Packet sockets - revision history

Dank at 21:02, 14 June 2023

2023-06-14T21:02:55Z

← Older revision		Revision as of 21:02, 14 June 2023
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	Packet sockets allow a program to more directly interface with the networking stack than standard Layer 4 Berkeley sockets (e.g. AF_INET + SOCK_STREAM~~, AF_INET6 +~~ SOCK_DGRAM).		Packet sockets allow a program to more directly interface with the networking stack than standard Layer 4 Berkeley sockets (e.g. AF_INET/AF_INET6 + SOCK_STREAM/SOCK_DGRAM).

	==[[Linux APIs\|Linux]] packet sockets==		==[[Linux APIs\|Linux]] packet sockets==

2023-06-14T21:02:29Z

AF_INET/AF_INET6

← Older revision		Revision as of 21:02, 14 June 2023
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	* Packet ID (given a random value if set to 0)		* Packet ID (given a random value if set to 0)
	* Source address (selected via routing lookup if set to 0)		* Source address (selected via routing lookup if set to 0)
	The IP_HDRINCL (IPV6_HDRINCL) option is not ~~support~~ for IPv6 raw sockets.		The IP_HDRINCL (IPV6_HDRINCL) option is not supported for IPv6 raw sockets.
	===SOCK_RAW===		===SOCK_RAW===
	Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets. sendto() must be used with raw sockets, as opposed to a mere send(). When using an IPv6 raw socket, sin6_port must be set to 0 to avoid an EINVAL ("Invalid Argument") error.		Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets. sendto() must be used with raw sockets, as opposed to a mere send(). When using an IPv6 raw socket, sin6_port must be set to 0 to avoid an EINVAL ("Invalid Argument") error.

2022-01-24T14:31:57Z

2013-02-15T23:10:04Z

Linux Packet sockets

← Older revision		Revision as of 23:10, 15 February 2013
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	Packet sockets allow a program to more directly interface with the networking stack than standard Layer 4 Berkeley sockets (e.g. AF_INET + SOCK_STREAM, AF_INET6 + SOCK_DGRAM).		Packet sockets allow a program to more directly interface with the networking stack than standard Layer 4 Berkeley sockets (e.g. AF_INET + SOCK_STREAM, AF_INET6 + SOCK_DGRAM).

	==[[Linux APIs\|Linux]] ~~Packet~~ sockets==		==[[Linux APIs\|Linux]] packet sockets==
	The SOCK_PACKET socket type is strongly deprecated (see packet(7)), and thus not discussed here.		The SOCK_PACKET socket type is strongly deprecated (see packet(7)), and thus not discussed here.
	{\| class="wikitable" border="1"		{\| class="wikitable" border="1"

2011-11-14T04:28:20Z

Linux Packet sockets

← Older revision		Revision as of 04:28, 14 November 2011
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	\|-		\|-
	\| IP_HDRINCL-enabled PF_INET, SOCK_RAW		\| IP_HDRINCL-enabled PF_INET, SOCK_RAW
	(only one IP protocol per socket when protocol is other than IPPROTO_RAW)		(only one IP protocol per socket when protocol is other than IPPROTO_RAW,
			not valid for PF_INET6 sockets)
	\| Y		\| Y
	\| N		\| N

2011-11-14T02:47:59Z

SOCK_RAW

← Older revision		Revision as of 02:47, 14 November 2011
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	The IP_HDRINCL (IPV6_HDRINCL) option is not support for IPv6 raw sockets.		The IP_HDRINCL (IPV6_HDRINCL) option is not support for IPv6 raw sockets.
	===SOCK_RAW===		===SOCK_RAW===
	Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets.		Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets. sendto() must be used with raw sockets, as opposed to a mere send(). When using an IPv6 raw socket, sin6_port must be set to 0 to avoid an EINVAL ("Invalid Argument") error.

	===SOCK_PACKET===		===SOCK_PACKET===
	Obsolete since Linux 2.0.		Obsolete since Linux 2.0.

2011-11-14T02:36:55Z

AF_INET/AF_INET6

← Older revision		Revision as of 02:36, 14 November 2011
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	* Packet ID (given a random value if set to 0)		* Packet ID (given a random value if set to 0)
	* Source address (selected via routing lookup if set to 0)		* Source address (selected via routing lookup if set to 0)
			The IP_HDRINCL (IPV6_HDRINCL) option is not support for IPv6 raw sockets.
	===SOCK_RAW===		===SOCK_RAW===
	Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets.		Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets.

2011-11-13T21:07:24Z

AF_INET/AF_INET6

← Older revision		Revision as of 21:07, 13 November 2011
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	Cooked packets (common, protocol-independent link-layer header in a <tt>sockaddr_ll</tt>).		Cooked packets (common, protocol-independent link-layer header in a <tt>sockaddr_ll</tt>).
	==AF_INET/AF_INET6==		==AF_INET/AF_INET6==
	The protocol field restricts the Layer 3 protocols which will be passed to the socket; IPPROTO_RAW can set arbitrary IP protocol values, and thus implies the IP_HDRINCL socket option.		The protocol field restricts the Layer 3 protocols which will be passed to the socket; IPPROTO_RAW can set arbitrary IP protocol values (for transmission, but not reception), and thus implies the IP_HDRINCL socket option. Even if IP_HDRINCL is set, raw sockets might rewrite the following fields:
			* Total length
			* Checksum
			* Packet ID (given a random value if set to 0)
			* Source address (selected via routing lookup if set to 0)
	===SOCK_RAW===		===SOCK_RAW===
			Path MTU is performed on outgoing packets unless disabled via IP_MTU_DISCOVER sockopt, in which case they might be fragmented if they exceed the outgoing device's MTU (unless IP_HDRINCL is used). Fragment reassembly is performed before delivering packets to receiving sockets.
	===SOCK_PACKET===		===SOCK_PACKET===
	Obsolete since Linux 2.0.		Obsolete since Linux 2.0.

2011-11-13T20:48:40Z

Linux Packet sockets

← Older revision		Revision as of 20:48, 13 November 2011
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	\|-		\|-
	\| PF_INET		\| PF_INET
	(only one IP protocol per socket when protocol is other than IPPROTO_RAW, and only certain IP protocols are supported at all)		(only one IP protocol per socket when protocol is other than IPPROTO_RAW, and only certain IP protocols are supported at all when type is not SOCK_RAW)
	\| N		\| N
	\| N		\| N

2011-11-13T20:48:03Z

Linux Packet sockets

← Older revision		Revision as of 20:48, 13 November 2011
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	\| PF_INET		\| PF_INET
	(only one IP protocol per socket when protocol is other than IPPROTO_RAW, and only certain IP protocols are supported at all)		(only one IP protocol per socket when protocol is other than IPPROTO_RAW, and only certain IP protocols are supported at all)
	\| Y		\| N
	\| N		\| N
	\| 5+		\| 5+

← Older revision		Revision as of 14:31, 24 January 2022
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	==See also==		==See also==
	* [[Linux APIs]] and [[FreeBSD APIs]]		* [[Linux APIs]] and [[FreeBSD APIs]]
			* "[https://fly.io/blog/bpf-xdp-packet-filters-and-udp/ BPF, XDP, Packet Filters and UDP]" at fly.io