+++ /dev/null
---- linux-2.4.19/drivers/net/ppp_generic.c.orig Mon May 12 01:36:31 2003
-+++ linux-2.4.19/drivers/net/ppp_generic.c Mon May 12 03:09:13 2003
-@@ -99,6 +99,7 @@
- spinlock_t rlock; /* lock for receive side 58 */
- spinlock_t wlock; /* lock for transmit side 5c */
- int mru; /* max receive unit 60 */
-+ int mru_alloc; /* MAX(1500,MRU) for dev_alloc_skb() */
- unsigned int flags; /* control bits 64 */
- unsigned int xstate; /* transmit state bits 68 */
- unsigned int rstate; /* receive state bits 6c */
-@@ -126,6 +127,7 @@
- struct sock_fprog pass_filter; /* filter for packets to pass */
- struct sock_fprog active_filter;/* filter for pkts to reset idle */
- #endif /* CONFIG_PPP_FILTER */
-+ int xpad; /* ECP or CCP (MPPE) transmit padding */
- };
-
- /*
-@@ -531,6 +533,8 @@
- if (get_user(val, (int *) arg))
- break;
-- ppp->mru = val;
-+ ppp->mru_alloc = ppp->mru = val;
-+ if (ppp->mru_alloc < PPP_MRU)
-+ ppp->mru_alloc = PPP_MRU; /* increase for broken peers */
- err = 0;
- break;
-
-@@ -1006,8 +1010,8 @@
- /* try to do packet compression */
- if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
- && proto != PPP_LCP && proto != PPP_CCP) {
-- new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
-- GFP_ATOMIC);
-+ new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len
-+ + ppp->xpad, GFP_ATOMIC);
- if (new_skb == 0) {
- printk(KERN_ERR "PPP: no memory (comp pkt)\n");
- goto drop;
-@@ -1019,15 +1023,28 @@
- /* compressor still expects A/C bytes in hdr */
- len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
- new_skb->data, skb->len + 2,
-- ppp->dev->mtu + PPP_HDRLEN);
-+ ppp->dev->mtu + ppp->xpad
-+ + PPP_HDRLEN);
- if (len > 0 && (ppp->flags & SC_CCP_UP)) {
- kfree_skb(skb);
- skb = new_skb;
- skb_put(skb, len);
- skb_pull(skb, 2); /* pull off A/C bytes */
-- } else {
-+ } else if (len == 0) {
- /* didn't compress, or CCP not up yet */
- kfree_skb(new_skb);
-+ } else {
-+ /*
-+ * (len < 0)
-+ * MPPE requires that we do not send unencrypted
-+ * frames. The compressor will return -1 if we
-+ * should drop the frame. We cannot simply test
-+ * the compress_proto because MPPE and MPPC share
-+ * the same number.
-+ */
-+ printk(KERN_ERR "ppp: compressor dropped pkt\n");
-+ kfree_skb(new_skb);
-+ goto drop;
- }
- }
-
-@@ -1515,14 +1532,15 @@
- int len;
-
- if (proto == PPP_COMP) {
-- ns = dev_alloc_skb(ppp->mru + PPP_HDRLEN);
-+ ns = dev_alloc_skb(ppp->mru_alloc + PPP_HDRLEN);
- if (ns == 0) {
- printk(KERN_ERR "ppp_decompress_frame: no memory\n");
- goto err;
- }
- /* the decompressor still expects the A/C bytes in the hdr */
- len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
-- skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN);
-+ skb->len + 2, ns->data,
-+ ppp->mru_alloc + PPP_HDRLEN);
- if (len < 0) {
- /* Pass the compressed frame to pppd as an
- error indication. */
-@@ -1949,6 +1967,20 @@
- ppp_xmit_unlock(ppp);
- err = 0;
- }
-+ if (ccp_option[0] == CI_MPPE)
-+ /*
-+ * pppd (userland) has reduced the MTU by MPPE_PAD,
-+ * to accomodate "compressor" growth. We must
-+ * increase the space allocated for compressor
-+ * output in ppp_send_frame() accordingly. Note
-+ * that from a purist's view, it may be more correct
-+ * to require multilink and fragment large packets,
-+ * but that seems inefficient compared to this
-+ * little trick.
-+ */
-+ ppp->xpad = MPPE_PAD;
-+ else
-+ ppp->xpad = 0;
-
- } else {
- ppp_recv_lock(ppp);
-@@ -2229,6 +2261,7 @@
-
- ppp->file.index = unit;
- ppp->mru = PPP_MRU;
-+ ppp->mru_alloc = PPP_MRU;
- init_ppp_file(&ppp->file, INTERFACE);
- ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
- for (i = 0; i < NUM_NP; ++i)
projects / ppp.git / blobdiff