diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-04-04 01:24:07 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-05-19 12:06:10 +0200 |
commit | 1081d11b086afb73e1d8f52f9047d661d8770b82 (patch) | |
tree | 35912d1927792f2f2d2c0f9e61d573a444abebfa /net/netfilter/nf_tables_api.c | |
parent | 7c95f6d866d861268a217003c5202009fa76f252 (diff) |
netfilter: nf_tables: generalise transaction infrastructure
This patch generalises the existing rule transaction infrastructure
so it can be used to handle set, table and chain object transactions
as well. The transaction provides a data area that stores private
information depending on the transaction type.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_tables_api.c')
-rw-r--r-- | net/netfilter/nf_tables_api.c | 123 |
1 files changed, 69 insertions, 54 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 3643bbc720bc..424a6f3cb6c5 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -105,6 +105,25 @@ static void nft_ctx_init(struct nft_ctx *ctx, ctx->nla = nla; } +static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, u32 size) +{ + struct nft_trans *trans; + + trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL); + if (trans == NULL) + return NULL; + + trans->ctx = *ctx; + + return trans; +} + +static void nft_trans_destroy(struct nft_trans *trans) +{ + list_del(&trans->list); + kfree(trans); +} + /* * Tables */ @@ -1557,26 +1576,25 @@ static void nf_tables_rule_destroy(const struct nft_ctx *ctx, kfree(rule); } -#define NFT_RULE_MAXEXPRS 128 - -static struct nft_expr_info *info; - -static struct nft_rule_trans * -nf_tables_trans_add(struct nft_ctx *ctx, struct nft_rule *rule) +static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, + struct nft_rule *rule) { - struct nft_rule_trans *rupd; + struct nft_trans *trans; - rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL); - if (rupd == NULL) - return NULL; + trans = nft_trans_alloc(ctx, sizeof(struct nft_trans_rule)); + if (trans == NULL) + return NULL; - rupd->ctx = *ctx; - rupd->rule = rule; - list_add_tail(&rupd->list, &ctx->net->nft.commit_list); + nft_trans_rule(trans) = rule; + list_add_tail(&trans->list, &ctx->net->nft.commit_list); - return rupd; + return trans; } +#define NFT_RULE_MAXEXPRS 128 + +static struct nft_expr_info *info; + static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, const struct nlmsghdr *nlh, const struct nlattr * const nla[]) @@ -1587,7 +1605,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, struct nft_table *table; struct nft_chain *chain; struct nft_rule *rule, *old_rule = NULL; - struct nft_rule_trans *repl = NULL; + struct nft_trans *trans = NULL; struct nft_expr *expr; struct nft_ctx ctx; struct nlattr *tmp; @@ -1685,8 +1703,8 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, if (nlh->nlmsg_flags & NLM_F_REPLACE) { if (nft_rule_is_active_next(net, old_rule)) { - repl = nf_tables_trans_add(&ctx, old_rule); - if (repl == NULL) { + trans = nft_trans_rule_add(&ctx, old_rule); + if (trans == NULL) { err = -ENOMEM; goto err2; } @@ -1708,7 +1726,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, list_add_rcu(&rule->list, &chain->rules); } - if (nf_tables_trans_add(&ctx, rule) == NULL) { + if (nft_trans_rule_add(&ctx, rule) == NULL) { err = -ENOMEM; goto err3; } @@ -1716,11 +1734,10 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, err3: list_del_rcu(&rule->list); - if (repl) { - list_del_rcu(&repl->rule->list); - list_del(&repl->list); - nft_rule_clear(net, repl->rule); - kfree(repl); + if (trans) { + list_del_rcu(&nft_trans_rule(trans)->list); + nft_rule_clear(net, nft_trans_rule(trans)); + nft_trans_destroy(trans); } err2: nf_tables_rule_destroy(&ctx, rule); @@ -1737,7 +1754,7 @@ nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) { /* You cannot delete the same rule twice */ if (nft_rule_is_active_next(ctx->net, rule)) { - if (nf_tables_trans_add(ctx, rule) == NULL) + if (nft_trans_rule_add(ctx, rule) == NULL) return -ENOMEM; nft_rule_disactivate_next(ctx->net, rule); return 0; @@ -1813,7 +1830,7 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, static int nf_tables_commit(struct sk_buff *skb) { struct net *net = sock_net(skb->sk); - struct nft_rule_trans *rupd, *tmp; + struct nft_trans *trans, *next; /* Bump generation counter, invalidate any dump in progress */ net->nft.genctr++; @@ -1826,38 +1843,38 @@ static int nf_tables_commit(struct sk_buff *skb) */ synchronize_rcu(); - list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { + list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { /* This rule was inactive in the past and just became active. * Clear the next bit of the genmask since its meaning has * changed, now it is the future. */ - if (nft_rule_is_active(net, rupd->rule)) { - nft_rule_clear(net, rupd->rule); - nf_tables_rule_notify(skb, rupd->ctx.nlh, - rupd->ctx.table, rupd->ctx.chain, - rupd->rule, NFT_MSG_NEWRULE, 0, - rupd->ctx.afi->family); - list_del(&rupd->list); - kfree(rupd); + if (nft_rule_is_active(net, nft_trans_rule(trans))) { + nft_rule_clear(net, nft_trans_rule(trans)); + nf_tables_rule_notify(skb, trans->ctx.nlh, + trans->ctx.table, + trans->ctx.chain, + nft_trans_rule(trans), + NFT_MSG_NEWRULE, 0, + trans->ctx.afi->family); + nft_trans_destroy(trans); continue; } /* This rule is in the past, get rid of it */ - list_del_rcu(&rupd->rule->list); - nf_tables_rule_notify(skb, rupd->ctx.nlh, - rupd->ctx.table, rupd->ctx.chain, - rupd->rule, NFT_MSG_DELRULE, 0, - rupd->ctx.afi->family); + list_del_rcu(&nft_trans_rule(trans)->list); + nf_tables_rule_notify(skb, trans->ctx.nlh, + trans->ctx.table, trans->ctx.chain, + nft_trans_rule(trans), NFT_MSG_DELRULE, + 0, trans->ctx.afi->family); } /* Make sure we don't see any packet traversing old rules */ synchronize_rcu(); /* Now we can safely release unused old rules */ - list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { - nf_tables_rule_destroy(&rupd->ctx, rupd->rule); - list_del(&rupd->list); - kfree(rupd); + list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { + nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); + nft_trans_destroy(trans); } return 0; @@ -1866,27 +1883,25 @@ static int nf_tables_commit(struct sk_buff *skb) static int nf_tables_abort(struct sk_buff *skb) { struct net *net = sock_net(skb->sk); - struct nft_rule_trans *rupd, *tmp; + struct nft_trans *trans, *next; - list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { - if (!nft_rule_is_active_next(net, rupd->rule)) { - nft_rule_clear(net, rupd->rule); - list_del(&rupd->list); - kfree(rupd); + list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { + if (!nft_rule_is_active_next(net, nft_trans_rule(trans))) { + nft_rule_clear(net, nft_trans_rule(trans)); + nft_trans_destroy(trans); continue; } /* This rule is inactive, get rid of it */ - list_del_rcu(&rupd->rule->list); + list_del_rcu(&nft_trans_rule(trans)->list); } /* Make sure we don't see any packet accessing aborted rules */ synchronize_rcu(); - list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) { - nf_tables_rule_destroy(&rupd->ctx, rupd->rule); - list_del(&rupd->list); - kfree(rupd); + list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { + nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); + nft_trans_destroy(trans); } return 0; |