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Select the appropriate source address (#1729)

Browse Source 
* selecting source

* adjust code style

* save matched result

* refine the algorythm to select source address

* fix unuseful line
This commit is contained in:
Buke Po
2017-05-05 11:14:26 -07:00
committed by Jonathan Hui
parent da7ba8ba19
commit 7e50d1a668
1 changed files with 25 additions and 12 deletions
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src/core/net/ip6.cpp
+25 -12
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@@ -957,22 +957,29 @@ const NetifUnicastAddress *Ip6::SelectSourceAddress(MessageInfo &aMessageInfo)
const Address *candidateAddr;
int8_t candidateId;
int8_t rvalIface = 0;
uint8_t rvalPrefixMatched = 0;
uint8_t destinationScope = destination->GetScope();
for (Netif *netif = GetNetifList(); netif; netif = netif->mNext)
{
candidateId = netif->GetInterfaceId();
if (destination->IsLinkLocal() || destination->IsMulticast())
{
if (interfaceId != candidateId)
{
continue;
}
}
for (const NetifUnicastAddress *addr = netif->mUnicastAddresses; addr; addr = addr->GetNext())
{
candidateAddr = &addr->GetAddress();
uint8_t overrideScope;
uint8_t candidatePrefixMatched;
if (destination->IsLinkLocal() || destination->IsMulticast())
{
if (interfaceId != candidateId)
{
continue;
}
}
candidateAddr = &addr->GetAddress();
candidatePrefixMatched = destination->PrefixMatch(*candidateAddr);
overrideScope = (candidatePrefixMatched >= addr->mPrefixLength) ? addr->GetScope() : destinationScope;
if (candidateAddr->IsAnycastRoutingLocator())
{
@@ -985,29 +992,32 @@ const NetifUnicastAddress *Ip6::SelectSourceAddress(MessageInfo &aMessageInfo)
// Rule 0: Prefer any address
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
else if (*candidateAddr == *destination)
{
// Rule 1: Prefer same address
rvalAddr = addr;
rvalIface = candidateId;
goto exit;
ExitNow();
}
else if (addr->GetScope() < rvalAddr->GetScope())
{
// Rule 2: Prefer appropriate scope
if (addr->GetScope() >= destination->GetScope())
if (addr->GetScope() >= overrideScope)
{
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
}
else if (addr->GetScope() > rvalAddr->GetScope())
{
if (rvalAddr->GetScope() < destination->GetScope())
if (rvalAddr->GetScope() < overrideScope)
{
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
}
else if (addr->mPreferred && !rvalAddr->mPreferred)
@@ -1015,6 +1025,7 @@ const NetifUnicastAddress *Ip6::SelectSourceAddress(MessageInfo &aMessageInfo)
// Rule 3: Avoid deprecated addresses
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
else if (aMessageInfo.mInterfaceId != 0 && aMessageInfo.mInterfaceId == candidateId &&
rvalIface != candidateId)
@@ -1023,14 +1034,16 @@ const NetifUnicastAddress *Ip6::SelectSourceAddress(MessageInfo &aMessageInfo)
// Rule 5: Prefer outgoing interface
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
else if (destination->PrefixMatch(*candidateAddr) > destination->PrefixMatch(rvalAddr->GetAddress()))
else if (candidatePrefixMatched > rvalPrefixMatched)
{
// Rule 6: Prefer matching label
// Rule 7: Prefer public address
// Rule 8: Use longest prefix matching
rvalAddr = addr;
rvalIface = candidateId;
rvalPrefixMatched = candidatePrefixMatched;
}
}
}