Le samedi 14 juillet 2007, Daniel Schaffrath a écrit : > 'man 7 ip' sais that IP_RECVOPTS is not supported for SOCK_STREAM > sockets. > > But what if for debugging/measuring purposes I wanted to record the > route of the datagrams containing the stream segments? Are there any > other ways to get the IP options? Like a second raw socket to deliver > cmsgs to user space and later resubmit for kernel TCP processing and > normal delivery to application -- if that is possible at all.
The STREAM does not return data on a per-packet basis, so it would be total non-sense to have IP_RECVOPTS on STREAM sockets. What would the kernel do when there is re-assembly before delivery to userland, or if a retransmitted segment has different options?! FYI, the "advanced" socket API (for IPv6) consistently notes that sending/receiving IP(v6) options per-packet is only defined for DGRAM and RAW sockets. You have to raw sockets, or better yet, BPF to do this. -- Rémi Denis-Courmont http://www.remlab.net/ - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
