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#
# order file for git, to produce patches which are easier to review
# by diffing the important stuff like interface changes first.
#
# one-off usage:
#   git diff -O scripts/git.orderfile ...
#
# add to git config:
#   git config diff.orderFile scripts/git.orderfile
#

# Documentation
docs/*
*.texi

# build system
configure
Makefile*
*.mak

# qapi schema
qapi/*.json
qga/*.json

# headers
*.h

# decoding tree specification
*.decode

# code
*.c
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2025-02-01 19:43:22 +0100
129' href='#n129'>129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 
/*
 *	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;

	pr_debug("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;

	pr_debug("bridge notify event=%d\n", 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) {
		/* not a bridge port */
		if (dev->br_port == NULL || idx < cb->args[0])
			goto skip;

		if (br_fill_ifinfo(skb, dev->br_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 = dev->br_port;
	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);
}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2025-02-01 19:43:21 +0100