晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/usr/share/doc/nftables/examples/secmark.nft
#!/usr/sbin/nft -f

# This example file shows how to use secmark labels with the nftables framework.
# This script is meant to be loaded with `nft -f <file>`
# You require linux kernel >= 4.20 and nft >= 0.9.3
# This example is SELinux based, for the secmark objects you require
# SELinux enabled and a SELinux policy defining the stated contexts
# For up-to-date information please visit https://wiki.nftables.org


flush ruleset

table inet x {
	secmark ssh_server {
		"system_u:object_r:ssh_server_packet_t:s0"
	}

	secmark dns_client {
		"system_u:object_r:dns_client_packet_t:s0"
	}

	secmark http_client {
		"system_u:object_r:http_client_packet_t:s0"
	}

	secmark https_client {
		"system_u:object_r:http_client_packet_t:s0"
	}

	secmark ntp_client {
		"system_u:object_r:ntp_client_packet_t:s0"
	}

	secmark icmp_client {
		"system_u:object_r:icmp_client_packet_t:s0"
	}

	secmark icmp_server {
		"system_u:object_r:icmp_server_packet_t:s0"
	}

	secmark ssh_client {
		"system_u:object_r:ssh_client_packet_t:s0"
	}

	secmark git_client {
		"system_u:object_r:git_client_packet_t:s0"
	}

	map secmapping_in {
		type inet_service : secmark
		elements = { 22 : "ssh_server" }
	}

	map secmapping_out {
		type inet_service : secmark
		elements = { 22 : "ssh_client", 53 : "dns_client", 80 : "http_client", 123 : "ntp_client", 443 : "http_client", 9418 : "git_client" }
	}

	chain y {
		type filter hook input priority -225;

		# label new incoming packets and add to connection
		ct state new meta secmark set tcp dport map @secmapping_in
		ct state new meta secmark set udp dport map @secmapping_in
		ct state new ip protocol icmp meta secmark set "icmp_server"
		ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_server"
		ct state new ct secmark set meta secmark

		# set label for est/rel packets from connection
		ct state established,related meta secmark set ct secmark
	}

	chain z {
		type filter hook output priority 225;

		# label new outgoing packets and add to connection
		ct state new meta secmark set tcp dport map @secmapping_out
		ct state new meta secmark set udp dport map @secmapping_out
		ct state new ip protocol icmp meta secmark set "icmp_client"
		ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_client"
		ct state new ct secmark set meta secmark

		# set label for est/rel packets from connection
		ct state established,related meta secmark set ct secmark
	}
}

haha - 2025