diff options
Diffstat (limited to 'net/8021q/vlan_netlink.c')
| -rw-r--r-- | net/8021q/vlan_netlink.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c new file mode 100644 index 000000000..a3b68243f --- /dev/null +++ b/net/8021q/vlan_netlink.c @@ -0,0 +1,316 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * VLAN netlink control interface + * + * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> + */ + +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/if_vlan.h> +#include <linux/module.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 }, + [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, +}; + +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_deprecated(attr, IFLA_VLAN_QOS_MAX, + vlan_map_policy, NULL); +} + +static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct ifla_vlan_flags *flags; + u16 id; + int err; + + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { + NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); + return -EINVAL; + } + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); + return -EADDRNOTAVAIL; + } + } + + if (!data) { + NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); + return -EINVAL; + } + + if (data[IFLA_VLAN_PROTOCOL]) { + switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { + case htons(ETH_P_8021Q): + case htons(ETH_P_8021AD): + break; + default: + NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); + return -EPROTONOSUPPORT; + } + } + + if (data[IFLA_VLAN_ID]) { + id = nla_get_u16(data[IFLA_VLAN_ID]); + if (id >= VLAN_VID_MASK) { + NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); + return -ERANGE; + } + } + if (data[IFLA_VLAN_FLAGS]) { + flags = nla_data(data[IFLA_VLAN_FLAGS]); + if ((flags->flags & flags->mask) & + ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | + VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | + VLAN_FLAG_BRIDGE_BINDING)) { + NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); + return -EINVAL; + } + } + + err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); + if (err < 0) { + NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); + return err; + } + err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); + if (err < 0) { + NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); + return err; + } + return 0; +} + +static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], + struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct ifla_vlan_flags *flags; + struct ifla_vlan_qos_mapping *m; + struct nlattr *attr; + int rem, err; + + if (data[IFLA_VLAN_FLAGS]) { + flags = nla_data(data[IFLA_VLAN_FLAGS]); + err = vlan_dev_change_flags(dev, flags->flags, flags->mask); + if (err) + return err; + } + if (data[IFLA_VLAN_INGRESS_QOS]) { + nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { + if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) + continue; + 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) { + if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING) + continue; + m = nla_data(attr); + err = vlan_dev_set_egress_priority(dev, m->from, m->to); + if (err) + return err; + } + } + return 0; +} + +static int vlan_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct vlan_dev_priv *vlan = vlan_dev_priv(dev); + struct net_device *real_dev; + unsigned int max_mtu; + __be16 proto; + int err; + + if (!data[IFLA_VLAN_ID]) { + NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); + return -EINVAL; + } + + if (!tb[IFLA_LINK]) { + NL_SET_ERR_MSG_MOD(extack, "link not specified"); + return -EINVAL; + } + + real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + if (!real_dev) { + NL_SET_ERR_MSG_MOD(extack, "link does not exist"); + return -ENODEV; + } + + if (data[IFLA_VLAN_PROTOCOL]) + proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); + else + proto = htons(ETH_P_8021Q); + + vlan->vlan_proto = proto; + vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); + vlan->real_dev = real_dev; + dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); + vlan->flags = VLAN_FLAG_REORDER_HDR; + + err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, + extack); + if (err < 0) + return err; + + max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : + real_dev->mtu; + if (!tb[IFLA_MTU]) + dev->mtu = max_mtu; + else if (dev->mtu > max_mtu) + return -EINVAL; + + /* Note: If this initial vlan_changelink() fails, we need + * to call vlan_dev_free_egress_priority() to free memory. + */ + err = vlan_changelink(dev, tb, data, extack); + + if (!err) + err = register_vlan_dev(dev, extack); + + if (err) + vlan_dev_free_egress_priority(dev); + return err; +} + +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_priv *vlan = vlan_dev_priv(dev); + + return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ + nla_total_size(2) + /* IFLA_VLAN_ID */ + nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ + 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_priv *vlan = vlan_dev_priv(dev); + struct vlan_priority_tci_mapping *pm; + struct ifla_vlan_flags f; + struct ifla_vlan_qos_mapping m; + struct nlattr *nest; + unsigned int i; + + if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || + nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) + goto nla_put_failure; + if (vlan->flags) { + f.flags = vlan->flags; + f.mask = ~0; + if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) + goto nla_put_failure; + } + if (vlan->nr_ingress_mappings) { + nest = nla_nest_start_noflag(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]; + if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, + sizeof(m), &m)) + goto nla_put_failure; + } + nla_nest_end(skb, nest); + } + + if (vlan->nr_egress_mappings) { + nest = nla_nest_start_noflag(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; + if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, + sizeof(m), &m)) + goto nla_put_failure; + } + } + nla_nest_end(skb, nest); + } + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static struct net *vlan_get_link_net(const struct net_device *dev) +{ + struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; + + return dev_net(real_dev); +} + +struct rtnl_link_ops vlan_link_ops __read_mostly = { + .kind = "vlan", + .maxtype = IFLA_VLAN_MAX, + .policy = vlan_policy, + .priv_size = sizeof(struct vlan_dev_priv), + .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, + .get_link_net = vlan_get_link_net, +}; + +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"); |