> We might have to clarify what happens if the application disables
> fragmentation, but sends a larger packet than the MTU of the outgoing
> interface. For example, just return an EMSGSIZE error, return an
> IPV6_PATHMTU ancillary data item (if the application sets
> IPV6_RECVPATHMTU beforehand), or both...
I'll add this.
> > struct ip6_mtuinfo {
> > struct sockaddr_in6 ip6m_addr; /* dst IPv6 address including scope
> > */
> > unsigned int ip6m_mtu; /* path MTU in host byte order */
>
> Is "unsigned int" appropriate here (I'm just wondering, not sure on
> this)?
What would you like to see instead?
uint32_t? uint16_t?
> This cmsghdr will be passed to every socket that sets the
> IPV6_RECVPATHMTU socket option, even if the socket is
> non-connected. Note that this also means an application that sets
> the option may get the ancillary data upon a too big message sent
> from other applications to the same destination. An implementation
> may skip to deliver the data to sockets that connect a different
> foreign address from the destination address of the corresponding
> ip6_mtuinfo strucutre.
I'll add the above. THanks for the text.
> This is based on the behavior of our implementation, but I don't stick
> to minor details (e.g. the last sentence).
>
> > XXX What about more complex paths e.g. when using a routing header?
>
> How about the following text?
>
> When an application sends packet with a routing header, the final
> destination stored in the ip6m_addr member does not necessarily
> contain complete information of the entire path. Thus, an
> implementation may append an additional data structure after
> ip6_mtuinfo to tell the application precise information of the
> entire path. This definition of the additinaol structure is beyond
> the scope of this document.
I can add this unless somebody has any concerns about essentially making
this implementation specific.
Erik
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