Re: [nft PATCH v2] nft: add reject support

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On Mon, Aug 18, 2014 at 10:31:00AM +0200, Alvaro Neira Ayuso wrote:
> This patch allows to use the reject action in rules. Example:
> 
> nft add rule filter input udp dport 22 reject
> 
> In this rule, we assume that the reason is network unreachable. Also
> we can specify the reason with the option "with" and the reason. Example:
> 
> nft add rule filter input tcp dport 22 reject with host-unreach
> 
> In the bridge tables and inet tables, we can use this action too. Example:
> 
> nft add rule inet filter input reject with icmp-host-unreach
> 
> In this rule above, this generates a meta nfproto dependency to match
> ipv4 traffic because we use a icmpv4 reason to reject.
> 
> Signed-off-by: Alvaro Neira Ayuso <alvaroneay@xxxxxxxxx>
> ---
> [Changes in v2]
> * Set Up the icmp code only if we establish it.
> 
> [Tested with the rules]
> [Error ways]
> Reject not supported for arp
>   * nft add rule arp filter input reject (reject not supported for arp)
> 
> Use icmp code field in a ipv6 table or icmpv6 code field in ipv4 table
>   * nft add rule ip filter input reject with icmpv6-no-route
>   * nft add rule ip6 filter input reject with icmp-host-unreach
> 
> Insufficient context for using reject
>   * nft add rule inet filter input reject
>   * nft add rule bridge filter input reject
> 
> Use tcp reset with a udp rule
>   * nft add rule ip filter input udp dport 9999 reject with tcp-reset
> 
> [Hits ways]
> IPV4
>   * nft add rule ip filter input udp dport 9999 reject with
>   * icmp-host-unreach
>   * nft add rule ip filter input tcp dport 9999 reject
>   * nft add rule ip filter input reject
> IPV6
>   * nft add rule ip6 filter input udp dport 9999 reject
>   * nft add rule ip6 filter input tcp dport 9999 /
> 		reject with icmpv6-admin-prohibited
>   * nft add rule ip6 filter input reject
> INET
>   * nft add rule inet filter input reject with icmp-host-unreach
>   * nft add rule inet filter input reject with icmpv6-no-route
>   * nft add rule inet filter input udp dport 9999 counter /
> 				      reject with icmpv6-no-route
> BRIDGE
>   * nft add rule bridge filter input reject with icmp-host-unreach
>   * nft add rule bridge filter input reject with icmpv6-no-route
> 
>  include/statement.h       |    2 +
>  src/evaluate.c            |  116 +++++++++++++++++++++++++++++++++++++++++++--
>  src/netlink_delinearize.c |   37 +++++++++++++++
>  src/netlink_linearize.c   |    4 +-
>  src/parser.y              |   74 +++++++++++++++++++++++++++--
>  src/payload.c             |   31 ++++++++++--
>  src/scanner.l             |    1 +
>  src/statement.c           |   29 ++++++++++++
>  8 files changed, 282 insertions(+), 12 deletions(-)
> 
> diff --git a/include/statement.h b/include/statement.h
> index 480b719..c971aa5 100644
> --- a/include/statement.h
> +++ b/include/statement.h
> @@ -47,6 +47,8 @@ extern struct stmt *limit_stmt_alloc(const struct location *loc);
>  
>  struct reject_stmt {
>  	enum nft_reject_types	type;
> +	int8_t			icmp_code;
> +	unsigned int		family;
>  };
>  
>  extern struct stmt *reject_stmt_alloc(const struct location *loc);
> diff --git a/src/evaluate.c b/src/evaluate.c
> index e05473a..75fe3fe 100644
> --- a/src/evaluate.c
> +++ b/src/evaluate.c
> @@ -17,6 +17,7 @@
>  #include <linux/netfilter.h>
>  #include <linux/netfilter_arp.h>
>  #include <linux/netfilter/nf_tables.h>
> +#include <netinet/ip_icmp.h>
>  
>  #include <expression.h>
>  #include <statement.h>
> @@ -261,6 +262,18 @@ static int expr_evaluate_primary(struct eval_ctx *ctx, struct expr **expr)
>  	return 0;
>  }
>  
> +static struct stmt *expr_stmt_alloc_eval(struct eval_ctx *ctx,
> +					 struct expr *expr)
> +{
> +	struct stmt *nstmt;
> +
> +	nstmt = expr_stmt_alloc(&expr->location, expr);
> +	if (stmt_evaluate(ctx, nstmt) < 0)
> +		BUG("malformed dependency statement");

Please, move this code to payload_gen_dependency() which should return
the new statement.

Look:

 		if (payload_gen_dependency(ctx, payload, &nexpr) < 0)
 			return -1;
-		nstmt = expr_stmt_alloc(&nexpr->location, nexpr);
-		if (stmt_evaluate(ctx, nstmt) < 0)
-			return -1;

and here:

+	if (payload_gen_dependency(ctx, payload, &nexpr) < 0)
+		BUG("error creating reject payload dependency");
+
+	nstmt = expr_stmt_alloc_eval(ctx, nexpr);

in both places you call expr_stmt_alloc_eval() just after
payload_gen_dependency() and you can skip this new function.

This should come as an independent initial patch. Send it to me this
cleanup asap, not need to collect it in a patch series.

> +
> +	return nstmt;
> +}
> +
>  /*
>   * Payload expression: check whether dependencies are fulfilled, otherwise
>   * generate the necessary relational expression and prepend it to the current
> @@ -276,9 +289,7 @@ static int expr_evaluate_payload(struct eval_ctx *ctx, struct expr **expr)
>  	if (ctx->pctx.protocol[base].desc == NULL) {
>  		if (payload_gen_dependency(ctx, payload, &nexpr) < 0)
>  			return -1;
> -		nstmt = expr_stmt_alloc(&nexpr->location, nexpr);
> -		if (stmt_evaluate(ctx, nstmt) < 0)
> -			return -1;
> +		nstmt = expr_stmt_alloc_eval(ctx, nexpr);
>  		list_add_tail(&nstmt->list, &ctx->stmt->list);
>  	} else if (ctx->pctx.protocol[base].desc != payload->payload.desc)
>  		return expr_error(ctx->msgs, payload,
> @@ -1131,8 +1142,107 @@ static int stmt_evaluate_meta(struct eval_ctx *ctx, struct stmt *stmt)
>  	return 0;
>  }
>  
> +static int stmt_reject_gen_dependency(struct stmt *stmt, struct expr *expr,
> +				      struct eval_ctx *ctx)
> +{
> +	struct expr *payload, *nexpr;
> +	struct stmt *nstmt;
> +
> +	if (stmt->reject.icmp_code < 0)
> +		return stmt_error(ctx, stmt, "missing icmp error type");
> +
> +	switch (stmt->reject.family) {
> +	case NFPROTO_IPV4:
> +		payload = payload_expr_alloc(&stmt->location, &proto_ip,
> +					     IPHDR_PROTOCOL);
> +		break;
> +	case NFPROTO_IPV6:
> +		payload = payload_expr_alloc(&stmt->location, &proto_ip6,
> +					     IP6HDR_NEXTHDR);
> +		break;
> +	default:
> +		BUG("unknown reject family");
> +	}
> +
> +	if (payload_gen_dependency(ctx, payload, &nexpr) < 0)
> +		BUG("error creating reject payload dependency");
> +
> +	nstmt = expr_stmt_alloc_eval(ctx, nexpr);
> +	list_add(&nstmt->list, &ctx->cmd->rule->stmts);
> +	return 0;
> +}
> +
>  static int stmt_evaluate_reject(struct eval_ctx *ctx, struct stmt *stmt)
>  {
> +	struct proto_ctx *pctx = &ctx->pctx;
> +	const struct proto_desc *desc, *base;
> +	struct expr *expr = ctx->cmd->expr;
> +	int protonum;
> +
> +	switch (ctx->pctx.family) {
> +	case NFPROTO_ARP:
> +		return stmt_error(ctx, stmt, "cannot use reject with arp");
> +	case NFPROTO_INET:
> +	case NFPROTO_BRIDGE:

>From here:

> +		if (stmt->reject.type != NFT_REJECT_TCP_RST) {
> +			desc = pctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
> +			if (desc == NULL &&
> +			    stmt_reject_gen_dependency(stmt, expr, ctx) < 0)
> +				return -1;
> +		}

to there. You can put all this code in stmt_reject_gen_dependency().
That function is only used once.

> +		break;
> +	case NFPROTO_IPV4:
> +		if (stmt->reject.icmp_code >= 0 &&
> +		    stmt->reject.family != NFPROTO_IPV4 &&
> +		    stmt->reject.type != NFT_REJECT_TCP_RST) {
> +			return stmt_error(ctx, stmt,
> +				  "conflicting protocols specified: ip vs ip6");
> +		}
> +		break;
> +	case NFPROTO_IPV6:
> +		if (stmt->reject.icmp_code >= 0 &&
> +		    stmt->reject.family != NFPROTO_IPV6 &&
> +		    stmt->reject.type != NFT_REJECT_TCP_RST) {

You can simplify the IPv4/IPv6 cases by doing:

        case NFPROTO_IPV4:
        case NFPROTO_IPV6:
                if (stmt->reject.family != ctx->pctx.family)
			return stmt_error(ctx, stmt,
				  "conflicting protocols specified: ip vs ip6");

OK?

> +			return stmt_error(ctx, stmt,
> +				  "conflicting protocols specified: ip6 vs ip");
> +		}
> +		break;
> +	}
> +
> +	base = pctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
> +	desc = pctx->protocol[PROTO_BASE_TRANSPORT_HDR].desc;
> +	/* No sufficient network and transport context */
> +	if (base == NULL || desc == NULL) {

You can simplify this code starting here... see below.

> +		}
> +		if (stmt->reject.icmp_code < 0) {
> +			stmt->reject.type = NFT_REJECT_ICMP_UNREACH;
> +			stmt->reject.icmp_code = ICMP_NET_UNREACH;
> +		}
>
> +		if (stmt->reject.type == NFT_REJECT_TCP_RST) {
> +			return stmt_error(ctx, stmt,
> +				    "insufficient context for using tcp-reset");
> +		}
> +		if (stmt->reject.icmp_code < 0) {
> +			stmt->reject.type = NFT_REJECT_ICMP_UNREACH;
> +			stmt->reject.icmp_code = ICMP_NET_UNREACH;
> +		}
> +	} else {
> +		protonum = proto_find_num(base, desc);
> +		switch (protonum) {
> +		case IPPROTO_TCP:
> +			if (stmt->reject.icmp_code >= 0 &&
> +			    stmt->reject.type != NFT_REJECT_TCP_RST) {
> +				stmt->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				break;
> +			} else
> +				stmt->reject.type = NFT_REJECT_TCP_RST;
> +			break;
> +		default:
> +			if (stmt->reject.type == NFT_REJECT_TCP_RST) {
> +				return stmt_error(ctx, stmt,
> +				     "cannot use tcp-reset without a tcp rule");
> +			}
> +			if (stmt->reject.type != NFT_REJECT_ICMP_UNREACH) {
> +				stmt->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				stmt->reject.icmp_code = ICMP_NET_UNREACH;
> +			}
> +		}
> +	}

to something like:

        protonum = proto_find_num(base, desc);
        if (protonum == IPPROTO_TCP) {
                ...
                return 0;
        }

	if (stmt->reject.type == NFT_REJECT_TCP_RST) {
		return stmt_error(ctx, stmt,
                                  "specify ip protocol tcp with tcp-reset");
	} else if (stmt->reject.type != NFT_REJECT_ICMP_UNREACH) {
		stmt->reject.type = NFT_REJECT_ICMP_UNREACH;
		stmt->reject.icmp_code = ICMP_NET_UNREACH;
	}

You'll have to modify proto_find_num() to return -1 in case that base
or desc are NULL.

Don't forget to:

  	stmt->flags |= STMT_F_TERMINAL;

at the very beginning of stmt_evaluate_reject() as part of the
simplification.

>  	stmt->flags |= STMT_F_TERMINAL;
>  	return 0;
>  }
> diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
> index 5c6ca80..c57e164 100644
> --- a/src/netlink_delinearize.c
> +++ b/src/netlink_delinearize.c
> @@ -14,6 +14,9 @@
>  #include <string.h>
>  #include <limits.h>
>  #include <linux/netfilter/nf_tables.h>
> +#include <arpa/inet.h>
> +#include <linux/netfilter.h>
> +#include <net/ethernet.h>
>  #include <netlink.h>
>  #include <rule.h>
>  #include <statement.h>
> @@ -456,6 +459,9 @@ static void netlink_parse_reject(struct netlink_parse_ctx *ctx,
>  	struct stmt *stmt;
>  
>  	stmt = reject_stmt_alloc(loc);
> +	stmt->reject.type = nft_rule_expr_get_u32(expr, NFT_EXPR_REJECT_TYPE);
> +	stmt->reject.icmp_code = nft_rule_expr_get_u8(expr,
> +						      NFT_EXPR_REJECT_CODE);
>  	list_add_tail(&stmt->list, &ctx->rule->stmts);
>  }
>  
> @@ -872,6 +878,34 @@ static void expr_postprocess(struct rule_pp_ctx *ctx,
>  	}
>  }
>  
> +static void stmt_reject_postprocess(struct rule_pp_ctx rctx, struct stmt *stmt)
> +{
> +	const struct proto_desc *desc, *base;
> +	int protocol;
> +
> +	switch (rctx.pctx.family) {
> +	case NFPROTO_IPV4:
> +	case NFPROTO_IPV6:
> +		stmt->reject.family = rctx.pctx.family;
> +		break;
> +	case NFPROTO_INET:
> +	case NFPROTO_BRIDGE:
> +		if (rctx.pbase != PROTO_BASE_INVALID) {

Better:

                if (rctx.pbase == PROTO_BASE_INVALID)
                       return;

So you can save one level of indentation in the code below...

> +			base = rctx.pctx.protocol[PROTO_BASE_LL_HDR].desc;
> +			desc = rctx.pctx.protocol[PROTO_BASE_NETWORK_HDR].desc;
> +			protocol = proto_find_num(base, desc);
> +			if (protocol == ETH_P_IP)
> +				stmt->reject.family = NFPROTO_IPV4;
> +			else if (protocol == ETH_P_IPV6)
> +				stmt->reject.family = NFPROTO_IPV6;
> +			else
> +				stmt->reject.family = protocol;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +}
>  static void rule_parse_postprocess(struct netlink_parse_ctx *ctx, struct rule *rule)
>  {
>  	struct rule_pp_ctx rctx;
> @@ -899,6 +933,9 @@ static void rule_parse_postprocess(struct netlink_parse_ctx *ctx, struct rule *r
>  			if (stmt->nat.proto != NULL)
>  				expr_postprocess(&rctx, stmt, &stmt->nat.proto);
>  			break;
> +		case STMT_REJECT:
> +			stmt_reject_postprocess(rctx, stmt);
> +			break;
>  		default:
>  			break;
>  		}
> diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c
> index 5c1b46d..0e1d87c 100644
> --- a/src/netlink_linearize.c
> +++ b/src/netlink_linearize.c
> @@ -609,7 +609,9 @@ static void netlink_gen_reject_stmt(struct netlink_linearize_ctx *ctx,
>  
>  	nle = alloc_nft_expr("reject");
>  	nft_rule_expr_set_u32(nle, NFT_EXPR_REJECT_TYPE, stmt->reject.type);
> -	nft_rule_expr_set_u8(nle, NFT_EXPR_REJECT_CODE, 0);
> +	if (stmt->reject.icmp_code != -1)
> +		nft_rule_expr_set_u8(nle, NFT_EXPR_REJECT_CODE, stmt->reject.icmp_code);
> +
>  	nft_rule_add_expr(ctx->nlr, nle);
>  }
>  
> diff --git a/src/parser.y b/src/parser.y
> index 3e08e21..5f15d9d 100644
> --- a/src/parser.y
> +++ b/src/parser.y
> @@ -18,6 +18,8 @@
>  #include <linux/netfilter.h>
>  #include <linux/netfilter/nf_tables.h>
>  #include <linux/netfilter/nf_conntrack_tuple_common.h>
> +#include <netinet/ip_icmp.h>
> +#include <netinet/icmp6.h>
>  #include <libnftnl/common.h>
>  
>  #include <rule.h>
> @@ -359,6 +361,7 @@ static int monitor_lookup_event(const char *event)
>  %token WEEK			"week"
>  
>  %token _REJECT			"reject"
> +%token WITH			"with"
>  
>  %token SNAT			"snat"
>  %token DNAT			"dnat"
> @@ -419,8 +422,8 @@ static int monitor_lookup_event(const char *event)
>  %type <stmt>			limit_stmt
>  %destructor { stmt_free($$); }	limit_stmt
>  %type <val>			time_unit
> -%type <stmt>			reject_stmt
> -%destructor { stmt_free($$); }	reject_stmt
> +%type <stmt>			reject_stmt reject_stmt_alloc
> +%destructor { stmt_free($$); }	reject_stmt reject_stmt_alloc
>  %type <stmt>			nat_stmt nat_stmt_alloc
>  %destructor { stmt_free($$); }	nat_stmt nat_stmt_alloc
>  %type <stmt>			queue_stmt queue_stmt_alloc queue_range
> @@ -1396,12 +1399,77 @@ time_unit		:	SECOND		{ $$ = 1ULL; }
>  			|	WEEK		{ $$ = 1ULL * 60 * 60 * 24 * 7; }
>  			;
>  
> -reject_stmt		:	_REJECT
> +reject_stmt		:	reject_stmt_alloc	reject_opts
> +			;
> +
> +reject_stmt_alloc	:	_REJECT
>  			{
>  				$$ = reject_stmt_alloc(&@$);
>  			}
>  			;
>  
> +reject_opts		:       /* empty */
> +			{
> +				$<stmt>0->reject.type = -1;
> +				$<stmt>0->reject.icmp_code = -1;
> +			}
> +			|	WITH	STRING
> +			{

I think you can simplify this below by allocating a symbol:

 $$ = symbol_expr_alloc(&@$, SYMBOL_VALUE,
                        current_scope(state), $2);

Then, use symbol_parse() from the evaluation path. You'll have to add
a icmp_code_type datatype to src/datatype.c

We'll need this sooner or later for matching by the icmp code support.
This is currently missing.

And you'll need to store the expression in stmt_reject instead of
icmp_code. After the symbol_parse() you get a new expression which
should be of value type.

> +				if (strcmp($2, "icmp-net-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_NET_UNREACH;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-host-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_HOST_UNREACH;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-prot-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_PROT_UNREACH;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-port-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_PORT_UNREACH;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-net-prohibited") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_NET_ANO;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-host-prohibited") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_HOST_ANO;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmp-admin-prohibited") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP_PKT_FILTERED;
> +					$<stmt>0->reject.family = NFPROTO_IPV4;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmpv6-no-route") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP6_DST_UNREACH_NOROUTE;
> +					$<stmt>0->reject.family = NFPROTO_IPV6;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmpv6-admin-prohibited") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP6_DST_UNREACH_ADMIN;
> +					$<stmt>0->reject.family = NFPROTO_IPV6;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmpv6-addr-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP6_DST_UNREACH_ADDR;
> +					$<stmt>0->reject.family = NFPROTO_IPV6;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "icmpv6-port-unreach") == 0) {
> +					$<stmt>0->reject.icmp_code = ICMP6_DST_UNREACH_NOPORT;
> +					$<stmt>0->reject.family = NFPROTO_IPV6;
> +					$<stmt>0->reject.type = NFT_REJECT_ICMP_UNREACH;
> +				} else if (strcmp($2, "tcp-reset") == 0) {
> +					$<stmt>0->reject.type = NFT_REJECT_TCP_RST;
> +					$<stmt>0->reject.icmp_code = -1;
> +				} else {
> +					erec_queue(error(&@2, "invalid icmp code type '%s'",
> +							 $2), state->msgs);
> +					YYERROR;
> +				}
> +			}
> +			;
> +
>  nat_stmt		:	nat_stmt_alloc	nat_stmt_args
>  			;
>  
> diff --git a/src/payload.c b/src/payload.c
> index a1785a5..76c4ce1 100644
> --- a/src/payload.c
> +++ b/src/payload.c
> @@ -183,11 +183,32 @@ int payload_gen_dependency(struct eval_ctx *ctx, const struct expr *expr,
>  	}
>  
>  	desc = ctx->pctx.protocol[expr->payload.base - 1].desc;
> -	/* Special case for mixed IPv4/IPv6 tables: use meta L4 proto */
> -	if (desc == NULL &&
> -	    ctx->pctx.family == NFPROTO_INET &&
> -	    expr->payload.base == PROTO_BASE_TRANSPORT_HDR)
> -		desc = &proto_inet_service;
> +	/* Special case for mixed IPv4/IPv6 and bridge tables */
> +	if (desc == NULL) {
> +		switch (ctx->pctx.family) {
> +		case NFPROTO_INET:
> +			switch (expr->payload.base) {
> +			case PROTO_BASE_TRANSPORT_HDR:
> +				desc = &proto_inet_service;
> +				break;
> +			case PROTO_BASE_LL_HDR:
> +				desc = &proto_inet;
> +				break;

This PROTO_BASE_LL_HDR case is new, what are you catching up with
this?

> +			default:
> +				break;
> +			}
> +			break;
> +		case NFPROTO_BRIDGE:
> +			switch (expr->payload.base) {
> +			case PROTO_BASE_LL_HDR:
> +				desc = &proto_eth;
> +				break;

And why didn't we need this so far?

> +			default:
> +				break;
> +			}
> +			break;
> +		}
> +	}
>  
>  	if (desc == NULL)
>  		return expr_error(ctx->msgs, expr,
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