From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Cc: Laurent Vivier <lvivier@redhat.com>
Subject: [PATCH v2 13/20] dhcpv6: move offset initialization out of dhcpv6_opt()
Date: Fri, 11 Apr 2025 15:10:23 +0200 [thread overview]
Message-ID: <20250411131031.1398006-14-lvivier@redhat.com> (raw)
In-Reply-To: <20250411131031.1398006-1-lvivier@redhat.com>
No functional change.
Currently, if dhcpv6_opt() is called with offset set to 0, it will set the
offset to point to DHCPv6 options offset.
To simplify the use of iovec_tail in a later patch, move the initialization
out of the function. Replace all the call using 0 by a call using
the offset of the DHCPv6 options.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
dhcpv6.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/dhcpv6.c b/dhcpv6.c
index 373a98869f9b..be51c278af7a 100644
--- a/dhcpv6.c
+++ b/dhcpv6.c
@@ -54,14 +54,14 @@ struct opt_hdr {
uint16_t l;
} __attribute__((packed));
+#define UDP_MSG_HDR_SIZE (sizeof(struct udphdr) + sizeof(struct msg_hdr))
# define OPT_SIZE_CONV(x) (htons_constant(x))
#define OPT_SIZE(x) OPT_SIZE_CONV(sizeof(struct opt_##x) - \
sizeof(struct opt_hdr))
#define OPT_VSIZE(x) (sizeof(struct opt_##x) - \
sizeof(struct opt_hdr))
#define OPT_MAX_SIZE IPV6_MIN_MTU - (sizeof(struct ipv6hdr) + \
- sizeof(struct udphdr) + \
- sizeof(struct msg_hdr))
+ UDP_MSG_HDR_SIZE)
/**
* struct opt_client_id - DHCPv6 Client Identifier option
@@ -290,8 +290,7 @@ static struct opt_hdr *dhcpv6_opt(const struct pool *p, size_t *offset,
struct opt_hdr *o;
size_t left;
- if (!*offset)
- *offset = sizeof(struct udphdr) + sizeof(struct msg_hdr);
+ ASSERT(*offset >= UDP_MSG_HDR_SIZE);
while ((o = packet_get_try(p, 0, *offset, sizeof(*o), &left))) {
unsigned int opt_len = ntohs(o->l) + sizeof(*o);
@@ -327,7 +326,7 @@ static struct opt_hdr *dhcpv6_ia_notonlink(const struct pool *p,
size_t offset;
foreach(ia_type, ia_types) {
- offset = 0;
+ offset = UDP_MSG_HDR_SIZE;
while ((ia = dhcpv6_opt(p, &offset, *ia_type))) {
if (ntohs(ia->l) < OPT_VSIZE(ia_na))
return NULL;
@@ -464,8 +463,9 @@ static size_t dhcpv6_client_fqdn_fill(const struct pool *p, const struct ctx *c,
o = (struct opt_client_fqdn *)(buf + offset);
encode_domain_name(o->domain_name, c->fqdn);
- req_opt = (struct opt_client_fqdn *)dhcpv6_opt(p, &(size_t){ 0 },
- OPT_CLIENT_FQDN);
+ req_opt = (struct opt_client_fqdn *)dhcpv6_opt(p,
+ &(size_t){ UDP_MSG_HDR_SIZE },
+ OPT_CLIENT_FQDN);
if (req_opt && req_opt->flags & 0x01 /* S flag */)
o->flags = 0x02 /* O flag */;
else
@@ -522,15 +522,15 @@ int dhcpv6(struct ctx *c, const struct pool *p,
if (!mh)
return -1;
- client_id = dhcpv6_opt(p, &(size_t){ 0 }, OPT_CLIENTID);
+ client_id = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_CLIENTID);
if (!client_id || ntohs(client_id->l) > OPT_VSIZE(client_id))
return -1;
- server_id = dhcpv6_opt(p, &(size_t){ 0 }, OPT_SERVERID);
+ server_id = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_SERVERID);
if (server_id && ntohs(server_id->l) != OPT_VSIZE(server_id))
return -1;
- ia = dhcpv6_opt(p, &(size_t){ 0 }, OPT_IA_NA);
+ ia = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_IA_NA);
if (ia && ntohs(ia->l) < MIN(OPT_VSIZE(ia_na), OPT_VSIZE(ia_ta)))
return -1;
@@ -580,7 +580,7 @@ int dhcpv6(struct ctx *c, const struct pool *p,
memcmp(&resp.server_id, server_id, sizeof(resp.server_id)))
return -1;
- if (ia || dhcpv6_opt(p, &(size_t){ 0 }, OPT_IA_TA))
+ if (ia || dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_IA_TA))
return -1;
info("DHCPv6: received INFORMATION_REQUEST, sending REPLY");
--
@@ -54,14 +54,14 @@ struct opt_hdr {
uint16_t l;
} __attribute__((packed));
+#define UDP_MSG_HDR_SIZE (sizeof(struct udphdr) + sizeof(struct msg_hdr))
# define OPT_SIZE_CONV(x) (htons_constant(x))
#define OPT_SIZE(x) OPT_SIZE_CONV(sizeof(struct opt_##x) - \
sizeof(struct opt_hdr))
#define OPT_VSIZE(x) (sizeof(struct opt_##x) - \
sizeof(struct opt_hdr))
#define OPT_MAX_SIZE IPV6_MIN_MTU - (sizeof(struct ipv6hdr) + \
- sizeof(struct udphdr) + \
- sizeof(struct msg_hdr))
+ UDP_MSG_HDR_SIZE)
/**
* struct opt_client_id - DHCPv6 Client Identifier option
@@ -290,8 +290,7 @@ static struct opt_hdr *dhcpv6_opt(const struct pool *p, size_t *offset,
struct opt_hdr *o;
size_t left;
- if (!*offset)
- *offset = sizeof(struct udphdr) + sizeof(struct msg_hdr);
+ ASSERT(*offset >= UDP_MSG_HDR_SIZE);
while ((o = packet_get_try(p, 0, *offset, sizeof(*o), &left))) {
unsigned int opt_len = ntohs(o->l) + sizeof(*o);
@@ -327,7 +326,7 @@ static struct opt_hdr *dhcpv6_ia_notonlink(const struct pool *p,
size_t offset;
foreach(ia_type, ia_types) {
- offset = 0;
+ offset = UDP_MSG_HDR_SIZE;
while ((ia = dhcpv6_opt(p, &offset, *ia_type))) {
if (ntohs(ia->l) < OPT_VSIZE(ia_na))
return NULL;
@@ -464,8 +463,9 @@ static size_t dhcpv6_client_fqdn_fill(const struct pool *p, const struct ctx *c,
o = (struct opt_client_fqdn *)(buf + offset);
encode_domain_name(o->domain_name, c->fqdn);
- req_opt = (struct opt_client_fqdn *)dhcpv6_opt(p, &(size_t){ 0 },
- OPT_CLIENT_FQDN);
+ req_opt = (struct opt_client_fqdn *)dhcpv6_opt(p,
+ &(size_t){ UDP_MSG_HDR_SIZE },
+ OPT_CLIENT_FQDN);
if (req_opt && req_opt->flags & 0x01 /* S flag */)
o->flags = 0x02 /* O flag */;
else
@@ -522,15 +522,15 @@ int dhcpv6(struct ctx *c, const struct pool *p,
if (!mh)
return -1;
- client_id = dhcpv6_opt(p, &(size_t){ 0 }, OPT_CLIENTID);
+ client_id = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_CLIENTID);
if (!client_id || ntohs(client_id->l) > OPT_VSIZE(client_id))
return -1;
- server_id = dhcpv6_opt(p, &(size_t){ 0 }, OPT_SERVERID);
+ server_id = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_SERVERID);
if (server_id && ntohs(server_id->l) != OPT_VSIZE(server_id))
return -1;
- ia = dhcpv6_opt(p, &(size_t){ 0 }, OPT_IA_NA);
+ ia = dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_IA_NA);
if (ia && ntohs(ia->l) < MIN(OPT_VSIZE(ia_na), OPT_VSIZE(ia_ta)))
return -1;
@@ -580,7 +580,7 @@ int dhcpv6(struct ctx *c, const struct pool *p,
memcmp(&resp.server_id, server_id, sizeof(resp.server_id)))
return -1;
- if (ia || dhcpv6_opt(p, &(size_t){ 0 }, OPT_IA_TA))
+ if (ia || dhcpv6_opt(p, &(size_t){ UDP_MSG_HDR_SIZE }, OPT_IA_TA))
return -1;
info("DHCPv6: received INFORMATION_REQUEST, sending REPLY");
--
2.49.0
next prev parent reply other threads:[~2025-04-11 13:11 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-11 13:10 [PATCH v2 00/20] Introduce discontiguous frames management Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 01/20] arp: Don't mix incoming and outgoing buffers Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 02/20] iov: Introduce iov_tail_drop() and iov_slice() Laurent Vivier
2025-04-14 2:14 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 03/20] iov: Update IOV_REMOVE_HEADER() and IOV_PEEK_HEADER() Laurent Vivier
2025-04-14 2:19 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 04/20] tap: Use iov_tail with tap_add_packet() Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 05/20] packet: Use iov_tail with packet_add() Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 06/20] packet: Add packet_base() Laurent Vivier
2025-04-14 2:29 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 07/20] arp: Convert to iov_tail Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 08/20] ndp: " Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 09/20] icmp: " Laurent Vivier
2025-04-14 3:14 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 10/20] udp: " Laurent Vivier
2025-04-14 3:21 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 11/20] tcp: Convert tcp_tap_handler() to use iov_tail Laurent Vivier
2025-04-14 3:26 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 12/20] tcp: Convert tcp_data_from_tap() " Laurent Vivier
2025-04-14 3:28 ` David Gibson
2025-04-11 13:10 ` Laurent Vivier [this message]
2025-04-14 4:07 ` [PATCH v2 13/20] dhcpv6: move offset initialization out of dhcpv6_opt() David Gibson
2025-04-11 13:10 ` [PATCH v2 14/20] dhcpv6: Extract sending of NotOnLink status Laurent Vivier
2025-04-14 4:10 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 15/20] dhcpv6: Convert to iov_tail Laurent Vivier
2025-04-14 4:12 ` David Gibson
2025-04-11 13:10 ` [PATCH v2 16/20] dhcpv6: Use iov_tail in dhcpv6_opt() Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 17/20] dhcp: Convert to iov_tail Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 18/20] ip: Use iov_tail in ipv6_l4hdr() Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 19/20] tap: Convert tap4_handler() to iov_tail Laurent Vivier
2025-04-11 13:10 ` [PATCH v2 20/20] tap: Convert tap6_handler() " Laurent Vivier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250411131031.1398006-14-lvivier@redhat.com \
--to=lvivier@redhat.com \
--cc=passt-dev@passt.top \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://passt.top/passt
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for IMAP folder(s).