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) & ~VLAN_FLAG_REORDER_HDR) 63 return -EINVAL; 64 } 65 66 err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); 67 if (err < 0) 68 return err; 69 err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); 70 if (err < 0) 71 return err; 72 return 0; 73 } 74 75 static int vlan_changelink(struct net_device *dev, 76 struct nlattr *tb[], struct nlattr *data[]) 77 { 78 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); 79 struct ifla_vlan_flags *flags; 80 struct ifla_vlan_qos_mapping *m; 81 struct nlattr *attr; 82 int rem; 83 84 if (data[IFLA_VLAN_FLAGS]) { 85 flags = nla_data(data[IFLA_VLAN_FLAGS]); 86 vlan->flags = (vlan->flags & ~flags->mask) | 87 (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_newlink(struct net_device *dev, 105 struct nlattr *tb[], struct nlattr *data[]) 106 { 107 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); 108 struct net_device *real_dev; 109 int err; 110 111 if (!data[IFLA_VLAN_ID]) 112 return -EINVAL; 113 114 if (!tb[IFLA_LINK]) 115 return -EINVAL; 116 real_dev = __dev_get_by_index(&init_net, nla_get_u32(tb[IFLA_LINK])); 117 if (!real_dev) 118 return -ENODEV; 119 120 vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); 121 vlan->real_dev = real_dev; 122 vlan->flags = VLAN_FLAG_REORDER_HDR; 123 124 err = vlan_check_real_dev(real_dev, vlan->vlan_id); 125 if (err < 0) 126 return err; 127 128 if (!tb[IFLA_MTU]) 129 dev->mtu = real_dev->mtu; 130 else if (dev->mtu > real_dev->mtu) 131 return -EINVAL; 132 133 err = vlan_changelink(dev, tb, data); 134 if (err < 0) 135 return err; 136 137 return register_vlan_dev(dev); 138 } 139 140 static void vlan_dellink(struct net_device *dev) 141 { 142 unregister_vlan_device(dev); 143 } 144 145 static inline size_t vlan_qos_map_size(unsigned int n) 146 { 147 if (n == 0) 148 return 0; 149 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 150 return nla_total_size(sizeof(struct nlattr)) + 151 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 152 } 153 154 static size_t vlan_get_size(const struct net_device *dev) 155 { 156 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); 157 158 return nla_total_size(2) + /* IFLA_VLAN_ID */ 159 vlan_qos_map_size(vlan->nr_ingress_mappings) + 160 vlan_qos_map_size(vlan->nr_egress_mappings); 161 } 162 163 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 164 { 165 struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev); 166 struct vlan_priority_tci_mapping *pm; 167 struct ifla_vlan_flags f; 168 struct ifla_vlan_qos_mapping m; 169 struct nlattr *nest; 170 unsigned int i; 171 172 NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id); 173 if (vlan->flags) { 174 f.flags = vlan->flags; 175 f.mask = ~0; 176 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); 177 } 178 if (vlan->nr_ingress_mappings) { 179 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 180 if (nest == NULL) 181 goto nla_put_failure; 182 183 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 184 if (!vlan->ingress_priority_map[i]) 185 continue; 186 187 m.from = i; 188 m.to = vlan->ingress_priority_map[i]; 189 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 190 sizeof(m), &m); 191 } 192 nla_nest_end(skb, nest); 193 } 194 195 if (vlan->nr_egress_mappings) { 196 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 197 if (nest == NULL) 198 goto nla_put_failure; 199 200 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 201 for (pm = vlan->egress_priority_map[i]; pm; 202 pm = pm->next) { 203 if (!pm->vlan_qos) 204 continue; 205 206 m.from = pm->priority; 207 m.to = (pm->vlan_qos >> 13) & 0x7; 208 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 209 sizeof(m), &m); 210 } 211 } 212 nla_nest_end(skb, nest); 213 } 214 return 0; 215 216 nla_put_failure: 217 return -EMSGSIZE; 218 } 219 220 struct rtnl_link_ops vlan_link_ops __read_mostly = { 221 .kind = "vlan", 222 .maxtype = IFLA_VLAN_MAX, 223 .policy = vlan_policy, 224 .priv_size = sizeof(struct vlan_dev_info), 225 .setup = vlan_setup, 226 .validate = vlan_validate, 227 .newlink = vlan_newlink, 228 .changelink = vlan_changelink, 229 .dellink = vlan_dellink, 230 .get_size = vlan_get_size, 231 .fill_info = vlan_fill_info, 232 }; 233 234 int __init vlan_netlink_init(void) 235 { 236 return rtnl_link_register(&vlan_link_ops); 237 } 238 239 void __exit vlan_netlink_fini(void) 240 { 241 rtnl_link_unregister(&vlan_link_ops); 242 } 243 244 MODULE_ALIAS_RTNL_LINK("vlan"); 245