cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/xt_TEE.c

Directory: net/netfilter
/*
 *      "TEE" target extension for Xtables
 *      Copyright © Sebastian Claßen, 2007
 *      Jan Engelhardt, 2007-2010
 *
 *      based on ipt_ROUTE.c from Cédric de Launois
 *      <delaunois@info.ucl.be>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      version 2 or later, as published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/route.h>
#include <linux/netfilter/x_tables.h>
#include <net/route.h>
#include <net/netfilter/ipv4/nf_dup_ipv4.h>
#include <net/netfilter/ipv6/nf_dup_ipv6.h>
#include <linux/netfilter/xt_TEE.h>


struct xt_tee_priv {
	
struct notifier_block	notifier;
	
struct xt_tee_tginfo	*tginfo;
	
int			oif;
};


static const union nf_inet_addr tee_zero_address;


static unsigned int tee_tg4(struct sk_buff *skb, const struct xt_action_param *par) { const struct xt_tee_tginfo *info = par->targinfo; int oif = info->priv ? info->priv->oif : 0; nf_dup_ipv4(xt_net(par), skb, xt_hooknum(par), &info->gw.in, oif); return XT_CONTINUE; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt4057.14%342.86%
Eric Dumazet1521.43%114.29%
Pablo Neira Ayuso1318.57%228.57%
Eric W. Biedermann22.86%114.29%
Total70100.00%7100.00%

#if IS_ENABLED(CONFIG_IPV6)
static unsigned int tee_tg6(struct sk_buff *skb, const struct xt_action_param *par) { const struct xt_tee_tginfo *info = par->targinfo; int oif = info->priv ? info->priv->oif : 0; nf_dup_ipv6(xt_net(par), skb, xt_hooknum(par), &info->gw.in6, oif); return XT_CONTINUE; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt4057.14%342.86%
Eric Dumazet1521.43%114.29%
Pablo Neira Ayuso1318.57%228.57%
Eric W. Biedermann22.86%114.29%
Total70100.00%7100.00%

#endif
static int tee_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct xt_tee_priv *priv; priv = container_of(this, struct xt_tee_priv, notifier); switch (event) { case NETDEV_REGISTER: if (!strcmp(dev->name, priv->tginfo->oif)) priv->oif = dev->ifindex; break; case NETDEV_UNREGISTER: if (dev->ifindex == priv->oif) priv->oif = -1; break; case NETDEV_CHANGENAME: if (!strcmp(dev->name, priv->tginfo->oif)) priv->oif = dev->ifindex; else if (dev->ifindex == priv->oif) priv->oif = -1; break; } return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy14798.00%150.00%
Jiri Pirko32.00%150.00%
Total150100.00%2100.00%


static int tee_tg_check(const struct xt_tgchk_param *par) { struct xt_tee_tginfo *info = par->targinfo; struct xt_tee_priv *priv; /* 0.0.0.0 and :: not allowed */ if (memcmp(&info->gw, &tee_zero_address, sizeof(tee_zero_address)) == 0) return -EINVAL; if (info->oif[0]) { int ret; if (info->oif[sizeof(info->oif)-1] != '\0') return -EINVAL; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (priv == NULL) return -ENOMEM; priv->tginfo = info; priv->oif = -1; priv->notifier.notifier_call = tee_netdev_event; info->priv = priv; ret = register_netdevice_notifier(&priv->notifier); if (ret) { kfree(priv); return ret; } } else info->priv = NULL; static_key_slow_inc(&xt_tee_enabled); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy10056.50%125.00%
Jan Engelhardt5229.38%125.00%
Gao Feng1910.73%125.00%
Florian Westphal63.39%125.00%
Total177100.00%4100.00%


static void tee_tg_destroy(const struct xt_tgdtor_param *par) { struct xt_tee_tginfo *info = par->targinfo; if (info->priv) { unregister_netdevice_notifier(&info->priv->notifier); kfree(info->priv); } static_key_slow_dec(&xt_tee_enabled); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy4688.46%150.00%
Florian Westphal611.54%150.00%
Total52100.00%2100.00%

static struct xt_target tee_tg_reg[] __read_mostly = { { .name = "TEE", .revision = 1, .family = NFPROTO_IPV4, .target = tee_tg4, .targetsize = sizeof(struct xt_tee_tginfo), .usersize = offsetof(struct xt_tee_tginfo, priv), .checkentry = tee_tg_check, .destroy = tee_tg_destroy, .me = THIS_MODULE, }, #if IS_ENABLED(CONFIG_IPV6) { .name = "TEE", .revision = 1, .family = NFPROTO_IPV6, .target = tee_tg6, .targetsize = sizeof(struct xt_tee_tginfo), .usersize = offsetof(struct xt_tee_tginfo, priv), .checkentry = tee_tg_check, .destroy = tee_tg_destroy, .me = THIS_MODULE, }, #endif };
static int __init tee_tg_init(void) { return xt_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt20100.00%1100.00%
Total20100.00%1100.00%


static void __exit tee_tg_exit(void) { xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt19100.00%1100.00%
Total19100.00%1100.00%

module_init(tee_tg_init); module_exit(tee_tg_exit); MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>"); MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); MODULE_DESCRIPTION("Xtables: Reroute packet copy"); MODULE_LICENSE("GPL"); MODULE_ALIAS("ipt_TEE"); MODULE_ALIAS("ip6t_TEE");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jan Engelhardt33342.37%321.43%
Patrick McHardy32040.71%17.14%
Eric Dumazet405.09%214.29%
Pablo Neira Ayuso313.94%214.29%
Willem de Bruijn222.80%17.14%
Gao Feng192.42%17.14%
Florian Westphal121.53%17.14%
Eric W. Biedermann40.51%17.14%
Jiri Pirko30.38%17.14%
Arnd Bergmann20.25%17.14%
Total786100.00%14100.00%
Directory: net/netfilter
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