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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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7cf245a37e
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* Copyright (c) 2017 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* Sample BPF program to set send and receive buffers to 150KB, sndcwnd clamp
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* to 100 packets and SYN and SYN_ACK RTOs to 10ms when both hosts are within
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* the same datacenter. For his example, we assume they are within the same
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* datacenter when the first 5.5 bytes of their IPv6 addresses are the same.
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*
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* Use "bpftool cgroup attach $cg sock_ops $prog" to load this BPF program.
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*/
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_ether.h>
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#include <uapi/linux/if_packet.h>
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#include <uapi/linux/ip.h>
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#include <linux/socket.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#define DEBUG 1
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SEC("sockops")
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int bpf_clamp(struct bpf_sock_ops *skops)
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{
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int bufsize = 150000;
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int to_init = 10;
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int clamp = 100;
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int rv = 0;
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int op;
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/* For testing purposes, only execute rest of BPF program
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* if neither port numberis 55601
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*/
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if (bpf_ntohl(skops->remote_port) != 55601 && skops->local_port != 55601) {
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skops->reply = -1;
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return 0;
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}
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op = (int) skops->op;
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#ifdef DEBUG
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bpf_printk("BPF command: %d\n", op);
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#endif
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/* Check that both hosts are within same datacenter. For this example
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* it is the case when the first 5.5 bytes of their IPv6 addresses are
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* the same.
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*/
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if (skops->family == AF_INET6 &&
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skops->local_ip6[0] == skops->remote_ip6[0] &&
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(bpf_ntohl(skops->local_ip6[1]) & 0xfff00000) ==
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(bpf_ntohl(skops->remote_ip6[1]) & 0xfff00000)) {
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switch (op) {
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case BPF_SOCK_OPS_TIMEOUT_INIT:
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rv = to_init;
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break;
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case BPF_SOCK_OPS_TCP_CONNECT_CB:
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/* Set sndbuf and rcvbuf of active connections */
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rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF,
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&bufsize, sizeof(bufsize));
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rv += bpf_setsockopt(skops, SOL_SOCKET,
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SO_RCVBUF, &bufsize,
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sizeof(bufsize));
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break;
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case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
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rv = bpf_setsockopt(skops, SOL_TCP,
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TCP_BPF_SNDCWND_CLAMP,
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&clamp, sizeof(clamp));
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break;
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case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
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/* Set sndbuf and rcvbuf of passive connections */
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rv = bpf_setsockopt(skops, SOL_TCP,
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TCP_BPF_SNDCWND_CLAMP,
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&clamp, sizeof(clamp));
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rv += bpf_setsockopt(skops, SOL_SOCKET,
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SO_SNDBUF, &bufsize,
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sizeof(bufsize));
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rv += bpf_setsockopt(skops, SOL_SOCKET,
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SO_RCVBUF, &bufsize,
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sizeof(bufsize));
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break;
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default:
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rv = -1;
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}
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} else {
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rv = -1;
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}
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#ifdef DEBUG
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bpf_printk("Returning %d\n", rv);
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#endif
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skops->reply = rv;
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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