Release 4.12 net/xfrm/xfrm_output.c

/*
 * 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
Person
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CommitProp
Herbert Xu
77
78.57%
3
50.00%
Johannes Berg
17
17.35%
1
16.67%
Eric Dumazet
3
3.06%
1
16.67%
Steffen Klassert
1
1.02%
1
16.67%
Total
98
100.00%
6
100.00%

/* 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;
}

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Ying Xue
36
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36
100.00%
1
100.00%



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);

		if (xfrm_offload(skb)) {
			x->type_offload->encap(x, skb);
		} else {
			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
Person
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CommitProp
Herbert Xu
221
59.09%
11
36.67%
Masahide Nakamura
38
10.16%
3
10.00%
Steffen Klassert
38
10.16%
6
20.00%
Li RongQing
25
6.68%
2
6.67%
Alexey Dobriyan
22
5.88%
2
6.67%
Eric Dumazet
12
3.21%
2
6.67%
Jean Sacren
7
1.87%
1
3.33%
Paul Moore
6
1.60%
2
6.67%
Timo Teräs
5
1.34%
1
3.33%
Total
374
100.00%
30
100.00%



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
Person
Tokens
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Commits
CommitProp
Herbert Xu
119
70.00%
2
16.67%
Eric W. Biedermann
29
17.06%
5
41.67%
Eric Dumazet
12
7.06%
1
8.33%
David S. Miller
5
2.94%
2
16.67%
Jean-Christophe Dubois
3
1.76%
1
8.33%
Kazunori Miyazawa
2
1.18%
1
8.33%
Total
170
100.00%
12
100.00%


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
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CommitProp
Herbert Xu
19
65.52%
2
50.00%
Eric W. Biedermann
5
17.24%
1
25.00%
David S. Miller
5
17.24%
1
25.00%
Total
29
100.00%
4
100.00%



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
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CommitProp
Herbert Xu
98
64.47%
2
28.57%
Konstantin Khlebnikov
28
18.42%
1
14.29%
Florian Westphal
12
7.89%
2
28.57%
Eric W. Biedermann
7
4.61%
1
14.29%
David S. Miller
7
4.61%
1
14.29%
Total
152
100.00%
7
100.00%



int xfrm_output(struct sock *sk, struct sk_buff *skb)
{
	struct net *net = dev_net(skb_dst(skb)->dev);
	struct xfrm_state *x = skb_dst(skb)->xfrm;
	int err;

	secpath_reset(skb);
	skb->encapsulation = 0;

	if (xfrm_dev_offload_ok(skb, x)) {
		struct sec_path *sp;

		sp = secpath_dup(skb->sp);
		if (!sp) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
			kfree_skb(skb);
			return -ENOMEM;
		}
		if (skb->sp)
			secpath_put(skb->sp);
		skb->sp = sp;
		skb->encapsulation = 1;

		sp->olen++;
		sp->xvec[skb->sp->len++] = x;
		xfrm_state_hold(x);

		if (skb_is_gso(skb)) {
			skb_shinfo(skb)->gso_type |= SKB_GSO_ESP;

			return xfrm_output2(net, sk, skb);
		}

		if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)
			goto out;
	}

	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;
		}
	}

out:
	return xfrm_output2(net, sk, skb);
}
Contributors
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CommitProp
Steffen Klassert
159
59.11%
1
12.50%
Herbert Xu
63
23.42%
1
12.50%
Alexey Dobriyan
14
5.20%
1
12.50%
Ilan Tayari
12
4.46%
1
12.50%
David S. Miller
9
3.35%
1
12.50%
Masahide Nakamura
5
1.86%
1
12.50%
Eric W. Biedermann
4
1.49%
1
12.50%
Eric Dumazet
3
1.12%
1
12.50%
Total
269
100.00%
8
100.00%


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
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Kazunori Miyazawa
75
96.15%
1
50.00%
Eric Dumazet
3
3.85%
1
50.00%
Total
78
100.00%
2
100.00%


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
Person
Tokens
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CommitProp
Hannes Frederic Sowa
76
97.44%
2
66.67%
Florian Westphal
2
2.56%
1
33.33%
Total
78
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(xfrm_local_error);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
637
47.08%
14
25.93%
Steffen Klassert
198
14.63%
6
11.11%
Hannes Frederic Sowa
81
5.99%
2
3.70%
Kazunori Miyazawa
77
5.69%
1
1.85%
Eric W. Biedermann
50
3.70%
6
11.11%
Masahide Nakamura
43
3.18%
3
5.56%
Ying Xue
37
2.73%
1
1.85%
Alexey Dobriyan
36
2.66%
2
3.70%
Eric Dumazet
33
2.44%
2
3.70%
David S. Miller
31
2.29%
2
3.70%
Konstantin Khlebnikov
28
2.07%
1
1.85%
Li RongQing
25
1.85%
2
3.70%
Johannes Berg
17
1.26%
1
1.85%
Florian Westphal
14
1.03%
3
5.56%
Ilan Tayari
12
0.89%
1
1.85%
Fabian Frederick
10
0.74%
1
1.85%
Jean Sacren
7
0.52%
1
1.85%
Paul Moore
6
0.44%
2
3.70%
Timo Teräs
5
0.37%
1
1.85%
Jean-Christophe Dubois
3
0.22%
1
1.85%
Tejun Heo
3
0.22%
1
1.85%
Total
1353
100.00%
54
100.00%
Directory: net/xfrm

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