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Linux/samples/bpf/tcp_synrto_kern.c

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  1 /* Copyright (c) 2017 Facebook
  2  *
  3  * This program is free software; you can redistribute it and/or
  4  * modify it under the terms of version 2 of the GNU General Public
  5  * License as published by the Free Software Foundation.
  6  *
  7  * BPF program to set SYN and SYN-ACK RTOs to 10ms when using IPv6 addresses
  8  * and the first 5.5 bytes of the IPv6 addresses are the same (in this example
  9  * that means both hosts are in the same datacenter).
 10  *
 11  * Use load_sock_ops to load this BPF program.
 12  */
 13 
 14 #include <uapi/linux/bpf.h>
 15 #include <uapi/linux/if_ether.h>
 16 #include <uapi/linux/if_packet.h>
 17 #include <uapi/linux/ip.h>
 18 #include <linux/socket.h>
 19 #include "bpf_helpers.h"
 20 #include "bpf_endian.h"
 21 
 22 #define DEBUG 1
 23 
 24 #define bpf_printk(fmt, ...)                                    \
 25 ({                                                              \
 26                char ____fmt[] = fmt;                            \
 27                bpf_trace_printk(____fmt, sizeof(____fmt),       \
 28                                 ##__VA_ARGS__);                 \
 29 })
 30 
 31 SEC("sockops")
 32 int bpf_synrto(struct bpf_sock_ops *skops)
 33 {
 34         int rv = -1;
 35         int op;
 36 
 37         /* For testing purposes, only execute rest of BPF program
 38          * if neither port numberis 55601
 39          */
 40         if (bpf_ntohl(skops->remote_port) != 55601 &&
 41             skops->local_port != 55601) {
 42                 skops->reply = -1;
 43                 return 1;
 44         }
 45 
 46         op = (int) skops->op;
 47 
 48 #ifdef DEBUG
 49         bpf_printk("BPF command: %d\n", op);
 50 #endif
 51 
 52         /* Check for TIMEOUT_INIT operation and IPv6 addresses */
 53         if (op == BPF_SOCK_OPS_TIMEOUT_INIT &&
 54                 skops->family == AF_INET6) {
 55 
 56                 /* If the first 5.5 bytes of the IPv6 address are the same
 57                  * then both hosts are in the same datacenter
 58                  * so use an RTO of 10ms
 59                  */
 60                 if (skops->local_ip6[0] == skops->remote_ip6[0] &&
 61                     (bpf_ntohl(skops->local_ip6[1]) & 0xfff00000) ==
 62                     (bpf_ntohl(skops->remote_ip6[1]) & 0xfff00000))
 63                         rv = 10;
 64         }
 65 #ifdef DEBUG
 66         bpf_printk("Returning %d\n", rv);
 67 #endif
 68         skops->reply = rv;
 69         return 1;
 70 }
 71 char _license[] SEC("license") = "GPL";
 72 

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