[PATCH net-next 1/3] ipvs: allow rs_table to contain different real server types

[Julian Anastasov <ja@xxxxxx>]

Before now rs_table was used only for NAT real servers.
Change it to allow TUN real severs from different types,
possibly hashed with different port key.

Signed-off-by: Julian Anastasov <ja@xxxxxx>
---
 include/net/ip_vs.h            |  3 +++
 net/netfilter/ipvs/ip_vs_ctl.c | 43 +++++++++++++++++++++++++++-------
 2 files changed, 38 insertions(+), 8 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 2ac40135b576..9a8ac8997e34 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -1497,6 +1497,9 @@ static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
 #endif
 
+#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
+                                IP_VS_CONN_F_FWD_MASK)
+
 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
 
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 328683452229..7de90c00c8bd 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -515,15 +515,36 @@ static inline unsigned int ip_vs_rs_hashkey(int af,
 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 {
        unsigned int hash;
+       __be16 port;
 
        if (dest->in_rs_table)
                return;
 
+       switch (IP_VS_DFWD_METHOD(dest)) {
+       case IP_VS_CONN_F_MASQ:
+               port = dest->port;
+               break;
+       case IP_VS_CONN_F_TUNNEL:
+               switch (dest->tun_type) {
+               case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
+                       port = dest->tun_port;
+                       break;
+               case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
+                       port = 0;
+                       break;
+               default:
+                       return;
+               }
+               break;
+       default:
+               return;
+       }
+
        /*
         *      Hash by proto,addr,port,
         *      which are the parameters of the real service.
         */
-       hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
+       hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port);
 
        hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
        dest->in_rs_table = 1;
@@ -555,7 +576,8 @@ bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int 
af, __u16 protocol,
                if (dest->port == dport &&
                    dest->af == af &&
                    ip_vs_addr_equal(af, &dest->addr, daddr) &&
-                   (dest->protocol == protocol || dest->vfwmark)) {
+                   (dest->protocol == protocol || dest->vfwmark) &&
+                   (IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ)) {
                        /* HIT */
                        return true;
                }
@@ -585,7 +607,8 @@ struct ip_vs_dest *ip_vs_find_real_service(struct 
netns_ipvs *ipvs, int af,
                if (dest->port == dport &&
                    dest->af == af &&
                    ip_vs_addr_equal(af, &dest->addr, daddr) &&
-                       (dest->protocol == protocol || dest->vfwmark)) {
+                   (dest->protocol == protocol || dest->vfwmark) &&
+                   (IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ)) {
                        /* HIT */
                        return dest;
                }
@@ -831,6 +854,13 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct 
ip_vs_dest *dest,
        conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
        conn_flags |= IP_VS_CONN_F_INACTIVE;
 
+       /* Need to rehash? */
+       if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) !=
+           IP_VS_DFWD_METHOD(dest) ||
+           udest->tun_type != dest->tun_type ||
+           udest->tun_port != dest->tun_port)
+               ip_vs_rs_unhash(dest);
+
        /* set the tunnel info */
        dest->tun_type = udest->tun_type;
        dest->tun_port = udest->tun_port;
@@ -839,16 +869,13 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct 
ip_vs_dest *dest,
        if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
                conn_flags |= IP_VS_CONN_F_NOOUTPUT;
        } else {
-               /*
-                *    Put the real service in rs_table if not present.
-                *    For now only for NAT!
-                */
-               ip_vs_rs_hash(ipvs, dest);
                /* FTP-NAT requires conntrack for mangling */
                if (svc->port == FTPPORT)
                        ip_vs_register_conntrack(svc);
        }
        atomic_set(&dest->conn_flags, conn_flags);
+       /* Put the real service in rs_table if not present. */
+       ip_vs_rs_hash(ipvs, dest);
 
        /* bind the service */
        old_svc = rcu_dereference_protected(dest->svc, 1);
-- 
2.17.1