Commit 227620e2 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[IPSEC]: Separate inner/outer mode processing on input 



With inter-family transforms the inner mode differs from the outer
mode.  Attempting to handle both sides from the same function means
that it needs to handle both IPv4 and IPv6 which creates duplication
and confusion.

This patch separates the two parts on the input path so that each
function deals with one family only.

In particular, the functions xfrm4_extract_inut/xfrm6_extract_inut
moves the pertinent fields from the IPv4/IPv6 IP headers into a
neutral format stored in skb->cb.  This is then used by the inner mode
input functions to modify the inner IP header.  In this way the input
function no longer has to know about the outer address family.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36cf9acf

include/net/xfrm.h

+27 −0
Original line number Diff line number Diff line
@@ -258,6 +258,7 @@ extern int __xfrm_state_delete(struct xfrm_state *x); 
struct xfrm_state_afinfo {

	unsigned int		family;

	unsigned int		proto;

	unsigned int		eth_proto;

	struct module		*owner;

	struct xfrm_type	*type_map[IPPROTO_MAX];

	struct xfrm_mode	*mode_map[XFRM_MODE_MAX];
@@ -268,6 +269,8 @@ struct xfrm_state_afinfo { 
	int			(*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);

	int			(*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);

	int			(*output)(struct sk_buff *skb);

	int			(*extract_input)(struct xfrm_state *x,

						 struct sk_buff *skb);

	int			(*extract_output)(struct xfrm_state *x,

						  struct sk_buff *skb);

};
@@ -302,6 +305,27 @@ extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 
extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);



struct xfrm_mode {

	/*

	 * Remove encapsulation header.

	 *

	 * The IP header will be moved over the top of the encapsulation

	 * header.

	 *

	 * On entry, the transport header shall point to where the IP header

	 * should be and the network header shall be set to where the IP

	 * header currently is.  skb->data shall point to the start of the

	 * payload.

	 */

	int (*input2)(struct xfrm_state *x, struct sk_buff *skb);



	/*

	 * This is the actual input entry point.

	 *

	 * For transport mode and equivalent this would be identical to

	 * input2 (which does not need to be set).  While tunnel mode

	 * and equivalent would set this to the tunnel encapsulation function

	 * xfrm4_prepare_input that would in turn call input2.

	 */

	int (*input)(struct xfrm_state *x, struct sk_buff *skb);



	/*
@@ -1093,8 +1117,10 @@ extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 
extern void xfrm_replay_notify(struct xfrm_state *x, int event);

extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);

extern int xfrm_init_state(struct xfrm_state *x);

extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);

extern int xfrm_output(struct sk_buff *skb);

extern int xfrm4_extract_header(struct sk_buff *skb);

extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);

extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,

			   int encap_type);

extern int xfrm4_rcv(struct sk_buff *skb);
@@ -1110,6 +1136,7 @@ extern int xfrm4_output(struct sk_buff *skb); 
extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);

extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);

extern int xfrm6_extract_header(struct sk_buff *skb);

extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);

extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);

extern int xfrm6_rcv(struct sk_buff *skb);

extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,

net/ipv4/xfrm4_input.c

+6 −1
Original line number Diff line number Diff line
@@ -16,6 +16,11 @@ 
#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);

}



#ifdef CONFIG_NETFILTER

static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)

{
@@ -91,7 +96,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 


		xfrm_vec[xfrm_nr++] = x;



		if (x->outer_mode->input(x, skb))

		if (x->inner_mode->input(x, skb))

			goto drop;



		if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {

net/ipv4/xfrm4_mode_beet.c

+39 −28
Original line number Diff line number Diff line
@@ -17,6 +17,21 @@ 
#include <net/ip.h>

#include <net/xfrm.h>



static void xfrm4_beet_make_header(struct sk_buff *skb)

{

	struct iphdr *iph = ip_hdr(skb);



	iph->ihl = 5;

	iph->version = 4;



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

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



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

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

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

}



/* Add encapsulation header.

 *

 * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
@@ -40,20 +55,12 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb) 
			  offsetof(struct iphdr, protocol);

	skb->transport_header = skb->network_header + sizeof(*iph);



	xfrm4_beet_make_header(skb);



	ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);



	top_iph = ip_hdr(skb);



	top_iph->ihl = 5;

	top_iph->version = 4;



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

	top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;



	top_iph->id = XFRM_MODE_SKB_CB(skb)->id;

	top_iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;

	top_iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;



	if (unlikely(optlen)) {

		BUG_ON(optlen < 0);
@@ -75,43 +82,46 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb) 


static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)

{

	struct iphdr *iph = ip_hdr(skb);

	int phlen = 0;

	struct iphdr *iph;

	int optlen = 0;

	u8 ph_nexthdr = 0;

	int err = -EINVAL;



	if (unlikely(iph->protocol == IPPROTO_BEETPH)) {

	if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {

		struct ip_beet_phdr *ph;

		int phlen;



		if (!pskb_may_pull(skb, sizeof(*ph)))

			goto out;

		ph = (struct ip_beet_phdr *)(ipip_hdr(skb) + 1);



		ph = (struct ip_beet_phdr *)skb->data;



		phlen = sizeof(*ph) + ph->padlen;

		optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);

		if (optlen < 0 || optlen & 3 || optlen > 250)

			goto out;



		if (!pskb_may_pull(skb, phlen + optlen))

			goto out;

		skb->len -= phlen + optlen;

		XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;



		ph_nexthdr = ph->nexthdr;

		if (!pskb_may_pull(skb, phlen));

			goto out;

		__skb_pull(skb, phlen);

	}



	skb_set_network_header(skb, phlen - sizeof(*iph));

	memmove(skb_network_header(skb), iph, sizeof(*iph));

	skb_set_transport_header(skb, phlen + optlen);

	skb->data = skb_transport_header(skb);

	skb_push(skb, sizeof(*iph));

	skb_reset_network_header(skb);



	memmove(skb->data - skb->mac_len, skb_mac_header(skb),

		skb->mac_len);

	skb_set_mac_header(skb, -skb->mac_len);



	xfrm4_beet_make_header(skb);



	iph = ip_hdr(skb);

	iph->ihl = (sizeof(*iph) + optlen) / 4;

	iph->tot_len = htons(skb->len + iph->ihl * 4);



	iph->ihl += optlen / 4;

	iph->tot_len = htons(skb->len);

	iph->daddr = x->sel.daddr.a4;

	iph->saddr = x->sel.saddr.a4;

	if (ph_nexthdr)

		iph->protocol = ph_nexthdr;

	iph->check = 0;

	iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);

	err = 0;
@@ -120,7 +130,8 @@ out: 
}



static struct xfrm_mode xfrm4_beet_mode = {

	.input = xfrm4_beet_input,

	.input2 = xfrm4_beet_input,

	.input = xfrm_prepare_input,

	.output2 = xfrm4_beet_output,

	.output = xfrm4_prepare_output,

	.owner = THIS_MODULE,

net/ipv4/xfrm4_mode_tunnel.c

+10 −34
Original line number Diff line number Diff line
@@ -16,19 +16,12 @@ 


static inline void ipip_ecn_decapsulate(struct sk_buff *skb)

{

	struct iphdr *outer_iph = ip_hdr(skb);

	struct iphdr *inner_iph = ipip_hdr(skb);



	if (INET_ECN_is_ce(outer_iph->tos))

	if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))

		IP_ECN_set_ce(inner_iph);

}



static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)

{

	if (INET_ECN_is_ce(iph->tos))

		IP6_ECN_set_ce(ipv6_hdr(skb));

}



/* Add encapsulation header.

 *

 * The top IP header will be constructed per RFC 2401.
@@ -72,20 +65,11 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) 


static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)

{

	struct iphdr *iph = ip_hdr(skb);

	const unsigned char *old_mac;

	int err = -EINVAL;



	switch (iph->protocol){

		case IPPROTO_IPIP:

			break;

#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)

		case IPPROTO_IPV6:

			break;

#endif

		default:

	if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)

		goto out;

	}



	if (!pskb_may_pull(skb, sizeof(struct iphdr)))

		goto out;
@@ -94,20 +78,11 @@ static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) 
	    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))

		goto out;



	iph = ip_hdr(skb);

	if (iph->protocol == IPPROTO_IPIP) {

	if (x->props.flags & XFRM_STATE_DECAP_DSCP)

			ipv4_copy_dscp(ipv4_get_dsfield(iph), ipip_hdr(skb));

		ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));

	if (!(x->props.flags & XFRM_STATE_NOECN))

		ipip_ecn_decapsulate(skb);

	}

#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)

	else {

		if (!(x->props.flags & XFRM_STATE_NOECN))

			ipip6_ecn_decapsulate(iph, skb);

		skb->protocol = htons(ETH_P_IPV6);

	}

#endif



	old_mac = skb_mac_header(skb);

	skb_set_mac_header(skb, -skb->mac_len);

	memmove(skb_mac_header(skb), old_mac, skb->mac_len);
@@ -119,7 +94,8 @@ out: 
}



static struct xfrm_mode xfrm4_tunnel_mode = {

	.input = xfrm4_tunnel_input,

	.input2 = xfrm4_tunnel_input,

	.input = xfrm_prepare_input,

	.output2 = xfrm4_tunnel_output,

	.output = xfrm4_prepare_output,

	.owner = THIS_MODULE,

net/ipv4/xfrm4_state.c

+2 −0
Original line number Diff line number Diff line
@@ -65,10 +65,12 @@ int xfrm4_extract_header(struct sk_buff *skb) 
static struct xfrm_state_afinfo xfrm4_state_afinfo = {

	.family			= AF_INET,

	.proto			= IPPROTO_IPIP,

	.eth_proto		= htons(ETH_P_IP),

	.owner			= THIS_MODULE,

	.init_flags		= xfrm4_init_flags,

	.init_tempsel		= __xfrm4_init_tempsel,

	.output			= xfrm4_output,

	.extract_input		= xfrm4_extract_input,

	.extract_output		= xfrm4_extract_output,

};

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