From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- net/netfilter/nft_objref.c | 244 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100644 net/netfilter/nft_objref.c (limited to 'net/netfilter/nft_objref.c') diff --git a/net/netfilter/nft_objref.c b/net/netfilter/nft_objref.c new file mode 100644 index 0000000000..509011b1ef --- /dev/null +++ b/net/netfilter/nft_objref.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2012-2016 Pablo Neira Ayuso + */ + +#include +#include +#include +#include +#include +#include +#include + +#define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr)) + +void nft_objref_eval(const struct nft_expr *expr, + struct nft_regs *regs, + const struct nft_pktinfo *pkt) +{ + struct nft_object *obj = nft_objref_priv(expr); + + obj->ops->eval(obj, regs, pkt); +} + +static int nft_objref_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_object *obj = nft_objref_priv(expr); + u8 genmask = nft_genmask_next(ctx->net); + u32 objtype; + + if (!tb[NFTA_OBJREF_IMM_NAME] || + !tb[NFTA_OBJREF_IMM_TYPE]) + return -EINVAL; + + objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE])); + obj = nft_obj_lookup(ctx->net, ctx->table, + tb[NFTA_OBJREF_IMM_NAME], objtype, + genmask); + if (IS_ERR(obj)) + return -ENOENT; + + if (!nft_use_inc(&obj->use)) + return -EMFILE; + + nft_objref_priv(expr) = obj; + + return 0; +} + +static int nft_objref_dump(struct sk_buff *skb, + const struct nft_expr *expr, bool reset) +{ + const struct nft_object *obj = nft_objref_priv(expr); + + if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) || + nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE, + htonl(obj->ops->type->type))) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} + +static void nft_objref_deactivate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + enum nft_trans_phase phase) +{ + struct nft_object *obj = nft_objref_priv(expr); + + if (phase == NFT_TRANS_COMMIT) + return; + + nft_use_dec(&obj->use); +} + +static void nft_objref_activate(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_object *obj = nft_objref_priv(expr); + + nft_use_inc_restore(&obj->use); +} + +static const struct nft_expr_ops nft_objref_ops = { + .type = &nft_objref_type, + .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)), + .eval = nft_objref_eval, + .init = nft_objref_init, + .activate = nft_objref_activate, + .deactivate = nft_objref_deactivate, + .dump = nft_objref_dump, + .reduce = NFT_REDUCE_READONLY, +}; + +struct nft_objref_map { + struct nft_set *set; + u8 sreg; + struct nft_set_binding binding; +}; + +void nft_objref_map_eval(const struct nft_expr *expr, + struct nft_regs *regs, + const struct nft_pktinfo *pkt) +{ + struct nft_objref_map *priv = nft_expr_priv(expr); + const struct nft_set *set = priv->set; + struct net *net = nft_net(pkt); + const struct nft_set_ext *ext; + struct nft_object *obj; + bool found; + + found = nft_set_do_lookup(net, set, ®s->data[priv->sreg], &ext); + if (!found) { + ext = nft_set_catchall_lookup(net, set); + if (!ext) { + regs->verdict.code = NFT_BREAK; + return; + } + } + obj = *nft_set_ext_obj(ext); + obj->ops->eval(obj, regs, pkt); +} + +static int nft_objref_map_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_objref_map *priv = nft_expr_priv(expr); + u8 genmask = nft_genmask_next(ctx->net); + struct nft_set *set; + int err; + + set = nft_set_lookup_global(ctx->net, ctx->table, + tb[NFTA_OBJREF_SET_NAME], + tb[NFTA_OBJREF_SET_ID], genmask); + if (IS_ERR(set)) + return PTR_ERR(set); + + if (!(set->flags & NFT_SET_OBJECT)) + return -EINVAL; + + err = nft_parse_register_load(tb[NFTA_OBJREF_SET_SREG], &priv->sreg, + set->klen); + if (err < 0) + return err; + + priv->binding.flags = set->flags & NFT_SET_OBJECT; + + err = nf_tables_bind_set(ctx, set, &priv->binding); + if (err < 0) + return err; + + priv->set = set; + return 0; +} + +static int nft_objref_map_dump(struct sk_buff *skb, + const struct nft_expr *expr, bool reset) +{ + const struct nft_objref_map *priv = nft_expr_priv(expr); + + if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) || + nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} + +static void nft_objref_map_deactivate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + enum nft_trans_phase phase) +{ + struct nft_objref_map *priv = nft_expr_priv(expr); + + nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase); +} + +static void nft_objref_map_activate(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_objref_map *priv = nft_expr_priv(expr); + + nf_tables_activate_set(ctx, priv->set); +} + +static void nft_objref_map_destroy(const struct nft_ctx *ctx, + const struct nft_expr *expr) +{ + struct nft_objref_map *priv = nft_expr_priv(expr); + + nf_tables_destroy_set(ctx, priv->set); +} + +static const struct nft_expr_ops nft_objref_map_ops = { + .type = &nft_objref_type, + .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)), + .eval = nft_objref_map_eval, + .init = nft_objref_map_init, + .activate = nft_objref_map_activate, + .deactivate = nft_objref_map_deactivate, + .destroy = nft_objref_map_destroy, + .dump = nft_objref_map_dump, + .reduce = NFT_REDUCE_READONLY, +}; + +static const struct nft_expr_ops * +nft_objref_select_ops(const struct nft_ctx *ctx, + const struct nlattr * const tb[]) +{ + if (tb[NFTA_OBJREF_SET_SREG] && + (tb[NFTA_OBJREF_SET_NAME] || + tb[NFTA_OBJREF_SET_ID])) + return &nft_objref_map_ops; + else if (tb[NFTA_OBJREF_IMM_NAME] && + tb[NFTA_OBJREF_IMM_TYPE]) + return &nft_objref_ops; + + return ERR_PTR(-EOPNOTSUPP); +} + +static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = { + [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING, + .len = NFT_OBJ_MAXNAMELEN - 1 }, + [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 }, + [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 }, + [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING, + .len = NFT_SET_MAXNAMELEN - 1 }, + [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 }, +}; + +struct nft_expr_type nft_objref_type __read_mostly = { + .name = "objref", + .select_ops = nft_objref_select_ops, + .policy = nft_objref_policy, + .maxattr = NFTA_OBJREF_MAX, + .owner = THIS_MODULE, +}; -- cgit v1.2.3