Rename IP header related things to IP_UDP. The existing definition of IP_t includes UDP header, so name it to accurately describe the structure. Also add a structure that only contains IP header fields to be used by functions that don't need UDP.
Signed-off-by: Joe Hershberger joe.hershberger@ni.com Cc: Joe Hershberger joe.hershberger@gmail.com Cc: Simon Glass sjg@chromium.org Cc: Mike Frysinger vapier@gentoo.org --- Changes for v2: - Split apart from "Un-typedef variables in net" - Created a new IP_UDP_hdr struct and removed UDP members from IP_hdr - Renamed structs from *_t to *_hdr since they are nolonger types
drivers/net/netconsole.c | 4 +- include/net.h | 33 +++++++++++++++----- net/arp.c | 2 +- net/arp.h | 2 +- net/bootp.c | 6 ++-- net/bootp.h | 2 +- net/dns.c | 2 +- net/net.c | 78 +++++++++++++++++++++++---------------------- net/nfs.c | 2 +- net/ping.c | 16 +++++----- net/ping.h | 2 +- net/rarp.c | 2 +- net/rarp.h | 2 +- net/sntp.c | 2 +- net/tftp.c | 2 +- 15 files changed, 88 insertions(+), 69 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 7acd5b0..ba02fd7 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -69,7 +69,7 @@ void NcStart(void) /* send arp request */ uchar *pkt; NetSetHandler(nc_wait_arp_handler); - pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE; + pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE; memcpy(pkt, output_packet, output_packet_len); NetSendUDPPacket(nc_ether, nc_ip, nc_port, nc_port, output_packet_len); @@ -131,7 +131,7 @@ static void nc_send_packet(const char *buf, int len) return; inited = 1; } - pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE; + pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE; memcpy(pkt, buf, len); ether = nc_ether; ip = nc_ip; diff --git a/include/net.h b/include/net.h index 7fc0b60..e9b398a 100644 --- a/include/net.h +++ b/include/net.h @@ -195,7 +195,7 @@ typedef struct { /* * Internet Protocol (IP) header. */ -typedef struct { +struct IP_hdr { uchar ip_hl_v; /* header length and version */ uchar ip_tos; /* type of service */ ushort ip_len; /* total length */ @@ -206,11 +206,7 @@ typedef struct { ushort ip_sum; /* checksum */ IPaddr_t ip_src; /* Source IP address */ IPaddr_t ip_dst; /* Destination IP address */ - ushort udp_src; /* UDP source port */ - ushort udp_dst; /* UDP destination port */ - ushort udp_len; /* Length of UDP packet */ - ushort udp_xsum; /* Checksum */ -} IP_t; +};
#define IP_OFFS 0x1fff /* ip offset *= 8 */ #define IP_FLAGS 0xe000 /* first 3 bits */ @@ -218,9 +214,30 @@ typedef struct { #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)) +#define IP_HDR_SIZE (sizeof(struct IP_hdr)) + +/* + * Internet Protocol (IP) + UDP header. + */ +struct IP_UDP_hdr { + uchar ip_hl_v; /* header length and version */ + uchar ip_tos; /* type of service */ + ushort ip_len; /* total length */ + ushort ip_id; /* identification */ + ushort ip_off; /* fragment offset field */ + uchar ip_ttl; /* time to live */ + uchar ip_p; /* protocol */ + ushort ip_sum; /* checksum */ + IPaddr_t ip_src; /* Source IP address */ + IPaddr_t ip_dst; /* Destination IP address */ + ushort udp_src; /* UDP source port */ + ushort udp_dst; /* UDP destination port */ + ushort udp_len; /* Length of UDP packet */ + ushort udp_xsum; /* Checksum */ +};
+#define IP_UDP_HDR_SIZE (sizeof(struct IP_UDP_hdr)) +#define UDP_HDR_SIZE (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
/* * Address Resolution Protocol (ARP) header. diff --git a/net/arp.c b/net/arp.c index f75217c..d918810 100644 --- a/net/arp.c +++ b/net/arp.c @@ -113,7 +113,7 @@ void ArpTimeoutCheck(void) } }
-void ArpReceive(Ethernet_t *et, IP_t *ip, int len) +void ArpReceive(Ethernet_t *et, struct IP_UDP_hdr *ip, int len) { ARP_t *arp; IPaddr_t tmp; diff --git a/net/arp.h b/net/arp.h index 4016a90..3c27348 100644 --- a/net/arp.h +++ b/net/arp.h @@ -25,6 +25,6 @@ extern int NetArpWaitTry; void ArpInit(void); void ArpRequest(void); void ArpTimeoutCheck(void); -void ArpReceive(Ethernet_t *et, IP_t *ip, int len); +void ArpReceive(Ethernet_t *et, struct IP_UDP_hdr *ip, int len);
#endif /* __ARP_H__ */ diff --git a/net/bootp.c b/net/bootp.c index 5949e77..f5f9119 100644 --- a/net/bootp.c +++ b/net/bootp.c @@ -623,8 +623,8 @@ BootpRequest(void) */ /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (struct Bootp_t)); */ - iphdr = pkt; /* We need this later for NetSetIP() */ - pkt += IP_HDR_SIZE; + iphdr = pkt; /* We need this later for NetSetUDPHeader() */ + pkt += IP_UDP_HDR_SIZE;
bp = (struct Bootp_t *)pkt; bp->bp_op = OP_BOOTREQUEST; @@ -809,7 +809,7 @@ static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
iphdr = pkt; /* We'll need this later to set proper pkt size */ - pkt += IP_HDR_SIZE; + pkt += IP_UDP_HDR_SIZE;
bp = (struct Bootp_t *)pkt; bp->bp_op = OP_BOOTREQUEST; diff --git a/net/bootp.h b/net/bootp.h index bf4e875..1cf9a02 100644 --- a/net/bootp.h +++ b/net/bootp.h @@ -52,7 +52,7 @@ struct Bootp_t { };
#define BOOTP_HDR_SIZE sizeof(struct Bootp_t) -#define BOOTP_SIZE (ETHER_HDR_SIZE + IP_HDR_SIZE + BOOTP_HDR_SIZE) +#define BOOTP_SIZE (ETHER_HDR_SIZE + IP_UDP_HDR_SIZE + BOOTP_HDR_SIZE)
/**********************************************************************/ /* diff --git a/net/dns.c b/net/dns.c index 7a3f1f9..cc7ed51 100644 --- a/net/dns.c +++ b/net/dns.c @@ -45,7 +45,7 @@ DnsSend(void) enum dns_query_type qtype = DNS_A_RECORD;
name = NetDNSResolve; - pkt = p = (uchar *)(NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE); + pkt = p = (uchar *)(NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE);
/* Prepare DNS packet header */ header = (struct header *) pkt; diff --git a/net/net.c b/net/net.c index a812298..35ead0e 100644 --- a/net/net.c +++ b/net/net.c @@ -621,12 +621,13 @@ NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
NetSetIP(pkt, dest, dport, sport, len); - memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + - (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); + memcpy(pkt + IP_UDP_HDR_SIZE, (uchar *)NetTxPacket + + (pkt - (uchar *)NetArpWaitTxPacket) + + IP_UDP_HDR_SIZE, len);
/* size of the waiting packet */ NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + - IP_HDR_SIZE + len; + IP_UDP_HDR_SIZE + len;
/* and do the ARP request */ NetArpWaitTry = 1; @@ -640,7 +641,7 @@ NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) pkt = (uchar *)NetTxPacket; pkt += NetSetEther(pkt, ether, PROT_IP); NetSetIP(pkt, dest, dport, sport, len); - (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); + eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_UDP_HDR_SIZE + len);
return 0; /* transmitted */ } @@ -664,7 +665,7 @@ NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) static struct rpc_t rpc_specimen; #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
-#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) +#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
/* * this is the packet being assembled, either data or frag control. @@ -678,22 +679,22 @@ struct hole { u16 unused; };
-static IP_t *__NetDefragment(IP_t *ip, int *lenp) +static struct IP_UDP_hdr *__NetDefragment(struct IP_UDP_hdr *ip, int *lenp) { static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); static u16 first_hole, total_len; struct hole *payload, *thisfrag, *h, *newh; - IP_t *localip = (IP_t *)pkt_buff; + struct IP_UDP_hdr *localip = (struct IP_UDP_hdr *)pkt_buff; uchar *indata = (uchar *)ip; int offset8, start, len, done = 0; u16 ip_off = ntohs(ip->ip_off);
/* payload starts after IP header, this fragment is in there */ - payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); + payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); offset8 = (ip_off & IP_OFFS); thisfrag = payload + offset8; start = offset8 * 8; - len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; + len = ntohs(ip->ip_len) - IP_HDR_SIZE;
if (start + len > IP_MAXUDP) /* fragment extends too far */ return NULL; @@ -706,7 +707,7 @@ static IP_t *__NetDefragment(IP_t *ip, int *lenp) payload[0].prev_hole = 0; first_hole = 0; /* any IP header will work, copy the first we received */ - memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); + memcpy(localip, ip, IP_HDR_SIZE); }
/* @@ -789,16 +790,16 @@ static IP_t *__NetDefragment(IP_t *ip, int *lenp) }
/* finally copy this fragment and possibly return whole packet */ - memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); + memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); if (!done) return NULL;
localip->ip_len = htons(total_len); - *lenp = total_len + IP_HDR_SIZE_NO_UDP; + *lenp = total_len + IP_HDR_SIZE; return localip; }
-static inline IP_t *NetDefragment(IP_t *ip, int *lenp) +static inline struct IP_UDP_hdr *NetDefragment(struct IP_UDP_hdr *ip, int *lenp) { u16 ip_off = ntohs(ip->ip_off); if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) @@ -808,7 +809,7 @@ static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
#else /* !CONFIG_IP_DEFRAG */
-static inline IP_t *NetDefragment(IP_t *ip, int *lenp) +static inline struct IP_UDP_hdr *NetDefragment(struct IP_UDP_hdr *ip, int *lenp) { u16 ip_off = ntohs(ip->ip_off); if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) @@ -823,7 +824,8 @@ static inline IP_t *NetDefragment(IP_t *ip, int *lenp) * * @parma ip IP packet containing the ICMP */ -static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) +static void receive_icmp(struct IP_UDP_hdr *ip, int len, + IPaddr_t src_ip, Ethernet_t *et) { ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
@@ -852,7 +854,7 @@ void NetReceive(uchar *inpkt, int len) { Ethernet_t *et; - IP_t *ip; + struct IP_UDP_hdr *ip; IPaddr_t tmp; IPaddr_t src_ip; int x; @@ -900,11 +902,11 @@ NetReceive(uchar *inpkt, int len) */ x = ntohs(et->et_prot);
- ip = (IP_t *)(inpkt + E802_HDR_SIZE); + ip = (struct IP_UDP_hdr *)(inpkt + E802_HDR_SIZE); len -= E802_HDR_SIZE;
} else if (x != PROT_VLAN) { /* normal packet */ - ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); + ip = (struct IP_UDP_hdr *)(inpkt + ETHER_HDR_SIZE); len -= ETHER_HDR_SIZE;
} else { /* VLAN packet */ @@ -928,7 +930,7 @@ NetReceive(uchar *inpkt, int len) vlanid = cti & VLAN_IDMASK; x = ntohs(vet->vet_type);
- ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); + ip = (struct IP_UDP_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE); len -= VLAN_ETHER_HDR_SIZE; }
@@ -963,8 +965,9 @@ NetReceive(uchar *inpkt, int len) case PROT_IP: debug("Got IP\n"); /* Before we start poking the header, make sure it is there */ - if (len < IP_HDR_SIZE) { - debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); + if (len < IP_UDP_HDR_SIZE) { + debug("len bad %d < %lu\n", len, + (ulong)IP_UDP_HDR_SIZE); return; } /* Check the packet length */ @@ -982,7 +985,7 @@ NetReceive(uchar *inpkt, int len) if ((ip->ip_hl_v & 0x0f) > 0x05) return; /* Check the Checksum of the header */ - if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { + if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) { puts("checksum bad\n"); return; } @@ -1076,19 +1079,19 @@ NetReceive(uchar *inpkt, int len)
#ifdef CONFIG_NETCONSOLE - nc_input_packet((uchar *)ip + IP_HDR_SIZE, - ntohs(ip->udp_dst), - ntohs(ip->udp_src), - ntohs(ip->udp_len) - 8); + nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, + ntohs(ip->udp_dst), + ntohs(ip->udp_src), + ntohs(ip->udp_len) - UDP_HDR_SIZE); #endif /* * IP header OK. Pass the packet to the current handler. */ - (*packetHandler)((uchar *)ip + IP_HDR_SIZE, - ntohs(ip->udp_dst), - src_ip, - ntohs(ip->udp_src), - ntohs(ip->udp_len) - 8); + (*packetHandler)((uchar *)ip + IP_UDP_HDR_SIZE, + ntohs(ip->udp_dst), + src_ip, + ntohs(ip->udp_src), + ntohs(ip->udp_len) - UDP_HDR_SIZE); break; } } @@ -1239,10 +1242,9 @@ NetSetEther(uchar *xet, uchar * addr, uint prot) } }
-void -NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) +void NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) { - IP_t *ip = (IP_t *)xip; + struct IP_UDP_hdr *ip = (struct IP_UDP_hdr *)xip;
/* * If the data is an odd number of bytes, zero the @@ -1250,7 +1252,7 @@ NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) * will work. */ if (len & 1) - xip[IP_HDR_SIZE + len] = 0; + xip[IP_UDP_HDR_SIZE + len] = 0;
/* * Construct an IP and UDP header. @@ -1259,7 +1261,7 @@ NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) /* IP_HDR_SIZE / 4 (not including UDP) */ ip->ip_hl_v = 0x45; ip->ip_tos = 0; - ip->ip_len = htons(IP_HDR_SIZE + len); + ip->ip_len = htons(IP_UDP_HDR_SIZE + len); ip->ip_id = htons(NetIPID++); ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ ip->ip_ttl = 255; @@ -1271,9 +1273,9 @@ NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) NetCopyIP((void *)&ip->ip_dst, &dest); ip->udp_src = htons(sport); ip->udp_dst = htons(dport); - ip->udp_len = htons(8 + len); + ip->udp_len = htons(UDP_HDR_SIZE + len); ip->udp_xsum = 0; - ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); + ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE / 2); }
void copy_filename(char *dst, const char *src, int size) diff --git a/net/nfs.c b/net/nfs.c index 54f56c4..b6188fe 100644 --- a/net/nfs.c +++ b/net/nfs.c @@ -189,7 +189,7 @@ rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
- memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, + memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE, (char *)&pkt, pktlen);
if (rpc_prog == PROG_PORTMAP) diff --git a/net/ping.c b/net/ping.c index 0e5b1da..fe4cead 100644 --- a/net/ping.c +++ b/net/ping.c @@ -19,7 +19,7 @@ IPaddr_t NetPingIP; static int ping_send(void) { static uchar mac[6]; - IP_t *ip; + struct IP_UDP_hdr *ip; ushort *s; uchar *pkt;
@@ -35,7 +35,7 @@ static int ping_send(void) pkt = NetArpWaitTxPacket; pkt += NetSetEther(pkt, mac, PROT_IP);
- ip = (IP_t *)pkt; + ip = (struct IP_UDP_hdr *)pkt;
/* * Construct an IP and ICMP header. @@ -44,7 +44,7 @@ static int ping_send(void) /* IP_HDR_SIZE / 4 (not including UDP) */ ip->ip_hl_v = 0x45; ip->ip_tos = 0; - ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); + ip->ip_len = htons(IP_HDR_SIZE + 8); ip->ip_id = htons(NetIPID++); ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ ip->ip_ttl = 255; @@ -54,7 +54,7 @@ static int ping_send(void) NetCopyIP((void *)&ip->ip_src, &NetOurIP); /* - "" - */ NetCopyIP((void *)&ip->ip_dst, &NetPingIP); - ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); + ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE / 2);
s = &ip->udp_src; /* XXX ICMP starts here */ s[0] = htons(0x0800); /* echo-request, code */ @@ -65,7 +65,7 @@ static int ping_send(void)
/* size of the waiting packet */ NetArpWaitTxPacketSize = - (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; + (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + 8;
/* and do the ARP request */ NetArpWaitTry = 1; @@ -98,7 +98,7 @@ void ping_start(void) ping_send(); }
-void ping_receive(Ethernet_t *et, IP_t *ip, int len) +void ping_receive(Ethernet_t *et, struct IP_UDP_hdr *ip, int len) { ICMP_t *icmph = (ICMP_t *)&(ip->udp_src); IPaddr_t src_ip; @@ -125,12 +125,12 @@ void ping_receive(Ethernet_t *et, IP_t *ip, int len) NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); NetCopyIP((void *)&ip->ip_src, &NetOurIP); ip->ip_sum = ~NetCksum((uchar *)ip, - IP_HDR_SIZE_NO_UDP >> 1); + IP_HDR_SIZE >> 1);
icmph->type = ICMP_ECHO_REPLY; icmph->checksum = 0; icmph->checksum = ~NetCksum((uchar *)icmph, - (len - IP_HDR_SIZE_NO_UDP) >> 1); + (len - IP_HDR_SIZE) >> 1); (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len); return; diff --git a/net/ping.h b/net/ping.h index 94d434e..dd97b58 100644 --- a/net/ping.h +++ b/net/ping.h @@ -17,7 +17,7 @@ #include <net.h>
void ping_start(void); -void ping_receive(Ethernet_t *et, IP_t *ip, int len); +void ping_receive(Ethernet_t *et, struct IP_UDP_hdr *ip, int len);
#endif /* __PING_H__ */ #endif diff --git a/net/rarp.c b/net/rarp.c index 9864468..b30c812 100644 --- a/net/rarp.c +++ b/net/rarp.c @@ -41,7 +41,7 @@ int RarpTry; /* * Handle a RARP received packet. */ -void rarp_receive(IP_t *ip, unsigned len) +void rarp_receive(struct IP_UDP_hdr *ip, unsigned len) { ARP_t *arp;
diff --git a/net/rarp.h b/net/rarp.h index e5a6c39..ac58881 100644 --- a/net/rarp.h +++ b/net/rarp.h @@ -35,7 +35,7 @@
extern int RarpTry;
-extern void rarp_receive(IP_t *ip, unsigned len); +extern void rarp_receive(struct IP_UDP_hdr *ip, unsigned len); extern void RarpRequest(void); /* Send a RARP request */
/**********************************************************************/ diff --git a/net/sntp.c b/net/sntp.c index 6dd0dbd..7997f98 100644 --- a/net/sntp.c +++ b/net/sntp.c @@ -31,7 +31,7 @@ SntpSend(void) pkt.vn = NTP_VERSION; pkt.mode = NTP_MODE_CLIENT;
- memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, + memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE, (char *)&pkt, pktlen);
SntpOurPort = 10000 + (get_timer(0) % 4096); diff --git a/net/tftp.c b/net/tftp.c index bc7fe05..a04a832 100644 --- a/net/tftp.c +++ b/net/tftp.c @@ -322,7 +322,7 @@ TftpSend(void) * We will always be sending some sort of packet, so * cobble together the packet headers now. */ - pkt = (uchar *)(NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE); + pkt = NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
switch (TftpState) { case STATE_SEND_RRQ: