src/plugins/nat/pnat/tests/pnat_test_stubs.h

   1 /*
   2  * Copyright (c) 2021 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #ifndef included_pnat_test_stubs_h
  17 #define included_pnat_test_stubs_h
  18
  19 void os_panic(void) {}
  20 void os_exit(int code) {}
  21 u32 ip4_fib_table_get_index_for_sw_if_index(u32 sw_if_index) { return 0; }
  22 #include <vpp/stats/stat_segment.h>
  23 clib_error_t *stat_segment_register_gauge(u8 *names,
  24                                           stat_segment_update_fn update_fn,
  25                                           u32 index) {
  26     return 0;
  27 };
  28 #include <vnet/feature/feature.h>
  29 vnet_feature_main_t feature_main;
  30 void classify_get_trace_chain(void){};
  31
  32 /* Format an IP4 address. */
  33 u8 *format_ip4_address(u8 *s, va_list *args) {
  34     u8 *a = va_arg(*args, u8 *);
  35     return format(s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
  36 }
  37
  38 u8 *format_pnat_match_tuple(u8 *s, va_list *args) { return 0; }
  39 u8 *format_pnat_rewrite_tuple(u8 *s, va_list *args) { return 0; }
  40
  41 vl_counter_t pnat_error_counters[10];
  42
  43 int ip4_sv_reass_enable_disable_with_refcnt(u32 sw_if_index, int is_enable) {
  44     return 0;
  45 }
  46 int ip4_sv_reass_output_enable_disable_with_refcnt(u32 sw_if_index,
  47                                                    int is_enable) {
  48     return 0;
  49 }
  50 int vnet_feature_enable_disable(const char *arc_name, const char *node_name,
  51                                 u32 sw_if_index, int enable_disable,
  52                                 void *feature_config,
  53                                 u32 n_feature_config_bytes) {
  54     return 0;
  55 }
  56 vnet_main_t *vnet_get_main(void) { return 0; }
  57
  58 /* Compute TCP/UDP/ICMP4 checksum in software. */
  59 u16 ip4_tcp_udp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0,
  60                                  ip4_header_t *ip0) {
  61     ip_csum_t sum0;
  62     u32 ip_header_length, payload_length_host_byte_order;
  63
  64     /* Initialize checksum with ip header. */
  65     ip_header_length = ip4_header_bytes(ip0);
  66     payload_length_host_byte_order =
  67         clib_net_to_host_u16(ip0->length) - ip_header_length;
  68     sum0 = clib_host_to_net_u32(payload_length_host_byte_order +
  69                                 (ip0->protocol << 16));
  70
  71     if (BITS(uword) == 32) {
  72         sum0 = ip_csum_with_carry(sum0,
  73                                   clib_mem_unaligned(&ip0->src_address, u32));
  74         sum0 = ip_csum_with_carry(sum0,
  75                                   clib_mem_unaligned(&ip0->dst_address, u32));
  76     } else
  77         sum0 = ip_csum_with_carry(sum0,
  78                                   clib_mem_unaligned(&ip0->src_address, u64));
  79     return ip_calculate_l4_checksum(vm, p0, sum0,
  80                                     payload_length_host_byte_order, (u8 *)ip0,
  81                                     ip_header_length, NULL);
  82 }
  83
  84 u32 ip4_tcp_udp_validate_checksum(vlib_main_t *vm, vlib_buffer_t *p0) {
  85     ip4_header_t *ip0 = vlib_buffer_get_current(p0);
  86     udp_header_t *udp0;
  87     u16 sum16;
  88
  89     ASSERT(ip0->protocol == IP_PROTOCOL_TCP ||
  90            ip0->protocol == IP_PROTOCOL_UDP);
  91
  92     udp0 = (void *)(ip0 + 1);
  93     if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0) {
  94         p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
  95                       VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
  96         return p0->flags;
  97     }
  98
  99     sum16 = ip4_tcp_udp_compute_checksum(vm, p0, ip0);
 100
 101     p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
 102                   ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
 103
 104     return p0->flags;
 105 }
 106 u8 *format_tcp_header(u8 *s, va_list *args) {
 107     tcp_header_t *tcp = va_arg(*args, tcp_header_t *);
 108     u32 max_header_bytes = va_arg(*args, u32);
 109     u32 header_bytes;
 110     u32 indent;
 111
 112     /* Nothing to do. */
 113     if (max_header_bytes < sizeof(tcp[0]))
 114         return format(s, "TCP header truncated");
 115
 116     indent = format_get_indent(s);
 117     indent += 2;
 118     header_bytes = tcp_header_bytes(tcp);
 119
 120     s = format(s, "TCP: %d -> %d", clib_net_to_host_u16(tcp->src),
 121                clib_net_to_host_u16(tcp->dst));
 122
 123     s = format(s, "\n%Useq. 0x%08x ack 0x%08x", format_white_space, indent,
 124                clib_net_to_host_u32(tcp->seq_number),
 125                clib_net_to_host_u32(tcp->ack_number));
 126
 127     s = format(s, "\n%Utcp header: %d bytes", format_white_space, indent,
 128                tcp->flags, header_bytes);
 129
 130     s = format(s, "\n%Uwindow %d, checksum 0x%04x", format_white_space, indent,
 131                clib_net_to_host_u16(tcp->window),
 132                clib_net_to_host_u16(tcp->checksum));
 133     return s;
 134 }
 135 /* Format UDP header. */
 136 u8 *format_udp_header(u8 *s, va_list *args) {
 137     udp_header_t *udp = va_arg(*args, udp_header_t *);
 138     u32 max_header_bytes = va_arg(*args, u32);
 139     u32 indent;
 140
 141     /* Nothing to do. */
 142     if (max_header_bytes < sizeof(udp[0]))
 143         return format(s, "UDP header truncated");
 144
 145     indent = format_get_indent(s);
 146     indent += 2;
 147
 148     s = format(s, "UDP: %d -> %d", clib_net_to_host_u16(udp->src_port),
 149                clib_net_to_host_u16(udp->dst_port));
 150
 151     s = format(s, "\n%Ulength %d, checksum 0x%04x", format_white_space, indent,
 152                clib_net_to_host_u16(udp->length),
 153                clib_net_to_host_u16(udp->checksum));
 154
 155     return s;
 156 }
 157
 158 /* Format an IP4 header. */
 159 u8 *format_ip4_header(u8 *s, va_list *args) {
 160     ip4_header_t *ip = va_arg(*args, ip4_header_t *);
 161     u32 max_header_bytes = va_arg(*args, u32);
 162     u32 ip_version, header_bytes;
 163     u32 indent;
 164
 165     /* Nothing to do. */
 166     if (max_header_bytes < sizeof(ip[0]))
 167         return format(s, "IP header truncated");
 168
 169     indent = format_get_indent(s);
 170     indent += 2;
 171
 172     ip_version = (ip->ip_version_and_header_length >> 4);
 173     header_bytes = (ip->ip_version_and_header_length & 0xf) * sizeof(u32);
 174
 175     s = format(s, "%d: %U -> %U", ip->protocol, format_ip4_address,
 176                ip->src_address.data, format_ip4_address, ip->dst_address.data);
 177
 178     /* Show IP version and header length only with unexpected values. */
 179     if (ip_version != 4 || header_bytes != sizeof(ip4_header_t))
 180         s = format(s, "\n%Uversion %d, header length %d", format_white_space,
 181                    indent, ip_version, header_bytes);
 182
 183     s = format(s, "\n%Utos 0x%02x, ttl %d, length %d, checksum 0x%04x",
 184                format_white_space, indent, ip->tos, ip->ttl,
 185                clib_net_to_host_u16(ip->length),
 186                clib_net_to_host_u16(ip->checksum));
 187
 188     /* Check and report invalid checksums. */
 189     {
 190         if (!ip4_header_checksum_is_valid(ip))
 191             s = format(s, " (should be 0x%04x)",
 192                        clib_net_to_host_u16(ip4_header_checksum(ip)));
 193     }
 194
 195     {
 196         u32 f = clib_net_to_host_u16(ip->flags_and_fragment_offset);
 197         u32 o;
 198
 199         s = format(s, "\n%Ufragment id 0x%04x", format_white_space, indent,
 200                    clib_net_to_host_u16(ip->fragment_id));
 201
 202         /* Fragment offset. */
 203         o = 8 * (f & 0x1fff);
 204         f ^= f & 0x1fff;
 205         if (o != 0)
 206             s = format(s, " offset %d", o);
 207
 208         if (f != 0) {
 209             s = format(s, ", flags ");
 210 #define _(l)                                                                   \
 211     if (f & IP4_HEADER_FLAG_##l)                                               \
 212         s = format(s, #l);
 213             _(MORE_FRAGMENTS);
 214             _(DONT_FRAGMENT);
 215             _(CONGESTION);
 216 #undef _
 217         }
 218         /* Fragment packet but not the first. */
 219         if (o != 0)
 220             return s;
 221     }
 222
 223     return s;
 224 }
 225
 226 #endif