diff options
Diffstat (limited to 'net/sched/pedit.c')
| -rw-r--r-- | net/sched/pedit.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/net/sched/pedit.c b/net/sched/pedit.c new file mode 100644 index 00000000000..678be6a645f --- /dev/null +++ b/net/sched/pedit.c @@ -0,0 +1,288 @@ +/* + * net/sched/pedit.c Generic packet editor + * + * 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) + */ + +#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_pedit.h> +#include <net/tc_act/tc_pedit.h> + + +#define PEDIT_DEB 1 + +/* use generic hash table */ +#define MY_TAB_SIZE 16 +#define MY_TAB_MASK 15 +static u32 idx_gen; +static struct tcf_pedit *tcf_pedit_ht[MY_TAB_SIZE]; +static DEFINE_RWLOCK(pedit_lock); + +#define tcf_st tcf_pedit +#define tc_st tc_pedit +#define tcf_t_lock pedit_lock +#define tcf_ht tcf_pedit_ht + +#define CONFIG_NET_ACT_INIT 1 +#include <net/pkt_act.h> + +static int +tcf_pedit_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a, + int ovr, int bind) +{ + struct rtattr *tb[TCA_PEDIT_MAX]; + struct tc_pedit *parm; + int ret = 0; + struct tcf_pedit *p; + struct tc_pedit_key *keys = NULL; + int ksize; + + if (rta == NULL || rtattr_parse_nested(tb, TCA_PEDIT_MAX, rta) < 0) + return -EINVAL; + + if (tb[TCA_PEDIT_PARMS - 1] == NULL || + RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm)) + return -EINVAL; + parm = RTA_DATA(tb[TCA_PEDIT_PARMS-1]); + ksize = parm->nkeys * sizeof(struct tc_pedit_key); + if (RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm) + ksize) + return -EINVAL; + + p = tcf_hash_check(parm->index, a, ovr, bind); + if (p == NULL) { + if (!parm->nkeys) + return -EINVAL; + p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind); + if (p == NULL) + return -ENOMEM; + keys = kmalloc(ksize, GFP_KERNEL); + if (keys == NULL) { + kfree(p); + return -ENOMEM; + } + ret = ACT_P_CREATED; + } else { + if (!ovr) { + tcf_hash_release(p, bind); + return -EEXIST; + } + if (p->nkeys && p->nkeys != parm->nkeys) { + keys = kmalloc(ksize, GFP_KERNEL); + if (keys == NULL) + return -ENOMEM; + } + } + + spin_lock_bh(&p->lock); + p->flags = parm->flags; + p->action = parm->action; + if (keys) { + kfree(p->keys); + p->keys = keys; + p->nkeys = parm->nkeys; + } + memcpy(p->keys, parm->keys, ksize); + spin_unlock_bh(&p->lock); + if (ret == ACT_P_CREATED) + tcf_hash_insert(p); + return ret; +} + +static int +tcf_pedit_cleanup(struct tc_action *a, int bind) +{ + struct tcf_pedit *p = PRIV(a, pedit); + + if (p != NULL) { + struct tc_pedit_key *keys = p->keys; + if (tcf_hash_release(p, bind)) { + kfree(keys); + return 1; + } + } + return 0; +} + +static int +tcf_pedit(struct sk_buff **pskb, struct tc_action *a) +{ + struct tcf_pedit *p = PRIV(a, pedit); + struct sk_buff *skb = *pskb; + int i, munged = 0; + u8 *pptr; + + if (!(skb->tc_verd & TC_OK2MUNGE)) { + /* should we set skb->cloned? */ + if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) { + return p->action; + } + } + + pptr = skb->nh.raw; + + spin_lock(&p->lock); + + p->tm.lastuse = jiffies; + + if (p->nkeys > 0) { + struct tc_pedit_key *tkey = p->keys; + + for (i = p->nkeys; i > 0; i--, tkey++) { + u32 *ptr; + int offset = tkey->off; + + if (tkey->offmask) { + if (skb->len > tkey->at) { + char *j = pptr + tkey->at; + offset += ((*j & tkey->offmask) >> + tkey->shift); + } else { + goto bad; + } + } + + if (offset % 4) { + printk("offset must be on 32 bit boundaries\n"); + goto bad; + } + if (skb->len < 0 || (offset > 0 && offset > skb->len)) { + printk("offset %d cant exceed pkt length %d\n", + offset, skb->len); + goto bad; + } + + ptr = (u32 *)(pptr+offset); + /* just do it, baby */ + *ptr = ((*ptr & tkey->mask) ^ tkey->val); + munged++; + } + + if (munged) + skb->tc_verd = SET_TC_MUNGED(skb->tc_verd); + goto done; + } else { + printk("pedit BUG: index %d\n",p->index); + } + +bad: + p->qstats.overlimits++; +done: + p->bstats.bytes += skb->len; + p->bstats.packets++; + spin_unlock(&p->lock); + return p->action; +} + +static int +tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,int bind, int ref) +{ + unsigned char *b = skb->tail; + struct tc_pedit *opt; + struct tcf_pedit *p = PRIV(a, pedit); + struct tcf_t t; + int s; + + s = sizeof(*opt) + p->nkeys * sizeof(struct tc_pedit_key); + + /* netlink spinlocks held above us - must use ATOMIC */ + opt = kmalloc(s, GFP_ATOMIC); + if (opt == NULL) + return -ENOBUFS; + memset(opt, 0, s); + + memcpy(opt->keys, p->keys, p->nkeys * sizeof(struct tc_pedit_key)); + opt->index = p->index; + opt->nkeys = p->nkeys; + opt->flags = p->flags; + opt->action = p->action; + opt->refcnt = p->refcnt - ref; + opt->bindcnt = p->bindcnt - bind; + + +#ifdef PEDIT_DEB + { + /* Debug - get rid of later */ + int i; + struct tc_pedit_key *key = opt->keys; + + for (i=0; i<opt->nkeys; i++, key++) { + printk( "\n key #%d",i); + printk( " at %d: val %08x mask %08x", + (unsigned int)key->off, + (unsigned int)key->val, + (unsigned int)key->mask); + } + } +#endif + + RTA_PUT(skb, TCA_PEDIT_PARMS, s, 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_PEDIT_TM, sizeof(t), &t); + return skb->len; + +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static +struct tc_action_ops act_pedit_ops = { + .kind = "pedit", + .type = TCA_ACT_PEDIT, + .capab = TCA_CAP_NONE, + .owner = THIS_MODULE, + .act = tcf_pedit, + .dump = tcf_pedit_dump, + .cleanup = tcf_pedit_cleanup, + .lookup = tcf_hash_search, + .init = tcf_pedit_init, + .walk = tcf_generic_walker +}; + +MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); +MODULE_DESCRIPTION("Generic Packet Editor actions"); +MODULE_LICENSE("GPL"); + +static int __init +pedit_init_module(void) +{ + return tcf_register_action(&act_pedit_ops); +} + +static void __exit +pedit_cleanup_module(void) +{ + tcf_unregister_action(&act_pedit_ops); +} + +module_init(pedit_init_module); +module_exit(pedit_cleanup_module); + |