diff options
Diffstat (limited to 'extras/emacs/tunnel-decap-skel.el')
| -rw-r--r-- | extras/emacs/tunnel-decap-skel.el | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/extras/emacs/tunnel-decap-skel.el b/extras/emacs/tunnel-decap-skel.el new file mode 100644 index 00000000000..380273b67a2 --- /dev/null +++ b/extras/emacs/tunnel-decap-skel.el @@ -0,0 +1,299 @@ +;;; tunnel-decap-skel.el - tunnel decapsulation skeleton + +(require 'skeleton) + +(define-skeleton skel-tunnel-decap +"Insert a tunnel decap implementation" +nil +'(setq encap_stack (skeleton-read "encap_stack (e.g ip4_udp_lisp): ")) +'(setq ENCAP_STACK (upcase encap_stack)) +'(setq encap-stack (replace-regexp-in-string "_" "-" encap_stack)) +'(setq ENCAP-STACK (upcase encap-stack)) +" +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/" encap-stack "/" encap_stack ".h> + +typedef struct { + u32 next_index; + u32 tunnel_index; + u32 error; + " encap_stack "_header_t h; +} " encap_stack "_rx_trace_t; + +static u8 * format_" encap_stack "_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 *); + " encap_stack "_rx_trace_t * t = va_arg (*args, " encap_stack "_rx_trace_t *); + + if (t->tunnel_index != ~0) + { + s = format (s, \"" ENCAP-STACK ": tunnel %d next %d error %d\", + t->tunnel_index, t->next_index, t->error); + } + else + { + s = format (s, \"" ENCAP-STACK ": no tunnel next %d error %d\\n\", + t->next_index, t->error); + } + s = format (s, \"\\n %U\", format_" encap_stack "_header_with_length, &t->h, + (u32) sizeof (t->h) /* max size */); + return s; +} + +static uword +" encap_stack "_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + " encap_stack "_main_t * ngm = &" encap_stack "_main; + u32 last_tunnel_index = ~0; + " encap_stack "_tunnel_key_t last_key; + u32 pkts_decapsulated = 0; + + memset (&last_key, 0xff, sizeof (last_key)); + + 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 /* $$$ dual loop when the single loop works */ + 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 = " ENCAP_STACK "_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 = " ENCAP_STACK "_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 = " ENCAP_STACK "_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; + " encap_stack "_header_t * iuX0; + uword * p0; + u32 tunnel_index0; + " encap_stack "_tunnel_t * t0; + " encap_stack "_tunnel_key_t 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); + + /* + * udp leaves current_data pointing at the tunnel header + * $$$$ FIXME + */ + vlib_buffer_advance + (b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t))); + + iuX0 = vlib_buffer_get_current (b0); + + /* pop (ip, udp, lisp-gpe) */ + vlib_buffer_advance (b0, sizeof (*iuX0)); + + tunnel_index0 = ~0; + error0 = 0; + next0 = " ENCAP_STACK "_INPUT_NEXT_DROP; + + key0.src = iuX0->ip4.src_address.as_u32; + key0.iid = iuX0->lisp.iid; + + /* $$$ validate key comparison */ + if (PREDICT_FALSE ((key0.as_u64[0] != last_key.as_u64[0]))) + { + p0 = hash_get_mem (ngm->" encap_stack "_tunnel_by_key, &key0); + + if (p0 == 0) + { + error0 = " ENCAP_STACK "_ERROR_NO_SUCH_TUNNEL; + goto trace0; + } + + last_key.as_u64[0] = key0.as_u64[0]; + tunnel_index0 = last_tunnel_index = p0[0]; + } + else + tunnel_index0 = last_tunnel_index; + + t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0); + + next0 = t0->decap_next_index; + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + vnet_update_l2_len (b0); + + /* + * ip[46] lookup in the configured FIB + * " encap-stack ", here's the encap tunnel sw_if_index + */ + vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index; + pkts_decapsulated ++; + + trace0: + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + " encap_stack "_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 = iuX0->lisp; + } + 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, " encap_stack "_input_node.index, + " ENCAP_STACK "_ERROR_DECAPSULATED, + pkts_decapsulated); + return from_frame->n_vectors; +} + +static char * " encap_stack "_error_strings[] = { +#define " encap_stack "_error(n,s) s, +#include <vnet/" encap-stack "/" encap_stack "_error.def> +#undef " encap_stack "_error +#undef _ +}; + +VLIB_REGISTER_NODE (" encap_stack "_input_node) = { + .function = \"" encap_stack "_input\", + .name = \"" encap-stack "-input\", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = " ENCAP_STACK "_N_ERROR, + .error_strings = " encap_stack "_error_strings, + + .n_next_nodes = " ENCAP_STACK "_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [" ENCAP_STACK "_INPUT_NEXT_##s] = n, + foreach_" encap_stack "_input_next +#undef _ + }, + + .format_buffer = format_" encap_stack "_header_with_length, + .format_trace = format_" encap_stack "_rx_trace, + // $$$$ .unformat_buffer = unformat_" encap_stack "_header, +}; + +") |