cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/xt_CHECKSUM.c

Directory: net/netfilter
/* iptables module for the packet checksum mangling
 *
 * (C) 2002 by Harald Welte <laforge@netfilter.org>
 * (C) 2010 Red Hat, Inc.
 *
 * Author: Michael S. Tsirkin <mst@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CHECKSUM.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael S. Tsirkin <mst@redhat.com>");
MODULE_DESCRIPTION("Xtables: checksum modification");
MODULE_ALIAS("ipt_CHECKSUM");
MODULE_ALIAS("ip6t_CHECKSUM");


static unsigned int checksum_tg(struct sk_buff *skb, const struct xt_action_param *par) { if (skb->ip_summed == CHECKSUM_PARTIAL) skb_checksum_help(skb); return XT_CONTINUE; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin34100.00%1100.00%
Total34100.00%1100.00%


static int checksum_tg_check(const struct xt_tgchk_param *par) { const struct xt_CHECKSUM_info *einfo = par->targinfo; if (einfo->operation & ~XT_CHECKSUM_OP_FILL) { pr_info("unsupported CHECKSUM operation %x\n", einfo->operation); return -EINVAL; } if (!einfo->operation) { pr_info("no CHECKSUM operation enabled\n"); return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin67100.00%1100.00%
Total67100.00%1100.00%

static struct xt_target checksum_tg_reg __read_mostly = { .name = "CHECKSUM", .family = NFPROTO_UNSPEC, .target = checksum_tg, .targetsize = sizeof(struct xt_CHECKSUM_info), .table = "mangle", .checkentry = checksum_tg_check, .me = THIS_MODULE, };
static int __init checksum_tg_init(void) { return xt_register_target(&checksum_tg_reg); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin16100.00%1100.00%
Total16100.00%1100.00%


static void __exit checksum_tg_exit(void) { xt_unregister_target(&checksum_tg_reg); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin15100.00%1100.00%
Total15100.00%1100.00%

module_init(checksum_tg_init); module_exit(checksum_tg_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin234100.00%1100.00%
Total234100.00%1100.00%
Directory: net/netfilter
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