From b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Mon Sep 17 00:00:00 2001 From: Matt Domsch Date: Tue, 8 Nov 2005 09:40:47 -0800 Subject: [PPP]: add PPP MPPE encryption module From: Matt Domsch The patch below implements the Microsoft Point-to-Point Encryption method as a PPP compressor/decompressor. This is necessary for Linux clients and servers to interoperate with Microsoft Point-to-Point Tunneling Protocol (PPTP) servers (either Microsoft PPTP servers or the poptop project) which use MPPE to encrypt data when creating a VPN. This patch differs from the kernel_ppp_mppe DKMS pacakge at pptpclient.sourceforge.net by utilizing the kernel crypto routines rather than providing its own SHA1 and arcfour implementations. Minor changes to ppp_generic.c try to prevent a link from disabling compression (in our case, the encryption) after it has started using compression (encryption). Feedback to please. Signed-off-by: Matt Domsch Cc: James Cameron Cc: "David S. Miller" Signed-off-by: Brice Goglin Acked-by: Paul Mackerras Signed-off-by: Andrew Morton Signed-off-by: David S. Miller --- include/linux/ppp-comp.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/linux/ppp-comp.h') diff --git a/include/linux/ppp-comp.h b/include/linux/ppp-comp.h index 7227e653b3be..e86a7a5cf355 100644 --- a/include/linux/ppp-comp.h +++ b/include/linux/ppp-comp.h @@ -111,6 +111,8 @@ struct compressor { /* Used in locking compressor modules */ struct module *owner; + /* Extra skb space needed by the compressor algorithm */ + unsigned int comp_extra; }; /* @@ -190,6 +192,13 @@ struct compressor { #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL) #define DEFLATE_CHK_SEQUENCE 0 +/* + * Definitions for MPPE. + */ + +#define CI_MPPE 18 /* config option for MPPE */ +#define CILEN_MPPE 6 /* length of config option */ + /* * Definitions for other, as yet unsupported, compression methods. */ -- cgit v1.2.3-70-g09d2