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Implements RDNSS standard

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Sends DNS information within RA messages (if enabled)
This commit is contained in:
Víctor Ariño 2014-04-16 15:22:31 +02:00 committed by Adam Dunkels
parent c97dc2c7da
commit 27afb5a2ae
2 changed files with 80 additions and 1 deletions
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42
core/net/ipv6/uip-nd6.c
View File

@ -72,6 +72,7 @@
#include "net/ipv6/uip-icmp6.h"
#include "net/ipv6/uip-nd6.h"
#include "net/ipv6/uip-ds6.h"
#include "net/ip/uip-nameserver.h"
#include "lib/random.h"
/*------------------------------------------------------------------*/
@ -112,6 +113,7 @@ void uip_log(char *msg);
#define UIP_ND6_OPT_HDR_BUF ((uip_nd6_opt_hdr *)&uip_buf[uip_l2_l3_icmp_hdr_len + nd6_opt_offset])
#define UIP_ND6_OPT_PREFIX_BUF ((uip_nd6_opt_prefix_info *)&uip_buf[uip_l2_l3_icmp_hdr_len + nd6_opt_offset])
#define UIP_ND6_OPT_MTU_BUF ((uip_nd6_opt_mtu *)&uip_buf[uip_l2_l3_icmp_hdr_len + nd6_opt_offset])
#define UIP_ND6_OPT_RDNSS_BUF ((uip_nd6_opt_dns *)&uip_buf[uip_l2_l3_icmp_hdr_len + nd6_opt_offset])
/** @} */
static uint8_t nd6_opt_offset; /** Offset from the end of the icmpv6 header to the option in uip_buf*/
@ -715,6 +717,29 @@ uip_nd6_ra_output(uip_ipaddr_t * dest)
uip_len += UIP_ND6_OPT_MTU_LEN;
nd6_opt_offset += UIP_ND6_OPT_MTU_LEN;
#if UIP_ND6_RA_RDNSS
if(uip_nameserver_count() > 0) {
uint8_t i = 0;
uip_ipaddr_t *ip = &UIP_ND6_OPT_RDNSS_BUF->ip;
uip_ipaddr_t *dns = NULL;
UIP_ND6_OPT_RDNSS_BUF->type = UIP_ND6_OPT_RDNSS;
UIP_ND6_OPT_RDNSS_BUF->reserved = 0;
UIP_ND6_OPT_RDNSS_BUF->lifetime = uip_nameserver_next_expiration();
if(UIP_ND6_OPT_RDNSS_BUF->lifetime != UIP_NAMESERVER_INFINITE_LIFETIME) {
UIP_ND6_OPT_RDNSS_BUF->lifetime -= clock_seconds();
}
while((dns = uip_nameserver_get(i)) != NULL) {
uip_ipaddr_copy(ip++, dns);
i++;
}
UIP_ND6_OPT_RDNSS_BUF->len = UIP_ND6_OPT_RDNSS_LEN + (i << 1);
PRINTF("%d nameservers reported\n", i);
uip_len += UIP_ND6_OPT_RDNSS_BUF->len << 3;
nd6_opt_offset += UIP_ND6_OPT_RDNSS_BUF->len << 3;
}
#endif /* UIP_ND6_RA_RDNSS */
UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
@ -938,6 +963,23 @@ ra_input(void)
/* End of autonomous flag related processing */
}
break;
#if UIP_ND6_RA_RDNSS
case UIP_ND6_OPT_RDNSS:
if(UIP_ND6_RA_BUF->flags_reserved & (UIP_ND6_O_FLAG << 6)){
PRINTF("Processing RDNSS option\n");
uint8_t naddr = (UIP_ND6_OPT_RDNSS_BUF->len - 1) / 2;
uip_ipaddr_t *ip = (uip_ipaddr_t *)(&UIP_ND6_OPT_RDNSS_BUF->ip);
PRINTF("got %d nameservers\n", naddr);
while(naddr-- > 0) {
PRINTF(" nameserver: ");
PRINT6ADDR(ip);
PRINTF(" lifetime: %lx\n", uip_ntohl(UIP_ND6_OPT_RDNSS_BUF->lifetime));
uip_nameserver_update(ip, uip_ntohl(UIP_ND6_OPT_RDNSS_BUF->lifetime));
ip++;
}
}
break;
#endif /* UIP_ND6_RA_RDNSS */
default:
PRINTF("ND option not supported in RA");
break;

39
core/net/ipv6/uip-nd6.h
View File

@ -87,7 +87,7 @@
#define UIP_ND6_MIN_RA_INTERVAL UIP_CONF_ND6_MIN_RA_INTERVAL
#endif
#define UIP_ND6_M_FLAG 0
#define UIP_ND6_O_FLAG 0
#define UIP_ND6_O_FLAG (UIP_ND6_RA_RDNSS || UIP_ND6_RA_DNSSL)
#define UIP_ND6_ROUTER_LIFETIME 3 * UIP_ND6_MAX_RA_INTERVAL
#define UIP_ND6_MAX_INITIAL_RA_INTERVAL 16 /*seconds*/
@ -139,6 +139,30 @@
/** @} */
/** \name RFC 6106 RA DNS Options Constants */
/** @{ */
#ifndef UIP_CONF_ND6_RA_RDNSS
#define UIP_ND6_RA_RDNSS 0
#else
#define UIP_ND6_RA_RDNSS UIP_CONF_ND6_RA_RDNSS
#endif
/** \brief Number of DNS to hold on the node */
#if UIP_ND6_RA_RDNSS
#define UIP_ND6_RDNSS_POOL_SIZE 2
#else
#define UIP_ND6_RDNSS_POOL_SIZE 0
#endif
#ifndef UIP_CONF_ND6_RA_DNSSL
#define UIP_ND6_RA_DNSSL 0
#else
#error Not implemented
#define UIP_ND6_RA_DNSSL UIP_CONF_ND6_RA_DNSSL
#endif
/** @} */
/** \name ND6 option types */
/** @{ */
#define UIP_ND6_OPT_SLLAO 1
@ -146,6 +170,8 @@
#define UIP_ND6_OPT_PREFIX_INFO 3
#define UIP_ND6_OPT_REDIRECTED_HDR 4
#define UIP_ND6_OPT_MTU 5
#define UIP_ND6_OPT_RDNSS 25
#define UIP_ND6_OPT_DNSSL 31
/** @} */
/** \name ND6 option types */
@ -168,6 +194,8 @@
#define UIP_ND6_OPT_HDR_LEN 2
#define UIP_ND6_OPT_PREFIX_INFO_LEN 32
#define UIP_ND6_OPT_MTU_LEN 8
#define UIP_ND6_OPT_RDNSS_LEN 1
#define UIP_ND6_OPT_DNSSL_LEN 1
/* Length of TLLAO and SLLAO options, it is L2 dependant */
@ -290,6 +318,15 @@ typedef struct uip_nd6_opt_mtu {
uint32_t mtu;
} uip_nd6_opt_mtu;
/** \brief ND option RDNSS */
typedef struct uip_nd6_opt_dns {
uint8_t type;
uint8_t len;
uint16_t reserved;
uint32_t lifetime;
uip_ipaddr_t ip;
} uip_nd6_opt_dns;
/** \struct Redirected header option */
typedef struct uip_nd6_opt_redirected_hdr {
uint8_t type;