| /* |
| * 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 <net/rtnetlink.h> |
| #include <net/net_namespace.h> |
| #include <net/sock.h> |
| #include "br_private.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; |
| |
| 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); |
| |
| if (dev->addr_len) |
| NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
| |
| if (dev->ifindex != dev->iflink) |
| NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
| |
| if (event == RTM_NEWLINK) |
| NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
| |
| 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)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 |
| */ |
| static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct net_device *dev; |
| int idx; |
| |
| idx = 0; |
| for_each_netdev(net, dev) { |
| struct net_bridge_port *port = br_port_get(dev); |
| |
| /* not a bridge port */ |
| if (!port || idx < cb->args[0]) |
| goto skip; |
| |
| if (br_fill_ifinfo(skb, port, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, RTM_NEWLINK, |
| NLM_F_MULTI) < 0) |
| break; |
| skip: |
| ++idx; |
| } |
| |
| cb->args[0] = idx; |
| |
| return skb->len; |
| } |
| |
| /* |
| * Change state of port (ie from forwarding to blocking etc) |
| * Used by spanning tree in user space. |
| */ |
| static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct ifinfomsg *ifm; |
| struct nlattr *protinfo; |
| struct net_device *dev; |
| struct net_bridge_port *p; |
| u8 new_state; |
| |
| if (nlmsg_len(nlh) < sizeof(*ifm)) |
| return -EINVAL; |
| |
| ifm = nlmsg_data(nlh); |
| if (ifm->ifi_family != AF_BRIDGE) |
| return -EPFNOSUPPORT; |
| |
| 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; |
| |
| dev = __dev_get_by_index(net, ifm->ifi_index); |
| if (!dev) |
| return -ENODEV; |
| |
| p = br_port_get(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); |
| return 0; |
| } |
| |
| |
| int __init br_netlink_init(void) |
| { |
| if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
| return -ENOBUFS; |
| |
| /* Only the first call to __rtnl_register can fail */ |
| __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); |
| |
| return 0; |
| } |
| |
| void __exit br_netlink_fini(void) |
| { |
| rtnl_unregister_all(PF_BRIDGE); |
| } |
| |