Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 658 insertions, 0 deletions

diff --git a/net/ipv4/ipvs/ip_vs_app.c b/net/ipv4/ipvs/ip_vs_app.c
new file mode 100644
index 000000000000..d9212addd193
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_app.c
@@ -0,0 +1,658 @@
+/*
+ * ip_vs_app.c: Application module support for IPVS
+ *
+ * Version:     $Id: ip_vs_app.c,v 1.17 2003/03/22 06:31:21 wensong Exp $
+ *
+ * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
+ *
+ *              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_app.c in kernel 2.2. The difference
+ * is that ip_vs_app module handles the reverse direction (incoming requests
+ * and outgoing responses).
+ *
+ *              IP_MASQ_APP application masquerading module
+ *
+ * Author:      Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/protocol.h>
+#include <asm/system.h>
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <net/ip_vs.h>
+
+EXPORT_SYMBOL(register_ip_vs_app);
+EXPORT_SYMBOL(unregister_ip_vs_app);
+EXPORT_SYMBOL(register_ip_vs_app_inc);
+
+/* ipvs application list head */
+static LIST_HEAD(ip_vs_app_list);
+static DECLARE_MUTEX(__ip_vs_app_mutex);
+
+
+/*
+ *      Get an ip_vs_app object
+ */
+static inline int ip_vs_app_get(struct ip_vs_app *app)
+{
+        /* test and get the module atomically */
+        if (app->module)
+                return try_module_get(app->module);
+        else
+                return 1;
+}
+
+
+static inline void ip_vs_app_put(struct ip_vs_app *app)
+{
+        if (app->module)
+                module_put(app->module);
+}
+
+
+/*
+ *      Allocate/initialize app incarnation and register it in proto apps.
+ */
+static int
+ip_vs_app_inc_new(struct ip_vs_app *app, __u16 proto, __u16 port)
+{
+        struct ip_vs_protocol *pp;
+        struct ip_vs_app *inc;
+        int ret;
+
+        if (!(pp = ip_vs_proto_get(proto)))
+                return -EPROTONOSUPPORT;
+
+        if (!pp->unregister_app)
+                return -EOPNOTSUPP;
+
+        inc = kmalloc(sizeof(struct ip_vs_app), GFP_KERNEL);
+        if (!inc)
+                return -ENOMEM;
+        memcpy(inc, app, sizeof(*inc));
+        INIT_LIST_HEAD(&inc->p_list);
+        INIT_LIST_HEAD(&inc->incs_list);
+        inc->app = app;
+        inc->port = htons(port);
+        atomic_set(&inc->usecnt, 0);
+
+        if (app->timeouts) {
+                inc->timeout_table =
+                        ip_vs_create_timeout_table(app->timeouts,
+                                                   app->timeouts_size);
+                if (!inc->timeout_table) {
+                        ret = -ENOMEM;
+                        goto out;
+                }
+        }
+
+        ret = pp->register_app(inc);
+        if (ret)
+                goto out;
+
+        list_add(&inc->a_list, &app->incs_list);
+        IP_VS_DBG(9, "%s application %s:%u registered\n",
+                  pp->name, inc->name, inc->port);
+
+        return 0;
+
+  out:
+        if (inc->timeout_table)
+                kfree(inc->timeout_table);
+        kfree(inc);
+        return ret;
+}
+
+
+/*
+ *      Release app incarnation
+ */
+static void
+ip_vs_app_inc_release(struct ip_vs_app *inc)
+{
+        struct ip_vs_protocol *pp;
+
+        if (!(pp = ip_vs_proto_get(inc->protocol)))
+                return;
+
+        if (pp->unregister_app)
+                pp->unregister_app(inc);
+
+        IP_VS_DBG(9, "%s App %s:%u unregistered\n",
+                  pp->name, inc->name, inc->port);
+
+        list_del(&inc->a_list);
+
+        if (inc->timeout_table != NULL)
+                kfree(inc->timeout_table);
+        kfree(inc);
+}
+
+
+/*
+ *      Get reference to app inc (only called from softirq)
+ *
+ */
+int ip_vs_app_inc_get(struct ip_vs_app *inc)
+{
+        int result;
+
+        atomic_inc(&inc->usecnt);
+        if (unlikely((result = ip_vs_app_get(inc->app)) != 1))
+                atomic_dec(&inc->usecnt);
+        return result;
+}
+
+
+/*
+ *      Put the app inc (only called from timer or net softirq)
+ */
+void ip_vs_app_inc_put(struct ip_vs_app *inc)
+{
+        ip_vs_app_put(inc->app);
+        atomic_dec(&inc->usecnt);
+}
+
+
+/*
+ *      Register an application incarnation in protocol applications
+ */
+int
+register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port)
+{
+        int result;
+
+        down(&__ip_vs_app_mutex);
+
+        result = ip_vs_app_inc_new(app, proto, port);
+
+        up(&__ip_vs_app_mutex);
+
+        return result;
+}
+
+
+/*
+ *      ip_vs_app registration routine
+ */
+int register_ip_vs_app(struct ip_vs_app *app)
+{
+        /* increase the module use count */
+        ip_vs_use_count_inc();
+
+        down(&__ip_vs_app_mutex);
+
+        list_add(&app->a_list, &ip_vs_app_list);
+
+        up(&__ip_vs_app_mutex);
+
+        return 0;
+}
+
+
+/*
+ *      ip_vs_app unregistration routine
+ *      We are sure there are no app incarnations attached to services
+ */
+void unregister_ip_vs_app(struct ip_vs_app *app)
+{
+        struct ip_vs_app *inc, *nxt;
+
+        down(&__ip_vs_app_mutex);
+
+        list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) {
+                ip_vs_app_inc_release(inc);
+        }
+
+        list_del(&app->a_list);
+
+        up(&__ip_vs_app_mutex);
+
+        /* decrease the module use count */
+        ip_vs_use_count_dec();
+}
+
+
+#if 0000
+/*
+ *      Get reference to app by name (called from user context)
+ */
+struct ip_vs_app *ip_vs_app_get_by_name(char *appname)
+{
+        struct ip_vs_app *app, *a = NULL;
+
+        down(&__ip_vs_app_mutex);
+
+        list_for_each_entry(ent, &ip_vs_app_list, a_list) {
+                if (strcmp(app->name, appname))
+                        continue;
+
+                /* softirq may call ip_vs_app_get too, so the caller
+                   must disable softirq on the current CPU */
+                if (ip_vs_app_get(app))
+                        a = app;
+                break;
+        }
+
+        up(&__ip_vs_app_mutex);
+
+        return a;
+}
+#endif
+
+
+/*
+ *      Bind ip_vs_conn to its ip_vs_app (called by cp constructor)
+ */
+int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp)
+{
+        return pp->app_conn_bind(cp);
+}
+
+
+/*
+ *      Unbind cp from application incarnation (called by cp destructor)
+ */
+void ip_vs_unbind_app(struct ip_vs_conn *cp)
+{
+        struct ip_vs_app *inc = cp->app;
+
+        if (!inc)
+                return;
+
+        if (inc->unbind_conn)
+                inc->unbind_conn(inc, cp);
+        if (inc->done_conn)
+                inc->done_conn(inc, cp);
+        ip_vs_app_inc_put(inc);
+        cp->app = NULL;
+}
+
+
+/*
+ *      Fixes th->seq based on ip_vs_seq info.
+ */
+static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th)
+{
+        __u32 seq = ntohl(th->seq);
+
+        /*
+         *      Adjust seq with delta-offset for all packets after
+         *      the most recent resized pkt seq and with previous_delta offset
+         *      for all packets before most recent resized pkt seq.
+         */
+        if (vseq->delta || vseq->previous_delta) {
+                if(after(seq, vseq->init_seq)) {
+                        th->seq = htonl(seq + vseq->delta);
+                        IP_VS_DBG(9, "vs_fix_seq(): added delta (%d) to seq\n",
+                                  vseq->delta);
+                } else {
+                        th->seq = htonl(seq + vseq->previous_delta);
+                        IP_VS_DBG(9, "vs_fix_seq(): added previous_delta "
+                                  "(%d) to seq\n", vseq->previous_delta);
+                }
+        }
+}
+
+
+/*
+ *      Fixes th->ack_seq based on ip_vs_seq info.
+ */
+static inline void
+vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th)
+{
+        __u32 ack_seq = ntohl(th->ack_seq);
+
+        /*
+         * Adjust ack_seq with delta-offset for
+         * the packets AFTER most recent resized pkt has caused a shift
+         * for packets before most recent resized pkt, use previous_delta
+         */
+        if (vseq->delta || vseq->previous_delta) {
+                /* since ack_seq is the number of octet that is expected
+                   to receive next, so compare it with init_seq+delta */
+                if(after(ack_seq, vseq->init_seq+vseq->delta)) {
+                        th->ack_seq = htonl(ack_seq - vseq->delta);
+                        IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted delta "
+                                  "(%d) from ack_seq\n", vseq->delta);
+
+                } else {
+                        th->ack_seq = htonl(ack_seq - vseq->previous_delta);
+                        IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted "
+                                  "previous_delta (%d) from ack_seq\n",
+                                  vseq->previous_delta);
+                }
+        }
+}
+
+
+/*
+ *      Updates ip_vs_seq if pkt has been resized
+ *      Assumes already checked proto==IPPROTO_TCP and diff!=0.
+ */
+static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq,
+                                 unsigned flag, __u32 seq, int diff)
+{
+        /* spinlock is to keep updating cp->flags atomic */
+        spin_lock(&cp->lock);
+        if (!(cp->flags & flag) || after(seq, vseq->init_seq)) {
+                vseq->previous_delta = vseq->delta;
+                vseq->delta += diff;
+                vseq->init_seq = seq;
+                cp->flags |= flag;
+        }
+        spin_unlock(&cp->lock);
+}
+
+static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff **pskb,
+                                  struct ip_vs_app *app)
+{
+        int diff;
+        unsigned int tcp_offset = (*pskb)->nh.iph->ihl*4;
+        struct tcphdr *th;
+        __u32 seq;
+
+        if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+                return 0;
+
+        th = (struct tcphdr *)((*pskb)->nh.raw + tcp_offset);
+
+        /*
+         *      Remember seq number in case this pkt gets resized
+         */
+        seq = ntohl(th->seq);
+
+        /*
+         *      Fix seq stuff if flagged as so.
+         */
+        if (cp->flags & IP_VS_CONN_F_OUT_SEQ)
+                vs_fix_seq(&cp->out_seq, th);
+        if (cp->flags & IP_VS_CONN_F_IN_SEQ)
+                vs_fix_ack_seq(&cp->in_seq, th);
+
+        /*
+         *      Call private output hook function
+         */
+        if (app->pkt_out == NULL)
+                return 1;
+
+        if (!app->pkt_out(app, cp, pskb, &diff))
+                return 0;
+
+        /*
+         *      Update ip_vs seq stuff if len has changed.
+         */
+        if (diff != 0)
+                vs_seq_update(cp, &cp->out_seq,
+                              IP_VS_CONN_F_OUT_SEQ, seq, diff);
+
+        return 1;
+}
+
+/*
+ *      Output pkt hook. Will call bound ip_vs_app specific function
+ *      called by ipvs packet handler, assumes previously checked cp!=NULL
+ *      returns false if it can't handle packet (oom)
+ */
+int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff **pskb)
+{
+        struct ip_vs_app *app;
+
+        /*
+         *      check if application module is bound to
+         *      this ip_vs_conn.
+         */
+        if ((app = cp->app) == NULL)
+                return 1;
+
+        /* TCP is complicated */
+        if (cp->protocol == IPPROTO_TCP)
+                return app_tcp_pkt_out(cp, pskb, app);
+
+        /*
+         *      Call private output hook function
+         */
+        if (app->pkt_out == NULL)
+                return 1;
+
+        return app->pkt_out(app, cp, pskb, NULL);
+}
+
+
+static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff **pskb,
+                                 struct ip_vs_app *app)
+{
+        int diff;
+        unsigned int tcp_offset = (*pskb)->nh.iph->ihl*4;
+        struct tcphdr *th;
+        __u32 seq;
+
+        if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+                return 0;
+
+        th = (struct tcphdr *)((*pskb)->nh.raw + tcp_offset);
+
+        /*
+         *      Remember seq number in case this pkt gets resized
+         */
+        seq = ntohl(th->seq);
+
+        /*
+         *      Fix seq stuff if flagged as so.
+         */
+        if (cp->flags & IP_VS_CONN_F_IN_SEQ)
+                vs_fix_seq(&cp->in_seq, th);
+        if (cp->flags & IP_VS_CONN_F_OUT_SEQ)
+                vs_fix_ack_seq(&cp->out_seq, th);
+
+        /*
+         *      Call private input hook function
+         */
+        if (app->pkt_in == NULL)
+                return 1;
+
+        if (!app->pkt_in(app, cp, pskb, &diff))
+                return 0;
+
+        /*
+         *      Update ip_vs seq stuff if len has changed.
+         */
+        if (diff != 0)
+                vs_seq_update(cp, &cp->in_seq,
+                              IP_VS_CONN_F_IN_SEQ, seq, diff);
+
+        return 1;
+}
+
+/*
+ *      Input pkt hook. Will call bound ip_vs_app specific function
+ *      called by ipvs packet handler, assumes previously checked cp!=NULL.
+ *      returns false if can't handle packet (oom).
+ */
+int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff **pskb)
+{
+        struct ip_vs_app *app;
+
+        /*
+         *      check if application module is bound to
+         *      this ip_vs_conn.
+         */
+        if ((app = cp->app) == NULL)
+                return 1;
+
+        /* TCP is complicated */
+        if (cp->protocol == IPPROTO_TCP)
+                return app_tcp_pkt_in(cp, pskb, app);
+
+        /*
+         *      Call private input hook function
+         */
+        if (app->pkt_in == NULL)
+                return 1;
+
+        return app->pkt_in(app, cp, pskb, NULL);
+}
+
+
+#ifdef CONFIG_PROC_FS
+/*
+ *      /proc/net/ip_vs_app entry function
+ */
+
+static struct ip_vs_app *ip_vs_app_idx(loff_t pos)
+{
+        struct ip_vs_app *app, *inc;
+
+        list_for_each_entry(app, &ip_vs_app_list, a_list) {
+                list_for_each_entry(inc, &app->incs_list, a_list) {
+                        if (pos-- == 0)
+                                return inc;
+                }
+        }
+        return NULL;
+
+}
+
+static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        down(&__ip_vs_app_mutex);
+
+        return *pos ? ip_vs_app_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        struct ip_vs_app *inc, *app;
+        struct list_head *e;
+
+        ++*pos;
+        if (v == SEQ_START_TOKEN)
+                return ip_vs_app_idx(0);
+
+        inc = v;
+        app = inc->app;
+
+        if ((e = inc->a_list.next) != &app->incs_list)
+                return list_entry(e, struct ip_vs_app, a_list);
+
+        /* go on to next application */
+        for (e = app->a_list.next; e != &ip_vs_app_list; e = e->next) {
+                app = list_entry(e, struct ip_vs_app, a_list);
+                list_for_each_entry(inc, &app->incs_list, a_list) {
+                        return inc;
+                }
+        }
+        return NULL;
+}
+
+static void ip_vs_app_seq_stop(struct seq_file *seq, void *v)
+{
+        up(&__ip_vs_app_mutex);
+}
+
+static int ip_vs_app_seq_show(struct seq_file *seq, void *v)
+{
+        if (v == SEQ_START_TOKEN)
+                seq_puts(seq, "prot port    usecnt name\n");
+        else {
+                const struct ip_vs_app *inc = v;
+
+                seq_printf(seq, "%-3s  %-7u %-6d %-17s\n",
+                           ip_vs_proto_name(inc->protocol),
+                           ntohs(inc->port),
+                           atomic_read(&inc->usecnt),
+                           inc->name);
+        }
+        return 0;
+}
+
+static struct seq_operations ip_vs_app_seq_ops = {
+        .start = ip_vs_app_seq_start,
+        .next  = ip_vs_app_seq_next,
+        .stop  = ip_vs_app_seq_stop,
+        .show  = ip_vs_app_seq_show,
+};
+
+static int ip_vs_app_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &ip_vs_app_seq_ops);
+}
+
+static struct file_operations ip_vs_app_fops = {
+        .owner   = THIS_MODULE,
+        .open    = ip_vs_app_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = seq_release,
+};
+#endif
+
+
+/*
+ *      Replace a segment of data with a new segment
+ */
+int ip_vs_skb_replace(struct sk_buff *skb, int pri,
+                      char *o_buf, int o_len, char *n_buf, int n_len)
+{
+        struct iphdr *iph;
+        int diff;
+        int o_offset;
+        int o_left;
+
+        EnterFunction(9);
+
+        diff = n_len - o_len;
+        o_offset = o_buf - (char *)skb->data;
+        /* The length of left data after o_buf+o_len in the skb data */
+        o_left = skb->len - (o_offset + o_len);
+
+        if (diff <= 0) {
+                memmove(o_buf + n_len, o_buf + o_len, o_left);
+                memcpy(o_buf, n_buf, n_len);
+                skb_trim(skb, skb->len + diff);
+        } else if (diff <= skb_tailroom(skb)) {
+                skb_put(skb, diff);
+                memmove(o_buf + n_len, o_buf + o_len, o_left);
+                memcpy(o_buf, n_buf, n_len);
+        } else {
+                if (pskb_expand_head(skb, skb_headroom(skb), diff, pri))
+                        return -ENOMEM;
+                skb_put(skb, diff);
+                memmove(skb->data + o_offset + n_len,
+                        skb->data + o_offset + o_len, o_left);
+                memcpy(skb->data + o_offset, n_buf, n_len);
+        }
+
+        /* must update the iph total length here */
+        iph = skb->nh.iph;
+        iph->tot_len = htons(skb->len);
+
+        LeaveFunction(9);
+        return 0;
+}
+
+
+int ip_vs_app_init(void)
+{
+        /* we will replace it with proc_net_ipvs_create() soon */
+        proc_net_fops_create("ip_vs_app", 0, &ip_vs_app_fops);
+        return 0;
+}
+
+
+void ip_vs_app_cleanup(void)
+{
+        proc_net_remove("ip_vs_app");
+}