From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top, Stefano Brivio <sbrivio@redhat.com>
Cc: lvivier@redhat.com, David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v2 5/9] udp: little cleanup in udp_update_hdrX() to prepare future changes
Date: Wed, 6 Mar 2024 16:58:34 +1100 [thread overview]
Message-ID: <20240306055838.1180477-6-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20240306055838.1180477-1-david@gibson.dropbear.id.au>
From: Laurent Vivier <lvivier@redhat.com>
in udp_update_hdr4():
Assign the source address to src, either b->s_in.sin_addr,
c->ip4.dns_match or c->ip4.gw and then set b->iph.saddr to src->s_addr.
in udp_update_hdr6():
Assign the source address to src, either b->s_in6.sin6_addr,
c->ip6.dns_match, c->ip6.gw or c->ip6.addr_ll.
Assign the destination to dst, either c->ip6.addr_seen or
&c->ip6.addr_ll_seen.
Then set dst to b->ip6h.daddr and src to b->ip6h.saddr.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-ID: <20240303135114.1023026-6-lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
udp.c | 39 +++++++++++++++++++--------------------
1 file changed, 19 insertions(+), 20 deletions(-)
diff --git a/udp.c b/udp.c
index 26774df7..2b41a1bd 100644
--- a/udp.c
+++ b/udp.c
@@ -588,7 +588,7 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
const struct timespec *now)
{
struct udp4_l2_buf_t *b = &udp4_l2_buf[n];
- struct in_addr *src;
+ const struct in_addr *src;
in_port_t src_port;
size_t ip_len;
@@ -602,10 +602,9 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_match) &&
IN4_ARE_ADDR_EQUAL(src, &c->ip4.dns_host) && src_port == 53) {
- b->iph.saddr = c->ip4.dns_match.s_addr;
+ src = &c->ip4.dns_match;
} else if (IN4_IS_ADDR_LOOPBACK(src) ||
IN4_ARE_ADDR_EQUAL(src, &c->ip4.addr_seen)) {
- b->iph.saddr = c->ip4.gw.s_addr;
udp_tap_map[V4][src_port].ts = now->tv_sec;
udp_tap_map[V4][src_port].flags |= PORT_LOCAL;
@@ -615,9 +614,10 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
udp_tap_map[V4][src_port].flags &= ~PORT_LOOPBACK;
bitmap_set(udp_act[V4][UDP_ACT_TAP], src_port);
- } else {
- b->iph.saddr = src->s_addr;
+
+ src = &c->ip4.gw;
}
+ b->iph.saddr = src->s_addr;
udp_update_check4(b);
b->uh.source = b->s_in.sin_port;
@@ -640,10 +640,11 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
const struct timespec *now)
{
struct udp6_l2_buf_t *b = &udp6_l2_buf[n];
- struct in6_addr *src;
+ const struct in6_addr *src, *dst;
in_port_t src_port;
size_t ip_len;
+ dst = &c->ip6.addr_seen;
src = &b->s_in6.sin6_addr;
src_port = ntohs(b->s_in6.sin6_port);
@@ -652,23 +653,14 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
b->ip6h.payload_len = htons(udp6_l2_mh_sock[n].msg_len + sizeof(b->uh));
if (IN6_IS_ADDR_LINKLOCAL(src)) {
- b->ip6h.daddr = c->ip6.addr_ll_seen;
- b->ip6h.saddr = b->s_in6.sin6_addr;
+ dst = &c->ip6.addr_ll_seen;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_match) &&
IN6_ARE_ADDR_EQUAL(src, &c->ip6.dns_host) &&
src_port == 53) {
- b->ip6h.daddr = c->ip6.addr_seen;
- b->ip6h.saddr = c->ip6.dns_match;
+ src = &c->ip6.dns_match;
} else if (IN6_IS_ADDR_LOOPBACK(src) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr_seen) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr)) {
- b->ip6h.daddr = c->ip6.addr_ll_seen;
-
- if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
- b->ip6h.saddr = c->ip6.gw;
- else
- b->ip6h.saddr = c->ip6.addr_ll;
-
udp_tap_map[V6][src_port].ts = now->tv_sec;
udp_tap_map[V6][src_port].flags |= PORT_LOCAL;
@@ -683,10 +675,17 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
udp_tap_map[V6][src_port].flags &= ~PORT_GUA;
bitmap_set(udp_act[V6][UDP_ACT_TAP], src_port);
- } else {
- b->ip6h.daddr = c->ip6.addr_seen;
- b->ip6h.saddr = b->s_in6.sin6_addr;
+
+ dst = &c->ip6.addr_ll_seen;
+
+ if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
+ src = &c->ip6.gw;
+ else
+ src = &c->ip6.addr_ll;
+
}
+ b->ip6h.daddr = *dst;
+ b->ip6h.saddr = *src;
b->uh.source = b->s_in6.sin6_port;
b->uh.dest = htons(dstport);
--
@@ -588,7 +588,7 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
const struct timespec *now)
{
struct udp4_l2_buf_t *b = &udp4_l2_buf[n];
- struct in_addr *src;
+ const struct in_addr *src;
in_port_t src_port;
size_t ip_len;
@@ -602,10 +602,9 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_match) &&
IN4_ARE_ADDR_EQUAL(src, &c->ip4.dns_host) && src_port == 53) {
- b->iph.saddr = c->ip4.dns_match.s_addr;
+ src = &c->ip4.dns_match;
} else if (IN4_IS_ADDR_LOOPBACK(src) ||
IN4_ARE_ADDR_EQUAL(src, &c->ip4.addr_seen)) {
- b->iph.saddr = c->ip4.gw.s_addr;
udp_tap_map[V4][src_port].ts = now->tv_sec;
udp_tap_map[V4][src_port].flags |= PORT_LOCAL;
@@ -615,9 +614,10 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t dstport,
udp_tap_map[V4][src_port].flags &= ~PORT_LOOPBACK;
bitmap_set(udp_act[V4][UDP_ACT_TAP], src_port);
- } else {
- b->iph.saddr = src->s_addr;
+
+ src = &c->ip4.gw;
}
+ b->iph.saddr = src->s_addr;
udp_update_check4(b);
b->uh.source = b->s_in.sin_port;
@@ -640,10 +640,11 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
const struct timespec *now)
{
struct udp6_l2_buf_t *b = &udp6_l2_buf[n];
- struct in6_addr *src;
+ const struct in6_addr *src, *dst;
in_port_t src_port;
size_t ip_len;
+ dst = &c->ip6.addr_seen;
src = &b->s_in6.sin6_addr;
src_port = ntohs(b->s_in6.sin6_port);
@@ -652,23 +653,14 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
b->ip6h.payload_len = htons(udp6_l2_mh_sock[n].msg_len + sizeof(b->uh));
if (IN6_IS_ADDR_LINKLOCAL(src)) {
- b->ip6h.daddr = c->ip6.addr_ll_seen;
- b->ip6h.saddr = b->s_in6.sin6_addr;
+ dst = &c->ip6.addr_ll_seen;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_match) &&
IN6_ARE_ADDR_EQUAL(src, &c->ip6.dns_host) &&
src_port == 53) {
- b->ip6h.daddr = c->ip6.addr_seen;
- b->ip6h.saddr = c->ip6.dns_match;
+ src = &c->ip6.dns_match;
} else if (IN6_IS_ADDR_LOOPBACK(src) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr_seen) ||
IN6_ARE_ADDR_EQUAL(src, &c->ip6.addr)) {
- b->ip6h.daddr = c->ip6.addr_ll_seen;
-
- if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
- b->ip6h.saddr = c->ip6.gw;
- else
- b->ip6h.saddr = c->ip6.addr_ll;
-
udp_tap_map[V6][src_port].ts = now->tv_sec;
udp_tap_map[V6][src_port].flags |= PORT_LOCAL;
@@ -683,10 +675,17 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t dstport,
udp_tap_map[V6][src_port].flags &= ~PORT_GUA;
bitmap_set(udp_act[V6][UDP_ACT_TAP], src_port);
- } else {
- b->ip6h.daddr = c->ip6.addr_seen;
- b->ip6h.saddr = b->s_in6.sin6_addr;
+
+ dst = &c->ip6.addr_ll_seen;
+
+ if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
+ src = &c->ip6.gw;
+ else
+ src = &c->ip6.addr_ll;
+
}
+ b->ip6h.daddr = *dst;
+ b->ip6h.saddr = *src;
b->uh.source = b->s_in6.sin6_port;
b->uh.dest = htons(dstport);
--
2.44.0
next prev parent reply other threads:[~2024-03-06 5:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 5:58 [PATCH v2 0/9] vhost-user part 1, v6 David Gibson
2024-03-06 5:58 ` [PATCH v2 1/9] pcap: add pcap_iov() David Gibson
2024-03-06 5:58 ` [PATCH v2 2/9] checksum: align buffers David Gibson
2024-03-06 5:58 ` [PATCH v2 3/9] checksum: add csum_iov() David Gibson
2024-03-06 5:58 ` [PATCH v2 4/9] util: move IP stuff from util.[ch] to ip.[ch] David Gibson
2024-03-06 5:58 ` David Gibson [this message]
2024-03-06 5:58 ` [PATCH v2 6/9] checksum: use csum_ip4_header() in udp.c and tcp.c David Gibson
2024-03-06 5:58 ` [PATCH v2 7/9] checksum: introduce functions to compute the header part checksum for TCP/UDP David Gibson
2024-03-06 5:58 ` [PATCH v2 8/9] tap: make tap_update_mac() generic David Gibson
2024-03-06 5:58 ` [PATCH v2 9/9] tcp: Introduce tcp_fill_headers4()/tcp_fill_headers6() David Gibson
2024-03-06 7:04 ` [PATCH v2 0/9] vhost-user part 1, v6 Stefano Brivio
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