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78b1fc05b2
The protosw KPI historically has implemented two quite orthogonal things: protocols that implement a certain kind of socket, and protocols that are IPv4/IPv6 protocol. These two things do not make one-to-one correspondence. The pr_input and pr_ctlinput methods were utilized only in IP protocols. This strange duality required IP protocols that doesn't have a socket to declare protosw, e.g. carp(4). On the other hand developers of socket protocols thought that they need to define pr_input/pr_ctlinput always, which lead to strange dead code, e.g. div_input() or sdp_ctlinput(). With this change pr_input and pr_ctlinput as part of protosw disappear and IPv4/IPv6 get their private single level protocol switch table ip_protox[] and ip6_protox[] respectively, pointing at array of ipproto_input_t functions. The pr_ctlinput that was used for control input coming from the network (ICMP, ICMPv6) is now represented by ip_ctlprotox[] and ip6_ctlprotox[]. ipproto_register() becomes the only official way to register in the table. Those protocols that were always static and unlikely anybody is interested in making them loadable, are now registered by ip_init(), ip6_init(). An IP protocol that considers itself unloadable shall register itself within its own private SYSINIT(). Reviewed by: tuexen, melifaro Differential revision: https://reviews.freebsd.org/D36157