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