4 files changed, 31 insertions, 11 deletions

diff --git a/include/linux/ip_vs.h b/include/linux/ip_vs.h
index dfc17036284..9708de265bb 100644
--- a/include/linux/ip_vs.h
+++ b/include/linux/ip_vs.h
@@ -19,6 +19,7 @@
  */
 #define IP_VS_SVC_F_PERSISTENT  0x0001          /* persistent port */
 #define IP_VS_SVC_F_HASHED      0x0002          /* hashed entry */
+#define IP_VS_SVC_F_ONEPACKET   0x0004          /* one-packet scheduling */
 
 /*
  *      Destination Server Flags
@@ -85,6 +86,7 @@
 #define IP_VS_CONN_F_SEQ_MASK   0x0600          /* in/out sequence mask */
 #define IP_VS_CONN_F_NO_CPORT   0x0800          /* no client port set yet */
 #define IP_VS_CONN_F_TEMPLATE   0x1000          /* template, not connection */
+#define IP_VS_CONN_F_ONE_PACKET 0x2000          /* forward only one packet */
 
 #define IP_VS_SCHEDNAME_MAXLEN  16
 #define IP_VS_IFNAME_MAXLEN     16
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index d8f7e8ef67b..717e6233d50 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -158,6 +158,9 @@ static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
         unsigned hash;
         int ret;
 
+        if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
+                return 0;
+
         /* Hash by protocol, client address and port */
         hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport);
 
@@ -355,8 +358,9 @@ struct ip_vs_conn *ip_vs_conn_out_get
  */
 void ip_vs_conn_put(struct ip_vs_conn *cp)
 {
-        /* reset it expire in its timeout */
-        mod_timer(&cp->timer, jiffies+cp->timeout);
+        unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
+                0 : cp->timeout;
+        mod_timer(&cp->timer, jiffies+t);
 
         __ip_vs_conn_put(cp);
 }
@@ -649,7 +653,7 @@ static void ip_vs_conn_expire(unsigned long data)
         /*
          *      unhash it if it is hashed in the conn table
          */
-        if (!ip_vs_conn_unhash(cp))
+        if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET))
                 goto expire_later;
 
         /*
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 1cd6e3fd058..50907d8472a 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -194,6 +194,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
         struct ip_vs_dest *dest;
         struct ip_vs_conn *ct;
         __be16  dport;                  /* destination port to forward */
+        __be16  flags;
         union nf_inet_addr snet;        /* source network of the client,
                                            after masking */
 
@@ -340,6 +341,10 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                 dport = ports[1];
         }
 
+        flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+                 && iph.protocol == IPPROTO_UDP)?
+                IP_VS_CONN_F_ONE_PACKET : 0;
+
         /*
          *    Create a new connection according to the template
          */
@@ -347,7 +352,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                             &iph.saddr, ports[0],
                             &iph.daddr, ports[1],
                             &dest->addr, dport,
-                            0,
+                            flags,
                             dest);
         if (cp == NULL) {
                 ip_vs_conn_put(ct);
@@ -377,7 +382,7 @@ ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
         struct ip_vs_conn *cp = NULL;
         struct ip_vs_iphdr iph;
         struct ip_vs_dest *dest;
-        __be16 _ports[2], *pptr;
+        __be16 _ports[2], *pptr, flags;
 
         ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph);
         pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports);
@@ -407,6 +412,10 @@ ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
                 return NULL;
         }
 
+        flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+                 && iph.protocol == IPPROTO_UDP)?
+                IP_VS_CONN_F_ONE_PACKET : 0;
+
         /*
          *    Create a connection entry.
          */
@@ -414,7 +423,7 @@ ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
                             &iph.saddr, pptr[0],
                             &iph.daddr, pptr[1],
                             &dest->addr, dest->port ? dest->port : pptr[1],
-                            0,
+                            flags,
                             dest);
         if (cp == NULL)
                 return NULL;
@@ -464,6 +473,9 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
         if (sysctl_ip_vs_cache_bypass && svc->fwmark && unicast) {
                 int ret, cs;
                 struct ip_vs_conn *cp;
+                __u16 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
+                                iph.protocol == IPPROTO_UDP)?
+                                IP_VS_CONN_F_ONE_PACKET : 0;
                 union nf_inet_addr daddr =  { .all = { 0, 0, 0, 0 } };
 
                 ip_vs_service_put(svc);
@@ -474,7 +486,7 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
                                     &iph.saddr, pptr[0],
                                     &iph.daddr, pptr[1],
                                     &daddr, 0,
-                                    IP_VS_CONN_F_BYPASS,
+                                    IP_VS_CONN_F_BYPASS | flags,
                                     NULL);
                 if (cp == NULL)
                         return NF_DROP;
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 36dc1d88c2f..0f0c079c422 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1864,14 +1864,16 @@ static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
                                            svc->scheduler->name);
                         else
 #endif
-                                seq_printf(seq, "%s  %08X:%04X %s ",
+                                seq_printf(seq, "%s  %08X:%04X %s %s ",
                                            ip_vs_proto_name(svc->protocol),
                                            ntohl(svc->addr.ip),
                                            ntohs(svc->port),
-                                           svc->scheduler->name);
+                                           svc->scheduler->name,
+                                           (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
                 } else {
-                        seq_printf(seq, "FWM  %08X %s ",
-                                   svc->fwmark, svc->scheduler->name);
+                        seq_printf(seq, "FWM  %08X %s %s",
+                                   svc->fwmark, svc->scheduler->name,
+                                   (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
                 }
 
                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)