[PATCH 2/8] IPVS: Split ports[2] into src_port and dst_port

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx>

Avoid sending invalid pointer due to skb_linearize() call.
This patch prepares for next patch where skb_linearize is a part.

In ip_vs_sched_persist() params the ports ptr will be replaced by
src and dst port.

Signed-off-by: Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx>
Acked-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 net/netfilter/ipvs/ip_vs_core.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index e2bb3cd..9acdd79 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -200,7 +200,7 @@ ip_vs_conn_fill_param_persist(const struct ip_vs_service 
*svc,
 static struct ip_vs_conn *
 ip_vs_sched_persist(struct ip_vs_service *svc,
                    struct sk_buff *skb,
-                   __be16 ports[2])
+                   __be16 src_port, __be16 dst_port)
 {
        struct ip_vs_conn *cp = NULL;
        struct ip_vs_iphdr iph;
@@ -224,8 +224,8 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
 
        IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
                      "mnet %s\n",
-                     IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(ports[0]),
-                     IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(ports[1]),
+                     IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(src_port),
+                     IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(dst_port),
                      IP_VS_DBG_ADDR(svc->af, &snet));
 
        /*
@@ -247,14 +247,14 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
                __be16 vport = 0;
 
-               if (ports[1] == svc->port) {
+               if (dst_port == svc->port) {
                        /* non-FTP template:
                         * <protocol, caddr, 0, vaddr, vport, daddr, dport>
                         * FTP template:
                         * <protocol, caddr, 0, vaddr, 0, daddr, 0>
                         */
                        if (svc->port != FTPPORT)
-                               vport = ports[1];
+                               vport = dst_port;
                } else {
                        /* Note: persistent fwmark-based services and
                         * persistent port zero service are handled here.
@@ -285,7 +285,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                        return NULL;
                }
 
-               if (ports[1] == svc->port && svc->port != FTPPORT)
+               if (dst_port == svc->port && svc->port != FTPPORT)
                        dport = dest->port;
 
                /* Create a template
@@ -306,7 +306,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
                kfree(param.pe_data);
        }
 
-       dport = ports[1];
+       dport = dst_port;
        if (dport == svc->port && dest->port)
                dport = dest->port;
 
@@ -317,8 +317,9 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
        /*
         *    Create a new connection according to the template
         */
-       ip_vs_conn_fill_param(svc->af, iph.protocol, &iph.saddr, ports[0],
-                             &iph.daddr, ports[1], &param);
+       ip_vs_conn_fill_param(svc->af, iph.protocol, &iph.saddr, src_port,
+                             &iph.daddr, dst_port, &param);
+
        cp = ip_vs_conn_new(&param, &dest->addr, dport, flags, dest, skb->mark);
        if (cp == NULL) {
                ip_vs_conn_put(ct);
@@ -388,7 +389,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
         */
        if (svc->flags & IP_VS_SVC_F_PERSISTENT) {
                *ignored = 0;
-               return ip_vs_sched_persist(svc, skb, pptr);
+               return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1]);
        }
 
        /*
-- 
1.7.2.3

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