Documentation
Includes
netif/ppp/ppp_opts.h
#include "netif/ppp/ppp_opts.h"
netif/ppp/pppcrypt.h
#include "netif/ppp/pppcrypt.h"
Macros
Marco MPPE_H
#define MPPE_H
Marco MPPE_PAD
#define MPPE_PAD 4 /* MPPE growth per frame */
Marco MPPE_MAX_KEY_LEN
#define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */
Marco MPPE_OPT_40
#define MPPE_OPT_40 1 /* 40 bit */
Marco MPPE_OPT_128
#define MPPE_OPT_128 2 /* 128 bit */
Marco MPPE_OPT_STATEFUL
#define MPPE_OPT_STATEFUL 4 /* stateful mode */
Marco MPPE_OPT_56
#define MPPE_OPT_56 8 /* 56 bit */
Marco MPPE_OPT_MPPC
#define MPPE_OPT_MPPC 16 /* MPPC compression */
Marco MPPE_OPT_D
#define MPPE_OPT_D 32 /* Unknown */
Marco MPPE_OPT_UNSUPPORTED
#define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D)
Marco MPPE_OPT_UNKNOWN
#define MPPE_OPT_UNKNOWN 64 /* Bits !defined in RFC 3078 were set */
Marco MPPE_C_BIT
#define MPPE_C_BIT 1 /* MPPC */
Marco MPPE_D_BIT
#define MPPE_D_BIT 16 /* Obsolete, usage unknown */
Marco MPPE_L_BIT
#define MPPE_L_BIT 32 /* 40-bit */
Marco MPPE_S_BIT
#define MPPE_S_BIT 64 /* 128-bit */
Marco MPPE_M_BIT
#define MPPE_M_BIT 128 /* 56-bit, not supported */
Marco MPPE_H_BIT
#define MPPE_H_BIT 1 /* Stateless (in a different byte) */
Marco MPPE_ALL_BITS
#define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT)
Marco MPPE_OPTS_TO_CI(opts, ci)
#define MPPE_OPTS_TO_CI(opts, ci) \
do { \
u_char *ptr = ci; /* u_char[4] */ \
\
/* H bit */ \
if (opts & MPPE_OPT_STATEFUL) \
*ptr++ = 0; \
else \
*ptr++ = MPPE_H_BIT; \
*ptr++ = 0; \
*ptr++ = 0; \
\
/* S,L bits */ \
*ptr = 0; \
if (opts & MPPE_OPT_128) \
*ptr |= MPPE_S_BIT; \
if (opts & MPPE_OPT_40) \
*ptr |= MPPE_L_BIT; \
/* M,D,C bits not supported */ \
} while (/* CONSTCOND */ 0)
Marco MPPE_CI_TO_OPTS(ci, opts)
#define MPPE_CI_TO_OPTS(ci, opts) \
do { \
const u_char *ptr = ci; /* u_char[4] */ \
\
opts = 0; \
\
/* H bit */ \
if (!(ptr[0] & MPPE_H_BIT)) \
opts |= MPPE_OPT_STATEFUL; \
\
/* S,L bits */ \
if (ptr[3] & MPPE_S_BIT) \
opts |= MPPE_OPT_128; \
if (ptr[3] & MPPE_L_BIT) \
opts |= MPPE_OPT_40; \
\
/* M,D,C bits */ \
if (ptr[3] & MPPE_M_BIT) \
opts |= MPPE_OPT_56; \
if (ptr[3] & MPPE_D_BIT) \
opts |= MPPE_OPT_D; \
if (ptr[3] & MPPE_C_BIT) \
opts |= MPPE_OPT_MPPC; \
\
/* Other bits */ \
if (ptr[0] & ~MPPE_H_BIT) \
opts |= MPPE_OPT_UNKNOWN; \
if (ptr[1] || ptr[2]) \
opts |= MPPE_OPT_UNKNOWN; \
if (ptr[3] & ~MPPE_ALL_BITS) \
opts |= MPPE_OPT_UNKNOWN; \
} while (/* CONSTCOND */ 0)
Marco SHA1_PAD_SIZE
#define SHA1_PAD_SIZE 40
Functions
Func mppe_set_key
void mppe_set_key(ppp_pcb *pcb, ppp_mppe_state *state, u8_t *key);
Func mppe_init
void mppe_init(ppp_pcb *pcb, ppp_mppe_state *state, u8_t options);
Func mppe_comp_reset
void mppe_comp_reset(ppp_pcb *pcb, ppp_mppe_state *state);
Func mppe_compress
err_t mppe_compress(ppp_pcb *pcb, ppp_mppe_state *state, struct pbuf **pb, u16_t protocol);
Func mppe_decomp_reset
void mppe_decomp_reset(ppp_pcb *pcb, ppp_mppe_state *state);
Func mppe_decompress
err_t mppe_decompress(ppp_pcb *pcb, ppp_mppe_state *state, struct pbuf **pb);
Vars
Consts
Types
Typedefs
Typedef ppp_mppe_state;
typedef struct ppp_mppe_state {
lwip_arc4_context arc4;
u8_t master_key[MPPE_MAX_KEY_LEN];
u8_t session_key[MPPE_MAX_KEY_LEN];
u8_t keylen; /* key length in bytes */
/* NB: 128-bit == 16, 40-bit == 8!
* If we want to support 56-bit, the unit has to change to bits
*/
u8_t bits; /* MPPE control bits */
u16_t ccount; /* 12-bit coherency count (seqno) */
u16_t sanity_errors; /* take down LCP if too many */
unsigned int stateful :1; /* stateful mode flag */
unsigned int discard :1; /* stateful mode packet loss flag */
} ppp_mppe_state;