diff options
Diffstat (limited to 'src/vnet/mpls')
| -rw-r--r-- | src/vnet/mpls/mpls_output.c | 218 |
1 files changed, 181 insertions, 37 deletions
diff --git a/src/vnet/mpls/mpls_output.c b/src/vnet/mpls/mpls_output.c index 5ede22aa410..247f531df9f 100644 --- a/src/vnet/mpls/mpls_output.c +++ b/src/vnet/mpls/mpls_output.c @@ -34,8 +34,7 @@ typedef enum { #define foreach_mpls_output_next \ _(DROP, "error-drop") \ -_(IP4_FRAG, "ip4-frag") \ -_(IP6_FRAG, "ip6-frag") +_(FRAG, "mpls-frag") typedef enum { #define _(s,n) MPLS_OUTPUT_NEXT_##s, @@ -58,31 +57,6 @@ format_mpls_output_trace (u8 * s, va_list * args) return s; } -/* - * Save the mpls header length and adjust the current to ip header - */ -static inline u32 -set_mpls_fragmentation(vlib_buffer_t * p0, ip_adjacency_t * adj0) -{ - u32 next0; - - /* advance size of (all) mpls header to ip header before fragmenting */ - /* save the current pointing to first mpls header. */ - vnet_buffer (p0)->mpls.mpls_hdr_length = vnet_buffer(p0)->l3_hdr_offset - p0->current_data; - vlib_buffer_advance (p0, vnet_buffer (p0)->mpls.mpls_hdr_length); - - /* IP fragmentation */ - ip_frag_set_vnet_buffer (p0, adj0[0].rewrite_header.max_l3_packet_bytes, - IP4_FRAG_NEXT_MPLS_OUTPUT, - ((vnet_buffer (p0)->mpls.pyld_proto == DPO_PROTO_IP4) ? IP_FRAG_FLAG_IP4_HEADER:IP_FRAG_FLAG_IP6_HEADER)); - - /* Tell ip_frag to retain certain mpls parameters after fragmentation of mpls packet */ - vnet_buffer (p0)->ip_frag.flags = (vnet_buffer (p0)->ip_frag.flags | IP_FRAG_FLAG_MPLS_HEADER); - next0 = (vnet_buffer (p0)->mpls.pyld_proto == DPO_PROTO_IP4)? MPLS_OUTPUT_NEXT_IP4_FRAG:MPLS_OUTPUT_NEXT_IP6_FRAG; - - return next0; -} - static inline uword mpls_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, @@ -196,7 +170,7 @@ mpls_output_inline (vlib_main_t * vm, else { error0 = IP4_ERROR_MTU_EXCEEDED; - next0 = set_mpls_fragmentation (p0, adj0); + next0 = MPLS_OUTPUT_NEXT_FRAG; vlib_node_increment_counter (vm, mpls_output_node.index, MPLS_ERROR_PKTS_NEED_FRAG, 1); @@ -219,7 +193,7 @@ mpls_output_inline (vlib_main_t * vm, else { error1 = IP4_ERROR_MTU_EXCEEDED; - next1 = set_mpls_fragmentation (p1, adj1); + next1 = MPLS_OUTPUT_NEXT_FRAG; vlib_node_increment_counter (vm, mpls_output_node.index, MPLS_ERROR_PKTS_NEED_FRAG, 1); @@ -308,7 +282,7 @@ mpls_output_inline (vlib_main_t * vm, else { error0 = IP4_ERROR_MTU_EXCEEDED; - next0 = set_mpls_fragmentation (p0, adj0); + next0 = MPLS_OUTPUT_NEXT_FRAG; vlib_node_increment_counter (vm, mpls_output_node.index, MPLS_ERROR_PKTS_NEED_FRAG, 1); @@ -371,11 +345,9 @@ VLIB_REGISTER_NODE (mpls_output_node) = { .n_next_nodes = MPLS_OUTPUT_N_NEXT, .next_nodes = { -#define _(s,n) [MPLS_OUTPUT_NEXT_##s] = n, - foreach_mpls_output_next -#undef _ - }, - + [MPLS_OUTPUT_NEXT_DROP] = "mpls-drop", + [MPLS_OUTPUT_NEXT_FRAG] = "mpls-frag", + }, .format_trace = format_mpls_output_trace, }; @@ -390,12 +362,184 @@ VLIB_REGISTER_NODE (mpls_midchain_node) = { .name = "mpls-midchain", .vector_size = sizeof (u32), - .format_trace = format_mpls_output_trace, + .n_errors = MPLS_N_ERROR, + .error_strings = mpls_error_strings, .sibling_of = "mpls-output", + .format_trace = format_mpls_output_trace, }; -/** +static char *mpls_frag_error_strings[] = { +#define _(sym,string) string, + foreach_ip_frag_error +#undef _ +}; + +typedef struct mpls_frag_trace_t_ +{ + u16 pkt_size; + u16 mtu; +} mpls_frag_trace_t; + +typedef enum +{ + MPLS_FRAG_NEXT_REWRITE, + MPLS_FRAG_NEXT_REWRITE_MIDCHAIN, + MPLS_FRAG_NEXT_ICMP_ERROR, + MPLS_FRAG_NEXT_DROP, + MPLS_FRAG_N_NEXT, +} mpls_frag_next_t; + +static uword +mpls_frag (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, next_index, * from, * to_next, n_left_to_next, *frags; + vlib_node_runtime_t * error_node; + + error_node = vlib_node_get_runtime (vm, mpls_output_node.index); + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + frags = NULL; + + while (n_left_from > 0) + { + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + ip_adjacency_t * adj0; + vlib_buffer_t * p0; + mpls_frag_next_t next0; + u32 pi0, adj_index0; + ip_frag_error_t error0 = IP_FRAG_ERROR_NONE; + i16 encap_size; + u8 is_ip4; + + pi0 = to_next[0] = from[0]; + p0 = vlib_get_buffer (vm, pi0); + from += 1; + n_left_from -= 1; + is_ip4 = vnet_buffer (p0)->mpls.pyld_proto == DPO_PROTO_IP4; + + adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; + adj0 = adj_get(adj_index0); + + /* the size of the MPLS stack */ + encap_size = vnet_buffer(p0)->l3_hdr_offset - p0->current_data; + + /* IP fragmentation */ + if (is_ip4) + error0 = ip4_frag_do_fragment (vm, pi0, + adj0->rewrite_header.max_l3_packet_bytes, + encap_size, &frags); + else + error0 = ip6_frag_do_fragment (vm, pi0, + adj0->rewrite_header.max_l3_packet_bytes, + encap_size, &frags); + + if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED)) + { + mpls_frag_trace_t *tr = + vlib_add_trace (vm, node, p0, sizeof (*tr)); + tr->mtu = adj0->rewrite_header.max_l3_packet_bytes; + tr->pkt_size = vlib_buffer_length_in_chain(vm, p0); + } + + if (PREDICT_TRUE(error0 == IP_FRAG_ERROR_NONE)) + { + /* Free original buffer chain */ + vlib_buffer_free_one (vm, pi0); /* Free original packet */ + next0 = (IP_LOOKUP_NEXT_MIDCHAIN == adj0->lookup_next_index ? + MPLS_FRAG_NEXT_REWRITE_MIDCHAIN : + MPLS_FRAG_NEXT_REWRITE); + } + else if (is_ip4 && error0 == IP_FRAG_ERROR_DONT_FRAGMENT_SET) + { + icmp4_error_set_vnet_buffer ( + p0, ICMP4_destination_unreachable, + ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set, + vnet_buffer (p0)->ip_frag.mtu); + next0 = MPLS_FRAG_NEXT_ICMP_ERROR; + } + else + { + vlib_error_count (vm, next_index, error0, 1); + vec_add1 (frags, pi0); /* Get rid of the original buffer */ + next0 = MPLS_FRAG_NEXT_DROP; + } + + /* Send fragments that were added in the frame */ + u32 *frag_from, frag_left; + + frag_from = frags; + frag_left = vec_len (frags); + + while (frag_left > 0) + { + while (frag_left > 0 && n_left_to_next > 0) + { + u32 i; + i = to_next[0] = frag_from[0]; + frag_from += 1; + frag_left -= 1; + to_next += 1; + n_left_to_next -= 1; + + p0 = vlib_get_buffer (vm, i); + p0->error = error_node->errors[error0]; + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, i, + next0); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + vlib_get_next_frame (vm, node, next_index, to_next, + n_left_to_next); + } + vec_reset_length (frags); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vec_free (frags); + + return frame->n_vectors; +} + +static u8 * +format_mpls_frag_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 *); + mpls_frag_trace_t *t = va_arg (*args, mpls_frag_trace_t *); + + s = format (s, "mtu:%d pkt-size:%d", t->mtu, t->pkt_size); + return s; +} + +VLIB_REGISTER_NODE (mpls_frag_node) = { + .function = mpls_frag, + .name = "mpls-frag", + .vector_size = sizeof (u32), + .format_trace = format_mpls_frag_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = IP_FRAG_N_ERROR, + .error_strings = mpls_frag_error_strings, + + .n_next_nodes = MPLS_FRAG_N_NEXT, + .next_nodes = { + [MPLS_FRAG_NEXT_REWRITE] = "mpls-output", + [MPLS_FRAG_NEXT_REWRITE_MIDCHAIN] = "mpls-midchain", + [MPLS_FRAG_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [MPLS_FRAG_NEXT_DROP] = "mpls-drop" + }, +}; + +/* * @brief Next index values from the MPLS incomplete adj node */ #define foreach_mpls_adj_incomplete_next \ |