Complete managed PD/CER-ID support

[project/odhcpd.git] / src / dhcpv6.c

diff --git a/src/dhcpv6.c b/src/dhcpv6.c
index 9b802c4..62f30e2 100644 (file)
--- a/src/dhcpv6.c
+++ b/src/dhcpv6.c
@@ -22,6 +22,8 @@
 #include "odhcpd.h"
 #include "dhcpv6.h"
 
+static const char *excluded_class = "HOMENET";
+
 
 static void relay_client_request(struct sockaddr_in6 *source,
                const void *data, size_t len, struct interface *iface);
@@ -99,7 +101,7 @@ int setup_dhcpv6_interface(struct interface *iface, bool enable)
 
 
 static void handle_nested_message(uint8_t *data, size_t len,
-               uint8_t **opts, uint8_t **end, struct iovec iov[6])
+               uint8_t **opts, uint8_t **end, struct iovec iov[9])
 {
        struct dhcpv6_relay_header *hdr = (struct dhcpv6_relay_header*)data;
        if (iov[0].iov_base == NULL) {
@@ -122,8 +124,8 @@ static void handle_nested_message(uint8_t *data, size_t len,
        uint8_t *odata;
        dhcpv6_for_each_option(hdr->options, data + len, otype, olen, odata) {
                if (otype == DHCPV6_OPT_RELAY_MSG) {
-                       iov[7].iov_base = odata + olen;
-                       iov[7].iov_len = (((uint8_t*)iov[0].iov_base) + iov[0].iov_len)
+                       iov[8].iov_base = odata + olen;
+                       iov[8].iov_len = (((uint8_t*)iov[0].iov_base) + iov[0].iov_len)
                                        - (odata + olen);
                        handle_nested_message(odata, olen, opts, end, iov);
                        return;
@@ -173,6 +175,9 @@ static void handle_client_request(void *addr, void *data, size_t len,
                uint16_t duid_type;
                uint16_t hardware_type;
                uint8_t mac[6];
+               uint16_t solmaxrt_type;
+               uint16_t solmaxrt_length;
+               uint32_t solmaxrt_value;
                uint16_t clientid_type;
                uint16_t clientid_length;
                uint8_t clientid_buf[130];
@@ -182,6 +187,9 @@ static void handle_client_request(void *addr, void *data, size_t len,
                .serverid_length = htons(10),
                .duid_type = htons(3),
                .hardware_type = htons(1),
+               .solmaxrt_type = htons(DHCPV6_OPT_SOL_MAX_RT),
+               .solmaxrt_length = htons(4),
+               .solmaxrt_value = htonl(60),
                .clientid_type = htons(DHCPV6_OPT_CLIENTID),
                .clientid_buf = {0}
        };
@@ -236,6 +244,14 @@ static void handle_client_request(void *addr, void *data, size_t len,
        } search = {htons(DHCPV6_OPT_DNS_DOMAIN), htons(search_len)};
 
 
+       struct dhcpv6_cer_id cerid = {
+#ifdef EXT_CER_ID
+               .type = htons(EXT_CER_ID),
+#endif
+               .len = htons(36),
+               .addr = iface->dhcpv6_pd_cer,
+       };
+
 
        uint8_t pdbuf[512];
        struct iovec iov[] = {{NULL, 0},
@@ -245,6 +261,7 @@ static void handle_client_request(void *addr, void *data, size_t len,
                        {&search, (search_len) ? sizeof(search) : 0},
                        {search_domain, search_len},
                        {pdbuf, 0},
+                       {&cerid, 0},
                        {NULL, 0}};
 
        uint8_t *opts = (uint8_t*)&hdr[1], *opts_end = (uint8_t*)data + len;
@@ -275,19 +292,42 @@ static void handle_client_request(void *addr, void *data, size_t len,
                        if (olen != ntohs(dest.serverid_length) ||
                                        memcmp(odata, &dest.duid_type, olen))
                                return; // Not for us
+               } else if (otype == DHCPV6_OPT_USER_CLASS) {
+                       uint8_t *c = odata, *cend = &odata[olen];
+                       for (; &c[2] <= cend && &c[2 + (c[0] << 8) + c[1]] <= cend; c = &c[2 + (c[0] << 8) + c[1]]) {
+                               size_t elen = strlen(excluded_class);
+                               if (((((size_t)c[0]) << 8) | c[1]) == elen && !memcmp(&c[2], excluded_class, elen))
+                                       return; // Ignore from homenet
+                       }
+               } else if (otype == DHCPV6_OPT_IA_PD) {
+#ifdef EXT_CER_ID
+                       iov[7].iov_len = sizeof(cerid);
+
+                       if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)) {
+                               struct odhcpd_ipaddr addrs[32];
+                               ssize_t len = odhcpd_get_interface_addresses(0, addrs,
+                                               sizeof(addrs) / sizeof(*addrs));
+
+                               for (ssize_t i = 0; i < len; ++i)
+                                       if (IN6_IS_ADDR_UNSPECIFIED(&cerid.addr)
+                                                       || memcmp(&addrs[i].addr, &cerid.addr, sizeof(cerid.addr)) < 0)
+                                               cerid.addr = addrs[i].addr;
+                       }
+#endif
                }
        }
 
        if (opts[-4] != DHCPV6_MSG_INFORMATION_REQUEST) {
-               iov[6].iov_len = dhcpv6_handle_ia(pdbuf, sizeof(pdbuf), iface, addr, &opts[-4], opts_end);
-               if (iov[6].iov_len == 0 && opts[-4] == DHCPV6_MSG_REBIND)
+               ssize_t ialen = dhcpv6_handle_ia(pdbuf, sizeof(pdbuf), iface, addr, &opts[-4], opts_end);
+               iov[6].iov_len = ialen;
+               if (ialen < 0 || (ialen == 0 && opts[-4] == DHCPV6_MSG_REBIND))
                        return;
        }
 
        if (iov[0].iov_len > 0) // Update length
                update_nested_message(data, len, iov[1].iov_len + iov[2].iov_len +
                                iov[3].iov_len + iov[4].iov_len + iov[5].iov_len +
-                               iov[6].iov_len - (4 + opts_end - opts));
+                               iov[6].iov_len + iov[7].iov_len - (4 + opts_end - opts));
 
        odhcpd_send(iface->dhcpv6_event.uloop.fd, addr, iov, ARRAY_SIZE(iov), iface);
 }