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* ipv6: rpl: fix full address compressionAlexander Aring2020-04-181-3/+4
| | | | | | | | | | | | | | | | | | | | | | | This patch makes it impossible that cmpri or cmpre values are set to the value 16 which is not possible, because these are 4 bit values. We currently run in an overflow when assigning the value 16 to it. According to the standard a value of 16 can be interpreted as a full elided address which isn't possible to set as compression value. A reason why this cannot be set is that the current ipv6 header destination address should never show up inside the segments of the rpl header. In this case we run in a overflow and the address will have no compression at all. Means cmpri or compre is set to 0. As we handle cmpri and cmpre sometimes as unsigned char or 4 bit value inside the rpl header the current behaviour ends in an invalid header format. This patch simple use the best compression method if we ever run into the case that the destination address is showed up inside the rpl segments. We avoid the overflow handling and the rpl header is still valid, even when we have the destination address inside the rpl segments. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv6: rpl: fix loop iterationAlexander Aring2020-04-061-3/+3
| | | | | | | | | | | | | | | This patch fix the loop iteration by not walking over the last iteration. The cmpri compressing value exempt the last segment. As the code shows the last iteration will be overwritten by cmpre value handling which is for the last segment. I think this doesn't end in any bufferoverflows because we work on worst case temporary buffer sizes but it ends in not best compression settings in some cases. Fixes: 8610c7c6e3bd ("net: ipv6: add support for rpl sr exthdr") Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: ipv6: add support for rpl sr exthdrAlexander Aring2020-03-291-0/+123
This patch adds rpl source routing receive handling. Everything works only if sysconf "rpl_seg_enabled" and source routing is enabled. Mostly the same behaviour as IPv6 segmentation routing. To handle compression and uncompression a rpl.c file is created which contains the necessary functionality. The receive handling will also care about IPv6 encapsulated so far it's specified as possible nexthdr in RFC 6554. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>