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author | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
commit | 56c5d900dbb8e042bfad035d18433476931d8f93 (patch) | |
tree | 00b793965beeef10db03e0ff021d2d965c410759 /net/ipv4/ipvs/ip_vs_ftp.c | |
parent | 4dd95b63ae25c5cad6986829b5e8788e9faa0330 (diff) | |
parent | ead9d23d803ea3a73766c3cb27bf7563ac8d7266 (diff) | |
download | op-kernel-dev-56c5d900dbb8e042bfad035d18433476931d8f93.zip op-kernel-dev-56c5d900dbb8e042bfad035d18433476931d8f93.tar.gz |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
sound/core/memalloc.c
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_ftp.c')
-rw-r--r-- | net/ipv4/ipvs/ip_vs_ftp.c | 393 |
1 files changed, 0 insertions, 393 deletions
diff --git a/net/ipv4/ipvs/ip_vs_ftp.c b/net/ipv4/ipvs/ip_vs_ftp.c deleted file mode 100644 index c1c758e..0000000 --- a/net/ipv4/ipvs/ip_vs_ftp.c +++ /dev/null @@ -1,393 +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; - __be32 from; - __be16 port; - struct ip_vs_conn *n_cp; - char buf[24]; /* xxx.xxx.xxx.xxx,ppp,ppp\000 */ - unsigned buf_len; - int ret; - - *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, &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), ntohs(port), NIPQUAD(cp->caddr), 0); - - /* - * Now update or create an connection entry for it - */ - n_cp = ip_vs_conn_out_get(iph->protocol, from, port, - cp->caddr, 0); - if (!n_cp) { - n_cp = ip_vs_conn_new(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 = n_cp->vaddr; - port = n_cp->vport; - sprintf(buf,"%d,%d,%d,%d,%d,%d", NIPQUAD(from), - (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; - __be32 to; - __be16 port; - struct ip_vs_conn *n_cp; - - /* 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, &port, - &start, &end) != 1) - return 1; - - IP_VS_DBG(7, "PORT %u.%u.%u.%u:%d detected\n", - NIPQUAD(to), 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), ntohs(port), NIPQUAD(cp->vaddr), 0); - - n_cp = ip_vs_conn_in_get(iph->protocol, - to, port, - cp->vaddr, htons(ntohs(cp->vport)-1)); - if (!n_cp) { - n_cp = ip_vs_conn_new(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"); |