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| author | Baruch Siach | 2011-09-07 17:52:37 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2011-09-07 17:55:40 +0200 |
| commit | e8f36330d9bb27f9f7e66aa6f01ff92c07d86f62 (patch) | |
| tree | 863018163a166cc690902d8027a3f04f9f812dd3 /networking/ping.c | |
| parent | 8c84f7545cf08925edb23d94d9f6519b338267c6 (diff) | |
| download | busybox-e8f36330d9bb27f9f7e66aa6f01ff92c07d86f62.zip busybox-e8f36330d9bb27f9f7e66aa6f01ff92c07d86f62.tar.gz | |
networking: consolidate the IP checksum code. -129 bytes.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/ping.c')
| -rw-r--r-- | networking/ping.c | 31 |
1 files changed, 3 insertions, 28 deletions
diff --git a/networking/ping.c b/networking/ping.c index efd4f21..a1fd9df 100644 --- a/networking/ping.c +++ b/networking/ping.c @@ -149,31 +149,6 @@ enum { PINGINTERVAL = 1, /* 1 second */ }; -/* Common routines */ - -static int in_cksum(unsigned short *buf, int sz) -{ - int nleft = sz; - int sum = 0; - unsigned short *w = buf; - unsigned short ans = 0; - - while (nleft > 1) { - sum += *w++; - nleft -= 2; - } - - if (nleft == 1) { - *(unsigned char *) (&ans) = *(unsigned char *) w; - sum += ans; - } - - sum = (sum >> 16) + (sum & 0xFFFF); - sum += (sum >> 16); - ans = ~sum; - return ans; -} - #if !ENABLE_FEATURE_FANCY_PING /* Simple version */ @@ -201,7 +176,7 @@ static void ping4(len_and_sockaddr *lsa) pkt = (struct icmp *) G.packet; memset(pkt, 0, sizeof(G.packet)); pkt->icmp_type = ICMP_ECHO; - pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(G.packet)); + pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet)); xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len); @@ -493,7 +468,7 @@ static void sendping4(int junk UNUSED_PARAM) /* No hton: we'll read it back on the same machine */ *(uint32_t*)&pkt->icmp_dun = monotonic_us(); - pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN); + pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN); sendping_tail(sendping4, ICMP_MINLEN); } @@ -512,7 +487,7 @@ static void sendping6(int junk UNUSED_PARAM) /*if (datalen >= 4)*/ *(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us(); - //TODO? pkt->icmp_cksum = in_cksum(...); + //TODO? pkt->icmp_cksum = inet_cksum(...); sendping_tail(sendping6, sizeof(struct icmp6_hdr)); } |