[patch v4 11/12] IPVS: Fallback if persistence engine fails

[Simon Horman <horms@xxxxxxxxxxxx>]

Fall back to normal persistence handling if the persistence
engine fails to recognise a packet.

This way, at least the packet will go somewhere.

It is envisaged that iptables could be used to block packets
such if this is not desired although nf_conntrack_sip would
likely need to be enhanced first.

Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
Acked-by: Julian Anastasov <ja@xxxxxx>

---

v2
* Trivial rediff

v3
* Re-diff for addition of inverse parameter to ip_vs_conn_hashkey_param()
  and checking of cp->dest in ip_vs_conn_seq_show()

Index: lvs-test-2.6/net/netfilter/ipvs/ip_vs_conn.c
===================================================================
--- lvs-test-2.6.orig/net/netfilter/ipvs/ip_vs_conn.c   2010-10-02 
10:48:09.000000000 +0900
+++ lvs-test-2.6/net/netfilter/ipvs/ip_vs_conn.c        2010-10-02 
10:48:35.000000000 +0900
@@ -154,7 +154,7 @@ static unsigned int ip_vs_conn_hashkey_p
        const union nf_inet_addr *addr;
        __be16 port;
 
-       if (p->pe && p->pe->hashkey_raw)
+       if (p->pe_data && p->pe->hashkey_raw)
                return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) &
                        ip_vs_conn_tab_mask;
 
@@ -353,7 +353,7 @@ struct ip_vs_conn *ip_vs_ct_in_get(const
        ct_read_lock(hash);
 
        list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
-               if (p->pe && p->pe->ct_match) {
+               if (p->pe_data && p->pe->ct_match) {
                        if (p->pe->ct_match(p, cp))
                                goto out;
                        continue;
@@ -956,7 +956,7 @@ static int ip_vs_conn_seq_show(struct se
                char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
                size_t len = 0;
 
-               if (cp->dest && cp->dest->svc->pe &&
+               if (cp->dest && cp->pe_data &&
                    cp->dest->svc->pe->show_pe_data) {
                        pe_data[0] = ' ';
                        len = strlen(cp->dest->svc->pe->name);
                        memcpy(pe_data + 1, cp->dest->svc->pe->name, len);
Index: lvs-test-2.6/net/netfilter/ipvs/ip_vs_core.c
===================================================================
--- lvs-test-2.6.orig/net/netfilter/ipvs/ip_vs_core.c   2010-10-02 
10:48:09.000000000 +0900
+++ lvs-test-2.6/net/netfilter/ipvs/ip_vs_core.c        2010-10-02 
10:48:35.000000000 +0900
@@ -176,7 +176,7 @@ ip_vs_set_state(struct ip_vs_conn *cp, i
        return pp->state_transition(cp, direction, skb, pp);
 }
 
-static inline int
+static inline void
 ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
                              struct sk_buff *skb, int protocol,
                              const union nf_inet_addr *caddr, __be16 cport,
@@ -186,8 +186,7 @@ ip_vs_conn_fill_param_persist(const stru
        ip_vs_conn_fill_param(svc->af, protocol, caddr, cport, vaddr, vport, p);
        p->pe = svc->pe;
        if (p->pe && p->pe->fill_param)
-               return p->pe->fill_param(p, skb);
-       return 0;
+               p->pe->fill_param(p, skb);
 }
 
 /*
@@ -268,9 +267,8 @@ ip_vs_sched_persist(struct ip_vs_service
                                vaddr = &fwmark;
                        }
                }
-               if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
-                                                 vaddr, vport, &param))
-                       return NULL;
+               ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
+                                             vaddr, vport, &param);
        }
 
        /* Check if a template already exists */

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