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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "bpf_kfuncs.h"
struct {
__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, long);
} enter_id SEC(".maps");
#define IFNAMSIZ 16
int ifindex, ingress_ifindex;
char name[IFNAMSIZ];
unsigned int inum;
unsigned int meta_len, frag0_len, kskb_len, kskb2_len;
SEC("?xdp")
int md_xdp(struct xdp_md *ctx)
{
struct xdp_buff *kctx = bpf_cast_to_kern_ctx(ctx);
struct net_device *dev;
dev = kctx->rxq->dev;
ifindex = dev->ifindex;
inum = dev->nd_net.net->ns.inum;
__builtin_memcpy(name, dev->name, IFNAMSIZ);
ingress_ifindex = ctx->ingress_ifindex;
return XDP_PASS;
}
SEC("?tc")
int md_skb(struct __sk_buff *skb)
{
struct sk_buff *kskb = bpf_cast_to_kern_ctx(skb);
struct skb_shared_info *shared_info;
struct sk_buff *kskb2;
kskb_len = kskb->len;
/* Simulate the following kernel macro:
* #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
*/
shared_info = bpf_core_cast(kskb->head + kskb->end, struct skb_shared_info);
meta_len = shared_info->meta_len;
frag0_len = shared_info->frag_list->len;
/* kskb2 should be equal to kskb */
kskb2 = bpf_core_cast(kskb, typeof(*kskb2));
kskb2_len = kskb2->len;
return 0;
}
SEC("?tp_btf/sys_enter")
int BPF_PROG(untrusted_ptr, struct pt_regs *regs, long id)
{
struct task_struct *task, *task_dup;
task = bpf_get_current_task_btf();
task_dup = bpf_core_cast(task, struct task_struct);
(void)bpf_task_storage_get(&enter_id, task_dup, 0, 0);
return 0;
}
SEC("?tracepoint/syscalls/sys_enter_nanosleep")
int kctx_u64(void *ctx)
{
u64 *kctx = bpf_core_cast(ctx, u64);
(void)kctx;
return 0;
}
char _license[] SEC("license") = "GPL";
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