Il 23/03/2015 15:33, Daniel Borkmann ha scritto:
On 03/23/2015 03:24 PM, Lorenzo Pistone wrote:I don't get the same message (obviously) with not -n but -t, however still no packet gets out.Well, with -t you'll be using sendto(), so that's expected. So let me ask a stupid question, assuming you don't use -n and therefore not hit this rounding bug, and you still cannot send a packet out ... is your link from the device actually up (ip link)? Are you perhaps checking with tcpdump if a packet has been sent out?Il 23/03/2015 15:23, Lorenzo Pistone ha scritto:So I tried now without -n, still absolutely no packet out on real devices (contrary to lo), but when interrupting I get "Cannot destroy the TX_RING: Device or resource busy!" for each CPU (so 4 times in my case). Looks like a start.Il 23/03/2015 10:27, Daniel Borkmann ha scritto:Hi Lorenzo, On 03/22/2015 03:13 PM, Lorenzo Pistone wrote:> I've tried with iwlwifi and virtio. mausezahn on the contrary works. I checked with strace and there does not seem to be anyHi,I'm trying to send UDP packets with zero length withthis simple configuration on trafgen:{ # --- ethernet header --- 0xbe, 0x15, 0x1d, 0x12, 0x1c, 0x57, # mac destination 0xfa, 0x16, 0x3e, 0xa0, 0x5d, 0x18, # mac source const16(0x0800), # protocol # --- ip header --- # ipv4 version (4-bit) + ihl (4-bit), tos 0b01000101, 0, # ipv4 total len const16(28), # id (note: runtime dynamic random) drnd(2), # ipv4 3-bit flags + 13-bit fragment offset # 001 = more fragments 0b01000000, 0, 64, # ttl 17, # proto udp # dynamic ip checksum (note: offsets are zero indexed) csumip(14, 33), 92, 222, 69, 15, # source ip 85, 214, 106, 103, # dest ip # --- udp header ---# as this is a fragment the below stuff does not matter too muchconst16(48054), # src port const16(28785), # dst port const16(8), # udp length# udp checksum can be dyn calc via csumudp(offset ip, offset tcp)# which is csumudp(14, 34), but for udp its allowed to be zero csumudp(14, 34), }I can send these packets on lo, but trafgen fails to send anything on real devices. I used both the TX_RING and sendto method.> call that returns an error. Thanks for the bug report. Can you provide some more debug information?How do you invoke trafgen? strace -f? Something suspicious in dmesg? ip link?Cheers, Daniel
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