[lwip-commits] [SCM] lwIP - A Lightweight TCPIP stack branch, master, updated. 4beacc4ca0b2dd166dd50b1b8614f87fe0b67516

[Sylvain Rochet]

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- Log -----------------------------------------------------------------
commit 4beacc4ca0b2dd166dd50b1b8614f87fe0b67516
Author: Sylvain Rochet <address@hidden>
Date:   Sun Jan 24 20:07:54 2016 +0100

    PPP, VJ, fixed TCP retransmission
    
    We used to modify in place the packet payload during compression but TCP
    stack requires that we don't change the packet payload, therefore we now
    copy the whole packet before compression.
    
    Signed-off-by: Sylvain Rochet <address@hidden>

commit 9c7231ee754bbfcf19bff98ee13f6c82717acdb6
Author: Sylvain Rochet <address@hidden>
Date:   Sun Jan 24 19:36:19 2016 +0100

    PPP, VJ, move pbuf length check so all TYPE_IP return value are within the 
same code block
    
    Prepare for VJ packet copy, reorder a bit VJ compressor so all TYPE_IP
    return value are within the same code block. We do that because we don't
    need to copy the packet if we are not able to compress it.
    
    Signed-off-by: Sylvain Rochet <address@hidden>

commit e31902dc4cb1ceec375b34d925be48a16983a485
Author: Sylvain Rochet <address@hidden>
Date:   Sun Jan 24 17:48:57 2016 +0100

    PPP, prepare for chained compressors (e.g. VJ+MPPE) requiring packet copy
    
    lwIP TCP stack requires that we don't change the packet payload in netif
    output functions in order to resend the pbuf if we don't receive a TCP
    ACK in time, therefore we copy the whole packet before compression or
    encryption.
    
    It gets tricky because we should keep track of whether we previously
    copied the buffer in PPP output netif function in order to free the
    previous pbuf if necessary, BUT the first pbuf passed to the netif
    output function must not be freed.
    
    The worst case is VJ compression followed by MPPE encryption, in this
    case we should free the packet allocated by VJ compressor after MPPE
    encryption and we should free the packet allocated by MPPE encrypter
    after calling the PPP low level output function.
    
    Signed-off-by: Sylvain Rochet <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 src/include/netif/ppp/vj.h |    2 +-
 src/netif/ppp/ppp.c        |   40 ++++++++++++++++++++--------
 src/netif/ppp/vj.c         |   61 ++++++++++++++++++++++++++-----------------
 3 files changed, 66 insertions(+), 37 deletions(-)


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