diff options
Diffstat (limited to 'vnet/vnet/lisp-gpe/encap.c')
| -rw-r--r-- | vnet/vnet/lisp-gpe/encap.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/vnet/vnet/lisp-gpe/encap.c b/vnet/vnet/lisp-gpe/encap.c new file mode 100644 index 00000000000..b3a52c464be --- /dev/null +++ b/vnet/vnet/lisp-gpe/encap.c @@ -0,0 +1,299 @@ +/* + * 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. + */ +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/lisp-gpe/lisp_gpe.h> + +/* Statistics (not really errors) */ +#define foreach_lisp_gpe_encap_error \ +_(ENCAPSULATED, "good packets encapsulated") + +static char * lisp_gpe_encap_error_strings[] = { +#define _(sym,string) string, + foreach_lisp_gpe_encap_error +#undef _ +}; + +typedef enum { +#define _(sym,str) LISP_GPE_ENCAP_ERROR_##sym, + foreach_lisp_gpe_encap_error +#undef _ + LISP_GPE_ENCAP_N_ERROR, +} lisp_gpe_encap_error_t; + +typedef enum { + LISP_GPE_ENCAP_NEXT_IP4_LOOKUP, + LISP_GPE_ENCAP_NEXT_DROP, + LISP_GPE_ENCAP_N_NEXT, +} lisp_gpe_encap_next_t; + +typedef struct { + u32 tunnel_index; +} lisp_gpe_encap_trace_t; + +u8 * format_lisp_gpe_encap_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 *); + lisp_gpe_encap_trace_t * t + = va_arg (*args, lisp_gpe_encap_trace_t *); + + s = format (s, "LISP-GPE-ENCAP: tunnel %d", t->tunnel_index); + return s; +} + +#define foreach_fixed_header_offset \ +_(0) _(1) _(2) _(3) + +static uword +lisp_gpe_encap (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + lisp_gpe_main_t * ngm = &lisp_gpe_main; + vnet_main_t * vnm = ngm->vnet_main; + u32 pkts_encapsulated = 0; + u16 old_l0 = 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); + +#if 0 + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + nsh_unicast_header_t * h0, * h1; + u32 label0, label1; + u32 next0, next1; + uword * p0, * p1; + + /* 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); + + next0 = next1 = NSH_INPUT_NEXT_IP4_INPUT; + + label0 = clib_net_to_host_u32 (h0->label_exp_s_ttl); + label1 = clib_net_to_host_u32 (h1->label_exp_s_ttl); + + /* + * Translate label contents into a fib index. + * This is a decent sanity check, and guarantees + * a sane FIB for the downstream lookup + */ + label0 = vnet_nsh_uc_get_label (label0); + label1 = vnet_nsh_uc_get_label (label1); + + /* If 2xlabels match, and match the 1-wide cache, use it */ + if (label0 == label1 && rt->last_label == label0) + { + vnet_buffer(b0)->sw_if_index[VLIB_TX] = rt->last_fib_index; + vnet_buffer(b1)->sw_if_index[VLIB_TX] = rt->last_fib_index; + } + else + { + p0 = hash_get (rt->mm->fib_index_by_nsh_label, label0); + if (PREDICT_FALSE (p0 == 0)) + { + next0 = NSH_INPUT_NEXT_DROP; + b0->error = node->errors[NSH_ERROR_BAD_LABEL]; + } + else + vnet_buffer(b0)->sw_if_index[VLIB_TX] = p0[0]; + + p1 = hash_get (rt->mm->fib_index_by_nsh_label, label1); + if (PREDICT_FALSE (p1 == 0)) + { + next1 = NSH_INPUT_NEXT_DROP; + b1->error = node->errors[NSH_ERROR_BAD_LABEL]; + } + else + { + vnet_buffer(b1)->sw_if_index[VLIB_TX] = p1[0]; + rt->last_fib_index = p1[0]; + rt->last_label = label1; + } + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + nsh_rx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->label_exp_s_ttl = label0; + } + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + nsh_rx_trace_t *tr = vlib_add_trace (vm, node, + b1, sizeof (*tr)); + tr->label_exp_s_ttl = label1; + } + + vlib_buffer_advance (b0, sizeof (*h0)); + vlib_buffer_advance (b1, sizeof (*h1)); + + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } +#endif + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t * b0; + u32 next0 = LISP_GPE_ENCAP_NEXT_IP4_LOOKUP; + vnet_hw_interface_t * hi0; + ip4_header_t * ip0; + udp_header_t * udp0; + u64 * copy_src0, * copy_dst0; + u32 * copy_src_last0, * copy_dst_last0; + lisp_gpe_tunnel_t * t0; + u16 new_l0; + ip_csum_t sum0; + + 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); + + /* 1-wide cache? */ + hi0 = vnet_get_sup_hw_interface + (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]); + + t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance); + + ASSERT(vec_len(t0->rewrite) >= 24); + + /* Apply the rewrite string. $$$$ vnet_rewrite? */ + vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite)); + + ip0 = vlib_buffer_get_current(b0); + /* Copy the fixed header */ + copy_dst0 = (u64 *) ip0; + copy_src0 = (u64 *) t0->rewrite; + + ASSERT (sizeof (ip4_udp_lisp_gpe_header_t) == 36); + + /* Copy first 32 octets 8-bytes at a time */ +#define _(offs) copy_dst0[offs] = copy_src0[offs]; + foreach_fixed_header_offset; +#undef _ + /* Last 4 octets. Hopefully gcc will be our friend */ + copy_dst_last0 = (u32 *)(©_dst0[4]); + copy_src_last0 = (u32 *)(©_src0[4]); + + copy_dst_last0[0] = copy_src_last0[0]; + + /* fix the <bleep>ing outer-IP checksum */ + sum0 = ip0->checksum; + /* old_l0 always 0, see the rewrite setup */ + new_l0 = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + + sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t, + length /* changed member */); + ip0->checksum = ip_csum_fold (sum0); + ip0->length = new_l0; + + /* Fix UDP length */ + udp0 = (udp_header_t *)(ip0+1); + new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) + - sizeof (*ip0)); + + udp0->length = new_l0; + + /* Reset to look up tunnel partner in the configured FIB */ + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index; + pkts_encapsulated ++; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + lisp_gpe_encap_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->tunnel_index = t0 - ngm->tunnels; + } + 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, + LISP_GPE_ENCAP_ERROR_ENCAPSULATED, + pkts_encapsulated); + return from_frame->n_vectors; +} + +VLIB_REGISTER_NODE (lisp_gpe_encap_node) = { + .function = lisp_gpe_encap, + .name = "lisp-gpe-encap", + .vector_size = sizeof (u32), + .format_trace = format_lisp_gpe_encap_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(lisp_gpe_encap_error_strings), + .error_strings = lisp_gpe_encap_error_strings, + + .n_next_nodes = LISP_GPE_ENCAP_N_NEXT, + + .next_nodes = { + [LISP_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup", + [LISP_GPE_ENCAP_NEXT_DROP] = "error-drop", + }, +}; |