Hi, I discovered that the current description of the IPV6_ROUTER_ALERT sockopt in ipv6.7 is significantly wrong. A patch to fix the description is below. I sent a version of this earlier in the year to [EMAIL PROTECTED], but nothing happened with it at the time.
The correction is based on reading the relevant parts of the kernel source code, and backed up by some test programs. The main bits of code in the kernel (in case someone wants to double-check my update) are net/ipv6/ipv6_sockglue.c:ip6_ra_control() and net/ipv6/ip6_output.c:ip6_call_ra_chain(). The patch is against man-pages-2.66. regards, Andrew --- man7/ipv6.7.orig 2007-10-14 11:59:46.000000000 +0100 +++ man7/ipv6.7 2007-10-14 12:05:15.000000000 +0100 @@ -233,10 +233,17 @@ Argument is a pointer to boolean. .TP .B IPV6_ROUTER_ALERT -Pass all forwarded packets containing an router alert option to +Pass forwarded packets containing a router alert hop-by-hop option to this socket. -Only allowed for datagram sockets and for root. -Argument is a pointer to boolean. +Only allowed for SOCK_RAW sockets. +The tapped packets are not forwarded by the kernel, it is the +user's responsibility to send them out again. +Argument is a pointer to an integer. +A positive integer indicates a router alert option value to intercept. +Packets carrying a router alert option with a value field containing +this integer will be delivered to the socket. +A negative integer disables delivery of packets with router alert options +to this socket. .TP .B IPV6_UNICAST_HOPS Set the unicast hop limit for the socket. - 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
