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net/netfilter/nft_dynset.c
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/* * Copyright (c) 2015 Patrick McHardy <kaber@trash.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/netlink.h> #include <linux/netfilter.h> #include <linux/netfilter/nf_tables.h> #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_core.h> struct nft_dynset { struct nft_set *set; struct nft_set_ext_tmpl tmpl; enum nft_dynset_ops op:8; enum nft_registers sreg_key:8; enum nft_registers sreg_data:8; |
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bool invert; |
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u64 timeout; |
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struct nft_expr *expr; |
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struct nft_set_binding binding; }; static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr, |
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struct nft_regs *regs) |
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{ const struct nft_dynset *priv = nft_expr_priv(expr); |
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struct nft_set_ext *ext; |
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u64 timeout; void *elem; if (set->size && !atomic_add_unless(&set->nelems, 1, set->size)) return NULL; timeout = priv->timeout ? : set->timeout; elem = nft_set_elem_init(set, &priv->tmpl, |
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®s->data[priv->sreg_key], ®s->data[priv->sreg_data], |
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timeout, GFP_ATOMIC); |
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if (elem == NULL) goto err1; |
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ext = nft_set_elem_ext(set, elem); |
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if (priv->expr != NULL && nft_expr_clone(nft_set_ext_expr(ext), priv->expr) < 0) |
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goto err2; |
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return elem; |
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err2: nft_set_elem_destroy(set, elem, false); err1: if (set->size) atomic_dec(&set->nelems); return NULL; |
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} static void nft_dynset_eval(const struct nft_expr *expr, |
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struct nft_regs *regs, |
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const struct nft_pktinfo *pkt) { const struct nft_dynset *priv = nft_expr_priv(expr); struct nft_set *set = priv->set; const struct nft_set_ext *ext; |
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const struct nft_expr *sexpr; |
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u64 timeout; |
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if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new, expr, regs, &ext)) { |
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sexpr = NULL; if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) sexpr = nft_set_ext_expr(ext); |
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if (priv->op == NFT_DYNSET_OP_UPDATE && nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { timeout = priv->timeout ? : set->timeout; *nft_set_ext_expiration(ext) = jiffies + timeout; |
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} |
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if (sexpr != NULL) sexpr->ops->eval(sexpr, regs, pkt); |
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if (priv->invert) regs->verdict.code = NFT_BREAK; |
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return; } |
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if (!priv->invert) regs->verdict.code = NFT_BREAK; |
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} static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = { |
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[NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING, .len = NFT_SET_MAXNAMELEN - 1 }, |
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[NFTA_DYNSET_SET_ID] = { .type = NLA_U32 }, [NFTA_DYNSET_OP] = { .type = NLA_U32 }, [NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 }, [NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 }, [NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 }, |
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[NFTA_DYNSET_EXPR] = { .type = NLA_NESTED }, |
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[NFTA_DYNSET_FLAGS] = { .type = NLA_U32 }, |
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}; static int nft_dynset_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_dynset *priv = nft_expr_priv(expr); |
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u8 genmask = nft_genmask_next(ctx->net); |
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struct nft_set *set; u64 timeout; int err; if (tb[NFTA_DYNSET_SET_NAME] == NULL || tb[NFTA_DYNSET_OP] == NULL || tb[NFTA_DYNSET_SREG_KEY] == NULL) return -EINVAL; |
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if (tb[NFTA_DYNSET_FLAGS]) { u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS])); if (flags & ~NFT_DYNSET_F_INV) return -EINVAL; if (flags & NFT_DYNSET_F_INV) priv->invert = true; } |
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set = nft_set_lookup(ctx->net, ctx->table, tb[NFTA_DYNSET_SET_NAME], tb[NFTA_DYNSET_SET_ID], genmask); if (IS_ERR(set)) return PTR_ERR(set); |
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if (set->ops->update == NULL) return -EOPNOTSUPP; |
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if (set->flags & NFT_SET_CONSTANT) return -EBUSY; priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP])); switch (priv->op) { case NFT_DYNSET_OP_ADD: break; case NFT_DYNSET_OP_UPDATE: if (!(set->flags & NFT_SET_TIMEOUT)) return -EOPNOTSUPP; break; default: return -EOPNOTSUPP; } timeout = 0; if (tb[NFTA_DYNSET_TIMEOUT] != NULL) { if (!(set->flags & NFT_SET_TIMEOUT)) return -EINVAL; |
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timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( tb[NFTA_DYNSET_TIMEOUT]))); |
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} |
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priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]); |
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err = nft_validate_register_load(priv->sreg_key, set->klen);; |
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if (err < 0) return err; if (tb[NFTA_DYNSET_SREG_DATA] != NULL) { if (!(set->flags & NFT_SET_MAP)) return -EINVAL; if (set->dtype == NFT_DATA_VERDICT) return -EOPNOTSUPP; |
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priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]); |
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err = nft_validate_register_load(priv->sreg_data, set->dlen); |
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if (err < 0) return err; } else if (set->flags & NFT_SET_MAP) return -EINVAL; |
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if (tb[NFTA_DYNSET_EXPR] != NULL) { if (!(set->flags & NFT_SET_EVAL)) return -EINVAL; if (!(set->flags & NFT_SET_ANONYMOUS)) return -EOPNOTSUPP; priv->expr = nft_expr_init(ctx, tb[NFTA_DYNSET_EXPR]); if (IS_ERR(priv->expr)) return PTR_ERR(priv->expr); err = -EOPNOTSUPP; if (!(priv->expr->ops->type->flags & NFT_EXPR_STATEFUL)) goto err1; } else if (set->flags & NFT_SET_EVAL) return -EINVAL; |
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nft_set_ext_prepare(&priv->tmpl); nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen); if (set->flags & NFT_SET_MAP) nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen); |
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if (priv->expr != NULL) nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR, priv->expr->ops->size); |
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if (set->flags & NFT_SET_TIMEOUT) { if (timeout || set->timeout) nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION); } priv->timeout = timeout; err = nf_tables_bind_set(ctx, set, &priv->binding); if (err < 0) |
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goto err1; |
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priv->set = set; return 0; |
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err1: if (priv->expr != NULL) nft_expr_destroy(ctx, priv->expr); return err; |
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} static void nft_dynset_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) { struct nft_dynset *priv = nft_expr_priv(expr); nf_tables_unbind_set(ctx, priv->set, &priv->binding); |
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if (priv->expr != NULL) nft_expr_destroy(ctx, priv->expr); |
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} static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_dynset *priv = nft_expr_priv(expr); |
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u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0; |
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if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key)) |
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goto nla_put_failure; if (priv->set->flags & NFT_SET_MAP && |
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nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data)) |
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goto nla_put_failure; if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op))) goto nla_put_failure; if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name)) goto nla_put_failure; |
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if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT, cpu_to_be64(jiffies_to_msecs(priv->timeout)), |
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NFTA_DYNSET_PAD)) |
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goto nla_put_failure; |
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if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr)) goto nla_put_failure; |
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if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags))) goto nla_put_failure; |
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return 0; nla_put_failure: return -1; } |
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static const struct nft_expr_ops nft_dynset_ops = { .type = &nft_dynset_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)), .eval = nft_dynset_eval, .init = nft_dynset_init, .destroy = nft_dynset_destroy, .dump = nft_dynset_dump, }; |
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struct nft_expr_type nft_dynset_type __read_mostly = { |
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.name = "dynset", .ops = &nft_dynset_ops, .policy = nft_dynset_policy, .maxattr = NFTA_DYNSET_MAX, .owner = THIS_MODULE, }; |