dhcpv6: allow flash renumbering in hybrid management mode
[project/odhcpd.git] / src / dhcpv6-ia.c
index 90dcaf5..6ece528 100644 (file)
@@ -595,7 +595,7 @@ static void update(struct interface *iface)
        int minprefix = -1;
 
        for (int i = 0; i < len; ++i) {
-               if (addr[i].prefix > minprefix)
+               if (addr[i].preferred > 0 && addr[i].prefix > minprefix)
                        minprefix = addr[i].prefix;
 
                addr[i].addr.s6_addr32[3] = 0;
@@ -800,6 +800,9 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 #endif
                                        datalen += entrlen + 4;
                                } else {
+                                       if (!a->accept_reconf && iface->managed < RELAYD_MANAGED_NO_AFLAG)
+                                               prefix_pref = 1;
+
                                        struct dhcpv6_ia_addr n = {
                                                .type = htons(DHCPV6_OPT_IA_ADDR),
                                                .len = htons(sizeof(n) - 4),
@@ -873,7 +876,7 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
                                                        addr.s6_addr32[1] |= htonl(a->assigned);
 
                                                        if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
-                                                                       p->prefix == a->length)
+                                                                       p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
                                                                found = true;
                                                } else {
                                                        addr.s6_addr32[3] = htonl(a->assigned);
@@ -926,6 +929,87 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 }
 
 
+static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
+               const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
+{
+       const char *type = "UNKNOWN";
+       const char *status = "UNKNOWN";
+
+       if (msgtype == DHCPV6_MSG_RENEW)
+               return;
+
+       switch (msgtype) {
+       case DHCPV6_MSG_SOLICIT:
+               type = "SOLICIT";
+               break;
+       case DHCPV6_MSG_REQUEST:
+               type = "REQUEST";
+               break;
+       case DHCPV6_MSG_CONFIRM:
+               type = "CONFIRM";
+               break;
+       case DHCPV6_MSG_RENEW:
+               type = "RENEW";
+               break;
+       case DHCPV6_MSG_REBIND:
+               type = "REBIND";
+               break;
+       case DHCPV6_MSG_RELEASE:
+               type = "RELEASE";
+               break;
+       case DHCPV6_MSG_DECLINE:
+               type = "DECLINE";
+               break;
+       }
+
+       switch (code) {
+       case DHCPV6_STATUS_OK:
+               status = "ok";
+               break;
+       case DHCPV6_STATUS_NOADDRSAVAIL:
+               status = "no addresses available";
+               break;
+       case DHCPV6_STATUS_NOBINDING:
+               status = "no binding";
+               break;
+       case DHCPV6_STATUS_NOTONLINK:
+               status = "not on-link";
+               break;
+       case DHCPV6_STATUS_NOPREFIXAVAIL:
+               status = "no prefix available";
+               break;
+       }
+
+       char leasebuf[256] = "";
+
+       if (a) {
+               struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
+               size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
+               size_t lbsize = 0;
+               char addrbuf[INET6_ADDRSTRLEN];
+
+               for (size_t i = 0; i < addrlen; ++i) {
+                       if (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)now)
+                               continue;
+
+                       struct in6_addr addr = addrs[i].addr;
+                       int prefix = a->managed ? addrs[i].prefix : a->length;
+                       if (prefix == 128)
+                               addr.s6_addr32[3] = htonl(a->assigned);
+                       else
+                               addr.s6_addr32[1] |= htonl(a->assigned);
+
+                       inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
+                       lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
+               }
+       }
+
+       syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
+                       duidbuf, iface->ifname, status, leasebuf);
+}
+
+
+
 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
                const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
 {
@@ -942,6 +1026,7 @@ ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
        size_t hostname_len = 0;
        bool class_oro = false;
        bool notonlink = false;
+       char duidbuf[261];
 
        dhcpv6_for_each_option(start, end, otype, olen, odata) {
                if (otype == DHCPV6_OPT_CLIENTID) {
@@ -952,6 +1037,9 @@ ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
                                memcpy(mac, &odata[8], sizeof(mac));
                        else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
                                memcpy(mac, &odata[4], sizeof(mac));
+
+                       if (olen <= 130)
+                               odhcpd_hexlify(duidbuf, odata, olen);
                } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
                        uint8_t fqdn_buf[256];
                        memcpy(fqdn_buf, odata, olen);
@@ -1196,6 +1284,7 @@ ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
                buf += ia_response_len;
                buflen -= ia_response_len;
                response_len += ia_response_len;
+               dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
        }
 
        if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&