965ae44412
This patch is to add the functions to create/release udp4 sock, and set the sock's encap_rcv to process the incoming udp encap sctp packets. In sctp_udp_rcv(), as we can see, all we need to do is fix the transport header for sctp_rcv(), then it would implement the part of rfc6951#section-5.4: "When an encapsulated packet is received, the UDP header is removed. Then, the generic lookup is performed, as done by an SCTP stack whenever a packet is received, to find the association for the received SCTP packet" Note that these functions will be called in the last patch of this patchset when enabling this feature. v1->v2: - Add pr_err() when fails to create udp v4 sock. v2->v3: - Add 'select NET_UDP_TUNNEL' in sctp Kconfig. v3->v4: - No change. v4->v5: - Change to set udp_port to 0 by default. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2.8 KiB
SPDX-License-Identifier: GPL-2.0-only
SCTP configuration
menuconfig IP_SCTP tristate "The SCTP Protocol" depends on INET depends on IPV6 || IPV6=n select CRYPTO select CRYPTO_HMAC select CRYPTO_SHA1 select LIBCRC32C select NET_UDP_TUNNEL help Stream Control Transmission Protocol
From RFC 2960 <http://www.ietf.org/rfc/rfc2960.txt>.
"SCTP is a reliable transport protocol operating on top of a
connectionless packet network such as IP. It offers the following
services to its users:
-- acknowledged error-free non-duplicated transfer of user data,
-- data fragmentation to conform to discovered path MTU size,
-- sequenced delivery of user messages within multiple streams,
with an option for order-of-arrival delivery of individual user
messages,
-- optional bundling of multiple user messages into a single SCTP
packet, and
-- network-level fault tolerance through supporting of multi-
homing at either or both ends of an association."
To compile this protocol support as a module, choose M here: the
module will be called sctp. Debug messages are handled by the
kernel's dynamic debugging framework.
If in doubt, say N.
if IP_SCTP
config SCTP_DBG_OBJCNT bool "SCTP: Debug object counts" depends on PROC_FS help If you say Y, this will enable debugging support for counting the type of objects that are currently allocated. This is useful for identifying memory leaks. This debug information can be viewed by 'cat /proc/net/sctp/sctp_dbg_objcnt'
If unsure, say N
choice prompt "Default SCTP cookie HMAC encoding" default SCTP_DEFAULT_COOKIE_HMAC_MD5 help This option sets the default sctp cookie hmac algorithm when in doubt select 'md5'
config SCTP_DEFAULT_COOKIE_HMAC_MD5 bool "Enable optional MD5 hmac cookie generation" help Enable optional MD5 hmac based SCTP cookie generation select SCTP_COOKIE_HMAC_MD5
config SCTP_DEFAULT_COOKIE_HMAC_SHA1 bool "Enable optional SHA1 hmac cookie generation" help Enable optional SHA1 hmac based SCTP cookie generation select SCTP_COOKIE_HMAC_SHA1
config SCTP_DEFAULT_COOKIE_HMAC_NONE bool "Use no hmac alg in SCTP cookie generation" help Use no hmac algorithm in SCTP cookie generation
endchoice
config SCTP_COOKIE_HMAC_MD5 bool "Enable optional MD5 hmac cookie generation" help Enable optional MD5 hmac based SCTP cookie generation select CRYPTO_HMAC if SCTP_COOKIE_HMAC_MD5 select CRYPTO_MD5 if SCTP_COOKIE_HMAC_MD5
config SCTP_COOKIE_HMAC_SHA1 bool "Enable optional SHA1 hmac cookie generation" help Enable optional SHA1 hmac based SCTP cookie generation select CRYPTO_HMAC if SCTP_COOKIE_HMAC_SHA1 select CRYPTO_SHA1 if SCTP_COOKIE_HMAC_SHA1
config INET_SCTP_DIAG depends on INET_DIAG def_tristate INET_DIAG
endif # IP_SCTP