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, see <http://www.gnu.org/licenses/>. 15 * 16 * Author: Alexander Duyck <alexander.h.duyck@intel.com> 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/skbuff.h> 23 #include <linux/rtnetlink.h> 24 #include <net/netlink.h> 25 #include <net/pkt_sched.h> 26 27 #include <linux/tc_act/tc_skbedit.h> 28 #include <net/tc_act/tc_skbedit.h> 29 30 #define SKBEDIT_TAB_MASK 15 31 static struct tcf_hashinfo skbedit_hash_info; 32 33 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a, 34 struct tcf_result *res) 35 { 36 struct tcf_skbedit *d = a->priv; 37 38 spin_lock(&d->tcf_lock); 39 d->tcf_tm.lastuse = jiffies; 40 bstats_update(&d->tcf_bstats, skb); 41 42 if (d->flags & SKBEDIT_F_PRIORITY) 43 skb->priority = d->priority; 44 if (d->flags & SKBEDIT_F_QUEUE_MAPPING && 45 skb->dev->real_num_tx_queues > d->queue_mapping) 46 skb_set_queue_mapping(skb, d->queue_mapping); 47 if (d->flags & SKBEDIT_F_MARK) 48 skb->mark = d->mark; 49 50 spin_unlock(&d->tcf_lock); 51 return d->tcf_action; 52 } 53 54 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 55 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 56 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 57 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 58 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 59 }; 60 61 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 62 struct nlattr *est, struct tc_action *a, 63 int ovr, int bind) 64 { 65 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 66 struct tc_skbedit *parm; 67 struct tcf_skbedit *d; 68 struct tcf_common *pc; 69 u32 flags = 0, *priority = NULL, *mark = NULL; 70 u16 *queue_mapping = NULL; 71 int ret = 0, err; 72 73 if (nla == NULL) 74 return -EINVAL; 75 76 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy); 77 if (err < 0) 78 return err; 79 80 if (tb[TCA_SKBEDIT_PARMS] == NULL) 81 return -EINVAL; 82 83 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 84 flags |= SKBEDIT_F_PRIORITY; 85 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 86 } 87 88 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 89 flags |= SKBEDIT_F_QUEUE_MAPPING; 90 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 91 } 92 93 if (tb[TCA_SKBEDIT_MARK] != NULL) { 94 flags |= SKBEDIT_F_MARK; 95 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 96 } 97 98 if (!flags) 99 return -EINVAL; 100 101 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 102 103 pc = tcf_hash_check(parm->index, a, bind); 104 if (!pc) { 105 pc = tcf_hash_create(parm->index, est, a, sizeof(*d), bind); 106 if (IS_ERR(pc)) 107 return PTR_ERR(pc); 108 109 d = to_skbedit(pc); 110 ret = ACT_P_CREATED; 111 } else { 112 d = to_skbedit(pc); 113 if (bind) 114 return 0; 115 tcf_hash_release(pc, bind, a->ops->hinfo); 116 if (!ovr) 117 return -EEXIST; 118 } 119 120 spin_lock_bh(&d->tcf_lock); 121 122 d->flags = flags; 123 if (flags & SKBEDIT_F_PRIORITY) 124 d->priority = *priority; 125 if (flags & SKBEDIT_F_QUEUE_MAPPING) 126 d->queue_mapping = *queue_mapping; 127 if (flags & SKBEDIT_F_MARK) 128 d->mark = *mark; 129 130 d->tcf_action = parm->action; 131 132 spin_unlock_bh(&d->tcf_lock); 133 134 if (ret == ACT_P_CREATED) 135 tcf_hash_insert(pc, a->ops->hinfo); 136 return ret; 137 } 138 139 static int tcf_skbedit_cleanup(struct tc_action *a, int bind) 140 { 141 struct tcf_skbedit *d = a->priv; 142 143 if (d) 144 return tcf_hash_release(&d->common, bind, &skbedit_hash_info); 145 return 0; 146 } 147 148 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 149 int bind, int ref) 150 { 151 unsigned char *b = skb_tail_pointer(skb); 152 struct tcf_skbedit *d = a->priv; 153 struct tc_skbedit opt = { 154 .index = d->tcf_index, 155 .refcnt = d->tcf_refcnt - ref, 156 .bindcnt = d->tcf_bindcnt - bind, 157 .action = d->tcf_action, 158 }; 159 struct tcf_t t; 160 161 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 162 goto nla_put_failure; 163 if ((d->flags & SKBEDIT_F_PRIORITY) && 164 nla_put(skb, TCA_SKBEDIT_PRIORITY, sizeof(d->priority), 165 &d->priority)) 166 goto nla_put_failure; 167 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && 168 nla_put(skb, TCA_SKBEDIT_QUEUE_MAPPING, 169 sizeof(d->queue_mapping), &d->queue_mapping)) 170 goto nla_put_failure; 171 if ((d->flags & SKBEDIT_F_MARK) && 172 nla_put(skb, TCA_SKBEDIT_MARK, sizeof(d->mark), 173 &d->mark)) 174 goto nla_put_failure; 175 t.install = jiffies_to_clock_t(jiffies - d->tcf_tm.install); 176 t.lastuse = jiffies_to_clock_t(jiffies - d->tcf_tm.lastuse); 177 t.expires = jiffies_to_clock_t(d->tcf_tm.expires); 178 if (nla_put(skb, TCA_SKBEDIT_TM, sizeof(t), &t)) 179 goto nla_put_failure; 180 return skb->len; 181 182 nla_put_failure: 183 nlmsg_trim(skb, b); 184 return -1; 185 } 186 187 static struct tc_action_ops act_skbedit_ops = { 188 .kind = "skbedit", 189 .hinfo = &skbedit_hash_info, 190 .type = TCA_ACT_SKBEDIT, 191 .owner = THIS_MODULE, 192 .act = tcf_skbedit, 193 .dump = tcf_skbedit_dump, 194 .cleanup = tcf_skbedit_cleanup, 195 .init = tcf_skbedit_init, 196 }; 197 198 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 199 MODULE_DESCRIPTION("SKB Editing"); 200 MODULE_LICENSE("GPL"); 201 202 static int __init skbedit_init_module(void) 203 { 204 int err = tcf_hashinfo_init(&skbedit_hash_info, SKBEDIT_TAB_MASK); 205 if (err) 206 return err; 207 return tcf_register_action(&act_skbedit_ops); 208 } 209 210 static void __exit skbedit_cleanup_module(void) 211 { 212 tcf_hashinfo_destroy(&skbedit_hash_info); 213 tcf_unregister_action(&act_skbedit_ops); 214 } 215 216 module_init(skbedit_init_module); 217 module_exit(skbedit_cleanup_module); 218