diff options
| author | Benjamin Poirier <bpoirier@suse.de> | 2012-05-24 11:32:38 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:36:15 +0900 |
| commit | 978041f2a946a4616f7cdb60f6d453ffa83298c1 (patch) | |
| tree | e5ced0504c3986e77add058bf1923cfe7b7449b2 /net/ipv6 | |
| parent | 010589e2bce841733dc989fd56c5c3aba41a759c (diff) | |
xfrm: take net hdr len into account for esp payload size calculation
[ Upstream commit 91657eafb64b4cb53ec3a2fbc4afc3497f735788 ]
Corrects the function that determines the esp payload size. The calculations
done in esp{4,6}_get_mtu() lead to overlength frames in transport mode for
certain mtu values and suboptimal frames for others.
According to what is done, mainly in esp{,6}_output() and tcp_mtu_to_mss(),
net_header_len must be taken into account before doing the alignment
calculation.
Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/esp6.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index 1ac7938dd9e..65dd5433f08 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -411,19 +411,15 @@ static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) struct esp_data *esp = x->data; u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); u32 align = max_t(u32, blksize, esp->padlen); - u32 rem; + unsigned int net_adj; - mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); - rem = mtu & (align - 1); - mtu &= ~(align - 1); - - if (x->props.mode != XFRM_MODE_TUNNEL) { - u32 padsize = ((blksize - 1) & 7) + 1; - mtu -= blksize - padsize; - mtu += min_t(u32, blksize - padsize, rem); - } + if (x->props.mode != XFRM_MODE_TUNNEL) + net_adj = sizeof(struct ipv6hdr); + else + net_adj = 0; - return mtu - 2; + return ((mtu - x->props.header_len - crypto_aead_authsize(esp->aead) - + net_adj) & ~(align - 1)) + (net_adj - 2); } static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |