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- --- a/pppd/demand.c
- +++ b/pppd/demand.c
- @@ -36,6 +36,8 @@
- #include <errno.h>
- #include <fcntl.h>
- #include <netdb.h>
- +#include <unistd.h>
- +#include <syslog.h>
- #include <sys/param.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- @@ -43,6 +45,8 @@
- #include <sys/resource.h>
- #include <sys/stat.h>
- #include <sys/socket.h>
- +#include <netinet/in.h>
- +#include <arpa/inet.h>
- #ifdef PPP_FILTER
- #include <pcap-bpf.h>
- #endif
- @@ -221,6 +225,14 @@ loop_chars(p, n)
- int c, rv;
-
- rv = 0;
- +
- +/* check for synchronous connection... */
- +
- + if ( (p[0] == 0xFF) && (p[1] == 0x03) ) {
- + rv = loop_frame(p,n);
- + return rv;
- + }
- +
- for (; n > 0; --n) {
- c = *p++;
- if (c == PPP_FLAG) {
- @@ -299,17 +311,102 @@ loop_frame(frame, len)
- * loopback, now that the real serial link is up.
- */
- void
- -demand_rexmit(proto)
- +demand_rexmit(proto, newip)
- int proto;
- + u_int32_t newip;
- {
- struct packet *pkt, *prev, *nextpkt;
- + unsigned short checksum;
- + unsigned short pkt_checksum = 0;
- + unsigned iphdr;
- + struct timeval tv;
- + char cv = 0;
- + char ipstr[16];
-
- prev = NULL;
- pkt = pend_q;
- pend_q = NULL;
- + tv.tv_sec = 1;
- + tv.tv_usec = 0;
- + select(0,NULL,NULL,NULL,&tv); /* Sleep for 1 Seconds */
- for (; pkt != NULL; pkt = nextpkt) {
- nextpkt = pkt->next;
- if (PPP_PROTOCOL(pkt->data) == proto) {
- + if ( (proto == PPP_IP) && newip ) {
- + /* Get old checksum */
- +
- + iphdr = (pkt->data[4] & 15) << 2;
- + checksum = *((unsigned short *) (pkt->data+14));
- + if (checksum == 0xFFFF) {
- + checksum = 0;
- + }
- +
- +
- + if (pkt->data[13] == 17) {
- + pkt_checksum = *((unsigned short *) (pkt->data+10+iphdr));
- + if (pkt_checksum) {
- + cv = 1;
- + if (pkt_checksum == 0xFFFF) {
- + pkt_checksum = 0;
- + }
- + }
- + else {
- + cv = 0;
- + }
- + }
- +
- + if (pkt->data[13] == 6) {
- + pkt_checksum = *((unsigned short *) (pkt->data+20+iphdr));
- + cv = 1;
- + if (pkt_checksum == 0xFFFF) {
- + pkt_checksum = 0;
- + }
- + }
- +
- + /* Delete old Source-IP-Address */
- + checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
- + checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
- +
- + pkt_checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
- + pkt_checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
- +
- + /* Change Source-IP-Address */
- + * ((u_int32_t *) (pkt->data + 16)) = newip;
- +
- + /* Add new Source-IP-Address */
- + checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
- + checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
- +
- + pkt_checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
- + pkt_checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
- +
- + /* Write new checksum */
- + if (!checksum) {
- + checksum = 0xFFFF;
- + }
- + *((unsigned short *) (pkt->data+14)) = checksum;
- + if (pkt->data[13] == 6) {
- + *((unsigned short *) (pkt->data+20+iphdr)) = pkt_checksum;
- + }
- + if (cv && (pkt->data[13] == 17) ) {
- + *((unsigned short *) (pkt->data+10+iphdr)) = pkt_checksum;
- + }
- +
- + /* Log Packet */
- + strcpy(ipstr,inet_ntoa(*( (struct in_addr *) (pkt->data+16))));
- + if (pkt->data[13] == 1) {
- + syslog(LOG_INFO,"Open ICMP %s -> %s\n",
- + ipstr,
- + inet_ntoa(*( (struct in_addr *) (pkt->data+20))));
- + } else {
- + syslog(LOG_INFO,"Open %s %s:%d -> %s:%d\n",
- + pkt->data[13] == 6 ? "TCP" : "UDP",
- + ipstr,
- + ntohs(*( (short *) (pkt->data+iphdr+4))),
- + inet_ntoa(*( (struct in_addr *) (pkt->data+20))),
- + ntohs(*( (short *) (pkt->data+iphdr+6))));
- + }
- + }
- output(0, pkt->data, pkt->length);
- free(pkt);
- } else {
- --- a/pppd/ipcp.c
- +++ b/pppd/ipcp.c
- @@ -1883,7 +1883,7 @@ ipcp_up(f)
- proxy_arp_set[f->unit] = 1;
-
- }
- - demand_rexmit(PPP_IP);
- + demand_rexmit(PPP_IP,go->ouraddr);
- sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
-
- } else {
- --- a/pppd/ipv6cp.c
- +++ b/pppd/ipv6cp.c
- @@ -1232,7 +1232,7 @@ ipv6cp_up(f)
- }
-
- }
- - demand_rexmit(PPP_IPV6);
- + demand_rexmit(PPP_IPV6,0);
- sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
-
- } else {
- --- a/pppd/pppd.h
- +++ b/pppd/pppd.h
- @@ -585,7 +585,7 @@ void demand_conf __P((void)); /* config
- void demand_block __P((void)); /* set all NPs to queue up packets */
- void demand_unblock __P((void)); /* set all NPs to pass packets */
- void demand_discard __P((void)); /* set all NPs to discard packets */
- -void demand_rexmit __P((int)); /* retransmit saved frames for an NP */
- +void demand_rexmit __P((int, u_int32_t)); /* retransmit saved frames for an NP*/
- int loop_chars __P((unsigned char *, int)); /* process chars from loopback */
- int loop_frame __P((unsigned char *, int)); /* should we bring link up? */
-
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