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Mike Karels efe58855f3 IPv4: experimental changes to allow net 0/8, 240/4, part of 127/8 
Combined changes to allow experimentation with net 0/8 (network 0),
240/4 (Experimental/"Class E"), and part of the loopback net 127/8
(all but 127.0/16).  All changes are disabled by default, and can be
enabled by the following sysctls:

    net.inet.ip.allow_net0=1
    net.inet.ip.allow_net240=1
    net.inet.ip.loopback_prefixlen=16

When enabled, the corresponding addresses can be used as normal
unicast IP addresses, both as endpoints and when forwarding.

Add descriptions of the new sysctls to inet.4.

Add <machine/param.h> to vnet.h, as CACHE_LINE_SIZE is undefined in
various C files when in.h includes vnet.h.

The proposals motivating this experimentation can be found in

    https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0
    https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240
    https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127

Reviewed by:	rgrimes, pauamma_gundo.com; previous versions melifaro, glebius
Differential Revision: https://reviews.freebsd.org/D35741
2022-07-13 09:46:05 -05:00
..
altq altq: mark callouts as mpsafe 2021-09-04 17:26:10 +02:00
route ddb: use _FLAGS command macros where appropriate 2022-07-05 11:56:55 -03:00
bpf_buffer.c
bpf_buffer.h
bpf_filter.c
bpf_jitter.c Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
bpf_jitter.h
bpf_zerocopy.c
bpf_zerocopy.h
bpf.c bpf: Zero pad bytes preceding BPF headers 2022-06-20 12:48:13 -04:00
bpf.h bpf: Correct a comment 2022-06-20 12:48:13 -04:00
bpfdesc.h bpf: Add an ioctl to set the VLAN Priority on packets sent by bpf 2021-07-26 23:13:31 +02:00
bridgestp.c bridgestp: validate timer values in config BPDU 2021-04-19 12:09:18 +02:00
bridgestp.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
debugnet_inet.c debugnet: Fix false-positive assertions for dp_state 2021-07-28 16:34:14 -07:00
debugnet_int.h
debugnet.c debugnet: Fix an error handling bug in the DDB command tokenizer 2022-06-16 10:05:10 -04:00
debugnet.h
dlt.h net(4): Fix a typo in a source code comment 2022-04-02 14:57:06 +02:00
ethernet.h net(3): Fix a typo in a source code comment 2022-04-02 10:53:40 +02:00
firewire.h
ieee8023ad_lacp.c lacp: Remove racy kassert 2022-06-13 11:32:10 -04:00
ieee8023ad_lacp.h lacp: short timeout erroneously declares link-flapping 2022-04-27 12:41:30 -07:00
ieee_oui.h Remove "All Rights Reserved" from FreeBSD Foundation sys/ copyrights 2021-08-08 10:42:24 -04:00
if_arp.h
if_bridge.c if_bridge: change MTU for new members 2022-06-27 08:27:27 +02:00
if_bridgevar.h net: make if_bridgevar.h self-contained 2021-12-17 12:38:35 +01:00
if_clone.c if_clone: correctly destroy a clone from a different vnet 2022-01-24 21:07:16 -08:00
if_clone.h if_clone: Fix a typo in a source code comment 2022-07-03 15:13:32 +02:00
if_dead.c Add a switch structure for send tags. 2021-09-14 11:43:41 -07:00
if_disc.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
if_dl.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
if_edsc.c if_edsc: generate an arbitrary MAC address 2020-03-02 02:45:57 +00:00
if_enc.c Consistently include opt_ipsec.h for consumers of <netipsec/ipsec.h>. 2020-05-29 19:22:40 +00:00
if_enc.h
if_epair.c epair: unbind prior to returning to userspace 2022-05-07 18:17:33 +02:00
if_ethersubr.c ether_resolve_addr: eh is only used for INET or INET6. 2022-04-13 16:08:21 -07:00
if_fwsubr.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
if_gif.c if_gif: fix vnet shutdown panic 2021-11-08 12:00:00 +01:00
if_gif.h gif_transmit() must always be called in the network epoch. 2020-01-15 06:18:32 +00:00
if_gre.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
if_gre.h
if_infiniband.c infiniband_resolve_addr: ih is only used for INET or INET6. 2022-04-13 16:08:21 -07:00
if_ipsec.c Use network epoch to protect local IPv4 addresses hash. 2021-10-22 14:40:53 -07:00
if_ipsec.h
if_lagg.c lagg(4): Add support for allocating TLS receive tags. 2022-06-07 12:54:42 +02:00
if_lagg.h Fix for IPoIB over lagg(4). 2020-12-29 17:35:06 +01:00
if_llatbl.c if_llatbl: Fix a typo in a debug statement 2022-06-04 15:22:09 +02:00
if_llatbl.h netinet6: Fix mbuf leak in NDP 2022-05-31 21:06:14 +00:00
if_llc.h
if_loop.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
if_me.c Use network epoch to protect local IPv4 addresses hash. 2021-10-22 14:40:53 -07:00
if_media.c if_media.c SIOCGMEDIAX handler: improve loop 2020-11-03 14:33:04 +00:00
if_media.h if_media: definitions for 40GE LM4 ethernet media type 2020-09-16 14:45:16 +00:00
if_mib.c ifnet: make V_if_index static to if.c 2021-12-06 09:32:31 -08:00
if_mib.h
if_ovpn.c if_ovpn: fix mbuf leak 2022-07-12 14:19:25 +02:00
if_ovpn.h ovpn: Introduce OpenVPN DCO support 2022-06-28 11:33:10 +02:00
if_pflog.h pflog: align header to 4 bytes, not 8 2022-02-01 18:17:44 +01:00
if_pfsync.h pf: make if_pfsync.h self-contained 2021-12-17 12:38:35 +01:00
if_stf.c if_stf: KASAN fix 2021-11-30 17:35:15 +01:00
if_stf.h if_stf: make if_stf.h self-contained 2021-12-17 12:38:34 +01:00
if_tap.h
if_tun.h
if_tuntap.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
if_types.h net(3): Fix a typo in a source code comment 2022-04-02 09:41:10 +02:00
if_var.h struct ifnet: add if_capabilities2 and if_capenable2 bitmasks 2022-05-24 23:59:32 +03:00
if_vlan_var.h vlan: deduplicate bpf_setpcp() and pf_ieee8021q_setpcp() 2021-07-26 23:13:31 +02:00
if_vlan.c vlan(4): Add support for allocating TLS receive tags. 2022-06-07 12:54:42 +02:00
if_vxlan.c vxlan: Add support for socket ioctls SIOC[SG]TUNFIB 2022-07-08 18:14:19 +00:00
if_vxlan.h if_vxlan(4): add support for hardware assisted checksumming, TSO, and RSS. 2020-09-18 02:37:57 +00:00
if.c netinet6: fix ndp proxying 2022-05-30 10:53:33 +00:00
if.h arp: Implement sticky ARP mode for interfaces. 2022-05-27 12:41:30 +00:00
ifdi_if.m iflib: add support for admin completion queues 2021-03-03 00:40:47 +01:00
iflib_clone.c Create wrapper for Giant taken for newbus 2021-12-09 17:04:45 -07:00
iflib_private.h
iflib.c iflib: Use empty inline functions for prefetch*() on non-x86. 2022-04-08 17:25:14 -07:00
iflib.h iflib: Allow drivers to determine which queue to TX on 2022-01-24 18:22:02 -08:00
ifq.h Make net/ifq.h C++ friendly 2020-11-20 14:45:45 +00:00
infiniband.h Factor out generic IP over infiniband, IPoIB, definitions and code 2020-10-22 09:09:53 +00:00
mp_ring.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
mp_ring.h
mppc.h
mppcc.c kernel: provide panicky version of __unreachable 2020-05-13 18:07:37 +00:00
mppcd.c
netisr_internal.h
netisr.c netisr: serialize/restore m_pkthdr.rcvif when queueing mbufs 2022-05-05 14:38:07 -04:00
netisr.h
netmap_legacy.h netmap: add kernel support for the "offsets" feature 2021-03-29 16:29:01 +00:00
netmap_user.h netmap: fix refcount bug in netmap allocator 2022-03-06 16:39:16 +00:00
netmap_virt.h netmap: add kernel support for the "offsets" feature 2021-03-29 16:29:01 +00:00
netmap.h netmap: several typo fixes 2021-04-02 07:01:20 +00:00
paravirt.h
pfil.c net: whack "set but not used" warnings in net/pfil.c 2021-11-14 17:19:58 +00:00
pfil.h
pfkeyv2.h Add SADB_SAFLAGS_ESN flag 2020-10-16 11:22:29 +00:00
pfvar.h pf: support matching on tags for Ethernet rules 2022-06-20 10:16:20 +02:00
ppp_defs.h
radix.c routing: Fix crashes with dpdk_lpm[46] algo. 2021-08-17 20:46:22 +00:00
radix.h routing: Fix crashes with dpdk_lpm[46] algo. 2021-08-17 20:46:22 +00:00
raw_cb.c Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
raw_cb.h protocols: init with standard SYSINIT(9) or VNET_SYSINIT 2022-01-03 10:15:21 -08:00
raw_usrreq.c protocols: init with standard SYSINIT(9) or VNET_SYSINIT 2022-01-03 10:15:21 -08:00
rndis.h Hyper-V: hn: Enable vSwitch RSC support in hn netvsc driver 2021-03-12 04:35:16 +00:00
route.c routing: fix source address selection rules for IPv4 over IPv6. 2021-09-07 21:41:05 +00:00
route.h net(3): Fix a typo in a source code comment 2022-04-02 09:24:48 +02:00
rss_config.c Revert "wpa: Import wpa_supplicant/hostapd commit 14ab4a816" 2021-12-02 14:45:04 -08:00
rss_config.h
rtsock.c routing: fix debug headers added in 6fa8ed43ee #2. 2022-06-26 07:28:15 +00:00
sff8436.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sff8472.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
slcompress.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
slcompress.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
toeplitz.c
toeplitz.h
vnet.c Widen ifnet_detach_sxlock coverage 2021-02-11 16:12:29 +01:00
vnet.h IPv4: experimental changes to allow net 0/8, 240/4, part of 127/8 2022-07-13 09:46:05 -05:00