Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008, Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 16 | * |
| 17 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/skbuff.h> |
| 24 | #include <linux/rtnetlink.h> |
| 25 | #include <net/netlink.h> |
| 26 | #include <net/pkt_sched.h> |
| 27 | |
| 28 | #include <linux/tc_act/tc_skbedit.h> |
| 29 | #include <net/tc_act/tc_skbedit.h> |
| 30 | |
| 31 | #define SKBEDIT_TAB_MASK 15 |
| 32 | static struct tcf_common *tcf_skbedit_ht[SKBEDIT_TAB_MASK + 1]; |
| 33 | static u32 skbedit_idx_gen; |
| 34 | static DEFINE_RWLOCK(skbedit_lock); |
| 35 | |
| 36 | static struct tcf_hashinfo skbedit_hash_info = { |
| 37 | .htab = tcf_skbedit_ht, |
| 38 | .hmask = SKBEDIT_TAB_MASK, |
| 39 | .lock = &skbedit_lock, |
| 40 | }; |
| 41 | |
| 42 | static int tcf_skbedit(struct sk_buff *skb, struct tc_action *a, |
| 43 | struct tcf_result *res) |
| 44 | { |
| 45 | struct tcf_skbedit *d = a->priv; |
| 46 | |
| 47 | spin_lock(&d->tcf_lock); |
| 48 | d->tcf_tm.lastuse = jiffies; |
| 49 | d->tcf_bstats.bytes += qdisc_pkt_len(skb); |
| 50 | d->tcf_bstats.packets++; |
| 51 | |
| 52 | if (d->flags & SKBEDIT_F_PRIORITY) |
| 53 | skb->priority = d->priority; |
| 54 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING && |
| 55 | skb->dev->real_num_tx_queues > d->queue_mapping) |
| 56 | skb_set_queue_mapping(skb, d->queue_mapping); |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 57 | if (d->flags & SKBEDIT_F_MARK) |
| 58 | skb->mark = d->mark; |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 59 | |
| 60 | spin_unlock(&d->tcf_lock); |
| 61 | return d->tcf_action; |
| 62 | } |
| 63 | |
| 64 | static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { |
| 65 | [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, |
| 66 | [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, |
| 67 | [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 68 | [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
| 71 | static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est, |
| 72 | struct tc_action *a, int ovr, int bind) |
| 73 | { |
| 74 | struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; |
| 75 | struct tc_skbedit *parm; |
| 76 | struct tcf_skbedit *d; |
| 77 | struct tcf_common *pc; |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 78 | u32 flags = 0, *priority = NULL, *mark = NULL; |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 79 | u16 *queue_mapping = NULL; |
| 80 | int ret = 0, err; |
| 81 | |
| 82 | if (nla == NULL) |
| 83 | return -EINVAL; |
| 84 | |
| 85 | err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); |
| 86 | if (err < 0) |
| 87 | return err; |
| 88 | |
| 89 | if (tb[TCA_SKBEDIT_PARMS] == NULL) |
| 90 | return -EINVAL; |
| 91 | |
| 92 | if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { |
| 93 | flags |= SKBEDIT_F_PRIORITY; |
| 94 | priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); |
| 95 | } |
| 96 | |
| 97 | if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { |
| 98 | flags |= SKBEDIT_F_QUEUE_MAPPING; |
| 99 | queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); |
| 100 | } |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 101 | |
| 102 | if (tb[TCA_SKBEDIT_MARK] != NULL) { |
| 103 | flags |= SKBEDIT_F_MARK; |
| 104 | mark = nla_data(tb[TCA_SKBEDIT_MARK]); |
| 105 | } |
| 106 | |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 107 | if (!flags) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | parm = nla_data(tb[TCA_SKBEDIT_PARMS]); |
| 111 | |
| 112 | pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info); |
| 113 | if (!pc) { |
| 114 | pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, |
| 115 | &skbedit_idx_gen, &skbedit_hash_info); |
Stephen Hemminger | 0e991ec | 2008-11-25 21:12:32 -0800 | [diff] [blame] | 116 | if (IS_ERR(pc)) |
| 117 | return PTR_ERR(pc); |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 118 | |
| 119 | d = to_skbedit(pc); |
| 120 | ret = ACT_P_CREATED; |
| 121 | } else { |
| 122 | d = to_skbedit(pc); |
| 123 | if (!ovr) { |
| 124 | tcf_hash_release(pc, bind, &skbedit_hash_info); |
| 125 | return -EEXIST; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | spin_lock_bh(&d->tcf_lock); |
| 130 | |
| 131 | d->flags = flags; |
| 132 | if (flags & SKBEDIT_F_PRIORITY) |
| 133 | d->priority = *priority; |
| 134 | if (flags & SKBEDIT_F_QUEUE_MAPPING) |
| 135 | d->queue_mapping = *queue_mapping; |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 136 | if (flags & SKBEDIT_F_MARK) |
| 137 | d->mark = *mark; |
| 138 | |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 139 | d->tcf_action = parm->action; |
| 140 | |
| 141 | spin_unlock_bh(&d->tcf_lock); |
| 142 | |
| 143 | if (ret == ACT_P_CREATED) |
| 144 | tcf_hash_insert(pc, &skbedit_hash_info); |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | static inline int tcf_skbedit_cleanup(struct tc_action *a, int bind) |
| 149 | { |
| 150 | struct tcf_skbedit *d = a->priv; |
| 151 | |
| 152 | if (d) |
| 153 | return tcf_hash_release(&d->common, bind, &skbedit_hash_info); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static inline int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, |
| 158 | int bind, int ref) |
| 159 | { |
| 160 | unsigned char *b = skb_tail_pointer(skb); |
| 161 | struct tcf_skbedit *d = a->priv; |
Eric Dumazet | 1c40be1 | 2010-08-16 20:04:22 +0000 | [diff] [blame^] | 162 | struct tc_skbedit opt = { |
| 163 | .index = d->tcf_index, |
| 164 | .refcnt = d->tcf_refcnt - ref, |
| 165 | .bindcnt = d->tcf_bindcnt - bind, |
| 166 | .action = d->tcf_action, |
| 167 | }; |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 168 | struct tcf_t t; |
| 169 | |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 170 | NLA_PUT(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt); |
| 171 | if (d->flags & SKBEDIT_F_PRIORITY) |
| 172 | NLA_PUT(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), |
| 173 | &d->priority); |
| 174 | if (d->flags & SKBEDIT_F_QUEUE_MAPPING) |
| 175 | NLA_PUT(skb, TCA_SKBEDIT_QUEUE_MAPPING, |
| 176 | sizeof(d->queue_mapping), &d->queue_mapping); |
jamal | 1c55d62 | 2009-10-15 03:09:18 +0000 | [diff] [blame] | 177 | if (d->flags & SKBEDIT_F_MARK) |
| 178 | NLA_PUT(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), |
| 179 | &d->mark); |
Alexander Duyck | ca9b0e2 | 2008-09-12 16:30:20 -0700 | [diff] [blame] | 180 | t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); |
| 181 | t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); |
| 182 | t.expires = jiffies_to_clock_t(d->tcf_tm.expires); |
| 183 | NLA_PUT(skb, TCA_SKBEDIT_TM, sizeof(t), &t); |
| 184 | return skb->len; |
| 185 | |
| 186 | nla_put_failure: |
| 187 | nlmsg_trim(skb, b); |
| 188 | return -1; |
| 189 | } |
| 190 | |
| 191 | static struct tc_action_ops act_skbedit_ops = { |
| 192 | .kind = "skbedit", |
| 193 | .hinfo = &skbedit_hash_info, |
| 194 | .type = TCA_ACT_SKBEDIT, |
| 195 | .capab = TCA_CAP_NONE, |
| 196 | .owner = THIS_MODULE, |
| 197 | .act = tcf_skbedit, |
| 198 | .dump = tcf_skbedit_dump, |
| 199 | .cleanup = tcf_skbedit_cleanup, |
| 200 | .init = tcf_skbedit_init, |
| 201 | .walk = tcf_generic_walker, |
| 202 | }; |
| 203 | |
| 204 | MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); |
| 205 | MODULE_DESCRIPTION("SKB Editing"); |
| 206 | MODULE_LICENSE("GPL"); |
| 207 | |
| 208 | static int __init skbedit_init_module(void) |
| 209 | { |
| 210 | return tcf_register_action(&act_skbedit_ops); |
| 211 | } |
| 212 | |
| 213 | static void __exit skbedit_cleanup_module(void) |
| 214 | { |
| 215 | tcf_unregister_action(&act_skbedit_ops); |
| 216 | } |
| 217 | |
| 218 | module_init(skbedit_init_module); |
| 219 | module_exit(skbedit_cleanup_module); |