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, 276 insertions, 0 deletions

diff --git a/net/sched/mirred.c b/net/sched/mirred.c
new file mode 100644
index 000000000000..f309ce336803
--- /dev/null
+++ b/net/sched/mirred.c
@@ -0,0 +1,276 @@
+/*
+ * net/sched/mirred.c   packet mirroring and redirect actions
+ *
+ *              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.
+ *
+ * Authors:     Jamal Hadi Salim (2002-4)
+ *
+ * TODO: Add ingress support (and socket redirect support)
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_mirred.h>
+
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+
+
+/* use generic hash table */
+#define MY_TAB_SIZE     8
+#define MY_TAB_MASK     (MY_TAB_SIZE - 1)
+static u32 idx_gen;
+static struct tcf_mirred *tcf_mirred_ht[MY_TAB_SIZE];
+static DEFINE_RWLOCK(mirred_lock);
+
+/* ovewrride the defaults */
+#define tcf_st          tcf_mirred
+#define tc_st           tc_mirred
+#define tcf_t_lock      mirred_lock
+#define tcf_ht          tcf_mirred_ht
+
+#define CONFIG_NET_ACT_INIT 1
+#include <net/pkt_act.h>
+
+static inline int
+tcf_mirred_release(struct tcf_mirred *p, int bind)
+{
+        if (p) {
+                if (bind)
+                        p->bindcnt--;
+                p->refcnt--;
+                if(!p->bindcnt && p->refcnt <= 0) {
+                        dev_put(p->dev);
+                        tcf_hash_destroy(p);
+                        return 1;
+                }
+        }
+        return 0;
+}
+
+static int
+tcf_mirred_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
+                int ovr, int bind)
+{
+        struct rtattr *tb[TCA_MIRRED_MAX];
+        struct tc_mirred *parm;
+        struct tcf_mirred *p;
+        struct net_device *dev = NULL;
+        int ret = 0;
+        int ok_push = 0;
+
+        if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0)
+                return -EINVAL;
+
+        if (tb[TCA_MIRRED_PARMS-1] == NULL ||
+            RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm))
+                return -EINVAL;
+        parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]);
+
+        if (parm->ifindex) {
+                dev = __dev_get_by_index(parm->ifindex);
+                if (dev == NULL)
+                        return -ENODEV;
+                switch (dev->type) {
+                        case ARPHRD_TUNNEL:
+                        case ARPHRD_TUNNEL6:
+                        case ARPHRD_SIT:
+                        case ARPHRD_IPGRE:
+                        case ARPHRD_VOID:
+                        case ARPHRD_NONE:
+                                ok_push = 0;
+                                break;
+                        default:
+                                ok_push = 1;
+                                break;
+                }
+        }
+
+        p = tcf_hash_check(parm->index, a, ovr, bind);
+        if (p == NULL) {
+                if (!parm->ifindex)
+                        return -EINVAL;
+                p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
+                if (p == NULL)
+                        return -ENOMEM;
+                ret = ACT_P_CREATED;
+        } else {
+                if (!ovr) {
+                        tcf_mirred_release(p, bind);
+                        return -EEXIST;
+                }
+        }
+
+        spin_lock_bh(&p->lock);
+        p->action = parm->action;
+        p->eaction = parm->eaction;
+        if (parm->ifindex) {
+                p->ifindex = parm->ifindex;
+                if (ret != ACT_P_CREATED)
+                        dev_put(p->dev);
+                p->dev = dev;
+                dev_hold(dev);
+                p->ok_push = ok_push;
+        }
+        spin_unlock_bh(&p->lock);
+        if (ret == ACT_P_CREATED)
+                tcf_hash_insert(p);
+
+        DPRINTK("tcf_mirred_init index %d action %d eaction %d device %s "
+                "ifindex %d\n", parm->index, parm->action, parm->eaction,
+                dev->name, parm->ifindex);
+        return ret;
+}
+
+static int
+tcf_mirred_cleanup(struct tc_action *a, int bind)
+{
+        struct tcf_mirred *p = PRIV(a, mirred);
+
+        if (p != NULL)
+                return tcf_mirred_release(p, bind);
+        return 0;
+}
+
+static int
+tcf_mirred(struct sk_buff **pskb, struct tc_action *a)
+{
+        struct tcf_mirred *p = PRIV(a, mirred);
+        struct net_device *dev;
+        struct sk_buff *skb2 = NULL;
+        struct sk_buff *skb = *pskb;
+        u32 at = G_TC_AT(skb->tc_verd);
+
+        spin_lock(&p->lock);
+
+        dev = p->dev;
+        p->tm.lastuse = jiffies;
+
+        if (!(dev->flags&IFF_UP) ) {
+                if (net_ratelimit())
+                        printk("mirred to Houston: device %s is gone!\n",
+                               dev->name);
+bad_mirred:
+                if (skb2 != NULL)
+                        kfree_skb(skb2);
+                p->qstats.overlimits++;
+                p->bstats.bytes += skb->len;
+                p->bstats.packets++;
+                spin_unlock(&p->lock);
+                /* should we be asking for packet to be dropped?
+                 * may make sense for redirect case only
+                */
+                return TC_ACT_SHOT;
+        }
+
+        skb2 = skb_clone(skb, GFP_ATOMIC);
+        if (skb2 == NULL)
+                goto bad_mirred;
+        if (p->eaction != TCA_EGRESS_MIRROR && p->eaction != TCA_EGRESS_REDIR) {
+                if (net_ratelimit())
+                        printk("tcf_mirred unknown action %d\n", p->eaction);
+                goto bad_mirred;
+        }
+
+        p->bstats.bytes += skb2->len;
+        p->bstats.packets++;
+        if (!(at & AT_EGRESS))
+                if (p->ok_push)
+                        skb_push(skb2, skb2->dev->hard_header_len);
+
+        /* mirror is always swallowed */
+        if (p->eaction != TCA_EGRESS_MIRROR)
+                skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
+
+        skb2->dev = dev;
+        skb2->input_dev = skb->dev;
+        dev_queue_xmit(skb2);
+        spin_unlock(&p->lock);
+        return p->action;
+}
+
+static int
+tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+        unsigned char *b = skb->tail;
+        struct tc_mirred opt;
+        struct tcf_mirred *p = PRIV(a, mirred);
+        struct tcf_t t;
+
+        opt.index = p->index;
+        opt.action = p->action;
+        opt.refcnt = p->refcnt - ref;
+        opt.bindcnt = p->bindcnt - bind;
+        opt.eaction = p->eaction;
+        opt.ifindex = p->ifindex;
+        DPRINTK("tcf_mirred_dump index %d action %d eaction %d ifindex %d\n",
+                 p->index, p->action, p->eaction, p->ifindex);
+        RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
+        t.install = jiffies_to_clock_t(jiffies - p->tm.install);
+        t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
+        t.expires = jiffies_to_clock_t(p->tm.expires);
+        RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
+        return skb->len;
+
+      rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        return -1;
+}
+
+static struct tc_action_ops act_mirred_ops = {
+        .kind           =       "mirred",
+        .type           =       TCA_ACT_MIRRED,
+        .capab          =       TCA_CAP_NONE,
+        .owner          =       THIS_MODULE,
+        .act            =       tcf_mirred,
+        .dump           =       tcf_mirred_dump,
+        .cleanup        =       tcf_mirred_cleanup,
+        .lookup         =       tcf_hash_search,
+        .init           =       tcf_mirred_init,
+        .walk           =       tcf_generic_walker
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002)");
+MODULE_DESCRIPTION("Device Mirror/redirect actions");
+MODULE_LICENSE("GPL");
+
+static int __init
+mirred_init_module(void)
+{
+        printk("Mirror/redirect action on\n");
+        return tcf_register_action(&act_mirred_ops);
+}
+
+static void __exit
+mirred_cleanup_module(void)
+{
+        tcf_unregister_action(&act_mirred_ops);
+}
+
+module_init(mirred_init_module);
+module_exit(mirred_cleanup_module);