devip: pick less surprising interface address in header for incoming UDP packets
We used to just return the first address of the incoming interface regardless of if the address matches the source ip type and scope. This change tries to find the best interface address that will match the source ip so it can be used as a source address when replying to the packet.front
parent
1a5dafcc3d
commit
e46000f076
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@ -552,7 +552,9 @@ rudpiput(Proto *rudp, Ipifc *ifc, Block *bp)
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p = bp->rp;
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ipmove(p, raddr); p += IPaddrlen;
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ipmove(p, laddr); p += IPaddrlen;
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ipmove(p, ifc->lifc->local); p += IPaddrlen;
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if(!ipv6local(ifc, p, 0, raddr))
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ipmove(p, ifc->lifc != nil ? ifc->lifc->local : IPnoaddr);
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p += IPaddrlen;
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hnputs(p, rport); p += 2;
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hnputs(p, lport);
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break;
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@ -471,7 +471,9 @@ udpiput(Proto *udp, Ipifc *ifc, Block *bp)
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p = bp->rp;
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ipmove(p, raddr); p += IPaddrlen;
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ipmove(p, laddr); p += IPaddrlen;
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ipmove(p, ifc->lifc->local); p += IPaddrlen;
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if(!ipv6local(ifc, p, 0, raddr))
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ipmove(p, ifc->lifc != nil ? ifc->lifc->local : IPnoaddr);
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p += IPaddrlen;
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hnputs(p, rport); p += 2;
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hnputs(p, lport);
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break;
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