56989f6d85
Now genl_register_family() is the only thing (other than the users themselves, perhaps, but I didn't find any doing that) writing to the family struct. In all families that I found, genl_register_family() is only called from __init functions (some indirectly, in which case I've add __init annotations to clarifly things), so all can actually be marked __ro_after_init. This protects the data structure from accidental corruption. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
163 lines
3.3 KiB
C
163 lines
3.3 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 <linux/gfp.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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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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pr_debug("%s(): Looking for %s\n", __func__, 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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pr_debug("%s(): Switching to mode: %d\n", __func__, 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_DEFAULT_SIZE, 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_portid, info->snd_seq,
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&irda_nl_family, 0, IRDA_NL_CMD_GET_MODE);
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if (hdr == NULL) {
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ret = -EMSGSIZE;
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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_reply(msg, info);
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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 const 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 const 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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static struct genl_family irda_nl_family __ro_after_init = {
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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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.module = THIS_MODULE,
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.ops = irda_nl_ops,
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.n_ops = ARRAY_SIZE(irda_nl_ops),
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};
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int __init irda_nl_register(void)
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{
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return genl_register_family(&irda_nl_family);
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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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