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authorJoe Hershberger <joe.hershberger@ni.com>2012-05-23 07:59:07 +0000
committerJoe Hershberger <joe.hershberger@ni.com>2012-05-23 17:46:18 -0500
commit4b11c9166b86ccc5f8f02fda01ded0f9e9760df0 (patch)
treecdf2b9de655df32a3937ea6a22395d67b21c469a /net/ping.c
parent674bb249825aa9b0bddab046d23d43c33bb75f78 (diff)
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net: Refactor IP, UPD, and ICMP header writing functions
ICMP (ping) was reimplementing IP header code... it now shares code. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> Acked-by: Simon Glass <sjg@chromium.org> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'net/ping.c')
-rw-r--r--net/ping.c52
1 files changed, 23 insertions, 29 deletions
diff --git a/net/ping.c b/net/ping.c
index 3102521..c525635 100644
--- a/net/ping.c
+++ b/net/ping.c
@@ -16,11 +16,31 @@ static ushort PingSeqNo;
/* The ip address to ping */
IPaddr_t NetPingIP;
+static void set_icmp_header(uchar *pkt, IPaddr_t dest)
+{
+ /*
+ * Construct an IP and ICMP header.
+ */
+ struct ip_hdr *ip = (struct ip_hdr *)pkt;
+ struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
+
+ net_set_ip_header(pkt, dest, NetOurIP);
+
+ ip->ip_len = htons(IP_ICMP_HDR_SIZE);
+ ip->ip_p = IPPROTO_ICMP;
+ ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
+
+ icmp->type = ICMP_ECHO_REQUEST;
+ icmp->code = 0;
+ icmp->checksum = 0;
+ icmp->un.echo.id = 0;
+ icmp->un.echo.sequence = htons(PingSeqNo++);
+ icmp->checksum = ~NetCksum((uchar *)icmp, ICMP_HDR_SIZE >> 1);
+}
+
static int ping_send(void)
{
static uchar mac[6];
- struct ip_udp_hdr *ip;
- ushort *s;
uchar *pkt;
/* XXX always send arp request */
@@ -35,33 +55,7 @@ static int ping_send(void)
pkt = NetArpWaitTxPacket;
pkt += NetSetEther(pkt, mac, PROT_IP);
- ip = (struct ip_udp_hdr *)pkt;
-
- /*
- * Construct an IP and ICMP header.
- * (need to set no fragment bit - XXX)
- */
- /* IP_HDR_SIZE / 4 (not including UDP) */
- ip->ip_hl_v = 0x45;
- ip->ip_tos = 0;
- 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;
- ip->ip_p = 0x01; /* ICMP */
- ip->ip_sum = 0;
- /* already in network byte order */
- NetCopyIP((void *)&ip->ip_src, &NetOurIP);
- /* - "" - */
- NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
- 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 */
- s[1] = 0; /* checksum */
- s[2] = 0; /* identifier */
- s[3] = htons(PingSeqNo++); /* sequence number */
- s[1] = ~NetCksum((uchar *)s, 8/2);
+ set_icmp_header(pkt, NetPingIP);
/* size of the waiting packet */
NetArpWaitTxPacketSize =
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