/**************************************************************************** * net/ipfilter/ipfilter.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __NET_IPFILTER_IPFILTER_H #define __NET_IPFILTER_IPFILTER_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #ifdef CONFIG_NET_IPFILTER /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define IPFILTER_TARGET_ACCEPT (0) #define IPFILTER_TARGET_DROP (-1) #define IPFILTER_TARGET_REJECT (-2) /**************************************************************************** * Public Types ****************************************************************************/ enum ipfilter_chain_e { IPFILTER_CHAIN_INPUT = 0, /* = NF_IP_LOCAL_IN - 1, Input chain */ IPFILTER_CHAIN_FORWARD = 1, /* = NF_IP_FORWARD - 1, Forward chain */ IPFILTER_CHAIN_OUTPUT = 2, /* = NF_IP_LOCAL_OUT - 1, Output chain */ IPFILTER_CHAIN_MAX }; /* The filter configuration entry */ struct ipfilter_entry_s { FAR struct ipfilter_entry_s *flink; FAR struct net_driver_s *indev; FAR struct net_driver_s *outdev; union /* Matches in host byte order (because it's range) */ { struct { uint16_t sports[2]; /* Source port range */ uint16_t dports[2]; /* Destination port range */ } tcpudp; struct { uint8_t type; /* Type to match, 0xFF = ALL (Same as Linux) */ } icmp; } match; uint8_t proto; /* Protocol to match, 0 = ALL (Same as Linux) */ int8_t target; /* Match flags, whether we need to match protocol in detail */ uint8_t match_tcpudp : 1; /* Match TCP/UDP */ uint8_t match_icmp : 1; /* Match ICMP */ /* Inverse flags */ uint8_t inv_indev : 1; /* Inverse input device */ uint8_t inv_outdev : 1; /* Inverse output device */ uint8_t inv_proto : 1; /* Inverse protocol */ uint8_t inv_srcip : 1; /* Inverse source IP */ uint8_t inv_dstip : 1; /* Inverse destination IP */ uint8_t inv_sport : 1; /* Inverse source port */ uint8_t inv_dport : 1; /* Inverse destination port */ uint8_t inv_icmp : 1; /* Inverse ICMP type */ }; struct ipv4_filter_entry_s { struct ipfilter_entry_s common; /* Addresses in network byte order */ in_addr_t sip; in_addr_t dip; in_addr_t smsk; in_addr_t dmsk; }; struct ipv6_filter_entry_s { struct ipfilter_entry_s common; /* Addresses in network byte order */ net_ipv6addr_t sip; net_ipv6addr_t dip; net_ipv6addr_t smsk; net_ipv6addr_t dmsk; }; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: ipfilter_cfg_alloc * * Description: * Allocate a new filter configuration entry for the given address family. * * Input Parameters: * family - The address family of the filter entry * * Returned Value: * A pointer to the newly allocated filter entry. NULL is returned on * failure. * ****************************************************************************/ FAR struct ipfilter_entry_s *ipfilter_cfg_alloc(sa_family_t family); /**************************************************************************** * Name: ipfilter_cfg_add * * Description: * Add a new filter configuration entry for the given address family to the * end of specified chain. * * Input Parameters: * entry - The filter entry to add * family - The address family of the filter entry * chain - The chain to add the filter entry to * * Returned Value: * None * ****************************************************************************/ void ipfilter_cfg_add(FAR struct ipfilter_entry_s *entry, sa_family_t family, enum ipfilter_chain_e chain); /**************************************************************************** * Name: ipfilter_cfg_clear * * Description: * Clear all filter configuration entries for the given address family from * the specified chain. * * Input Parameters: * family - The address family of the filter entry to clear * chain - The chain to clear the filter entries from * * Returned Value: * None * ****************************************************************************/ void ipfilter_cfg_clear(sa_family_t family, enum ipfilter_chain_e chain); /**************************************************************************** * Name: ipv4_filter_in / ipv6_filter_in * * Description: * Handling IPv4/IPv6 filter on local input. Do nothing if the input * packet is accepted, set d_len to 0 if the input packet needs to be * dropped, and set d_iob to reject reply if the input packet is rejected. * * Input Parameters: * dev - The network device that the packet comes from * * Returned Value: * IPFILTER_TARGET_ACCEPT(0) - The input packet is accepted * IPFILTER_TARGET_DROP(-1) - The input packet needs to be dropped * IPFILTER_TARGET_REJECT(-2) - The input packet is rejected * * Assumptions: * The network is locked. The d_iob and d_len in the dev are set. * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 int ipv4_filter_in(FAR struct net_driver_s *dev); #endif #ifdef CONFIG_NET_IPv6 int ipv6_filter_in(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: ipfilter_out * * Description: * Handling filter on local output. Do nothing if the output packet * is accepted, set d_len to 0 if the output packet needs to be dropped, * and set d_iob to reject reply if the output packet is rejected. * * Input Parameters: * dev - The network device that the packet goes to * * Returned Value: * None * * Assumptions: * The network is locked. Only IPv4 and IPv6 packets call this function. * ****************************************************************************/ void ipfilter_out(FAR struct net_driver_s *dev); /**************************************************************************** * Name: ipv4_filter_fwd / ipv6_filter_fwd * * Description: * Handling IPv4/IPv6 filter on forwarding. Just return the target action, * and relies on the caller to do the actual drop / reject. * * Input Parameters: * indev - The network device that the packet comes from * outdev - The network device that the packet goes to * ipv4/ipv6 - The IPv4/IPv6 header * * Returned Value: * IPFILTER_TARGET_ACCEPT(0) - The input packet is accepted * IPFILTER_TARGET_DROP(-1) - The input packet needs to be dropped * IPFILTER_TARGET_REJECT(-2) - The input packet needs to be rejected * * Assumptions: * The network is locked. * ****************************************************************************/ #if defined(CONFIG_NET_IPFORWARD) && defined(CONFIG_NET_IPv4) int ipv4_filter_fwd(FAR struct net_driver_s *indev, FAR struct net_driver_s *outdev, FAR struct ipv4_hdr_s *ipv4); #endif #if defined(CONFIG_NET_IPFORWARD) && defined(CONFIG_NET_IPv6) int ipv6_filter_fwd(FAR struct net_driver_s *indev, FAR struct net_driver_s *outdev, FAR struct ipv6_hdr_s *ipv6); #endif #endif /* CONFIG_NET_IPFILTER */ #endif /* __NET_IPFILTER_IPFILTER_H */