static void bpf_parse(struct xt_option_call *cb)
{
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_BCODE_STDIN:
bpf_parse_string(cb, cb->arg, ',');
break;
default:
xtables_error(PARAMETER_PROBLEM, "bpf: unknown option");
}
}
int bpf_parse_ops(int argc, char **argv, struct sock_filter *bpf_ops,
bool from_file)
{
char *bpf_string, *token, separator = ',';
int ret = 0, i = 0;
bool need_release;
__u16 bpf_len = 0;
if (argc < 1)
return -EINVAL;
if (bpf_parse_string(argv[0], from_file, &bpf_len, &bpf_string,
&need_release, separator))
return -EINVAL;
if (bpf_len == 0 || bpf_len > BPF_MAXINSNS) {
ret = -EINVAL;
goto out;
}
token = bpf_string;
while ((token = strchr(token, separator)) && (++token)[0]) {
if (i >= bpf_len) {
fprintf(stderr, "Real program length exceeds encoded "
"length parameter!\n");
ret = -EINVAL;
goto out;
}
if (sscanf(token, "%hu %hhu %hhu %u,",
&bpf_ops[i].code, &bpf_ops[i].jt,
&bpf_ops[i].jf, &bpf_ops[i].k) != 4) {
fprintf(stderr, "Error at instruction %d!\n", i);
ret = -EINVAL;
goto out;
}
i++;
}
if (i != bpf_len) {
fprintf(stderr, "Parsed program length is less than encoded"
"length parameter!\n");
ret = -EINVAL;
goto out;
}
ret = bpf_len;
out:
if (need_release)
free(bpf_string);
return ret;
}