On Wed, Jul 27, 2016 at 02:43:13AM +0200, Florian Westphal wrote:
> This allows nft to display payload set operations if the
> header isn't byte aligned or has non-byte divisible sizes.
>
> Signed-off-by: Florian Westphal <[email protected]>
> ---
> src/netlink_delinearize.c | 165
> ++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 160 insertions(+), 5 deletions(-)
>
> diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
> index ae87280..5e28111 100644
> --- a/src/netlink_delinearize.c
> +++ b/src/netlink_delinearize.c
> @@ -1747,6 +1747,165 @@ static void stmt_expr_postprocess(struct rule_pp_ctx
> *ctx)
> expr_postprocess_range(ctx, op);
> }
>
> +static void stmt_payload_binop_pp(struct rule_pp_ctx *ctx, struct expr
> *binop)
> +{
> + struct expr *payload = binop->left;
> + struct expr *mask = binop->right;
> + unsigned int shift;
> +
> + assert(payload->ops->type == EXPR_PAYLOAD);
> + if (payload_expr_trim(payload, mask, &ctx->pctx, &shift)) {
> + __binop_adjust(binop, mask, shift);
> + payload_expr_complete(payload, &ctx->pctx);
> + expr_set_type(mask, payload->dtype,
> + payload->byteorder);
> + }
> +}
> +
> +static void stmt_payload_postprocess(struct rule_pp_ctx *ctx)
> +{
> + struct stmt *stmt = ctx->stmt;
> + struct expr *expr, *binop, *payload, *value, *mask;
> + mpz_t bitmask;
> +
> + expr_postprocess(ctx, &stmt->payload.expr);
> +
> + expr_set_type(stmt->payload.val,
> + stmt->payload.expr->dtype,
> + stmt->payload.expr->byteorder);
> +
> + if (payload_is_known(stmt->payload.expr))
> + goto out;
Could you wrap the whole code below into a function, something like:
stmt_payload_binop_postprocess(...)
(feel free to select a better name that looks consistent to what we
have around), so this looks like:
static void stmt_payload_postprocess(struct rule_pp_ctx *ctx)
{
[...]
expr_postprocess(ctx, &stmt->payload.expr);
expr_set_type(stmt->payload.val,
stmt->payload.expr->dtype,
stmt->payload.expr->byteorder);
if (!payload_is_known(stmt->payload.expr))
stmt_payload_binop_postprocess(...);
expr_postprocess(...);
}
So we reduce the use of gotos a bit.
> + /*
> + * expr_postprocess() failed to decode the payload information.
Thus, this comment becomes a description for this new
stmt_payload_binop_postprocess() function.
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