--- /dev/null
+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * ip/ip4_pg: IP v4 packet-generator interface
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vnet/ip/ip.h>
+#include <vnet/pg/pg.h>
+
+#define IP4_PG_EDIT_CHECKSUM (1 << 0)
+#define IP4_PG_EDIT_LENGTH (1 << 1)
+
+static_always_inline void
+compute_length_and_or_checksum (vlib_main_t * vm,
+ u32 * packets,
+ u32 n_packets,
+ u32 ip_header_offset, u32 flags)
+{
+ ASSERT (flags != 0);
+
+ while (n_packets >= 2)
+ {
+ u32 pi0, pi1;
+ vlib_buffer_t *p0, *p1;
+ ip4_header_t *ip0, *ip1;
+ ip_csum_t sum0, sum1;
+
+ pi0 = packets[0];
+ pi1 = packets[1];
+ p0 = vlib_get_buffer (vm, pi0);
+ p1 = vlib_get_buffer (vm, pi1);
+ n_packets -= 2;
+ packets += 2;
+
+ ip0 = (void *) (p0->data + ip_header_offset);
+ ip1 = (void *) (p1->data + ip_header_offset);
+
+ if (flags & IP4_PG_EDIT_LENGTH)
+ {
+ ip0->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0) -
+ ip_header_offset);
+ ip1->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p1) -
+ ip_header_offset);
+ }
+
+ if (flags & IP4_PG_EDIT_CHECKSUM)
+ {
+ ASSERT (ip4_header_bytes (ip0) == sizeof (ip0[0]));
+ ASSERT (ip4_header_bytes (ip1) == sizeof (ip1[0]));
+
+ ip0->checksum = 0;
+ ip1->checksum = 0;
+
+ ip4_partial_header_checksum_x2 (ip0, ip1, sum0, sum1);
+ ip0->checksum = ~ip_csum_fold (sum0);
+ ip1->checksum = ~ip_csum_fold (sum1);
+
+ ASSERT (ip0->checksum == ip4_header_checksum (ip0));
+ ASSERT (ip1->checksum == ip4_header_checksum (ip1));
+ }
+ }
+
+ while (n_packets >= 1)
+ {
+ u32 pi0;
+ vlib_buffer_t *p0;
+ ip4_header_t *ip0;
+ ip_csum_t sum0;
+
+ pi0 = packets[0];
+ p0 = vlib_get_buffer (vm, pi0);
+ n_packets -= 1;
+ packets += 1;
+
+ ip0 = (void *) (p0->data + ip_header_offset);
+
+ if (flags & IP4_PG_EDIT_LENGTH)
+ ip0->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0) -
+ ip_header_offset);
+
+ if (flags & IP4_PG_EDIT_CHECKSUM)
+ {
+ ASSERT (ip4_header_bytes (ip0) == sizeof (ip0[0]));
+
+ ip0->checksum = 0;
+
+ ip4_partial_header_checksum_x1 (ip0, sum0);
+ ip0->checksum = ~ip_csum_fold (sum0);
+
+ ASSERT (ip0->checksum == ip4_header_checksum (ip0));
+ }
+ }
+}
+
+static void
+ip4_pg_edit_function (pg_main_t * pg,
+ pg_stream_t * s,
+ pg_edit_group_t * g, u32 * packets, u32 n_packets)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 ip_offset;
+
+ ip_offset = g->start_byte_offset;
+
+ switch (g->edit_function_opaque)
+ {
+ case IP4_PG_EDIT_LENGTH:
+ compute_length_and_or_checksum (vm, packets, n_packets, ip_offset,
+ IP4_PG_EDIT_LENGTH);
+ break;
+
+ case IP4_PG_EDIT_CHECKSUM:
+ compute_length_and_or_checksum (vm, packets, n_packets, ip_offset,
+ IP4_PG_EDIT_CHECKSUM);
+ break;
+
+ case IP4_PG_EDIT_LENGTH | IP4_PG_EDIT_CHECKSUM:
+ compute_length_and_or_checksum (vm, packets, n_packets, ip_offset,
+ IP4_PG_EDIT_LENGTH
+ | IP4_PG_EDIT_CHECKSUM);
+ break;
+
+ default:
+ ASSERT (0);
+ break;
+ }
+}
+
+typedef struct
+{
+ pg_edit_t ip_version, header_length;
+ pg_edit_t tos;
+ pg_edit_t length;
+
+ pg_edit_t fragment_id, fragment_offset;
+
+ /* Flags together with fragment offset. */
+ pg_edit_t mf_flag, df_flag, ce_flag;
+
+ pg_edit_t ttl;
+
+ pg_edit_t protocol;
+
+ pg_edit_t checksum;
+
+ pg_edit_t src_address, dst_address;
+} pg_ip4_header_t;
+
+static inline void
+pg_ip4_header_init (pg_ip4_header_t * p)
+{
+ /* Initialize fields that are not bit fields in the IP header. */
+#define _(f) pg_edit_init (&p->f, ip4_header_t, f);
+ _(tos);
+ _(length);
+ _(fragment_id);
+ _(ttl);
+ _(protocol);
+ _(checksum);
+ _(src_address);
+ _(dst_address);
+#undef _
+
+ /* Initialize bit fields. */
+ pg_edit_init_bitfield (&p->header_length, ip4_header_t,
+ ip_version_and_header_length, 0, 4);
+ pg_edit_init_bitfield (&p->ip_version, ip4_header_t,
+ ip_version_and_header_length, 4, 4);
+
+ pg_edit_init_bitfield (&p->fragment_offset, ip4_header_t,
+ flags_and_fragment_offset, 0, 13);
+ pg_edit_init_bitfield (&p->mf_flag, ip4_header_t,
+ flags_and_fragment_offset, 13, 1);
+ pg_edit_init_bitfield (&p->df_flag, ip4_header_t,
+ flags_and_fragment_offset, 14, 1);
+ pg_edit_init_bitfield (&p->ce_flag, ip4_header_t,
+ flags_and_fragment_offset, 15, 1);
+}
+
+uword
+unformat_pg_ip4_header (unformat_input_t * input, va_list * args)
+{
+ pg_stream_t *s = va_arg (*args, pg_stream_t *);
+ pg_ip4_header_t *p;
+ u32 group_index;
+
+ p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ip4_header_t),
+ &group_index);
+ pg_ip4_header_init (p);
+
+ /* Defaults. */
+ pg_edit_set_fixed (&p->ip_version, 4);
+ pg_edit_set_fixed (&p->header_length, sizeof (ip4_header_t) / sizeof (u32));
+
+ pg_edit_set_fixed (&p->tos, 0);
+ pg_edit_set_fixed (&p->ttl, 64);
+
+ pg_edit_set_fixed (&p->fragment_id, 0);
+ pg_edit_set_fixed (&p->fragment_offset, 0);
+ pg_edit_set_fixed (&p->mf_flag, 0);
+ pg_edit_set_fixed (&p->df_flag, 0);
+ pg_edit_set_fixed (&p->ce_flag, 0);
+
+ p->length.type = PG_EDIT_UNSPECIFIED;
+ p->checksum.type = PG_EDIT_UNSPECIFIED;
+
+ if (unformat (input, "%U: %U -> %U",
+ unformat_pg_edit,
+ unformat_ip_protocol, &p->protocol,
+ unformat_pg_edit,
+ unformat_ip4_address, &p->src_address,
+ unformat_pg_edit, unformat_ip4_address, &p->dst_address))
+ goto found;
+
+ if (!unformat (input, "%U:",
+ unformat_pg_edit, unformat_ip_protocol, &p->protocol))
+ goto error;
+
+found:
+ /* Parse options. */
+ while (1)
+ {
+ if (unformat (input, "version %U",
+ unformat_pg_edit, unformat_pg_number, &p->ip_version))
+ ;
+
+ else if (unformat (input, "header-length %U",
+ unformat_pg_edit,
+ unformat_pg_number, &p->header_length))
+ ;
+
+ else if (unformat (input, "tos %U",
+ unformat_pg_edit, unformat_pg_number, &p->tos))
+ ;
+
+ else if (unformat (input, "length %U",
+ unformat_pg_edit, unformat_pg_number, &p->length))
+ ;
+
+ else if (unformat (input, "checksum %U",
+ unformat_pg_edit, unformat_pg_number, &p->checksum))
+ ;
+
+ else if (unformat (input, "ttl %U",
+ unformat_pg_edit, unformat_pg_number, &p->ttl))
+ ;
+
+ else if (unformat (input, "fragment id %U offset %U",
+ unformat_pg_edit,
+ unformat_pg_number, &p->fragment_id,
+ unformat_pg_edit,
+ unformat_pg_number, &p->fragment_offset))
+ {
+ int i;
+ for (i = 0; i < ARRAY_LEN (p->fragment_offset.values); i++)
+ pg_edit_set_value (&p->fragment_offset, i,
+ pg_edit_get_value (&p->fragment_offset,
+ i) / 8);
+
+ }
+
+ /* Flags. */
+ else if (unformat (input, "mf") || unformat (input, "MF"))
+ pg_edit_set_fixed (&p->mf_flag, 1);
+
+ else if (unformat (input, "df") || unformat (input, "DF"))
+ pg_edit_set_fixed (&p->df_flag, 1);
+
+ else if (unformat (input, "ce") || unformat (input, "CE"))
+ pg_edit_set_fixed (&p->ce_flag, 1);
+
+ /* Can't parse input: try next protocol level. */
+ else
+ break;
+ }
+
+ {
+ ip_main_t *im = &ip_main;
+ ip_protocol_t protocol;
+ ip_protocol_info_t *pi;
+
+ pi = 0;
+ if (p->protocol.type == PG_EDIT_FIXED)
+ {
+ protocol = pg_edit_get_value (&p->protocol, PG_EDIT_LO);
+ pi = ip_get_protocol_info (im, protocol);
+ }
+
+ if (pi && pi->unformat_pg_edit
+ && unformat_user (input, pi->unformat_pg_edit, s))
+ ;
+
+ else if (!unformat_user (input, unformat_pg_payload, s))
+ goto error;
+
+ if (p->length.type == PG_EDIT_UNSPECIFIED
+ && s->min_packet_bytes == s->max_packet_bytes
+ && group_index + 1 < vec_len (s->edit_groups))
+ {
+ pg_edit_set_fixed (&p->length,
+ pg_edit_group_n_bytes (s, group_index));
+ }
+
+ /* Compute IP header checksum if all edits are fixed. */
+ if (p->checksum.type == PG_EDIT_UNSPECIFIED)
+ {
+ ip4_header_t fixed_header, fixed_mask, cmp_mask;
+
+ /* See if header is all fixed and specified except for
+ checksum field. */
+ memset (&cmp_mask, ~0, sizeof (cmp_mask));
+ cmp_mask.checksum = 0;
+
+ pg_edit_group_get_fixed_packet_data (s, group_index,
+ &fixed_header, &fixed_mask);
+ if (!memcmp (&fixed_mask, &cmp_mask, sizeof (cmp_mask)))
+ pg_edit_set_fixed (&p->checksum,
+ clib_net_to_host_u16 (ip4_header_checksum
+ (&fixed_header)));
+ }
+
+ p = pg_get_edit_group (s, group_index);
+ if (p->length.type == PG_EDIT_UNSPECIFIED
+ || p->checksum.type == PG_EDIT_UNSPECIFIED)
+ {
+ pg_edit_group_t *g = pg_stream_get_group (s, group_index);
+ g->edit_function = ip4_pg_edit_function;
+ g->edit_function_opaque = 0;
+ if (p->length.type == PG_EDIT_UNSPECIFIED)
+ g->edit_function_opaque |= IP4_PG_EDIT_LENGTH;
+ if (p->checksum.type == PG_EDIT_UNSPECIFIED)
+ g->edit_function_opaque |= IP4_PG_EDIT_CHECKSUM;
+ }
+
+ return 1;
+ }
+
+error:
+ /* Free up any edits we may have added. */
+ pg_free_edit_group (s);
+ return 0;
+}
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff