src/sys/net/bpfdesc.h, branch releng/14.4

sys: Remove $FreeBSD$: two-line .h pattern

2023-08-16T17:54:11Z

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

bpf: Add an ioctl to set the VLAN Priority on packets sent by bpf

2021-07-26T21:13:31Z

This allows the use of VLAN PCP in dhclient, which is required for certain ISPs (such as Orange.fr). Reviewed by: bcr (man page) MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D31263

Rework locking in BPF code to remove rwlock from fast path.

2019-05-13T13:45:28Z

On high packets rate the contention on rwlock in bpf_*tap*() functions can lead to packets dropping. To avoid this, migrate this code to use epoch(9) KPI and ConcurrencyKit's lists. * all lists changed to use CK_LIST; * reference counting added to bpf_if and bpf_d; * now bpf_if references ifnet and releases this reference on destroy; * each bpf_d descriptor references bpf_if when it is attached; * new struct bpf_program_buffer introduced to keep BPF filter programs; * bpf_program_buffer, bpf_d and bpf_if structures are freed by epoch_call(); * bpf_freelist and ifnet_departure event are no longer needed, thus both are removed; Reviewed by: melifaro Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D20224

Move BPFIF_* macro definitions into .c file, where struct bpf_if is

2018-06-19T10:34:45Z

declared. They are only used in this file and there is no need to export them via bpfdesc.h.

Make BPF global lock an SX

2018-04-10T19:42:50Z

This allows NIC drivers to sleep on polling config operations. Submitted by: Matthew Macy Reviewed by: shurd Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D14982

Use count(9) api for the bpf(4) statistics.

2018-03-20T22:57:06Z

Currently each bfp descriptor uses u64 variables to maintain its counters. On interfaces with high packet rate this leads to unnecessary contention and inaccurate reporting. PR: kern/205320 Reported by: elofu17 at hotmail.com MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D14726

sys: further adoption of SPDX licensing ID tags.

2017-11-20T19:43:44Z

Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that 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 of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.

Renumber copyright clause 4

2017-02-28T23:42:47Z

Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann Pull Request: https://github.com/freebsd/freebsd/pull/96

Changes to resolve races in bpfread() and catchpacket() that, at worst,

2012-12-10T16:14:44Z

cause kernel panics. Add a flag to the bpf descriptor to indicate whether the hold buffer is in use. In bpfread(), set the "hold buffer in use" flag before dropping the descriptor lock during the call to bpf_uiomove(). Everywhere else the hold buffer is used or changed, wait while the hold buffer is in use by bpfread(). Add a KASSERT in bpfread() after re-acquiring the descriptor lock to assist uncovering any additional hold buffer races.

Fix old panic when BPF consumer attaches to destroying interface.

2012-05-21T22:17:29Z

'flags' field is added to the end of bpf_if structure. Currently the only flag is BPFIF_FLAG_DYING which is set on bpf detach and checked by bpf_attachd() Problem can be easily triggered on SMP stable/[89] by the following command (sort of): 'while true; do ifconfig vlan222 create vlan 222 vlandev em0 up ; tcpdump -pi vlan222 & ; ifconfig vlan222 destroy ; done' Fix possible use-after-free when BPF detaches itself from interface, freeing bpf_bif memory, while interface is still UP and there can be routes via this interface. Freeing is now delayed till ifnet_departure_event is received via eventhandler(9) api. Convert bpfd rwlock back to mutex due lack of performance gain (currently checking if packet matches filter is done without holding bpfd lock and we have to acquire write lock if packet matches) Approved by: kib(mentor) MFC in: 4 weeks