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210e843aab
BPF_MAP_TYPE_PERCPU_ARRAY was introduced in kernel version 4.6, so with latest changes to intercept processes we lost support for older kernels < 4.6. Now we work again for example on kernels 4.4.
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#ifndef OPENSNITCH_COMMON_H
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#define OPENSNITCH_COMMON_H
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#include "common_defs.h"
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//https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/limits.h#L13
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#ifndef MAX_PATH_LEN
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#define MAX_PATH_LEN 4096
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#endif
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//https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/binfmts.h#L16
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#define MAX_CMDLINE_LEN 4096
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// max args that I've been able to use before hitting the error:
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// "dereference of modified ctx ptr disallowed"
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#define MAX_ARGS 20
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#define MAX_ARG_SIZE 256
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// flags to indicate if we were able to read all the cmdline arguments,
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// or if one of the arguments is >= MAX_ARG_SIZE, or there more than MAX_ARGS
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#define COMPLETE_ARGS 0
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#define INCOMPLETE_ARGS 1
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#ifndef TASK_COMM_LEN
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#define TASK_COMM_LEN 16
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#endif
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#define BUF_SIZE_MAP_NS 256
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#define GLOBAL_MAP_NS "256"
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enum events_type {
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EVENT_NONE = 0,
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EVENT_EXEC,
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EVENT_EXECVEAT,
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EVENT_FORK,
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EVENT_SCHED_EXIT,
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};
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struct data_t {
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u64 type;
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u64 pid; // PID as in the userspace term (i.e. task->tgid in kernel)
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u64 ppid; // Parent PID as in the userspace term (i.e task->real_parent->tgid in kernel)
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u64 uid;
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u64 args_count;
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u64 args_partial;
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char filename[MAX_PATH_LEN];
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char args[MAX_ARGS][MAX_ARG_SIZE];
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char comm[TASK_COMM_LEN];
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}__attribute__((packed));
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//-----------------------------------------------------------------------------
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// maps
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struct bpf_map_def SEC("maps/heapstore") heapstore = {
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.type = BPF_MAP_TYPE_PERCPU_ARRAY,
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.key_size = sizeof(u32),
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.value_size = sizeof(struct data_t),
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.max_entries = 1
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};
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#endif
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