From: 'Marcelo Ricardo Leitner' > Sent: 08 September 2017 16:11 > On Fri, Sep 08, 2017 at 03:01:22PM +0000, David Laight wrote: > > From: Marcelo Ricardo Leitner > > > Sent: 08 September 2017 15:50 > > > On Fri, Sep 08, 2017 at 09:03:31AM +0000, David Laight wrote: > > > > Can anyone think how to create multiple outgoing connections > > > > from the same subset of local IP addresses and the same port? > > > > > > > > We bind() to the first IP address and port, then use > > > > SCTP_SOCKOPT_BINDX_ADD to add the second IP address. > > > > But even with IP_REUASADDR set you can't repeat that on > > > > a second socket. > > > > > > When did you set IP_REUSEADDR? Checking the code, seems you have to set > > > it before any binding, because then the port entry will be created and > > > such flag will be initialized with that state. > > > > Indeed, otherwise it has no effect. > > > > For both sockets, right? I'll debug this if yes. > > > The point is that (IIRC) IP_REUSEADDR only lets you bind the same > > port number to 2 sockets - the IP addresses have to be different. > > I'm not seeing where this could be happening. I see this: > if (pp->fastreuse && sk->sk_reuse && > sk->sk_state != SCTP_SS_LISTENING) > goto success; > Meaning that if the port allows reusing and so does the new socket, and > it's not in listening state, it would be allowed. I wonder if the behaviour has changed since I last tested it. (Nothing obvious since 2008) David -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
