Andi Kleen wrote:
> First you pass the wrong address to PF_PACKET sendto() -- it gets a
> sockaddr_ll, not a old style spkt address.
> It is not clear from your snippet where fromlen comes from, but it is
> probably not correctly initialized (it should be sizeof(struct sockaddr_ll)
> Also sendto really gets a ``to'' not a ``from'', maybe you should fix
> the confusing naming.
I looked at af_packet.c and figured out that sockaddr_ll was what was needed
(thanks for the well commented code :))
Also, it looks like after I bind, I can pass NULL in to sendto for
the 'to' address.
Right now, it looks like the code is putting it on the right interface
(according to debug I put in the kernel), but I'm still not seeing it on
the wire... I'll keep digging down...
One thing that bothers me a little bit. I have 2 4-port NICs and a
single... The single is the one I'm trying to send messages over.
No matter which slot I put it in (there are only 3 PCI slots in the MB),
that interface shows up as eth8. Is that normal? I thought they probed
based on PCI slots, so that changing the slot would change the ifname it
showed up on...
One final question.. If I create the socket like:
int s = socket(PF_PACKET, SOCK_RAW, htons(ether_type));
bind like this:
struct sockaddr_ll myaddr;
memset(&myaddr, '\0', sizeof(myaddr));
myaddr.sll_family = AF_PACKET;
myaddr.sll_protocol = htons(ether_type);
myaddr.sll_ifindex = dev_idx;
r = bind(s, (struct sockaddr*)(&myaddr), sizeof(myaddr));
and send like this:
r = sendto(dev_socket, msg, msg_len, 0, NULL, 0);
Should I expect to see this method in af_packet.cc called?
static int packet_sendmsg(struct socket *sock, struct msghdr *msg, int len,
struct scm_cookie *scm)
I was expecting to see packet_sendmsg_spkt, but it is using the one above...
Thanks,
Ben
--
Ben Greear ([EMAIL PROTECTED]) http://www.candelatech.com
Author of ScryMUD: scry.wanfear.com 4444 (Released under GPL)
http://scry.wanfear.com http://scry.wanfear.com/~greear
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