cregit-Linux how code gets into the kernel

Release 4.8 net/xfrm/xfrm_output.c

Directory: net/xfrm
 * xfrm_output.c - Common IPsec encapsulation code.
 * Copyright (c) 2007 Herbert Xu <>
 * 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); }


herbert xuherbert xu7778.57%350.00%
johannes bergjohannes berg1717.35%116.67%
eric dumazeteric dumazet33.06%116.67%
steffen klassertsteffen klassert11.02%116.67%

/* 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; }


ying xueying xue36100.00%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; }


herbert xuherbert xu22161.73%1137.93%
masahide nakamuramasahide nakamura3810.61%310.34%
li rongqingli rongqing256.98%26.90%
steffen klassertsteffen klassert226.15%517.24%
alexey dobriyanalexey dobriyan226.15%26.90%
eric dumazeteric dumazet123.35%26.90%
jean sacrenjean sacren71.96%13.45%
paul moorepaul moore61.68%26.90%
timo terastimo teras51.40%13.45%

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; }


herbert xuherbert xu11970.00%216.67%
eric w. biedermaneric w. biederman2917.06%541.67%
eric dumazeteric dumazet127.06%18.33%
david s. millerdavid s. miller52.94%216.67%
jean-christophe duboisjean-christophe dubois31.76%18.33%
kazunori miyazawakazunori miyazawa21.18%18.33%

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


herbert xuherbert xu1965.52%250.00%
eric w. biedermaneric w. biederman517.24%125.00%
david s. millerdavid s. miller517.24%125.00%

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; }


herbert xuherbert xu9864.47%228.57%
konstantin khlebnikovkonstantin khlebnikov2818.42%114.29%
florian westphalflorian westphal127.89%228.57%
eric w. biedermaneric w. biederman74.61%114.29%
david s. millerdavid s. miller74.61%114.29%

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); }


herbert xuherbert xu6364.29%116.67%
alexey dobriyanalexey dobriyan1414.29%116.67%
david s. millerdavid s. miller99.18%116.67%
masahide nakamuramasahide nakamura55.10%116.67%
eric w. biedermaneric w. biederman44.08%116.67%
eric dumazeteric dumazet33.06%116.67%

int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) { struct xfrm_mode *inner_mode; if (x-> == 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); }


kazunori miyazawakazunori miyazawa7596.15%150.00%
eric dumazeteric dumazet33.85%150.00%

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) return; afinfo->local_error(skb, mtu); xfrm_state_put_afinfo(afinfo); }


hannes frederic sowahannes frederic sowa82100.00%2100.00%


Overall Contributors

herbert xuherbert xu63754.44%1427.45%
hannes frederic sowahannes frederic sowa877.44%23.92%
kazunori miyazawakazunori miyazawa776.58%11.96%
eric w. biedermaneric w. biederman504.27%611.76%
masahide nakamuramasahide nakamura433.68%35.88%
ying xueying xue373.16%11.96%
alexey dobriyanalexey dobriyan363.08%23.92%
eric dumazeteric dumazet332.82%23.92%
david s. millerdavid s. miller312.65%23.92%
konstantin khlebnikovkonstantin khlebnikov282.39%11.96%
li rongqingli rongqing252.14%23.92%
steffen klassertsteffen klassert231.97%59.80%
johannes bergjohannes berg171.45%11.96%
florian westphalflorian westphal121.03%23.92%
fabian frederickfabian frederick100.85%11.96%
jean sacrenjean sacren70.60%11.96%
paul moorepaul moore60.51%23.92%
timo terastimo teras50.43%11.96%
tejun heotejun heo30.26%11.96%
jean-christophe duboisjean-christophe dubois30.26%11.96%
Directory: net/xfrm
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