[PATCH nf-next 06/15] ipvs: Make ip_vs_schedule aware of inverse iph'es

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Alex Gartrell <agartrell@xxxxxx>

This is necessary to schedule icmp later.

Signed-off-by: Alex Gartrell <agartrell@xxxxxx>
Acked-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 net/netfilter/ipvs/ip_vs_core.c | 50 +++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index ebfb371daa3b..6465e7b3e891 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -245,20 +245,30 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
        const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
        union nf_inet_addr snet;        /* source network of the client,
                                           after masking */
+       const union nf_inet_addr *src_addr, *dst_addr;
+
+       if (likely(!ip_vs_iph_inverse(iph))) {
+               src_addr = &iph->saddr;
+               dst_addr = &iph->daddr;
+       } else {
+               src_addr = &iph->daddr;
+               dst_addr = &iph->saddr;
+       }
+
 
        /* Mask saddr with the netmask to adjust template granularity */
 #ifdef CONFIG_IP_VS_IPV6
        if (svc->af == AF_INET6)
-               ipv6_addr_prefix(&snet.in6, &iph->saddr.in6,
+               ipv6_addr_prefix(&snet.in6, &src_addr->in6,
                                 (__force __u32) svc->netmask);
        else
 #endif
-               snet.ip = iph->saddr.ip & svc->netmask;
+               snet.ip = src_addr->ip & svc->netmask;
 
        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(src_port),
-                     IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port),
+                     IP_VS_DBG_ADDR(svc->af, src_addr), ntohs(src_port),
+                     IP_VS_DBG_ADDR(svc->af, dst_addr), ntohs(dst_port),
                      IP_VS_DBG_ADDR(svc->af, &snet));
 
        /*
@@ -276,7 +286,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
         */
        {
                int protocol = iph->protocol;
-               const union nf_inet_addr *vaddr = &iph->daddr;
+               const union nf_inet_addr *vaddr = dst_addr;
                __be16 vport = 0;
 
                if (dst_port == svc->port) {
@@ -366,8 +376,8 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
        /*
         *    Create a new connection according to the template
         */
-       ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr,
-                             src_port, &iph->daddr, dst_port, &param);
+       ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, src_addr,
+                             src_port, dst_addr, dst_port, &param);
 
        cp = ip_vs_conn_new(&param, dest->af, &dest->addr, dport, flags, dest,
                            skb->mark);
@@ -418,7 +428,8 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
        struct ip_vs_conn *cp = NULL;
        struct ip_vs_scheduler *sched;
        struct ip_vs_dest *dest;
-       __be16 _ports[2], *pptr;
+       __be16 _ports[2], *pptr, cport, vport;
+       const void *caddr, *vaddr;
        unsigned int flags;
 
        *ignored = 1;
@@ -429,13 +440,25 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
        if (pptr == NULL)
                return NULL;
 
+       if (likely(!ip_vs_iph_inverse(iph))) {
+               cport = pptr[0];
+               caddr = &iph->saddr;
+               vport = pptr[1];
+               vaddr = &iph->daddr;
+       } else {
+               cport = pptr[1];
+               caddr = &iph->daddr;
+               vport = pptr[0];
+               vaddr = &iph->saddr;
+       }
+
        /*
         * FTPDATA needs this check when using local real server.
         * Never schedule Active FTPDATA connections from real server.
         * For LVS-NAT they must be already created. For other methods
         * with persistence the connection is created on SYN+ACK.
         */
-       if (pptr[0] == FTPDATA) {
+       if (cport == FTPDATA) {
                IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
                              "Not scheduling FTPDATA");
                return NULL;
@@ -462,7 +485,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
         *    Persistent service
         */
        if (svc->flags & IP_VS_SVC_F_PERSISTENT)
-               return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored,
+               return ip_vs_sched_persist(svc, skb, cport, vport, ignored,
                                           iph);
 
        *ignored = 0;
@@ -470,7 +493,7 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
        /*
         *    Non-persistent service
         */
-       if (!svc->fwmark && pptr[1] != svc->port) {
+       if (!svc->fwmark && vport != svc->port) {
                if (!svc->port)
                        pr_err("Schedule: port zero only supported "
                               "in persistent services, "
@@ -502,10 +525,9 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff 
*skb,
                struct ip_vs_conn_param p;
 
                ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol,
-                                     &iph->saddr, pptr[0], &iph->daddr,
-                                     pptr[1], &p);
+                                     caddr, cport, vaddr, vport, &p);
                cp = ip_vs_conn_new(&p, dest->af, &dest->addr,
-                                   dest->port ? dest->port : pptr[1],
+                                   dest->port ? dest->port : vport,
                                    flags, dest, skb->mark);
                if (!cp) {
                        *ignored = -1;
-- 
2.1.4

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