platform_system_sepolicy/public/net.te

## Network types
type node, node_type;
type netif, netif_type;
type port, port_type;

###
### Domain with network access
###

# Use network sockets.
allow netdomain self:tcp_socket create_stream_socket_perms;
allow netdomain self:{ icmp_socket udp_socket rawip_socket } create_socket_perms;

# Connect to ports.
allow netdomain port_type:tcp_socket name_connect;
# Bind to ports.
allow {netdomain -ephemeral_app} node_type:{ icmp_socket rawip_socket tcp_socket udp_socket } node_bind;
allow {netdomain -ephemeral_app} port_type:udp_socket name_bind;
allow {netdomain -ephemeral_app} port_type:tcp_socket name_bind;
# See changes to the routing table.
allow netdomain self:netlink_route_socket { create read getattr write setattr lock append connect getopt setopt shutdown nlmsg_read };
# b/141455849 gate RTM_GETLINK with a new permission nlmsg_readpriv and block access from
# untrusted_apps. Some untrusted apps (e.g. untrusted_app_25-29) are granted access elsewhere
# to avoid app-compat breakage.
allow {
  netdomain
  -ephemeral_app
  -mediaprovider
  -untrusted_app_all
} self:netlink_route_socket { bind nlmsg_readpriv };

# Talks to netd via dnsproxyd socket.
unix_socket_connect(netdomain, dnsproxyd, netd)

# Talks to netd via fwmarkd socket.
unix_socket_connect(netdomain, fwmarkd, netd)

# Connect to mdnsd via mdnsd socket.
unix_socket_connect(netdomain, mdnsd, mdnsd)