forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.2 KiB
83 lines
2.2 KiB
/* Copyright (c) 2017 Facebook |
|
* |
|
* This program is free software; you can redistribute it and/or |
|
* modify it under the terms of version 2 of the GNU General Public |
|
* License as published by the Free Software Foundation. |
|
* |
|
* BPF program to set initial congestion window and initial receive |
|
* window to 40 packets and send and receive buffers to 1.5MB. This |
|
* would usually be done after doing appropriate checks that indicate |
|
* the hosts are far enough away (i.e. large RTT). |
|
* |
|
* Use "bpftool cgroup attach $cg sock_ops $prog" to load this BPF program. |
|
*/ |
|
|
|
#include <uapi/linux/bpf.h> |
|
#include <uapi/linux/if_ether.h> |
|
#include <uapi/linux/if_packet.h> |
|
#include <uapi/linux/ip.h> |
|
#include <linux/socket.h> |
|
#include <bpf/bpf_helpers.h> |
|
#include <bpf/bpf_endian.h> |
|
|
|
#define DEBUG 1 |
|
|
|
SEC("sockops") |
|
int bpf_iw(struct bpf_sock_ops *skops) |
|
{ |
|
int bufsize = 1500000; |
|
int rwnd_init = 40; |
|
int iw = 40; |
|
int rv = 0; |
|
int op; |
|
|
|
/* For testing purposes, only execute rest of BPF program |
|
* if neither port numberis 55601 |
|
*/ |
|
if (bpf_ntohl(skops->remote_port) != 55601 && |
|
skops->local_port != 55601) { |
|
skops->reply = -1; |
|
return 1; |
|
} |
|
|
|
op = (int) skops->op; |
|
|
|
#ifdef DEBUG |
|
bpf_printk("BPF command: %d\n", op); |
|
#endif |
|
|
|
/* Usually there would be a check to insure the hosts are far |
|
* from each other so it makes sense to increase buffer sizes |
|
*/ |
|
switch (op) { |
|
case BPF_SOCK_OPS_RWND_INIT: |
|
rv = rwnd_init; |
|
break; |
|
case BPF_SOCK_OPS_TCP_CONNECT_CB: |
|
/* Set sndbuf and rcvbuf of active connections */ |
|
rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize, |
|
sizeof(bufsize)); |
|
rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, |
|
&bufsize, sizeof(bufsize)); |
|
break; |
|
case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: |
|
rv = bpf_setsockopt(skops, SOL_TCP, TCP_BPF_IW, &iw, |
|
sizeof(iw)); |
|
break; |
|
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: |
|
/* Set sndbuf and rcvbuf of passive connections */ |
|
rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize, |
|
sizeof(bufsize)); |
|
rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF, |
|
&bufsize, sizeof(bufsize)); |
|
break; |
|
default: |
|
rv = -1; |
|
} |
|
#ifdef DEBUG |
|
bpf_printk("Returning %d\n", rv); |
|
#endif |
|
skops->reply = rv; |
|
return 1; |
|
} |
|
char _license[] SEC("license") = "GPL";
|
|
|