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Diffstat (limited to 'src/plugins/l2e/l2e.c')
| -rw-r--r-- | src/plugins/l2e/l2e.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/src/plugins/l2e/l2e.c b/src/plugins/l2e/l2e.c new file mode 100644 index 00000000000..633d1f92838 --- /dev/null +++ b/src/plugins/l2e/l2e.c @@ -0,0 +1,485 @@ +/* + * l2_emulation.h : Extract L3 packets from the L2 input and feed + * them into the L3 path. + * + * 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 <plugins/l2e/l2e.h> +#include <vnet/l2/l2_input.h> + +/** + * Grouping of global data for the L2 emulation feature + */ +typedef struct l2_emulation_main_t_ +{ + /** + * Next nodes for L2 output features + */ + u32 l2_input_feat_next[32]; +} l2_emulation_main_t; + +static l2_emulation_main_t l2_emulation_main; + +/** + * Per-interface L2 configuration + */ +typedef struct l2_emulation_t_ +{ + /** + * Enabled or Disabled. + * this is required since one L3 protocl can be enabled, but others not + */ + u8 enabled; +} l2_emulation_t; + +/** + * A zero'd out struct we can use in the vec_validate + */ +static const l2_emulation_t ezero = { }; + +/** + * Per-interface vector of emulation configs + */ +l2_emulation_t *l2_emulations; + +void +l2_emulation_enable (u32 sw_if_index) +{ + vec_validate_init_empty (l2_emulations, sw_if_index, ezero); + + l2_emulation_t *l23e = &l2_emulations[sw_if_index]; + + l23e->enabled = 1; + + /* + * L3 enable the interface - using IP unnumbered from the control + * plane may not be possible since there may be no BVI interface + * to which to unnumber + */ + ip4_sw_interface_enable_disable (sw_if_index, 1); + ip6_sw_interface_enable_disable (sw_if_index, 1); + + l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_L2_EMULATION, 1); +} + + +void +l2_emulation_disable (u32 sw_if_index) +{ + if (vec_len (l2_emulations) >= sw_if_index) + { + l2_emulation_t *l23e = &l2_emulations[sw_if_index]; + memset (l23e, 0, sizeof (*l23e)); + + l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_L2_EMULATION, 0); + ip4_sw_interface_enable_disable (sw_if_index, 0); + ip6_sw_interface_enable_disable (sw_if_index, 0); + } +} + +static clib_error_t * +l2_emulation_interface_add_del (vnet_main_t * vnm, + u32 sw_if_index, u32 is_add) +{ + if (is_add) + { + vec_validate_init_empty (l2_emulations, sw_if_index, ezero); + } + + return (NULL); +} + +VNET_SW_INTERFACE_ADD_DEL_FUNCTION (l2_emulation_interface_add_del); + +static clib_error_t * +l2_emulation_cli (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + vnet_main_t *vnm = vnet_get_main (); + u32 sw_if_index = ~0; + u8 enable = 1; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "%U", unformat_vnet_sw_interface, + vnm, &sw_if_index)) + ; + else if (unformat (input, "enable")) + enable = 1; + else if (unformat (input, "disable")) + enable = 0; + else + break; + } + + if (~0 == sw_if_index) + return clib_error_return (0, "interface must be specified"); + + if (enable) + l2_emulation_enable (sw_if_index); + else + l2_emulation_disable (sw_if_index); + + return (NULL); +} + +/*? + * Configure l2 emualtion. + * When the interface is in L2 mode, configure the extraction of L3 + * packets out of the L2 path and into the L3 path. + * + * @cliexpar + * @cliexstart{set interface l2 input l2-emulation <interface-name> [disable] + * @cliexend + ?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (l2_emulation_cli_node, static) = { + .path = "set interface l2 l2-emulation", + .short_help = + "set interface l2 l2-emulation <interface-name> [disable|enable]\n", + .function = l2_emulation_cli, +}; +/* *INDENT-ON* */ + +static clib_error_t * +l2_emulation_show (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + vnet_main_t *vnm = vnet_get_main (); + l2_emulation_t *l23e; + u32 sw_if_index; + + vec_foreach_index (sw_if_index, l2_emulations) + { + l23e = &l2_emulations[sw_if_index]; + if (l23e->enabled) + { + vlib_cli_output (vm, "%U\n", + format_vnet_sw_if_index_name, vnm, sw_if_index); + } + } + return (NULL); +} + +/*? + * Show l2 emulation. + * When the interface is in L2 mode, configure the extraction of L3 + * packets out of the L2 path and into the L3 path. + * + * @cliexpar + * @cliexstart{show interface l2 l2-emulation + * @cliexend + ?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (l2_emulation_show_node, static) = { + .path = "show interface l2 l2-emulation", + .short_help = "show interface l2 l2-emulation\n", + .function = l2_emulation_show, +}; +/* *INDENT-ON* */ + +#define foreach_l2_emulation \ + _(IP4, "Extract IPv4") \ + _(IP6, "Extract IPv6") + +typedef enum +{ +#define _(sym,str) L2_EMULATION_ERROR_##sym, + foreach_l2_emulation +#undef _ + L2_EMULATION_N_ERROR, +} l2_emulation_error_t; + +static char *l2_emulation_error_strings[] = { +#define _(sym,string) string, + foreach_l2_emulation +#undef _ +}; + +typedef enum +{ +#define _(sym,str) L2_EMULATION_NEXT_##sym, + foreach_l2_emulation +#undef _ + L2_EMULATION_N_NEXT, +} l2_emulation_next_t; + +/** + * per-packet trace data + */ +typedef struct l2_emulation_trace_t_ +{ + /* per-pkt trace data */ + u8 extracted; +} l2_emulation_trace_t; + +static uword +l2_emulation_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + l2_emulation_main_t *em = &l2_emulation_main; + u32 n_left_from, *from, *to_next; + l2_emulation_next_t next_index; + u32 ip4_hits = 0; + u32 ip6_hits = 0; + + next_index = 0; + n_left_from = frame->n_vectors; + from = vlib_frame_vector_args (frame); + + 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 >= 4 && n_left_to_next >= 2) + { + vlib_buffer_t *b0, *b1; + u32 sw_if_index0, sw_if_index1; + u16 ether_type0, ether_type1; + u32 next0 = ~0, next1 = ~0; + u8 l2_len0, l2_len1; + u32 bi0, bi1; + u8 *h0, *h1; + + bi0 = to_next[0] = from[0]; + bi1 = to_next[1] = from[1]; + + from += 2; + n_left_from -= 2; + to_next += 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + l2_len0 = vnet_buffer (b0)->l2.l2_len; + l2_len1 = vnet_buffer (b1)->l2.l2_len; + + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + + ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2)); + ether_type1 = clib_net_to_host_u16 (*(u16 *) (h1 + l2_len1 - 2)); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + + /* + * only extract unicast + */ + if (PREDICT_TRUE (!(h0[0] & 0x1))) + { + switch (ether_type0) + { + case ETHERNET_TYPE_IP4: + ASSERT (l2_emulations[sw_if_index0].enabled); + ++ip4_hits; + next0 = L2_EMULATION_NEXT_IP4; + vlib_buffer_advance (b0, l2_len0); + break; + case ETHERNET_TYPE_IP6: + ASSERT (l2_emulations[sw_if_index0].enabled); + ++ip6_hits; + next0 = L2_EMULATION_NEXT_IP6; + vlib_buffer_advance (b0, l2_len0); + default: + break; + } + } + if (PREDICT_TRUE (!(h1[0] & 0x1))) + { + switch (ether_type1) + { + case ETHERNET_TYPE_IP4: + ASSERT (l2_emulations[sw_if_index1].enabled); + ++ip4_hits; + next1 = L2_EMULATION_NEXT_IP4; + vlib_buffer_advance (b1, l2_len1); + break; + case ETHERNET_TYPE_IP6: + ASSERT (l2_emulations[sw_if_index1].enabled); + ++ip6_hits; + next1 = L2_EMULATION_NEXT_IP6; + vlib_buffer_advance (b1, l2_len1); + default: + break; + } + } + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + l2_emulation_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->extracted = (next0 != ~0); + } + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + l2_emulation_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->extracted = (next1 != ~0); + } + + /* Determine the next node and remove ourself from bitmap */ + if (PREDICT_TRUE (next0 == ~0)) + next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next, + L2INPUT_FEAT_L2_EMULATION); + + /* Determine the next node and remove ourself from bitmap */ + if (PREDICT_TRUE (next1 == ~0)) + next1 = vnet_l2_feature_next (b1, em->l2_input_feat_next, + L2INPUT_FEAT_L2_EMULATION); + + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + while (n_left_from > 0 && n_left_to_next > 0) + { + vlib_buffer_t *b0; + u32 sw_if_index0; + u16 ether_type0; + u32 next0 = ~0; + u8 l2_len0; + u32 bi0; + u8 *h0; + + 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); + l2_len0 = vnet_buffer (b0)->l2.l2_len; + + h0 = vlib_buffer_get_current (b0); + ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2)); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + /* + * only extract unicast + */ + if (PREDICT_TRUE (!(h0[0] & 0x1))) + { + switch (ether_type0) + { + case ETHERNET_TYPE_IP4: + ASSERT (l2_emulations[sw_if_index0].enabled); + ++ip4_hits; + next0 = L2_EMULATION_NEXT_IP4; + vlib_buffer_advance (b0, l2_len0); + break; + case ETHERNET_TYPE_IP6: + ASSERT (l2_emulations[sw_if_index0].enabled); + ++ip6_hits; + next0 = L2_EMULATION_NEXT_IP6; + vlib_buffer_advance (b0, l2_len0); + default: + break; + } + } + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + l2_emulation_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->extracted = (next0 != ~0); + } + + /* Determine the next node and remove ourself from bitmap */ + if (PREDICT_TRUE (next0 == ~0)) + next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next, + L2INPUT_FEAT_L2_EMULATION); + + /* verify speculative enqueue, maybe switch current next frame */ + 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, node->node_index, + L2_EMULATION_ERROR_IP4, ip4_hits); + vlib_node_increment_counter (vm, node->node_index, + L2_EMULATION_ERROR_IP6, ip6_hits); + + return frame->n_vectors; +} + +/* packet trace format function */ +static u8 * +format_l2_emulation_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 *); + l2_emulation_trace_t *t = va_arg (*args, l2_emulation_trace_t *); + + s = format (s, "l2-emulation: %s", (t->extracted ? "yes" : "no")); + + return s; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (l2_emulation_node) = { + .function = l2_emulation_node_fn, + .name = "l2-emulation", + .vector_size = sizeof (u32), + .format_trace = format_l2_emulation_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2_emulation_error_strings), + .error_strings = l2_emulation_error_strings, + + .n_next_nodes = L2_EMULATION_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2_EMULATION_NEXT_IP4] = "ip4-input", + [L2_EMULATION_NEXT_IP6] = "ip6-input", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (l2_emulation_node, l2_emulation_node_fn); + + +static clib_error_t * +l2_emulation_init (vlib_main_t * vm) +{ + l2_emulation_main_t *em = &l2_emulation_main; + + /* Initialize the feature next-node indexes */ + feat_bitmap_init_next_nodes (vm, + l2_emulation_node.index, + L2INPUT_N_FEAT, + l2input_get_feat_names (), + em->l2_input_feat_next); + + return 0; +} + +VLIB_INIT_FUNCTION (l2_emulation_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |