From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Cc: Laurent Vivier <lvivier@redhat.com>
Subject: [PATCH v2 17/20] dhcp: Convert to iov_tail
Date: Fri, 11 Apr 2025 15:10:27 +0200 [thread overview]
Message-ID: <20250411131031.1398006-18-lvivier@redhat.com> (raw)
In-Reply-To: <20250411131031.1398006-1-lvivier@redhat.com>
Use packet_base() and extract headers using IOV_REMOVE_HEADER()
and IOV_PEEK_HEADER() rather than packet_get().
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
dhcp.c | 45 +++++++++++++++++++++++++++------------------
1 file changed, 27 insertions(+), 18 deletions(-)
diff --git a/dhcp.c b/dhcp.c
index b0de04be6f27..3365b0632c74 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;
+ size_t mlen, dlen, opt_len;
char macstr[ETH_ADDRSTRLEN];
struct in_addr mask, dst;
const struct ethhdr *eh;
const struct iphdr *iph;
const struct udphdr *uh;
+ struct iov_tail data;
struct msg const *m;
+ struct msg mc;
+ struct ethhdr ehc;
+ struct iphdr iphc;
+ struct udphdr uhc;
struct msg reply;
unsigned int i;
- eh = packet_get(p, 0, offset, sizeof(*eh), NULL);
- offset += sizeof(*eh);
+ if (!packet_base(p, 0, &data))
+ return -1;
- iph = packet_get(p, 0, offset, sizeof(*iph), NULL);
+ eh = IOV_REMOVE_HEADER(&data, ehc);
+ iph = IOV_PEEK_HEADER(&data, iphc);
if (!eh || !iph)
return -1;
- offset += iph->ihl * 4UL;
- uh = packet_get(p, 0, offset, sizeof(*uh), &mlen);
- offset += sizeof(*uh);
+ if (!iov_tail_drop(&data, iph->ihl * 4UL))
+ return -1;
+ uh = IOV_REMOVE_HEADER(&data, uhc);
if (!uh)
return -1;
@@ -332,7 +338,9 @@ 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, &mc, offsetof(struct msg, o),
+ __alignof__(struct msg));
if (!m ||
mlen != ntohs(uh->len) - sizeof(*uh) ||
mlen < offsetof(struct msg, o) ||
@@ -355,27 +363,28 @@ 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 olenc, typec;
+ 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, typec);
+ olen = IOV_REMOVE_HEADER(&data, olenc);
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_tail_drop(&data, *olen);
+ opt_len -= *olen;
}
opts[80].slen = -1;
--
@@ -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;
+ size_t mlen, dlen, opt_len;
char macstr[ETH_ADDRSTRLEN];
struct in_addr mask, dst;
const struct ethhdr *eh;
const struct iphdr *iph;
const struct udphdr *uh;
+ struct iov_tail data;
struct msg const *m;
+ struct msg mc;
+ struct ethhdr ehc;
+ struct iphdr iphc;
+ struct udphdr uhc;
struct msg reply;
unsigned int i;
- eh = packet_get(p, 0, offset, sizeof(*eh), NULL);
- offset += sizeof(*eh);
+ if (!packet_base(p, 0, &data))
+ return -1;
- iph = packet_get(p, 0, offset, sizeof(*iph), NULL);
+ eh = IOV_REMOVE_HEADER(&data, ehc);
+ iph = IOV_PEEK_HEADER(&data, iphc);
if (!eh || !iph)
return -1;
- offset += iph->ihl * 4UL;
- uh = packet_get(p, 0, offset, sizeof(*uh), &mlen);
- offset += sizeof(*uh);
+ if (!iov_tail_drop(&data, iph->ihl * 4UL))
+ return -1;
+ uh = IOV_REMOVE_HEADER(&data, uhc);
if (!uh)
return -1;
@@ -332,7 +338,9 @@ 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, &mc, offsetof(struct msg, o),
+ __alignof__(struct msg));
if (!m ||
mlen != ntohs(uh->len) - sizeof(*uh) ||
mlen < offsetof(struct msg, o) ||
@@ -355,27 +363,28 @@ 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 olenc, typec;
+ 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, typec);
+ olen = IOV_REMOVE_HEADER(&data, olenc);
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_tail_drop(&data, *olen);
+ opt_len -= *olen;
}
opts[80].slen = -1;
--
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 ` [PATCH v2 13/20] dhcpv6: move offset initialization out of dhcpv6_opt() Laurent Vivier
2025-04-14 4:07 ` 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 ` Laurent Vivier [this message]
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
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