diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-08-24 09:52:22 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-08-24 09:52:22 +0200 |
commit | a55ca1a24b7b216144dc737f621fb68f4a924e38 (patch) | |
tree | e104f4c5d5ad34b39f58a3b05b80aba85858d0c0 /src/evaluate.c | |
parent | 0e90798e98121abab274434ec60f0b873f510021 (diff) |
src: integrate stateful expressions into sets and maps
The following example shows how to populate a set from the packet path
using the destination IP address, for each entry there is a counter. The
entry expires after the 1 hour timeout if no packets matching this entry
are seen.
table ip x {
set xyz {
type ipv4_addr
size 65535
flags dynamic,timeout
timeout 1h
}
chain y {
type filter hook output priority filter; policy accept;
update @xyz { ip daddr counter } counter
}
}
Similar example, that creates a mapping better IP address and mark,
where the mark is assigned using an incremental sequence generator from
0 to 1 inclusive.
table ip x {
map xyz {
type ipv4_addr : mark
size 65535
flags dynamic,timeout
timeout 1h
}
chain y {
type filter hook input priority filter; policy accept;
update @xyz { ip saddr counter : numgen inc mod 2 }
}
}
Supported stateful statements are: limit, quota, counter and connlimit.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/evaluate.c')
-rw-r--r-- | src/evaluate.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/evaluate.c b/src/evaluate.c index 9bc67d8f..647e1606 100644 --- a/src/evaluate.c +++ b/src/evaluate.c @@ -2708,6 +2708,13 @@ static int stmt_evaluate_set(struct eval_ctx *ctx, struct stmt *stmt) if (stmt->set.key->comment != NULL) return expr_error(ctx->msgs, stmt->set.key, "Key expression comments are not supported"); + if (stmt->set.stmt) { + if (stmt_evaluate(ctx, stmt->set.stmt) < 0) + return -1; + if (!(stmt->set.stmt->flags & STMT_F_STATEFUL)) + return stmt_binary_error(ctx, stmt->set.stmt, stmt, + "meter statement must be stateful"); + } return 0; } @@ -2739,6 +2746,13 @@ static int stmt_evaluate_map(struct eval_ctx *ctx, struct stmt *stmt) if (stmt->map.data->comment != NULL) return expr_error(ctx->msgs, stmt->map.data, "Data expression comments are not supported"); + if (stmt->map.stmt) { + if (stmt_evaluate(ctx, stmt->map.stmt) < 0) + return -1; + if (!(stmt->map.stmt->flags & STMT_F_STATEFUL)) + return stmt_binary_error(ctx, stmt->map.stmt, stmt, + "meter statement must be stateful"); + } return 0; } |