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2017-06-02trafgen: proto: Allow to set field with variable lengthVadim Kochan1-3/+3
It is quite tricky to set field value with a variable length (i.e. DNS query name), to make it possible the field needs to be added to header with 'len=0' in that case there will be no any payload allocation, but only while setting the field value the packet will be appended with a real length bytes and after the field needs to be relocated to the right place. Also add 'len' parameter to *_set_bytes(...) functoins to have better control over it. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-12-21trafgen: proto: Rename proto_field_xxx -> proto_hdr_field_xxxVadim Kochan1-22/+22
Rename all proto_field_xxx(...) functions to proto_hdr_field(...). It is good for 2 reasons: 1) proto_hdr_field_xxx naming is more consistent as it is related to proto_hdr API. 2) It makes possible to introduce proto_field_xxx API which will operate only with struct proto_field. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-10-04trafgen: l2: Add support for PFC headerVadim Kochan1-0/+42
Add PFC header fields setting (prio vector, time per priority). By default Ethernet header is pushed with required fields. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-10-04trafgen: l2: Add support for IEEE 802.3X PAUSE headerVadim Kochan1-0/+27
Add EEE802.3X Ethernet MAC Control PAUSE frame proto header with two fields - opcode & time. By default Ethernet header is pushed on header init. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-09-15trafgen: proto: Initialize lower proto header pointer on declarationTobias Klauser1-6/+2
Assign the pointer to the lower layer header on declaration instead of a separate line. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-08-12trafgen: proto: Split static protocol definition out of struct proto_hdrTobias Klauser1-12/+12
Currently struct proto_hdr is used twofold: 1) Statically define protocol behavior, i.e. all the *_hdr definitions in trafgen_l{2,3,4}.c which map a protocol id/layer to a set of callback functions. 2) For each packet created at parse time the struct is memcpy()'ed (including all the static information from 1) and then used to store dynamic information at parse/run time. Thus, struct proto_hdr members such as the proto id, layer and the pointers callback functions get copied for each created packet (in addition to the other fields which get changed during parsing). Also, static/dynamic information get mixed and we e.g. can't make the protocol definitions const to ensure they'll not get changed by mistake. Rather than copying the struct proto_hdr for every packet, clearly separate the two purposes defined above by splitting struct proto_hdr into two structs: 1) struct proto_ops for the static (const) protocol behavior definition 2) struct proto_hdr (reduced) for dynamic information struct proto_hdr keeps a pointer to the corresponding proto_ops instance and uses it to execute the corresponding callbacks. Reference: https://groups.google.com/forum/#!msg/netsniff-ng/20RvwJdh50Y/eMkbmKSaBgAJ Acked-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-08-10trafgen: proto: Add space between switch statement and opening parenthesisTobias Klauser1-1/+1
Follow common coding style and use: switch (...) instead of: switch(...) Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-08-09trafgen: proto: Make bytes pointer const in proto field set functionsTobias Klauser1-1/+1
Make the __proto_field_set_bytes() take a const uint8_t *bytes pointer and also changed all callers accordingly. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-04-22trafgen: proto: Replace panic() with bug() where applicableTobias Klauser1-1/+1
In some cases we use panic() in situations where the error could only happen due to an implementation error. Use bug() there as it is more applicable, as panic() is mainly used to report system call errors. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-02-23trafgen: l2: Add MPLS header generationVadim Kochan1-0/+32
Add support for MPLS header creating with fields: Label, TClass, Bottom-Stack, TTL By default S-field is set to 1 (last label), but resets to 0 if lower MPLS header is added. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-02-02trafgen: l2: Add VLAN header generationVadim Kochan1-10/+53
Add generation of VLAN header with supported fields: TPID, DEI/CFI, PCP, VID Changed struct proto_field.offset uint16_t -> int16_t to make TPID offset -2 to point to ether type. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-02-02trafgen: eth: Add setting next protocol idVadim Kochan1-1/+23
Move setting next protocol id field from higher protocols (ARP, IPv4) to Ethernet. It makes code little more generic w/o checking each lower protocol and setting specific field id. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-02-02trafgen: proto: Add set_next_proto callback to struct proto_hdrVadim Kochan1-1/+1
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>
2016-02-02trafgen: proto: Simplify getting lower protocol after initVadim Kochan1-3/+1
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>
2016-01-29trafgen: l2: Make needlessly global symbol eth_fields staticTobias Klauser1-1/+1
This fixes the following sparse warning: trafgen_l2.c:13:20: warning: symbol 'eth_fields' was not declared. Should it be static? Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-01-29trafgen: parser: Support "etype"/"type" keywords for EthertypeTobias Klauser1-2/+2
The IEEE 802.3 standard commonly refers to the field specifying the upper layer protocol as Ethertype, not protocol. Thus, also support the keywords "etype" and "type" for this field. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-01-28trafgen: l2: Add ARP header generation logicVadim Kochan1-0/+50
Add ARP protocol header fields generation. By default htype ethernet (1) and ptype IPv4 (0x0800) and the corresponding hlen/plen values will be initialized and the opcode is set to ARP Request (1). Source MAC and IP address are set to the device's addresses if not specified. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> [tk: rephrase and extend commit message] Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2016-01-28trafgen: l2: Add Ethernet protocol header generationVadim Kochan1-0/+32
Add trafgen_l2.c module for generating L2 related headers. Add Ethernet header generating. By default source MAC address is used from the specified output device. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>