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miniupnpd/pcpserver.c: add comments

This commit is contained in:
Thomas Bernard 2014-03-24 10:24:41 +01:00
parent 7137665101
commit ba1875b52c
1 changed files with 30 additions and 1 deletions
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29
miniupnpd/pcpserver.c
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@ -821,6 +821,34 @@ static void DeletePCPPeer(pcp_info_t *pcp_msg_info)
}
#endif /* PCP_PEER */
/* internal external PCP remote peer actual remote peer
* -------- ------- --------------- ------------------
* IPv4 firewall IPv4 IPv4 IPv4 IPv4
* IPv6 firewall IPv6 IPv6 IPv6 IPv6
* NAT44 IPv4 IPv4 IPv4 IPv4
* NAT46 IPv4 IPv6 IPv4 IPv6
* NAT64 IPv6 IPv4 IPv6 IPv4
* NPTv6 IPv6 IPv6 IPv6 IPv6
*
* Address Families with MAP and PEER
*
* The 'internal' address is implicitly the same as the source IP
* address of the PCP request, except when the THIRD_PARTY option is
* used.
*
* The 'external' address is the Suggested External Address field of the
* MAP or PEER request, and its address family is usually the same as
* the 'internal' address family, except when technologies like NAT64
* are used.
*
* The 'remote peer' address is the remote peer IP address of the PEER
* request or the FILTER option of the MAP request, and is always the
* same address family as the 'internal' address, even when NAT64 is
* used. In NAT64, the IPv6 PCP client is not necessarily aware of the
* NAT64 or aware of the actual IPv4 address of the remote peer, so it
* expresses the IPv6 address from its perspective. */
/* TODO : support more scenarios than just NAT44 */
static void CreatePCPMap(pcp_info_t *pcp_msg_info)
{
char desc[64];
@ -993,6 +1021,7 @@ static int ValidatePCPMsg(pcp_info_t *pcp_msg_info)
return 0;
}
/* protocol zero means 'all protocols' : internal port MUST be zero */
if (pcp_msg_info->protocol == 0 && pcp_msg_info->int_port != 0) {
pcp_msg_info->result_code = PCP_ERR_MALFORMED_REQUEST;
return 0;