Release 4.14 net/ipv4/xfrm4_mode_tunnel.c

/*
 * 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);
}

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4
10.26%
2
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/* 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_inner_network_header(skb, skb_network_offset(skb));
	skb_set_inner_transport_header(skb, skb_transport_offset(skb));

	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;
}

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Miika Komu
30
10.91%
1
6.25%
Nicolas Dichtel
28
10.18%
1
6.25%
Ilan Tayari
20
7.27%
1
6.25%
Eric Dumazet
13
4.73%
2
12.50%
Hannes Frederic Sowa
7
2.55%
1
6.25%
Steffen Klassert
7
2.55%
1
6.25%
Kazunori Miyazawa
6
2.18%
1
6.25%
Jamal Hadi Salim
5
1.82%
1
6.25%
Arnaldo Carvalho de Melo
3
1.09%
1
6.25%
David S. Miller
1
0.36%
1
6.25%
Total
275
100.00%
16
100.00%



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;
}

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27.27%
Stephen Hemminger
4
3.05%
1
9.09%
Miika Komu
3
2.29%
1
9.09%
Eric Dumazet
2
1.53%
1
9.09%
Pravin B Shelar
1
0.76%
1
9.09%
Total
131
100.00%
11
100.00%



static struct sk_buff *xfrm4_mode_tunnel_gso_segment(struct xfrm_state *x,
						     struct sk_buff *skb,
						     netdev_features_t features)
{
	__skb_push(skb, skb->mac_len);
	return skb_mac_gso_segment(skb, features);

}

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static void xfrm4_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)
{
	struct xfrm_offload *xo = xfrm_offload(skb);

	if (xo->flags & XFRM_GSO_SEGMENT) {
		skb->network_header = skb->network_header - x->props.header_len;
		skb->transport_header = skb->network_header +
					sizeof(struct iphdr);
	}

	skb_reset_mac_len(skb);
	pskb_pull(skb, skb->mac_len + x->props.header_len);
}

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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,
	.gso_segment = xfrm4_mode_tunnel_gso_segment,
	.xmit = xfrm4_mode_tunnel_xmit,
	.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);
}

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static void __exit xfrm4_mode_tunnel_exit(void)
{
	int err;

	err = xfrm_unregister_mode(&xfrm4_tunnel_mode, AF_INET);
	BUG_ON(err);
}

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module_init(xfrm4_mode_tunnel_init);

module_exit(xfrm4_mode_tunnel_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TUNNEL);
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Steffen Klassert
139
19.36%
2
6.90%
Miika Komu
41
5.71%
1
3.45%
Nicolas Dichtel
28
3.90%
1
3.45%
Ilan Tayari
20
2.79%
1
3.45%
Eric Dumazet
15
2.09%
3
10.34%
Arnaldo Carvalho de Melo
14
1.95%
5
17.24%
Hannes Frederic Sowa
7
0.97%
1
3.45%
Kazunori Miyazawa
6
0.84%
1
3.45%
Jamal Hadi Salim
5
0.70%
1
3.45%
Stephen Hemminger
4
0.56%
1
3.45%
Tejun Heo
3
0.42%
1
3.45%
Pravin B Shelar
1
0.14%
1
3.45%
David S. Miller
1
0.14%
1
3.45%
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29
100.00%
Directory: net/ipv4

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