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ipvs: allow rs_table to contain different real server types 

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@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Julian Anastasov 2019-05-05 15:14:38 +03:00 committed by Pablo Neira Ayuso
parent 7b3ed2a137
commit 1da40ab6ca
2 changed files with 38 additions and 8 deletions
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3
include/net/ip_vs.h
View File

@ -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)

43
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -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);