lisp: Move to plugin

Type: refactor

Change-Id: I54df533a8f863c4e49742903cf2457f18b4fc506
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 226 insertions, 0 deletions

diff --git a/src/plugins/lisp/lisp-cp/packets.c b/src/plugins/lisp/lisp-cp/packets.c
new file mode 100644
index 00000000000..95f95cdb68a
--- /dev/null
+++ b/src/plugins/lisp/lisp-cp/packets.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2016 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 <lisp/lisp-cp/packets.h>
+#include <lisp/lisp-cp/lisp_cp_messages.h>
+#include <vnet/udp/udp_packet.h>
+
+/* Returns IP ID for the packet */
+/* static u16 ip_id = 0;
+static inline u16
+get_IP_ID()
+{
+    ip_id++;
+    return (ip_id);
+} */
+
+u16
+udp_ip4_checksum (const void *b, u32 len, u8 * src, u8 * dst)
+{
+  const u16 *buf = b;
+  u16 *ip_src = (u16 *) src;
+  u16 *ip_dst = (u16 *) dst;
+  u32 length = len;
+  u32 sum = 0;
+
+  while (len > 1)
+    {
+      sum += *buf++;
+      if (sum & 0x80000000)
+	sum = (sum & 0xFFFF) + (sum >> 16);
+      len -= 2;
+    }
+
+  /* Add the padding if the packet length is odd */
+  if (len & 1)
+    sum += *((u8 *) buf);
+
+  /* Add the pseudo-header */
+  sum += *(ip_src++);
+  sum += *ip_src;
+
+  sum += *(ip_dst++);
+  sum += *ip_dst;
+
+  sum += clib_host_to_net_u16 (IP_PROTOCOL_UDP);
+  sum += clib_host_to_net_u16 (length);
+
+  /* Add the carries */
+  while (sum >> 16)
+    sum = (sum & 0xFFFF) + (sum >> 16);
+
+  /* Return the one's complement of sum */
+  return ((u16) (~sum));
+}
+
+u16
+udp_ip6_checksum (ip6_header_t * ip6, udp_header_t * up, u32 len)
+{
+  size_t i;
+  register const u16 *sp;
+  u32 sum;
+  union
+  {
+    struct
+    {
+      ip6_address_t ph_src;
+      ip6_address_t ph_dst;
+      u32 ph_len;
+      u8 ph_zero[3];
+      u8 ph_nxt;
+    } ph;
+    u16 pa[20];
+  } phu;
+
+  /* pseudo-header */
+  clib_memset (&phu, 0, sizeof (phu));
+  phu.ph.ph_src = ip6->src_address;
+  phu.ph.ph_dst = ip6->dst_address;
+  phu.ph.ph_len = clib_host_to_net_u32 (len);
+  phu.ph.ph_nxt = IP_PROTOCOL_UDP;
+
+  sum = 0;
+  for (i = 0; i < sizeof (phu.pa) / sizeof (phu.pa[0]); i++)
+    sum += phu.pa[i];
+
+  sp = (const u16 *) up;
+
+  for (i = 0; i < (len & ~1); i += 2)
+    sum += *sp++;
+
+  if (len & 1)
+    sum += clib_host_to_net_u16 ((*(const u8 *) sp) << 8);
+
+  while (sum > 0xffff)
+    sum = (sum & 0xffff) + (sum >> 16);
+  sum = ~sum & 0xffff;
+
+  return (sum);
+}
+
+u16
+udp_checksum (udp_header_t * uh, u32 udp_len, void *ih, u8 version)
+{
+  switch (version)
+    {
+    case AF_IP4:
+      return (udp_ip4_checksum (uh, udp_len,
+				((ip4_header_t *) ih)->src_address.as_u8,
+				((ip4_header_t *) ih)->dst_address.as_u8));
+    case AF_IP6:
+      return (udp_ip6_checksum (ih, uh, udp_len));
+    default:
+      return ~0;
+    }
+}
+
+void *
+pkt_push_udp (vlib_main_t * vm, vlib_buffer_t * b, u16 sp, u16 dp)
+{
+  udp_header_t *uh;
+  u16 udp_len = sizeof (udp_header_t) + vlib_buffer_length_in_chain (vm, b);
+
+  uh = vlib_buffer_push_uninit (b, sizeof (*uh));
+
+  uh->src_port = clib_host_to_net_u16 (sp);
+  uh->dst_port = clib_host_to_net_u16 (dp);
+  uh->length = clib_host_to_net_u16 (udp_len);
+  uh->checksum = 0;
+  return uh;
+}
+
+void *
+pkt_push_ip (vlib_main_t * vm, vlib_buffer_t * b, ip_address_t * src,
+	     ip_address_t * dst, u32 proto, u8 csum_offload)
+{
+  if (ip_addr_version (src) != ip_addr_version (dst))
+    {
+      clib_warning ("src %U and dst %U IP have different AFI! Discarding!",
+		    format_ip_address, src, format_ip_address, dst);
+      return 0;
+    }
+
+  switch (ip_addr_version (src))
+    {
+    case AF_IP4:
+      return vlib_buffer_push_ip4 (vm, b, &ip_addr_v4 (src),
+				   &ip_addr_v4 (dst), proto, csum_offload);
+      break;
+    case AF_IP6:
+      return vlib_buffer_push_ip6 (vm, b, &ip_addr_v6 (src),
+				   &ip_addr_v6 (dst), proto);
+      break;
+    }
+
+  return 0;
+}
+
+void *
+pkt_push_udp_and_ip (vlib_main_t * vm, vlib_buffer_t * b, u16 sp, u16 dp,
+		     ip_address_t * sip, ip_address_t * dip, u8 csum_offload)
+{
+  u16 udpsum;
+  udp_header_t *uh;
+  void *ih;
+
+  uh = pkt_push_udp (vm, b, sp, dp);
+
+  if (csum_offload)
+    {
+      ih = pkt_push_ip (vm, b, sip, dip, IP_PROTOCOL_UDP, 1);
+      b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+      vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
+      vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
+      uh->checksum = 0;
+    }
+  else
+    {
+      ih = pkt_push_ip (vm, b, sip, dip, IP_PROTOCOL_UDP, 0);
+      udpsum = udp_checksum (uh, clib_net_to_host_u16 (uh->length), ih,
+			     ip_addr_version (sip));
+      if (udpsum == (u16) ~ 0)
+	{
+	  clib_warning ("Failed UDP checksum! Discarding");
+	  return 0;
+	}
+      /* clear flags used for csum since we're not offloading */
+      b->flags &= ~(VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_IS_IP6);
+      uh->checksum = udpsum;
+    }
+  return ih;
+}
+
+void *
+pkt_push_ecm_hdr (vlib_buffer_t * b)
+{
+  ecm_hdr_t *h;
+  h = vlib_buffer_push_uninit (b, sizeof (h[0]));
+
+  clib_memset (h, 0, sizeof (h[0]));
+  h->type = LISP_ENCAP_CONTROL_TYPE;
+  clib_memset (h->reserved2, 0, sizeof (h->reserved2));
+
+  return h;
+}
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */