- Do not modify Peer's Call ID in outgoing Incoming-Call-Connected
PPTP control messages. - Cosmetics: replace `GRE link' with `PPTP link'. Reviewed by: Erik Salander <erik@whistle.com>
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@ -45,8 +45,8 @@
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"de-aliasing" of incoming packets, this is different than any other
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TCP applications that are currently (ie. FTP, IRC and RTSP) aliased.
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For Call IDs encountered for the first time, a GRE alias link is created.
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The GRE alias link uses the Call ID in place of the original port number.
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For Call IDs encountered for the first time, a PPTP alias link is created.
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The PPTP alias link uses the Call ID in place of the original port number.
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An alias Call ID is created.
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For this routine to work, the PPTP control messages must fit entirely
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@ -114,7 +114,7 @@ enum {
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PPTP_StopCtrlConnRequest = 3,
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PPTP_StopCtrlConnReply = 4,
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PPTP_EchoRequest = 5,
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PPTP_statoReply = 6,
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PPTP_EchoReply = 6,
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PPTP_OutCallRequest = 7,
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PPTP_OutCallReply = 8,
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PPTP_InCallRequest = 9,
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@ -172,7 +172,7 @@ void
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AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *link) /* The PPTP control link */
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{
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struct alias_link *gre_link;
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struct alias_link *pptp_link;
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PptpCallId cptr;
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u_int16_t ctl_type; /* control message type */
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struct tcphdr *tc;
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@ -182,24 +182,32 @@ AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
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return;
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/* Modify certain PPTP messages */
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if ((ctl_type >= PPTP_OutCallRequest) &&
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(ctl_type <= PPTP_CallDiscNotify)) {
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switch (ctl_type) {
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case PPTP_OutCallRequest:
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case PPTP_OutCallReply:
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case PPTP_InCallRequest:
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case PPTP_InCallReply:
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case PPTP_CallClearRequest:
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case PPTP_CallDiscNotify:
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/* Establish GRE link for address and Call ID found in PPTP Control Msg */
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gre_link = FindPptpOut(GetOriginalAddress(link), GetDestAddress(link),
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cptr->cid1);
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/* Establish PPTP link for address and Call ID found in PPTP Control Msg */
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pptp_link = FindPptpOut(GetOriginalAddress(link), GetDestAddress(link),
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cptr->cid1);
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if (gre_link != NULL) {
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if (pptp_link != NULL) {
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int accumulate = cptr->cid1;
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/* alias the Call Id */
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cptr->cid1 = GetAliasPort(gre_link);
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cptr->cid1 = GetAliasPort(pptp_link);
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/* Compute TCP checksum for revised packet */
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tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
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accumulate -= cptr->cid1;
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ADJUST_CHECKSUM(accumulate, tc->th_sum);
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}
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break;
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default:
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return;
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}
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}
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@ -207,7 +215,7 @@ void
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AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *link) /* The PPTP control link */
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{
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struct alias_link *gre_link;
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struct alias_link *pptp_link;
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PptpCallId cptr;
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u_int16_t *pcall_id;
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u_int16_t ctl_type; /* control message type */
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@ -231,18 +239,17 @@ AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
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break;
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default:
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return;
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break;
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}
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/* Find GRE link for address and Call ID found in PPTP Control Msg */
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gre_link = FindPptpIn(GetDestAddress(link), GetAliasAddress(link),
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*pcall_id);
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/* Find PPTP link for address and Call ID found in PPTP Control Msg */
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pptp_link = FindPptpIn(GetDestAddress(link), GetAliasAddress(link),
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*pcall_id);
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if (gre_link != NULL) {
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if (pptp_link != NULL) {
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int accumulate = *pcall_id;
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/* alias the Call Id */
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*pcall_id = GetOriginalPort(gre_link);
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*pcall_id = GetOriginalPort(pptp_link);
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/* Compute TCP checksum for modified packet */
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tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
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@ -45,8 +45,8 @@
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"de-aliasing" of incoming packets, this is different than any other
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TCP applications that are currently (ie. FTP, IRC and RTSP) aliased.
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For Call IDs encountered for the first time, a GRE alias link is created.
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The GRE alias link uses the Call ID in place of the original port number.
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For Call IDs encountered for the first time, a PPTP alias link is created.
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The PPTP alias link uses the Call ID in place of the original port number.
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An alias Call ID is created.
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For this routine to work, the PPTP control messages must fit entirely
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@ -114,7 +114,7 @@ enum {
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PPTP_StopCtrlConnRequest = 3,
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PPTP_StopCtrlConnReply = 4,
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PPTP_EchoRequest = 5,
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PPTP_statoReply = 6,
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PPTP_EchoReply = 6,
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PPTP_OutCallRequest = 7,
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PPTP_OutCallReply = 8,
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PPTP_InCallRequest = 9,
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@ -172,7 +172,7 @@ void
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AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *link) /* The PPTP control link */
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{
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struct alias_link *gre_link;
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struct alias_link *pptp_link;
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PptpCallId cptr;
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u_int16_t ctl_type; /* control message type */
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struct tcphdr *tc;
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@ -182,24 +182,32 @@ AliasHandlePptpOut(struct ip *pip, /* IP packet to examine/patch */
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return;
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/* Modify certain PPTP messages */
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if ((ctl_type >= PPTP_OutCallRequest) &&
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(ctl_type <= PPTP_CallDiscNotify)) {
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switch (ctl_type) {
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case PPTP_OutCallRequest:
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case PPTP_OutCallReply:
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case PPTP_InCallRequest:
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case PPTP_InCallReply:
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case PPTP_CallClearRequest:
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case PPTP_CallDiscNotify:
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/* Establish GRE link for address and Call ID found in PPTP Control Msg */
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gre_link = FindPptpOut(GetOriginalAddress(link), GetDestAddress(link),
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cptr->cid1);
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/* Establish PPTP link for address and Call ID found in PPTP Control Msg */
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pptp_link = FindPptpOut(GetOriginalAddress(link), GetDestAddress(link),
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cptr->cid1);
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if (gre_link != NULL) {
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if (pptp_link != NULL) {
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int accumulate = cptr->cid1;
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/* alias the Call Id */
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cptr->cid1 = GetAliasPort(gre_link);
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cptr->cid1 = GetAliasPort(pptp_link);
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/* Compute TCP checksum for revised packet */
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tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
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accumulate -= cptr->cid1;
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ADJUST_CHECKSUM(accumulate, tc->th_sum);
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}
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break;
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default:
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return;
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}
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}
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@ -207,7 +215,7 @@ void
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AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
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struct alias_link *link) /* The PPTP control link */
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{
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struct alias_link *gre_link;
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struct alias_link *pptp_link;
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PptpCallId cptr;
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u_int16_t *pcall_id;
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u_int16_t ctl_type; /* control message type */
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@ -231,18 +239,17 @@ AliasHandlePptpIn(struct ip *pip, /* IP packet to examine/patch */
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break;
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default:
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return;
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break;
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}
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/* Find GRE link for address and Call ID found in PPTP Control Msg */
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gre_link = FindPptpIn(GetDestAddress(link), GetAliasAddress(link),
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*pcall_id);
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/* Find PPTP link for address and Call ID found in PPTP Control Msg */
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pptp_link = FindPptpIn(GetDestAddress(link), GetAliasAddress(link),
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*pcall_id);
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if (gre_link != NULL) {
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if (pptp_link != NULL) {
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int accumulate = *pcall_id;
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/* alias the Call Id */
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*pcall_id = GetOriginalPort(gre_link);
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*pcall_id = GetOriginalPort(pptp_link);
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/* Compute TCP checksum for modified packet */
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tc = (struct tcphdr *) ((char *) pip + (pip->ip_hl << 2));
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