mirror/xdp-project-bpf-examples
1
0
Fork 0
mirror of https://github.com/xdp-project/bpf-examples.git synced 2024-05-06 15:54:53 +00:00
Code Issues Projects Releases Wiki Activity

pping: Add TC-BPF program for egress

Browse Source 
Split and rename files so there is one userspace program (pping) and
two kernel-space ones (one for XDP and one for TC-BPF).

Copy the shell script for loading the TC-BPF program from
traffic-pacing-edt folder, but add support for loading a specific
section.

The XDP and TC-BPF programs do not share the ts_start map, so program
does not work.

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
This commit is contained in:
Simon Sundberg
2021-01-07 18:30:53 +01:00
parent 45b138b6ab
commit 954c66b0e8
10 changed files with 471 additions and 149 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
pping/pping_helpers.h Normal file
View File

@@ -0,0 +1,58 @@
#ifndef PPING_HELPERS_H
#define PPING_HELPERS_H
#include "pping.h"
#define MAX_TCP_OPTIONS 10
static __always_inline int fill_ipv4_flow(struct ipv4_flow *flow, __u32 saddr, __u32 daddr, __u16 sport, __u16 dport)
{
flow->saddr = saddr;
flow->daddr = daddr;
flow->sport = sport;
flow->dport = dport;
return 0;
}
// Parses the TSval and TSecr values from the TCP options field - returns 0 if sucessful and -1 on failure
// If sucessful the TSval and TSecr values will be stored at tsval and tsecr (in network byte order!)
static __always_inline int parse_tcp_ts(struct tcphdr *tcph, void *data_end, __u32 *tsval, __u32 *tsecr)
{
if (tcph + 1 > data_end) // To hopefully please verifier
return -1;
int len = tcph->doff << 2;
if (len <= sizeof(struct tcphdr)) // No TCP options
return -1;
void *pos = (void *)(tcph + 1);
void *opt_end = ((void *)tcph + len);
__u8 i, opt, opt_size;
#pragma unroll
for (i = 0; i < MAX_TCP_OPTIONS; i++) {
if (pos+1 > opt_end || pos+1 > data_end)
return -1;
opt = *(__u8 *)pos; // Save value to variable so I don't have to perform any more data_end checks on the option kind
if (opt == 0) // Reached end of TCP options
return -1;
if (opt == 1) {// TCP NOP option - advance one byte
pos++;
continue;
}
// Option > 1, should have option size
if (pos+2 > opt_end || pos+2 > data_end)
return -1;
opt_size = *(__u8 *)(pos+1); // Save value to variable so I don't have to perform any more data_end checks on option size
if (opt == 8 && opt_size == 10) { // Option-kind is TCP timestap (yey!)
if (pos + opt_size > opt_end || pos + opt_size > data_end)
return -1;
*tsval = *(__u32 *)(pos + 2);
*tsecr = *(__u32 *)(pos + 6);
return 0;
}
// Some other TCP option - advance option-length bytes
pos += opt_size;
}
return -1;
}
#endif