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Commit 040253c9 authored by Martin Willi's avatar Martin Willi Committed by David S. Miller
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xfrm: Traffic Flow Confidentiality for IPv6 ESP 



Add TFC padding to all packets smaller than the boundary configured
on the xfrm state. If the boundary is larger than the PMTU, limit
padding to the PMTU.

Signed-off-by: default avatarMartin Willi <martin@strongswan.org>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d979e20f

net/ipv6/esp6.c

+24 −8
Original line number Diff line number Diff line
@@ -49,6 +49,8 @@ struct esp_skb_cb { 


#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))



static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);



/*

 * Allocate an AEAD request structure with extra space for SG and IV.

 *
@@ -140,6 +142,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 
	int blksize;

	int clen;

	int alen;

	int plen;

	int tfclen;

	int nfrags;

	u8 *iv;

	u8 *tail;
@@ -148,18 +152,26 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 
	/* skb is pure payload to encrypt */

	err = -ENOMEM;



	/* Round to block size */

	clen = skb->len;



	aead = esp->aead;

	alen = crypto_aead_authsize(aead);



	tfclen = 0;

	if (x->tfcpad) {

		struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);

		u32 padto;



		padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));

		if (skb->len < padto)

			tfclen = padto - skb->len;

	}

	blksize = ALIGN(crypto_aead_blocksize(aead), 4);

	clen = ALIGN(clen + 2, blksize);

	clen = ALIGN(skb->len + 2 + tfclen, blksize);

	if (esp->padlen)

		clen = ALIGN(clen, esp->padlen);

	plen = clen - skb->len - tfclen;



	if ((err = skb_cow_data(skb, clen - skb->len + alen, &trailer)) < 0)

	err = skb_cow_data(skb, tfclen + plen + alen, &trailer);

	if (err < 0)

		goto error;

	nfrags = err;
@@ -174,13 +186,17 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) 


	/* Fill padding... */

	tail = skb_tail_pointer(trailer);

	if (tfclen) {

		memset(tail, 0, tfclen);

		tail += tfclen;

	}

	do {

		int i;

		for (i=0; i<clen-skb->len - 2; i++)

		for (i = 0; i < plen - 2; i++)

			tail[i] = i + 1;

	} while (0);

	tail[clen-skb->len - 2] = (clen - skb->len) - 2;

	tail[clen - skb->len - 1] = *skb_mac_header(skb);

	tail[plen - 2] = plen - 2;

	tail[plen - 1] = *skb_mac_header(skb);

	pskb_put(skb, trailer, clen - skb->len + alen);



	skb_push(skb, -skb_network_offset(skb));