These defines were pulled from the "Add simple IP/UDP fragmentation support" patch from Frank Haverkamp haver@vnet.ibm.com. --- include/net.h | 6 ++++++ net/net.c | 6 +++--- 2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/include/net.h b/include/net.h index a5a256b..199872e 100644 --- a/include/net.h +++ b/include/net.h @@ -200,6 +200,12 @@ typedef struct { ushort udp_xsum; /* Checksum */ } IP_t;
+#define IP_OFFS 0x1fff /* ip offset *= 8 */ +#define IP_FLAGS 0xe000 /* first 3 bits */ +#define IP_FLAGS_RES 0x8000 /* reserved */ +#define IP_FLAGS_DFRAG 0x4000 /* don't fragments */ +#define IP_FLAGS_MFRAG 0x2000 /* more fragments */ + #define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8) #define IP_HDR_SIZE (sizeof (IP_t))
diff --git a/net/net.c b/net/net.c index 77e83b5..cf1f4fa 100644 --- a/net/net.c +++ b/net/net.c @@ -735,7 +735,7 @@ int PingSend(void) ip->ip_tos = 0; ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); ip->ip_id = htons(NetIPID++); - ip->ip_off = htons(0x4000); /* No fragmentation */ + ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ ip->ip_ttl = 255; ip->ip_p = 0x01; /* ICMP */ ip->ip_sum = 0; @@ -1399,7 +1399,7 @@ NetReceive(volatile uchar * inpkt, int len) if ((ip->ip_hl_v & 0xf0) != 0x40) { return; } - if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */ + if (ip->ip_off & htons(IP_OFFS)) { /* Can't deal w/ fragments */ return; } /* can't deal with headers > 20 bytes */ @@ -1698,7 +1698,7 @@ NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len) ip->ip_tos = 0; ip->ip_len = htons(IP_HDR_SIZE + len); ip->ip_id = htons(NetIPID++); - ip->ip_off = htons(0x4000); /* No fragmentation */ + ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ ip->ip_ttl = 255; ip->ip_p = 17; /* UDP */ ip->ip_sum = 0;