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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Eric W. Biederman](/assets/img/avatar_default.png)
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
171 lines
3.4 KiB
C
171 lines
3.4 KiB
C
/*
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* IrDA netlink layer, for stack configuration.
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*
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* Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
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*
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* Partly based on the 802.11 nelink implementation
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* (see net/wireless/nl80211.c) which is:
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/socket.h>
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#include <linux/irda.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlap.h>
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#include <net/genetlink.h>
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static struct genl_family irda_nl_family = {
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.id = GENL_ID_GENERATE,
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.name = IRDA_NL_NAME,
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.hdrsize = 0,
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.version = IRDA_NL_VERSION,
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.maxattr = IRDA_NL_CMD_MAX,
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};
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static struct net_device * ifname_to_netdev(struct net *net, struct genl_info *info)
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{
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char * ifname;
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if (!info->attrs[IRDA_NL_ATTR_IFNAME])
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return NULL;
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ifname = nla_data(info->attrs[IRDA_NL_ATTR_IFNAME]);
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IRDA_DEBUG(5, "%s(): Looking for %s\n", __FUNCTION__, ifname);
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return dev_get_by_name(net, ifname);
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}
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static int irda_nl_set_mode(struct sk_buff *skb, struct genl_info *info)
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{
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struct net_device * dev;
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struct irlap_cb * irlap;
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u32 mode;
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if (!info->attrs[IRDA_NL_ATTR_MODE])
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return -EINVAL;
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mode = nla_get_u32(info->attrs[IRDA_NL_ATTR_MODE]);
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IRDA_DEBUG(5, "%s(): Switching to mode: %d\n", __FUNCTION__, mode);
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dev = ifname_to_netdev(&init_net, info);
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if (!dev)
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return -ENODEV;
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irlap = (struct irlap_cb *)dev->atalk_ptr;
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if (!irlap) {
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dev_put(dev);
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return -ENODEV;
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}
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irlap->mode = mode;
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dev_put(dev);
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return 0;
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}
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static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
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{
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struct net_device * dev;
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struct irlap_cb * irlap;
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struct sk_buff *msg;
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void *hdr;
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int ret = -ENOBUFS;
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dev = ifname_to_netdev(&init_net, info);
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if (!dev)
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return -ENODEV;
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg) {
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dev_put(dev);
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return -ENOMEM;
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}
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irlap = (struct irlap_cb *)dev->atalk_ptr;
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if (!irlap) {
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ret = -ENODEV;
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goto err_out;
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}
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hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
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&irda_nl_family, 0, IRDA_NL_CMD_GET_MODE);
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if (IS_ERR(hdr)) {
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ret = PTR_ERR(hdr);
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goto err_out;
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}
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if(nla_put_string(msg, IRDA_NL_ATTR_IFNAME,
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dev->name))
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goto err_out;
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if(nla_put_u32(msg, IRDA_NL_ATTR_MODE, irlap->mode))
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goto err_out;
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genlmsg_end(msg, hdr);
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return genlmsg_unicast(msg, info->snd_pid);
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err_out:
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nlmsg_free(msg);
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dev_put(dev);
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return ret;
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}
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static struct nla_policy irda_nl_policy[IRDA_NL_ATTR_MAX + 1] = {
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[IRDA_NL_ATTR_IFNAME] = { .type = NLA_NUL_STRING,
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.len = IFNAMSIZ-1 },
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[IRDA_NL_ATTR_MODE] = { .type = NLA_U32 },
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};
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static struct genl_ops irda_nl_ops[] = {
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{
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.cmd = IRDA_NL_CMD_SET_MODE,
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.doit = irda_nl_set_mode,
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.policy = irda_nl_policy,
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.flags = GENL_ADMIN_PERM,
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},
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{
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.cmd = IRDA_NL_CMD_GET_MODE,
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.doit = irda_nl_get_mode,
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.policy = irda_nl_policy,
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/* can be retrieved by unprivileged users */
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},
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};
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int irda_nl_register(void)
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{
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int err, i;
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err = genl_register_family(&irda_nl_family);
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if (err)
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return err;
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for (i = 0; i < ARRAY_SIZE(irda_nl_ops); i++) {
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err = genl_register_ops(&irda_nl_family, &irda_nl_ops[i]);
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if (err)
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goto err_out;
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}
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return 0;
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err_out:
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genl_unregister_family(&irda_nl_family);
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return err;
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}
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void irda_nl_unregister(void)
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{
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genl_unregister_family(&irda_nl_family);
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}
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