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path: root/net/netfilter/ipvs/ip_vs_ftp.c
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Diffstat (limited to 'net/netfilter/ipvs/ip_vs_ftp.c')
-rw-r--r--net/netfilter/ipvs/ip_vs_ftp.c146
1 files changed, 7 insertions, 139 deletions
diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 7e9af5b76d9e..9cd375f94d61 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -20,17 +20,6 @@
*
* Author: Wouter Gadeyne
*
- *
- * Code for ip_vs_expect_related and ip_vs_expect_callback is taken from
- * http://www.ssi.bg/~ja/nfct/:
- *
- * ip_vs_nfct.c: Netfilter connection tracking support for IPVS
- *
- * Portions Copyright (C) 2001-2002
- * Antefacto Ltd, 181 Parnell St, Dublin 1, Ireland.
- *
- * Portions Copyright (C) 2003-2008
- * Julian Anastasov
*/
#define KMSG_COMPONENT "IPVS"
@@ -58,16 +47,6 @@
#define SERVER_STRING "227 Entering Passive Mode ("
#define CLIENT_STRING "PORT "
-#define FMT_TUPLE "%pI4:%u->%pI4:%u/%u"
-#define ARG_TUPLE(T) &(T)->src.u3.ip, ntohs((T)->src.u.all), \
- &(T)->dst.u3.ip, ntohs((T)->dst.u.all), \
- (T)->dst.protonum
-
-#define FMT_CONN "%pI4:%u->%pI4:%u->%pI4:%u/%u:%u"
-#define ARG_CONN(C) &((C)->caddr.ip), ntohs((C)->cport), \
- &((C)->vaddr.ip), ntohs((C)->vport), \
- &((C)->daddr.ip), ntohs((C)->dport), \
- (C)->protocol, (C)->state
/*
* List of ports (up to IP_VS_APP_MAX_PORTS) to be handled by helper
@@ -85,6 +64,8 @@ static int ip_vs_ftp_pasv;
static int
ip_vs_ftp_init_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
{
+ /* We use connection tracking for the command connection */
+ cp->flags |= IP_VS_CONN_F_NFCT;
return 0;
}
@@ -149,120 +130,6 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit,
}
/*
- * Called from init_conntrack() as expectfn handler.
- */
-static void
-ip_vs_expect_callback(struct nf_conn *ct,
- struct nf_conntrack_expect *exp)
-{
- struct nf_conntrack_tuple *orig, new_reply;
- struct ip_vs_conn *cp;
-
- if (exp->tuple.src.l3num != PF_INET)
- return;
-
- /*
- * We assume that no NF locks are held before this callback.
- * ip_vs_conn_out_get and ip_vs_conn_in_get should match their
- * expectations even if they use wildcard values, now we provide the
- * actual values from the newly created original conntrack direction.
- * The conntrack is confirmed when packet reaches IPVS hooks.
- */
-
- /* RS->CLIENT */
- orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
- cp = ip_vs_conn_out_get(exp->tuple.src.l3num, orig->dst.protonum,
- &orig->src.u3, orig->src.u.tcp.port,
- &orig->dst.u3, orig->dst.u.tcp.port);
- if (cp) {
- /* Change reply CLIENT->RS to CLIENT->VS */
- new_reply = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- IP_VS_DBG(7, "%s(): ct=%p, status=0x%lX, tuples=" FMT_TUPLE ", "
- FMT_TUPLE ", found inout cp=" FMT_CONN "\n",
- __func__, ct, ct->status,
- ARG_TUPLE(orig), ARG_TUPLE(&new_reply),
- ARG_CONN(cp));
- new_reply.dst.u3 = cp->vaddr;
- new_reply.dst.u.tcp.port = cp->vport;
- IP_VS_DBG(7, "%s(): ct=%p, new tuples=" FMT_TUPLE ", " FMT_TUPLE
- ", inout cp=" FMT_CONN "\n",
- __func__, ct,
- ARG_TUPLE(orig), ARG_TUPLE(&new_reply),
- ARG_CONN(cp));
- goto alter;
- }
-
- /* CLIENT->VS */
- cp = ip_vs_conn_in_get(exp->tuple.src.l3num, orig->dst.protonum,
- &orig->src.u3, orig->src.u.tcp.port,
- &orig->dst.u3, orig->dst.u.tcp.port);
- if (cp) {
- /* Change reply VS->CLIENT to RS->CLIENT */
- new_reply = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- IP_VS_DBG(7, "%s(): ct=%p, status=0x%lX, tuples=" FMT_TUPLE ", "
- FMT_TUPLE ", found outin cp=" FMT_CONN "\n",
- __func__, ct, ct->status,
- ARG_TUPLE(orig), ARG_TUPLE(&new_reply),
- ARG_CONN(cp));
- new_reply.src.u3 = cp->daddr;
- new_reply.src.u.tcp.port = cp->dport;
- IP_VS_DBG(7, "%s(): ct=%p, new tuples=" FMT_TUPLE ", "
- FMT_TUPLE ", outin cp=" FMT_CONN "\n",
- __func__, ct,
- ARG_TUPLE(orig), ARG_TUPLE(&new_reply),
- ARG_CONN(cp));
- goto alter;
- }
-
- IP_VS_DBG(7, "%s(): ct=%p, status=0x%lX, tuple=" FMT_TUPLE
- " - unknown expect\n",
- __func__, ct, ct->status, ARG_TUPLE(orig));
- return;
-
-alter:
- /* Never alter conntrack for non-NAT conns */
- if (IP_VS_FWD_METHOD(cp) == IP_VS_CONN_F_MASQ)
- nf_conntrack_alter_reply(ct, &new_reply);
- ip_vs_conn_put(cp);
- return;
-}
-
-/*
- * Create NF conntrack expectation with wildcard (optional) source port.
- * Then the default callback function will alter the reply and will confirm
- * the conntrack entry when the first packet comes.
- */
-static void
-ip_vs_expect_related(struct sk_buff *skb, struct nf_conn *ct,
- struct ip_vs_conn *cp, u_int8_t proto,
- const __be16 *port, int from_rs)
-{
- struct nf_conntrack_expect *exp;
-
- BUG_ON(!ct || ct == &nf_conntrack_untracked);
-
- exp = nf_ct_expect_alloc(ct);
- if (!exp)
- return;
-
- if (from_rs)
- nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
- nf_ct_l3num(ct), &cp->daddr, &cp->caddr,
- proto, port, &cp->cport);
- else
- nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
- nf_ct_l3num(ct), &cp->caddr, &cp->vaddr,
- proto, port, &cp->vport);
-
- exp->expectfn = ip_vs_expect_callback;
-
- IP_VS_DBG(7, "%s(): ct=%p, expect tuple=" FMT_TUPLE "\n",
- __func__, ct, ARG_TUPLE(&exp->tuple));
- nf_ct_expect_related(exp);
- nf_ct_expect_put(exp);
-}
-
-/*
* Look at outgoing ftp packets to catch the response to a PASV command
* from the server (inside-to-outside).
* When we see one, we build a connection entry with the client address,
@@ -335,7 +202,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
&cp->caddr, 0,
&cp->vaddr, port,
&from, port,
- IP_VS_CONN_F_NO_CPORT,
+ IP_VS_CONN_F_NO_CPORT |
+ IP_VS_CONN_F_NFCT,
cp->dest);
if (!n_cp)
return 0;
@@ -371,8 +239,8 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
start-data, end-start,
buf, buf_len);
if (ret)
- ip_vs_expect_related(skb, ct, n_cp,
- IPPROTO_TCP, NULL, 0);
+ ip_vs_nfct_expect_related(skb, ct, n_cp,
+ IPPROTO_TCP, 0, 0);
}
/*
@@ -487,7 +355,7 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
&to, port,
&cp->vaddr, htons(ntohs(cp->vport)-1),
&cp->daddr, htons(ntohs(cp->dport)-1),
- 0,
+ IP_VS_CONN_F_NFCT,
cp->dest);
if (!n_cp)
return 0;
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-01 13:44:35 +0000