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sys/net/dhcpv6: add IA Prefix Option in SOLICIT

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Add the IA Prefix Option when soliciting a prefix so we can tell the
server what prefix length we want.
This commit is contained in:
Benjamin Valentin 2023-01-31 14:49:59 +01:00 committed by Benjamin Valentin
parent 12a05b8fa2
commit 54fe031705
1 changed files with 27 additions and 7 deletions
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34
sys/net/application_layer/dhcpv6/client.c
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@ -423,15 +423,32 @@ static inline size_t _compose_oro_opt(dhcpv6_opt_oro_t *oro, uint16_t *opts,
}
static inline size_t _compose_ia_pd_opt(dhcpv6_opt_ia_pd_t *ia_pd,
uint32_t ia_id, uint16_t opts_len)
const pfx_lease_t *lease)
{
uint16_t len = 12U + opts_len;
uint16_t len = 12;
/* add IA Prefix Option if length was given*/
if (lease->pfx_len != 0) {
dhcpv6_opt_iapfx_t *iapfx = (dhcpv6_opt_iapfx_t *)ia_pd->opts;
uint16_t iapfx_len = 25;
/* set all unused/requested fields to 0 */
memset(iapfx, 0, sizeof(*iapfx));
iapfx->type = byteorder_htons(DHCPV6_OPT_IAPFX);
iapfx->len = byteorder_htons(iapfx_len);
iapfx->pfx_len = lease->pfx_len;
len += iapfx_len + sizeof(dhcpv6_opt_t);
}
/* write Identity Association for Prefix Delegation Option */
ia_pd->type = byteorder_htons(DHCPV6_OPT_IA_PD);
ia_pd->len = byteorder_htons(len);
ia_pd->ia_id = byteorder_htonl(ia_id);
ia_pd->ia_id = byteorder_htonl(lease->parent.ia_id.id);
ia_pd->t1.u32 = 0;
ia_pd->t2.u32 = 0;
return len + sizeof(dhcpv6_opt_t);
}
@ -486,12 +503,15 @@ static inline size_t _add_ia_pd_from_config(uint8_t *buf, size_t len_max)
size_t msg_len = 0;
for (unsigned i = 0; i < CONFIG_DHCPV6_CLIENT_PFX_LEASE_MAX; i++) {
uint32_t ia_id = pfx_leases[i].parent.ia_id.id;
if (ia_id != 0) {
dhcpv6_opt_ia_pd_t *ia_pd = (dhcpv6_opt_ia_pd_t *)(&buf[msg_len]);
pfx_lease_t *lease = &pfx_leases[i];
msg_len += _compose_ia_pd_opt(ia_pd, ia_id, 0U);
if (lease->parent.ia_id.id == 0) {
continue;
}
/* add Identity Association for Prefix Delegation Option */
dhcpv6_opt_ia_pd_t *ia_pd = (dhcpv6_opt_ia_pd_t *)(&buf[msg_len]);
msg_len += _compose_ia_pd_opt(ia_pd, lease);
}
if (msg_len > len_max) {