redonkable/remarkable-linux
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ipvs: fix active FTP

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- Do not create expectation when forwarding the PORT
  command to avoid blocking the connection. The problem is that
  nf_conntrack_ftp.c:help() tries to create the same expectation later in
  POST_ROUTING and drops the packet with "dropping packet" message after
  failure in nf_ct_expect_related.

- Change ip_vs_update_conntrack to alter the conntrack
  for related connections from real server. If we do not alter the reply in
  this direction the next packet from client sent to vport 20 comes as NEW
  connection. We alter it but may be some collision happens for both
  conntracks and the second conntrack gets destroyed immediately. The
  connection stucks too.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2010-09-05 18:02:29 +00:00 committed by David S. Miller
parent 64289c8e68
commit 6523ce1525
4 changed files with 16 additions and 12 deletions
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3
include/net/ip_vs.h
View file

@ -955,6 +955,9 @@ static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
return csum_partial(diff, sizeof(diff), oldsum);
}
extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
int outin);
#endif /* __KERNEL__ */
#endif /* _NET_IP_VS_H */

1
net/netfilter/ipvs/ip_vs_core.c
View file

@ -924,6 +924,7 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
ip_vs_out_stats(cp, skb);
ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pp);
ip_vs_update_conntrack(skb, cp, 0);
ip_vs_conn_put(cp);
skb->ipvs_property = 1;

6
net/netfilter/ipvs/ip_vs_ftp.c
View file

@ -410,7 +410,6 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
union nf_inet_addr to;
__be16 port;
struct ip_vs_conn *n_cp;
struct nf_conn *ct;
#ifdef CONFIG_IP_VS_IPV6
/* This application helper doesn't work with IPv6 yet,
@ -497,11 +496,6 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
ip_vs_control_add(n_cp, cp);
}
ct = (struct nf_conn *)skb->nfct;
if (ct && ct != &nf_conntrack_untracked)
ip_vs_expect_related(skb, ct, n_cp,
IPPROTO_TCP, &n_cp->dport, 1);
/*
* Move tunnel to listen state
*/

18
net/netfilter/ipvs/ip_vs_xmit.c
View file

@ -349,8 +349,8 @@ ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
}
#endif
static void
ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp)
void
ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, int outin)
{
struct nf_conn *ct = (struct nf_conn *)skb->nfct;
struct nf_conntrack_tuple new_tuple;
@ -365,11 +365,17 @@ ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp)
* real-server we will see RIP->DIP.
*/
new_tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
new_tuple.src.u3 = cp->daddr;
if (outin)
new_tuple.src.u3 = cp->daddr;
else
new_tuple.dst.u3 = cp->vaddr;
/*
* This will also take care of UDP and other protocols.
*/
new_tuple.src.u.tcp.port = cp->dport;
if (outin)
new_tuple.src.u.tcp.port = cp->dport;
else
new_tuple.dst.u.tcp.port = cp->vport;
nf_conntrack_alter_reply(ct, &new_tuple);
}
@ -428,7 +434,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
ip_vs_update_conntrack(skb, cp);
ip_vs_update_conntrack(skb, cp, 1);
/* FIXME: when application helper enlarges the packet and the length
is larger than the MTU of outgoing device, there will be still
@ -506,7 +512,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
ip_vs_update_conntrack(skb, cp);
ip_vs_update_conntrack(skb, cp, 1);
/* FIXME: when application helper enlarges the packet and the length
is larger than the MTU of outgoing device, there will be still