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 <vnet/feature/feature.h>
  23 vnet_feature_main_t feature_main;
  24 void classify_get_trace_chain(void){};
  25
  26 /* Format an IP4 address. */
  27 u8 *format_ip4_address(u8 *s, va_list *args) {
  28     u8 *a = va_arg(*args, u8 *);
  29     return format(s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
  30 }
  31
  32 u8 *format_pnat_match_tuple(u8 *s, va_list *args) { return 0; }
  33 u8 *format_pnat_rewrite_tuple(u8 *s, va_list *args) { return 0; }
  34
  35 vlib_error_desc_t pnat_error_counters[10];
  36
  37 int ip4_sv_reass_enable_disable_with_refcnt(u32 sw_if_index, int is_enable) {
  38     return 0;
  39 }
  40 int ip4_sv_reass_output_enable_disable_with_refcnt(u32 sw_if_index,
  41                                                    int is_enable) {
  42     return 0;
  43 }
  44 int vnet_feature_enable_disable(const char *arc_name, const char *node_name,
  45                                 u32 sw_if_index, int enable_disable,
  46                                 void *feature_config,
  47                                 u32 n_feature_config_bytes) {
  48     return 0;
  49 }
  50 vnet_main_t *vnet_get_main(void) { return 0; }
  51
  52 /* Compute TCP/UDP/ICMP4 checksum in software. */
  53 u16 ip4_tcp_udp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0,
  54                                  ip4_header_t *ip0) {
  55     ip_csum_t sum0;
  56     u32 ip_header_length, payload_length_host_byte_order;
  57
  58     /* Initialize checksum with ip header. */
  59     ip_header_length = ip4_header_bytes(ip0);
  60     payload_length_host_byte_order =
  61         clib_net_to_host_u16(ip0->length) - ip_header_length;
  62     sum0 = clib_host_to_net_u32(payload_length_host_byte_order +
  63                                 (ip0->protocol << 16));
  64
  65     if (BITS(uword) == 32) {
  66         sum0 = ip_csum_with_carry(sum0,
  67                                   clib_mem_unaligned(&ip0->src_address, u32));
  68         sum0 = ip_csum_with_carry(sum0,
  69                                   clib_mem_unaligned(&ip0->dst_address, u32));
  70     } else
  71         sum0 = ip_csum_with_carry(sum0,
  72                                   clib_mem_unaligned(&ip0->src_address, u64));
  73     return ip_calculate_l4_checksum(vm, p0, sum0,
  74                                     payload_length_host_byte_order, (u8 *)ip0,
  75                                     ip_header_length, NULL);
  76 }
  77
  78 u32 ip4_tcp_udp_validate_checksum(vlib_main_t *vm, vlib_buffer_t *p0) {
  79     ip4_header_t *ip0 = vlib_buffer_get_current(p0);
  80     udp_header_t *udp0;
  81     u16 sum16;
  82
  83     ASSERT(ip0->protocol == IP_PROTOCOL_TCP ||
  84            ip0->protocol == IP_PROTOCOL_UDP);
  85
  86     udp0 = (void *)(ip0 + 1);
  87     if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0) {
  88         p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
  89                       VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
  90         return p0->flags;
  91     }
  92
  93     sum16 = ip4_tcp_udp_compute_checksum(vm, p0, ip0);
  94
  95     p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED |
  96                   ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
  97
  98     return p0->flags;
  99 }
 100 u8 *format_tcp_header(u8 *s, va_list *args) {
 101     tcp_header_t *tcp = va_arg(*args, tcp_header_t *);
 102     u32 max_header_bytes = va_arg(*args, u32);
 103     u32 header_bytes;
 104     u32 indent;
 105
 106     /* Nothing to do. */
 107     if (max_header_bytes < sizeof(tcp[0]))
 108         return format(s, "TCP header truncated");
 109
 110     indent = format_get_indent(s);
 111     indent += 2;
 112     header_bytes = tcp_header_bytes(tcp);
 113
 114     s = format(s, "TCP: %d -> %d", clib_net_to_host_u16(tcp->src),
 115                clib_net_to_host_u16(tcp->dst));
 116
 117     s = format(s, "\n%Useq. 0x%08x ack 0x%08x", format_white_space, indent,
 118                clib_net_to_host_u32(tcp->seq_number),
 119                clib_net_to_host_u32(tcp->ack_number));
 120
 121     s = format(s, "\n%Utcp header: %d bytes", format_white_space, indent,
 122                tcp->flags, header_bytes);
 123
 124     s = format(s, "\n%Uwindow %d, checksum 0x%04x", format_white_space, indent,
 125                clib_net_to_host_u16(tcp->window),
 126                clib_net_to_host_u16(tcp->checksum));
 127     return s;
 128 }
 129 /* Format UDP header. */
 130 u8 *format_udp_header(u8 *s, va_list *args) {
 131     udp_header_t *udp = va_arg(*args, udp_header_t *);
 132     u32 max_header_bytes = va_arg(*args, u32);
 133     u32 indent;
 134
 135     /* Nothing to do. */
 136     if (max_header_bytes < sizeof(udp[0]))
 137         return format(s, "UDP header truncated");
 138
 139     indent = format_get_indent(s);
 140     indent += 2;
 141
 142     s = format(s, "UDP: %d -> %d", clib_net_to_host_u16(udp->src_port),
 143                clib_net_to_host_u16(udp->dst_port));
 144
 145     s = format(s, "\n%Ulength %d, checksum 0x%04x", format_white_space, indent,
 146                clib_net_to_host_u16(udp->length),
 147                clib_net_to_host_u16(udp->checksum));
 148
 149     return s;
 150 }
 151
 152 /* Format an IP4 header. */
 153 u8 *format_ip4_header(u8 *s, va_list *args) {
 154     ip4_header_t *ip = va_arg(*args, ip4_header_t *);
 155     u32 max_header_bytes = va_arg(*args, u32);
 156     u32 ip_version, header_bytes;
 157     u32 indent;
 158
 159     /* Nothing to do. */
 160     if (max_header_bytes < sizeof(ip[0]))
 161         return format(s, "IP header truncated");
 162
 163     indent = format_get_indent(s);
 164     indent += 2;
 165
 166     ip_version = (ip->ip_version_and_header_length >> 4);
 167     header_bytes = (ip->ip_version_and_header_length & 0xf) * sizeof(u32);
 168
 169     s = format(s, "%d: %U -> %U", ip->protocol, format_ip4_address,
 170                ip->src_address.data, format_ip4_address, ip->dst_address.data);
 171
 172     /* Show IP version and header length only with unexpected values. */
 173     if (ip_version != 4 || header_bytes != sizeof(ip4_header_t))
 174         s = format(s, "\n%Uversion %d, header length %d", format_white_space,
 175                    indent, ip_version, header_bytes);
 176
 177     s = format(s, "\n%Utos 0x%02x, ttl %d, length %d, checksum 0x%04x",
 178                format_white_space, indent, ip->tos, ip->ttl,
 179                clib_net_to_host_u16(ip->length),
 180                clib_net_to_host_u16(ip->checksum));
 181
 182     /* Check and report invalid checksums. */
 183     {
 184         if (!ip4_header_checksum_is_valid(ip))
 185             s = format(s, " (should be 0x%04x)",
 186                        clib_net_to_host_u16(ip4_header_checksum(ip)));
 187     }
 188
 189     {
 190         u32 f = clib_net_to_host_u16(ip->flags_and_fragment_offset);
 191         u32 o;
 192
 193         s = format(s, "\n%Ufragment id 0x%04x", format_white_space, indent,
 194                    clib_net_to_host_u16(ip->fragment_id));
 195
 196         /* Fragment offset. */
 197         o = 8 * (f & 0x1fff);
 198         f ^= f & 0x1fff;
 199         if (o != 0)
 200             s = format(s, " offset %d", o);
 201
 202         if (f != 0) {
 203             s = format(s, ", flags ");
 204 #define _(l)                                                                   \
 205     if (f & IP4_HEADER_FLAG_##l)                                               \
 206         s = format(s, #l);
 207             _(MORE_FRAGMENTS);
 208             _(DONT_FRAGMENT);
 209             _(CONGESTION);
 210 #undef _
 211         }
 212         /* Fragment packet but not the first. */
 213         if (o != 0)
 214             return s;
 215     }
 216
 217     return s;
 218 }
 219
 220 #endif