We pass IFLA_BRPORT_MAX to nla_parse_nested() so we need IFLA_BRPORT_MAX + 1 elements. Also Smatch complains that we read past the end of the array when in br_set_port_flag() when it's called with IFLA_BRPORT_FAST_LEAVE. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
309 lines
7.9 KiB
C
309 lines
7.9 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 "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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+ 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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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, const struct net_bridge_port *port,
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u32 pid, u32 seq, int event, unsigned int flags)
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{
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const struct net_bridge *br = port->br;
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const struct net_device *dev = port->dev;
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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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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) {
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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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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 = dev_net(port->dev);
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struct sk_buff *skb;
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int err = -ENOBUFS;
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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);
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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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if (err < 0)
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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)
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{
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int err = 0;
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struct net_bridge_port *port = br_port_get_rcu(dev);
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/* not a bridge port */
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if (!port)
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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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out:
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return err;
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}
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static const struct nla_policy ifla_brport_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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};
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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 (!netif_running(p->dev) ||
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(!netif_carrier_ok(p->dev) && state != BR_STATE_DISABLED))
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return -ENETDOWN;
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p->state = 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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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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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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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 ifinfomsg *ifm;
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struct nlattr *protinfo;
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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;
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ifm = nlmsg_data(nlh);
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protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
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if (!protinfo)
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return 0;
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p = br_port_get_rtnl(dev);
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if (!p)
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return -EINVAL;
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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, ifla_brport_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 compatability 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 == 0)
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br_ifinfo_notify(RTM_NEWLINK, p);
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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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struct rtnl_link_ops br_link_ops __read_mostly = {
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.kind = "bridge",
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.priv_size = sizeof(struct net_bridge),
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.setup = br_dev_setup,
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.validate = br_validate,
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.dellink = br_dev_delete,
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};
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int __init br_netlink_init(void)
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{
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return rtnl_link_register(&br_link_ops);
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}
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void __exit br_netlink_fini(void)
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{
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rtnl_link_unregister(&br_link_ops);
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rtnl_unregister_all(PF_BRIDGE);
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}
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