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Move setting lower protocol id field value from UDP & TCP
protocols to IPv4 only, so lower layer will know exactly value
to set in protocol id field.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Add set_next_proto callback to proto_hdr struct to allow lower
protocol set next protocol id by enum proto_id.
Extended proto_lower_default_add(...) function to take upper protocol
to delegate it's id to lower protocol to set next protocol field.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Change proto_header_init(...) and proto_lower_default_add(...)
functions to return struct proto_hdr * to do not call
proto_current_header(...) after, so it makes more sense to get struct
proto_hdr * right after initializing protocol by id.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Add a function 'tcp()' to generate TCP headers from the trafgen
configuration language.
Fields supported:
sp|sport TCP source port (default 0)
dp|dport TCP destination port (default 0)
seq Sequence number (default: 0)
aseq|ackseq Acknowledgement number (default 0)
doff|hlen Header length/data offset (default: 5)
cwr Congestion Window Reduced flag (default: 0)
ece|ecn ECN-Echo flag (default: 0)
urg Urgent flag (default: 0)
ack Acknowledgement flag (default: 0)
psh Push flag (default: 0)
rst Reset flag (default: 0)
syn Synchronize flag (default: 0)
fin Finish flag (default: 0)
win|window Receive window size (default: 0)
csum Checksum field (calculated automatically)
urgptr Urgent pointer (default: 0)
Example (SYN on port 80/http):
{ tcp(dport=80, syn, window=5840) }
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Add trafgen_l4.c module with generation UDP header fields.
UDP protocol generation logic automaticaly sets the protocol field of
the lower level protocol to IPPROTO_UDP by default (if it is IPv4).
Also checksum & length are calculated and set if it is not given by the
user.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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