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-rw-r--r--src/vnet/udp/udp_inlines.h231
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diff --git a/src/vnet/udp/udp_inlines.h b/src/vnet/udp/udp_inlines.h
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+/*
+ * Copyright (c) 2020 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.
+ */
+
+#ifndef SRC_VNET_UDP_UDP_INLINES_H_
+#define SRC_VNET_UDP_UDP_INLINES_H_
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip4.h>
+#include <vnet/ip/ip6.h>
+#include <vnet/udp/udp_packet.h>
+
+always_inline void *
+vlib_buffer_push_udp (vlib_buffer_t * b, u16 sp, u16 dp, u8 offload_csum)
+{
+ udp_header_t *uh;
+ u16 udp_len = sizeof (udp_header_t) + b->current_length;
+ if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
+ udp_len += b->total_length_not_including_first_buffer;
+
+ uh = vlib_buffer_push_uninit (b, sizeof (udp_header_t));
+ uh->src_port = sp;
+ uh->dst_port = dp;
+ uh->checksum = 0;
+ uh->length = clib_host_to_net_u16 (udp_len);
+ if (offload_csum)
+ b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+ vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
+ b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID;
+ return uh;
+}
+
+always_inline void
+ip_udp_fixup_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 is_ip4)
+{
+ u16 new_l0;
+ udp_header_t *udp0;
+
+ if (is_ip4)
+ {
+ ip4_header_t *ip0;
+ ip_csum_t sum0;
+ u16 old_l0 = 0;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* fix the <bleep>ing outer-IP checksum */
+ sum0 = ip0->checksum;
+ /* old_l0 always 0, see the rewrite setup */
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+
+ sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+ length /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+ ip0->length = new_l0;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *) (ip0 + 1);
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
+ - sizeof (*ip0));
+ udp0->length = new_l0;
+ }
+ else
+ {
+ ip6_header_t *ip0;
+ int bogus0;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
+ - sizeof (*ip0));
+ ip0->payload_length = new_l0;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *) (ip0 + 1);
+ udp0->length = new_l0;
+
+ udp0->checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
+ ASSERT (bogus0 == 0);
+
+ if (udp0->checksum == 0)
+ udp0->checksum = 0xffff;
+ }
+}
+
+always_inline void
+ip_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len,
+ u8 is_ip4)
+{
+ vlib_buffer_advance (b0, -ec_len);
+
+ if (is_ip4)
+ {
+ ip4_header_t *ip0;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* Apply the encap string. */
+ clib_memcpy_fast (ip0, ec0, ec_len);
+ ip_udp_fixup_one (vm, b0, 1);
+ }
+ else
+ {
+ ip6_header_t *ip0;
+
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* Apply the encap string. */
+ clib_memcpy_fast (ip0, ec0, ec_len);
+ ip_udp_fixup_one (vm, b0, 0);
+ }
+}
+
+always_inline void
+ip_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1,
+ u8 * ec0, u8 * ec1, word ec_len, u8 is_v4)
+{
+ u16 new_l0, new_l1;
+ udp_header_t *udp0, *udp1;
+
+ ASSERT (_vec_len (ec0) == _vec_len (ec1));
+
+ vlib_buffer_advance (b0, -ec_len);
+ vlib_buffer_advance (b1, -ec_len);
+
+ if (is_v4)
+ {
+ ip4_header_t *ip0, *ip1;
+ ip_csum_t sum0, sum1;
+ u16 old_l0 = 0, old_l1 = 0;
+
+ ip0 = vlib_buffer_get_current (b0);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* Apply the encap string */
+ clib_memcpy_fast (ip0, ec0, ec_len);
+ clib_memcpy_fast (ip1, ec1, ec_len);
+
+ /* fix the <bleep>ing outer-IP checksum */
+ sum0 = ip0->checksum;
+ sum1 = ip1->checksum;
+
+ /* old_l0 always 0, see the rewrite setup */
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+ new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
+
+ sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
+ length /* changed member */ );
+ sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
+ length /* changed member */ );
+
+ ip0->checksum = ip_csum_fold (sum0);
+ ip1->checksum = ip_csum_fold (sum1);
+
+ ip0->length = new_l0;
+ ip1->length = new_l1;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *) (ip0 + 1);
+ udp1 = (udp_header_t *) (ip1 + 1);
+
+ new_l0 =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
+ sizeof (*ip0));
+ new_l1 =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) -
+ sizeof (*ip1));
+ udp0->length = new_l0;
+ udp1->length = new_l1;
+ }
+ else
+ {
+ ip6_header_t *ip0, *ip1;
+ int bogus0, bogus1;
+
+ ip0 = vlib_buffer_get_current (b0);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* Apply the encap string. */
+ clib_memcpy_fast (ip0, ec0, ec_len);
+ clib_memcpy_fast (ip1, ec1, ec_len);
+
+ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
+ - sizeof (*ip0));
+ new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
+ - sizeof (*ip1));
+ ip0->payload_length = new_l0;
+ ip1->payload_length = new_l1;
+
+ /* Fix UDP length */
+ udp0 = (udp_header_t *) (ip0 + 1);
+ udp1 = (udp_header_t *) (ip1 + 1);
+
+ udp0->length = new_l0;
+ udp1->length = new_l1;
+
+ udp0->checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
+ udp1->checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1);
+ ASSERT (bogus0 == 0);
+ ASSERT (bogus1 == 0);
+
+ if (udp0->checksum == 0)
+ udp0->checksum = 0xffff;
+ if (udp1->checksum == 0)
+ udp1->checksum = 0xffff;
+ }
+}
+
+#endif /* SRC_VNET_UDP_UDP_INLINES_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */