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nhrpd: add NHS details in NAT Extension header

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Hub uses this to check if is itself behind a NAT

Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
This commit is contained in:
Amol Lad 2021-02-26 14:48:25 +05:30 committed by Reuben Dowle
parent 1bd508da17
commit 94eae49d01
1 changed files with 15 additions and 2 deletions
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17
nhrpd/nhrp_nhs.c
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@ -162,7 +162,7 @@ static int nhrp_reg_send_req(struct thread *t)
struct interface *ifp = nhs->ifp;
struct nhrp_interface *nifp = ifp->info;
struct nhrp_afi_data *if_ad = &nifp->afi[nhs->afi];
union sockunion *dst_proto;
union sockunion *dst_proto, nhs_proto;
struct zbuf *zb;
struct nhrp_packet_header *hdr;
struct nhrp_extension_header *ext;
@ -214,9 +214,22 @@ static int nhrp_reg_send_req(struct thread *t)
nhrp_ext_request(zb, hdr, ifp);
/* Cisco NAT detection extension */
if (sockunion_family(&r->proto_addr) != AF_UNSPEC) {
nhs_proto = r->proto_addr;
} else if (sockunion_family(&nhs->proto_addr) != AF_UNSPEC) {
nhs_proto = nhs->proto_addr;
} else {
/* cisco magic: If NHS is not known then use all 0s as
* client protocol address in NAT Extension header
*/
memset(&nhs_proto, 0, sizeof(nhs_proto));
sockunion_family(&nhs_proto) = afi2family(nhs->afi);
}
hdr->flags |= htons(NHRP_FLAG_REGISTRATION_NAT);
ext = nhrp_ext_push(zb, hdr, NHRP_EXTENSION_NAT_ADDRESS);
cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &nifp->nbma, &if_ad->addr);
/* push NHS details */
cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &r->peer->vc->remote.nbma, &nhs_proto);
cie->prefix_length = 8 * sockunion_get_addrlen(&if_ad->addr);
cie->mtu = htons(if_ad->mtu);
nhrp_ext_complete(zb, ext);