diff options
Diffstat (limited to 'vnet/vnet/nsh-gre/decap.c')
| -rw-r--r-- | vnet/vnet/nsh-gre/decap.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/vnet/vnet/nsh-gre/decap.c b/vnet/vnet/nsh-gre/decap.c new file mode 100644 index 00000000000..9ef52ffb6de --- /dev/null +++ b/vnet/vnet/nsh-gre/decap.c @@ -0,0 +1,365 @@ +/* + * nsh.c: nsh packet processing + * + * 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 <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/nsh-gre/nsh_gre.h> +#include <vnet/nsh-gre/nsh_gre_packet.h> + +vlib_node_registration_t nsh_input_node; + +typedef struct { + u32 next_index; + u32 tunnel_index; + u32 error; + nsh_header_t h; +} nsh_rx_trace_t; + + +u8 * format_nsh_header_with_length (u8 * s, va_list * args) +{ + nsh_header_t * h = va_arg (*args, nsh_header_t *); + u32 max_header_bytes = va_arg (*args, u32); + u32 tmp, header_bytes; + + header_bytes = sizeof (h[0]); + if (max_header_bytes != 0 && header_bytes > max_header_bytes) + return format (s, "gre-nsh header truncated"); + + s = format (s, "ver %d ", h->ver_o_c>>6); + + if (h->ver_o_c & NSH_GRE_O_BIT) + s = format (s, "O-set "); + + if (h->ver_o_c & NSH_GRE_C_BIT) + s = format (s, "C-set "); + + s = format (s, "len %d (%d bytes) md_type %d next_protocol %d\n", + h->length, h->length * 4, h->md_type, h->next_protocol); + + tmp = clib_net_to_host_u32 (h->spi_si); + + s = format (s, " spi %d si %d ", + (tmp>>NSH_GRE_SPI_SHIFT) & NSH_GRE_SPI_MASK, + tmp & NSH_GRE_SINDEX_MASK); + + s = format (s, "c1 %u c2 %u c3 %u c4 %u", + clib_net_to_host_u32 (h->c1), + clib_net_to_host_u32 (h->c2), + clib_net_to_host_u32 (h->c3), + clib_net_to_host_u32 (h->c4)); + + return s; +} + + +u8 * format_nsh_rx_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 *); + nsh_rx_trace_t * t = va_arg (*args, nsh_rx_trace_t *); + + if (t->tunnel_index != ~0) + { + s = format (s, "NSH: tunnel %d next %d error %d", t->tunnel_index, + t->next_index, t->error); + } + else + { + s = format (s, "NSH: no tunnel next %d error %d\n", t->next_index, + t->error); + } + s = format (s, "\n %U", format_nsh_header_with_length, &t->h, + (u32) sizeof (t->h) /* max size */); + return s; +} + +static uword +nsh_gre_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + nsh_gre_main_t * ngm = &nsh_gre_main; + u32 last_tunnel_index = ~0; + u64 last_key = ~0ULL; + u32 pkts_decapsulated = 0; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + next_index = node->cached_next_index; + + 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) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + u32 next0, next1; + nsh_header_t * h0, * h1; + uword * p0, * p1; + u32 tunnel_index0, tunnel_index1; + nsh_gre_tunnel_t * t0, * t1; + u64 key0, key1; + u32 error0, error1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + + /* gre stashed the src ip4 address for us... */ + key0 = (((u64)(vnet_buffer(b0)->gre.src))<<32) | h0->spi_si; + key1 = (((u64)(vnet_buffer(b1)->gre.src))<<32) | h1->spi_si; + + /* "pop" nsh header */ + vlib_buffer_advance (b0, sizeof (*h0)); + vlib_buffer_advance (b1, sizeof (*h1)); + + tunnel_index0 = ~0; + tunnel_index1 = ~0; + error0 = 0; + error1 = 0; + next0 = NSH_INPUT_NEXT_DROP; + next1 = NSH_INPUT_NEXT_DROP; + + if (PREDICT_FALSE(key0 != last_key)) + { + p0 = hash_get (ngm->nsh_gre_tunnel_by_src_address, key0); + + if (p0 == 0) + { + error0 = NSH_GRE_ERROR_NO_SUCH_TUNNEL; + goto trace0; + } + + last_key = key0; + tunnel_index0 = last_tunnel_index = p0[0]; + } + else + tunnel_index0 = last_tunnel_index; + + t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0); + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + vnet_update_l2_len (b0); + + next0 = t0->decap_next_index; + + /* ip[46] lookup in the configured FIB, otherwise an opaque */ + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index; + + trace0: + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + nsh_rx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->tunnel_index = tunnel_index0; + tr->h = h0[0]; + } + + if (PREDICT_FALSE(key1 != last_key)) + { + p1 = hash_get (ngm->nsh_gre_tunnel_by_src_address, key1); + + if (p1 == 0) + { + error1 = NSH_GRE_ERROR_NO_SUCH_TUNNEL; + goto trace1; + } + + last_key = key1; + tunnel_index1 = last_tunnel_index = p1[0]; + } + else + tunnel_index1 = last_tunnel_index; + + t1 = pool_elt_at_index (ngm->tunnels, tunnel_index1); + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + vnet_update_l2_len (b1); + + next1 = t1->decap_next_index; + + /* ip[46] lookup in the configured FIB, otherwise an opaque */ + vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index; + + pkts_decapsulated +=2; + + trace1: + b1->error = error1 ? node->errors[error1] : 0; + + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + nsh_rx_trace_t *tr = vlib_add_trace (vm, node, + b1, sizeof (*tr)); + tr->next_index = next1; + tr->error = error1; + tr->tunnel_index = tunnel_index1; + tr->h = h1[0]; + } + + 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) + { + u32 bi0; + vlib_buffer_t * b0; + u32 next0; + nsh_header_t * h0; + uword * p0; + u32 tunnel_index0; + nsh_gre_tunnel_t * t0; + u64 key0; + u32 error0; + + 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); + h0 = vlib_buffer_get_current (b0); + + /* gre stashed the src ip4 address for us... */ + key0 = (((u64)(vnet_buffer(b0)->gre.src))<<32) | h0->spi_si; + + /* "pop" nsh header */ + vlib_buffer_advance (b0, sizeof (*h0)); + + tunnel_index0 = ~0; + error0 = 0; + next0 = NSH_INPUT_NEXT_DROP; + + if (PREDICT_FALSE(key0 != last_key)) + { + p0 = hash_get (ngm->nsh_gre_tunnel_by_src_address, key0); + + if (p0 == 0) + { + error0 = NSH_GRE_ERROR_NO_SUCH_TUNNEL; + goto trace00; + } + + last_key = key0; + tunnel_index0 = last_tunnel_index = p0[0]; + } + else + tunnel_index0 = last_tunnel_index; + + t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0); + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + vnet_update_l2_len (b0); + + next0 = t0->decap_next_index; + + /* ip[46] lookup in the configured FIB, otherwise an opaque */ + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index; + pkts_decapsulated ++; + + trace00: + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + nsh_rx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->tunnel_index = tunnel_index0; + tr->h = h0[0]; + } + 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, nsh_gre_input_node.index, + NSH_GRE_ERROR_DECAPSULATED, + pkts_decapsulated); + return from_frame->n_vectors; +} + +static char * nsh_error_strings[] = { +#define nsh_gre_error(n,s) s, +#include <vnet/nsh-gre/nsh_gre_error.def> +#undef nsh_gre_error +#undef _ +}; + +VLIB_REGISTER_NODE (nsh_gre_input_node) = { + .function = nsh_gre_input, + .name = "nsh-gre-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = NSH_GRE_N_ERROR, + .error_strings = nsh_error_strings, + + .n_next_nodes = NSH_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [NSH_INPUT_NEXT_##s] = n, + foreach_nsh_gre_input_next +#undef _ + }, + + .format_buffer = format_nsh_header_with_length, + .format_trace = format_nsh_rx_trace, + // $$$$ .unformat_buffer = unformat_nsh_gre_header, +}; |