1d9c037a89
The test itself is not particularly useful but it encodes a common pattern we have. Namely do a sk storage lookup then depending on data here decide if we need to do more work or alternatively allow packet to PASS. Then if we need to do more work consult task_struct for more information about the running task. Finally based on this additional information drop or pass the data. In this case the suspicious check is not so realisitic but it encodes the general pattern and uses the helpers so we test the workflow. This is a load test to ensure verifier correctly handles this case. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/159033909665.12355.6166415847337547879.stgit@john-Precision-5820-Tower Signed-off-by: Alexei Starovoitov <ast@kernel.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Isovalent, Inc.
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 2);
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__type(key, __u32);
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__type(value, __u64);
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} sock_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKHASH);
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__uint(max_entries, 2);
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__type(key, __u32);
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__type(value, __u64);
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} sock_hash SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, __u32);
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__type(value, __u64);
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} socket_storage SEC(".maps");
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SEC("sk_msg")
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int prog_msg_verdict(struct sk_msg_md *msg)
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{
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struct task_struct *task = (struct task_struct *)bpf_get_current_task();
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int verdict = SK_PASS;
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__u32 pid, tpid;
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__u64 *sk_stg;
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pid = bpf_get_current_pid_tgid() >> 32;
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sk_stg = bpf_sk_storage_get(&socket_storage, msg->sk, 0, BPF_SK_STORAGE_GET_F_CREATE);
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if (!sk_stg)
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return SK_DROP;
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*sk_stg = pid;
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bpf_probe_read_kernel(&tpid , sizeof(tpid), &task->tgid);
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if (pid != tpid)
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verdict = SK_DROP;
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bpf_sk_storage_delete(&socket_storage, (void *)msg->sk);
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return verdict;
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}
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char _license[] SEC("license") = "GPL";
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