From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: passt.top; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=h9Ap9DSP; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by passt.top (Postfix) with ESMTPS id 23FE55A027F for ; Tue, 02 Sep 2025 09:53:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756799615; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N2pPERpLFv0QEvehsm39B2M20Jeh4HZ89hBtLWH3zeg=; b=h9Ap9DSP6mtYCLLtJ40/2GpF38yeZ3eTHQalfVR3xUo1IyEBLOvB5Z6lZw60BUJ/v3grxf Bw/1EY4Qhm9YNbNYMIkF5/JPUYyFaoZUMlf5y4XdIbXYok6MWmH1mViuho/0tyfliCUBWc 5iXWn7HjwFURJLwYAr4Ie2oyUlT0LrE= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-35-YelUvA_rPja57A36J-WTyA-1; Tue, 02 Sep 2025 03:53:32 -0400 X-MC-Unique: YelUvA_rPja57A36J-WTyA-1 X-Mimecast-MFC-AGG-ID: YelUvA_rPja57A36J-WTyA_1756799611 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 29640195608F; Tue, 2 Sep 2025 07:53:31 +0000 (UTC) Received: from lenovo-t14s.redhat.com (unknown [10.45.224.111]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C79BD1800447; Tue, 2 Sep 2025 07:53:29 +0000 (UTC) From: Laurent Vivier To: passt-dev@passt.top Subject: [PATCH v11 17/30] dhcp: Convert to iov_tail Date: Tue, 2 Sep 2025 09:52:40 +0200 Message-ID: <20250902075253.990038-18-lvivier@redhat.com> In-Reply-To: <20250902075253.990038-1-lvivier@redhat.com> References: <20250902075253.990038-1-lvivier@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mxSnuMq1fbdWRD_iQWV1U3t1HeLtOU2N91FWPIV6Tyo_1756799611 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Message-ID-Hash: 33FJTEWHPMQ3S75BNRF6UPIAOKCJFY6U X-Message-ID-Hash: 33FJTEWHPMQ3S75BNRF6UPIAOKCJFY6U X-MailFrom: lvivier@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Laurent Vivier , David Gibson X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Use packet_data() and extract headers using IOV_REMOVE_HEADER() and IOV_PEEK_HEADER() rather than packet_get(). Signed-off-by: Laurent Vivier Reviewed-by: David Gibson --- dhcp.c | 46 ++++++++++++++++++++++++++++------------------ 1 file changed, 28 insertions(+), 18 deletions(-) diff --git a/dhcp.c b/dhcp.c index b0de04be6f27..d33e23ee4d48 100644 --- a/dhcp.c +++ b/dhcp.c @@ -302,27 +302,33 @@ static void opt_set_dns_search(const struct ctx *c, size_t max_len) */ int dhcp(const struct ctx *c, const struct pool *p) { - size_t mlen, dlen, offset = 0, opt_len, opt_off = 0; char macstr[ETH_ADDRSTRLEN]; + size_t mlen, dlen, opt_len; struct in_addr mask, dst; + struct ethhdr eh_storage; + struct iphdr iph_storage; + struct udphdr uh_storage; const struct ethhdr *eh; const struct iphdr *iph; const struct udphdr *uh; + struct iov_tail data; struct msg const *m; struct msg reply; unsigned int i; + struct msg m_storage; - eh = packet_get(p, 0, offset, sizeof(*eh), NULL); - offset += sizeof(*eh); + if (!packet_data(p, 0, &data)) + return -1; - iph = packet_get(p, 0, offset, sizeof(*iph), NULL); + eh = IOV_REMOVE_HEADER(&data, eh_storage); + iph = IOV_PEEK_HEADER(&data, iph_storage); if (!eh || !iph) return -1; - offset += iph->ihl * 4UL; - uh = packet_get(p, 0, offset, sizeof(*uh), &mlen); - offset += sizeof(*uh); + if (!iov_drop_header(&data, iph->ihl * 4UL)) + return -1; + uh = IOV_REMOVE_HEADER(&data, uh_storage); if (!uh) return -1; @@ -332,7 +338,10 @@ int dhcp(const struct ctx *c, const struct pool *p) if (c->no_dhcp) return 1; - m = packet_get(p, 0, offset, offsetof(struct msg, o), &opt_len); + mlen = iov_tail_size(&data); + m = (struct msg const *)iov_remove_header_(&data, &m_storage, + offsetof(struct msg, o), + __alignof__(struct msg)); if (!m || mlen != ntohs(uh->len) - sizeof(*uh) || mlen < offsetof(struct msg, o) || @@ -355,27 +364,28 @@ int dhcp(const struct ctx *c, const struct pool *p) memset(&reply.file, 0, sizeof(reply.file)); reply.magic = m->magic; - offset += offsetof(struct msg, o); - for (i = 0; i < ARRAY_SIZE(opts); i++) opts[i].clen = -1; - while (opt_off + 2 < opt_len) { - const uint8_t *olen, *val; + opt_len = iov_tail_size(&data); + while (opt_len >= 2) { + uint8_t olen_storage, type_storage; + const uint8_t *olen; uint8_t *type; - type = packet_get(p, 0, offset + opt_off, 1, NULL); - olen = packet_get(p, 0, offset + opt_off + 1, 1, NULL); + type = IOV_REMOVE_HEADER(&data, type_storage); + olen = IOV_REMOVE_HEADER(&data, olen_storage); if (!type || !olen) return -1; - val = packet_get(p, 0, offset + opt_off + 2, *olen, NULL); - if (!val) + opt_len = iov_tail_size(&data); + if (opt_len < *olen) return -1; - memcpy(&opts[*type].c, val, *olen); + iov_to_buf(&data.iov[0], data.cnt, data.off, &opts[*type].c, *olen); opts[*type].clen = *olen; - opt_off += *olen + 2; + iov_drop_header(&data, *olen); + opt_len -= *olen; } opts[80].slen = -1; -- 2.50.1