src-test/sys/modules/if_enc, branch main

src-test/sys/modules/if_enc, branch main FreeBSD source tree https://cgit-dev.freebsd.org/src-test/atom?h=main 2020-05-29T19:29:10Z Add opt_ipsec.h to fix standalone builds after r361633. 2020-05-29T19:29:10Z John Baldwin jhb@FreeBSD.org 2020-05-29T19:29:10Z urn:sha1:6f9454895c71eac311a73745c2f860b783a9b161 sys/modules: normalize .CURDIR-relative paths to SRCTOP 2017-03-04T10:10:17Z Enji Cooper ngie@FreeBSD.org 2017-03-04T10:10:17Z urn:sha1:193d9e768ba63fcfb187cfd17f461f7d41345048 This simplifies make output/logic Tested with: `cd sys/modules; make ALL_MODULES=` on amd64 MFC after: 1 month Sponsored by: Dell EMC Isilon Overhaul if_enc(4) and make it loadable in run-time. 2015-11-25T07:31:59Z Andrey V. Elsukov ae@FreeBSD.org 2015-11-25T07:31:59Z urn:sha1:ef91a9765de04e47ad6812d9be6e76fc955ffd87 Use hhook(9) framework to achieve ability of loading and unloading if_enc(4) kernel module. INET and INET6 code on initialization registers two helper hooks points in the kernel. if_enc(4) module uses these helper hook points and registers its hooks. IPSEC code uses these hhook points to call helper hooks implemented in if_enc(4).