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nuttx/net/icmpv6/icmpv6_radvertise.c
zhanghongyu ec2b74df77 icmpv6: add RDNSS field support for send route advertise 
Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
2023-03-17 16:50:37 -03:00

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/****************************************************************************
* net/icmpv6/icmpv6_radvertise.c
* Send an ICMPv6 Router Advertisement
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <debug.h>
#include <netinet/in.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/icmpv6.h>
#include <nuttx/net/dns.h>
#include "netdev/netdev.h"
#include "inet/inet.h"
#include "utils/utils.h"
#include "icmpv6/icmpv6.h"
#ifdef CONFIG_NET_ICMPv6_ROUTER
/****************************************************************************
* Private Types
****************************************************************************/
struct rdnss_add_dns_nameserver_s
{
FAR struct icmpv6_rdnss_s *rdnss;
int nservers;
};
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
static const net_ipv6addr_t g_ipv6_prefix =
{
HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
};
#endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ipv6addr_mask
*
* Description:
* Copy an IPv6 address under a mask
*
* Input Parameters:
* dest - Location to return the masked address
* src - The IPv6 address to mask
* maksk - The address mask
*
* Returned Value:
* None
*
****************************************************************************/
#ifndef CONFIG_NET_ICMPv6_ROUTER_MANUAL
static inline void ipv6addr_mask(FAR uint16_t *dest, FAR const uint16_t *src,
FAR const uint16_t *mask)
{
int i;
for (i = 0; i < 8; ++i)
{
dest[i] = src[i] & mask[i];
}
}
#endif /* !CONFIG_NET_ICMPv6_ROUTER_MANUAL */
/****************************************************************************
* Name: icmpv6_radvertise_fill_rndss
*
* Description:
* Copy an IPv6 DNS address into RDNSS field
*
* Input Parameters:
* arg - RDNSS context infomation
* addr - DNS server address
* addrlen - length of DNS server address
*
* Returned Value:
* 0 is success
*
****************************************************************************/
#ifdef CONFIG_NET_ICMPv6_ROUTER_RDNSS
static int icmpv6_radvertise_fill_rndss(FAR void *arg,
FAR struct sockaddr *addr,
FAR socklen_t addrlen)
{
FAR struct rdnss_add_dns_nameserver_s *rdnss_context = arg;
FAR struct sockaddr_in6 *addr6;
if (addr->sa_family == AF_INET6)
{
FAR uint8_t *server = rdnss_context->rdnss->servers;
addr6 = (FAR struct sockaddr_in6 *)addr;
net_ipv6addr_copy(server + 16 * rdnss_context->nservers,
&addr6->sin6_addr);
rdnss_context->nservers++;
}
return 0;
}
#endif /* CONFIG_NET_ICMPv6_ROUTER_RDNSS */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_radvertise
*
* Description:
* Send an ICMPv6 Router Advertisement
*
* Input Parameters:
* dev - The device driver structure containing the outgoing ICMPv6 packet
* buffer
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked
*
****************************************************************************/
void icmpv6_radvertise(FAR struct net_driver_s *dev)
{
FAR struct icmpv6_router_advertise_s *adv;
FAR struct icmpv6_srclladdr_s *srcaddr;
FAR struct icmpv6_mtu_s *mtu;
FAR struct icmpv6_prefixinfo_s *prefix;
#ifdef CONFIG_NET_ICMPv6_ROUTER_RDNSS
FAR struct icmpv6_rdnss_s *rdnss;
struct rdnss_add_dns_nameserver_s rndss_context;
#endif
net_ipv6addr_t srcv6addr;
uint16_t lladdrsize;
uint16_t l3size;
/* Length excludes the IPv6 header */
lladdrsize = netdev_lladdrsize(dev);
l3size = sizeof(struct icmpv6_router_advertise_s) +
SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize) +
sizeof(struct icmpv6_mtu_s) +
sizeof(struct icmpv6_prefixinfo_s);
/* Source IP address must be set to link-local IP */
icmpv6_linkipaddr(dev, srcv6addr);
/* Set up the ICMPv6 Router Advertise response */
adv = IPBUF(IPv6_HDRLEN);
adv->type = ICMPV6_ROUTER_ADVERTISE; /* Message type */
adv->code = 0; /* Message qualifier */
adv->hoplimit = 64; /* Current hop limit */
adv->flags = ICMPv6_RADV_FLAG_M; /* Managed address flag. */
adv->lifetime = HTONS(1800); /* Router lifetime */
adv->reachable[0] = 0; /* Reachable time */
adv->reachable[1] = 0;
adv->retrans[0] = 0; /* Retransmission timer */
adv->retrans[1] = 0;
/* Set up the source address option */
srcaddr = (FAR struct icmpv6_srclladdr_s *)
((FAR uint8_t *)adv +
sizeof(struct icmpv6_router_advertise_s));
srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
srcaddr->optlen = ICMPv6_OPT_OCTECTS(lladdrsize);
memcpy(srcaddr->srclladdr, &dev->d_mac, lladdrsize);
/* Set up the MTU option */
mtu = (FAR struct icmpv6_mtu_s *)
((FAR uint8_t *)srcaddr +
SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize));
mtu->opttype = ICMPv6_OPT_MTU;
mtu->optlen = 1;
mtu->reserved = 0;
mtu->mtu[0] = 0;
mtu->mtu[1] = HTONS(dev->d_pktsize - dev->d_llhdrlen);
/* Set up the prefix option */
prefix = (FAR struct icmpv6_prefixinfo_s *)
((FAR uint8_t *)mtu + sizeof(struct icmpv6_mtu_s));
prefix->opttype = ICMPv6_OPT_PREFIX;
prefix->optlen = 4;
prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
prefix->vlifetime[0] = HTONS(2592000 >> 16);
prefix->vlifetime[1] = HTONS(2592000 & 0xffff);
prefix->plifetime[0] = HTONS(604800 >> 16);
prefix->plifetime[1] = HTONS(604800 & 0xffff);
prefix->reserved[0] = 0;
prefix->reserved[1] = 0;
#ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
/* Copy the configured prefex */
prefix->preflen = CONFIG_NET_ICMPv6_PREFLEN;
net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
#else
/* Set the prefix and prefix length based on net driver IP and netmask */
prefix->preflen = net_ipv6_mask2pref(dev->d_ipv6netmask);
ipv6addr_mask(prefix->prefix, dev->d_ipv6addr, dev->d_ipv6netmask);
#endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
#ifdef CONFIG_NET_ICMPv6_ROUTER_RDNSS
rdnss = (FAR struct icmpv6_rdnss_s *)
((FAR uint8_t *)prefix +
sizeof(struct icmpv6_prefixinfo_s));
rndss_context.rdnss = rdnss;
rndss_context.nservers = 0;
dns_foreach_nameserver(icmpv6_radvertise_fill_rndss, &rndss_context);
if (rndss_context.nservers > 0)
{
rdnss->opttype = ICMPv6_OPT_RDNSS;
rdnss->optlen = 1 + 2 * rndss_context.nservers;
rdnss->reserved = 0;
/* RFC8106: The value of Lifetime SHOULD by default be at least
* 3 * MaxRtrAdvInterval and the MaxRtrAdvInterval default value
* is 600 seconds.
*/
rdnss->lifetime[0] = 0;
rdnss->lifetime[1] = HTONS(1800);
l3size += 8 * rdnss->optlen;
}
#endif
ipv6_build_header(IPv6BUF, l3size, IP_PROTO_ICMP6,
srcv6addr, g_ipv6_allnodes, 255, 0);
/* Update device buffer length */
iob_update_pktlen(dev->d_iob, IPv6_HDRLEN + l3size);
/* Calculate the checksum over both the ICMP header and payload */
adv->chksum = 0;
adv->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
/* Set the size to the size of the IPv6 header and the payload size */
dev->d_len = IPv6_HDRLEN + l3size;
ninfo("Outgoing ICMPv6 Router Advertise length: %d\n", dev->d_len);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmpv6.sent++;
g_netstats.ipv6.sent++;
#endif
}
#endif /* CONFIG_NET_ICMPv6_ROUTER */
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