Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2013 Eric Leblond <eric@regit.org> |
| 4 | * |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 5 | * Development of this code partly funded by OISF |
| 6 | * (http://www.openinfosecfoundation.org/) |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/netlink.h> |
| 13 | #include <linux/jhash.h> |
| 14 | #include <linux/netfilter.h> |
| 15 | #include <linux/netfilter/nf_tables.h> |
| 16 | #include <net/netfilter/nf_tables.h> |
| 17 | #include <net/netfilter/nf_queue.h> |
| 18 | |
| 19 | static u32 jhash_initval __read_mostly; |
| 20 | |
| 21 | struct nft_queue { |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 22 | enum nft_registers sreg_qnum:8; |
| 23 | u16 queuenum; |
| 24 | u16 queues_total; |
| 25 | u16 flags; |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | static void nft_queue_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 29 | struct nft_regs *regs, |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 30 | const struct nft_pktinfo *pkt) |
| 31 | { |
| 32 | struct nft_queue *priv = nft_expr_priv(expr); |
| 33 | u32 queue = priv->queuenum; |
| 34 | u32 ret; |
| 35 | |
| 36 | if (priv->queues_total > 1) { |
| 37 | if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) { |
Pablo Neira Ayuso | c2e756f | 2016-12-11 20:46:51 +0100 | [diff] [blame] | 38 | int cpu = raw_smp_processor_id(); |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 39 | |
| 40 | queue = priv->queuenum + cpu % priv->queues_total; |
| 41 | } else { |
| 42 | queue = nfqueue_hash(pkt->skb, queue, |
Pablo Neira Ayuso | 0e5a1c7 | 2016-11-03 10:56:26 +0100 | [diff] [blame] | 43 | priv->queues_total, nft_pf(pkt), |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 44 | jhash_initval); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | ret = NF_QUEUE_NR(queue); |
| 49 | if (priv->flags & NFT_QUEUE_FLAG_BYPASS) |
| 50 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; |
| 51 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 52 | regs->verdict.code = ret; |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 53 | } |
| 54 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 55 | static void nft_queue_sreg_eval(const struct nft_expr *expr, |
| 56 | struct nft_regs *regs, |
| 57 | const struct nft_pktinfo *pkt) |
| 58 | { |
| 59 | struct nft_queue *priv = nft_expr_priv(expr); |
| 60 | u32 queue, ret; |
| 61 | |
| 62 | queue = regs->data[priv->sreg_qnum]; |
| 63 | |
| 64 | ret = NF_QUEUE_NR(queue); |
| 65 | if (priv->flags & NFT_QUEUE_FLAG_BYPASS) |
| 66 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; |
| 67 | |
| 68 | regs->verdict.code = ret; |
| 69 | } |
| 70 | |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 71 | static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = { |
| 72 | [NFTA_QUEUE_NUM] = { .type = NLA_U16 }, |
| 73 | [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 }, |
| 74 | [NFTA_QUEUE_FLAGS] = { .type = NLA_U16 }, |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 75 | [NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 }, |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 76 | }; |
| 77 | |
| 78 | static int nft_queue_init(const struct nft_ctx *ctx, |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 79 | const struct nft_expr *expr, |
| 80 | const struct nlattr * const tb[]) |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 81 | { |
| 82 | struct nft_queue *priv = nft_expr_priv(expr); |
Liping Zhang | fe01111 | 2016-09-06 22:33:37 +0800 | [diff] [blame] | 83 | u32 maxid; |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 84 | |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 85 | priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM])); |
| 86 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 87 | if (tb[NFTA_QUEUE_TOTAL]) |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 88 | priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL])); |
Liping Zhang | fe01111 | 2016-09-06 22:33:37 +0800 | [diff] [blame] | 89 | else |
| 90 | priv->queues_total = 1; |
| 91 | |
| 92 | if (priv->queues_total == 0) |
| 93 | return -EINVAL; |
| 94 | |
| 95 | maxid = priv->queues_total - 1 + priv->queuenum; |
| 96 | if (maxid > U16_MAX) |
| 97 | return -ERANGE; |
| 98 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 99 | if (tb[NFTA_QUEUE_FLAGS]) { |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 100 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); |
| 101 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) |
| 102 | return -EINVAL; |
| 103 | } |
| 104 | return 0; |
| 105 | } |
| 106 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 107 | static int nft_queue_sreg_init(const struct nft_ctx *ctx, |
| 108 | const struct nft_expr *expr, |
| 109 | const struct nlattr * const tb[]) |
| 110 | { |
| 111 | struct nft_queue *priv = nft_expr_priv(expr); |
| 112 | int err; |
| 113 | |
| 114 | priv->sreg_qnum = nft_parse_register(tb[NFTA_QUEUE_SREG_QNUM]); |
| 115 | err = nft_validate_register_load(priv->sreg_qnum, sizeof(u32)); |
| 116 | if (err < 0) |
| 117 | return err; |
| 118 | |
| 119 | if (tb[NFTA_QUEUE_FLAGS]) { |
| 120 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); |
| 121 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) |
| 122 | return -EINVAL; |
| 123 | if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) |
| 124 | return -EOPNOTSUPP; |
| 125 | } |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 130 | static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 131 | { |
| 132 | const struct nft_queue *priv = nft_expr_priv(expr); |
| 133 | |
| 134 | if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) || |
| 135 | nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) || |
| 136 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) |
| 137 | goto nla_put_failure; |
| 138 | |
| 139 | return 0; |
| 140 | |
| 141 | nla_put_failure: |
| 142 | return -1; |
| 143 | } |
| 144 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 145 | static int |
| 146 | nft_queue_sreg_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 147 | { |
| 148 | const struct nft_queue *priv = nft_expr_priv(expr); |
| 149 | |
| 150 | if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) || |
| 151 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) |
| 152 | goto nla_put_failure; |
| 153 | |
| 154 | return 0; |
| 155 | |
| 156 | nla_put_failure: |
| 157 | return -1; |
| 158 | } |
| 159 | |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 160 | static struct nft_expr_type nft_queue_type; |
| 161 | static const struct nft_expr_ops nft_queue_ops = { |
| 162 | .type = &nft_queue_type, |
| 163 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), |
| 164 | .eval = nft_queue_eval, |
| 165 | .init = nft_queue_init, |
| 166 | .dump = nft_queue_dump, |
| 167 | }; |
| 168 | |
Liping Zhang | 8061bb5 | 2016-09-14 23:41:46 +0800 | [diff] [blame] | 169 | static const struct nft_expr_ops nft_queue_sreg_ops = { |
| 170 | .type = &nft_queue_type, |
| 171 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), |
| 172 | .eval = nft_queue_sreg_eval, |
| 173 | .init = nft_queue_sreg_init, |
| 174 | .dump = nft_queue_sreg_dump, |
| 175 | }; |
| 176 | |
| 177 | static const struct nft_expr_ops * |
| 178 | nft_queue_select_ops(const struct nft_ctx *ctx, |
| 179 | const struct nlattr * const tb[]) |
| 180 | { |
| 181 | if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM]) |
| 182 | return ERR_PTR(-EINVAL); |
| 183 | |
| 184 | init_hashrandom(&jhash_initval); |
| 185 | |
| 186 | if (tb[NFTA_QUEUE_NUM]) |
| 187 | return &nft_queue_ops; |
| 188 | |
| 189 | if (tb[NFTA_QUEUE_SREG_QNUM]) |
| 190 | return &nft_queue_sreg_ops; |
| 191 | |
| 192 | return ERR_PTR(-EINVAL); |
| 193 | } |
| 194 | |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 195 | static struct nft_expr_type nft_queue_type __read_mostly = { |
| 196 | .name = "queue", |
Arushi Singhal | d4ef383 | 2017-04-02 14:52:12 +0530 | [diff] [blame] | 197 | .select_ops = nft_queue_select_ops, |
Eric Leblond | 0aff078 | 2013-12-06 00:24:13 +0100 | [diff] [blame] | 198 | .policy = nft_queue_policy, |
| 199 | .maxattr = NFTA_QUEUE_MAX, |
| 200 | .owner = THIS_MODULE, |
| 201 | }; |
| 202 | |
| 203 | static int __init nft_queue_module_init(void) |
| 204 | { |
| 205 | return nft_register_expr(&nft_queue_type); |
| 206 | } |
| 207 | |
| 208 | static void __exit nft_queue_module_exit(void) |
| 209 | { |
| 210 | nft_unregister_expr(&nft_queue_type); |
| 211 | } |
| 212 | |
| 213 | module_init(nft_queue_module_init); |
| 214 | module_exit(nft_queue_module_exit); |
| 215 | |
| 216 | MODULE_LICENSE("GPL"); |
| 217 | MODULE_AUTHOR("Eric Leblond <eric@regit.org>"); |
| 218 | MODULE_ALIAS_NFT_EXPR("queue"); |