diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/netinet/tcp_var.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h index 099904366a91..89a89cfb63c9 100644 --- a/sys/netinet/tcp_var.h +++ b/sys/netinet/tcp_var.h @@ -235,14 +235,17 @@ struct tcpcb { * to tcp_dooptions and tcp_addoptions. * The binary order of the to_flags is relevant for packing of the * options in tcp_addoptions. + * SACK should be kept after TS; some broken cable modem / router + * devices were found in the field that ignore SYN-ACKs with + * SACK before TS. */ struct tcpopt { u_long to_flags; /* which options are present */ #define TOF_MSS 0x0001 /* maximum segment size */ #define TOF_SCALE 0x0002 /* window scaling */ -#define TOF_SACKPERM 0x0004 /* SACK permitted */ #define TOF_TS 0x0010 /* timestamp */ -#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ +#define TOF_SIGNATURE 0x0020 /* TCP-MD5 signature option (RFC2385) */ +#define TOF_SACKPERM 0x0040 /* SACK permitted */ #define TOF_SACK 0x0080 /* Peer sent SACK option */ #define TOF_MAXOPT 0x0100 u_int32_t to_tsval; /* new timestamp */ |