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PPP, CCP, MPPE: added packet plumbing in ppp.c to process MPPE packets

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This commit is contained in:
Sylvain Rochet 2015-04-19 15:52:46 +02:00
parent 51566d43bd
commit b27966860e
1 changed files with 76 additions and 0 deletions
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76
src/netif/ppp/ppp.c
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@ -115,6 +115,9 @@
#if CCP_SUPPORT
#include "netif/ppp/ccp.h"
#endif /* CCP_SUPPORT */
#if MPPE_SUPPORT
#include "netif/ppp/mppe.h"
#endif /* MPPE_SUPPORT */
#if ECP_SUPPORT
#include "netif/ppp/ecp.h"
#endif /* EAP_SUPPORT */
@ -434,6 +437,9 @@ static err_t ppp_netif_init_cb(struct netif *netif) {
static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip4_addr_t *ipaddr) {
#if PPP_IPV4_SUPPORT
ppp_pcb *pcb = (ppp_pcb*)netif->state;
#if CCP_SUPPORT && MPPE_SUPPORT
err_t err;
#endif /* CCP_SUPPORT && MPPE_SUPPORT */
LWIP_UNUSED_ARG(ipaddr);
/* Check that the link is up. */
@ -445,6 +451,39 @@ static err_t ppp_netif_output_ip4(struct netif *netif, struct pbuf *pb, const ip
return ERR_RTE;
}
#if CCP_SUPPORT
#if MPPE_SUPPORT
/* If MPPE is required, refuse any IP packet until we are able to crypt them.
*/
if (pcb->settings.require_mppe &&
(!pcb->ccp_is_up || pcb->ccp_transmit_method != CI_MPPE) ) {
PPPDEBUG(LOG_ERR, ("ppp_netif_output_ip4[%d]: MPPE required, not up\n", pcb->netif->num));
LINK_STATS_INC(link.rterr);
LINK_STATS_INC(link.drop);
snmp_inc_ifoutdiscards(netif);
return ERR_RTE;
}
#endif /* MPPE_SUPPORT */
switch (pcb->ccp_transmit_method) {
#if MPPE_SUPPORT
case CI_MPPE:
if ((err = mppe_compress(pcb, &pcb->mppe_comp, &pb, PPP_IP)) != ERR_OK) {
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
snmp_inc_ifoutdiscards(netif);
return err;
}
err = pcb->link_cb->netif_output(pcb, pcb->link_ctx_cb, pb, PPP_COMP);
pbuf_free(pb);
return err;
#endif /* MPPE_SUPPORT */
default:
break;
}
#endif /* CCP_SUPPORT */
return pcb->link_cb->netif_output(pcb, pcb->link_ctx_cb, pb, PPP_IP);
#else /* PPP_IPV4_SUPPORT */
LWIP_UNUSED_ARG(netif);
@ -688,6 +727,43 @@ void ppp_input(ppp_pcb *pcb, struct pbuf *pb) {
goto drop;
}
#if CCP_SUPPORT
if (protocol == PPP_COMP) {
u8_t *pl;
if (!pcb->ccp_is_up) {
goto drop;
}
switch (pcb->ccp_receive_method) {
#if MPPE_SUPPORT
case CI_MPPE:
if (mppe_decompress(pcb, &pcb->mppe_decomp, &pb) != ERR_OK) {
goto drop;
}
break;
#endif /* MPPE_SUPPORT */
default:
break;
}
/* Assume no PFC */
if (pb->len < 2) {
goto drop;
}
/* Extract and hide protocol (do PFC decompression if necessary) */
pl = (u8_t*)pb->payload;
if (pl[0] & 0x01) {
protocol = pl[0];
pbuf_header(pb, -1);
} else {
protocol = (pl[0] << 8) | pl[1];
pbuf_header(pb, -2);
}
}
#endif /* CCP_SUPPORT */
switch(protocol) {
#if PPP_IPV4_SUPPORT