throttle outgoing LASTSEEN packets to at most one per second for a given seq#

[l2tpns.git] / icmp.c

diff --git a/icmp.c b/icmp.c
index f7d73c6..c163a69 100644 (file)
--- a/icmp.c
+++ b/icmp.c
@@ -1,3 +1,7 @@
+// L2TPNS: icmp
+
+char const *cvs_id_icmp = "$Id: icmp.c,v 1.6 2004/12/16 08:49:53 bodea Exp $";
+
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <netinet/in.h>
@@ -13,9 +17,9 @@
 
 #include "l2tpns.h"
 
-__u16 _checksum(unsigned char *addr, int count);
+static uint16_t _checksum(unsigned char *addr, int count);
 
-void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len)
+void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len)
 {
        char buf[128] = {0};
        struct iphdr *iph;
@@ -24,8 +28,9 @@ void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int pac
        int len = 0, on = 1, icmp_socket;
        struct sockaddr_in whereto = {0};
 
-       if (!(icmp_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)))
+       if ((icmp_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
                return;
+
        setsockopt(icmp_socket, IPPROTO_IP, IP_HDRINCL, (char *)&on, sizeof(on));
 
        whereto.sin_addr.s_addr = destination;
@@ -55,21 +60,21 @@ void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int pac
 
        icmp->type = ICMP_DEST_UNREACH;
        icmp->code = ICMP_HOST_UNREACH;
-       icmp->checksum = _checksum((char *)icmp, sizeof(struct icmphdr) + ((packet_len < 64) ? packet_len : 64));
+       icmp->checksum = _checksum((char *) icmp, sizeof(struct icmphdr) + ((packet_len < 64) ? packet_len : 64));
 
-       iph->check = _checksum((char *)iph, sizeof(struct iphdr));
+       iph->check = _checksum((char *) iph, sizeof(struct iphdr));
 
        sendto(icmp_socket, (char *)buf, len, 0, (struct sockaddr *)&whereto, sizeof(struct sockaddr));
        close(icmp_socket);
 }
 
-__u16 _checksum(unsigned char *addr, int count)
+static uint16_t _checksum(unsigned char *addr, int count)
 {
        register long sum = 0;
 
        for (; count > 1; count -= 2)
        {
-               sum += ntohs(*(u32 *)addr);
+               sum += ntohs(*(uint32_t *) addr);
                addr += 2;
        }
 
@@ -82,5 +87,5 @@ __u16 _checksum(unsigned char *addr, int count)
        // one's complement the result
        sum = ~sum;
 
-       return htons((u16) sum);
+       return htons((uint16_t) sum);
 }