diff options
Diffstat (limited to 'sys/netinet/ip_icmp.h')
| -rw-r--r-- | sys/netinet/ip_icmp.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/netinet/ip_icmp.h b/sys/netinet/ip_icmp.h index 38d44d78617d..a04643294ae2 100644 --- a/sys/netinet/ip_icmp.h +++ b/sys/netinet/ip_icmp.h @@ -136,6 +136,13 @@ struct icmp { #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) /* N.B.: must separately check that ip_hl >= 5 */ + /* This is the minimum length required by RFC 792. */ +/* + * ICMP_ADVLENPREF is the preferred number of bytes which should be contiguous. + * SCTP needs additional 12 bytes to be able to access the initiate tag + * in packets containing an INIT chunk. + */ +#define ICMP_ADVLENPREF(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8 + 12) /* * Definition of type and code field values. |