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authorRajesh Goel <rajegoel@cisco.com>2019-10-06 13:17:36 +0530
committerOle Trøan <otroan@employees.org>2019-10-09 09:20:51 +0000
commitd6f1c9c5141c177a14d011a514e392a9357398fb (patch)
treec4a08dd88f69035ae659301980a97fe83923f85a /src/vnet/mpls
parentab96454e3aba8e60094e773a39e9d28f50d7192e (diff)
mpls: support fragmentation of mpls output packet
Type: fix Signed-off-by: Rajesh Goel <rajegoel@cisco.com> Change-Id: Ie4372c5cf58ab215cdec5ce56f8a994daaba2844
Diffstat (limited to 'src/vnet/mpls')
-rw-r--r--src/vnet/mpls/error.def1
-rw-r--r--src/vnet/mpls/mpls_output.c70
2 files changed, 57 insertions, 14 deletions
diff --git a/src/vnet/mpls/error.def b/src/vnet/mpls/error.def
index 34a46522894..9941b18baf4 100644
--- a/src/vnet/mpls/error.def
+++ b/src/vnet/mpls/error.def
@@ -20,6 +20,7 @@ mpls_error (UNKNOWN_PROTOCOL, "unknown protocol")
mpls_error (UNSUPPORTED_VERSION, "unsupported version")
mpls_error (PKTS_DECAP, "MPLS input packets decapsulated")
mpls_error (PKTS_ENCAP, "MPLS output packets encapsulated")
+mpls_error (PKTS_NEED_FRAG, "MPLS output packets needs fragmentation")
mpls_error (NO_LABEL, "MPLS no label for fib/dst")
mpls_error (TTL_EXPIRED, "MPLS ttl expired")
mpls_error (S_NOT_SET, "MPLS s-bit not set")
diff --git a/src/vnet/mpls/mpls_output.c b/src/vnet/mpls/mpls_output.c
index 68577e711cc..5ede22aa410 100644
--- a/src/vnet/mpls/mpls_output.c
+++ b/src/vnet/mpls/mpls_output.c
@@ -19,6 +19,7 @@
#include <vnet/pg/pg.h>
#include <vnet/ip/ip.h>
#include <vnet/mpls/mpls.h>
+#include <vnet/ip/ip_frag.h>
typedef struct {
/* Adjacency taken. */
@@ -26,8 +27,15 @@ typedef struct {
u32 flow_hash;
} mpls_output_trace_t;
+typedef enum {
+ MPLS_OUTPUT_MODE,
+ MPLS_OUTPUT_MIDCHAIN_MODE
+}mpls_output_mode_t;
+
#define foreach_mpls_output_next \
-_(DROP, "error-drop")
+_(DROP, "error-drop") \
+_(IP4_FRAG, "ip4-frag") \
+_(IP6_FRAG, "ip6-frag")
typedef enum {
#define _(s,n) MPLS_OUTPUT_NEXT_##s,
@@ -50,11 +58,36 @@ 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,
vlib_frame_t * from_frame,
- int is_midchain)
+ mpls_output_mode_t mode)
{
u32 n_left_from, next_index, * from, * to_next, thread_index;
vlib_node_runtime_t * error_node;
@@ -162,8 +195,11 @@ mpls_output_inline (vlib_main_t * vm,
}
else
{
- error0 = IP4_ERROR_MTU_EXCEEDED;
- next0 = MPLS_OUTPUT_NEXT_DROP;
+ error0 = IP4_ERROR_MTU_EXCEEDED;
+ next0 = set_mpls_fragmentation (p0, adj0);
+ vlib_node_increment_counter (vm, mpls_output_node.index,
+ MPLS_ERROR_PKTS_NEED_FRAG,
+ 1);
}
if (PREDICT_TRUE(vlib_buffer_length_in_chain (vm, p1) <=
adj1[0].rewrite_header.max_l3_packet_bytes))
@@ -182,10 +218,13 @@ mpls_output_inline (vlib_main_t * vm,
}
else
{
- error1 = IP4_ERROR_MTU_EXCEEDED;
- next1 = MPLS_OUTPUT_NEXT_DROP;
+ error1 = IP4_ERROR_MTU_EXCEEDED;
+ next1 = set_mpls_fragmentation (p1, adj1);
+ vlib_node_increment_counter (vm, mpls_output_node.index,
+ MPLS_ERROR_PKTS_NEED_FRAG,
+ 1);
}
- if (is_midchain)
+ if (mode == MPLS_OUTPUT_MIDCHAIN_MODE)
{
adj0->sub_type.midchain.fixup_func
(vm, adj0, p0,
@@ -221,7 +260,7 @@ mpls_output_inline (vlib_main_t * vm,
while (n_left_from > 0 && n_left_to_next > 0)
{
ip_adjacency_t * adj0;
- mpls_unicast_header_t *hdr0;
+ mpls_unicast_header_t *hdr0;
vlib_buffer_t * p0;
u32 pi0, adj_index0, next0, error0;
word rw_len0;
@@ -233,7 +272,7 @@ mpls_output_inline (vlib_main_t * vm,
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj0 = adj_get(adj_index0);
- hdr0 = vlib_buffer_get_current (p0);
+ hdr0 = vlib_buffer_get_current (p0);
/* Guess we are only writing on simple Ethernet header. */
vnet_rewrite_one_header (adj0[0], hdr0,
@@ -268,10 +307,13 @@ mpls_output_inline (vlib_main_t * vm,
}
else
{
- error0 = IP4_ERROR_MTU_EXCEEDED;
- next0 = MPLS_OUTPUT_NEXT_DROP;
+ error0 = IP4_ERROR_MTU_EXCEEDED;
+ next0 = set_mpls_fragmentation (p0, adj0);
+ vlib_node_increment_counter (vm, mpls_output_node.index,
+ MPLS_ERROR_PKTS_NEED_FRAG,
+ 1);
}
- if (is_midchain)
+ if (mode == MPLS_OUTPUT_MIDCHAIN_MODE)
{
adj0->sub_type.midchain.fixup_func
(vm, adj0, p0,
@@ -317,7 +359,7 @@ VLIB_NODE_FN (mpls_output_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
- return (mpls_output_inline(vm, node, from_frame, /* is_midchain */ 0));
+ return (mpls_output_inline(vm, node, from_frame, MPLS_OUTPUT_MODE));
}
VLIB_REGISTER_NODE (mpls_output_node) = {
@@ -341,7 +383,7 @@ VLIB_NODE_FN (mpls_midchain_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
- return (mpls_output_inline(vm, node, from_frame, /* is_midchain */ 1));
+ return (mpls_output_inline(vm, node, from_frame, MPLS_OUTPUT_MIDCHAIN_MODE));
}
VLIB_REGISTER_NODE (mpls_midchain_node) = {