mirror of https://gitee.com/openkylin/linux.git
611 lines
15 KiB
C
611 lines
15 KiB
C
/*
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* Bridge netlink control interface
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*
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* Authors:
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* Stephen Hemminger <shemminger@osdl.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/etherdevice.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <uapi/linux/if_bridge.h>
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#include "br_private.h"
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#include "br_private_stp.h"
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static inline size_t br_port_info_size(void)
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{
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return nla_total_size(1) /* IFLA_BRPORT_STATE */
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+ nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
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+ nla_total_size(4) /* IFLA_BRPORT_COST */
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+ nla_total_size(1) /* IFLA_BRPORT_MODE */
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+ nla_total_size(1) /* IFLA_BRPORT_GUARD */
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+ nla_total_size(1) /* IFLA_BRPORT_PROTECT */
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+ nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
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+ nla_total_size(1) /* IFLA_BRPORT_LEARNING */
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+ nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
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+ 0;
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}
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static inline size_t br_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct ifinfomsg))
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+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
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+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
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+ nla_total_size(4) /* IFLA_MASTER */
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+ nla_total_size(4) /* IFLA_MTU */
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+ nla_total_size(4) /* IFLA_LINK */
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+ nla_total_size(1) /* IFLA_OPERSTATE */
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+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
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}
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static int br_port_fill_attrs(struct sk_buff *skb,
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const struct net_bridge_port *p)
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{
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u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
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if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
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nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
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nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
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nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
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nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
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nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
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nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
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nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
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nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
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return -EMSGSIZE;
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return 0;
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}
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/*
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* Create one netlink message for one interface
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* Contains port and master info as well as carrier and bridge state.
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*/
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static int br_fill_ifinfo(struct sk_buff *skb,
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const struct net_bridge_port *port,
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u32 pid, u32 seq, int event, unsigned int flags,
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u32 filter_mask, const struct net_device *dev)
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{
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const struct net_bridge *br;
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struct ifinfomsg *hdr;
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struct nlmsghdr *nlh;
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u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
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if (port)
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br = port->br;
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else
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br = netdev_priv(dev);
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br_debug(br, "br_fill_info event %d port %s master %s\n",
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event, dev->name, br->dev->name);
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nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
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if (nlh == NULL)
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return -EMSGSIZE;
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hdr = nlmsg_data(nlh);
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hdr->ifi_family = AF_BRIDGE;
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hdr->__ifi_pad = 0;
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hdr->ifi_type = dev->type;
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hdr->ifi_index = dev->ifindex;
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hdr->ifi_flags = dev_get_flags(dev);
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hdr->ifi_change = 0;
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if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
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nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
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nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
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nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
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(dev->addr_len &&
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nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
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(dev->ifindex != dev->iflink &&
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nla_put_u32(skb, IFLA_LINK, dev->iflink)))
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goto nla_put_failure;
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if (event == RTM_NEWLINK && port) {
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struct nlattr *nest
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= nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
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if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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}
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/* Check if the VID information is requested */
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if (filter_mask & RTEXT_FILTER_BRVLAN) {
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struct nlattr *af;
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const struct net_port_vlans *pv;
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struct bridge_vlan_info vinfo;
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u16 vid;
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u16 pvid;
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if (port)
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pv = nbp_get_vlan_info(port);
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else
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pv = br_get_vlan_info(br);
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if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
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goto done;
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af = nla_nest_start(skb, IFLA_AF_SPEC);
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if (!af)
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goto nla_put_failure;
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pvid = br_get_pvid(pv);
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for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
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vinfo.vid = vid;
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vinfo.flags = 0;
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if (vid == pvid)
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vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
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if (test_bit(vid, pv->untagged_bitmap))
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vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
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if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
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sizeof(vinfo), &vinfo))
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goto nla_put_failure;
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}
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nla_nest_end(skb, af);
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}
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done:
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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/*
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* Notify listeners of a change in port information
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*/
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void br_ifinfo_notify(int event, struct net_bridge_port *port)
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{
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struct net *net;
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struct sk_buff *skb;
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int err = -ENOBUFS;
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if (!port)
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return;
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net = dev_net(port->dev);
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br_debug(port->br, "port %u(%s) event %d\n",
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(unsigned int)port->port_no, port->dev->name, event);
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skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
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if (skb == NULL)
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goto errout;
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err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
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if (err < 0) {
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/* -EMSGSIZE implies BUG in br_nlmsg_size() */
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
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return;
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errout:
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rtnl_set_sk_err(net, RTNLGRP_LINK, err);
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}
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/*
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* Dump information about all ports, in response to GETLINK
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*/
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int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
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struct net_device *dev, u32 filter_mask)
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{
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int err = 0;
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struct net_bridge_port *port = br_port_get_rtnl(dev);
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if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
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goto out;
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err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
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filter_mask, dev);
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out:
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return err;
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}
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static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
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[IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
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[IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
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[IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
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.len = sizeof(struct bridge_vlan_info), },
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};
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static int br_afspec(struct net_bridge *br,
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struct net_bridge_port *p,
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struct nlattr *af_spec,
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int cmd)
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{
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struct nlattr *tb[IFLA_BRIDGE_MAX+1];
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int err = 0;
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err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
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if (err)
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return err;
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if (tb[IFLA_BRIDGE_VLAN_INFO]) {
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struct bridge_vlan_info *vinfo;
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vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
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if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
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return -EINVAL;
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switch (cmd) {
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case RTM_SETLINK:
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if (p) {
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err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
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if (err)
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break;
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if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
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err = br_vlan_add(p->br, vinfo->vid,
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vinfo->flags);
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} else
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err = br_vlan_add(br, vinfo->vid, vinfo->flags);
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break;
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case RTM_DELLINK:
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if (p) {
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nbp_vlan_delete(p, vinfo->vid);
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if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
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br_vlan_delete(p->br, vinfo->vid);
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} else
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br_vlan_delete(br, vinfo->vid);
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break;
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}
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}
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return err;
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}
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static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
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[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
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[IFLA_BRPORT_COST] = { .type = NLA_U32 },
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[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
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[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
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[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
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[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
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[IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
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[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
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};
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/* Change the state of the port and notify spanning tree */
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static int br_set_port_state(struct net_bridge_port *p, u8 state)
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{
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if (state > BR_STATE_BLOCKING)
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return -EINVAL;
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/* if kernel STP is running, don't allow changes */
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if (p->br->stp_enabled == BR_KERNEL_STP)
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return -EBUSY;
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/* if device is not up, change is not allowed
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* if link is not present, only allowable state is disabled
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*/
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if (!netif_running(p->dev) ||
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(!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
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return -ENETDOWN;
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br_set_state(p, state);
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br_log_state(p);
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br_port_state_selection(p->br);
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return 0;
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}
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/* Set/clear or port flags based on attribute */
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static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
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int attrtype, unsigned long mask)
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{
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if (tb[attrtype]) {
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u8 flag = nla_get_u8(tb[attrtype]);
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if (flag)
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p->flags |= mask;
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else
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p->flags &= ~mask;
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}
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}
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/* Process bridge protocol info on port */
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static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
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{
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int err;
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unsigned long old_flags = p->flags;
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br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
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br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
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br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
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br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
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br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
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br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
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if (tb[IFLA_BRPORT_COST]) {
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err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
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if (err)
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return err;
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}
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if (tb[IFLA_BRPORT_PRIORITY]) {
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err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
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if (err)
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return err;
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}
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if (tb[IFLA_BRPORT_STATE]) {
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err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
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if (err)
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return err;
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}
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br_port_flags_change(p, old_flags ^ p->flags);
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return 0;
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}
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/* Change state and parameters on port. */
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int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
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{
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struct nlattr *protinfo;
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struct nlattr *afspec;
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struct net_bridge_port *p;
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struct nlattr *tb[IFLA_BRPORT_MAX + 1];
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int err = 0;
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protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
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afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
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if (!protinfo && !afspec)
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return 0;
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p = br_port_get_rtnl(dev);
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/* We want to accept dev as bridge itself if the AF_SPEC
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* is set to see if someone is setting vlan info on the bridge
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*/
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if (!p && !afspec)
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return -EINVAL;
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if (p && protinfo) {
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if (protinfo->nla_type & NLA_F_NESTED) {
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err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
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protinfo, br_port_policy);
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if (err)
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return err;
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spin_lock_bh(&p->br->lock);
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err = br_setport(p, tb);
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spin_unlock_bh(&p->br->lock);
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} else {
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/* Binary compatibility with old RSTP */
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if (nla_len(protinfo) < sizeof(u8))
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return -EINVAL;
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spin_lock_bh(&p->br->lock);
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err = br_set_port_state(p, nla_get_u8(protinfo));
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spin_unlock_bh(&p->br->lock);
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}
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if (err)
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goto out;
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}
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if (afspec) {
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err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
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afspec, RTM_SETLINK);
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}
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if (err == 0)
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br_ifinfo_notify(RTM_NEWLINK, p);
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out:
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return err;
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}
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/* Delete port information */
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int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
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{
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struct nlattr *afspec;
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struct net_bridge_port *p;
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int err;
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afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
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if (!afspec)
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return 0;
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p = br_port_get_rtnl(dev);
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/* We want to accept dev as bridge itself as well */
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if (!p && !(dev->priv_flags & IFF_EBRIDGE))
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return -EINVAL;
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err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
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afspec, RTM_DELLINK);
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return err;
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}
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static int br_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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return 0;
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}
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static int br_dev_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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struct net_bridge *br = netdev_priv(dev);
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if (tb[IFLA_ADDRESS]) {
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spin_lock_bh(&br->lock);
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br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
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spin_unlock_bh(&br->lock);
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}
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return register_netdevice(dev);
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}
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static int br_port_slave_changelink(struct net_device *brdev,
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struct net_device *dev,
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struct nlattr *tb[],
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struct nlattr *data[])
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{
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if (!data)
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return 0;
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return br_setport(br_port_get_rtnl(dev), data);
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}
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static int br_port_fill_slave_info(struct sk_buff *skb,
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const struct net_device *brdev,
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|
const struct net_device *dev)
|
|
{
|
|
return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
|
|
}
|
|
|
|
static size_t br_port_get_slave_size(const struct net_device *brdev,
|
|
const struct net_device *dev)
|
|
{
|
|
return br_port_info_size();
|
|
}
|
|
|
|
static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
|
|
[IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
|
|
[IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
|
|
[IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
|
|
struct nlattr *data[])
|
|
{
|
|
struct net_bridge *br = netdev_priv(brdev);
|
|
int err;
|
|
|
|
if (!data)
|
|
return 0;
|
|
|
|
if (data[IFLA_BR_FORWARD_DELAY]) {
|
|
err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (data[IFLA_BR_HELLO_TIME]) {
|
|
err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (data[IFLA_BR_MAX_AGE]) {
|
|
err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t br_get_size(const struct net_device *brdev)
|
|
{
|
|
return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
|
|
nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
|
|
nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
|
|
0;
|
|
}
|
|
|
|
static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(brdev);
|
|
u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
|
|
u32 hello_time = jiffies_to_clock_t(br->hello_time);
|
|
u32 age_time = jiffies_to_clock_t(br->max_age);
|
|
|
|
if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
|
|
nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
|
|
nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t br_get_link_af_size(const struct net_device *dev)
|
|
{
|
|
struct net_port_vlans *pv;
|
|
|
|
if (br_port_exists(dev))
|
|
pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
|
|
else if (dev->priv_flags & IFF_EBRIDGE)
|
|
pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
|
|
else
|
|
return 0;
|
|
|
|
if (!pv)
|
|
return 0;
|
|
|
|
/* Each VLAN is returned in bridge_vlan_info along with flags */
|
|
return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
|
|
}
|
|
|
|
static struct rtnl_af_ops br_af_ops = {
|
|
.family = AF_BRIDGE,
|
|
.get_link_af_size = br_get_link_af_size,
|
|
};
|
|
|
|
struct rtnl_link_ops br_link_ops __read_mostly = {
|
|
.kind = "bridge",
|
|
.priv_size = sizeof(struct net_bridge),
|
|
.setup = br_dev_setup,
|
|
.maxtype = IFLA_BRPORT_MAX,
|
|
.policy = br_policy,
|
|
.validate = br_validate,
|
|
.newlink = br_dev_newlink,
|
|
.changelink = br_changelink,
|
|
.dellink = br_dev_delete,
|
|
.get_size = br_get_size,
|
|
.fill_info = br_fill_info,
|
|
|
|
.slave_maxtype = IFLA_BRPORT_MAX,
|
|
.slave_policy = br_port_policy,
|
|
.slave_changelink = br_port_slave_changelink,
|
|
.get_slave_size = br_port_get_slave_size,
|
|
.fill_slave_info = br_port_fill_slave_info,
|
|
};
|
|
|
|
int __init br_netlink_init(void)
|
|
{
|
|
int err;
|
|
|
|
br_mdb_init();
|
|
rtnl_af_register(&br_af_ops);
|
|
|
|
err = rtnl_link_register(&br_link_ops);
|
|
if (err)
|
|
goto out_af;
|
|
|
|
return 0;
|
|
|
|
out_af:
|
|
rtnl_af_unregister(&br_af_ops);
|
|
br_mdb_uninit();
|
|
return err;
|
|
}
|
|
|
|
void br_netlink_fini(void)
|
|
{
|
|
br_mdb_uninit();
|
|
rtnl_af_unregister(&br_af_ops);
|
|
rtnl_link_unregister(&br_link_ops);
|
|
}
|