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| author | Dan Williams <dan.j.williams@intel.com> | 2022-09-24 18:14:12 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-09-24 18:14:12 -0700 |
| commit | b3bbcc5d1da1b654091dad15980b3d58fdae0fc6 (patch) | |
| tree | 77795fbece4fc61a659ed97c70d798ca81f35bb8 /include/linux/ppp_defs.h | |
| parent | 17d9c15c9b9e7fb285f7ac5367dfb5f00ff575e3 (diff) | |
| parent | 67feaba413ec68daf4124e9870878899b4ed9a0e (diff) | |
Merge branch 'for-6.0/dax' into libnvdimm-fixes
Pick up another "Soft Reservation" fix for v6.0-final on top of some
straggling nvdimm fixes that missed v5.19.
Diffstat (limited to 'include/linux/ppp_defs.h')
| -rw-r--r-- | include/linux/ppp_defs.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/ppp_defs.h b/include/linux/ppp_defs.h index 9d2b388fae1a..b7e57fdbd413 100644 --- a/include/linux/ppp_defs.h +++ b/include/linux/ppp_defs.h @@ -11,4 +11,18 @@ #include <uapi/linux/ppp_defs.h> #define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c) + +/** + * ppp_proto_is_valid - checks if PPP protocol is valid + * @proto: PPP protocol + * + * Assumes proto is not compressed. + * Protocol is valid if the value is odd and the least significant bit of the + * most significant octet is 0 (see RFC 1661, section 2). + */ +static inline bool ppp_proto_is_valid(u16 proto) +{ + return !!((proto & 0x0101) == 0x0001); +} + #endif /* _PPP_DEFS_H_ */ |