--- /dev/null
+/*
+ * 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 <vnet/dhcp/proxy.h>
+
+static char * dhcp_proxy_error_strings[] = {
+#define dhcp_proxy_error(n,s) s,
+#include "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)
+
+vlib_node_registration_t dhcp_proxy_to_server_node;
+vlib_node_registration_t dhcp_proxy_to_client_node;
+
+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;
+}
+
+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;
+}
+
+/* get first interface address */
+static ip4_address_t *
+ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index)
+{
+ ip_lookup_main_t * lm = &im->lookup_main;
+ ip_interface_address_t * ia = 0;
+ ip4_address_t * result = 0;
+
+ foreach_ip_interface_address (lm, ia, sw_if_index,
+ 1 /* honor unnumbered */,
+ ({
+ ip4_address_t * a = ip_interface_address_get_address (lm, ia);
+ result = a;
+ break;
+ }));
+ return result;
+}
+
+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;
+ u8 *end = NULL;
+ u32 fib_index, server_index;
+ dhcp_server_t * server;
+ u32 rx_sw_if_index;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 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];
+
+ if (fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
+ server_index = dpm->dhcp_server_index_by_rx_fib_index[fib_index];
+ else
+ server_index = 0;
+
+ if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp_servers,
+ server_index)))
+ {
+ no_server:
+ error0 = DHCP_PROXY_ERROR_NO_SERVER;
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_no_server++;
+ goto do_trace;
+ }
+
+ server = pool_elt_at_index (dpm->dhcp_servers, server_index);
+ if (server->valid == 0)
+ goto no_server;
+
+ 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.as_u32;
+ ip0->dst_address.as_u32 = server->dhcp_server.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 = server->dhcp_src_address.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.as_u32 = server->dhcp_src_address.as_u32;
+ pkts_to_server++;
+
+ if (server->insert_option_82)
+ {
+ u32 fib_index, fib_id, opt82_fib_id=0, opt82_oui=0;
+ ip4_fib_t * fib;
+ dhcp_option_t *o = (dhcp_option_t *) h0->options;
+ u32 len = 0;
+ vlib_buffer_free_list_t *fl;
+
+ fib_index = im->fib_index_by_sw_if_index
+ [vnet_buffer(b0)->sw_if_index[VLIB_RX]];
+ fib = vec_elt_at_index (im->fibs, fib_index);
+ fib_id = fib->table_id;
+
+ end = b0->data + b0->current_data + b0->current_length;
+ /* TLVs are not performance-friendly... */
+ while (o->option != 0xFF /* end of options */ && (u8 *)o < end)
+ o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
+
+ fl = vlib_buffer_get_free_list (vm, b0->free_list_index);
+ // start write at (option*)o, some packets have padding
+ if (((u8 *)o - (u8 *)b0->data + VPP_DHCP_OPTION82_SIZE) > fl->n_data_bytes)
+ {
+ next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
+ pkts_too_big++;
+ goto do_trace;
+ }
+
+ if ((o->option == 0xFF) && ((u8 *)o <= end))
+ {
+ vnet_main_t *vnm = vnet_get_main();
+ u16 old_l0, new_l0;
+ ip4_address_t _ia0, * ia0 = &_ia0;
+ uword *p_vss;
+ vss_info *vss;
+ vnet_sw_interface_t *swif;
+ sw_if_index = 0;
+ original_sw_if_index = 0;
+
+ 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;
+
+ p_vss = hash_get (dpm->opt82vss_index_by_vrf_id,
+ fib_id);
+ if (p_vss)
+ {
+ vss = pool_elt_at_index (dpm->opt82vss, p_vss[0]);
+ opt82_oui = vss->vpn_id.oui;
+ opt82_fib_id = vss->vpn_id.fib_id;
+ }
+ /*
+ * 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);
+
+ 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 */
+ o->data[2] = (original_sw_if_index >> 24) & 0xFF;
+ o->data[3] = (original_sw_if_index >> 16) & 0xFF;
+ o->data[4] = (original_sw_if_index >> 8) & 0xFF;
+ o->data[5] = (original_sw_if_index >> 0) & 0xFF;
+ o->data[6] = 5; /* suboption 5 (client RX intfc address) */
+ o->data[7] = 4; /* length 4 */
+ o->data[8] = ia0->as_u8[0];
+ o->data[9] = ia0->as_u8[1];
+ o->data[10] = ia0->as_u8[2];
+ o->data[11] = ia0->as_u8[3];
+ o->data[12] = 0xFF;
+ if (opt82_oui !=0 || opt82_fib_id != 0)
+ {
+ o->data[12] = 151; /* vss suboption */
+ if (255 == opt82_fib_id) {
+ o->data[13] = 1; /* length */
+ o->data[14] = 255; /* vss option type */
+ o->data[15] = 152; /* vss control suboption */
+ o->data[16] = 0; /* length */
+ /* and a new "end-of-options" option (0xff) */
+ o->data[17] = 0xFF;
+ o->length += 5;
+ } else {
+ o->data[13] = 8; /* length */
+ o->data[14] = 1; /* vss option type */
+ o->data[15] = (opt82_oui >> 16) & 0xff;
+ o->data[16] = (opt82_oui >> 8) & 0xff;
+ o->data[17] = (opt82_oui ) & 0xff;
+ o->data[18] = (opt82_fib_id >> 24) & 0xff;
+ o->data[19] = (opt82_fib_id >> 16) & 0xff;
+ o->data[20] = (opt82_fib_id >> 8) & 0xff;
+ o->data[21] = (opt82_fib_id) & 0xff;
+ o->data[22] = 152; /* vss control suboption */
+ o->data[23] = 0; /* length */
+
+ /* and a new "end-of-options" option (0xff) */
+ o->data[24] = 0xFF;
+ o->length += 12;
+ }
+ }
+
+ 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;
+
+ 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 = server->dhcp_server.as_u32;
+ }
+
+ do_enqueue:
+ 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;
+}
+
+VLIB_REGISTER_NODE (dhcp_proxy_to_server_node) = {
+ .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
+};
+
+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 = ethernet_get_main (vm);
+ 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 server_index;
+ u32 fib_index;
+ dhcp_server_t * server;
+ u32 original_sw_if_index = (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 */)
+ {
+ dhcp_option_t *o = (dhcp_option_t *) h0->options;
+ dhcp_option_t *sub;
+
+ /* 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 != 0xFF /* end of options */ &&
+ (u8 *) o < (b0->data + b0->current_data + b0->current_length))
+ {
+ if (o->option == 82)
+ {
+ u32 vss_exist = 0;
+ u32 vss_ctrl = 0;
+ sub = (dhcp_option_t *) &o->data[0];
+ while (sub->option != 0xFF /* end of options */ &&
+ (u8 *) sub < (u8 *)(o + o->length)) {
+ /* 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 = (o->data[2] << 24)
+ | (o->data[3] << 16)
+ | (o->data[4] << 8)
+ | (o->data[5]);
+ } 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 *)
+ (((uword) sub) + (sub->length + 2));
+ }
+ 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 *) (((uword) o) + (o->length + 2));
+ }
+ }
+
+ 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 (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_OPTION_82;
+ goto drop_packet;
+ }
+
+ fib_index = im->fib_index_by_sw_if_index [sw_if_index];
+
+ if (fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
+ server_index = dpm->dhcp_server_index_by_rx_fib_index[fib_index];
+ else
+ server_index = 0;
+
+ if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp_servers,
+ server_index)))
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_OPTION_82;
+ goto drop_packet;
+ }
+
+ server = pool_elt_at_index (dpm->dhcp_servers, server_index);
+ if (server->valid == 0)
+ {
+ error0 = DHCP_PROXY_ERROR_NO_SERVER;
+ goto drop_packet;
+ }
+
+ if (ip0->src_address.as_u32 != server->dhcp_server.as_u32)
+ {
+ error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
+ goto drop_packet;
+ }
+
+ 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);
+ if (ia0 == 0)
+ {
+ error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
+ 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);
+ memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
+ 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;
+}
+
+VLIB_REGISTER_NODE (dhcp_proxy_to_client_node) = {
+ .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
+};
+
+clib_error_t * dhcp_proxy_init (vlib_main_t * vm)
+{
+ dhcp_proxy_main_t * dm = &dhcp_proxy_main;
+ vlib_node_t * error_drop_node;
+ dhcp_server_t * server;
+
+ dm->vlib_main = vm;
+ dm->vnet_main = vnet_get_main();
+ error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
+ dm->error_drop_node_index = error_drop_node->index;
+
+ dm->opt82vss_index_by_vrf_id = hash_create (0, sizeof (uword));
+
+ udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
+ dhcp_proxy_to_client_node.index, 1 /* is_ip4 */);
+
+ udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
+ dhcp_proxy_to_server_node.index, 1 /* is_ip4 */);
+
+ /* Create the default server, don't mark it valid */
+ pool_get (dm->dhcp_servers, server);
+ memset (server, 0, sizeof (*server));
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (dhcp_proxy_init);
+
+int dhcp_proxy_set_server_2 (ip4_address_t *addr, ip4_address_t *src_address,
+ u32 rx_fib_id,
+ u32 server_fib_id,
+ int insert_option_82, int is_del)
+{
+ dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
+ ip4_main_t * im = &ip4_main;
+ dhcp_server_t * server = 0;
+ ip4_fib_t *rx_fib, *server_fib;
+ u32 server_index = 0;
+ u32 rx_fib_index = 0;
+
+ if (addr->as_u32 == 0)
+ return VNET_API_ERROR_INVALID_DST_ADDRESS;
+
+ if (src_address->as_u32 == 0)
+ return VNET_API_ERROR_INVALID_SRC_ADDRESS;
+
+ rx_fib = find_ip4_fib_by_table_index_or_id
+ (&ip4_main, rx_fib_id, IP4_ROUTE_FLAG_TABLE_ID);
+
+ if (rx_fib == 0)
+ return VNET_API_ERROR_NO_SUCH_INNER_FIB;
+
+ server_fib = find_ip4_fib_by_table_index_or_id
+ (&ip4_main, server_fib_id, IP4_ROUTE_FLAG_TABLE_ID);
+
+ if (server_fib == 0)
+ return VNET_API_ERROR_NO_SUCH_FIB;
+
+ if (rx_fib_id == 0)
+ {
+ server = pool_elt_at_index (dpm->dhcp_servers, 0);
+
+ if (is_del)
+ {
+ memset (server, 0, sizeof (*server));
+ return 0;
+ }
+ goto initialize_it;
+ }
+
+ rx_fib_index = rx_fib - im->fibs;
+
+ if (is_del)
+ {
+ if (rx_fib_index >= vec_len(dpm->dhcp_server_index_by_rx_fib_index))
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+ server_index = dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index];
+ ASSERT(server_index > 0);
+
+ /* Use the default server again. */
+ dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index] = 0;
+ server = pool_elt_at_index (dpm->dhcp_servers, server_index);
+ memset (server, 0, sizeof (*server));
+ pool_put (dpm->dhcp_servers, server);
+ return 0;
+ }
+
+ if (rx_fib_index < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
+ {
+ server_index = dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index];
+ if (server_index != 0)
+ {
+ server = pool_elt_at_index (dpm->dhcp_servers, server_index);
+ goto initialize_it;
+ }
+ }
+
+ pool_get (dpm->dhcp_servers, server);
+
+ initialize_it:
+
+ server->dhcp_server.as_u32 = addr->as_u32;
+ server->server_fib_index = server_fib - im->fibs;
+ server->dhcp_src_address.as_u32 = src_address->as_u32;
+ server->insert_option_82 = insert_option_82;
+ server->valid = 1;
+ if (rx_fib_index)
+ {
+ vec_validate (dpm->dhcp_server_index_by_rx_fib_index, rx_fib_index);
+ dpm->dhcp_server_index_by_rx_fib_index[rx_fib_index] =
+ server - dpm->dhcp_servers;
+ }
+
+ return 0;
+}
+
+/* Old API, manipulates the default server (only) */
+int dhcp_proxy_set_server (ip4_address_t *addr, ip4_address_t *src_address,
+ u32 fib_id, int insert_option_82, int is_del)
+{
+ return dhcp_proxy_set_server_2 (addr, src_address, 0 /* rx_fib_id */,
+ fib_id /* server_fib_id */,
+ insert_option_82, is_del);
+}
+
+
+static clib_error_t *
+dhcp_proxy_set_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ ip4_address_t server_addr, src_addr;
+ u32 server_fib_id = 0, rx_fib_id = 0;
+ int is_del = 0;
+ int add_option_82 = 0;
+ int set_src = 0, set_server = 0;
+
+ while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "server %U",
+ unformat_ip4_address, &server_addr))
+ set_server = 1;
+ else if (unformat (input, "server-fib-id %d", &server_fib_id))
+ ;
+ else if (unformat (input, "rx-fib-id %d", &rx_fib_id))
+ ;
+ else if (unformat(input, "src-address %U",
+ unformat_ip4_address, &src_addr))
+ set_src = 1;
+ else if (unformat (input, "add-option-82")
+ || unformat (input, "insert-option-82"))
+ add_option_82 = 1;
+ else if (unformat (input, "delete") ||
+ unformat (input, "del"))
+ is_del = 1;
+ else
+ break;
+ }
+
+ if (is_del || (set_server && set_src))
+ {
+ int rv;
+
+ rv = dhcp_proxy_set_server_2 (&server_addr, &src_addr, rx_fib_id,
+ server_fib_id, add_option_82, 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_INNER_FIB:
+ return clib_error_return (0, "No such rx fib id %d", rx_fib_id);
+
+ case VNET_API_ERROR_NO_SUCH_FIB:
+ return clib_error_return (0, "No such server fib id %d",
+ server_fib_id);
+
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ return clib_error_return
+ (0, "Fib id %d: no per-fib DHCP server configured", rx_fib_id);
+
+ default:
+ return clib_error_return (0, "BUG: rv %d", rv);
+ }
+ }
+ else
+ return clib_error_return (0, "parse error`%U'",
+ format_unformat_error, input);
+}
+
+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> [add-option-82] [server-fib-id <n>] [rx-fib-id <n>]",
+ .function = dhcp_proxy_set_command_fn,
+};
+
+u8 * format_dhcp_proxy_server (u8 * s, va_list * args)
+{
+ dhcp_proxy_main_t * dm = va_arg (*args, dhcp_proxy_main_t *);
+ dhcp_server_t * server = va_arg (*args, dhcp_server_t *);
+ u32 rx_fib_index = va_arg (*args, u32);
+ ip4_fib_t * rx_fib, * server_fib;
+ u32 server_fib_id = ~0, rx_fib_id = ~0;
+
+ if (dm == 0)
+ {
+ s = format (s, "%=16s%=16s%=14s%=14s%=20s", "Server", "Src Address",
+ "Server FIB", "RX FIB", "Insert Option 82");
+ return s;
+ }
+
+ server_fib = find_ip4_fib_by_table_index_or_id
+ (&ip4_main, server->server_fib_index, IP4_ROUTE_FLAG_FIB_INDEX);
+
+ if (server_fib)
+ server_fib_id = server_fib->table_id;
+
+ rx_fib = find_ip4_fib_by_table_index_or_id
+ (&ip4_main, rx_fib_index, IP4_ROUTE_FLAG_FIB_INDEX);
+
+ if (rx_fib)
+ rx_fib_id = rx_fib->table_id;
+
+ s = format (s, "%=16U%=16U%=14u%=14u%=20s",
+ format_ip4_address, &server->dhcp_server,
+ format_ip4_address, &server->dhcp_src_address,
+ server_fib_id, rx_fib_id,
+ server->insert_option_82 ? "yes" : "no");
+ return s;
+}
+
+static clib_error_t *
+dhcp_proxy_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
+ ip4_main_t * im = &ip4_main;
+ dhcp_server_t * server;
+ u32 server_index;
+ int i;
+
+ vlib_cli_output (vm, "%U", format_dhcp_proxy_server, 0 /* header line */,
+ 0, 0);
+
+ for (i = 0; i < vec_len (im->fibs); i++)
+ {
+ if (i < vec_len(dpm->dhcp_server_index_by_rx_fib_index))
+ server_index = dpm->dhcp_server_index_by_rx_fib_index[i];
+ else
+ server_index = 0;
+ server = pool_elt_at_index (dpm->dhcp_servers, server_index);
+ if (server->valid)
+ vlib_cli_output (vm, "%U", format_dhcp_proxy_server, dpm,
+ server, i);
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
+ .path = "show dhcp proxy",
+ .short_help = "Display dhcp proxy server info",
+ .function = dhcp_proxy_show_command_fn,
+};
+
+
+int dhcp_proxy_set_option82_vss( u32 vrf_id,
+ u32 oui,
+ u32 fib_id,
+ int is_del)
+{
+ dhcp_proxy_main_t *dm = &dhcp_proxy_main;
+ uword *p;
+ vss_info *a;
+ u32 old_oui=0, old_fib_id=0;
+
+ p = hash_get (dm->opt82vss_index_by_vrf_id, vrf_id);
+
+ if (p)
+ {
+ a = pool_elt_at_index (dm->opt82vss, p[0]);
+ if (!a)
+ return VNET_API_ERROR_NO_SUCH_FIB;
+ old_oui = a->vpn_id.oui;
+ old_fib_id = a->vpn_id.fib_id;
+
+ if (is_del)
+ {
+ if (old_oui == oui &&
+ old_fib_id == fib_id)
+ {
+ pool_put(dm->opt82vss, a);
+ hash_unset (dm->opt82vss_index_by_vrf_id, vrf_id);
+ return 0;
+ }
+ else
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+ }
+ pool_put(dm->opt82vss, a);
+ hash_unset (dm->opt82vss_index_by_vrf_id, vrf_id);
+ } else if (is_del)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+ pool_get (dm->opt82vss, a);
+ memset (a, ~0, sizeof (a[0]));
+ a->vpn_id.oui = oui;
+ a->vpn_id.fib_id = fib_id;
+ hash_set (dm->opt82vss_index_by_vrf_id, vrf_id, a - dm->opt82vss);
+
+ return 0;
+}
+
+static clib_error_t *
+dhcp_option_82_vss_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ int is_del = 0, got_new_vpn_id=0;
+ u32 oui=0, fib_id=0, tbl_id=~0;
+
+
+ while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
+ {
+
+ if (unformat(input, "delete") || unformat(input, "del"))
+ is_del = 1;
+ else if (unformat (input, "oui %d", &oui))
+ got_new_vpn_id = 1;
+ else if (unformat (input, "vpn-id %d", &fib_id))
+ got_new_vpn_id = 1;
+ else if (unformat (input, "table %d", &tbl_id))
+ got_new_vpn_id = 1;
+ else
+ break;
+ }
+ if (tbl_id == ~0)
+ return clib_error_return (0, "no table ID specified.");
+
+ if (is_del || got_new_vpn_id)
+ {
+ int rv;
+ rv = dhcp_proxy_set_option82_vss(tbl_id, oui, fib_id, is_del);
+ switch (rv)
+ {
+ case 0:
+ return 0;
+
+ case VNET_API_ERROR_NO_SUCH_FIB:
+ return clib_error_return (0, "option 82 vss(oui:%d, vpn-id:%d) not found in table %d",
+ oui, fib_id, tbl_id);
+
+ 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);
+ }
+ }
+ else
+ return clib_error_return (0, "parse error`%U'",
+ format_unformat_error, input);
+}
+
+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 <oui> vpn-id <vpn-id>",
+ .function = dhcp_option_82_vss_fn,
+};
+
+
+static clib_error_t *
+dhcp_vss_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+
+{
+ dhcp_proxy_main_t * dm = &dhcp_proxy_main;
+ vss_info *v;
+ u32 oui;
+ u32 fib_id;
+ u32 tbl_id;
+ uword index;
+
+ vlib_cli_output (vm, "%=9s%=11s%=12s","Table", "OUI", "VPN-ID");
+ hash_foreach (tbl_id, index, dm->opt82vss_index_by_vrf_id,
+ ({
+ v = pool_elt_at_index (dm->opt82vss, index);
+ oui = v->vpn_id.oui;
+ fib_id = v->vpn_id.fib_id;
+ vlib_cli_output (vm, "%=9d 0x%08x%=12d",
+ tbl_id, oui, fib_id);
+ }));
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
+ .path = "show dhcp vss",
+ .short_help = "show dhcp VSS",
+ .function = dhcp_vss_show_command_fn,
+};
+
+static clib_error_t *
+dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+
+{
+ dhcp_proxy_main_t *dm = &dhcp_proxy_main;
+ vnet_main_t *vnm = vnet_get_main();
+ u32 sw_if_index0=0, sw_if_index;
+ ip4_address_t *ia0;
+ vnet_sw_interface_t *swif;
+
+ while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
+ {
+
+ if (unformat(input, "%U",
+ unformat_vnet_sw_interface, dm->vnet_main, &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);
+ if (ia0)
+ {
+ vlib_cli_output (vm, "%=20s%=20s", "interface",
+ "source IP address");
+
+ vlib_cli_output (vm, "%=20U%=20U",
+ format_vnet_sw_if_index_name,
+ dm->vnet_main, 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,
+ dm->vnet_main, sw_if_index);
+ }
+ else
+ break;
+ }
+
+ return 0;
+}
+
+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,
+};
Code Review / vpp.git / blobdiff