dhcp6: Add function to iterate and fetch delegated prefixes

Add a function for fetching the next delegated prefix and another
one to reset the iteration to the first prefix.

3 files changed, 37 insertions, 0 deletions

diff --git a/src/libsystemd-network/dhcp6-lease-internal.h b/src/libsystemd-network/dhcp6-lease-internal.h
index ba9e9945dc..45e0e82427 100644
--- a/src/libsystemd-network/dhcp6-lease-internal.h
+++ b/src/libsystemd-network/dhcp6-lease-internal.h
@@ -39,6 +39,7 @@ struct sd_dhcp6_lease {
         DHCP6IA pd;
 
         DHCP6Address *addr_iter;
+        DHCP6Address *prefix_iter;
 
         struct in6_addr *dns;
         size_t dns_count;
diff --git a/src/libsystemd-network/sd-dhcp6-lease.c b/src/libsystemd-network/sd-dhcp6-lease.c
index 32815a5386..1f3a782f8c 100644
--- a/src/libsystemd-network/sd-dhcp6-lease.c
+++ b/src/libsystemd-network/sd-dhcp6-lease.c
@@ -176,6 +176,37 @@ void sd_dhcp6_lease_reset_address_iter(sd_dhcp6_lease *lease) {
                 lease->addr_iter = lease->ia.addresses;
 }
 
+int sd_dhcp6_lease_get_pd(sd_dhcp6_lease *lease, struct in6_addr *prefix,
+                          uint8_t *prefix_len,
+                          uint32_t *lifetime_preferred,
+                          uint32_t *lifetime_valid) {
+        assert_return(lease, -EINVAL);
+        assert_return(prefix, -EINVAL);
+        assert_return(prefix_len, -EINVAL);
+        assert_return(lifetime_preferred, -EINVAL);
+        assert_return(lifetime_valid, -EINVAL);
+
+        if (!lease->prefix_iter)
+                return -ENOMSG;
+
+        memcpy(prefix, &lease->prefix_iter->iapdprefix.address,
+               sizeof(struct in6_addr));
+        *prefix_len = lease->prefix_iter->iapdprefix.prefixlen;
+        *lifetime_preferred =
+                be32toh(lease->prefix_iter->iapdprefix.lifetime_preferred);
+        *lifetime_valid =
+                be32toh(lease->prefix_iter->iapdprefix.lifetime_valid);
+
+        lease->prefix_iter = lease->prefix_iter->addresses_next;
+
+        return 0;
+}
+
+void sd_dhcp6_lease_reset_pd_prefix_iter(sd_dhcp6_lease *lease) {
+        if (lease)
+                lease->prefix_iter = lease->pd.addresses;
+}
+
 int dhcp6_lease_set_dns(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
         int r;
 
diff --git a/src/systemd/sd-dhcp6-lease.h b/src/systemd/sd-dhcp6-lease.h
index 5807b1836b..22a5f8ce75 100644
--- a/src/systemd/sd-dhcp6-lease.h
+++ b/src/systemd/sd-dhcp6-lease.h
@@ -36,6 +36,11 @@ int sd_dhcp6_lease_get_address(sd_dhcp6_lease *lease,
                                struct in6_addr *addr,
                                uint32_t *lifetime_preferred,
                                uint32_t *lifetime_valid);
+void sd_dhcp6_lease_reset_pd_prefix_iter(sd_dhcp6_lease *lease);
+int sd_dhcp6_lease_get_pd(sd_dhcp6_lease *lease, struct in6_addr *prefix,
+                          uint8_t *prefix_len,
+                          uint32_t *lifetime_preferred,
+                          uint32_t *lifetime_valid);
 
 int sd_dhcp6_lease_get_dns(sd_dhcp6_lease *lease, struct in6_addr **addrs);
 int sd_dhcp6_lease_get_domains(sd_dhcp6_lease *lease, char ***domains);