214 lines
6.9 KiB
C
214 lines
6.9 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_radvertise.c
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* Send an ICMPv6 Router Advertisement
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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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#include <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/icmpv6.h>
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#include "netdev/netdev.h"
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#include "inet/inet.h"
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#include "utils/utils.h"
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_ROUTER
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
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static const net_ipv6addr_t g_ipv6_prefix =
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{
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HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
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};
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#endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ipv6addr_mask
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*
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* Description:
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* Copy an IPv6 address under a mask
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*
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* Input Parameters:
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* dest - Location to return the masked address
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* src - The IPv6 address to mask
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* maksk - The address mask
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifndef CONFIG_NET_ICMPv6_ROUTER_MANUAL
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static inline void ipv6addr_mask(FAR uint16_t *dest, FAR const uint16_t *src,
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FAR const uint16_t *mask)
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{
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int i;
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for (i = 0; i < 8; ++i)
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{
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dest[i] = src[i] & mask[i];
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}
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}
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#endif /* !CONFIG_NET_ICMPv6_ROUTER_MANUAL */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_radvertise
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*
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* Description:
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* Send an ICMPv6 Router Advertisement
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*
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* Input Parameters:
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* dev - The device driver structure containing the outgoing ICMPv6 packet
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* buffer
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*
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* Returned Value:
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* None
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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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void icmpv6_radvertise(FAR struct net_driver_s *dev)
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{
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FAR struct icmpv6_router_advertise_s *adv;
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FAR struct icmpv6_srclladdr_s *srcaddr;
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FAR struct icmpv6_mtu_s *mtu;
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FAR struct icmpv6_prefixinfo_s *prefix;
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net_ipv6addr_t srcv6addr;
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uint16_t lladdrsize;
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uint16_t l3size;
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/* Length excludes the IPv6 header */
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lladdrsize = netdev_lladdrsize(dev);
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l3size = sizeof(struct icmpv6_router_advertise_s) +
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SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize) +
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sizeof(struct icmpv6_mtu_s) +
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sizeof(struct icmpv6_prefixinfo_s);
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/* Source IP address must be set to link-local IP */
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icmpv6_linkipaddr(dev, srcv6addr);
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ipv6_build_header(IPv6BUF, l3size, IP_PROTO_ICMP6,
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srcv6addr, g_ipv6_allnodes, 255);
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/* Set up the ICMPv6 Router Advertise response */
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adv = IPBUF(IPv6_HDRLEN);
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adv->type = ICMPV6_ROUTER_ADVERTISE; /* Message type */
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adv->code = 0; /* Message qualifier */
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adv->hoplimit = 64; /* Current hop limit */
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adv->flags = ICMPv6_RADV_FLAG_M; /* Managed address flag. */
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adv->lifetime = HTONS(1800); /* Router lifetime */
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adv->reachable = 0; /* Reachable time */
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adv->retrans = 0; /* Retransmission timer */
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/* Set up the source address option */
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srcaddr = (FAR struct icmpv6_srclladdr_s *)
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((FAR uint8_t *)adv +
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sizeof(struct icmpv6_router_advertise_s));
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srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
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srcaddr->optlen = ICMPv6_OPT_OCTECTS(lladdrsize);
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memcpy(srcaddr->srclladdr, &dev->d_mac, lladdrsize);
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/* Set up the MTU option */
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mtu = (FAR struct icmpv6_mtu_s *)
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((FAR uint8_t *)srcaddr +
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SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize));
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mtu->opttype = ICMPv6_OPT_MTU;
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mtu->optlen = 1;
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mtu->reserved = 0;
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mtu->mtu = HTONL(dev->d_pktsize - dev->d_llhdrlen);
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/* Set up the prefix option */
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prefix = (FAR struct icmpv6_prefixinfo_s *)
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((FAR uint8_t *)mtu + sizeof(struct icmpv6_mtu_s));
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prefix->opttype = ICMPv6_OPT_PREFIX;
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prefix->optlen = 4;
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prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
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prefix->vlifetime = HTONL(2592000);
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prefix->plifetime = HTONL(604800);
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prefix->reserved[0] = 0;
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prefix->reserved[1] = 0;
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#ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
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/* Copy the configured prefex */
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prefix->preflen = CONFIG_NET_ICMPv6_PREFLEN;
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net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
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#else
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/* Set the prefix and prefix length based on net driver IP and netmask */
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prefix->preflen = net_ipv6_mask2pref(dev->d_ipv6netmask);
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ipv6addr_mask(prefix->prefix, dev->d_ipv6addr, dev->d_ipv6netmask);
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#endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
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/* Calculate the checksum over both the ICMP header and payload */
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adv->chksum = 0;
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adv->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
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/* Set the size to the size of the IPv6 header and the payload size */
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dev->d_len = IPv6_HDRLEN + l3size;
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ninfo("Outgoing ICMPv6 Router Advertise length: %d\n", dev->d_len);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6_ROUTER */
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