| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (c) 2013 Eric Leblond <eric@regit.org> |
| 4 | * |
| 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 { |
| 22 | u8 sreg_qnum; |
| 23 | u16 queuenum; |
| 24 | u16 queues_total; |
| 25 | u16 flags; |
| 26 | }; |
| 27 | |
| 28 | static void nft_queue_eval(const struct nft_expr *expr, |
| 29 | struct nft_regs *regs, |
| 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) { |
| 38 | int cpu = raw_smp_processor_id(); |
| 39 | |
| 40 | queue = priv->queuenum + cpu % priv->queues_total; |
| 41 | } else { |
| 42 | queue = nfqueue_hash(pkt->skb, queue, |
| 43 | priv->queues_total, nft_pf(pkt), |
| 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 | |
| 52 | regs->verdict.code = ret; |
| 53 | } |
| 54 | |
| 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 | |
| 71 | static int nft_queue_validate(const struct nft_ctx *ctx, |
| 72 | const struct nft_expr *expr, |
| 73 | const struct nft_data **data) |
| 74 | { |
| 75 | static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) | |
| 76 | (1 << NF_INET_LOCAL_IN) | |
| 77 | (1 << NF_INET_FORWARD) | |
| 78 | (1 << NF_INET_LOCAL_OUT) | |
| 79 | (1 << NF_INET_POST_ROUTING)); |
| 80 | |
| 81 | switch (ctx->family) { |
| 82 | case NFPROTO_IPV4: |
| 83 | case NFPROTO_IPV6: |
| 84 | case NFPROTO_INET: |
| 85 | case NFPROTO_BRIDGE: |
| 86 | break; |
| 87 | case NFPROTO_NETDEV: /* lacks okfn */ |
| 88 | fallthrough; |
| 89 | default: |
| 90 | return -EOPNOTSUPP; |
| 91 | } |
| 92 | |
| 93 | return nft_chain_validate_hooks(ctx->chain, supported_hooks); |
| 94 | } |
| 95 | |
| 96 | static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = { |
| 97 | [NFTA_QUEUE_NUM] = { .type = NLA_U16 }, |
| 98 | [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 }, |
| 99 | [NFTA_QUEUE_FLAGS] = { .type = NLA_U16 }, |
| 100 | [NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 }, |
| 101 | }; |
| 102 | |
| 103 | static int nft_queue_init(const struct nft_ctx *ctx, |
| 104 | const struct nft_expr *expr, |
| 105 | const struct nlattr * const tb[]) |
| 106 | { |
| 107 | struct nft_queue *priv = nft_expr_priv(expr); |
| 108 | u32 maxid; |
| 109 | |
| 110 | priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM])); |
| 111 | |
| 112 | if (tb[NFTA_QUEUE_TOTAL]) |
| 113 | priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL])); |
| 114 | else |
| 115 | priv->queues_total = 1; |
| 116 | |
| 117 | if (priv->queues_total == 0) |
| 118 | return -EINVAL; |
| 119 | |
| 120 | maxid = priv->queues_total - 1 + priv->queuenum; |
| 121 | if (maxid > U16_MAX) |
| 122 | return -ERANGE; |
| 123 | |
| 124 | if (tb[NFTA_QUEUE_FLAGS]) { |
| 125 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); |
| 126 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static int nft_queue_sreg_init(const struct nft_ctx *ctx, |
| 133 | const struct nft_expr *expr, |
| 134 | const struct nlattr * const tb[]) |
| 135 | { |
| 136 | struct nft_queue *priv = nft_expr_priv(expr); |
| 137 | int err; |
| 138 | |
| 139 | err = nft_parse_register_load(tb[NFTA_QUEUE_SREG_QNUM], |
| 140 | &priv->sreg_qnum, sizeof(u32)); |
| 141 | if (err < 0) |
| 142 | return err; |
| 143 | |
| 144 | if (tb[NFTA_QUEUE_FLAGS]) { |
| 145 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); |
| 146 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) |
| 147 | return -EINVAL; |
| 148 | if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) |
| 149 | return -EOPNOTSUPP; |
| 150 | } |
| 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static int nft_queue_dump(struct sk_buff *skb, |
| 156 | const struct nft_expr *expr, bool reset) |
| 157 | { |
| 158 | const struct nft_queue *priv = nft_expr_priv(expr); |
| 159 | |
| 160 | if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) || |
| 161 | nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) || |
| 162 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) |
| 163 | goto nla_put_failure; |
| 164 | |
| 165 | return 0; |
| 166 | |
| 167 | nla_put_failure: |
| 168 | return -1; |
| 169 | } |
| 170 | |
| 171 | static int |
| 172 | nft_queue_sreg_dump(struct sk_buff *skb, |
| 173 | const struct nft_expr *expr, bool reset) |
| 174 | { |
| 175 | const struct nft_queue *priv = nft_expr_priv(expr); |
| 176 | |
| 177 | if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) || |
| 178 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) |
| 179 | goto nla_put_failure; |
| 180 | |
| 181 | return 0; |
| 182 | |
| 183 | nla_put_failure: |
| 184 | return -1; |
| 185 | } |
| 186 | |
| 187 | static struct nft_expr_type nft_queue_type; |
| 188 | static const struct nft_expr_ops nft_queue_ops = { |
| 189 | .type = &nft_queue_type, |
| 190 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), |
| 191 | .eval = nft_queue_eval, |
| 192 | .init = nft_queue_init, |
| 193 | .dump = nft_queue_dump, |
| 194 | .validate = nft_queue_validate, |
| 195 | .reduce = NFT_REDUCE_READONLY, |
| 196 | }; |
| 197 | |
| 198 | static const struct nft_expr_ops nft_queue_sreg_ops = { |
| 199 | .type = &nft_queue_type, |
| 200 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), |
| 201 | .eval = nft_queue_sreg_eval, |
| 202 | .init = nft_queue_sreg_init, |
| 203 | .dump = nft_queue_sreg_dump, |
| 204 | .validate = nft_queue_validate, |
| 205 | .reduce = NFT_REDUCE_READONLY, |
| 206 | }; |
| 207 | |
| 208 | static const struct nft_expr_ops * |
| 209 | nft_queue_select_ops(const struct nft_ctx *ctx, |
| 210 | const struct nlattr * const tb[]) |
| 211 | { |
| 212 | if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM]) |
| 213 | return ERR_PTR(-EINVAL); |
| 214 | |
| 215 | init_hashrandom(&jhash_initval); |
| 216 | |
| 217 | if (tb[NFTA_QUEUE_NUM]) |
| 218 | return &nft_queue_ops; |
| 219 | |
| 220 | if (tb[NFTA_QUEUE_SREG_QNUM]) |
| 221 | return &nft_queue_sreg_ops; |
| 222 | |
| 223 | return ERR_PTR(-EINVAL); |
| 224 | } |
| 225 | |
| 226 | static struct nft_expr_type nft_queue_type __read_mostly = { |
| 227 | .name = "queue", |
| 228 | .select_ops = nft_queue_select_ops, |
| 229 | .policy = nft_queue_policy, |
| 230 | .maxattr = NFTA_QUEUE_MAX, |
| 231 | .owner = THIS_MODULE, |
| 232 | }; |
| 233 | |
| 234 | static int __init nft_queue_module_init(void) |
| 235 | { |
| 236 | return nft_register_expr(&nft_queue_type); |
| 237 | } |
| 238 | |
| 239 | static void __exit nft_queue_module_exit(void) |
| 240 | { |
| 241 | nft_unregister_expr(&nft_queue_type); |
| 242 | } |
| 243 | |
| 244 | module_init(nft_queue_module_init); |
| 245 | module_exit(nft_queue_module_exit); |
| 246 | |
| 247 | MODULE_LICENSE("GPL"); |
| 248 | MODULE_AUTHOR("Eric Leblond <eric@regit.org>"); |
| 249 | MODULE_ALIAS_NFT_EXPR("queue"); |
| 250 | MODULE_DESCRIPTION("Netfilter nftables queue module"); |