netfilter: nft_reject: introduce icmp code abstraction for inet and bridge

[deliverable/linux.git] / net / bridge / netfilter / nft_reject_bridge.c

diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c
index ee3ffe93e14ec73e330da1c1fcbdd6b18cc74be6..a76479535df2a5005968c18422d999aa897b3556 100644 (file)
--- a/net/bridge/netfilter/nft_reject_bridge.c
+++ b/net/bridge/netfilter/nft_reject_bridge.c
@@ -14,21 +14,106 @@
 #include <linux/netfilter/nf_tables.h>
 #include <net/netfilter/nf_tables.h>
 #include <net/netfilter/nft_reject.h>
+#include <net/netfilter/ipv4/nf_reject.h>
+#include <net/netfilter/ipv6/nf_reject.h>
 
 static void nft_reject_bridge_eval(const struct nft_expr *expr,
                                 struct nft_data data[NFT_REG_MAX + 1],
                                 const struct nft_pktinfo *pkt)
 {
+       struct nft_reject *priv = nft_expr_priv(expr);
+       struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
+
        switch (eth_hdr(pkt->skb)->h_proto) {
        case htons(ETH_P_IP):
-               return nft_reject_ipv4_eval(expr, data, pkt);
+               switch (priv->type) {
+               case NFT_REJECT_ICMP_UNREACH:
+                       nf_send_unreach(pkt->skb, priv->icmp_code);
+                       break;
+               case NFT_REJECT_TCP_RST:
+                       nf_send_reset(pkt->skb, pkt->ops->hooknum);
+                       break;
+               case NFT_REJECT_ICMPX_UNREACH:
+                       nf_send_unreach(pkt->skb,
+                                       nft_reject_icmp_code(priv->icmp_code));
+                       break;
+               }
+               break;
        case htons(ETH_P_IPV6):
-               return nft_reject_ipv6_eval(expr, data, pkt);
+               switch (priv->type) {
+               case NFT_REJECT_ICMP_UNREACH:
+                       nf_send_unreach6(net, pkt->skb, priv->icmp_code,
+                                        pkt->ops->hooknum);
+                       break;
+               case NFT_REJECT_TCP_RST:
+                       nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
+                       break;
+               case NFT_REJECT_ICMPX_UNREACH:
+                       nf_send_unreach6(net, pkt->skb,
+                                        nft_reject_icmpv6_code(priv->icmp_code),
+                                        pkt->ops->hooknum);
+                       break;
+               }
+               break;
        default:
                /* No explicit way to reject this protocol, drop it. */
-               data[NFT_REG_VERDICT].verdict = NF_DROP;
                break;
        }
+       data[NFT_REG_VERDICT].verdict = NF_DROP;
+}
+
+static int nft_reject_bridge_init(const struct nft_ctx *ctx,
+                                 const struct nft_expr *expr,
+                                 const struct nlattr * const tb[])
+{
+       struct nft_reject *priv = nft_expr_priv(expr);
+       int icmp_code;
+
+       if (tb[NFTA_REJECT_TYPE] == NULL)
+               return -EINVAL;
+
+       priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
+       switch (priv->type) {
+       case NFT_REJECT_ICMP_UNREACH:
+       case NFT_REJECT_ICMPX_UNREACH:
+               if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
+                       return -EINVAL;
+
+               icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
+               if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
+                   icmp_code > NFT_REJECT_ICMPX_MAX)
+                       return -EINVAL;
+
+               priv->icmp_code = icmp_code;
+               break;
+       case NFT_REJECT_TCP_RST:
+               break;
+       default:
+               return -EINVAL;
+       }
+       return 0;
+}
+
+static int nft_reject_bridge_dump(struct sk_buff *skb,
+                                 const struct nft_expr *expr)
+{
+       const struct nft_reject *priv = nft_expr_priv(expr);
+
+       if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
+               goto nla_put_failure;
+
+       switch (priv->type) {
+       case NFT_REJECT_ICMP_UNREACH:
+       case NFT_REJECT_ICMPX_UNREACH:
+               if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
+                       goto nla_put_failure;
+               break;
+       }
+
+       return 0;
+
+nla_put_failure:
+       return -1;
 }
 
 static struct nft_expr_type nft_reject_bridge_type;
@@ -36,8 +121,8 @@ static const struct nft_expr_ops nft_reject_bridge_ops = {
        .type           = &nft_reject_bridge_type,
        .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
        .eval           = nft_reject_bridge_eval,
-       .init           = nft_reject_init,
-       .dump           = nft_reject_dump,
+       .init           = nft_reject_bridge_init,
+       .dump           = nft_reject_bridge_dump,
 };
 
 static struct nft_expr_type nft_reject_bridge_type __read_mostly = {