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Follow common coding style and use:
switch (...)
instead of:
switch(...)
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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It is potentially dangerous to use the user specified IHL field for
csum calculation, as it might lead to read buffer overflows.
Instead introduce and use the len field in struct proto_hdr which is
calculated automatically after the header is built.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
[tk: reword commit message]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Set default ip proto field to IPPROTO_IPV6(41) if the higher protocol
was specified as ipv6().
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Support for generating ICMPv4 headers using the 'icmp4()/icmpv4()'
trafgen generation functions.
Fields supported:
type Set type field (default 0: Echo reply)
Supported keywords: echorequest, echoreply
code Set code field (default 0)
csum Set checksum field (calculated by default)
mtu Set mtu field for destination unreachable (default 0)
seq Set sequence field (default 0)
id Set identifier field (default 0)
addr Set redirect address (default 0.0.0.0)
Example (send ping request):
{ icmpv4(echorequest, seq=1, id=1326) }
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
[tk: squash commits, consistency between functionality and docu]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Support for generating simple ICMPv6 headers using the 'icmp6()/icmpv6()'
trafgen generation function.
Fields supported:
mtype Message type (default: 0)
Supported keywords: echorequest, echoreply
code Code (default: 0)
csum Message checksum (calculated by default)
Examples:
{ eth(), ipv6(daddr=::1), icmpv6(echorequest), 42, 42, 0, 0 }'
If not explicitely specified, the lower header is initialized as Ethernet.
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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Support for generating simple IPv6 headers using the 'ip6()/ipv6()'
trafgen generation function.
Fields supported:
ver|version Version (default: 6)
tc|tclass Traffic class (default: 0)
fl|flow Flow Label (default: 0)
len|length Payload length (calculated by default)
nh|nexthdr Type of next header (default: 0)
hl|hoplimit|ttl Hop Limit, TTL (default: 0)
sa|saddr Source IPv6 address (default: device address)
da|daddr Destination IPv6 address (default: 0:0:0:0:0:0:0:0)
Examples:
{ eth(), ipv6(daddr=1:2:3:4:5:6:7:8) }
{ ipv6(tc=2, hl=3, daddr=::1) }
{ eth(), ipv6(nh=58, sa=2001:db8::, da=::1), 128, 0, 0x52, 0x03, 0, 0, 0, 0 }
If not explicitely specified, the lower header is initialized as Ethernet.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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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>
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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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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>
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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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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>
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Add L3 module for implement L3 layer protocols generation.
Implemented setting of IPv4 header with all fields except options.
By default IPv4 address of output device is used as src ip address.
On finish (after packet is specified) - total len & checksum are calculated.
Meanwhile Ethernet protocol is initialized as default lower header.
If the lower protocol is IPv4 then IPv4 protocol id is set
to IP-in-IP in lower protocol header.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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