Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* Copyright (c) 2017 Facebook
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * modify it under the terms of version 2 of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * License as published by the Free Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * BPF program to set initial receive window to 40 packets and send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * and receive buffers to 1.5MB. This would usually be done after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * doing appropriate checks that indicate the hosts are far enough
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * away (i.e. large RTT).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Use "bpftool cgroup attach $cg sock_ops $prog" to load this BPF program.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <uapi/linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <uapi/linux/if_ether.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <uapi/linux/if_packet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <uapi/linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <bpf/bpf_helpers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <bpf/bpf_endian.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define DEBUG 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) SEC("sockops")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int bpf_bufs(struct bpf_sock_ops *skops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	int bufsize = 1500000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	int rwnd_init = 40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	int rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	int op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	/* For testing purposes, only execute rest of BPF program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	 * if neither port numberis 55601
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	if (bpf_ntohl(skops->remote_port) != 55601 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	    skops->local_port != 55601) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		skops->reply = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	op = (int) skops->op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	bpf_printk("Returning %d\n", rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	/* Usually there would be a check to insure the hosts are far
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	 * from each other so it makes sense to increase buffer sizes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	switch (op) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	case BPF_SOCK_OPS_RWND_INIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		rv = rwnd_init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	case BPF_SOCK_OPS_TCP_CONNECT_CB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		/* Set sndbuf and rcvbuf of active connections */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 				    sizeof(bufsize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 				     &bufsize, sizeof(bufsize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 		/* Nothing to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		/* Set sndbuf and rcvbuf of passive connections */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		rv = bpf_setsockopt(skops, SOL_SOCKET, SO_SNDBUF, &bufsize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 				    sizeof(bufsize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		rv += bpf_setsockopt(skops, SOL_SOCKET, SO_RCVBUF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 				     &bufsize, sizeof(bufsize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		rv = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	bpf_printk("Returning %d\n", rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	skops->reply = rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) char _license[] SEC("license") = "GPL";