// SPDX-License-Identifier: GPL-2.0 | |
#define _GNU_SOURCE | |
#include <sys/uio.h> | |
#include <errno.h> | |
#include <stdio.h> | |
#include <sys/socket.h> | |
#include <fcntl.h> | |
#include <unistd.h> | |
#include "../../include/uapi/linux/bpf.h" | |
#include <asm/unistd.h> | |
#include "msgfmt.h" | |
FILE *debug_f; | |
static int handle_get_cmd(struct mbox_request *cmd) | |
{ | |
switch (cmd->cmd) { | |
case 0: | |
return 0; | |
default: | |
break; | |
} | |
return -ENOPROTOOPT; | |
} | |
static int handle_set_cmd(struct mbox_request *cmd) | |
{ | |
return -ENOPROTOOPT; | |
} | |
static void loop(void) | |
{ | |
while (1) { | |
struct mbox_request req; | |
struct mbox_reply reply; | |
int n; | |
n = read(0, &req, sizeof(req)); | |
if (n != sizeof(req)) { | |
fprintf(debug_f, "invalid request %d\n", n); | |
return; | |
} | |
reply.status = req.is_set ? | |
handle_set_cmd(&req) : | |
handle_get_cmd(&req); | |
n = write(1, &reply, sizeof(reply)); | |
if (n != sizeof(reply)) { | |
fprintf(debug_f, "reply failed %d\n", n); | |
return; | |
} | |
} | |
} | |
int main(void) | |
{ | |
debug_f = fopen("/dev/kmsg", "w"); | |
setvbuf(debug_f, 0, _IOLBF, 0); | |
fprintf(debug_f, "Started bpfilter\n"); | |
loop(); | |
fclose(debug_f); | |
return 0; | |
} |