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-rw-r--r--src/plugins/dhcp/dhcp4_proxy_node.c1090
1 files changed, 1090 insertions, 0 deletions
diff --git a/src/plugins/dhcp/dhcp4_proxy_node.c b/src/plugins/dhcp/dhcp4_proxy_node.c
new file mode 100644
index 00000000000..10963c7ff47
--- /dev/null
+++ b/src/plugins/dhcp/dhcp4_proxy_node.c
@@ -0,0 +1,1090 @@
+/*
+ * proxy_node.c: dhcp proxy node processing
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <dhcp/dhcp_proxy.h>
+#include <dhcp/client.h>
+#include <vnet/fib/ip4_fib.h>
+
+static char *dhcp_proxy_error_strings[] = {
+#define dhcp_proxy_error(n,s) s,
+#include <dhcp/dhcp4_proxy_error.def>
+#undef dhcp_proxy_error
+};
+
+#define foreach_dhcp_proxy_to_server_input_next \
+ _ (DROP, "error-drop") \
+ _ (LOOKUP, "ip4-lookup") \
+ _ (SEND_TO_CLIENT, "dhcp-proxy-to-client")
+
+typedef enum
+{
+#define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
+ foreach_dhcp_proxy_to_server_input_next
+#undef _
+ DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
+} dhcp_proxy_to_server_input_next_t;
+
+typedef struct
+{
+ /* 0 => to server, 1 => to client */
+ int which;
+ ip4_address_t trace_ip4_address;
+ u32 error;
+ u32 sw_if_index;
+ u32 original_sw_if_index;
+} dhcp_proxy_trace_t;
+
+#define VPP_DHCP_OPTION82_SUB1_SIZE 6
+#define VPP_DHCP_OPTION82_SUB5_SIZE 6
+#define VPP_DHCP_OPTION82_VSS_SIZE 12
+#define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
+ VPP_DHCP_OPTION82_SUB5_SIZE + \
+ VPP_DHCP_OPTION82_VSS_SIZE +3)
+
+static vlib_node_registration_t dhcp_proxy_to_server_node;
+static vlib_node_registration_t dhcp_proxy_to_client_node;
+
+static u8 *
+format_dhcp_proxy_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ dhcp_proxy_trace_t *t = va_arg (*args, dhcp_proxy_trace_t *);
+
+ if (t->which == 0)
+ s = format (s, "DHCP proxy: sent to server %U\n",
+ format_ip4_address, &t->trace_ip4_address, t->error);
+ else
+ s = format (s, "DHCP proxy: broadcast to client from %U\n",
+ format_ip4_address, &t->trace_ip4_address);
+
+ if (t->error != (u32) ~ 0)
+ s = format (s, " error: %s\n", dhcp_proxy_error_strings[t->error]);
+
+ s = format (s, " original_sw_if_index: %d, sw_if_index: %d\n",
+ t->original_sw_if_index, t->sw_if_index);
+
+ return s;
+}
+
+static u8 *
+format_dhcp_proxy_header_with_length (u8 * s, va_list * args)
+{
+ dhcp_header_t *h = va_arg (*args, dhcp_header_t *);
+ u32 max_header_bytes = va_arg (*args, u32);
+ u32 header_bytes;
+
+ header_bytes = sizeof (h[0]);
+ if (max_header_bytes != 0 && header_bytes > max_header_bytes)
+ return format (s, "dhcp header truncated");
+
+ s = format (s, "DHCP Proxy");
+
+ return s;
+}
+
+static uword
+dhcp_proxy_to_server_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+ u32 pkts_to_server = 0, pkts_to_client = 0, pkts_no_server = 0;
+ u32 pkts_no_interface_address = 0;
+ u32 pkts_too_big = 0;
+ ip4_main_t *im = &ip4_main;
+
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ udp_header_t *u0;
+ dhcp_header_t *h0;
+ ip4_header_t *ip0;
+ u32 next0;
+ u32 old0, new0;
+ ip_csum_t sum0;
+ u32 error0 = (u32) ~ 0;
+ u32 sw_if_index = 0;
+ u32 original_sw_if_index = 0;
+ u32 fib_index;
+ dhcp_proxy_t *proxy;
+ dhcp_server_t *server;
+ u32 rx_sw_if_index;
+ dhcp_option_t *o, *end;
+ u32 len = 0;
+ u8 is_discover = 0;
+ int space_left;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ h0 = vlib_buffer_get_current (b0);
+
+ /*
+ * udp_local hands us the DHCP header, need udp hdr,
+ * ip hdr to relay to server
+ */
+ vlib_buffer_advance (b0, -(sizeof (*u0)));
+ u0 = vlib_buffer_get_current (b0);
+
+ /* This blows. Return traffic has src_port = 67, dst_port = 67 */
+ if (u0->src_port ==
+ clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_server))
+ {
+ vlib_buffer_advance (b0, sizeof (*u0));
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
+ error0 = 0;
+ pkts_to_client++;
+ goto do_enqueue;
+ }
+
+ rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ fib_index = im->fib_index_by_sw_if_index[rx_sw_if_index];
+ proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
+
+ if (PREDICT_FALSE (NULL == proxy))
+ {
+ error0 = DHCP_PROXY_ERROR_NO_SERVER;
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_no_server++;
+ goto do_trace;
+ }
+
+ if (!vlib_buffer_chain_linearize (vm, b0))
+ {
+ error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_too_big++;
+ goto do_trace;
+ }
+ space_left = vlib_buffer_space_left_at_end (vm, b0);
+ /* cant parse chains...
+ * and we need some space for option 82*/
+ if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 ||
+ space_left < VPP_DHCP_OPTION82_SIZE)
+ {
+ error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_too_big++;
+ goto do_trace;
+ }
+
+ server = &proxy->dhcp_servers[0];
+ vlib_buffer_advance (b0, -(sizeof (*ip0)));
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* disable UDP checksum */
+ u0->checksum = 0;
+ sum0 = ip0->checksum;
+ old0 = ip0->dst_address.as_u32;
+ new0 = server->dhcp_server.ip4.as_u32;
+ ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
+ sum0 = ip_csum_update (sum0, old0, new0,
+ ip4_header_t /* structure */ ,
+ dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ sum0 = ip0->checksum;
+ old0 = ip0->src_address.as_u32;
+ new0 = proxy->dhcp_src_address.ip4.as_u32;
+ ip0->src_address.as_u32 = new0;
+ sum0 = ip_csum_update (sum0, old0, new0,
+ ip4_header_t /* structure */ ,
+ src_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ /* Send to DHCP server via the configured FIB */
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index;
+
+ h0->gateway_ip_address = proxy->dhcp_src_address.ip4;
+ pkts_to_server++;
+
+ o = h0->options;
+ end = (void *) vlib_buffer_get_tail (b0);
+
+ /* TLVs are not performance-friendly... */
+ while (o->option != DHCP_PACKET_OPTION_END && o < end)
+ {
+ if (DHCP_PACKET_OPTION_MSG_TYPE == o->option)
+ {
+ if (DHCP_PACKET_DISCOVER == o->data[0])
+ {
+ is_discover = 1;
+ }
+ }
+ o = (dhcp_option_t *) (o->data + o->length);
+ }
+
+ if (o->option == DHCP_PACKET_OPTION_END && o <= end)
+ {
+ vnet_main_t *vnm = vnet_get_main ();
+ u16 old_l0, new_l0;
+ ip4_address_t _ia0, *ia0 = &_ia0;
+ dhcp_vss_t *vss;
+ vnet_sw_interface_t *swif;
+
+ original_sw_if_index = sw_if_index =
+ vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ swif = vnet_get_sw_interface (vnm, sw_if_index);
+ if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
+ sw_if_index = swif->unnumbered_sw_if_index;
+
+ /*
+ * Get the first ip4 address on the [client-side]
+ * RX interface, if not unnumbered. otherwise use
+ * the loopback interface's ip address.
+ */
+ ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
+
+ if (ia0 == 0)
+ {
+ error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_no_interface_address++;
+ goto do_trace;
+ }
+
+ /* Add option 82 */
+ o->option = 82; /* option 82 */
+ o->length = 12; /* 12 octets to follow */
+ o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */
+ o->data[1] = 4; /* length of suboption */
+ u32 *o_ifid = (u32 *) & o->data[2];
+ *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
+ o->data[6] = 5; /* suboption 5 (client RX intfc address) */
+ o->data[7] = 4; /* length 4 */
+ u32 *o_addr = (u32 *) & o->data[8];
+ *o_addr = ia0->as_u32;
+ o->data[12] = DHCP_PACKET_OPTION_END;
+
+ vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
+ if (vss)
+ {
+ u32 id_len; /* length of VPN ID */
+
+ if (vss->vss_type == VSS_TYPE_VPN_ID)
+ {
+ id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */
+ memcpy (&o->data[15], vss->vpn_id, id_len);
+ }
+ else if (vss->vss_type == VSS_TYPE_ASCII)
+ {
+ id_len = vec_len (vss->vpn_ascii_id);
+ memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
+ }
+ else /* must be VSS_TYPE_DEFAULT, no VPN ID */
+ id_len = 0;
+
+ o->data[12] = 151; /* vss suboption */
+ o->data[13] = id_len + 1; /* length: vss_type + id_len */
+ o->data[14] = vss->vss_type; /* vss option type */
+ o->data[15 + id_len] = 152; /* vss control suboption */
+ o->data[16 + id_len] = 0; /* length */
+ o->data[17 + id_len] = DHCP_PACKET_OPTION_END; /* "end-of-options" (0xFF) */
+ /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
+ o->length += id_len + 5;
+ }
+
+ len = o->length + 3;
+ b0->current_length += len;
+ /* Fix IP header length and checksum */
+ old_l0 = ip0->length;
+ new_l0 = clib_net_to_host_u16 (old_l0);
+ new_l0 += len;
+ new_l0 = clib_host_to_net_u16 (new_l0);
+ ip0->length = new_l0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+ length /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ /* Fix UDP length */
+ new_l0 = clib_net_to_host_u16 (u0->length);
+ new_l0 += len;
+ u0->length = clib_host_to_net_u16 (new_l0);
+ }
+ else
+ {
+ vlib_node_increment_counter
+ (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
+ }
+
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
+
+ /*
+ * If we have multiple servers configured and this is the
+ * client's discover message, then send copies to each of
+ * those servers
+ */
+ if (is_discover && vec_len (proxy->dhcp_servers) > 1)
+ {
+ u32 ii;
+
+ for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
+ {
+ vlib_buffer_t *c0;
+ u32 ci0;
+
+ c0 = vlib_buffer_copy (vm, b0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
+ ci0 = vlib_get_buffer_index (vm, c0);
+ server = &proxy->dhcp_servers[ii];
+
+ ip0 = vlib_buffer_get_current (c0);
+
+ sum0 = ip0->checksum;
+ old0 = ip0->dst_address.as_u32;
+ new0 = server->dhcp_server.ip4.as_u32;
+ ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
+ sum0 = ip_csum_update (sum0, old0, new0,
+ ip4_header_t /* structure */ ,
+ dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ to_next[0] = ci0;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ ci0, next0);
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ dhcp_proxy_trace_t *tr;
+
+ tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
+ tr->which = 0; /* to server */
+ tr->error = error0;
+ tr->original_sw_if_index = original_sw_if_index;
+ tr->sw_if_index = sw_if_index;
+ if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
+ tr->trace_ip4_address.as_u32 =
+ server->dhcp_server.ip4.as_u32;
+ }
+
+ if (PREDICT_FALSE (0 == n_left_to_next))
+ {
+ vlib_put_next_frame (vm, node, next_index,
+ n_left_to_next);
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+ }
+ }
+ }
+ do_trace:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->which = 0; /* to server */
+ tr->error = error0;
+ tr->original_sw_if_index = original_sw_if_index;
+ tr->sw_if_index = sw_if_index;
+ if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
+ tr->trace_ip4_address.as_u32 =
+ proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
+ }
+
+ do_enqueue:
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
+ pkts_to_client);
+ vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_RELAY_TO_SERVER,
+ pkts_to_server);
+ vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
+ vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
+ pkts_no_interface_address);
+ vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
+ DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
+ return from_frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
+ .function = dhcp_proxy_to_server_input,
+ .name = "dhcp-proxy-to-server",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = DHCP_PROXY_N_ERROR,
+ .error_strings = dhcp_proxy_error_strings,
+
+ .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
+ foreach_dhcp_proxy_to_server_input_next
+#undef _
+ },
+
+ .format_buffer = format_dhcp_proxy_header_with_length,
+ .format_trace = format_dhcp_proxy_trace,
+#if 0
+ .unformat_buffer = unformat_dhcp_proxy_header,
+#endif
+};
+/* *INDENT-ON* */
+
+static uword
+dhcp_proxy_to_client_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, *from;
+ ethernet_main_t *em = vnet_get_ethernet_main ();
+ dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
+ vnet_main_t *vnm = vnet_get_main ();
+ ip4_main_t *im = &ip4_main;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ udp_header_t *u0;
+ dhcp_header_t *h0;
+ ip4_header_t *ip0 = 0;
+ ip4_address_t *ia0 = 0;
+ u32 old0, new0;
+ ip_csum_t sum0;
+ ethernet_interface_t *ei0;
+ ethernet_header_t *mac0;
+ vnet_hw_interface_t *hi0;
+ vlib_frame_t *f0;
+ u32 *to_next0;
+ u32 sw_if_index = ~0;
+ vnet_sw_interface_t *si0;
+ u32 error0 = (u32) ~ 0;
+ vnet_sw_interface_t *swif;
+ u32 fib_index;
+ dhcp_proxy_t *proxy;
+ dhcp_server_t *server;
+ u32 original_sw_if_index = (u32) ~ 0;
+ ip4_address_t relay_addr = {
+ .as_u32 = 0,
+ };
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ h0 = vlib_buffer_get_current (b0);
+
+ /*
+ * udp_local hands us the DHCP header, need udp hdr,
+ * ip hdr to relay to client
+ */
+ vlib_buffer_advance (b0, -(sizeof (*u0)));
+ u0 = vlib_buffer_get_current (b0);
+
+ vlib_buffer_advance (b0, -(sizeof (*ip0)));
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* Consumed by dhcp client code? */
+ if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
+ continue;
+
+ if (1 /* dpm->insert_option_82 */ )
+ {
+ /* linearize needed to "unclone" and scan options */
+ int rv = vlib_buffer_chain_linearize (vm, b0);
+ if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || !rv)
+ {
+ error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
+ goto drop_packet;
+ }
+
+ dhcp_option_t *o = h0->options, *end =
+ (void *) vlib_buffer_get_tail (b0);
+
+ /* Parse through TLVs looking for option 82.
+ The circuit-ID is the FIB number we need
+ to track down the client-facing interface */
+
+ while (o->option != DHCP_PACKET_OPTION_END && o < end)
+ {
+ if (o->option == 82)
+ {
+ u32 vss_exist = 0;
+ u32 vss_ctrl = 0;
+ dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
+ dhcp_option_t *subend =
+ (dhcp_option_t *) (o->data + o->length);
+ while (sub->option != DHCP_PACKET_OPTION_END
+ && sub < subend)
+ {
+ /* If this is one of ours, it will have
+ total length 12, circuit-id suboption type,
+ and the sw_if_index */
+ if (sub->option == 1 && sub->length == 4)
+ {
+ sw_if_index = ((sub->data[0] << 24) |
+ (sub->data[1] << 16) |
+ (sub->data[2] << 8) |
+ (sub->data[3]));
+ }
+ else if (sub->option == 5 && sub->length == 4)
+ {
+ relay_addr.as_u8[0] = sub->data[0];
+ relay_addr.as_u8[1] = sub->data[1];
+ relay_addr.as_u8[2] = sub->data[2];
+ relay_addr.as_u8[3] = sub->data[3];
+ }
+ else if (sub->option == 151 &&
+ sub->length == 7 && sub->data[0] == 1)
+ vss_exist = 1;
+ else if (sub->option == 152 && sub->length == 0)
+ vss_ctrl = 1;
+ sub = (dhcp_option_t *) (sub->data + sub->length);
+ }
+ if (vss_ctrl && vss_exist)
+ vlib_node_increment_counter
+ (vm, dhcp_proxy_to_client_node.index,
+ DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
+
+ }
+ o = (dhcp_option_t *) (o->data + o->length);
+ }
+ }
+
+ if (sw_if_index == (u32) ~ 0)
+ {
+ error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
+
+ drop_packet:
+ vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
+ error0, 1);
+ f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
+ to_next0 = vlib_frame_vector_args (f0);
+ to_next0[0] = bi0;
+ f0->n_vectors = 1;
+ vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
+ goto do_trace;
+ }
+
+ if (relay_addr.as_u32 == 0)
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
+ goto drop_packet;
+ }
+
+ if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
+ goto drop_packet;
+ }
+
+ fib_index = im->fib_index_by_sw_if_index[sw_if_index];
+ proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
+
+ if (PREDICT_FALSE (NULL == proxy))
+ {
+ error0 = DHCP_PROXY_ERROR_NO_SERVER;
+ goto drop_packet;
+ }
+
+ vec_foreach (server, proxy->dhcp_servers)
+ {
+ if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
+ {
+ goto server_found;
+ }
+ }
+
+ error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
+ goto drop_packet;
+
+ server_found:
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
+
+ swif = vnet_get_sw_interface (vnm, sw_if_index);
+ original_sw_if_index = sw_if_index;
+ if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
+ sw_if_index = swif->unnumbered_sw_if_index;
+
+ ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
+ if (ia0 == 0)
+ {
+ error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
+ goto drop_packet;
+ }
+
+ if (relay_addr.as_u32 != ia0->as_u32)
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
+ goto drop_packet;
+ }
+
+ u0->checksum = 0;
+ u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
+ sum0 = ip0->checksum;
+ old0 = ip0->dst_address.as_u32;
+ new0 = 0xFFFFFFFF;
+ ip0->dst_address.as_u32 = new0;
+ sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
+ dst_address /* offset of changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ sum0 = ip0->checksum;
+ old0 = ip0->src_address.as_u32;
+ new0 = ia0->as_u32;
+ ip0->src_address.as_u32 = new0;
+ sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
+ src_address /* offset of changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
+ si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
+ if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
+ vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
+
+ mac0 = vlib_buffer_get_current (b0);
+
+ hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
+ ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
+ clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
+ clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
+ mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
+ clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);
+
+ if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
+ {
+ u32 *vlan_tag = (u32 *) (mac0 + 1);
+ u32 tmp;
+ tmp = (si0->sub.id << 16) | 0x0800;
+ *vlan_tag = clib_host_to_net_u32 (tmp);
+ }
+
+ /* $$$ This needs to be rewritten, for sure */
+ f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
+ to_next0 = vlib_frame_vector_args (f0);
+ to_next0[0] = bi0;
+ f0->n_vectors = 1;
+ vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
+
+ do_trace:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->which = 1; /* to client */
+ tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
+ tr->error = error0;
+ tr->original_sw_if_index = original_sw_if_index;
+ tr->sw_if_index = sw_if_index;
+ }
+ }
+
+ return from_frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
+ .function = dhcp_proxy_to_client_input,
+ .name = "dhcp-proxy-to-client",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = DHCP_PROXY_N_ERROR,
+ .error_strings = dhcp_proxy_error_strings,
+ .format_buffer = format_dhcp_proxy_header_with_length,
+ .format_trace = format_dhcp_proxy_trace,
+#if 0
+ .unformat_buffer = unformat_dhcp_proxy_header,
+#endif
+};
+/* *INDENT-ON* */
+
+void
+dhcp_maybe_register_udp_ports (dhcp_port_reg_flags_t ports)
+{
+ dhcp_proxy_main_t *dm = &dhcp_proxy_main;
+ vlib_main_t *vm = dm->vlib_main;
+ int port_regs_diff = dm->udp_ports_registered ^ ports;
+
+ if (!port_regs_diff)
+ return;
+
+ if ((port_regs_diff & DHCP_PORT_REG_CLIENT) & ports)
+ udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
+ dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );
+
+ if ((port_regs_diff & DHCP_PORT_REG_SERVER) & ports)
+ udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
+ dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );
+
+ dm->udp_ports_registered |= ports;
+}
+
+static clib_error_t *
+dhcp4_proxy_init (vlib_main_t * vm)
+{
+ dhcp_proxy_main_t *dm = &dhcp_proxy_main;
+ vlib_node_t *error_drop_node;
+
+ error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
+ dm->error_drop_node_index = error_drop_node->index;
+ dm->vlib_main = vm;
+
+ return 0;
+}
+
+
+VLIB_INIT_FUNCTION (dhcp4_proxy_init);
+
+int
+dhcp4_proxy_set_server (ip46_address_t * addr,
+ ip46_address_t * src_addr,
+ u32 rx_table_id, u32 server_table_id, int is_del)
+{
+ u32 rx_fib_index = 0;
+ int rc = 0;
+
+ const fib_prefix_t all_1s = {
+ .fp_len = 32,
+ .fp_addr.ip4.as_u32 = 0xffffffff,
+ .fp_proto = FIB_PROTOCOL_IP4,
+ };
+
+ if (ip46_address_is_zero (addr))
+ return VNET_API_ERROR_INVALID_DST_ADDRESS;
+
+ if (ip46_address_is_zero (src_addr))
+ return VNET_API_ERROR_INVALID_SRC_ADDRESS;
+
+ dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT | DHCP_PORT_REG_SERVER);
+
+ rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
+ rx_table_id,
+ FIB_SOURCE_DHCP);
+
+ if (is_del)
+ {
+ if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
+ addr, server_table_id))
+ {
+ fib_table_entry_special_remove (rx_fib_index,
+ &all_1s, FIB_SOURCE_DHCP);
+ fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
+ }
+ }
+ else
+ {
+ if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
+ addr, src_addr,
+ rx_fib_index, server_table_id))
+ {
+ fib_table_entry_special_add (rx_fib_index,
+ &all_1s,
+ FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL);
+ fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
+ }
+ }
+ fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
+
+ return (rc);
+}
+
+static clib_error_t *
+dhcp4_proxy_set_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ ip46_address_t server_addr, src_addr;
+ u32 server_table_id = 0, rx_table_id = 0;
+ int is_del = 0;
+ int set_src = 0, set_server = 0;
+
+ clib_memset (&server_addr, 0, sizeof (server_addr));
+ clib_memset (&src_addr, 0, sizeof (src_addr));
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "server %U",
+ unformat_ip4_address, &server_addr.ip4))
+ set_server = 1;
+ else if (unformat (input, "server-fib-id %d", &server_table_id))
+ ;
+ else if (unformat (input, "rx-fib-id %d", &rx_table_id))
+ ;
+ else if (unformat (input, "src-address %U",
+ unformat_ip4_address, &src_addr.ip4))
+ set_src = 1;
+ else if (unformat (input, "delete") || unformat (input, "del"))
+ is_del = 1;
+ else
+ break;
+ }
+
+ if (is_del || (set_server && set_src))
+ {
+ int rv;
+
+ rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
+ server_table_id, is_del);
+ switch (rv)
+ {
+ case 0:
+ return 0;
+
+ case VNET_API_ERROR_INVALID_DST_ADDRESS:
+ return clib_error_return (0, "Invalid server address");
+
+ case VNET_API_ERROR_INVALID_SRC_ADDRESS:
+ return clib_error_return (0, "Invalid src address");
+
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ return clib_error_return
+ (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
+
+ default:
+ return clib_error_return (0, "BUG: rv %d", rv);
+ }
+ }
+ else
+ return clib_error_return (0, "parse error`%U'",
+ format_unformat_error, input);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
+ .path = "set dhcp proxy",
+ .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
+ .function = dhcp4_proxy_set_command_fn,
+};
+/* *INDENT-ON* */
+
+static u8 *
+format_dhcp4_proxy_server (u8 * s, va_list * args)
+{
+ dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
+ ip4_fib_t *rx_fib, *server_fib;
+ dhcp_server_t *server;
+
+ if (proxy == 0)
+ {
+ s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
+ "Servers FIB,Address");
+ return s;
+ }
+
+ rx_fib = ip4_fib_get (proxy->rx_fib_index);
+
+ s = format (s, "%=14u%=16U",
+ rx_fib->table_id,
+ format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
+
+ vec_foreach (server, proxy->dhcp_servers)
+ {
+ server_fib = ip4_fib_get (server->server_fib_index);
+ s = format (s, "%u,%U ",
+ server_fib->table_id,
+ format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
+ }
+ return s;
+}
+
+static int
+dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx)
+{
+ vlib_main_t *vm = ctx;
+
+ vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
+
+ return (1);
+}
+
+static clib_error_t *
+dhcp4_proxy_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ vlib_cli_output (vm, "%U", format_dhcp4_proxy_server,
+ NULL /* header line */ );
+
+ dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
+ .path = "show dhcp proxy",
+ .short_help = "Display dhcp proxy server info",
+ .function = dhcp4_proxy_show_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+dhcp_option_82_vss_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
+ u32 oui = 0, fib_id = 0, tbl_id = ~0;
+ u8 *vpn_ascii_id = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "table %d", &tbl_id))
+ ;
+ else if (unformat (input, "oui %d", &oui))
+ vss_type = VSS_TYPE_VPN_ID;
+ else if (unformat (input, "vpn-id %d", &fib_id))
+ vss_type = VSS_TYPE_VPN_ID;
+ else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
+ vss_type = VSS_TYPE_ASCII;
+ else if (unformat (input, "delete") || unformat (input, "del"))
+ is_del = 1;
+ else
+ break;
+ }
+
+ if (tbl_id == ~0)
+ return clib_error_return (0, "no table ID specified.");
+
+ int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
+ vpn_ascii_id, oui, fib_id, is_del);
+ switch (rv)
+ {
+ case 0:
+ return 0;
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ return clib_error_return (0,
+ "option 82 vss for table %d not found in in pool.",
+ tbl_id);
+ default:
+ return clib_error_return (0, "BUG: rv %d", rv);
+
+ }
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
+ .path = "set dhcp option-82 vss",
+ .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
+ .function = dhcp_option_82_vss_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+dhcp_vss_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
+ .path = "show dhcp vss",
+ .short_help = "show dhcp VSS",
+ .function = dhcp_vss_show_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ u32 sw_if_index0 = 0, sw_if_index;
+ vnet_sw_interface_t *swif;
+ ip4_address_t *ia0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+
+ if (unformat (input, "%U",
+ unformat_vnet_sw_interface, vnm, &sw_if_index0))
+ {
+ swif = vnet_get_sw_interface (vnm, sw_if_index0);
+ sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
+ swif->unnumbered_sw_if_index : sw_if_index0;
+ ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
+ if (ia0)
+ {
+ vlib_cli_output (vm, "%=20s%=20s", "interface",
+ "source IP address");
+
+ vlib_cli_output (vm, "%=20U%=20U",
+ format_vnet_sw_if_index_name,
+ vnm, sw_if_index0, format_ip4_address, ia0);
+ }
+ else
+ vlib_cli_output (vm, "%=34s %=20U",
+ "No IPv4 address configured on",
+ format_vnet_sw_if_index_name, vnm, sw_if_index);
+ }
+ else
+ break;
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
+ .path = "show dhcp option-82-address interface",
+ .short_help = "show dhcp option-82-address interface <interface>",
+ .function = dhcp_option_82_address_show_command_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */