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gnrc/ipv6/nib: automatically create 6ctx for downstream networks

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This commit is contained in:
Benjamin Valentin 2024-12-13 19:51:32 +01:00
parent a4026b78b8
commit 381a87e318
1 changed files with 45 additions and 0 deletions
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45
sys/net/gnrc/network_layer/ipv6/nib/nib.c
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@ -1787,6 +1787,28 @@ static const char *_prio_string(uint8_t prio)
return "invalid";
}
static gnrc_pktsnip_t *_build_ctxs(_nib_abr_entry_t *abr)
{
gnrc_pktsnip_t *ext_opts = NULL;
for (int i = 0; i < GNRC_SIXLOWPAN_CTX_SIZE; i++) {
gnrc_sixlowpan_ctx_t *ctx;
if (bf_isset(abr->ctxs, i) &&
((ctx = gnrc_sixlowpan_ctx_lookup_id(i)) != NULL)) {
gnrc_pktsnip_t *sixco = gnrc_sixlowpan_nd_opt_6ctx_build(
ctx->prefix_len, ctx->flags_id,
ctx->ltime, &ctx->prefix, ext_opts);
if (sixco == NULL) {
DEBUG("nib: No space left in packet buffer. Not adding 6LO\n");
return NULL;
}
ext_opts = sixco;
}
}
return gnrc_sixlowpan_nd_opt_abr_build(abr->version, 0, &abr->addr, ext_opts);
}
static uint32_t _handle_rio(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
const ndp_opt_ri_t *rio)
{
@ -1815,6 +1837,29 @@ static uint32_t _handle_rio(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
netif->pid, route_ltime == UINT32_MAX ? 0 : route_ltime);
}
if (IS_ACTIVE(CONFIG_GNRC_NETIF_IPV6_BR_AUTO_6CTX) && gnrc_netif_is_6lbr(netif)) {
/* configure compression context */
if (gnrc_sixlowpan_ctx_update_6ctx(&rio->prefix, rio->prefix_len, route_ltime)) {
DEBUG("nib: add compression context for prefix from RIO\n");
}
gnrc_sixlowpan_ctx_t *ctx = gnrc_sixlowpan_ctx_lookup_addr(&rio->prefix);
assert(ctx);
uint8_t ctx_id = ctx->flags_id & GNRC_SIXLOWPAN_CTX_FLAGS_CID_MASK;
_nib_abr_entry_t *abr = NULL;
DEBUG("nib: Send router advertisements with updated compression contexts\n");
while ((abr = _nib_abr_iter(abr))) {
if (!route_ltime) {
bf_unset(abr->ctxs, ctx_id);
continue;
}
bf_set(abr->ctxs, ctx_id);
gnrc_pktsnip_t *ext_opts = _build_ctxs(abr);
gnrc_ndp_rtr_adv_send(netif, NULL, &ipv6->src, false, ext_opts);
}
}
return route_ltime;
}