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netfilter: nft_synproxy: add synproxy stateful object support
Register a new synproxy stateful object type into the stateful object infrastructure. Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
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3474a2c62f
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@ -1481,7 +1481,8 @@ enum nft_ct_expectation_attributes {
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#define NFT_OBJECT_CT_TIMEOUT 7
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#define NFT_OBJECT_SECMARK 8
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#define NFT_OBJECT_CT_EXPECT 9
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#define __NFT_OBJECT_MAX 10
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#define NFT_OBJECT_SYNPROXY 10
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#define __NFT_OBJECT_MAX 11
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#define NFT_OBJECT_MAX (__NFT_OBJECT_MAX - 1)
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/**
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@ -24,7 +24,7 @@ static void nft_synproxy_tcp_options(struct synproxy_options *opts,
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const struct tcphdr *tcp,
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struct synproxy_net *snet,
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struct nf_synproxy_info *info,
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struct nft_synproxy *priv)
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const struct nft_synproxy *priv)
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{
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this_cpu_inc(snet->stats->syn_received);
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if (tcp->ece && tcp->cwr)
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@ -41,14 +41,13 @@ static void nft_synproxy_tcp_options(struct synproxy_options *opts,
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NF_SYNPROXY_OPT_ECN);
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}
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static void nft_synproxy_eval_v4(const struct nft_expr *expr,
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static void nft_synproxy_eval_v4(const struct nft_synproxy *priv,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt,
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const struct tcphdr *tcp,
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struct tcphdr *_tcph,
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struct synproxy_options *opts)
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{
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struct nft_synproxy *priv = nft_expr_priv(expr);
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struct nf_synproxy_info info = priv->info;
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struct net *net = nft_net(pkt);
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struct synproxy_net *snet = synproxy_pernet(net);
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@ -73,14 +72,13 @@ static void nft_synproxy_eval_v4(const struct nft_expr *expr,
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}
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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static void nft_synproxy_eval_v6(const struct nft_expr *expr,
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static void nft_synproxy_eval_v6(const struct nft_synproxy *priv,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt,
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const struct tcphdr *tcp,
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struct tcphdr *_tcph,
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struct synproxy_options *opts)
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{
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struct nft_synproxy *priv = nft_expr_priv(expr);
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struct nf_synproxy_info info = priv->info;
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struct net *net = nft_net(pkt);
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struct synproxy_net *snet = synproxy_pernet(net);
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@ -105,9 +103,9 @@ static void nft_synproxy_eval_v6(const struct nft_expr *expr,
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}
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#endif /* CONFIG_NF_TABLES_IPV6*/
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static void nft_synproxy_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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static void nft_synproxy_do_eval(const struct nft_synproxy *priv,
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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 synproxy_options opts = {};
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struct sk_buff *skb = pkt->skb;
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@ -140,23 +138,22 @@ static void nft_synproxy_eval(const struct nft_expr *expr,
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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nft_synproxy_eval_v4(expr, regs, pkt, tcp, &_tcph, &opts);
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nft_synproxy_eval_v4(priv, regs, pkt, tcp, &_tcph, &opts);
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return;
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case htons(ETH_P_IPV6):
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nft_synproxy_eval_v6(expr, regs, pkt, tcp, &_tcph, &opts);
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nft_synproxy_eval_v6(priv, regs, pkt, tcp, &_tcph, &opts);
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return;
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#endif
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}
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regs->verdict.code = NFT_BREAK;
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}
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static int nft_synproxy_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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static int nft_synproxy_do_init(const struct nft_ctx *ctx,
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const struct nlattr * const tb[],
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struct nft_synproxy *priv)
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{
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struct synproxy_net *snet = synproxy_pernet(ctx->net);
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struct nft_synproxy *priv = nft_expr_priv(expr);
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u32 flags;
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int err;
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@ -206,8 +203,7 @@ nf_ct_failure:
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return err;
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}
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static void nft_synproxy_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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static void nft_synproxy_do_destroy(const struct nft_ctx *ctx)
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{
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struct synproxy_net *snet = synproxy_pernet(ctx->net);
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@ -229,10 +225,8 @@ static void nft_synproxy_destroy(const struct nft_ctx *ctx,
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nf_ct_netns_put(ctx->net, ctx->family);
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}
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static int nft_synproxy_dump(struct sk_buff *skb, const struct nft_expr *expr)
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static int nft_synproxy_do_dump(struct sk_buff *skb, struct nft_synproxy *priv)
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{
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const struct nft_synproxy *priv = nft_expr_priv(expr);
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if (nla_put_be16(skb, NFTA_SYNPROXY_MSS, htons(priv->info.mss)) ||
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nla_put_u8(skb, NFTA_SYNPROXY_WSCALE, priv->info.wscale) ||
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nla_put_be32(skb, NFTA_SYNPROXY_FLAGS, htonl(priv->info.options)))
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@ -244,6 +238,15 @@ nla_put_failure:
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return -1;
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}
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static void nft_synproxy_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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const struct nft_synproxy *priv = nft_expr_priv(expr);
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nft_synproxy_do_eval(priv, regs, pkt);
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}
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static int nft_synproxy_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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@ -252,6 +255,28 @@ static int nft_synproxy_validate(const struct nft_ctx *ctx,
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(1 << NF_INET_FORWARD));
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}
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static int nft_synproxy_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_synproxy *priv = nft_expr_priv(expr);
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return nft_synproxy_do_init(ctx, tb, priv);
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}
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static void nft_synproxy_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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nft_synproxy_do_destroy(ctx);
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}
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static int nft_synproxy_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_synproxy *priv = nft_expr_priv(expr);
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return nft_synproxy_do_dump(skb, priv);
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}
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static struct nft_expr_type nft_synproxy_type;
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static const struct nft_expr_ops nft_synproxy_ops = {
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.eval = nft_synproxy_eval,
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@ -271,14 +296,89 @@ static struct nft_expr_type nft_synproxy_type __read_mostly = {
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.maxattr = NFTA_SYNPROXY_MAX,
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};
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static int nft_synproxy_obj_init(const struct nft_ctx *ctx,
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const struct nlattr * const tb[],
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struct nft_object *obj)
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{
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struct nft_synproxy *priv = nft_obj_data(obj);
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return nft_synproxy_do_init(ctx, tb, priv);
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}
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static void nft_synproxy_obj_destroy(const struct nft_ctx *ctx,
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struct nft_object *obj)
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{
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nft_synproxy_do_destroy(ctx);
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}
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static int nft_synproxy_obj_dump(struct sk_buff *skb,
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struct nft_object *obj, bool reset)
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{
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struct nft_synproxy *priv = nft_obj_data(obj);
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return nft_synproxy_do_dump(skb, priv);
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}
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static void nft_synproxy_obj_eval(struct nft_object *obj,
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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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const struct nft_synproxy *priv = nft_obj_data(obj);
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nft_synproxy_do_eval(priv, regs, pkt);
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}
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static void nft_synproxy_obj_update(struct nft_object *obj,
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struct nft_object *newobj)
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{
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struct nft_synproxy *newpriv = nft_obj_data(newobj);
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struct nft_synproxy *priv = nft_obj_data(obj);
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priv->info = newpriv->info;
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}
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static struct nft_object_type nft_synproxy_obj_type;
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static const struct nft_object_ops nft_synproxy_obj_ops = {
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.type = &nft_synproxy_obj_type,
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.size = sizeof(struct nft_synproxy),
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.init = nft_synproxy_obj_init,
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.destroy = nft_synproxy_obj_destroy,
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.dump = nft_synproxy_obj_dump,
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.eval = nft_synproxy_obj_eval,
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.update = nft_synproxy_obj_update,
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};
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static struct nft_object_type nft_synproxy_obj_type __read_mostly = {
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.type = NFT_OBJECT_SYNPROXY,
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.ops = &nft_synproxy_obj_ops,
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.maxattr = NFTA_SYNPROXY_MAX,
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.policy = nft_synproxy_policy,
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.owner = THIS_MODULE,
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};
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static int __init nft_synproxy_module_init(void)
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{
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return nft_register_expr(&nft_synproxy_type);
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int err;
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err = nft_register_obj(&nft_synproxy_obj_type);
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if (err < 0)
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return err;
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err = nft_register_expr(&nft_synproxy_type);
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if (err < 0)
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goto err;
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return 0;
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err:
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nft_unregister_obj(&nft_synproxy_obj_type);
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return err;
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}
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static void __exit nft_synproxy_module_exit(void)
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{
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return nft_unregister_expr(&nft_synproxy_type);
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nft_unregister_expr(&nft_synproxy_type);
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nft_unregister_obj(&nft_synproxy_obj_type);
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}
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module_init(nft_synproxy_module_init);
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@ -287,3 +387,4 @@ module_exit(nft_synproxy_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Fernando Fernandez <ffmancera@riseup.net>");
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MODULE_ALIAS_NFT_EXPR("synproxy");
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MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_SYNPROXY);
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