diff options
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_ftp.c')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_ftp.c | 194 |
1 files changed, 36 insertions, 158 deletions
diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c index 7e9af5b76d9..75455000ad1 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, @@ -328,14 +195,19 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp, /* * Now update or create an connection entry for it */ - n_cp = ip_vs_conn_out_get(AF_INET, iph->protocol, &from, port, - &cp->caddr, 0); + { + struct ip_vs_conn_param p; + ip_vs_conn_fill_param(AF_INET, iph->protocol, + &from, port, &cp->caddr, 0, &p); + n_cp = ip_vs_conn_out_get(&p); + } if (!n_cp) { - n_cp = ip_vs_conn_new(AF_INET, IPPROTO_TCP, - &cp->caddr, 0, - &cp->vaddr, port, - &from, port, - IP_VS_CONN_F_NO_CPORT, + struct ip_vs_conn_param p; + ip_vs_conn_fill_param(AF_INET, IPPROTO_TCP, &cp->caddr, + 0, &cp->vaddr, port, &p); + n_cp = ip_vs_conn_new(&p, &from, port, + IP_VS_CONN_F_NO_CPORT | + IP_VS_CONN_F_NFCT, cp->dest); if (!n_cp) return 0; @@ -370,9 +242,14 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp, ret = nf_nat_mangle_tcp_packet(skb, ct, ctinfo, start-data, end-start, buf, buf_len); - if (ret) - ip_vs_expect_related(skb, ct, n_cp, - IPPROTO_TCP, NULL, 0); + if (ret) { + ip_vs_nfct_expect_related(skb, ct, n_cp, + IPPROTO_TCP, 0, 0); + if (skb->ip_summed == CHECKSUM_COMPLETE) + skb->ip_summed = CHECKSUM_UNNECESSARY; + /* csum is updated */ + ret = 1; + } } /* @@ -479,21 +356,22 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp, ip_vs_proto_name(iph->protocol), &to.ip, ntohs(port), &cp->vaddr.ip, 0); - n_cp = ip_vs_conn_in_get(AF_INET, iph->protocol, - &to, port, - &cp->vaddr, htons(ntohs(cp->vport)-1)); - if (!n_cp) { - n_cp = ip_vs_conn_new(AF_INET, IPPROTO_TCP, - &to, port, + { + struct ip_vs_conn_param p; + ip_vs_conn_fill_param(AF_INET, iph->protocol, &to, port, &cp->vaddr, htons(ntohs(cp->vport)-1), - &cp->daddr, htons(ntohs(cp->dport)-1), - 0, - cp->dest); - if (!n_cp) - return 0; + &p); + n_cp = ip_vs_conn_in_get(&p); + if (!n_cp) { + n_cp = ip_vs_conn_new(&p, &cp->daddr, + htons(ntohs(cp->dport)-1), + IP_VS_CONN_F_NFCT, cp->dest); + if (!n_cp) + return 0; - /* add its controller */ - ip_vs_control_add(n_cp, cp); + /* add its controller */ + ip_vs_control_add(n_cp, cp); + } } /* |