cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/xfrm4_mode_transport.c

Directory: net/ipv4
/*
 * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
 *
 * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/stringify.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>

/* Add encapsulation header.
 *
 * The IP header will be moved forward to make space for the encapsulation
 * header.
 */

static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) { struct iphdr *iph = ip_hdr(skb); int ihl = iph->ihl * 4; skb_set_network_header(skb, -x->props.header_len); skb->mac_header = skb->network_header + offsetof(struct iphdr, protocol); skb->transport_header = skb->network_header + ihl; __skb_pull(skb, ihl); memmove(skb_network_header(skb), iph, ihl); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu6972.63%342.86%
Arnaldo Carvalho de Melo2122.11%342.86%
Jamal Hadi Salim55.26%114.29%
Total95100.00%7100.00%

/* Remove encapsulation header. * * The IP header will be moved over the top of the encapsulation header. * * On entry, skb->h shall point to where the IP header should be and skb->nh * shall be set to where the IP header currently is. skb->data shall point * to the start of the payload. */
static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) { int ihl = skb->data - skb_transport_header(skb); struct xfrm_offload *xo = xfrm_offload(skb); if (skb->transport_header != skb->network_header) { memmove(skb_transport_header(skb), skb_network_header(skb), ihl); skb->network_header = skb->transport_header; } ip_hdr(skb)->tot_len = htons(skb->len + ihl); if (!xo || !(xo->flags & XFRM_GRO)) skb_reset_transport_header(skb); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu6154.95%222.22%
Arnaldo Carvalho de Melo2623.42%666.67%
Steffen Klassert2421.62%111.11%
Total111100.00%9100.00%

static struct xfrm_mode xfrm4_transport_mode = { .input = xfrm4_transport_input, .output = xfrm4_transport_output, .owner = THIS_MODULE, .encap = XFRM_MODE_TRANSPORT, };
static int __init xfrm4_transport_init(void) { return xfrm_register_mode(&xfrm4_transport_mode, AF_INET); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu18100.00%1100.00%
Total18100.00%1100.00%


static void __exit xfrm4_transport_exit(void) { int err; err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET); BUG_ON(err); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu27100.00%1100.00%
Total27100.00%1100.00%

module_init(xfrm4_transport_init); module_exit(xfrm4_transport_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu25176.76%430.77%
Arnaldo Carvalho de Melo4714.37%753.85%
Steffen Klassert247.34%17.69%
Jamal Hadi Salim51.53%17.69%
Total327100.00%13100.00%
Directory: net/ipv4
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