cregit-Linux how code gets into the kernel

Release 4.11 net/xfrm/xfrm_output.c

Directory: net/xfrm
/*
 * xfrm_output.c - Common IPsec encapsulation code.
 *
 * Copyright (c) 2007 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/errno.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/xfrm.h>

static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb);


static int xfrm_skb_check_space(struct sk_buff *skb) { struct dst_entry *dst = skb_dst(skb); int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) - skb_headroom(skb); int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); if (nhead <= 0) { if (ntail <= 0) return 0; nhead = 0; } else if (ntail < 0) ntail = 0; return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu7778.57%350.00%
Johannes Berg1717.35%116.67%
Eric Dumazet33.06%116.67%
Steffen Klassert11.02%116.67%
Total98100.00%6100.00%

/* Children define the path of the packet through the * Linux networking. Thus, destinations are stackable. */
static struct dst_entry *skb_dst_pop(struct sk_buff *skb) { struct dst_entry *child = dst_clone(skb_dst(skb)->child); skb_dst_drop(skb); return child; }

Contributors

PersonTokensPropCommitsCommitProp
Ying Xue36100.00%1100.00%
Total36100.00%1100.00%


static int xfrm_output_one(struct sk_buff *skb, int err) { struct dst_entry *dst = skb_dst(skb); struct xfrm_state *x = dst->xfrm; struct net *net = xs_net(x); if (err <= 0) goto resume; do { err = xfrm_skb_check_space(skb); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); goto error_nolock; } err = x->outer_mode->output(x, skb); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); goto error_nolock; } spin_lock_bh(&x->lock); if (unlikely(x->km.state != XFRM_STATE_VALID)) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID); err = -EINVAL; goto error; } err = xfrm_state_check_expire(x); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED); goto error; } err = x->repl->overflow(x, skb); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR); goto error; } x->curlft.bytes += skb->len; x->curlft.packets++; spin_unlock_bh(&x->lock); skb_dst_force(skb); /* Inner headers are invalid now. */ skb->encapsulation = 0; err = x->type->output(x, skb); if (err == -EINPROGRESS) goto out; resume: if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); goto error_nolock; } dst = skb_dst_pop(skb); if (!dst) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); err = -EHOSTUNREACH; goto error_nolock; } skb_dst_set(skb, dst); x = dst->xfrm; } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)); return 0; error: spin_unlock_bh(&x->lock); error_nolock: kfree_skb(skb); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu22161.73%1137.93%
Masahide Nakamura3810.61%310.34%
Li RongQing256.98%26.90%
Alexey Dobriyan226.15%26.90%
Steffen Klassert226.15%517.24%
Eric Dumazet123.35%26.90%
Jean Sacren71.96%13.45%
Paul Moore61.68%26.90%
Timo Teräs51.40%13.45%
Total358100.00%29100.00%


int xfrm_output_resume(struct sk_buff *skb, int err) { struct net *net = xs_net(skb_dst(skb)->xfrm); while (likely((err = xfrm_output_one(skb, err)) == 0)) { nf_reset(skb); err = skb_dst(skb)->ops->local_out(net, skb->sk, skb); if (unlikely(err != 1)) goto out; if (!skb_dst(skb)->xfrm) return dst_output(net, skb->sk, skb); err = nf_hook(skb_dst(skb)->ops->family, NF_INET_POST_ROUTING, net, skb->sk, skb, NULL, skb_dst(skb)->dev, xfrm_output2); if (unlikely(err != 1)) goto out; } if (err == -EINPROGRESS) err = 0; out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu11970.00%216.67%
Eric W. Biedermann2917.06%541.67%
Eric Dumazet127.06%18.33%
David S. Miller52.94%216.67%
Jean-Christophe Dubois31.76%18.33%
Kazunori Miyazawa21.18%18.33%
Total170100.00%12100.00%

EXPORT_SYMBOL_GPL(xfrm_output_resume);
static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb) { return xfrm_output_resume(skb, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu1965.52%250.00%
David S. Miller517.24%125.00%
Eric W. Biedermann517.24%125.00%
Total29100.00%4100.00%


static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb) { struct sk_buff *segs; BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_SGO_CB_OFFSET); BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_SGO_CB_OFFSET); segs = skb_gso_segment(skb, 0); kfree_skb(skb); if (IS_ERR(segs)) return PTR_ERR(segs); if (segs == NULL) return -EINVAL; do { struct sk_buff *nskb = segs->next; int err; segs->next = NULL; err = xfrm_output2(net, sk, segs); if (unlikely(err)) { kfree_skb_list(nskb); return err; } segs = nskb; } while (segs); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu9864.47%228.57%
Konstantin Khlebnikov2818.42%114.29%
Florian Westphal127.89%228.57%
David S. Miller74.61%114.29%
Eric W. Biedermann74.61%114.29%
Total152100.00%7100.00%


int xfrm_output(struct sock *sk, struct sk_buff *skb) { struct net *net = dev_net(skb_dst(skb)->dev); int err; if (skb_is_gso(skb)) return xfrm_output_gso(net, sk, skb); if (skb->ip_summed == CHECKSUM_PARTIAL) { err = skb_checksum_help(skb); if (err) { XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); kfree_skb(skb); return err; } } return xfrm_output2(net, sk, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu6364.29%116.67%
Alexey Dobriyan1414.29%116.67%
David S. Miller99.18%116.67%
Masahide Nakamura55.10%116.67%
Eric W. Biedermann44.08%116.67%
Eric Dumazet33.06%116.67%
Total98100.00%6100.00%

EXPORT_SYMBOL_GPL(xfrm_output);
int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) { struct xfrm_mode *inner_mode; if (x->sel.family == AF_UNSPEC) inner_mode = xfrm_ip2inner_mode(x, xfrm_af2proto(skb_dst(skb)->ops->family)); else inner_mode = x->inner_mode; if (inner_mode == NULL) return -EAFNOSUPPORT; return inner_mode->afinfo->extract_output(x, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa7596.15%150.00%
Eric Dumazet33.85%150.00%
Total78100.00%2100.00%

EXPORT_SYMBOL_GPL(xfrm_inner_extract_output);
void xfrm_local_error(struct sk_buff *skb, int mtu) { unsigned int proto; struct xfrm_state_afinfo *afinfo; if (skb->protocol == htons(ETH_P_IP)) proto = AF_INET; else if (skb->protocol == htons(ETH_P_IPV6)) proto = AF_INET6; else return; afinfo = xfrm_state_get_afinfo(proto); if (afinfo) afinfo->local_error(skb, mtu); rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa7697.44%266.67%
Florian Westphal22.56%133.33%
Total78100.00%3100.00%

EXPORT_SYMBOL_GPL(xfrm_local_error);

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu63754.63%1426.92%
Hannes Frederic Sowa816.95%23.85%
Kazunori Miyazawa776.60%11.92%
Eric W. Biedermann504.29%611.54%
Masahide Nakamura433.69%35.77%
Ying Xue373.17%11.92%
Alexey Dobriyan363.09%23.85%
Eric Dumazet332.83%23.85%
David S. Miller312.66%23.85%
Konstantin Khlebnikov282.40%11.92%
Li RongQing252.14%23.85%
Steffen Klassert231.97%59.62%
Johannes Berg171.46%11.92%
Florian Westphal141.20%35.77%
Fabian Frederick100.86%11.92%
Jean Sacren70.60%11.92%
Paul Moore60.51%23.85%
Timo Teräs50.43%11.92%
Jean-Christophe Dubois30.26%11.92%
Tejun Heo30.26%11.92%
Total1166100.00%52100.00%
Directory: net/xfrm
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