cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/xfrm4_output.c

Directory: net/ipv4
/*
 * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
 * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter_ipv4.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>


static int xfrm4_tunnel_check_size(struct sk_buff *skb) { int mtu, ret = 0; if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE) goto out; if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df) goto out; mtu = dst_mtu(skb_dst(skb)); if (skb->len > mtu) { skb->protocol = htons(ETH_P_IP); if (skb->sk) xfrm_local_error(skb, mtu); else icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); ret = -EMSGSIZE; } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu9073.17%222.22%
Steffen Klassert2217.89%222.22%
Hannes Frederic Sowa64.88%333.33%
Arnaldo Carvalho de Melo43.25%111.11%
Américo Wang10.81%111.11%
Total123100.00%9100.00%


int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb) { int err; err = xfrm4_tunnel_check_size(skb); if (err) return err; XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol; return xfrm4_extract_header(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu52100.00%4100.00%
Total52100.00%4100.00%


int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb) { int err; err = xfrm_inner_extract_output(x, skb); if (err) return err; IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE; skb->protocol = htons(ETH_P_IP); return x->outer_mode->output2(x, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu5484.38%466.67%
Steffen Klassert914.06%116.67%
Kazunori Miyazawa11.56%116.67%
Total64100.00%6100.00%

EXPORT_SYMBOL(xfrm4_prepare_output);
int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb) { memset(IPCB(skb), 0, sizeof(*IPCB(skb))); #ifdef CONFIG_NETFILTER IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED; #endif return xfrm_output(sk, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu3664.29%240.00%
Steffen Klassert1119.64%120.00%
David S. Miller712.50%120.00%
Eric Dumazet23.57%120.00%
Total56100.00%5100.00%


static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb) { struct xfrm_state *x = skb_dst(skb)->xfrm; #ifdef CONFIG_NETFILTER if (!x) { IPCB(skb)->flags |= IPSKB_REROUTED; return dst_output(net, sk, skb); } #endif return x->outer_mode->afinfo->output_finish(sk, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2835.90%220.00%
Steffen Klassert2228.21%220.00%
David S. Miller911.54%110.00%
Patrick McHardy810.26%110.00%
Eric W. Biedermann810.26%330.00%
Eric Dumazet33.85%110.00%
Total78100.00%10100.00%


int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb) { return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb, NULL, skb_dst(skb)->dev, __xfrm4_output, !(IPCB(skb)->flags & IPSKB_REROUTED)); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy3764.91%333.33%
Eric W. Biedermann712.28%222.22%
Steffen Klassert58.77%111.11%
Eric Dumazet58.77%111.11%
David S. Miller23.51%111.11%
Jan Engelhardt11.75%111.11%
Total57100.00%9100.00%


void xfrm4_local_error(struct sk_buff *skb, u32 mtu) { struct iphdr *hdr; hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); ip_local_error(skb->sk, EMSGSIZE, hdr->daddr, inet_sk(skb->sk)->inet_dport, mtu); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa58100.00%1100.00%
Total58100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu28755.09%1029.41%
Steffen Klassert6913.24%514.71%
Hannes Frederic Sowa6412.28%38.82%
Patrick McHardy509.60%38.82%
David S. Miller183.45%12.94%
Eric W. Biedermann152.88%514.71%
Eric Dumazet101.92%25.88%
Arnaldo Carvalho de Melo40.77%12.94%
Hideaki Yoshifuji / 吉藤英明10.19%12.94%
Kazunori Miyazawa10.19%12.94%
Américo Wang10.19%12.94%
Jan Engelhardt10.19%12.94%
Total521100.00%34100.00%
Directory: net/ipv4
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