/* * Copyright (c) 2008, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. * * Author: Alexander Duyck <alexander.h.duyck@intel.com> */ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/skbuff.h> #include <linux/rtnetlink.h> #include <net/netlink.h> #include <net/pkt_sched.h> #include <linux/tc_act/tc_skbedit.h> #include <net/tc_act/tc_skbedit.h> #define SKBEDIT_TAB_MASK 15 static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1]; static u32 skbedit_idx_gen; static DEFINE_RWLOCK(skbedit_lock); static struct tcf_hashinfo skbedit_hash_info = { .htab = tcf_skbedit_ht, .hmask = SKBEDIT_TAB_MASK, .lock = &skbedit_lock, }; static int tcf_skbedit(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) { struct tcf_skbedit *d = a->priv; spin_lock(&d->tcf_lock); d->tcf_tm.lastuse = jiffies; d->tcf_bstats.bytes += qdisc_pkt_len(skb); d->tcf_bstats.packets++; if (d->flags & SKBEDIT_F_PRIORITY) skb->priority = d->priority; if (d->flags & SKBEDIT_F_QUEUE_MAPPING && skb->dev->real_num_tx_queues > d->queue_mapping) skb_set_queue_mapping(skb, d->queue_mapping); if (d->flags & SKBEDIT_F_MARK) skb->mark = d->mark; spin_unlock(&d->tcf_lock); return d->tcf_action; } static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, }; static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est, struct tc_action *a, int ovr, int bind) { struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; struct tc_skbedit *parm; struct tcf_skbedit *d; struct tcf_common *pc; u32 flags = 0, *priority = NULL, *mark = NULL; u16 *queue_mapping = NULL; int ret = 0, err; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); if (err < 0) return err; if (tb[TCA_SKBEDIT_PARMS] == NULL) return -EINVAL; if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { flags |= SKBEDIT_F_PRIORITY; priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); } if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { flags |= SKBEDIT_F_QUEUE_MAPPING; queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); } if (tb[TCA_SKBEDIT_MARK] != NULL) { flags |= SKBEDIT_F_MARK; mark = nla_data(tb[TCA_SKBEDIT_MARK]); } if (!flags) return -EINVAL; parm = nla_data(tb[TCA_SKBEDIT_PARMS]); pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info); if (!pc) { pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, &skbedit_idx_gen, &skbedit_hash_info); if (IS_ERR(pc)) return PTR_ERR(pc); d = to_skbedit(pc); ret = ACT_P_CREATED; } else { d = to_skbedit(pc); if (!ovr) { tcf_hash_release(pc, bind, &skbedit_hash_info); return -EEXIST; } } spin_lock_bh(&d->tcf_lock); d->flags = flags; if (flags & SKBEDIT_F_PRIORITY) d->priority = *priority; if (flags & SKBEDIT_F_QUEUE_MAPPING) d->queue_mapping = *queue_mapping; if (flags & SKBEDIT_F_MARK) d->mark = *mark; d->tcf_action = parm->action; spin_unlock_bh(&d->tcf_lock); if (ret == ACT_P_CREATED) tcf_hash_insert(pc, &skbedit_hash_info); return ret; } static inline int tcf_skbedit_cleanup(struct tc_action *a, int bind) { struct tcf_skbedit *d = a->priv; if (d) return tcf_hash_release(&d->common, bind, &skbedit_hash_info); return 0; } static inline int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { unsigned char *b = skb_tail_pointer(skb); struct tcf_skbedit *d = a->priv; struct tc_skbedit opt = { .index = d->tcf_index, .refcnt = d->tcf_refcnt - ref, .bindcnt = d->tcf_bindcnt - bind, .action = d->tcf_action, }; struct tcf_t t; NLA_PUT(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt); if (d->flags & SKBEDIT_F_PRIORITY) NLA_PUT(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), &d->priority); if (d->flags & SKBEDIT_F_QUEUE_MAPPING) NLA_PUT(skb, TCA_SKBEDIT_QUEUE_MAPPING, sizeof(d->queue_mapping), &d->queue_mapping); if (d->flags & SKBEDIT_F_MARK) NLA_PUT(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), &d->mark); t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); t.expires = jiffies_to_clock_t(d->tcf_tm.expires); NLA_PUT(skb, TCA_SKBEDIT_TM, sizeof(t), &t); return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; } static struct tc_action_ops act_skbedit_ops = { .kind = "skbedit", .hinfo = &skbedit_hash_info, .type = TCA_ACT_SKBEDIT, .capab = TCA_CAP_NONE, .owner = THIS_MODULE, .act = tcf_skbedit, .dump = tcf_skbedit_dump, .cleanup = tcf_skbedit_cleanup, .init = tcf_skbedit_init, .walk = tcf_generic_walker, }; MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); MODULE_DESCRIPTION("SKB Editing"); MODULE_LICENSE("GPL"); static int __init skbedit_init_module(void) { return tcf_register_action(&act_skbedit_ops); } static void __exit skbedit_cleanup_module(void) { tcf_unregister_action(&act_skbedit_ops); } module_init(skbedit_init_module); module_exit(skbedit_cleanup_module);