下面的 C 代码等价于下面的 iptables 命令:
ip6tables -A OUTPUT -t mangle -s 2001:db8:222:2::/64 -j MARK --set-mark 20
但是, iptables 命令在命令行中运行良好,但是当我执行代码时它给出了错误
Error commit: Protocol wrong type for socket
虽然编译成功。我也尝试过设置 DSCP 值并且效果很好,所以我猜 MARK 模块缺少一些东西
Linux 内核 3.8.2
iptables 1.4.12 版(我也试过 1.4.21 但没用)
编码
struct ip6tc_handle *h;
const ip6t_chainlabel chain = "OUTPUT";
const char *tablename = "mangle";
struct ip6t_entry * e;
struct ip6t_entry_target * target;
struct xt_mark_tginfo2 *pmark;
unsigned int size_ip6t_entry, size_ip6t_entry_target, size_pmark, total_length;
size_ip6t_entry = XT_ALIGN(sizeof(struct ip6t_entry));
size_ip6t_entry_target = XT_ALIGN(sizeof(struct ip6t_entry_target));
size_pmark = XT_ALIGN(sizeof(struct xt_mark_tginfo2));
total_length = size_ip6t_entry + size_ip6t_entry_target + size_pmark ;
e = calloc(1, total_length);
if(e == NULL)
{
printf("malloc failure");
exit(1);
}
//offsets to the other bits:
//target struct begining
e->target_offset = size_ip6t_entry ;
//next "e" struct, end of the current one
e->next_offset = total_length;
char *temps = malloc(128);
temps = "2001:db8:222:2::";
inet_pton(AF_INET6, temps, &e->ipv6.src);
char *temps2 = malloc(128);
temps2 = "FFFF:FFFF:FFFF:FFFF::";
inet_pton(AF_INET6, temps2, &e->ipv6.smsk);
//e->ipv6.proto = 58 ;
//strcpy(e->ipv6.iniface, "wlan1");
//target struct
target = (struct ip6t_entry_target *) e->elems;
target->u.target_size = size_ip6t_entry_target;
strcpy(target->u.user.name, "MARK");
pmark = (struct xt_mark_tginfo2 *) target->data;
pmark->mark = 0x14;
pmark->mask = 0xff;
h = ip6tc_init(tablename);
if ( !h )
{
printf("Error initializing: %s\n", iptc_strerror(errno));
exit(errno);
}
int x = ip6tc_append_entry(chain, e, h);
if (!x)
{
printf("Error append_entry: %s\n", iptc_strerror(errno));
exit(errno);
}
printf("%s", target->data);
int y = ip6tc_commit(h);
if (!y)
{
printf("Error commit: %s\n", iptc_strerror(errno));
exit(errno);
}
exit(0);
有任何想法吗?
谢谢
最佳答案
迟到的回复,但想给潜在的求职者一个提示。
一些目标(也匹配)需要设置正确的版本,对于 xt_mark_tginfo2 我看到它必须是 1 或 2。
另一件事是条目(ip6t_entry)标志,例如
我一直在努力拒绝目标(ip6t_reject_info),后来我才发现必须将入口标志设置为 IP6T_F_PROTO。
我不完全确定,但也许可以从 xtables_target 结构中查看 .family 。
祝 iptc 图书馆战士好运;)
关于c - 执行 iptables 代码时出错 “Error commit: Protocol wrong type for socket”,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23803128/