cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/xfrm4_mode_tunnel.c

Directory: net/ipv4
/*
 * xfrm4_mode_tunnel.c - Tunnel mode encapsulation for IPv4.
 *
 * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <linux/gfp.h>
#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/inet_ecn.h>
#include <net/ip.h>
#include <net/xfrm.h>


static inline void ipip_ecn_decapsulate(struct sk_buff *skb) { struct iphdr *inner_iph = ipip_hdr(skb); if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) IP_ECN_set_ce(inner_iph); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2769.23%240.00%
Miika Komu820.51%120.00%
Arnaldo Carvalho de Melo410.26%240.00%
Total39100.00%5100.00%

/* Add encapsulation header. * * The top IP header will be constructed per RFC 2401. */
static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) { struct dst_entry *dst = skb_dst(skb); struct iphdr *top_iph; int flags; 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 + sizeof(*top_iph); top_iph = ip_hdr(skb); top_iph->ihl = 5; top_iph->version = 4; top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family); /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */ if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) top_iph->tos = 0; else top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos; top_iph->tos = INET_ECN_encapsulate(top_iph->tos, XFRM_MODE_SKB_CB(skb)->tos); flags = x->props.flags; if (flags & XFRM_STATE_NOECN) IP_ECN_clear(top_iph); top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ? 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF)); top_iph->ttl = ip4_dst_hoplimit(dst->child); top_iph->saddr = x->props.saddr.a4; top_iph->daddr = x->id.daddr.a4; ip_select_ident(dev_net(dst->dev), skb, NULL); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu15560.78%533.33%
Miika Komu3011.76%16.67%
Nicolas Dichtel2810.98%16.67%
Eric Dumazet135.10%213.33%
Steffen Klassert72.75%16.67%
Hannes Frederic Sowa72.75%16.67%
Kazunori Miyazawa62.35%16.67%
Jamal Hadi Salim51.96%16.67%
Arnaldo Carvalho de Melo31.18%16.67%
David S. Miller10.39%16.67%
Total255100.00%15100.00%


static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) { int err = -EINVAL; if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) goto out; if (!pskb_may_pull(skb, sizeof(struct iphdr))) goto out; err = skb_unclone(skb, GFP_ATOMIC); if (err) goto out; if (x->props.flags & XFRM_STATE_DECAP_DSCP) ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); if (!(x->props.flags & XFRM_STATE_NOECN)) ipip_ecn_decapsulate(skb); skb_reset_network_header(skb); skb_mac_header_rebuild(skb); err = 0; out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu11487.02%436.36%
Arnaldo Carvalho de Melo75.34%327.27%
Stephen Hemminger43.05%19.09%
Miika Komu32.29%19.09%
Eric Dumazet21.53%19.09%
Pravin B Shelar10.76%19.09%
Total131100.00%11100.00%

static struct xfrm_mode xfrm4_tunnel_mode = { .input2 = xfrm4_mode_tunnel_input, .input = xfrm_prepare_input, .output2 = xfrm4_mode_tunnel_output, .output = xfrm4_prepare_output, .owner = THIS_MODULE, .encap = XFRM_MODE_TUNNEL, .flags = XFRM_MODE_FLAG_TUNNEL, };
static int __init xfrm4_mode_tunnel_init(void) { return xfrm_register_mode(&xfrm4_tunnel_mode, AF_INET); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu18100.00%2100.00%
Total18100.00%2100.00%


static void __exit xfrm4_mode_tunnel_exit(void) { int err; err = xfrm_unregister_mode(&xfrm4_tunnel_mode, AF_INET); BUG_ON(err); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu27100.00%2100.00%
Total27100.00%2100.00%

module_init(xfrm4_mode_tunnel_init); module_exit(xfrm4_mode_tunnel_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TUNNEL);

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu43476.68%933.33%
Miika Komu417.24%13.70%
Nicolas Dichtel284.95%13.70%
Eric Dumazet152.65%311.11%
Arnaldo Carvalho de Melo142.47%518.52%
Steffen Klassert71.24%13.70%
Hannes Frederic Sowa71.24%13.70%
Kazunori Miyazawa61.06%13.70%
Jamal Hadi Salim50.88%13.70%
Stephen Hemminger40.71%13.70%
Tejun Heo30.53%13.70%
Pravin B Shelar10.18%13.70%
David S. Miller10.18%13.70%
Total566100.00%27100.00%
Directory: net/ipv4
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