| /* |
| * Bridge netlink control interface |
| * |
| * Authors: |
| * Stephen Hemminger <shemminger@osdl.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/etherdevice.h> |
| #include <net/rtnetlink.h> |
| #include <net/net_namespace.h> |
| #include <net/sock.h> |
| |
| #include "br_private.h" |
| #include "br_private_stp.h" |
| |
| static inline size_t br_nlmsg_size(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
| + nla_total_size(4) /* IFLA_MASTER */ |
| + nla_total_size(4) /* IFLA_MTU */ |
| + nla_total_size(4) /* IFLA_LINK */ |
| + nla_total_size(1) /* IFLA_OPERSTATE */ |
| + nla_total_size(1); /* IFLA_PROTINFO */ |
| } |
| |
| /* |
| * Create one netlink message for one interface |
| * Contains port and master info as well as carrier and bridge state. |
| */ |
| static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, |
| u32 pid, u32 seq, int event, unsigned int flags) |
| { |
| const struct net_bridge *br = port->br; |
| const struct net_device *dev = port->dev; |
| struct ifinfomsg *hdr; |
| struct nlmsghdr *nlh; |
| u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
| |
| br_debug(br, "br_fill_info event %d port %s master %s\n", |
| event, dev->name, br->dev->name); |
| |
| nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| hdr = nlmsg_data(nlh); |
| hdr->ifi_family = AF_BRIDGE; |
| hdr->__ifi_pad = 0; |
| hdr->ifi_type = dev->type; |
| hdr->ifi_index = dev->ifindex; |
| hdr->ifi_flags = dev_get_flags(dev); |
| hdr->ifi_change = 0; |
| |
| if (nla_put_string(skb, IFLA_IFNAME, dev->name) || |
| nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || |
| nla_put_u32(skb, IFLA_MTU, dev->mtu) || |
| nla_put_u8(skb, IFLA_OPERSTATE, operstate) || |
| (dev->addr_len && |
| nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || |
| (dev->ifindex != dev->iflink && |
| nla_put_u32(skb, IFLA_LINK, dev->iflink)) || |
| (event == RTM_NEWLINK && |
| nla_put_u8(skb, IFLA_PROTINFO, port->state))) |
| goto nla_put_failure; |
| return nlmsg_end(skb, nlh); |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| /* |
| * Notify listeners of a change in port information |
| */ |
| void br_ifinfo_notify(int event, struct net_bridge_port *port) |
| { |
| struct net *net = dev_net(port->dev); |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| br_debug(port->br, "port %u(%s) event %d\n", |
| (unsigned int)port->port_no, port->dev->name, event); |
| |
| skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
| if (skb == NULL) |
| goto errout; |
| |
| err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in br_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
| } |
| |
| /* |
| * Dump information about all ports, in response to GETLINK |
| */ |
| int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, |
| struct net_device *dev) |
| { |
| int err = 0; |
| struct net_bridge_port *port = br_port_get_rcu(dev); |
| |
| /* not a bridge port */ |
| if (!port) |
| goto out; |
| |
| err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI); |
| out: |
| return err; |
| } |
| |
| /* |
| * Change state of port (ie from forwarding to blocking etc) |
| * Used by spanning tree in user space. |
| */ |
| int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) |
| { |
| struct ifinfomsg *ifm; |
| struct nlattr *protinfo; |
| struct net_bridge_port *p; |
| u8 new_state; |
| |
| ifm = nlmsg_data(nlh); |
| |
| protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
| if (!protinfo || nla_len(protinfo) < sizeof(u8)) |
| return -EINVAL; |
| |
| new_state = nla_get_u8(protinfo); |
| if (new_state > BR_STATE_BLOCKING) |
| return -EINVAL; |
| |
| p = br_port_get_rtnl(dev); |
| if (!p) |
| return -EINVAL; |
| |
| /* if kernel STP is running, don't allow changes */ |
| if (p->br->stp_enabled == BR_KERNEL_STP) |
| return -EBUSY; |
| |
| if (!netif_running(dev) || |
| (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) |
| return -ENETDOWN; |
| |
| p->state = new_state; |
| br_log_state(p); |
| |
| spin_lock_bh(&p->br->lock); |
| br_port_state_selection(p->br); |
| spin_unlock_bh(&p->br->lock); |
| |
| br_ifinfo_notify(RTM_NEWLINK, p); |
| |
| return 0; |
| } |
| |
| static int br_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| 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; |
| } |
| |
| return 0; |
| } |
| |
| struct rtnl_link_ops br_link_ops __read_mostly = { |
| .kind = "bridge", |
| .priv_size = sizeof(struct net_bridge), |
| .setup = br_dev_setup, |
| .validate = br_validate, |
| .dellink = br_dev_delete, |
| }; |
| |
| int __init br_netlink_init(void) |
| { |
| return rtnl_link_register(&br_link_ops); |
| } |
| |
| void __exit br_netlink_fini(void) |
| { |
| rtnl_link_unregister(&br_link_ops); |
| rtnl_unregister_all(PF_BRIDGE); |
| } |