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Diffstat (limited to 'net/ipv4/ipvs/ip_vs_ftp.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_ftp.c410
1 files changed, 0 insertions, 410 deletions
diff --git a/net/ipv4/ipvs/ip_vs_ftp.c b/net/ipv4/ipvs/ip_vs_ftp.c
deleted file mode 100644
index 2e7dbd8b73a..00000000000
--- a/net/ipv4/ipvs/ip_vs_ftp.c
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
- * ip_vs_ftp.c: IPVS ftp application module
- *
- * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
- *
- * Changes:
- *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Most code here is taken from ip_masq_ftp.c in kernel 2.2. The difference
- * is that ip_vs_ftp module handles the reverse direction to ip_masq_ftp.
- *
- * IP_MASQ_FTP ftp masquerading module
- *
- * Version: @(#)ip_masq_ftp.c 0.04 02/05/96
- *
- * Author: Wouter Gadeyne
- *
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <net/protocol.h>
-#include <net/tcp.h>
-#include <asm/unaligned.h>
-
-#include <net/ip_vs.h>
-
-
-#define SERVER_STRING "227 Entering Passive Mode ("
-#define CLIENT_STRING "PORT "
-
-
-/*
- * List of ports (up to IP_VS_APP_MAX_PORTS) to be handled by helper
- * First port is set to the default port.
- */
-static unsigned short ports[IP_VS_APP_MAX_PORTS] = {21, 0};
-module_param_array(ports, ushort, NULL, 0);
-MODULE_PARM_DESC(ports, "Ports to monitor for FTP control commands");
-
-
-/* Dummy variable */
-static int ip_vs_ftp_pasv;
-
-
-static int
-ip_vs_ftp_init_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
-{
- return 0;
-}
-
-
-static int
-ip_vs_ftp_done_conn(struct ip_vs_app *app, struct ip_vs_conn *cp)
-{
- return 0;
-}
-
-
-/*
- * Get <addr,port> from the string "xxx.xxx.xxx.xxx,ppp,ppp", started
- * with the "pattern" and terminated with the "term" character.
- * <addr,port> is in network order.
- */
-static int ip_vs_ftp_get_addrport(char *data, char *data_limit,
- const char *pattern, size_t plen, char term,
- __be32 *addr, __be16 *port,
- char **start, char **end)
-{
- unsigned char p[6];
- int i = 0;
-
- if (data_limit - data < plen) {
- /* check if there is partial match */
- if (strnicmp(data, pattern, data_limit - data) == 0)
- return -1;
- else
- return 0;
- }
-
- if (strnicmp(data, pattern, plen) != 0) {
- return 0;
- }
- *start = data + plen;
-
- for (data = *start; *data != term; data++) {
- if (data == data_limit)
- return -1;
- }
- *end = data;
-
- memset(p, 0, sizeof(p));
- for (data = *start; data != *end; data++) {
- if (*data >= '0' && *data <= '9') {
- p[i] = p[i]*10 + *data - '0';
- } else if (*data == ',' && i < 5) {
- i++;
- } else {
- /* unexpected character */
- return -1;
- }
- }
-
- if (i != 5)
- return -1;
-
- *addr = get_unaligned((__be32 *)p);
- *port = get_unaligned((__be16 *)(p + 4));
- return 1;
-}
-
-
-/*
- * 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,
- * client port 0 (unknown at the moment), the server address and the
- * server port. Mark the current connection entry as a control channel
- * of the new entry. All this work is just to make the data connection
- * can be scheduled to the right server later.
- *
- * The outgoing packet should be something like
- * "227 Entering Passive Mode (xxx,xxx,xxx,xxx,ppp,ppp)".
- * xxx,xxx,xxx,xxx is the server address, ppp,ppp is the server port number.
- */
-static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
- struct sk_buff *skb, int *diff)
-{
- struct iphdr *iph;
- struct tcphdr *th;
- char *data, *data_limit;
- char *start, *end;
- union nf_inet_addr from;
- __be16 port;
- struct ip_vs_conn *n_cp;
- char buf[24]; /* xxx.xxx.xxx.xxx,ppp,ppp\000 */
- unsigned buf_len;
- int ret;
-
-#ifdef CONFIG_IP_VS_IPV6
- /* This application helper doesn't work with IPv6 yet,
- * so turn this into a no-op for IPv6 packets
- */
- if (cp->af == AF_INET6)
- return 1;
-#endif
-
- *diff = 0;
-
- /* Only useful for established sessions */
- if (cp->state != IP_VS_TCP_S_ESTABLISHED)
- return 1;
-
- /* Linear packets are much easier to deal with. */
- if (!skb_make_writable(skb, skb->len))
- return 0;
-
- if (cp->app_data == &ip_vs_ftp_pasv) {
- iph = ip_hdr(skb);
- th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
- data = (char *)th + (th->doff << 2);
- data_limit = skb_tail_pointer(skb);
-
- if (ip_vs_ftp_get_addrport(data, data_limit,
- SERVER_STRING,
- sizeof(SERVER_STRING)-1, ')',
- &from.ip, &port,
- &start, &end) != 1)
- return 1;
-
- IP_VS_DBG(7, "PASV response (%u.%u.%u.%u:%d) -> "
- "%u.%u.%u.%u:%d detected\n",
- NIPQUAD(from.ip), ntohs(port),
- NIPQUAD(cp->caddr.ip), 0);
-
- /*
- * 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);
- 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,
- cp->dest);
- if (!n_cp)
- return 0;
-
- /* add its controller */
- ip_vs_control_add(n_cp, cp);
- }
-
- /*
- * Replace the old passive address with the new one
- */
- from.ip = n_cp->vaddr.ip;
- port = n_cp->vport;
- sprintf(buf, "%d,%d,%d,%d,%d,%d", NIPQUAD(from.ip),
- (ntohs(port)>>8)&255, ntohs(port)&255);
- buf_len = strlen(buf);
-
- /*
- * Calculate required delta-offset to keep TCP happy
- */
- *diff = buf_len - (end-start);
-
- if (*diff == 0) {
- /* simply replace it with new passive address */
- memcpy(start, buf, buf_len);
- ret = 1;
- } else {
- ret = !ip_vs_skb_replace(skb, GFP_ATOMIC, start,
- end-start, buf, buf_len);
- }
-
- cp->app_data = NULL;
- ip_vs_tcp_conn_listen(n_cp);
- ip_vs_conn_put(n_cp);
- return ret;
- }
- return 1;
-}
-
-
-/*
- * Look at incoming ftp packets to catch the PASV/PORT command
- * (outside-to-inside).
- *
- * The incoming packet having the PORT command should be something like
- * "PORT xxx,xxx,xxx,xxx,ppp,ppp\n".
- * xxx,xxx,xxx,xxx is the client address, ppp,ppp is the client port number.
- * In this case, we create a connection entry using the client address and
- * port, so that the active ftp data connection from the server can reach
- * the client.
- */
-static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
- struct sk_buff *skb, int *diff)
-{
- struct iphdr *iph;
- struct tcphdr *th;
- char *data, *data_start, *data_limit;
- char *start, *end;
- union nf_inet_addr to;
- __be16 port;
- struct ip_vs_conn *n_cp;
-
-#ifdef CONFIG_IP_VS_IPV6
- /* This application helper doesn't work with IPv6 yet,
- * so turn this into a no-op for IPv6 packets
- */
- if (cp->af == AF_INET6)
- return 1;
-#endif
-
- /* no diff required for incoming packets */
- *diff = 0;
-
- /* Only useful for established sessions */
- if (cp->state != IP_VS_TCP_S_ESTABLISHED)
- return 1;
-
- /* Linear packets are much easier to deal with. */
- if (!skb_make_writable(skb, skb->len))
- return 0;
-
- /*
- * Detecting whether it is passive
- */
- iph = ip_hdr(skb);
- th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
-
- /* Since there may be OPTIONS in the TCP packet and the HLEN is
- the length of the header in 32-bit multiples, it is accurate
- to calculate data address by th+HLEN*4 */
- data = data_start = (char *)th + (th->doff << 2);
- data_limit = skb_tail_pointer(skb);
-
- while (data <= data_limit - 6) {
- if (strnicmp(data, "PASV\r\n", 6) == 0) {
- /* Passive mode on */
- IP_VS_DBG(7, "got PASV at %td of %td\n",
- data - data_start,
- data_limit - data_start);
- cp->app_data = &ip_vs_ftp_pasv;
- return 1;
- }
- data++;
- }
-
- /*
- * To support virtual FTP server, the scenerio is as follows:
- * FTP client ----> Load Balancer ----> FTP server
- * First detect the port number in the application data,
- * then create a new connection entry for the coming data
- * connection.
- */
- if (ip_vs_ftp_get_addrport(data_start, data_limit,
- CLIENT_STRING, sizeof(CLIENT_STRING)-1,
- '\r', &to.ip, &port,
- &start, &end) != 1)
- return 1;
-
- IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n",
- NIPQUAD(to.ip), ntohs(port));
-
- /* Passive mode off */
- cp->app_data = NULL;
-
- /*
- * Now update or create a connection entry for it
- */
- IP_VS_DBG(7, "protocol %s %u.%u.%u.%u:%d %u.%u.%u.%u:%d\n",
- ip_vs_proto_name(iph->protocol),
- NIPQUAD(to.ip), ntohs(port), NIPQUAD(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,
- &cp->vaddr, htons(ntohs(cp->vport)-1),
- &cp->daddr, htons(ntohs(cp->dport)-1),
- 0,
- cp->dest);
- if (!n_cp)
- return 0;
-
- /* add its controller */
- ip_vs_control_add(n_cp, cp);
- }
-
- /*
- * Move tunnel to listen state
- */
- ip_vs_tcp_conn_listen(n_cp);
- ip_vs_conn_put(n_cp);
-
- return 1;
-}
-
-
-static struct ip_vs_app ip_vs_ftp = {
- .name = "ftp",
- .type = IP_VS_APP_TYPE_FTP,
- .protocol = IPPROTO_TCP,
- .module = THIS_MODULE,
- .incs_list = LIST_HEAD_INIT(ip_vs_ftp.incs_list),
- .init_conn = ip_vs_ftp_init_conn,
- .done_conn = ip_vs_ftp_done_conn,
- .bind_conn = NULL,
- .unbind_conn = NULL,
- .pkt_out = ip_vs_ftp_out,
- .pkt_in = ip_vs_ftp_in,
-};
-
-
-/*
- * ip_vs_ftp initialization
- */
-static int __init ip_vs_ftp_init(void)
-{
- int i, ret;
- struct ip_vs_app *app = &ip_vs_ftp;
-
- ret = register_ip_vs_app(app);
- if (ret)
- return ret;
-
- for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
- if (!ports[i])
- continue;
- ret = register_ip_vs_app_inc(app, app->protocol, ports[i]);
- if (ret)
- break;
- IP_VS_INFO("%s: loaded support on port[%d] = %d\n",
- app->name, i, ports[i]);
- }
-
- if (ret)
- unregister_ip_vs_app(app);
-
- return ret;
-}
-
-
-/*
- * ip_vs_ftp finish.
- */
-static void __exit ip_vs_ftp_exit(void)
-{
- unregister_ip_vs_app(&ip_vs_ftp);
-}
-
-
-module_init(ip_vs_ftp_init);
-module_exit(ip_vs_ftp_exit);
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 03:00:47 +0000