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![Phil Sutter](/assets/img/avatar_default.png)
Add a 'reset' flag just like with nft_object_ops::dump. This will be useful to reset "anonymous stateful objects", e.g. simple rule counters. No functional change intended. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
250 lines
6 KiB
C
250 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013 Eric Leblond <eric@regit.org>
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*
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* Development of this code partly funded by OISF
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* (http://www.openinfosecfoundation.org/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/jhash.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_queue.h>
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static u32 jhash_initval __read_mostly;
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struct nft_queue {
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u8 sreg_qnum;
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u16 queuenum;
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u16 queues_total;
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u16 flags;
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};
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static void nft_queue_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_queue *priv = nft_expr_priv(expr);
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u32 queue = priv->queuenum;
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u32 ret;
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if (priv->queues_total > 1) {
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if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
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int cpu = raw_smp_processor_id();
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queue = priv->queuenum + cpu % priv->queues_total;
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} else {
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queue = nfqueue_hash(pkt->skb, queue,
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priv->queues_total, nft_pf(pkt),
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jhash_initval);
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}
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}
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ret = NF_QUEUE_NR(queue);
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if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
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ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
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regs->verdict.code = ret;
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}
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static void nft_queue_sreg_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_queue *priv = nft_expr_priv(expr);
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u32 queue, ret;
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queue = regs->data[priv->sreg_qnum];
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ret = NF_QUEUE_NR(queue);
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if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
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ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
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regs->verdict.code = ret;
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}
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static int nft_queue_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_POST_ROUTING));
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switch (ctx->family) {
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case NFPROTO_IPV4:
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case NFPROTO_IPV6:
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case NFPROTO_INET:
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case NFPROTO_BRIDGE:
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break;
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case NFPROTO_NETDEV: /* lacks okfn */
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fallthrough;
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default:
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return -EOPNOTSUPP;
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}
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return nft_chain_validate_hooks(ctx->chain, supported_hooks);
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}
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static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
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[NFTA_QUEUE_NUM] = { .type = NLA_U16 },
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[NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
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[NFTA_QUEUE_FLAGS] = { .type = NLA_U16 },
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[NFTA_QUEUE_SREG_QNUM] = { .type = NLA_U32 },
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};
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static int nft_queue_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_queue *priv = nft_expr_priv(expr);
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u32 maxid;
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priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
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if (tb[NFTA_QUEUE_TOTAL])
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priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
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else
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priv->queues_total = 1;
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if (priv->queues_total == 0)
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return -EINVAL;
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maxid = priv->queues_total - 1 + priv->queuenum;
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if (maxid > U16_MAX)
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return -ERANGE;
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if (tb[NFTA_QUEUE_FLAGS]) {
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priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
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if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
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return -EINVAL;
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}
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return 0;
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}
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static int nft_queue_sreg_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_queue *priv = nft_expr_priv(expr);
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int err;
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err = nft_parse_register_load(tb[NFTA_QUEUE_SREG_QNUM],
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&priv->sreg_qnum, sizeof(u32));
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if (err < 0)
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return err;
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if (tb[NFTA_QUEUE_FLAGS]) {
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priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
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if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
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return -EINVAL;
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if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT)
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int nft_queue_dump(struct sk_buff *skb,
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const struct nft_expr *expr, bool reset)
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{
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const struct nft_queue *priv = nft_expr_priv(expr);
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if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
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nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
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nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static int
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nft_queue_sreg_dump(struct sk_buff *skb,
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const struct nft_expr *expr, bool reset)
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{
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const struct nft_queue *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_QUEUE_SREG_QNUM, priv->sreg_qnum) ||
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nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_queue_type;
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static const struct nft_expr_ops nft_queue_ops = {
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.type = &nft_queue_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
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.eval = nft_queue_eval,
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.init = nft_queue_init,
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.dump = nft_queue_dump,
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.validate = nft_queue_validate,
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.reduce = NFT_REDUCE_READONLY,
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};
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static const struct nft_expr_ops nft_queue_sreg_ops = {
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.type = &nft_queue_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
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.eval = nft_queue_sreg_eval,
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.init = nft_queue_sreg_init,
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.dump = nft_queue_sreg_dump,
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.validate = nft_queue_validate,
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.reduce = NFT_REDUCE_READONLY,
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};
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static const struct nft_expr_ops *
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nft_queue_select_ops(const struct nft_ctx *ctx,
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const struct nlattr * const tb[])
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{
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if (tb[NFTA_QUEUE_NUM] && tb[NFTA_QUEUE_SREG_QNUM])
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return ERR_PTR(-EINVAL);
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init_hashrandom(&jhash_initval);
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if (tb[NFTA_QUEUE_NUM])
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return &nft_queue_ops;
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if (tb[NFTA_QUEUE_SREG_QNUM])
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return &nft_queue_sreg_ops;
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return ERR_PTR(-EINVAL);
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}
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static struct nft_expr_type nft_queue_type __read_mostly = {
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.name = "queue",
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.select_ops = nft_queue_select_ops,
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.policy = nft_queue_policy,
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.maxattr = NFTA_QUEUE_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_queue_module_init(void)
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{
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return nft_register_expr(&nft_queue_type);
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}
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static void __exit nft_queue_module_exit(void)
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{
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nft_unregister_expr(&nft_queue_type);
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}
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module_init(nft_queue_module_init);
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module_exit(nft_queue_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
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MODULE_ALIAS_NFT_EXPR("queue");
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MODULE_DESCRIPTION("Netfilter nftables queue module");
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