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The commit 78c13b71e196 ("trafgen: Allow to generate packets
to output pcap file") introduced a regression when output is
a network device and multiple CPU are in use: the packet
socket is created before fork() and thus the socket is shared
among all the processes: all of them except the first will
fail while setting the tx_ring.
Fix it splitting the io open() helper in a create() op,
called before forking, and the open() op called by each process.
Fixes: 78c13b71e196 ("trafgen: Allow to generate packets to output pcap file")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Added trafgen_dump.c module which dumps headers from packet
in .cfg format. Packet is dumped if -o <file>.cfg was specified,
it might be useful to specify *.pcap file as input and convert it
into .cfg file to edit proto fields in human readable format.
To make it possible several main changes were added:
1) packet id is embedded into struct packet.id, and
it is updated on each realloc_packet()
2) Added new struct proto_hdr.get_next_proto callback
to make possible apply fields of next header.
3) Added new dev_io ops for writting packets into .cfg file,
to re-use common dev_io mechsnism for packets dumping.
Before dump the default ETH_PROTO fields are applied as first header and
then next proto_hdr is identified via .get_next_proto(...) callback.
Meanwhile only eth, arp, vlan, ip4, udp, & tcp protos can be dissected
into *.cfg format.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Refactor dev_io_ops read & write to specify struct packet *,
it may simplify a bit a caller logic. And it allow to keep
required members within one struct packet object.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Simplify a bit of creation rfraw device by delegating it to the dev_io
API, also in case the output device is pcap file the --rfraw option
sets the link type to ieee80211 radio tap.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Add trafgen_dev.c module which provides generic way of
reading and writing packets to/from networking device or a pcap file.
Also allow to handle output pcap file via '-o, --out, --dev' option.
It might be useful in future for testing some link protocols which is
not easy to capture (e.g. wlan packets) w/o having some special setup.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
[tklauser: fix whitespace issues]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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