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_newlink(struct net *src_net, 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(src_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 inline size_t vlan_qos_map_size(unsigned int n) 141 { 142 if (n == 0) 143 return 0; 144 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ 145 return nla_total_size(sizeof(struct nlattr)) + 146 nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; 147 } 148 149 static size_t vlan_get_size(const struct net_device *dev) 150 { 151 struct vlan_dev_info *vlan = vlan_dev_info(dev); 152 153 return nla_total_size(2) + /* IFLA_VLAN_ID */ 154 sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */ 155 vlan_qos_map_size(vlan->nr_ingress_mappings) + 156 vlan_qos_map_size(vlan->nr_egress_mappings); 157 } 158 159 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 160 { 161 struct vlan_dev_info *vlan = vlan_dev_info(dev); 162 struct vlan_priority_tci_mapping *pm; 163 struct ifla_vlan_flags f; 164 struct ifla_vlan_qos_mapping m; 165 struct nlattr *nest; 166 unsigned int i; 167 168 NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id); 169 if (vlan->flags) { 170 f.flags = vlan->flags; 171 f.mask = ~0; 172 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); 173 } 174 if (vlan->nr_ingress_mappings) { 175 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); 176 if (nest == NULL) 177 goto nla_put_failure; 178 179 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { 180 if (!vlan->ingress_priority_map[i]) 181 continue; 182 183 m.from = i; 184 m.to = vlan->ingress_priority_map[i]; 185 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 186 sizeof(m), &m); 187 } 188 nla_nest_end(skb, nest); 189 } 190 191 if (vlan->nr_egress_mappings) { 192 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); 193 if (nest == NULL) 194 goto nla_put_failure; 195 196 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 197 for (pm = vlan->egress_priority_map[i]; pm; 198 pm = pm->next) { 199 if (!pm->vlan_qos) 200 continue; 201 202 m.from = pm->priority; 203 m.to = (pm->vlan_qos >> 13) & 0x7; 204 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, 205 sizeof(m), &m); 206 } 207 } 208 nla_nest_end(skb, nest); 209 } 210 return 0; 211 212 nla_put_failure: 213 return -EMSGSIZE; 214 } 215 216 struct rtnl_link_ops vlan_link_ops __read_mostly = { 217 .kind = "vlan", 218 .maxtype = IFLA_VLAN_MAX, 219 .policy = vlan_policy, 220 .priv_size = sizeof(struct vlan_dev_info), 221 .setup = vlan_setup, 222 .validate = vlan_validate, 223 .newlink = vlan_newlink, 224 .changelink = vlan_changelink, 225 .dellink = unregister_vlan_dev, 226 .get_size = vlan_get_size, 227 .fill_info = vlan_fill_info, 228 }; 229 230 int __init vlan_netlink_init(void) 231 { 232 return rtnl_link_register(&vlan_link_ops); 233 } 234 235 void __exit vlan_netlink_fini(void) 236 { 237 rtnl_link_unregister(&vlan_link_ops); 238 } 239 240 MODULE_ALIAS_RTNL_LINK("vlan"); 241