diff options
Diffstat (limited to 'sys/netinet/in.h')
| -rw-r--r-- | sys/netinet/in.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sys/netinet/in.h b/sys/netinet/in.h index e83d94b..4f47658 100644 --- a/sys/netinet/in.h +++ b/sys/netinet/in.h @@ -734,6 +734,32 @@ void in_ifdetach(struct ifnet *); #define sintosa(sin) ((struct sockaddr *)(sin)) #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) +/* + * Historically, BSD keeps ip_len and ip_off in host format + * when doing layer 3 processing, and this often requires + * to translate the format back and forth. + * To make the process explicit, we define a couple of macros + * that also take into account the fact that at some point + * we may want to keep those fields always in net format. + */ + +#if (BYTE_ORDER == BIG_ENDIAN) || defined(HAVE_NET_IPLEN) +#define SET_NET_IPLEN(p) do {} while (0) +#define SET_HOST_IPLEN(p) do {} while (0) +#else +#define SET_NET_IPLEN(p) do { \ + struct ip *h_ip = (p); \ + h_ip->ip_len = htons(h_ip->ip_len); \ + h_ip->ip_off = htons(h_ip->ip_off); \ + } while (0) + +#define SET_HOST_IPLEN(p) do { \ + struct ip *h_ip = (p); \ + h_ip->ip_len = ntohs(h_ip->ip_len); \ + h_ip->ip_off = ntohs(h_ip->ip_off); \ + } while (0) +#endif /* !HAVE_NET_IPLEN */ + #endif /* _KERNEL */ /* INET6 stuff */ |
