From: Sam Protsenko <semen.protse...@linaro.org> Date: Fri, 14 Dec 2018 19:59:21 +0200
> When Protocol Field Compression (PFC) is enabled, the "Protocol" field > in PPP packet will be received without leading 0x00. See section 6.5 in > RFC 1661 for details. So let's decompress protocol field if needed, the > same way it's done in drivers/net/ppp/pptp.c. > > In case when "nopcomp" pppd option is not enabled, PFC (pcomp) can be > negotiated during LCP handshake, and L2TP driver in kernel will receive > PPP packets with compressed Protocol field, which in turn leads to next > error: > > Protocol Rejected (unsupported protocol 0x2145) > > because instead of Protocol=0x0021 in PPP packet there will be > Protocol=0x21. This patch unwraps it back to 0x0021, which fixes the > issue. > > Sending the compressed Protocol field will be implemented in subsequent > patch, this one is self-sufficient. > > Signed-off-by: Sam Protsenko <semen.protse...@linaro.org> Applied, thanks.
