3 files changed, 17 insertions, 2 deletions

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 23032d9d6071..a17745c80a91 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -346,6 +346,7 @@ enum
         NET_TCP_MODERATE_RCVBUF=106,
         NET_TCP_TSO_WIN_DIVISOR=107,
         NET_TCP_BIC_BETA=108,
+        NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR=109,
 };
 
 enum {
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 85bf0d3e294b..cb759484979d 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -207,6 +207,7 @@ int sysctl_icmp_ignore_bogus_error_responses;
 
 int sysctl_icmp_ratelimit = 1 * HZ;
 int sysctl_icmp_ratemask = 0x1818;
+int sysctl_icmp_errors_use_inbound_ifaddr;
 
 /*
  *      ICMP control array. This specifies what to do with each ICMP.
@@ -511,8 +512,12 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, u32 info)
          */
 
         saddr = iph->daddr;
-        if (!(rt->rt_flags & RTCF_LOCAL))
-                saddr = 0;
+        if (!(rt->rt_flags & RTCF_LOCAL)) {
+                if (sysctl_icmp_errors_use_inbound_ifaddr)
+                        saddr = inet_select_addr(skb_in->dev, 0, RT_SCOPE_LINK);
+                else
+                        saddr = 0;
+        }
 
         tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) |
                                            IPTOS_PREC_INTERNETCONTROL) :
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 3aafb298c1c1..23068bddbf0b 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -23,6 +23,7 @@ extern int sysctl_ip_nonlocal_bind;
 extern int sysctl_icmp_echo_ignore_all;
 extern int sysctl_icmp_echo_ignore_broadcasts;
 extern int sysctl_icmp_ignore_bogus_error_responses;
+extern int sysctl_icmp_errors_use_inbound_ifaddr;
 
 /* From ip_fragment.c */
 extern int sysctl_ipfrag_low_thresh;
@@ -396,6 +397,14 @@ ctl_table ipv4_table[] = {
                 .proc_handler   = &proc_dointvec
         },
         {
+                .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
+                .procname       = "icmp_errors_use_inbound_ifaddr",
+                .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec
+        },
+        {
                 .ctl_name       = NET_IPV4_ROUTE,
                 .procname       = "route",
                 .maxlen         = 0,