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, const 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 bstats_update(&d->tcf_bstats, skb); 50 51 if (d->flags & SKBEDIT_F_PRIORITY) 52 skb->priority = d->priority; 53 if (d->flags & SKBEDIT_F_QUEUE_MAPPING && 54 skb->dev->real_num_tx_queues > d->queue_mapping) 55 skb_set_queue_mapping(skb, d->queue_mapping); 56 if (d->flags & SKBEDIT_F_MARK) 57 skb->mark = d->mark; 58 59 spin_unlock(&d->tcf_lock); 60 return d->tcf_action; 61 } 62 63 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 64 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 65 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 66 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 67 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 68 }; 69 70 static int tcf_skbedit_init(struct nlattr *nla, struct nlattr *est, 71 struct tc_action *a, int ovr, int bind) 72 { 73 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 74 struct tc_skbedit *parm; 75 struct tcf_skbedit *d; 76 struct tcf_common *pc; 77 u32 flags = 0, *priority = NULL, *mark = NULL; 78 u16 *queue_mapping = NULL; 79 int ret = 0, err; 80 81 if (nla == NULL) 82 return -EINVAL; 83 84 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); 85 if (err < 0) 86 return err; 87 88 if (tb[TCA_SKBEDIT_PARMS] == NULL) 89 return -EINVAL; 90 91 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 92 flags |= SKBEDIT_F_PRIORITY; 93 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 94 } 95 96 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 97 flags |= SKBEDIT_F_QUEUE_MAPPING; 98 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 99 } 100 101 if (tb[TCA_SKBEDIT_MARK] != NULL) { 102 flags |= SKBEDIT_F_MARK; 103 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 104 } 105 106 if (!flags) 107 return -EINVAL; 108 109 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 110 111 pc = tcf_hash_check(parm->index, a, bind, &skbedit_hash_info); 112 if (!pc) { 113 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind, 114 &skbedit_idx_gen, &skbedit_hash_info); 115 if (IS_ERR(pc)) 116 return PTR_ERR(pc); 117 118 d = to_skbedit(pc); 119 ret = ACT_P_CREATED; 120 } else { 121 d = to_skbedit(pc); 122 if (!ovr) { 123 tcf_hash_release(pc, bind, &skbedit_hash_info); 124 return -EEXIST; 125 } 126 } 127 128 spin_lock_bh(&d->tcf_lock); 129 130 d->flags = flags; 131 if (flags & SKBEDIT_F_PRIORITY) 132 d->priority = *priority; 133 if (flags & SKBEDIT_F_QUEUE_MAPPING) 134 d->queue_mapping = *queue_mapping; 135 if (flags & SKBEDIT_F_MARK) 136 d->mark = *mark; 137 138 d->tcf_action = parm->action; 139 140 spin_unlock_bh(&d->tcf_lock); 141 142 if (ret == ACT_P_CREATED) 143 tcf_hash_insert(pc, &skbedit_hash_info); 144 return ret; 145 } 146 147 static int tcf_skbedit_cleanup(struct tc_action *a, int bind) 148 { 149 struct tcf_skbedit *d = a->priv; 150 151 if (d) 152 return tcf_hash_release(&d->common, bind, &skbedit_hash_info); 153 return 0; 154 } 155 156 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 157 int bind, int ref) 158 { 159 unsigned char *b = skb_tail_pointer(skb); 160 struct tcf_skbedit *d = a->priv; 161 struct tc_skbedit opt = { 162 .index = d->tcf_index, 163 .refcnt = d->tcf_refcnt - ref, 164 .bindcnt = d->tcf_bindcnt - bind, 165 .action = d->tcf_action, 166 }; 167 struct tcf_t t; 168 169 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 170 goto nla_put_failure; 171 if ((d->flags & SKBEDIT_F_PRIORITY) && 172 nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), 173 &d->priority)) 174 goto nla_put_failure; 175 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && 176 nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING, 177 sizeof(d->queue_mapping), &d->queue_mapping)) 178 goto nla_put_failure; 179 if ((d->flags & SKBEDIT_F_MARK) && 180 nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), 181 &d->mark)) 182 goto nla_put_failure; 183 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); 184 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); 185 t.expires = jiffies_to_clock_t(d->tcf_tm.expires); 186 if (nla_put(skb, TCA_SKBEDIT_TM, sizeof(t), &t)) 187 goto nla_put_failure; 188 return skb->len; 189 190 nla_put_failure: 191 nlmsg_trim(skb, b); 192 return -1; 193 } 194 195 static struct tc_action_ops act_skbedit_ops = { 196 .kind = "skbedit", 197 .hinfo = &skbedit_hash_info, 198 .type = TCA_ACT_SKBEDIT, 199 .capab = TCA_CAP_NONE, 200 .owner = THIS_MODULE, 201 .act = tcf_skbedit, 202 .dump = tcf_skbedit_dump, 203 .cleanup = tcf_skbedit_cleanup, 204 .init = tcf_skbedit_init, 205 .walk = tcf_generic_walker, 206 }; 207 208 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 209 MODULE_DESCRIPTION("SKB Editing"); 210 MODULE_LICENSE("GPL"); 211 212 static int __init skbedit_init_module(void) 213 { 214 return tcf_register_action(&act_skbedit_ops); 215 } 216 217 static void __exit skbedit_cleanup_module(void) 218 { 219 tcf_unregister_action(&act_skbedit_ops); 220 } 221 222 module_init(skbedit_init_module); 223 module_exit(skbedit_cleanup_module); 224