mirror of
https://git.openwrt.org/feed/packages.git
synced 2024-06-14 11:23:57 +02:00
101 lines
3.3 KiB
Diff
101 lines
3.3 KiB
Diff
--- a/relay/dhcrelay.c
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+++ b/relay/dhcrelay.c
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@@ -60,6 +60,7 @@
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int client_packet_errors = 0; /* Errors sending packets to clients. */
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int add_agent_options = 0; /* If nonzero, add relay agent options. */
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+int add_rfc3527_suboption = 0; /* If nonzero, add RFC3527 link selection sub-option. */
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int agent_option_errors = 0; /* Number of packets forwarded without
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agent options because there was no room. */
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@@ -99,6 +100,8 @@
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struct sockaddr_in to;
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} *servers;
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+struct interface_info *uplink;
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+
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#ifdef DHCPv6
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struct stream_list {
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struct stream_list *next;
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@@ -147,6 +150,7 @@
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" [-pf <pid-file>] [--no-pid]\n"\
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" [-m append|replace|forward|discard]\n" \
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" [-i interface0 [ ... -i interfaceN]\n" \
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+" [-l interface]\n" \
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" server0 [ ... serverN]\n\n" \
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" dhcrelay -6 [-d] [-q] [-I] [-c <hops>] [-p <port>]\n" \
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" [-pf <pid-file>] [--no-pid]\n" \
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@@ -161,6 +165,7 @@
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" [-pf <pid-file>] [--no-pid]\n" \
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" [-m append|replace|forward|discard]\n" \
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" [-i interface0 [ ... -i interfaceN]\n" \
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+" [-l interface]\n" \
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" server0 [ ... serverN]\n\n"
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#endif
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@@ -325,6 +330,20 @@
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agent_relay_mode = discard;
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} else
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usage();
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+ } else if (!strcmp (argv [i], "-l")) {
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+ add_agent_options = 1;
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+ add_rfc3527_suboption = 1;
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+ if (++i == argc)
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+ usage();
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+
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+ status = interface_allocate(&uplink, MDL);
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+ if (status != ISC_R_SUCCESS)
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+ log_fatal("%s: interface_allocate: %s",
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+ argv[i],
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+ isc_result_totext(status));
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+ strcpy(uplink->name, argv[i]);
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+ interface_snorf(uplink, INTERFACE_REQUESTED);
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+ //interface_dereference(&uplink, MDL);
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} else if (!strcmp(argv[i], "-D")) {
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#ifdef DHCPv6
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if (local_family_set && (local_family == AF_INET6)) {
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@@ -711,12 +730,17 @@
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ip->addresses[0])))
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return;
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+ /* RFC3527: Replace giaddr address by uplink address. The original
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+ * giaddr will be used in the link selection sub-option */
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+ if (add_rfc3527_suboption)
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+ packet->giaddr = uplink->addresses[0];
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+
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/* If giaddr is not already set, Set it so the server can
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figure out what net it's from and so that we can later
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forward the response to the correct net. If it's already
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set, the response will be sent directly to the relay agent
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that set giaddr, so we won't see it. */
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- if (!packet->giaddr.s_addr)
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+ else if (!packet->giaddr.s_addr)
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packet->giaddr = ip->addresses[0];
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if (packet->hops < max_hop_count)
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packet->hops = packet->hops + 1;
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@@ -1090,6 +1114,9 @@
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optlen += ip->remote_id_len + 2; /* RAI_REMOTE_ID + len */
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}
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+ if (add_rfc3527_suboption)
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+ optlen += 6;
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+
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/* We do not support relay option fragmenting(multiple options to
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* support an option data exceeding 255 bytes).
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*/
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@@ -1121,6 +1148,14 @@
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memcpy(sp, ip->remote_id, ip->remote_id_len);
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sp += ip->remote_id_len;
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}
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+
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+ if (add_rfc3527_suboption) {
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+ *sp++ = RAI_LINK_SELECT;
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+ *sp++ = 4u;
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+ memcpy(sp, &giaddr.s_addr, 4);
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+ sp += 4;
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+ log_debug ("RFC3527 link selection sub-option added: %s", inet_ntoa(giaddr));
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+ }
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} else {
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++agent_option_errors;
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log_error("No room in packet (used %d of %d) "
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