f7181676b7
Add a firewall compatible with Linux's iptables and ip6tables, with chains at similar points in the packet processing path.
NIC ─> ipv[46]_input ┬> ipv[46]_forward ─> [FORWARD] ┬> devif_poll_out ─> NIC
│ │
│ ┌> tcp ┐ │
│ ├> udp ┤ │
└> [INPUT] ┼> icmp ┼> [OUTPUT] ┘
├> icmp6 ┤
└> ... ┘
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
655 lines
19 KiB
C
655 lines
19 KiB
C
/****************************************************************************
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* net/devif/ipv6_input.c
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* Device driver IPv6 packet receipt interface
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET_IPv6
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#include <sys/ioctl.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <string.h>
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#include <net/if.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/ipv6ext.h>
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#include "neighbor/neighbor.h"
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#include "tcp/tcp.h"
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#include "udp/udp.h"
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#include "sixlowpan/sixlowpan.h"
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#include "pkt/pkt.h"
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#include "icmpv6/icmpv6.h"
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#include "nat/nat.h"
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#include "netdev/netdev.h"
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#include "ipforward/ipforward.h"
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#include "inet/inet.h"
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#include "devif/devif.h"
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#include "ipfilter/ipfilter.h"
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#include "ipfrag/ipfrag.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: check_dev_destipaddr
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*
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* Description:
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* Check if the destination address in the IPv6 is destined for the
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* provided network device.
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*
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* Returned Value:
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* 1 - This packet is destined for this network device
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* 0 - This packet is NOT destined for this network device
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*
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****************************************************************************/
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static int check_dev_destipaddr(FAR struct net_driver_s *dev, FAR void *arg)
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{
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FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)arg;
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/* Check if the IPv6 destination address matches the IPv6 address assigned
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* to this device.
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*/
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if (NETDEV_IS_MY_V6ADDR(dev, ipv6->destipaddr))
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{
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return 1;
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}
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/* No match, return 0 to keep searching */
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return 0;
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}
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/****************************************************************************
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* Name: check_destipaddr
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*
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* Description:
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* Check if the destination address in the IPv6 is destined for us. This
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* is typically just a comparison the of the IPv6 destination address in
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* the IPv6 packet with the IPv6 address assigned to the receiving device.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv6 packet.
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* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
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* packet
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*
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* Returned Value:
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* true - This packet is destined for us
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* false - This packet is NOT destined for us and may need to be forwarded.
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*
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****************************************************************************/
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static bool check_destipaddr(FAR struct net_driver_s *dev,
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FAR struct ipv6_hdr_s *ipv6)
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{
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int ret;
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/* For IPv6, packet reception is a little trickier as we need to make sure
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* that we listen to certain multicast addresses (all hosts multicast
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* address, and the solicited-node multicast address) as well. However,
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* we will cheat here and accept all multicast packets that are sent to
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* the ff02::/16 addresses.
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*/
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if (ipv6->destipaddr[0] == HTONS(0xff02))
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{
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#ifdef CONFIG_NET_IPFORWARD_BROADCAST
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/* Forward multicast packets */
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ipv6_forward_broadcast(dev, ipv6);
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#endif
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return true;
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}
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/* We will also allow for a perverse case where we receive a packet
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* addressed to us, but on a different device. Can that really happen?
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*/
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ret = netdev_foreach(check_dev_destipaddr, ipv6);
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if (ret == 1)
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{
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/* The traversal of the network devices will return 0 if there is
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* no network device with that address or 1 if there is a network
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* device with such an address.
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*/
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return true;
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}
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return false;
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}
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/****************************************************************************
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* Name: ipv6_in
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*
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* Description:
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* Receive an IPv6 packet from the network device. Verify and forward to
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* L3 packet handling logic if the packet is destined for us.
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*
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* This is the iob buffer version of ipv6_input(),
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* this function will support send/receive iob vectors directly between
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* the driver and l3/l4 stack to avoid unnecessary memory copies,
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* especially on hardware that supports Scatter/gather, which can
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* greatly improve performance
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* this function will uses d_iob as packets input which used by some
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* NICs such as celluler net driver.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv6 packet.
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* Returned Value:
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* OK - The packet was processed (or dropped) and can be discarded.
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* ERROR - Hold the packet and try again later. There is a listening
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* socket but no receive in place to catch the packet yet. The
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* device's d_len will be set to zero in this case as there is
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* no outgoing data.
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*
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* If this function returns to the network driver with dev->d_len > 0,
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* that is an indication to the driver that there is an outgoing response
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* to this input.
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static int ipv6_in(FAR struct net_driver_s *dev)
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{
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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR uint8_t *payload;
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uint16_t iphdrlen;
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uint16_t paylen;
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uint8_t nxthdr;
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#ifdef CONFIG_NET_IPFORWARD
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int ret;
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#endif
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#ifdef CONFIG_NET_IPFRAG
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bool isfrag = false;
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#endif
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/* This is where the input processing starts. */
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.ipv6.recv++;
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#endif
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/* Start of IP input header processing code.
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*
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* Check validity of the IP header.
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*/
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if ((ipv6->vtc & 0xf0) != 0x60)
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{
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/* IP version and header length. */
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nwarn("WARNING: Invalid IPv6 version: %d\n", ipv6->vtc >> 4);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.ipv6.vhlerr++;
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#endif
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goto drop;
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}
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/* Get the size of the packet minus the size of link layer header */
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if (IPv6_HDRLEN > dev->d_len)
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{
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nwarn("WARNING: Packet shorter than IPv6 header\n");
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goto drop;
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}
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/* Make sure that all packet processing logic knows that there is an IPv6
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* packet in the device buffer.
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*/
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IFF_SET_IPv6(dev->d_flags);
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/* Check the size of the packet. If the size reported to us in d_len is
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* smaller the size reported in the IP header, we assume that the packet
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* has been corrupted in transit. If the size of d_len is larger than the
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* size reported in the IP packet header, the packet has been padded and
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* we set d_len to the correct value.
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*
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* The length reported in the IPv6 header is the length of the payload
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* that follows the header. The device interface uses the d_len variable
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* for holding the size of the entire packet, including the IP header but
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* without the link layer header (subtracted out above).
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*
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* NOTE: The payload length in the includes the size of the Ipv6 extension
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* options, but not the size of the IPv6 header.
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*
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* REVISIT: Length will be set to zero if the extension header carries
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* a Jumbo payload option.
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*/
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paylen = ((uint16_t)ipv6->len[0] << 8) + (uint16_t)ipv6->len[1] +
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IPv6_HDRLEN;
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if (paylen < dev->d_len)
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{
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iob_update_pktlen(dev->d_iob, paylen, false);
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dev->d_len = paylen;
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}
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else if (paylen > dev->d_len)
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{
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nwarn("WARNING: IP packet shorter than length in IP header\n");
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goto drop;
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}
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/* Parse IPv6 extension headers (parsed but ignored) */
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payload = IPBUF(IPv6_HDRLEN); /* Assume payload starts right after IPv6 header */
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iphdrlen = IPv6_HDRLEN; /* Total length of the IPv6 header */
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nxthdr = ipv6->proto; /* Next header determined by IPv6 header prototype */
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while (ipv6_exthdr(nxthdr))
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{
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FAR struct ipv6_extension_s *exthdr;
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uint16_t extlen;
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/* Just skip over the extension header */
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exthdr = (FAR struct ipv6_extension_s *)payload;
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if (nxthdr == NEXT_FRAGMENT_EH)
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{
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extlen = EXTHDR_FRAG_LEN;
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#ifdef CONFIG_NET_IPFRAG
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isfrag = true;
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#endif
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}
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else
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{
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extlen = EXTHDR_LEN((unsigned int)exthdr->len);
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}
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payload += extlen;
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iphdrlen += extlen;
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nxthdr = exthdr->nxthdr;
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}
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#ifdef CONFIG_NET_NAT66
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/* Try NAT inbound, rule matching will be performed in NAT module. */
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ipv6_nat_inbound(dev, ipv6);
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#endif
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#ifdef CONFIG_NET_BROADCAST
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/* Check for a multicast packet, which may be destined to us (even if
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* there is no IP address yet assigned to the device). We only expect
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* multicast packets destined for sockets that have joined a multicast
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* group or for ICMPv6 Autoconfiguration and Neighbor discovery or ICMPv6
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* MLD packets.
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*
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* We should actually pick off certain multicast address (all hosts
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* multicast address, and the solicited-node multicast address). We
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* will cheat here and accept all multicast packets that are sent to the
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* ff00::/8 addresses (see net_is_addr_mcast).
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*/
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if (net_is_addr_mcast(ipv6->destipaddr))
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{
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#ifdef CONFIG_NET_IPFORWARD_BROADCAST
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/* Packets sent to ffx0 are reserved, ffx1 are interface-local, and
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* ffx2 are interface-local, and therefore, should not be forwarded
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*/
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if (((ipv6->destipaddr[0] & HTONS(0xff0f)) != HTONS(0xff00)) &&
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((ipv6->destipaddr[0] & HTONS(0xff0f)) != HTONS(0xff01)) &&
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((ipv6->destipaddr[0] & HTONS(0xff0f)) != HTONS(0xff02)))
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{
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/* Forward broadcast packets */
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ipv6_forward_broadcast(dev, ipv6);
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}
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#endif
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/* Fall through with no further address checks and handle the multicast
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* address by its IPv6 nexthdr field.
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*/
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}
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else
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#endif
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{
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/* Check if the packet is destined for us. */
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if (!check_destipaddr(dev, ipv6))
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{
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#ifdef CONFIG_NET_IPFORWARD
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/* Not destined for us, try to forward the packet */
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ret = ipv6_forward(dev, ipv6);
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if (ret >= 0)
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{
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/* The packet was forwarded. Return success; d_len will
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* be set appropriately by the forwarding logic: Cleared
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* if the packet is forward via another device or non-
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* zero if it will be forwarded by the same device that
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* it was received on.
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*/
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goto done;
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}
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else
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#endif
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#if defined(NET_UDP_HAVE_STACK) && defined(CONFIG_NET_BINDTODEVICE)
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/* If the protocol specific socket option NET_BINDTODEVICE
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* is selected, then we must forward all UDP packets to the bound
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* socket.
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*/
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if (nxthdr != IP_PROTO_UDP)
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#endif
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{
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/* Not destined for us and not forwardable...
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* drop the packet.
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*/
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ninfo("WARNING: Not destined for us... Dropping!\n");
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goto drop;
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}
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}
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}
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#ifdef CONFIG_NET_IPFORWARD
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/* Return success if the packet was forwarded. */
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if (dev->d_len == 0)
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{
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goto done;
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}
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#endif
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#ifdef CONFIG_NET_ICMPv6
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/* In other cases, the device must be assigned a non-zero IP address
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* (the all zero address is the "unspecified" address.
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*/
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if (!NETDEV_HAS_V6ADDR(dev))
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{
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nwarn("WARNING: No IP address assigned\n");
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goto drop;
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}
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#endif
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#ifdef CONFIG_NET_IPFRAG
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if (isfrag)
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{
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if (ipv6_fragin(dev) == OK)
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{
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return OK;
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}
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else
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{
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.ipv6.fragerr++;
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#endif
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goto drop;
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}
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}
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#endif
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#ifdef CONFIG_NET_IPFILTER
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if (ipv6_filter_in(dev) != IPFILTER_TARGET_ACCEPT)
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{
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ninfo("Drop/Reject INPUT packet due to filter.\n");
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goto done;
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}
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#endif
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/* Now process the incoming packet according to the protocol specified in
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* the next header IPv6 field.
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*/
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switch (nxthdr)
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{
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#ifdef NET_TCP_HAVE_STACK
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case IP_PROTO_TCP: /* TCP input */
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/* Forward the IPv6 TCP packet */
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tcp_ipv6_input(dev, iphdrlen);
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#ifdef CONFIG_NET_6LOWPAN
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/* TCP output comes through three different mechanisms. Either from:
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*
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* 1. TCP socket output. For the case of TCP output to an
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* IEEE802.15.4, the TCP output is caught in the socket
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* send()/sendto() logic and and redirected to 6LoWPAN logic.
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* 2. TCP output from the TCP state machine. That will occur
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* during TCP packet processing by the TCP state machine.
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* 3. TCP output resulting from TX or timer polling
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*
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* Case 3 is handled here. Logic here detects if (1) an attempt
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* to return with d_len > 0 and (2) that the device is an
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* IEEE802.15.4 MAC network driver. Under those conditions, 6LoWPAN
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* logic will be called to create the IEEE80215.4 frames.
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*/
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if (dev->d_len > 0 && dev->d_lltype == CONFIG_NET_6LOWPAN)
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{
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/* Let 6LoWPAN handle the TCP output */
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sixlowpan_tcp_send(dev, dev, ipv6);
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/* Drop the packet in the d_buf */
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goto drop;
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}
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#endif /* CONFIG_NET_6LOWPAN */
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break;
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#endif /* NET_TCP_HAVE_STACK */
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#ifdef NET_UDP_HAVE_STACK
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case IP_PROTO_UDP: /* UDP input */
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/* Forward the IPv6 UDP packet */
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udp_ipv6_input(dev, iphdrlen);
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break;
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#endif
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/* Check for ICMP input */
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#ifdef NET_ICMPv6_HAVE_STACK
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case IP_PROTO_ICMP6: /* ICMP6 input */
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/* Forward the ICMPv6 packet */
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icmpv6_input(dev, iphdrlen);
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#ifdef CONFIG_NET_6LOWPAN
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/* All outgoing ICMPv6 messages come through one of two mechanisms:
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*
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* 1. The output from internal ICMPv6 message passing. These
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* outgoing messages will use device polling and will be
|
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* handled elsewhere.
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* 2. ICMPv6 output resulting from TX or timer polling.
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*
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* Case 2 is handled here. Logic here detects if (1) an attempt
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* to return with d_len > 0 and (2) that the device is an
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* IEEE802.15.4 MAC network driver. Under those conditions, 6LoWPAN
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* logic will be called to create the IEEE80215.4 frames.
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*/
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if (dev->d_len > 0 && dev->d_lltype == CONFIG_NET_6LOWPAN)
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{
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/* Let 6LoWPAN handle the ICMPv6 output */
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sixlowpan_icmpv6_send(dev, dev, ipv6);
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/* Drop the packet in the d_buf */
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goto drop;
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}
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#endif /* CONFIG_NET_6LOWPAN */
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break;
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#endif /* NET_ICMPv6_HAVE_STACK */
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default: /* Unrecognized/unsupported protocol */
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nwarn("WARNING: Unrecognized IP protocol: %04x\n", ipv6->proto);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.ipv6.protoerr++;
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#endif
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goto drop;
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}
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#ifdef CONFIG_NET_IPFILTER
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ipfilter_out(dev);
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#endif
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#if defined(CONFIG_NET_IPFORWARD) || defined(CONFIG_NET_IPFILTER)
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done:
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|
#endif
|
|
|
|
#ifdef CONFIG_NET_IPFRAG
|
|
ip_fragout(dev);
|
|
#endif
|
|
|
|
devif_out(dev);
|
|
|
|
/* Return and let the caller do any pending transmission. */
|
|
|
|
return OK;
|
|
|
|
/* Drop the packet. NOTE that OK is returned meaning that the
|
|
* packet has been processed (although processed unsuccessfully).
|
|
*/
|
|
|
|
drop:
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
g_netstats.ipv6.drop++;
|
|
#endif
|
|
dev->d_len = 0;
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: ipv6_exthdr
|
|
*
|
|
* Description:
|
|
* Check whether it is an IPv6 extension header.
|
|
*
|
|
* Input Parameters:
|
|
* The next header value extracted from an IPv6 frame.
|
|
*
|
|
* Returned Value:
|
|
* Return true if the next header value is an IPv6 extension header.
|
|
*
|
|
****************************************************************************/
|
|
|
|
bool ipv6_exthdr(uint8_t nxthdr)
|
|
{
|
|
switch (nxthdr)
|
|
{
|
|
case NEXT_HOPBYBOT_EH: /* Hop-by-Hop Options Header */
|
|
case NEXT_ENCAP_EH: /* Encapsulated IPv6 Header */
|
|
case NEXT_ROUTING_EH: /* Routing Header */
|
|
case NEXT_FRAGMENT_EH: /* Fragment Header */
|
|
case NEXT_RRSVP_EH: /* Resource ReSerVation Protocol */
|
|
case NEXT_ENCAPSEC_EH: /* Encapsulating Security Payload */
|
|
case NEXT_AUTH_EH: /* Authentication Header */
|
|
case NEXT_DESTOPT_EH: /* Destination Options Header */
|
|
case NEXT_MOBILITY_EH: /* Mobility */
|
|
case NEXT_HOSTID_EH: /* Host Identity Protocol */
|
|
case NEXT_SHIM6_EH: /* Shim6 Protocol */
|
|
return true;
|
|
|
|
case NEXT_NOHEADER: /* No next header */
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: ipv6_input
|
|
*
|
|
* Description:
|
|
* Receive an IPv6 packet from the network device. Verify and forward to
|
|
* L3 packet handling logic if the packet is destined for us.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device on which the packet was received and which contains
|
|
* the IPv6 packet.
|
|
* Returned Value:
|
|
* OK - The packet was processed (or dropped) and can be discarded.
|
|
* ERROR - Hold the packet and try again later. There is a listening
|
|
* socket but no receive in place to catch the packet yet. The
|
|
* device's d_len will be set to zero in this case as there is
|
|
* no outgoing data.
|
|
*
|
|
* If this function returns to the network driver with dev->d_len > 0,
|
|
* that is an indication to the driver that there is an outgoing response
|
|
* to this input.
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int ipv6_input(FAR struct net_driver_s *dev)
|
|
{
|
|
FAR uint8_t *buf;
|
|
int ret;
|
|
|
|
/* Store reception timestamp if enabled and not provided by hardware. */
|
|
|
|
#if defined(CONFIG_NET_TIMESTAMP) && !defined(CONFIG_ARCH_HAVE_NETDEV_TIMESTAMP)
|
|
clock_gettime(CLOCK_REALTIME, &dev->d_rxtime);
|
|
#endif
|
|
|
|
if (dev->d_iob != NULL)
|
|
{
|
|
buf = dev->d_buf;
|
|
|
|
/* Set the device buffer to l2 */
|
|
|
|
dev->d_buf = NETLLBUF;
|
|
ret = ipv6_in(dev);
|
|
|
|
dev->d_buf = buf;
|
|
|
|
return ret;
|
|
}
|
|
|
|
return netdev_input(dev, ipv6_in, true);
|
|
}
|
|
#endif /* CONFIG_NET_IPv6 */
|