Release 4.11 net/ipv4/xfrm4_input.c

/*
 * xfrm4_input.c
 *
 * Changes:
 *      YOSHIFUJI Hideaki @USAGI
 *              Split up af-specific portion
 *      Derek Atkins <derek@ihtfp.com>
 *              Add Encapsulation support
 *
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <net/ip.h>
#include <net/xfrm.h>



int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb)
{
	return xfrm4_extract_header(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%



static inline int xfrm4_rcv_encap_finish(struct net *net, struct sock *sk,
					 struct sk_buff *skb)
{
	if (!skb_dst(skb)) {
		const struct iphdr *iph = ip_hdr(skb);

		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
					 iph->tos, skb->dev))
			goto drop;
	}
	return dst_input(skb);
drop:
	kfree_skb(skb);
	return NET_RX_DROP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
59
69.41%
1
14.29%
Arnaldo Carvalho de Melo
11
12.94%
1
14.29%
David S. Miller
6
7.06%
2
28.57%
Eric W. Biedermann
5
5.88%
1
14.29%
Eric Dumazet
3
3.53%
1
14.29%
Ian Morris
1
1.18%
1
14.29%
Total
85
100.00%
7
100.00%



int xfrm4_transport_finish(struct sk_buff *skb, int async)
{
	struct xfrm_offload *xo = xfrm_offload(skb);
	struct iphdr *iph = ip_hdr(skb);

	iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;

#ifndef CONFIG_NETFILTER
	if (!async)
		return -iph->protocol;
#endif

	__skb_push(skb, skb->data - skb_network_header(skb));
	iph->tot_len = htons(skb->len);
	ip_send_check(iph);

	if (xo && (xo->flags & XFRM_GRO)) {
		skb_mac_header_rebuild(skb);
		return 0;
	}

	NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING,
		dev_net(skb->dev), NULL, skb, skb->dev, NULL,
		xfrm4_rcv_encap_finish);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
46
32.62%
3
27.27%
Patrick McHardy
45
31.91%
2
18.18%
Steffen Klassert
32
22.70%
1
9.09%
Eric W. Biedermann
7
4.96%
1
9.09%
Hideaki Yoshifuji / 吉藤英明
5
3.55%
1
9.09%
Arnaldo Carvalho de Melo
3
2.13%
1
9.09%
David S. Miller
2
1.42%
1
9.09%
Jan Engelhardt
1
0.71%
1
9.09%
Total
141
100.00%
11
100.00%

/* If it's a keepalive packet, then just eat it.
 * If it's an encapsulated packet, then pass it to the
 * IPsec xfrm input.
 * Returns 0 if skb passed to xfrm or was dropped.
 * Returns >0 if skb should be passed to UDP.
 * Returns <0 if skb should be resubmitted (-ret is protocol)
 */


int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct udp_sock *up = udp_sk(sk);
	struct udphdr *uh;
	struct iphdr *iph;
	int iphlen, len;

	__u8 *udpdata;
	__be32 *udpdata32;
	__u16 encap_type = up->encap_type;

	/* if this is not encapsulated socket, then just return now */
	if (!encap_type)
		return 1;

	/* If this is a paged skb, make sure we pull up
         * whatever data we need to look at. */
	len = skb->len - sizeof(struct udphdr);
	if (!pskb_may_pull(skb, sizeof(struct udphdr) + min(len, 8)))
		return 1;

	/* Now we can get the pointers */
	uh = udp_hdr(skb);
	udpdata = (__u8 *)uh + sizeof(struct udphdr);
	udpdata32 = (__be32 *)udpdata;

	switch (encap_type) {
	default:
	case UDP_ENCAP_ESPINUDP:
		/* Check if this is a keepalive packet.  If so, eat it. */
		if (len == 1 && udpdata[0] == 0xff) {
			goto drop;
		} else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0) {
			/* ESP Packet without Non-ESP header */
			len = sizeof(struct udphdr);
		} else
			/* Must be an IKE packet.. pass it through */
			return 1;
		break;
	case UDP_ENCAP_ESPINUDP_NON_IKE:
		/* Check if this is a keepalive packet.  If so, eat it. */
		if (len == 1 && udpdata[0] == 0xff) {
			goto drop;
		} else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) &&
			   udpdata32[0] == 0 && udpdata32[1] == 0) {

			/* ESP Packet with Non-IKE marker */
			len = sizeof(struct udphdr) + 2 * sizeof(u32);
		} else
			/* Must be an IKE packet.. pass it through */
			return 1;
		break;
	}

	/* At this point we are sure that this is an ESPinUDP packet,
         * so we need to remove 'len' bytes from the packet (the UDP
         * header and optional ESP marker bytes) and then modify the
         * protocol to ESP, and then call into the transform receiver.
         */
	if (skb_unclone(skb, GFP_ATOMIC))
		goto drop;

	/* Now we can update and verify the packet length... */
	iph = ip_hdr(skb);
	iphlen = iph->ihl << 2;
	iph->tot_len = htons(ntohs(iph->tot_len) - len);
	if (skb->len < iphlen + len) {
		/* packet is too small!?! */
		goto drop;
	}

	/* pull the data buffer up to the ESP header and set the
         * transport header to point to ESP.  Keep UDP on the stack
         * for later.
         */
	__skb_pull(skb, len);
	skb_reset_transport_header(skb);

	/* process ESP */
	return xfrm4_rcv_encap(skb, IPPROTO_ESP, 0, encap_type);

drop:
	kfree_skb(skb);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
James Chapman
364
98.38%
1
25.00%
Herbert Xu
5
1.35%
2
50.00%
Pravin B Shelar
1
0.27%
1
25.00%
Total
370
100.00%
4
100.00%



int xfrm4_rcv(struct sk_buff *skb)
{
	return xfrm4_rcv_spi(skb, ip_hdr(skb)->protocol, 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
James Chapman
17
68.00%
1
50.00%
Herbert Xu
8
32.00%
1
50.00%
Total
25
100.00%
2
100.00%


EXPORT_SYMBOL(xfrm4_rcv);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
James Chapman
387
57.76%
1
4.00%
Patrick McHardy
110
16.42%
2
8.00%
Herbert Xu
86
12.84%
8
32.00%
Steffen Klassert
32
4.78%
1
4.00%
Arnaldo Carvalho de Melo
14
2.09%
2
8.00%
Hideaki Yoshifuji / 吉藤英明
12
1.79%
2
8.00%
Eric W. Biedermann
12
1.79%
2
8.00%
David S. Miller
8
1.19%
2
8.00%
Tejun Heo
3
0.45%
1
4.00%
Eric Dumazet
3
0.45%
1
4.00%
Jan Engelhardt
1
0.15%
1
4.00%
Pravin B Shelar
1
0.15%
1
4.00%
Ian Morris
1
0.15%
1
4.00%
Total
670
100.00%
25
100.00%
Directory: net/ipv4

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.