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Jakub Sitnicki 9a69e2b385 bpf: Make remote_port field in struct bpf_sk_lookup 16-bit wide 
remote_port is another case of a BPF context field documented as a 32-bit
value in network byte order for which the BPF context access converter
generates a load of a zero-padded 16-bit integer in network byte order.

First such case was dst_port in bpf_sock which got addressed in commit
4421a58271 ("bpf: Make dst_port field in struct bpf_sock 16-bit wide").

Loading 4-bytes from the remote_port offset and converting the value with
bpf_ntohl() leads to surprising results, as the expected value is shifted
by 16 bits.

Reduce the confusion by splitting the field in two - a 16-bit field holding
a big-endian integer, and a 16-bit zero-padding anonymous field that
follows it.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220209184333.654927-2-jakub@cloudflare.com
2022-02-09 11:40:45 -08:00
arch bpf: Fix leftover header->pages in sparc and powerpc code. 2022-02-08 14:52:05 -08:00
block SCSI misc on 20220113 2022-01-14 14:37:34 +01:00
certs certs: move scripts/extract-cert to certs/ 2022-01-08 18:28:21 +09:00
crypto lib/crypto: add prompts back to crypto libraries 2022-01-18 13:03:55 +01:00
Documentation bpf, docs: Better document the atomic instructions 2022-02-03 09:29:37 -08:00
drivers ice: xsk: Borrow xdp_tx_active logic from i40e 2022-01-27 17:25:33 +01:00
fs Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
include bpf: Make remote_port field in struct bpf_sk_lookup 16-bit wide 2022-02-09 11:40:45 -08:00
init kbuild: Add CONFIG_PAHOLE_VERSION 2022-02-02 11:19:33 +01:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel bpf: Fix bpf_prog_pack build HPAGE_PMD_SIZE 2022-02-08 18:37:10 -08:00
lib lib/Kconfig.debug: Allow BTF + DWARF5 with pahole 1.21+ 2022-02-02 11:19:34 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
net bpf: Make remote_port field in struct bpf_sk_lookup 16-bit wide 2022-02-09 11:40:45 -08:00
samples samples/bpf: Get rid of bpf_prog_load_xattr() use 2022-02-03 16:32:25 +01:00
scripts scripts/pahole-flags.sh: Use pahole-version.sh 2022-02-02 11:19:33 +01:00
security Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
sound virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes 2022-01-18 10:05:48 +02:00
tools libbpf: Fix compilation warning due to mismatched printf format 2022-02-09 14:33:32 +01:00
usr kbuild: rename cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22} 2022-01-14 02:54:05 +09:00
virt RISCV: 2022-01-16 16:15:14 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address of Brian Silverman 2022-01-24 18:27:23 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS kbuild: Add CONFIG_PAHOLE_VERSION 2022-02-02 11:19:33 +01:00
Makefile Kbuild updates for v5.17 2022-01-19 11:15:19 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.