Changes in ip_encap.c

7b71f57f4e514a2ab7308ce4147e14d90e099ad0 - netinet: Remove left-over sys/cdefs.h

Wed, 03 Dec 2025 06:02:10 +0100

netinet: Remove left-over sys/cdefs.hThese were for $FreeBSD$ that was removed a while ago, but theseincludes didn't get swept up in that. Remove them all now.Sponsored by: NetflixMFC After: 2 weeks List of files: /freebsd/sys/netinet/ip_encap.c

685dc743dc3b5645e34836464128e1c0558b404b - sys: Remove $FreeBSD$: one-line .c pattern

Wed, 16 Aug 2023 19:54:36 +0200

sys: Remove $FreeBSD$: one-line .c patternRemove /^[\s*]*__FBSDID$"\$FreeBSD\$"$;?\s*\n/ List of files: /freebsd/sys/netinet/ip_encap.c

8b3bc70a2b2d3889f9163e5e5a24747cea6417e6 - Merge ^/head r352764 through r353315.

Tue, 08 Oct 2019 20:17:02 +0200

Merge ^/head r352764 through r353315. List of files: /freebsd/sys/netinet/ip_encap.c

b8a6e03fac922677455d8e0977831506cf8212e8 - Widen NET_EPOCH coverage.

Tue, 08 Oct 2019 00:40:05 +0200

Widen NET_EPOCH coverage.When epoch(9) was introduced to network stack, it was basicallydropped in place of existing locking, which was mutexes andrwlocks. For the sake of performance mutex covered areas wereas small as possible, so became epoch covered areas.However, epoch doesn't introduce any contention, it just delaysmemory reclaim. So, there is no point to minimise epoch coveredareas in sense of performance. Meanwhile entering/exiting epochalso has non-zero CPU usage, so doing this less often is a win.Not the least is also code maintainability. In the new paradigmwe can assume that at any stage of processing a packet, we areinside network epoch. This makes coding both input and outputpath way easier.On output path we already enter epoch quite early - in theip_output(), in the ip6_output().This patch does the same for the input path. All ISR processing,network related callouts, other ways of packet injection to thenetwork stack shall be performed in net_epoch. Any leaf functionthat walks network configuration now asserts epoch.Tricky part is configuration code paths - ioctls, sysctls. Theyalso call into leaf functions, so some need to be changed.This patch would introduce more epoch recursions (see EPOCH_TRACE)than we had before. They will be cleaned up separately, as severalof them aren't trivial. Note, that unlike a lock recursion theepoch recursion is safe and just wastes a bit of resources.Reviewed by: gallatin, hselasky, cy, adrian, kristofDifferential Revision: https://reviews.freebsd.org/D19111 List of files: /freebsd/sys/netinet/ip_encap.c

c6879c6c14eedbd060ba588a3129a6c60ebbe783 - Merge ^/head r339015 through r339669.

Tue, 23 Oct 2018 23:09:37 +0200

Merge ^/head r339015 through r339669. List of files: /freebsd/sys/netinet/ip_encap.c

f252e3f2f2237f89015fcf68397ebfd66f14c63d - Include to fix the build.

Sun, 21 Oct 2018 20:39:34 +0200

Include to fix the build.MFC after: 1 month List of files: /freebsd/sys/netinet/ip_encap.c

8251c68d5c8f068fbf8462b8809517d45f8fed86 - Add KPI that can be used by tunneling interfaces to handle IP addresses

Sun, 21 Oct 2018 19:55:26 +0200

Add KPI that can be used by tunneling interfaces to handle IP addressesappearing and disappearing on the host system.Such handling is need, because tunneling interfaces must use addresses,that are configured on the host as ingress addresses for tunnels.Otherwise the system can send spoofed packets with source address, thatbelongs to foreign host.The KPI uses ifaddr_event_ext event to implement addresses tracking.Tunneling interfaces register event handlers and then they arenotified by the kernel, when an address disappears or appears.ifaddr_event_compat() handler from if.c replaced by srcaddr_change_event()in the ip_encap.cMFC after: 1 monthSponsored by: Yandex LLCDifferential Revision: https://reviews.freebsd.org/D17134 List of files: /freebsd/sys/netinet/ip_encap.c

6573d7580b851d794b6c3cbd5ee3d7bf0b4c0ccb - epoch(9): allow preemptible epochs to compose

Wed, 04 Jul 2018 04:47:16 +0200

epoch(9): allow preemptible epochs to compose- Add tracker argument to preemptible epochs- Inline epoch read path in kernel and tied modules- Change in_epoch to take an epoch as argument- Simplify tfb_tcp_do_segment to not take a ti_locked argument, there's no longer any benefit to dropping the pcbinfo lock and trying to do so just adds an error prone branchfest to these functions- Remove cases of same function recursion on the epoch as recursing is no longer free.- Remove the the TAILQ_ENTRY and epoch_section from struct thread as the tracker field is now stack or heap allocated as appropriate.Tested by: pho and Limelight NetworksReviewed by: kbowling at llnw dot comSponsored by: Limelight NetworksDifferential Revision: https://reviews.freebsd.org/D16066 List of files: /freebsd/sys/netinet/ip_encap.c

6d8fdfa9d5e7d4871c5039b0131829f9cbefeee9 - Rework IP encapsulation handling code.

Tue, 05 Jun 2018 22:51:01 +0200

Rework IP encapsulation handling code.Currently it has several disadvantages:- it uses single mutex to protect internal structures. It is used by data- and control- path, thus there are no parallelism at all.- it uses single list to keep encap handlers for both INET and INET6 families.- struct encaptab keeps unneeded information (src, dst, masks, protosw), that isn't used by code in the source tree.- matches are prioritized and when many tunneling interfaces are registered, encapcheck handler of each interface is invoked for each packet. The search takes O(n) for n interfaces. All this work is done with exclusive lock held.What this patch includes:- the datapath is converted to be lockless using epoch(9) KPI.- struct encaptab now linked using CK_LIST.- all unused fields removed from struct encaptab. Several new fields addedr: min_length is the minimum packet length, that encapsulation handler expects to see; exact_match is maximum number of bits, that can return an encapsulation handler, when it wants to consume a packet.- IPv6 and IPv4 handlers are stored in separate lists;- added new "encap_lookup_t" method, that will be used later. It is targeted to speedup lookup of needed interface, when gif(4)/gre(4) have many interfaces.- the need to use protosw structure is eliminated. The only pr_input method was used from this structure, so I don't see the need to keep using it.- encap_input_t method changed to avoid using mbuf tags to store softc pointer. Now it is passed directly trough encap_input_t method. encap_getarg() funtions is removed.- all sockaddr structures and code that uses them removed. We don't have any code in the tree that uses them. All consumers use encap_attach_func() method, that relies on invoking of encapcheck() to determine the needed handler.- introduced struct encap_config, it contains parameters of encap handler that is going to be registered by encap_attach() function.- encap handlers are stored in lists ordered by exact_match value, thus handlers that need more bits to match will be checked first, and if encapcheck method returns exact_match value, the search will be stopped.- all current consumers changed to use new KPI.Reviewed by: mmacySponsored by: Yandex LLCDifferential Revision: https://reviews.freebsd.org/D15617 List of files: /freebsd/sys/netinet/ip_encap.c

12e7376216e0cb3792a5f69ef356901abba9e496 - Remove empty encap_init() function.

Tue, 29 May 2018 14:32:08 +0200

Remove empty encap_init() function.MFC after: 2 weeks List of files: /freebsd/sys/netinet/ip_encap.c

82725ba9bf1fd59746a4006a06f24d4d61d142f2 - Merge ^/head r325999 through r326131.

Thu, 23 Nov 2017 15:28:14 +0100

Merge ^/head r325999 through r326131. List of files: /freebsd/sys/netinet/ip_encap.c

51369649b03ece2aed3eb61b0c8214b9aa5b2fa2 - sys: further adoption of SPDX licensing ID tags.

Mon, 20 Nov 2017 20:43:44 +0100

sys: further adoption of SPDX licensing ID tags.Mainly focus on files that use BSD 3-Clause license.The Software Package Data Exchange (SPDX) group provides a specificationto make it easier for automated tools to detect and summarize well knownopensource licenses. We are gradually adopting the specification, notingthat the tags are considered only advisory and do not, in any way,superceed or replace the license texts.Special thanks to Wind River for providing access to "The Duke ofHighlander" tool: an older (2014) run over FreeBSD tree was useful as astarting point. List of files: /freebsd/sys/netinet/ip_encap.c

009e81b16465ea457c0e63fd49fe77f47cc27a5a - MFH @r294567

Fri, 22 Jan 2016 16:11:40 +0100

MFH @r294567 List of files: /freebsd/sys/netinet/ip_encap.c

e60680024afe8ec84ded577e77965e9a44595f2b - MFH

Tue, 12 Jan 2016 02:23:45 +0100

MFHSponsored by: The FreeBSD Foundation List of files: /freebsd/sys/netinet/ip_encap.c

89d3f0ea4e8855563263f5d05289538d9ce0e3de - Merge ^/head r293430 through r293685.

Mon, 11 Jan 2016 20:36:44 +0100

Merge ^/head r293430 through r293685. List of files: /freebsd/sys/netinet/ip_encap.c

ea8d14925c6a7e96949493984f558411d0fa4380 - Remove sys/eventhandler.h from net/route.h

Sat, 09 Jan 2016 10:34:39 +0100

Remove sys/eventhandler.h from net/route.hReviewed by: ae List of files: /freebsd/sys/netinet/ip_encap.c

416ba5c74546f32a993436a99516d35008e9f384 - Catch up with HEAD (r280229-r284686).

Mon, 22 Jun 2015 02:05:22 +0200

Catch up with HEAD (r280229-r284686). List of files: /freebsd/sys/netinet/ip_encap.c

76aeda8ad4e2c1ae78bf1388a5d6e793d84d8c53 - Merge ^/head r284188 through r284643.

Sat, 20 Jun 2015 21:34:50 +0200

Merge ^/head r284188 through r284643. List of files: /freebsd/sys/netinet/ip_encap.c

2fbd60ec4724bc5eebc0870e28620e75ae447922 - Merge from head @274131

Sat, 20 Jun 2015 02:58:46 +0200

Merge from head @274131 List of files: /freebsd/sys/netinet/ip_encap.c

efb5228ce87158dda1e50d20c9179ac7fb6d9f48 - Fix possible use after free in encap[46]_input().

Thu, 18 Jun 2015 20:28:38 +0200

Fix possible use after free in encap[46]_input().There is small window, when encap_detach() can free matched entrydirectly after we release encapmtx. Instead of use pointer to thematched entry, save pointers to needed variables from this entryand use them after release mutex.Pass argument stored in the encaptab entry to encap_fillarg(), insteadof pointer to matched entry. Also do not allocate new mbuf tag, whenargument that we plan to save in this tag is NULL.Also make encaptab variable static.Obtained from: Yandex LLCSponsored by: Yandex LLC List of files: /freebsd/sys/netinet/ip_encap.c