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gnrc_ipv6_nib: handle route information option

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This commit is contained in:
Benjamin Valentin 2021-06-16 12:45:12 +02:00 committed by Benjamin Valentin
parent 68afd9d900
commit 12a0d481dc
3 changed files with 58 additions and 0 deletions
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1
makefiles/pseudomodules.inc.mk
View File

@ -40,6 +40,7 @@ PSEUDOMODULES += gnrc_ipv6_nib_6lbr
PSEUDOMODULES += gnrc_ipv6_nib_6ln
PSEUDOMODULES += gnrc_ipv6_nib_6lr
PSEUDOMODULES += gnrc_ipv6_nib_dns
PSEUDOMODULES += gnrc_ipv6_nib_rio
PSEUDOMODULES += gnrc_ipv6_nib_router
PSEUDOMODULES += gnrc_netdev_default
PSEUDOMODULES += gnrc_neterr

1
sys/net/gnrc/Makefile.dep
View File

@ -246,6 +246,7 @@ ifneq (,$(filter gnrc_ipv6_default,$(USEMODULE)))
endif
ifneq (,$(filter gnrc_ipv6_router_default,$(USEMODULE)))
USEMODULE += gnrc_ipv6_nib_rio
USEMODULE += gnrc_ipv6_router
USEMODULE += gnrc_icmpv6
endif

56
sys/net/gnrc/network_layer/ipv6/nib/nib.c
View File

@ -461,6 +461,8 @@ static uint32_t _handle_pio(gnrc_netif_t *netif, const icmpv6_hdr_t *icmpv6,
static uint32_t _handle_pio(gnrc_netif_t *netif, const icmpv6_hdr_t *icmpv6,
const ndp_opt_pi_t *pio);
#endif /* CONFIG_GNRC_IPV6_NIB_MULTIHOP_P6C */
static uint32_t _handle_rio(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
const ndp_opt_ri_t *pio);
/** @} */
/* Iterator for NDP options in a packet */
@ -738,6 +740,9 @@ static void _handle_rtr_adv(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
_handle_mtuo(netif, (const icmpv6_hdr_t *)rtr_adv,
(ndp_opt_mtu_t *)opt);
break;
case NDP_OPT_RI:
_handle_rio(netif, ipv6, (ndp_opt_ri_t *)opt);
break;
case NDP_OPT_PI: {
uint32_t min_pfx_timeout;
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_MULTIHOP_P6C)
@ -1570,4 +1575,55 @@ static uint32_t _handle_pio(gnrc_netif_t *netif, const icmpv6_hdr_t *icmpv6,
return UINT32_MAX;
}
static const char *_prio_string(uint8_t prio)
{
switch (prio & NDP_OPT_RI_FLAGS_MASK) {
case NDP_OPT_RI_FLAGS_PRF_NONE:
return "none";
case NDP_OPT_RI_FLAGS_PRF_NEG:
return "-1";
case NDP_OPT_RI_FLAGS_PRF_ZERO:
return "0";
case NDP_OPT_RI_FLAGS_PRF_POS:
return "1";
}
return "invalid";
}
static uint32_t _handle_rio(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
const ndp_opt_ri_t *rio)
{
if (!IS_USED(MODULE_GNRC_IPV6_NIB_RIO)) {
return 0;
}
uint32_t route_ltime = byteorder_ntohl(rio->route_ltime);
if (ipv6_addr_is_link_local(&rio->prefix)) {
DEBUG("nib: ignoring RIO with invalid data\n");
return UINT32_MAX;
}
DEBUG("nib: received valid Route Information option:\n");
DEBUG(" - Prefix: %s/%u\n",
ipv6_addr_to_str(addr_str, &rio->prefix, sizeof(addr_str)),
rio->prefix_len);
DEBUG(" - Priority: %s\n", _prio_string(rio->flags));
DEBUG(" - Route lifetime: %" PRIu32 "\n",
byteorder_ntohl(rio->route_ltime));
if (route_ltime < UINT32_MAX) { /* UINT32_MAX means infinite lifetime */
/* the valid lifetime is given in seconds, but our timers work in
* microseconds, so we have to scale down to the smallest possible
* value (UINT32_MAX - 1). This is however alright since we ask for
* a new router advertisement before this timeout expires */
route_ltime = (route_ltime > (UINT32_MAX / MS_PER_SEC)) ?
(UINT32_MAX - 1) : route_ltime * MS_PER_SEC;
}
gnrc_ipv6_nib_ft_add(&rio->prefix, rio->prefix_len, &ipv6->src,
netif->pid, route_ltime);
return route_ltime;
}
/** @} */