1da177e4c3
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!
277 lines
6.4 KiB
C
277 lines
6.4 KiB
C
/*
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* net/sched/mirred.c packet mirroring and redirect actions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim (2002-4)
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*
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* TODO: Add ingress support (and socket redirect support)
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*
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*/
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_mirred.h>
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#include <net/tc_act/tc_mirred.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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/* use generic hash table */
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#define MY_TAB_SIZE 8
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#define MY_TAB_MASK (MY_TAB_SIZE - 1)
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static u32 idx_gen;
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static struct tcf_mirred *tcf_mirred_ht[MY_TAB_SIZE];
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static DEFINE_RWLOCK(mirred_lock);
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/* ovewrride the defaults */
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#define tcf_st tcf_mirred
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#define tc_st tc_mirred
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#define tcf_t_lock mirred_lock
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#define tcf_ht tcf_mirred_ht
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#define CONFIG_NET_ACT_INIT 1
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#include <net/pkt_act.h>
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static inline int
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tcf_mirred_release(struct tcf_mirred *p, int bind)
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{
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if (p) {
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if (bind)
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p->bindcnt--;
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p->refcnt--;
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if(!p->bindcnt && p->refcnt <= 0) {
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dev_put(p->dev);
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tcf_hash_destroy(p);
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return 1;
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}
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}
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return 0;
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}
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static int
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tcf_mirred_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
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int ovr, int bind)
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{
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struct rtattr *tb[TCA_MIRRED_MAX];
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struct tc_mirred *parm;
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struct tcf_mirred *p;
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struct net_device *dev = NULL;
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int ret = 0;
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int ok_push = 0;
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if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0)
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return -EINVAL;
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if (tb[TCA_MIRRED_PARMS-1] == NULL ||
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RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm))
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return -EINVAL;
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parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]);
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if (parm->ifindex) {
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dev = __dev_get_by_index(parm->ifindex);
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if (dev == NULL)
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return -ENODEV;
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switch (dev->type) {
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case ARPHRD_TUNNEL:
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case ARPHRD_TUNNEL6:
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case ARPHRD_SIT:
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case ARPHRD_IPGRE:
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case ARPHRD_VOID:
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case ARPHRD_NONE:
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ok_push = 0;
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break;
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default:
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ok_push = 1;
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break;
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}
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}
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p = tcf_hash_check(parm->index, a, ovr, bind);
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if (p == NULL) {
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if (!parm->ifindex)
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return -EINVAL;
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p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
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if (p == NULL)
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return -ENOMEM;
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ret = ACT_P_CREATED;
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} else {
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if (!ovr) {
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tcf_mirred_release(p, bind);
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return -EEXIST;
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}
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}
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spin_lock_bh(&p->lock);
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p->action = parm->action;
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p->eaction = parm->eaction;
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if (parm->ifindex) {
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p->ifindex = parm->ifindex;
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if (ret != ACT_P_CREATED)
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dev_put(p->dev);
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p->dev = dev;
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dev_hold(dev);
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p->ok_push = ok_push;
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}
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spin_unlock_bh(&p->lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(p);
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DPRINTK("tcf_mirred_init index %d action %d eaction %d device %s "
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"ifindex %d\n", parm->index, parm->action, parm->eaction,
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dev->name, parm->ifindex);
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return ret;
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}
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static int
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tcf_mirred_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_mirred *p = PRIV(a, mirred);
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if (p != NULL)
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return tcf_mirred_release(p, bind);
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return 0;
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}
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static int
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tcf_mirred(struct sk_buff **pskb, struct tc_action *a)
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{
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struct tcf_mirred *p = PRIV(a, mirred);
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struct net_device *dev;
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struct sk_buff *skb2 = NULL;
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struct sk_buff *skb = *pskb;
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u32 at = G_TC_AT(skb->tc_verd);
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spin_lock(&p->lock);
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dev = p->dev;
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p->tm.lastuse = jiffies;
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if (!(dev->flags&IFF_UP) ) {
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if (net_ratelimit())
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printk("mirred to Houston: device %s is gone!\n",
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dev->name);
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bad_mirred:
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if (skb2 != NULL)
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kfree_skb(skb2);
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p->qstats.overlimits++;
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p->bstats.bytes += skb->len;
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p->bstats.packets++;
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spin_unlock(&p->lock);
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/* should we be asking for packet to be dropped?
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* may make sense for redirect case only
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*/
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return TC_ACT_SHOT;
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}
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2 == NULL)
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goto bad_mirred;
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if (p->eaction != TCA_EGRESS_MIRROR && p->eaction != TCA_EGRESS_REDIR) {
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if (net_ratelimit())
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printk("tcf_mirred unknown action %d\n", p->eaction);
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goto bad_mirred;
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}
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p->bstats.bytes += skb2->len;
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p->bstats.packets++;
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if (!(at & AT_EGRESS))
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if (p->ok_push)
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skb_push(skb2, skb2->dev->hard_header_len);
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/* mirror is always swallowed */
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if (p->eaction != TCA_EGRESS_MIRROR)
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skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
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skb2->dev = dev;
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skb2->input_dev = skb->dev;
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dev_queue_xmit(skb2);
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spin_unlock(&p->lock);
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return p->action;
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}
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static int
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tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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unsigned char *b = skb->tail;
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struct tc_mirred opt;
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struct tcf_mirred *p = PRIV(a, mirred);
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struct tcf_t t;
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opt.index = p->index;
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opt.action = p->action;
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opt.refcnt = p->refcnt - ref;
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opt.bindcnt = p->bindcnt - bind;
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opt.eaction = p->eaction;
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opt.ifindex = p->ifindex;
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DPRINTK("tcf_mirred_dump index %d action %d eaction %d ifindex %d\n",
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p->index, p->action, p->eaction, p->ifindex);
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RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt);
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t.install = jiffies_to_clock_t(jiffies - p->tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
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t.expires = jiffies_to_clock_t(p->tm.expires);
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RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t);
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return skb->len;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static struct tc_action_ops act_mirred_ops = {
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.kind = "mirred",
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.type = TCA_ACT_MIRRED,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_mirred,
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.dump = tcf_mirred_dump,
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.cleanup = tcf_mirred_cleanup,
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.lookup = tcf_hash_search,
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.init = tcf_mirred_init,
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.walk = tcf_generic_walker
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002)");
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MODULE_DESCRIPTION("Device Mirror/redirect actions");
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MODULE_LICENSE("GPL");
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static int __init
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mirred_init_module(void)
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{
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printk("Mirror/redirect action on\n");
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return tcf_register_action(&act_mirred_ops);
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}
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static void __exit
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mirred_cleanup_module(void)
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{
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tcf_unregister_action(&act_mirred_ops);
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}
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module_init(mirred_init_module);
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module_exit(mirred_cleanup_module);
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