[XFRM]: beet: fix pseudo header length value draft-nikander-esp-beet-mode-07.txt is not entirely clear on how the length value of the pseudo header should be calculated, it states "The Header Length field contains the length of the pseudo header, IPv4 options, and padding in 8 octets units.", but also states "Length in octets (Header Len + 1) * 8". draft-nikander-esp-beet-mode-08-pre1.txt [1] clarifies this, the header length should not include the first 8 byte.
This change affects backwards compatibility, but option encapsulation didn't work until very recently anyway. [1] http://users.piuha.net/jmelen/BEET/draft-nikander-esp-beet-mode-08-pre1.txt Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]> --- commit 4b33b63040d82c55a90eb8ff2d6054bf719514f6 tree c23f5b82272fcef02e804314971b55728185cab7 parent 0f851021c0f91e5073fa89f26b5ac68e23df8e11 author Patrick McHardy <[EMAIL PROTECTED]> Mon, 23 Apr 2007 13:26:27 +0200 committer Patrick McHardy <[EMAIL PROTECTED]> Mon, 23 Apr 2007 13:26:27 +0200 net/ipv4/xfrm4_mode_beet.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c index f68dfd8..d419e15 100644 --- a/net/ipv4/xfrm4_mode_beet.c +++ b/net/ipv4/xfrm4_mode_beet.c @@ -52,7 +52,7 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb) ph = (struct ip_beet_phdr *)skb->h.raw; ph->padlen = 4 - (optlen & 4); - ph->hdrlen = (optlen + ph->padlen + sizeof(*ph)) / 8; + ph->hdrlen = optlen / 8; ph->nexthdr = top_iph->protocol; if (ph->padlen) memset(ph + 1, IPOPT_NOP, ph->padlen); @@ -85,7 +85,7 @@ static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb) ph = (struct ip_beet_phdr *)(skb->h.ipiph + 1); phlen = sizeof(*ph) + ph->padlen; - optlen = ph->hdrlen * 8 - phlen; + optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); if (optlen < 0 || optlen & 3 || optlen > 250) goto out;
