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Linux/samples/bpf/tcp_basertt_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 base_rtt to 80us when host is running TCP-NV and
  8  * both hosts are in the same datacenter (as determined by IPv6 prefix).
  9  *
 10  * Use load_sock_ops to load this BPF program.
 11  */
 12 
 13 #include <uapi/linux/bpf.h>
 14 #include <uapi/linux/tcp.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_basertt(struct bpf_sock_ops *skops)
 33 {
 34         char cong[20];
 35         char nv[] = "nv";
 36         int rv = 0, n;
 37         int op;
 38 
 39         op = (int) skops->op;
 40 
 41 #ifdef DEBUG
 42         bpf_printk("BPF command: %d\n", op);
 43 #endif
 44 
 45         /* Check if both hosts are in the same datacenter. For this
 46          * example they are if the 1st 5.5 bytes in the IPv6 address
 47          * are the same.
 48          */
 49         if (skops->family == AF_INET6 &&
 50             skops->local_ip6[0] == skops->remote_ip6[0] &&
 51             (bpf_ntohl(skops->local_ip6[1]) & 0xfff00000) ==
 52             (bpf_ntohl(skops->remote_ip6[1]) & 0xfff00000)) {
 53                 switch (op) {
 54                 case BPF_SOCK_OPS_BASE_RTT:
 55                         n = bpf_getsockopt(skops, SOL_TCP, TCP_CONGESTION,
 56                                            cong, sizeof(cong));
 57                         if (!n && !__builtin_memcmp(cong, nv, sizeof(nv)+1)) {
 58                                 /* Set base_rtt to 80us */
 59                                 rv = 80;
 60                         } else if (n) {
 61                                 rv = n;
 62                         } else {
 63                                 rv = -1;
 64                         }
 65                         break;
 66                 default:
 67                         rv = -1;
 68                 }
 69         } else {
 70                 rv = -1;
 71         }
 72 #ifdef DEBUG
 73         bpf_printk("Returning %d\n", rv);
 74 #endif
 75         skops->reply = rv;
 76         return 1;
 77 }
 78 char _license[] SEC("license") = "GPL";
 79 

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