From c0aef7dd6b5bfe9f5f2ac90c1c35b0c4597eff88 Mon Sep 17 00:00:00 2001
From: Sylvain Rochet <gradator@gradator.net>
Date: Sat, 12 Apr 2014 01:23:57 +0200
Subject: [PATCH] PPP, VJ compression enabled, fixed IP forward from PPP to
 Ethernet by allocating a PBUF_LINK instead of a PBUF_RAW if IP forwarding is
 enabled

---
 src/netif/ppp/vj.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/netif/ppp/vj.c b/src/netif/ppp/vj.c
index 792e16c9..5c195909 100644
--- a/src/netif/ppp/vj.c
+++ b/src/netif/ppp/vj.c
@@ -593,7 +593,15 @@ vj_uncompress_tcp(struct pbuf **nb, struct vjcompress *comp)
     struct pbuf *np, *q;
     u8_t *bufptr;
 
+#if IP_FORWARD
+    /* If IP forwarding is enabled we are using a PBUF_LINK packet type so
+     * the packet is being allocated with enough header space to be
+     * forwarded (to Ethernet for example).
+     */
+    np = pbuf_alloc(PBUF_LINK, n0->len + cs->cs_hlen, PBUF_POOL);
+#else /* IP_FORWARD */
     np = pbuf_alloc(PBUF_RAW, n0->len + cs->cs_hlen, PBUF_POOL);
+#endif /* IP_FORWARD */
     if(!np) {
       PPPDEBUG(LOG_WARNING, ("vj_uncompress_tcp: realign failed\n"));
       goto bad;