package/network/services/ppp/patches/105-debian_demand.patch

   1 --- a/pppd/demand.c
   2 +++ b/pppd/demand.c
   3 @@ -36,6 +36,8 @@
   4  #include <errno.h>
   5  #include <fcntl.h>
   6  #include <netdb.h>
   7 +#include <unistd.h>
   8 +#include <syslog.h>
   9  #include <sys/param.h>
  10  #include <sys/types.h>
  11  #include <sys/wait.h>
  12 @@ -43,6 +45,8 @@
  13  #include <sys/resource.h>
  14  #include <sys/stat.h>
  15  #include <sys/socket.h>
  16 +#include <netinet/in.h>
  17 +#include <arpa/inet.h>
  18  #ifdef PPP_FILTER
  19  #include <pcap-bpf.h>
  20  #endif
  21 @@ -221,6 +225,14 @@ loop_chars(p, n)
  22      int c, rv;
  23
  24      rv = 0;
  25 +
  26 +/* check for synchronous connection... */
  27 +
  28 +    if ( (p[0] == 0xFF) && (p[1] == 0x03) ) {
  29 +        rv = loop_frame(p,n);
  30 +        return rv;
  31 +    }
  32 +
  33      for (; n > 0; --n) {
  34         c = *p++;
  35         if (c == PPP_FLAG) {
  36 @@ -299,17 +311,102 @@ loop_frame(frame, len)
  37   * loopback, now that the real serial link is up.
  38   */
  39  void
  40 -demand_rexmit(proto)
  41 +demand_rexmit(proto, newip)
  42      int proto;
  43 +    u_int32_t newip;
  44  {
  45      struct packet *pkt, *prev, *nextpkt;
  46 +    unsigned short checksum;
  47 +    unsigned short pkt_checksum = 0;
  48 +    unsigned iphdr;
  49 +    struct timeval tv;
  50 +    char cv = 0;
  51 +    char ipstr[16];
  52
  53      prev = NULL;
  54      pkt = pend_q;
  55      pend_q = NULL;
  56 +    tv.tv_sec = 1;
  57 +    tv.tv_usec = 0;
  58 +    select(0,NULL,NULL,NULL,&tv);      /* Sleep for 1 Seconds */
  59      for (; pkt != NULL; pkt = nextpkt) {
  60         nextpkt = pkt->next;
  61         if (PPP_PROTOCOL(pkt->data) == proto) {
  62 +            if ( (proto == PPP_IP) && newip ) {
  63 +               /* Get old checksum */
  64 +
  65 +               iphdr = (pkt->data[4] & 15) << 2;
  66 +               checksum = *((unsigned short *) (pkt->data+14));
  67 +                if (checksum == 0xFFFF) {
  68 +                    checksum = 0;
  69 +                }
  70 +
  71 +
  72 +                if (pkt->data[13] == 17) {
  73 +                    pkt_checksum =  *((unsigned short *) (pkt->data+10+iphdr));
  74 +                   if (pkt_checksum) {
  75 +                        cv = 1;
  76 +                        if (pkt_checksum == 0xFFFF) {
  77 +                            pkt_checksum = 0;
  78 +                        }
  79 +                    }
  80 +                    else {
  81 +                       cv = 0;
  82 +                    }
  83 +                }
  84 +
  85 +               if (pkt->data[13] == 6) {
  86 +                   pkt_checksum = *((unsigned short *) (pkt->data+20+iphdr));
  87 +                   cv = 1;
  88 +                    if (pkt_checksum == 0xFFFF) {
  89 +                        pkt_checksum = 0;
  90 +                    }
  91 +               }
  92 +
  93 +               /* Delete old Source-IP-Address */
  94 +                checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
  95 +                checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
  96 +
  97 +               pkt_checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
  98 +               pkt_checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
  99 +
 100 +               /* Change Source-IP-Address */
 101 +                * ((u_int32_t *) (pkt->data + 16)) = newip;
 102 +
 103 +               /* Add new Source-IP-Address */
 104 +                checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
 105 +                checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
 106 +
 107 +                pkt_checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
 108 +                pkt_checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
 109 +
 110 +               /* Write new checksum */
 111 +                if (!checksum) {
 112 +                    checksum = 0xFFFF;
 113 +                }
 114 +                *((unsigned short *) (pkt->data+14)) = checksum;
 115 +               if (pkt->data[13] == 6) {
 116 +                   *((unsigned short *) (pkt->data+20+iphdr)) = pkt_checksum;
 117 +               }
 118 +               if (cv && (pkt->data[13] == 17) ) {
 119 +                   *((unsigned short *) (pkt->data+10+iphdr)) = pkt_checksum;
 120 +               }
 121 +
 122 +               /* Log Packet */
 123 +               strcpy(ipstr,inet_ntoa(*( (struct in_addr *) (pkt->data+16))));
 124 +               if (pkt->data[13] == 1) {
 125 +                   syslog(LOG_INFO,"Open ICMP %s -> %s\n",
 126 +                       ipstr,
 127 +                       inet_ntoa(*( (struct in_addr *) (pkt->data+20))));
 128 +               } else {
 129 +                   syslog(LOG_INFO,"Open %s %s:%d -> %s:%d\n",
 130 +                       pkt->data[13] == 6 ? "TCP" : "UDP",
 131 +                       ipstr,
 132 +                       ntohs(*( (short *) (pkt->data+iphdr+4))),
 133 +                       inet_ntoa(*( (struct in_addr *) (pkt->data+20))),
 134 +                       ntohs(*( (short *) (pkt->data+iphdr+6))));
 135 +                }
 136 +            }
 137             output(0, pkt->data, pkt->length);
 138             free(pkt);
 139         } else {
 140 --- a/pppd/ipcp.c
 141 +++ b/pppd/ipcp.c
 142 @@ -1864,7 +1864,7 @@ ipcp_up(f)
 143                     proxy_arp_set[f->unit] = 1;
 144
 145         }
 146 -       demand_rexmit(PPP_IP);
 147 +       demand_rexmit(PPP_IP,go->ouraddr);
 148         sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
 149
 150      } else {
 151 --- a/pppd/ipv6cp.c
 152 +++ b/pppd/ipv6cp.c
 153 @@ -1232,7 +1232,7 @@ ipv6cp_up(f)
 154             }
 155
 156         }
 157 -       demand_rexmit(PPP_IPV6);
 158 +       demand_rexmit(PPP_IPV6,0);
 159         sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
 160
 161      } else {
 162 --- a/pppd/pppd.h
 163 +++ b/pppd/pppd.h
 164 @@ -566,7 +566,7 @@ void demand_conf __P((void));       /* config
 165  void demand_block __P((void)); /* set all NPs to queue up packets */
 166  void demand_unblock __P((void)); /* set all NPs to pass packets */
 167  void demand_discard __P((void)); /* set all NPs to discard packets */
 168 -void demand_rexmit __P((int)); /* retransmit saved frames for an NP */
 169 +void demand_rexmit __P((int, u_int32_t)); /* retransmit saved frames for an NP*/
 170  int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
 171  int  loop_frame __P((unsigned char *, int)); /* should we bring link up? */
 172