diff options
Diffstat (limited to 'samples/bpf/tracex1_kern.c')
| -rw-r--r-- | samples/bpf/tracex1_kern.c | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/samples/bpf/tracex1_kern.c b/samples/bpf/tracex1_kern.c deleted file mode 100644 index ef30d2b353b0..000000000000 --- a/samples/bpf/tracex1_kern.c +++ /dev/null @@ -1,54 +0,0 @@ -/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com - * - * 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. - */ -#include <linux/skbuff.h> -#include <linux/netdevice.h> -#include <uapi/linux/bpf.h> -#include <linux/version.h> -#include <bpf/bpf_helpers.h> -#include <bpf/bpf_tracing.h> - -#define _(P) \ - ({ \ - typeof(P) val = 0; \ - bpf_probe_read_kernel(&val, sizeof(val), &(P)); \ - val; \ - }) - -/* kprobe is NOT a stable ABI - * kernel functions can be removed, renamed or completely change semantics. - * Number of arguments and their positions can change, etc. - * In such case this bpf+kprobe example will no longer be meaningful - */ -SEC("kprobe/__netif_receive_skb_core") -int bpf_prog1(struct pt_regs *ctx) -{ - /* attaches to kprobe __netif_receive_skb_core, - * looks for packets on loobpack device and prints them - */ - char devname[IFNAMSIZ]; - struct net_device *dev; - struct sk_buff *skb; - int len; - - /* non-portable! works for the given kernel only */ - bpf_probe_read_kernel(&skb, sizeof(skb), (void *)PT_REGS_PARM1(ctx)); - dev = _(skb->dev); - len = _(skb->len); - - bpf_probe_read_kernel(devname, sizeof(devname), dev->name); - - if (devname[0] == 'l' && devname[1] == 'o') { - char fmt[] = "skb %p len %d\n"; - /* using bpf_trace_printk() for DEBUG ONLY */ - bpf_trace_printk(fmt, sizeof(fmt), skb, len); - } - - return 0; -} - -char _license[] SEC("license") = "GPL"; -u32 _version SEC("version") = LINUX_VERSION_CODE; |