156 return register_vlan_dev(dev); 157 } 158 159 static inline size_t vlan_qos_map_size(unsigned int n) 160 { 161 if (n == 0) 162 return 0; 163 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 164 return nla_total_size(sizeof(struct nlattr)) + 165 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 166 } 167 168 static size_t vlan_get_size(const struct net_device *dev) 169 { 170 struct vlan_dev_info *vlan = vlan_dev_info(dev); 171 172 return nla_total_size(2) + /* IFLA_VLAN_ID */ 173 sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */ 174 vlan_qos_map_size(vlan->nr_ingress_mappings) + 175 vlan_qos_map_size(vlan->nr_egress_mappings); 176 } 177 178 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 179 { 180 struct vlan_dev_info *vlan = vlan_dev_info(dev); 181 struct vlan_priority_tci_mapping *pm; 182 struct ifla_vlan_flags f; 183 struct ifla_vlan_qos_mapping m; 184 struct nlattr *nest; 185 unsigned int i; 186 187 NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id); 188 if (vlan->flags) { 189 f.flags = vlan->flags; 190 f.mask = ~0; 191 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); 192 } 193 if (vlan->nr_ingress_mappings) { 194 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 195 if (nest == NULL) 196 goto nla_put_failure; 197 198 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 199 if (!vlan->ingress_priority_map[i]) 200 continue; 201 202 m.from = i; 203 m.to = vlan->ingress_priority_map[i]; 204 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 205 sizeof(m), &m); 206 } 207 nla_nest_end(skb, nest); 208 } 209 210 if (vlan->nr_egress_mappings) { 211 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 212 if (nest == NULL) 213 goto nla_put_failure; 214 215 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 216 for (pm = vlan->egress_priority_map[i]; pm; 217 pm = pm->next) { 218 if (!pm->vlan_qos) 219 continue; 220 221 m.from = pm->priority; 222 m.to = (pm->vlan_qos >> 13) & 0x7; 223 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 224 sizeof(m), &m); 225 } 226 } 227 nla_nest_end(skb, nest); 228 } 229 return 0; 230 231 nla_put_failure: 232 return -EMSGSIZE; 233 } 234 235 struct rtnl_link_ops vlan_link_ops __read_mostly = { 236 .kind = "vlan", 237 .maxtype = IFLA_VLAN_MAX, 238 .policy = vlan_policy, 239 .priv_size = sizeof(struct vlan_dev_info), 240 .get_tx_queues = vlan_get_tx_queues, 241 .setup = vlan_setup, 242 .validate = vlan_validate, 243 .newlink = vlan_newlink, 244 .changelink = vlan_changelink, 245 .dellink = unregister_vlan_dev, 246 .get_size = vlan_get_size, 247 .fill_info = vlan_fill_info, 248 }; 249 250 int __init vlan_netlink_init(void) 251 { 252 return rtnl_link_register(&vlan_link_ops); 253 } 254 255 void __exit vlan_netlink_fini(void) 256 { 257 rtnl_link_unregister(&vlan_link_ops); 258 } 259 260 MODULE_ALIAS_RTNL_LINK("vlan"); 261