small performance improvement in download (internet -> customer)

[l2tpns.git] / pppoe.c

diff --git a/pppoe.c b/pppoe.c
index 52b554e..4b196ea 100644 (file)
--- a/pppoe.c
+++ b/pppoe.c
@@ -1,6 +1,7 @@
 /*
  * Fernando ALVES 2013
  * Add functionality "server pppoe" to l2tpns.
+ * inspiration pppoe.c of accel-ppp
  * GPL licenced
  */
 
@@ -762,6 +763,72 @@ uint8_t *pppoe_makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tu
        return b;
 }
 
+// fill in a PPPOE message with a PPP frame,
+// returns start of PPP frame
+//(note: THIS ROUTINE WRITES TO p[-28]).
+uint8_t *opt_pppoe_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits)
+{
+       uint16_t type = mtype;
+       uint16_t hdrlen = l;
+       uint8_t *b = p;
+       struct pppoe_hdr *hdr;
+
+       if (t != TUNNEL_ID_PPPOE)
+               return NULL;
+
+       // Check whether this session is part of multilink
+       if (bid)
+       {
+               if (bundle[bid].num_of_links > 1)
+                       type = PPPMP; // Change PPP message type to the PPPMP
+               else
+                       bid = 0;
+       }
+
+       if (bid)
+       {
+               // Add the message type if this fragment has the begin bit set
+               if (mp_bits & MP_BEGIN)
+               {
+                       b -= 2;
+                       *(uint16_t *) b = htons(mtype); // Message type
+               }
+
+               // Set the sequence number and (B)egin (E)nd flags
+               if (session[s].mssf)
+               {
+                       // Set the multilink bits
+                       uint16_t bits_send = mp_bits;
+                       b -= 2;
+                       *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
+               }
+               else
+               {
+                       b -= 4;
+                       *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
+                       // Set the multilink bits
+                       *b = mp_bits;
+               }
+
+               bundle[bid].seq_num_t++;
+       }
+
+       b -= 2;
+       *(uint16_t *) b = htons(type);
+
+       // Size ppp packet
+       hdrlen += (p - b);
+
+       // 14 bytes ethernet Header + 6 bytes header pppoe
+       b -= (ETH_HLEN + sizeof(*hdr));
+       setup_header(b, config->pppoe_hwaddr, session[s].src_hwaddr, CODE_SESS, s, ETH_P_PPP_SES);
+       hdr = (struct pppoe_hdr *)(b + ETH_HLEN);
+       // Store length on header pppoe
+       hdr->length = hdrlen;
+
+       return b;
+}
+
 // pppoe discovery recv data
 void process_pppoe_disc(uint8_t *pack, int size)
 {