• Nicolas Dichtel's avatar
    vti[6]: fix packet tx through bpf_redirect() · 95224166
    Nicolas Dichtel authored
    With an ebpf program that redirects packets through a vti[6] interface,
    the packets are dropped because no dst is attached.
    
    This could also be reproduced with an AF_PACKET socket, with the following
    python script (vti1 is an ip_vti interface):
    
     import socket
     send_s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, 0)
     # scapy
     # p = IP(src='10.100.0.2', dst='10.200.0.1')/ICMP(type='echo-request')
     # raw(p)
     req = b'E\x00\x00\x1c\x00\x01\x00\x00@\x01e\xb2\nd\x00\x02\n\xc8\x00\x01\x08\x00\xf7\xff\x00\x00\x00\x00'
     send_s.sendto(req, ('vti1', 0x800, 0, 0))
    Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
    Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
    95224166
ip6_vti.c 29.3 KB