| /* |
| * 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 *skb, struct tc_action *a, struct tcf_result *res) |
| { |
| struct tcf_pedit *p = PRIV(a, pedit); |
| 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); |
| |