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Commit 2c4a488a authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nf_tables: add nf_tables_updchain() 



nf_tables_newchain() is too large, wrap the chain update path in a
function to make it more maintainable.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 9efdb14f

net/netfilter/nf_tables_api.c

+92 −78
Original line number Diff line number Diff line
@@ -1335,6 +1335,97 @@ static void nft_chain_release_hook(struct nft_chain_hook *hook) 
		dev_put(hook->dev);

}



static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,

			      bool create)

{

	const struct nlattr * const *nla = ctx->nla;

	struct nft_table *table = ctx->table;

	struct nft_chain *chain = ctx->chain;

	struct nft_af_info *afi = ctx->afi;

	struct nft_base_chain *basechain;

	struct nft_stats *stats = NULL;

	struct nft_chain_hook hook;

	const struct nlattr *name;

	struct nf_hook_ops *ops;

	struct nft_trans *trans;

	int err, i;



	if (nla[NFTA_CHAIN_HOOK]) {

		if (!nft_is_base_chain(chain))

			return -EBUSY;



		err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,

					   create);

		if (err < 0)

			return err;



		basechain = nft_base_chain(chain);

		if (basechain->type != hook.type) {

			nft_chain_release_hook(&hook);

			return -EBUSY;

		}



		for (i = 0; i < afi->nops; i++) {

			ops = &basechain->ops[i];

			if (ops->hooknum != hook.num ||

			    ops->priority != hook.priority ||

			    ops->dev != hook.dev) {

				nft_chain_release_hook(&hook);

				return -EBUSY;

			}

		}

		nft_chain_release_hook(&hook);

	}



	if (nla[NFTA_CHAIN_HANDLE] &&

	    nla[NFTA_CHAIN_NAME]) {

		struct nft_chain *chain2;



		chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],

						genmask);

		if (IS_ERR(chain2))

			return PTR_ERR(chain2);

	}



	if (nla[NFTA_CHAIN_COUNTERS]) {

		if (!nft_is_base_chain(chain))

			return -EOPNOTSUPP;



		stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);

		if (IS_ERR(stats))

			return PTR_ERR(stats);

	}



	trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,

				sizeof(struct nft_trans_chain));

	if (trans == NULL) {

		free_percpu(stats);

		return -ENOMEM;

	}



	nft_trans_chain_stats(trans) = stats;

	nft_trans_chain_update(trans) = true;



	if (nla[NFTA_CHAIN_POLICY])

		nft_trans_chain_policy(trans) = policy;

	else

		nft_trans_chain_policy(trans) = -1;



	name = nla[NFTA_CHAIN_NAME];

	if (nla[NFTA_CHAIN_HANDLE] && name) {

		nft_trans_chain_name(trans) =

			nla_strdup(name, GFP_KERNEL);

		if (!nft_trans_chain_name(trans)) {

			kfree(trans);

			free_percpu(stats);

			return -ENOMEM;

		}

	}

	list_add_tail(&trans->list, &ctx->net->nft.commit_list);



	return 0;

}



static int nf_tables_newchain(struct net *net, struct sock *nlsk,

			      struct sk_buff *skb, const struct nlmsghdr *nlh,

			      const struct nlattr * const nla[],
@@ -1403,91 +1494,14 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk, 
	}



	if (chain != NULL) {

		struct nft_stats *stats = NULL;

		struct nft_trans *trans;



		if (nlh->nlmsg_flags & NLM_F_EXCL)

			return -EEXIST;

		if (nlh->nlmsg_flags & NLM_F_REPLACE)

			return -EOPNOTSUPP;



		if (nla[NFTA_CHAIN_HOOK]) {

			struct nft_base_chain *basechain;

			struct nft_chain_hook hook;

			struct nf_hook_ops *ops;



			if (!nft_is_base_chain(chain))

				return -EBUSY;



			err = nft_chain_parse_hook(net, nla, afi, &hook,

						   create);

			if (err < 0)

				return err;



			basechain = nft_base_chain(chain);

			if (basechain->type != hook.type) {

				nft_chain_release_hook(&hook);

				return -EBUSY;

			}



			for (i = 0; i < afi->nops; i++) {

				ops = &basechain->ops[i];

				if (ops->hooknum != hook.num ||

				    ops->priority != hook.priority ||

				    ops->dev != hook.dev) {

					nft_chain_release_hook(&hook);

					return -EBUSY;

				}

			}

			nft_chain_release_hook(&hook);

		}



		if (nla[NFTA_CHAIN_HANDLE] && name) {

			struct nft_chain *chain2;



			chain2 = nf_tables_chain_lookup(table,

							nla[NFTA_CHAIN_NAME],

							genmask);

			if (IS_ERR(chain2))

				return PTR_ERR(chain2);

		}



		if (nla[NFTA_CHAIN_COUNTERS]) {

			if (!nft_is_base_chain(chain))

				return -EOPNOTSUPP;



			stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);

			if (IS_ERR(stats))

				return PTR_ERR(stats);

		}



		nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);

		trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,

					sizeof(struct nft_trans_chain));

		if (trans == NULL) {

			free_percpu(stats);

			return -ENOMEM;

		}



		nft_trans_chain_stats(trans) = stats;

		nft_trans_chain_update(trans) = true;



		if (nla[NFTA_CHAIN_POLICY])

			nft_trans_chain_policy(trans) = policy;

		else

			nft_trans_chain_policy(trans) = -1;



		if (nla[NFTA_CHAIN_HANDLE] && name) {

			nft_trans_chain_name(trans) =

				nla_strdup(name, GFP_KERNEL);

			if (!nft_trans_chain_name(trans)) {

				kfree(trans);

				free_percpu(stats);

				return -ENOMEM;

			}

		}

		list_add_tail(&trans->list, &net->nft.commit_list);

		return 0;

		return nf_tables_updchain(&ctx, genmask, policy, create);

	}



	if (table->use == UINT_MAX)