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