gso: fix the header parser to read only

[vpp.git] / src / vnet / gso / gso.h

diff --git a/src/vnet/gso/gso.h b/src/vnet/gso/gso.h
index 8e174df..0e46c36 100644 (file)
--- a/src/vnet/gso/gso.h
+++ b/src/vnet/gso/gso.h
@@ -16,8 +16,23 @@
 #ifndef included_gso_h
 #define included_gso_h
 
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp_packet.h>
 #include <vnet/vnet.h>
 
+typedef struct
+{
+  i16 l2_hdr_offset;
+  i16 l3_hdr_offset;
+  i16 l4_hdr_offset;
+  u16 l4_hdr_sz;
+  i16 outer_l2_hdr_offset;
+  i16 outer_l3_hdr_offset;
+  i16 outer_l4_hdr_offset;
+} gso_header_offset_t;
+
 typedef struct
 {
   vlib_main_t *vlib_main;
@@ -29,6 +44,84 @@ extern gso_main_t gso_main;
 
 int vnet_sw_interface_gso_enable_disable (u32 sw_if_index, u8 enable);
 
+static_always_inline gso_header_offset_t
+vnet_gso_header_offset_parser (vlib_buffer_t * b0, int is_ip6)
+{
+  gso_header_offset_t gho = { 0 };
+  u8 l4_proto = 0;
+  u8 l4_hdr_sz = 0;
+
+  if (PREDICT_TRUE ((b0->flags & (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+                                 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+                                 VNET_BUFFER_F_L4_HDR_OFFSET_VALID)) ==
+                   (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID)))
+    {
+      gho.l2_hdr_offset = vnet_buffer (b0)->l2_hdr_offset;
+      gho.l3_hdr_offset = vnet_buffer (b0)->l3_hdr_offset;
+      gho.l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset;
+      gho.l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz;
+      return gho;
+    }
+
+  ethernet_header_t *eh = (ethernet_header_t *) vlib_buffer_get_current (b0);
+  u16 ethertype = clib_net_to_host_u16 (eh->type);
+  u16 l2hdr_sz = sizeof (ethernet_header_t);
+
+  if (ethernet_frame_is_tagged (ethertype))
+    {
+      ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
+
+      ethertype = clib_net_to_host_u16 (vlan->type);
+      l2hdr_sz += sizeof (*vlan);
+      if (ethertype == ETHERNET_TYPE_VLAN)
+       {
+         vlan++;
+         ethertype = clib_net_to_host_u16 (vlan->type);
+         l2hdr_sz += sizeof (*vlan);
+       }
+    }
+
+  gho.l2_hdr_offset = b0->current_data;
+  gho.l3_hdr_offset = l2hdr_sz;
+
+  if (PREDICT_TRUE (is_ip6 == 0))
+    {
+      ip4_header_t *ip4 =
+       (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
+      gho.l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
+      l4_proto = ip4->protocol;
+    }
+  else if (PREDICT_TRUE (is_ip6))
+    {
+      ip6_header_t *ip6 =
+       (ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
+      /* FIXME IPv6 EH traversal */
+      gho.l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
+      l4_proto = ip6->protocol;
+    }
+  if (l4_proto == IP_PROTOCOL_TCP)
+    {
+      tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
+                                           gho.l4_hdr_offset);
+      l4_hdr_sz = tcp_header_bytes (tcp);
+    }
+  else if (l4_proto == IP_PROTOCOL_UDP)
+    {
+      udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) +
+                                           gho.l4_hdr_offset);
+      l4_hdr_sz = sizeof (*udp);
+    }
+
+  if (b0->flags & (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_IS_IP6))
+    {
+      gho.l4_hdr_sz = l4_hdr_sz;
+    }
+
+  return gho;
+}
+
 #endif /* included_gso_h */
 
 /*