--- ppp-2.4.5/pppd/options.c
+++ ppp-2.4.5/pppd/options.c
@@ -100,6 +100,9 @@
char user[MAXNAMELEN]; /* Username for PAP */
char passwd[MAXSECRETLEN]; /* Password for PAP */
bool persist = 0; /* Reopen link after it goes down */
+bool killoldaddr = 0; /* If our IP is reassigned on
+ reconnect, kill active TCP
+ connections using the old IP. */
char our_name[MAXNAMELEN]; /* Our name for authentication purposes */
bool demand = 0; /* do dial-on-demand */
char *ipparam = NULL; /* Extra parameter for ip up/down scripts */
@@ -231,6 +234,11 @@
{ "demand", o_bool, &demand,
"Dial on demand", OPT_INITONLY | 1, &persist },
+ { "killoldaddr", o_bool, &killoldaddr,
+ "Kill connections from an old source address", 1},
+ { "nokilloldaddr", o_bool,&killoldaddr,
+ "Don't kill connections from an old source address" },
+
{ "--version", o_special_noarg, (void *)showversion,
"Show version number" },
{ "--help", o_special_noarg, (void *)showhelp,
--- ppp-2.4.5/pppd/pppd.h
+++ ppp-2.4.5/pppd/pppd.h
@@ -298,6 +298,9 @@
extern char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
extern bool explicit_remote;/* remote_name specified with remotename opt */
extern bool demand; /* Do dial-on-demand */
+extern bool killoldaddr; /* If our IP is reassigned on
+ reconnect, kill active TCP
+ connections using the old IP. */
extern char *ipparam; /* Extra parameter for ip up/down scripts */
extern bool cryptpap; /* Others' PAP passwords are encrypted */
extern int idle_time_limit;/* Shut down link if idle for this long */
--- ppp-2.4.5/pppd/sys-linux.c
+++ ppp-2.4.5/pppd/sys-linux.c
@@ -165,6 +165,10 @@
#endif /* INET6 */
+#ifndef SIOCKILLADDR
+#define SIOCKILLADDR 0x8939
+#endif
+
/* We can get an EIO error on an ioctl if the modem has hung up */
#define ok_error(num) ((num)==EIO)
@@ -209,6 +213,7 @@
static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
static char proxy_arp_dev[16]; /* Device for proxy arp entry */
static u_int32_t our_old_addr; /* for detecting address changes */
+static u_int32_t our_current_addr;
static int dynaddr_set; /* 1 if ip_dynaddr set */
static int looped; /* 1 if using loop */
static int link_mtu; /* mtu for the link (not bundle) */
@@ -537,6 +542,27 @@
return -1;
}
+static void do_killaddr(u_int32_t oldaddr)
+{
+ struct ifreq ifr;
+
+ memset(&ifr,0,sizeof ifr);
+
+ SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
+ SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
+ SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
+
+ SIN_ADDR(ifr.ifr_addr) = oldaddr;
+
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+
+ if(ioctl(sock_fd,SIOCKILLADDR,&ifr) < 0) {
+ if (!ok_error (errno))
+ error("ioctl(SIOCKILLADDR): %m(%d)", errno);
+ return;
+ }
+}
+
/********************************************************************
*
* tty_disestablish_ppp - Restore the serial port to normal operation.
@@ -2385,21 +2411,29 @@
}
}
- /* set ip_dynaddr in demand mode if address changes */
- if (demand && tune_kernel && !dynaddr_set
- && our_old_addr && our_old_addr != our_adr) {
+ if(persist && our_old_addr && our_old_addr != our_adr) {
+
+ if(killoldaddr)
+ do_killaddr(our_old_addr);
+
+
+ /* set ip_dynaddr in persist mode if address changes */
+ if (tune_kernel && !dynaddr_set) {
/* set ip_dynaddr if possible */
char *path;
int fd;
path = path_to_procfs("/sys/net/ipv4/ip_dynaddr");
if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
- if (write(fd, "1", 1) != 1)
- error("Couldn't enable dynamic IP addressing: %m");
- close(fd);
+ if (write(fd, "1", 1) != 1)
+ error("Couldn't enable dynamic IP addressing: %m");
+ close(fd);
}
dynaddr_set = 1; /* only 1 attempt */
+ }
}
+
+ our_current_addr = our_adr;
our_old_addr = 0;
return 1;
@@ -2455,7 +2489,8 @@
}
our_old_addr = our_adr;
-
+ our_current_addr = 0;
+
return 1;
}
