/* * VLAN netlink control interface * * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/if_vlan.h> #include <net/net_namespace.h> #include <net/netlink.h> #include <net/rtnetlink.h> #include "vlan.h" static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { [IFLA_VLAN_ID] = { .type = NLA_U16 }, [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, }; static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, }; static inline int vlan_validate_qos_map(struct nlattr *attr) { if (!attr) return 0; return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy); } static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) { struct ifla_vlan_flags *flags; u16 id; int err; if (tb[IFLA_ADDRESS]) { if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) return -EINVAL; if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) return -EADDRNOTAVAIL; } if (!data) return -EINVAL; if (data[IFLA_VLAN_ID]) { id = nla_get_u16(data[IFLA_VLAN_ID]); if (id >= VLAN_VID_MASK) return -ERANGE; } if (data[IFLA_VLAN_FLAGS]) { flags = nla_data(data[IFLA_VLAN_FLAGS]); if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR) return -EINVAL; } err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); if (err < 0) return err; err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); if (err < 0) return err; return 0; } static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct vlan_dev_info *vlan = vlan_dev_info(dev); struct ifla_vlan_flags *flags; struct ifla_vlan_qos_mapping *m; struct nlattr *attr; int rem; if (data[IFLA_VLAN_FLAGS]) { flags = nla_data(data[IFLA_VLAN_FLAGS]); vlan->flags = (vlan->flags & ~flags->mask) | (flags->flags & flags->mask); } if (data[IFLA_VLAN_INGRESS_QOS]) { nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { m = nla_data(attr); vlan_dev_set_ingress_priority(dev, m->to, m->from); } } if (data[IFLA_VLAN_EGRESS_QOS]) { nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { m = nla_data(attr); vlan_dev_set_egress_priority(dev, m->from, m->to); } } return 0; } static int vlan_newlink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct vlan_dev_info *vlan = vlan_dev_info(dev); struct net_device *real_dev; int err; if (!data[IFLA_VLAN_ID]) return -EINVAL; if (!tb[IFLA_LINK]) return -EINVAL; real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK])); if (!real_dev) return -ENODEV; vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); vlan->real_dev = real_dev; vlan->flags = VLAN_FLAG_REORDER_HDR; err = vlan_check_real_dev(real_dev, vlan->vlan_id); if (err < 0) return err; if (!tb[IFLA_MTU]) dev->mtu = real_dev->mtu; else if (dev->mtu > real_dev->mtu) return -EINVAL; err = vlan_changelink(dev, tb, data); if (err < 0) return err; return register_vlan_dev(dev); } static inline size_t vlan_qos_map_size(unsigned int n) { if (n == 0) return 0; /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ return nla_total_size(sizeof(struct nlattr)) + nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; } static size_t vlan_get_size(const struct net_device *dev) { struct vlan_dev_info *vlan = vlan_dev_info(dev); return nla_total_size(2) + /* IFLA_VLAN_ID */ vlan_qos_map_size(vlan->nr_ingress_mappings) + vlan_qos_map_size(vlan->nr_egress_mappings); } static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) { struct vlan_dev_info *vlan = vlan_dev_info(dev); struct vlan_priority_tci_mapping *pm; struct ifla_vlan_flags f; struct ifla_vlan_qos_mapping m; struct nlattr *nest; unsigned int i; NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id); if (vlan->flags) { f.flags = vlan->flags; f.mask = ~0; NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f); } if (vlan->nr_ingress_mappings) { nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); if (nest == NULL) goto nla_put_failure; for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { if (!vlan->ingress_priority_map[i]) continue; m.from = i; m.to = vlan->ingress_priority_map[i]; NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, sizeof(m), &m); } nla_nest_end(skb, nest); } if (vlan->nr_egress_mappings) { nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); if (nest == NULL) goto nla_put_failure; for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { for (pm = vlan->egress_priority_map[i]; pm; pm = pm->next) { if (!pm->vlan_qos) continue; m.from = pm->priority; m.to = (pm->vlan_qos >> 13) & 0x7; NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING, sizeof(m), &m); } } nla_nest_end(skb, nest); } return 0; nla_put_failure: return -EMSGSIZE; } struct rtnl_link_ops vlan_link_ops __read_mostly = { .kind = "vlan", .maxtype = IFLA_VLAN_MAX, .policy = vlan_policy, .priv_size = sizeof(struct vlan_dev_info), .setup = vlan_setup, .validate = vlan_validate, .newlink = vlan_newlink, .changelink = vlan_changelink, .dellink = unregister_vlan_dev, .get_size = vlan_get_size, .fill_info = vlan_fill_info, }; int __init vlan_netlink_init(void) { return rtnl_link_register(&vlan_link_ops); } void __exit vlan_netlink_fini(void) { rtnl_link_unregister(&vlan_link_ops); } MODULE_ALIAS_RTNL_LINK("vlan");