Hi
First, apologies to Andi Kleen for sending this question directly to him
instead of to the mailing list.
I have tried to receive ISO protocol pkts (Prot Type 0xfefe) on a raw
socket, but I am only able to receive them if I create the socket as
follows:
fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
with ETH_P_ALL as the 3rd argument.
If I do
fd = socket(PF_PACKET, SOCK_RAW, htons(0xfefe));
I do not receive the pkts to the application
The other relevant code is:
setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr))
with mr.mr_type = PACKET_MR_MULTICAST; which allows me to pick up the
multicast MAC of the pkts being received .
If for example I use ETH_P_ARP or ETH_P_IP in the socket create (instead of
ETH_P_ALL), then I receive only the relevant protocol types, but if I use a
value not defined in if_ether.h, I don't get the pkts - so basically it is
all or nothing wrt my protocol type.
Any ideas why?
TIA
Talmon
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