Stefano, you may have already done this, but I hit the same issue
trying to rebase my own code on the vhost-user stuff. This is
Laurent's most recent vhost-user part 1 series, but with fixes applied
for the cppcheck and clang-tidy regressions introduced.
Laurent Vivier (9):
pcap: add pcap_iov()
checksum: align buffers
checksum: add csum_iov()
util: move IP stuff from util.[ch] to ip.[ch]
udp: little cleanup in udp_update_hdrX() to prepare future changes
checksum: use csum_ip4_header() in udp.c and tcp.c
checksum: introduce functions to compute the header part checksum for
TCP/UDP
tap: make tap_update_mac() generic
tcp: Introduce ipv4_fill_headers()/ipv6_fill_headers()
Makefile | 10 +--
checksum.c | 173 ++++++++++++++++++++++++++++++----------
checksum.h | 12 ++-
conf.c | 1 +
dhcp.c | 1 +
flow.c | 1 +
fwd.c | 1 +
icmp.c | 1 +
inany.c | 1 +
iov.c | 1 -
ip.c | 72 +++++++++++++++++
ip.h | 86 ++++++++++++++++++++
ndp.c | 1 +
pcap.c | 27 ++++++-
pcap.h | 1 +
qrap.c | 1 +
tap.c | 13 +--
tap.h | 2 +-
tcp.c | 221 +++++++++++++++++++++++++++++----------------------
tcp_splice.c | 1 +
udp.c | 82 ++++++++-----------
util.c | 55 -------------
util.h | 76 ------------------
23 files changed, 505 insertions(+), 335 deletions(-)
create mode 100644 ip.c
create mode 100644 ip.h
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
Introduce a new function pcap_iov() to capture packet desribed by an IO
vector.
Update pcap_frame() to manage iovcnt > 1.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-2-lvivier(a)redhat.com>
---
iov.c | 1 -
pcap.c | 27 +++++++++++++++++++++++----
pcap.h | 1 +
3 files changed, 24 insertions(+), 5 deletions(-)
diff --git a/iov.c b/iov.c
index e3312628..e7b4eb75 100644
--- a/iov.c
+++ b/iov.c
@@ -146,7 +146,6 @@ size_t iov_to_buf(const struct iovec *iov, size_t iov_cnt,
*
* Returns: The total size in bytes.
*/
-/* cppcheck-suppress unusedFunction */
size_t iov_size(const struct iovec *iov, size_t iov_cnt)
{
unsigned int i;
diff --git a/pcap.c b/pcap.c
index a4057b5f..a0f01ad3 100644
--- a/pcap.c
+++ b/pcap.c
@@ -32,6 +32,7 @@
#include "passt.h"
#include "log.h"
#include "pcap.h"
+#include "iov.h"
#define PCAP_VERSION_MINOR 4
@@ -78,7 +79,7 @@ struct pcap_pkthdr {
static void pcap_frame(const struct iovec *iov, size_t iovcnt,
size_t offset, const struct timeval *tv)
{
- size_t len = iov->iov_len - offset;
+ size_t len = iov_size(iov, iovcnt) - offset;
struct pcap_pkthdr h = {
.tv_sec = tv->tv_sec,
.tv_usec = tv->tv_usec,
@@ -87,10 +88,8 @@ static void pcap_frame(const struct iovec *iov, size_t iovcnt,
};
struct iovec hiov = { &h, sizeof(h) };
- (void)iovcnt;
-
if (write_remainder(pcap_fd, &hiov, 1, 0) < 0 ||
- write_remainder(pcap_fd, iov, 1, offset) < 0) {
+ write_remainder(pcap_fd, iov, iovcnt, offset) < 0) {
debug("Cannot log packet, length %zu: %s",
len, strerror(errno));
}
@@ -135,6 +134,26 @@ void pcap_multiple(const struct iovec *iov, size_t frame_parts,
unsigned int n,
pcap_frame(iov + i * frame_parts, frame_parts, offset, &tv);
}
+/*
+ * pcap_iov - Write packet data described by an I/O vector
+ * to a pcap file descriptor.
+ *
+ * @iov: Pointer to the array of struct iovec describing the I/O vector
+ * containing packet data to write, including L2 header
+ * @iovcnt: Number of buffers (@iov entries)
+ */
+/* cppcheck-suppress unusedFunction */
+void pcap_iov(const struct iovec *iov, size_t iovcnt)
+{
+ struct timeval tv;
+
+ if (pcap_fd == -1)
+ return;
+
+ gettimeofday(&tv, NULL);
+ pcap_frame(iov, iovcnt, 0, &tv);
+}
+
/**
* pcap_init() - Initialise pcap file
* @c: Execution context
diff --git a/pcap.h b/pcap.h
index 85fc58e5..15d46572 100644
--- a/pcap.h
+++ b/pcap.h
@@ -9,6 +9,7 @@
void pcap(const char *pkt, size_t len);
void pcap_multiple(const struct iovec *iov, size_t frame_parts, unsigned int n,
size_t offset);
+void pcap_iov(const struct iovec *iov, size_t iovcnt);
void pcap_init(struct ctx *c);
#endif /* PCAP_H */
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
If buffer is not aligned use sum_16b() only on the not aligned
part, and then use csum_avx2() on the remaining part
Remove unneeded now function csum_unaligned().
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-3-lvivier(a)redhat.com>
---
checksum.c | 47 ++++++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 23 deletions(-)
diff --git a/checksum.c b/checksum.c
index f21c9b7a..65486b46 100644
--- a/checksum.c
+++ b/checksum.c
@@ -56,6 +56,8 @@
#include <linux/udp.h>
#include <linux/icmpv6.h>
+#include "util.h"
+
/* Checksums are optional for UDP over IPv4, so we usually just set
* them to 0. Change this to 1 to calculate real UDP over IPv4
* checksums
@@ -110,20 +112,7 @@ uint16_t csum_fold(uint32_t sum)
return sum;
}
-/**
- * csum_unaligned() - Compute TCP/IP-style checksum for not 32-byte aligned data
- * @buf: Input data
- * @len: Input length
- * @init: Initial 32-bit checksum, 0 for no pre-computed checksum
- *
- * Return: 16-bit IPv4-style checksum
- */
-/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
-__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
-uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init)
-{
- return (uint16_t)~csum_fold(sum_16b(buf, len) + init);
-}
+uint16_t csum(const void *buf, size_t len, uint32_t init);
/**
* csum_ip4_header() - Calculate and set IPv4 header checksum
@@ -132,7 +121,7 @@ uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init)
void csum_ip4_header(struct iphdr *ip4h)
{
ip4h->check = 0;
- ip4h->check = csum_unaligned(ip4h, (size_t)ip4h->ihl * 4, 0);
+ ip4h->check = csum(ip4h, (size_t)ip4h->ihl * 4, 0);
}
/**
@@ -159,7 +148,7 @@ void csum_udp4(struct udphdr *udp4hr,
+ htons(IPPROTO_UDP);
/* Add in partial checksum for the UDP header alone */
psum += sum_16b(udp4hr, sizeof(*udp4hr));
- udp4hr->check = csum_unaligned(payload, len, psum);
+ udp4hr->check = csum(payload, len, psum);
}
}
@@ -178,7 +167,7 @@ void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t
len)
/* Partial checksum for ICMP header alone */
psum = sum_16b(icmp4hr, sizeof(*icmp4hr));
- icmp4hr->checksum = csum_unaligned(payload, len, psum);
+ icmp4hr->checksum = csum(payload, len, psum);
}
/**
@@ -199,7 +188,7 @@ void csum_udp6(struct udphdr *udp6hr,
udp6hr->check = 0;
/* Add in partial checksum for the UDP header alone */
psum += sum_16b(udp6hr, sizeof(*udp6hr));
- udp6hr->check = csum_unaligned(payload, len, psum);
+ udp6hr->check = csum(payload, len, psum);
}
/**
@@ -222,7 +211,7 @@ void csum_icmp6(struct icmp6hdr *icmp6hr,
icmp6hr->icmp6_cksum = 0;
/* Add in partial checksum for the ICMPv6 header alone */
psum += sum_16b(icmp6hr, sizeof(*icmp6hr));
- icmp6hr->icmp6_cksum = csum_unaligned(payload, len, psum);
+ icmp6hr->icmp6_cksum = csum(payload, len, psum);
}
#ifdef __AVX2__
@@ -397,17 +386,29 @@ less_than_128_bytes:
/**
* csum() - Compute TCP/IP-style checksum
- * @buf: Input buffer, must be aligned to 32-byte boundary
+ * @buf: Input buffer
* @len: Input length
* @init: Initial 32-bit checksum, 0 for no pre-computed checksum
*
- * Return: 16-bit folded, complemented checksum sum
+ * Return: 16-bit folded, complemented checksum
*/
/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
uint16_t csum(const void *buf, size_t len, uint32_t init)
{
- return (uint16_t)~csum_fold(csum_avx2(buf, len, init));
+ intptr_t align = ROUND_UP((intptr_t)buf, sizeof(__m256i));
+ unsigned int pad = align - (intptr_t)buf;
+
+ if (len < pad)
+ pad = len;
+
+ if (pad)
+ init += sum_16b(buf, pad);
+
+ if (len > pad)
+ init = csum_avx2((void *)align, len - pad, init);
+
+ return (uint16_t)~csum_fold(init);
}
#else /* __AVX2__ */
@@ -424,7 +425,7 @@ uint16_t csum(const void *buf, size_t len, uint32_t init)
__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
uint16_t csum(const void *buf, size_t len, uint32_t init)
{
- return csum_unaligned(buf, len, init);
+ return (uint16_t)~csum_fold(sum_16b(buf, len) + init);
}
#endif /* !__AVX2__ */
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
Introduce the function csum_unfolded() that computes the unfolded
32-bit checksum of a data buffer, and call it from csum() that returns
the folded value.
Introduce csum_iov() that computes the checksum using csum_folded() on
all vectors of the iovec array and returns the folded result.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-4-lvivier(a)redhat.com>
---
checksum.c | 59 ++++++++++++++++++++++++++++++++++++++++++------------
checksum.h | 4 +++-
2 files changed, 49 insertions(+), 14 deletions(-)
diff --git a/checksum.c b/checksum.c
index 65486b46..643957b5 100644
--- a/checksum.c
+++ b/checksum.c
@@ -57,6 +57,7 @@
#include <linux/icmpv6.h>
#include "util.h"
+#include "checksum.h"
/* Checksums are optional for UDP over IPv4, so we usually just set
* them to 0. Change this to 1 to calculate real UDP over IPv4
@@ -112,8 +113,6 @@ uint16_t csum_fold(uint32_t sum)
return sum;
}
-uint16_t csum(const void *buf, size_t len, uint32_t init);
-
/**
* csum_ip4_header() - Calculate and set IPv4 header checksum
* @ip4h: IPv4 header
@@ -385,16 +384,17 @@ less_than_128_bytes:
}
/**
- * csum() - Compute TCP/IP-style checksum
- * @buf: Input buffer
- * @len: Input length
- * @init: Initial 32-bit checksum, 0 for no pre-computed checksum
+ * csum_unfolded - Calculate the unfolded checksum of a data buffer.
*
- * Return: 16-bit folded, complemented checksum
+ * @buf: Input buffer
+ * @len: Input length
+ * @init: Initial 32-bit checksum, 0 for no pre-computed checksum
+ *
+ * Return: 32-bit unfolded
*/
/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
-uint16_t csum(const void *buf, size_t len, uint32_t init)
+uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init)
{
intptr_t align = ROUND_UP((intptr_t)buf, sizeof(__m256i));
unsigned int pad = align - (intptr_t)buf;
@@ -408,16 +408,31 @@ uint16_t csum(const void *buf, size_t len, uint32_t init)
if (len > pad)
init = csum_avx2((void *)align, len - pad, init);
- return (uint16_t)~csum_fold(init);
+ return init;
}
-
#else /* __AVX2__ */
+/**
+ * csum_unfolded - Calculate the unfolded checksum of a data buffer.
+ *
+ * @buf: Input buffer
+ * @len: Input length
+ * @init: Initial 32-bit checksum, 0 for no pre-computed checksum
+ *
+ * Return: 32-bit unfolded checksum
+ */
+/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
+__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
+uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init)
+{
+ return sum_16b(buf, len) + init;
+}
+#endif /* !__AVX2__ */
/**
* csum() - Compute TCP/IP-style checksum
* @buf: Input buffer
* @len: Input length
- * @sum: Initial 32-bit checksum, 0 for no pre-computed checksum
+ * @init: Initial 32-bit checksum, 0 for no pre-computed checksum
*
* Return: 16-bit folded, complemented checksum
*/
@@ -425,7 +440,25 @@ uint16_t csum(const void *buf, size_t len, uint32_t init)
__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
uint16_t csum(const void *buf, size_t len, uint32_t init)
{
- return (uint16_t)~csum_fold(sum_16b(buf, len) + init);
+ return (uint16_t)~csum_fold(csum_unfolded(buf, len, init));
}
-#endif /* !__AVX2__ */
+/**
+ * csum_iov() - Calculates the unfolded checksum over an array of IO vectors
+ *
+ * @iov Pointer to the array of IO vectors
+ * @n Length of the array
+ * @init Initial 32-bit checksum, 0 for no pre-computed checksum
+ *
+ * Return: 16-bit folded, complemented checksum
+ */
+/* cppcheck-suppress unusedFunction */
+uint16_t csum_iov(const struct iovec *iov, size_t n, uint32_t init)
+{
+ unsigned int i;
+
+ for (i = 0; i < n; i++)
+ init = csum_unfolded(iov[i].iov_base, iov[i].iov_len, init);
+
+ return (uint16_t)~csum_fold(init);
+}
diff --git a/checksum.h b/checksum.h
index 21c0310d..cb80ab38 100644
--- a/checksum.h
+++ b/checksum.h
@@ -17,13 +17,15 @@ void csum_ip4_header(struct iphdr *ip4h);
void csum_udp4(struct udphdr *udp4hr,
struct in_addr saddr, struct in_addr daddr,
const void *payload, size_t len);
-void csum_icmp4(struct icmphdr *ih, const void *payload, size_t len);
+void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len);
void csum_udp6(struct udphdr *udp6hr,
const struct in6_addr *saddr, const struct in6_addr *daddr,
const void *payload, size_t len);
void csum_icmp6(struct icmp6hdr *icmp6hr,
const struct in6_addr *saddr, const struct in6_addr *daddr,
const void *payload, size_t len);
+uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init);
uint16_t csum(const void *buf, size_t len, uint32_t init);
+uint16_t csum_iov(const struct iovec *iov, size_t n, uint32_t init);
#endif /* CHECKSUM_H */
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
Introduce ip.[ch] file to encapsulate IP protocol handling functions and
structures. Modify various files to include the new header ip.h when
it's needed.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-5-lvivier(a)redhat.com>
---
Makefile | 10 +++---
conf.c | 1 +
dhcp.c | 1 +
flow.c | 1 +
fwd.c | 1 +
icmp.c | 1 +
inany.c | 1 +
ip.c | 72 +++++++++++++++++++++++++++++++++++++++++++
ip.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
ndp.c | 1 +
qrap.c | 1 +
tap.c | 1 +
tcp.c | 1 +
tcp_splice.c | 1 +
udp.c | 1 +
util.c | 55 ---------------------------------
util.h | 76 ----------------------------------------------
17 files changed, 175 insertions(+), 136 deletions(-)
create mode 100644 ip.c
create mode 100644 ip.h
diff --git a/Makefile b/Makefile
index 8f966941..2735797a 100644
--- a/Makefile
+++ b/Makefile
@@ -45,8 +45,8 @@ FLAGS += -DVERSION=\"$(VERSION)\"
FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS)
PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c flow.c fwd.c \
- icmp.c igmp.c inany.c iov.c isolation.c lineread.c log.c mld.c ndp.c \
- netlink.c packet.c passt.c pasta.c pcap.c pif.c tap.c tcp.c \
+ icmp.c igmp.c inany.c iov.c ip.c isolation.c lineread.c log.c mld.c \
+ ndp.c netlink.c packet.c passt.c pasta.c pcap.c pif.c tap.c tcp.c \
tcp_splice.c udp.c util.c
QRAP_SRCS = qrap.c
SRCS = $(PASST_SRCS) $(QRAP_SRCS)
@@ -54,9 +54,9 @@ SRCS = $(PASST_SRCS) $(QRAP_SRCS)
MANPAGES = passt.1 pasta.1 qrap.1
PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h flow.h fwd.h \
- flow_table.h icmp.h inany.h iov.h isolation.h lineread.h log.h ndp.h \
- netlink.h packet.h passt.h pasta.h pcap.h pif.h siphash.h tap.h tcp.h \
- tcp_conn.h tcp_splice.h udp.h util.h
+ flow_table.h icmp.h inany.h iov.h ip.h isolation.h lineread.h log.h \
+ ndp.h netlink.h packet.h passt.h pasta.h pcap.h pif.h siphash.h tap.h \
+ tcp.h tcp_conn.h tcp_splice.h udp.h util.h
HEADERS = $(PASST_HEADERS) seccomp.h
C := \#include <linux/tcp.h>\nstruct tcp_info x = { .tcpi_snd_wnd = 0 };
diff --git a/conf.c b/conf.c
index e630140d..4a783b8b 100644
--- a/conf.c
+++ b/conf.c
@@ -35,6 +35,7 @@
#include <netinet/if_ether.h>
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "netlink.h"
#include "udp.h"
diff --git a/dhcp.c b/dhcp.c
index 11077286..ff4834a3 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -25,6 +25,7 @@
#include <limits.h>
#include "util.h"
+#include "ip.h"
#include "checksum.h"
#include "packet.h"
#include "passt.h"
diff --git a/flow.c b/flow.c
index d7974d59..5bb24ccf 100644
--- a/flow.c
+++ b/flow.c
@@ -11,6 +11,7 @@
#include <string.h>
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "siphash.h"
#include "inany.h"
diff --git a/fwd.c b/fwd.c
index 09650b26..a235d131 100644
--- a/fwd.c
+++ b/fwd.c
@@ -21,6 +21,7 @@
#include <stdio.h>
#include "util.h"
+#include "ip.h"
#include "fwd.h"
#include "passt.h"
#include "lineread.h"
diff --git a/icmp.c b/icmp.c
index fb2fcafc..49d6dd92 100644
--- a/icmp.c
+++ b/icmp.c
@@ -33,6 +33,7 @@
#include "packet.h"
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "tap.h"
#include "log.h"
diff --git a/inany.c b/inany.c
index 1c165b14..c8479a75 100644
--- a/inany.c
+++ b/inany.c
@@ -13,6 +13,7 @@
#include <arpa/inet.h>
#include "util.h"
+#include "ip.h"
#include "siphash.h"
#include "inany.h"
diff --git a/ip.c b/ip.c
new file mode 100644
index 00000000..2cc7f654
--- /dev/null
+++ b/ip.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/* PASST - Plug A Simple Socket Transport
+ * for qemu/UNIX domain socket mode
+ *
+ * PASTA - Pack A Subtle Tap Abstraction
+ * for network namespace/tap device mode
+ *
+ * ip.c - IP related functions
+ *
+ * Copyright (c) 2020-2021 Red Hat GmbH
+ * Author: Stefano Brivio <sbrivio(a)redhat.com>
+ */
+
+#include <stddef.h>
+#include "util.h"
+#include "ip.h"
+
+#define IPV6_NH_OPT(nh) \
+ ((nh) == 0 || (nh) == 43 || (nh) == 44 || (nh) == 50 || \
+ (nh) == 51 || (nh) == 60 || (nh) == 135 || (nh) == 139 || \
+ (nh) == 140 || (nh) == 253 || (nh) == 254)
+
+/**
+ * ipv6_l4hdr() - Find pointer to L4 header in IPv6 packet and extract protocol
+ * @p: Packet pool, packet number @idx has IPv6 header at @offset
+ * @idx: Index of packet in pool
+ * @offset: Pre-calculated IPv6 header offset
+ * @proto: Filled with L4 protocol number
+ * @dlen: Data length (payload excluding header extensions), set on return
+ *
+ * Return: pointer to L4 header, NULL if not found
+ */
+char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
+ size_t *dlen)
+{
+ const struct ipv6_opt_hdr *o;
+ const struct ipv6hdr *ip6h;
+ char *base;
+ int hdrlen;
+ uint8_t nh;
+
+ base = packet_get(p, idx, 0, 0, NULL);
+ ip6h = packet_get(p, idx, offset, sizeof(*ip6h), dlen);
+ if (!ip6h)
+ return NULL;
+
+ offset += sizeof(*ip6h);
+
+ nh = ip6h->nexthdr;
+ if (!IPV6_NH_OPT(nh))
+ goto found;
+
+ while ((o = packet_get_try(p, idx, offset, sizeof(*o), dlen))) {
+ nh = o->nexthdr;
+ hdrlen = (o->hdrlen + 1) * 8;
+
+ if (IPV6_NH_OPT(nh))
+ offset += hdrlen;
+ else
+ goto found;
+ }
+
+ return NULL;
+
+found:
+ if (nh == 59)
+ return NULL;
+
+ *proto = nh;
+ return base + offset;
+}
diff --git a/ip.h b/ip.h
new file mode 100644
index 00000000..9be47783
--- /dev/null
+++ b/ip.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (c) 2021 Red Hat GmbH
+ * Author: Stefano Brivio <sbrivio(a)redhat.com>
+ */
+
+#ifndef IP_H
+#define IP_H
+
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+
+#define IN4_IS_ADDR_UNSPECIFIED(a) \
+ (((struct in_addr *)(a))->s_addr == htonl_constant(INADDR_ANY))
+#define IN4_IS_ADDR_BROADCAST(a) \
+ (((struct in_addr *)(a))->s_addr == htonl_constant(INADDR_BROADCAST))
+#define IN4_IS_ADDR_LOOPBACK(a) \
+ (ntohl(((struct in_addr *)(a))->s_addr) >> IN_CLASSA_NSHIFT == IN_LOOPBACKNET)
+#define IN4_IS_ADDR_MULTICAST(a) \
+ (IN_MULTICAST(ntohl(((struct in_addr *)(a))->s_addr)))
+#define IN4_ARE_ADDR_EQUAL(a, b) \
+ (((struct in_addr *)(a))->s_addr == ((struct in_addr *)b)->s_addr)
+#define IN4ADDR_LOOPBACK_INIT \
+ { .s_addr = htonl_constant(INADDR_LOOPBACK) }
+#define IN4ADDR_ANY_INIT \
+ { .s_addr = htonl_constant(INADDR_ANY) }
+
+#define L2_BUF_IP4_INIT(proto) \
+ { \
+ .version = 4, \
+ .ihl = 5, \
+ .tos = 0, \
+ .tot_len = 0, \
+ .id = 0, \
+ .frag_off = 0, \
+ .ttl = 0xff, \
+ .protocol = (proto), \
+ .saddr = 0, \
+ .daddr = 0, \
+ }
+#define L2_BUF_IP4_PSUM(proto) ((uint32_t)htons_constant(0x4500) + \
+ (uint32_t)htons_constant(0xff00 | (proto)))
+
+#define L2_BUF_IP6_INIT(proto) \
+ { \
+ .priority = 0, \
+ .version = 6, \
+ .flow_lbl = { 0 }, \
+ .payload_len = 0, \
+ .nexthdr = (proto), \
+ .hop_limit = 255, \
+ .saddr = IN6ADDR_ANY_INIT, \
+ .daddr = IN6ADDR_ANY_INIT, \
+ }
+
+struct ipv6hdr {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#if __BYTE_ORDER == __BIG_ENDIAN
+ uint8_t version:4,
+ priority:4;
+#else
+ uint8_t priority:4,
+ version:4;
+#endif
+#pragma GCC diagnostic pop
+ uint8_t flow_lbl[3];
+
+ uint16_t payload_len;
+ uint8_t nexthdr;
+ uint8_t hop_limit;
+
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+};
+
+struct ipv6_opt_hdr {
+ uint8_t nexthdr;
+ uint8_t hdrlen;
+ /*
+ * TLV encoded option data follows.
+ */
+} __attribute__((packed)); /* required for some archs */
+
+char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
+ size_t *dlen);
+#endif /* IP_H */
diff --git a/ndp.c b/ndp.c
index 4c85ab8b..c58f4b22 100644
--- a/ndp.c
+++ b/ndp.c
@@ -28,6 +28,7 @@
#include "checksum.h"
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "tap.h"
#include "log.h"
diff --git a/qrap.c b/qrap.c
index 97f350a4..d5967062 100644
--- a/qrap.c
+++ b/qrap.c
@@ -32,6 +32,7 @@
#include <linux/icmpv6.h>
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "arp.h"
diff --git a/tap.c b/tap.c
index 3a666212..d35d8944 100644
--- a/tap.c
+++ b/tap.c
@@ -45,6 +45,7 @@
#include "checksum.h"
#include "util.h"
+#include "ip.h"
#include "iov.h"
#include "passt.h"
#include "arp.h"
diff --git a/tcp.c b/tcp.c
index 560d1d49..e0588f92 100644
--- a/tcp.c
+++ b/tcp.c
@@ -290,6 +290,7 @@
#include "checksum.h"
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "tap.h"
#include "siphash.h"
diff --git a/tcp_splice.c b/tcp_splice.c
index 4957abb8..d066112c 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -49,6 +49,7 @@
#include <sys/socket.h>
#include "util.h"
+#include "ip.h"
#include "passt.h"
#include "log.h"
#include "tcp_splice.h"
diff --git a/udp.c b/udp.c
index cb7c31f7..26774df7 100644
--- a/udp.c
+++ b/udp.c
@@ -113,6 +113,7 @@
#include "checksum.h"
#include "util.h"
+#include "ip.h"
#include "siphash.h"
#include "inany.h"
#include "passt.h"
diff --git a/util.c b/util.c
index 81449b78..bac5a534 100644
--- a/util.c
+++ b/util.c
@@ -32,61 +32,6 @@
#include "packet.h"
#include "log.h"
-#define IPV6_NH_OPT(nh) \
- ((nh) == 0 || (nh) == 43 || (nh) == 44 || (nh) == 50 || \
- (nh) == 51 || (nh) == 60 || (nh) == 135 || (nh) == 139 || \
- (nh) == 140 || (nh) == 253 || (nh) == 254)
-
-/**
- * ipv6_l4hdr() - Find pointer to L4 header in IPv6 packet and extract protocol
- * @p: Packet pool, packet number @idx has IPv6 header at @offset
- * @idx: Index of packet in pool
- * @offset: Pre-calculated IPv6 header offset
- * @proto: Filled with L4 protocol number
- * @dlen: Data length (payload excluding header extensions), set on return
- *
- * Return: pointer to L4 header, NULL if not found
- */
-char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
- size_t *dlen)
-{
- const struct ipv6_opt_hdr *o;
- const struct ipv6hdr *ip6h;
- char *base;
- int hdrlen;
- uint8_t nh;
-
- base = packet_get(p, idx, 0, 0, NULL);
- ip6h = packet_get(p, idx, offset, sizeof(*ip6h), dlen);
- if (!ip6h)
- return NULL;
-
- offset += sizeof(*ip6h);
-
- nh = ip6h->nexthdr;
- if (!IPV6_NH_OPT(nh))
- goto found;
-
- while ((o = packet_get_try(p, idx, offset, sizeof(*o), dlen))) {
- nh = o->nexthdr;
- hdrlen = (o->hdrlen + 1) * 8;
-
- if (IPV6_NH_OPT(nh))
- offset += hdrlen;
- else
- goto found;
- }
-
- return NULL;
-
-found:
- if (nh == 59)
- return NULL;
-
- *proto = nh;
- return base + offset;
-}
-
/**
* sock_l4() - Create and bind socket for given L4, add to epoll list
* @c: Execution context
diff --git a/util.h b/util.h
index 55513490..25e54a77 100644
--- a/util.h
+++ b/util.h
@@ -110,22 +110,6 @@
#define htonl_constant(x) (__bswap_constant_32(x))
#endif
-#define IN4_IS_ADDR_UNSPECIFIED(a) \
- (((struct in_addr *)(a))->s_addr == htonl_constant(INADDR_ANY))
-#define IN4_IS_ADDR_BROADCAST(a) \
- (((struct in_addr *)(a))->s_addr == htonl_constant(INADDR_BROADCAST))
-#define IN4_IS_ADDR_LOOPBACK(a) \
- (ntohl(((struct in_addr *)(a))->s_addr) >> IN_CLASSA_NSHIFT == IN_LOOPBACKNET)
-#define IN4_IS_ADDR_MULTICAST(a) \
- (IN_MULTICAST(ntohl(((struct in_addr *)(a))->s_addr)))
-#define IN4_ARE_ADDR_EQUAL(a, b) \
- (((struct in_addr *)(a))->s_addr == ((struct in_addr *)b)->s_addr)
-#define IN4ADDR_LOOPBACK_INIT \
- { .s_addr = htonl_constant(INADDR_LOOPBACK) }
-#define IN4ADDR_ANY_INIT \
- { .s_addr = htonl_constant(INADDR_ANY) }
-
-
#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 8)
int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
void *arg);
@@ -138,34 +122,6 @@ int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size,
int flags,
(void *)(arg)); \
} while (0)
-#define L2_BUF_IP4_INIT(proto) \
- { \
- .version = 4, \
- .ihl = 5, \
- .tos = 0, \
- .tot_len = 0, \
- .id = 0, \
- .frag_off = 0, \
- .ttl = 0xff, \
- .protocol = (proto), \
- .saddr = 0, \
- .daddr = 0, \
- }
-#define L2_BUF_IP4_PSUM(proto) ((uint32_t)htons_constant(0x4500) + \
- (uint32_t)htons_constant(0xff00 | (proto)))
-
-#define L2_BUF_IP6_INIT(proto) \
- { \
- .priority = 0, \
- .version = 6, \
- .flow_lbl = { 0 }, \
- .payload_len = 0, \
- .nexthdr = (proto), \
- .hop_limit = 255, \
- .saddr = IN6ADDR_ANY_INIT, \
- .daddr = IN6ADDR_ANY_INIT, \
- }
-
#define RCVBUF_BIG (2UL * 1024 * 1024)
#define SNDBUF_BIG (4UL * 1024 * 1024)
#define SNDBUF_SMALL (128UL * 1024)
@@ -173,45 +129,13 @@ int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size,
int flags,
#include <net/if.h>
#include <limits.h>
#include <stdint.h>
-#include <netinet/ip6.h>
#include "packet.h"
struct ctx;
-struct ipv6hdr {
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wpedantic"
-#if __BYTE_ORDER == __BIG_ENDIAN
- uint8_t version:4,
- priority:4;
-#else
- uint8_t priority:4,
- version:4;
-#endif
-#pragma GCC diagnostic pop
- uint8_t flow_lbl[3];
-
- uint16_t payload_len;
- uint8_t nexthdr;
- uint8_t hop_limit;
-
- struct in6_addr saddr;
- struct in6_addr daddr;
-};
-
-struct ipv6_opt_hdr {
- uint8_t nexthdr;
- uint8_t hdrlen;
- /*
- * TLV encoded option data follows.
- */
-} __attribute__((packed)); /* required for some archs */
-
/* cppcheck-suppress funcArgNamesDifferent */
__attribute__ ((weak)) int ffsl(long int i) { return __builtin_ffsl(i); }
-char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
- size_t *dlen);
int sock_l4(const struct ctx *c, sa_family_t af, uint8_t proto,
const void *bind_addr, const char *ifname, uint16_t port,
uint32_t data);
--
2.44.0
From: Laurent Vivier <lvivier(a)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(a)redhat.com>
Message-ID: <20240303135114.1023026-6-lvivier(a)redhat.com>
---
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);
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
We can find the same function to compute the IPv4 header
checksum in tcp.c, udp.c and tap.c
Use the function defined for tap.c, csum_ip4_header(), but
with the code used in tcp.c and udp.c as it doesn't need a fully
initialiazed IPv4 header, only protocol, tot_len, saddr and daddr.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-7-lvivier(a)redhat.com>
---
checksum.c | 24 +++++++++++++++++++-----
checksum.h | 3 ++-
tap.c | 2 +-
tcp.c | 24 +++---------------------
udp.c | 20 ++------------------
5 files changed, 27 insertions(+), 46 deletions(-)
diff --git a/checksum.c b/checksum.c
index 643957b5..1ac79758 100644
--- a/checksum.c
+++ b/checksum.c
@@ -57,6 +57,7 @@
#include <linux/icmpv6.h>
#include "util.h"
+#include "ip.h"
#include "checksum.h"
/* Checksums are optional for UDP over IPv4, so we usually just set
@@ -114,13 +115,26 @@ uint16_t csum_fold(uint32_t sum)
}
/**
- * csum_ip4_header() - Calculate and set IPv4 header checksum
- * @ip4h: IPv4 header
+ * csum_ip4_header() - Calculate IPv4 header checksum
+ * @tot_len: IPv4 payload length (data + IP header, network order)
+ * @protocol: Protocol number (network order)
+ * @saddr: IPv4 source address (network order)
+ * @daddr: IPv4 destination address (network order)
+ *
+ * Return: 16-bit folded sum of the IPv4 header
*/
-void csum_ip4_header(struct iphdr *ip4h)
+uint16_t csum_ip4_header(uint16_t tot_len, uint8_t protocol,
+ struct in_addr saddr, struct in_addr daddr)
{
- ip4h->check = 0;
- ip4h->check = csum(ip4h, (size_t)ip4h->ihl * 4, 0);
+ uint32_t sum = L2_BUF_IP4_PSUM(protocol);
+
+ sum += tot_len;
+ sum += (saddr.s_addr >> 16) & 0xffff;
+ sum += saddr.s_addr & 0xffff;
+ sum += (daddr.s_addr >> 16) & 0xffff;
+ sum += daddr.s_addr & 0xffff;
+
+ return ~csum_fold(sum);
}
/**
diff --git a/checksum.h b/checksum.h
index cb80ab38..996f456b 100644
--- a/checksum.h
+++ b/checksum.h
@@ -13,7 +13,8 @@ struct icmp6hdr;
uint32_t sum_16b(const void *buf, size_t len);
uint16_t csum_fold(uint32_t sum);
uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init);
-void csum_ip4_header(struct iphdr *ip4h);
+uint16_t csum_ip4_header(uint16_t tot_len, uint8_t protocol,
+ struct in_addr saddr, struct in_addr daddr);
void csum_udp4(struct udphdr *udp4hr,
struct in_addr saddr, struct in_addr daddr,
const void *payload, size_t len);
diff --git a/tap.c b/tap.c
index d35d8944..f971461c 100644
--- a/tap.c
+++ b/tap.c
@@ -161,7 +161,7 @@ static void *tap_push_ip4h(char *buf, struct in_addr src, struct
in_addr dst,
ip4h->protocol = proto;
ip4h->saddr = src.s_addr;
ip4h->daddr = dst.s_addr;
- csum_ip4_header(ip4h);
+ ip4h->check = csum_ip4_header(ip4h->tot_len, proto, src, dst);
return ip4h + 1;
}
diff --git a/tcp.c b/tcp.c
index e0588f92..7fb9dba9 100644
--- a/tcp.c
+++ b/tcp.c
@@ -935,23 +935,6 @@ static void tcp_sock_set_bufsize(const struct ctx *c, int s)
trace("TCP: failed to set SO_SNDBUF to %i", v);
}
-/**
- * tcp_update_check_ip4() - Update IPv4 with variable parts from stored one
- * @buf: L2 packet buffer with final IPv4 header
- */
-static void tcp_update_check_ip4(struct tcp4_l2_buf_t *buf)
-{
- uint32_t sum = L2_BUF_IP4_PSUM(IPPROTO_TCP);
-
- sum += buf->iph.tot_len;
- sum += (buf->iph.saddr >> 16) & 0xffff;
- sum += buf->iph.saddr & 0xffff;
- sum += (buf->iph.daddr >> 16) & 0xffff;
- sum += buf->iph.daddr & 0xffff;
-
- buf->iph.check = (uint16_t)~csum_fold(sum);
-}
-
/**
* tcp_update_check_tcp4() - Update TCP checksum from stored one
* @buf: L2 packet buffer with final IPv4 header
@@ -1394,10 +1377,9 @@ do { \
b->iph.saddr = a4->s_addr;
b->iph.daddr = c->ip4.addr_seen.s_addr;
- if (check)
- b->iph.check = *check;
- else
- tcp_update_check_ip4(b);
+ b->iph.check = check ? *check :
+ csum_ip4_header(b->iph.tot_len, IPPROTO_TCP,
+ *a4, c->ip4.addr_seen);
SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq);
diff --git a/udp.c b/udp.c
index 2b41a1bd..fb8373be 100644
--- a/udp.c
+++ b/udp.c
@@ -275,23 +275,6 @@ static void udp_invert_portmap(struct udp_fwd_ports *fwd)
}
}
-/**
- * udp_update_check4() - Update checksum with variable parts from stored one
- * @buf: L2 packet buffer with final IPv4 header
- */
-static void udp_update_check4(struct udp4_l2_buf_t *buf)
-{
- uint32_t sum = L2_BUF_IP4_PSUM(IPPROTO_UDP);
-
- sum += buf->iph.tot_len;
- sum += (buf->iph.saddr >> 16) & 0xffff;
- sum += buf->iph.saddr & 0xffff;
- sum += (buf->iph.daddr >> 16) & 0xffff;
- sum += buf->iph.daddr & 0xffff;
-
- buf->iph.check = (uint16_t)~csum_fold(sum);
-}
-
/**
* udp_update_l2_buf() - Update L2 buffers with Ethernet and IPv4 addresses
* @eth_d: Ethernet destination address, NULL if unchanged
@@ -619,7 +602,8 @@ static size_t udp_update_hdr4(const struct ctx *c, int n, in_port_t
dstport,
}
b->iph.saddr = src->s_addr;
- udp_update_check4(b);
+ b->iph.check = csum_ip4_header(b->iph.tot_len, IPPROTO_UDP,
+ *src, c->ip4.addr_seen);
b->uh.source = b->s_in.sin_port;
b->uh.dest = htons(dstport);
b->uh.len = htons(udp4_l2_mh_sock[n].msg_len + sizeof(b->uh));
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
The TCP and UDP checksums are computed using the data in the TCP/UDP
payload but also some informations in the IP header (protocol,
length, source and destination addresses).
We add two functions, proto_ipv4_header_psum() and
proto_ipv6_header_psum(), to compute the checksum of the IP
header part.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Message-ID: <20240303135114.1023026-8-lvivier(a)redhat.com>
---
checksum.c | 67 ++++++++++++++++++++++++++++++++++++++++++------------
checksum.h | 5 ++++
tcp.c | 50 +++++++++++++++++++---------------------
udp.c | 18 ++++++++-------
4 files changed, 90 insertions(+), 50 deletions(-)
diff --git a/checksum.c b/checksum.c
index 1ac79758..f8a7b539 100644
--- a/checksum.c
+++ b/checksum.c
@@ -137,6 +137,29 @@ uint16_t csum_ip4_header(uint16_t tot_len, uint8_t protocol,
return ~csum_fold(sum);
}
+/**
+ * proto_ipv4_header_psum() - Calculates the partial checksum of an
+ * IPv4 header for UDP or TCP
+ * @tot_len: IPv4 Payload length (host order)
+ * @proto: Protocol number (host order)
+ * @saddr: Source address (network order)
+ * @daddr: Destination address (network order)
+ * Returns: Partial checksum of the IPv4 header
+ */
+uint32_t proto_ipv4_header_psum(uint16_t tot_len, uint8_t protocol,
+ struct in_addr saddr, struct in_addr daddr)
+{
+ uint32_t psum = htons(protocol);
+
+ psum += (saddr.s_addr >> 16) & 0xffff;
+ psum += saddr.s_addr & 0xffff;
+ psum += (daddr.s_addr >> 16) & 0xffff;
+ psum += daddr.s_addr & 0xffff;
+ psum += htons(tot_len);
+
+ return psum;
+}
+
/**
* csum_udp4() - Calculate and set checksum for a UDP over IPv4 packet
* @udp4hr: UDP header, initialised apart from checksum
@@ -153,14 +176,10 @@ void csum_udp4(struct udphdr *udp4hr,
udp4hr->check = 0;
if (UDP4_REAL_CHECKSUMS) {
- /* UNTESTED: if we did want real UDPv4 checksums, this
- * is roughly what we'd need */
- uint32_t psum = csum_fold(saddr.s_addr)
- + csum_fold(daddr.s_addr)
- + htons(len + sizeof(*udp4hr))
- + htons(IPPROTO_UDP);
- /* Add in partial checksum for the UDP header alone */
- psum += sum_16b(udp4hr, sizeof(*udp4hr));
+ uint16_t tot_len = len + sizeof(struct udphdr);
+ uint32_t psum = proto_ipv4_header_psum(tot_len, IPPROTO_UDP,
+ saddr, daddr);
+ psum = csum_unfolded(udp4hr, sizeof(struct udphdr), psum);
udp4hr->check = csum(payload, len, psum);
}
}
@@ -183,6 +202,27 @@ void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t
len)
icmp4hr->checksum = csum(payload, len, psum);
}
+/**
+ * proto_ipv6_header_psum() - Calculates the partial checksum of an
+ * IPv6 header for UDP or TCP
+ * @payload_len: IPv6 payload length (host order)
+ * @proto: Protocol number (host order)
+ * @saddr: Source address (network order)
+ * @daddr: Destination address (network order)
+ * Returns: Partial checksum of the IPv6 header
+ */
+uint32_t proto_ipv6_header_psum(uint16_t payload_len, uint8_t protocol,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr)
+{
+ uint32_t sum = htons(protocol) + htons(payload_len);
+
+ sum += sum_16b(saddr, sizeof(*saddr));
+ sum += sum_16b(daddr, sizeof(*daddr));
+
+ return sum;
+}
+
/**
* csum_udp6() - Calculate and set checksum for a UDP over IPv6 packet
* @udp6hr: UDP header, initialised apart from checksum
@@ -193,14 +233,11 @@ void csum_udp6(struct udphdr *udp6hr,
const struct in6_addr *saddr, const struct in6_addr *daddr,
const void *payload, size_t len)
{
- /* Partial checksum for the pseudo-IPv6 header */
- uint32_t psum = sum_16b(saddr, sizeof(*saddr)) +
- sum_16b(daddr, sizeof(*daddr)) +
- htons(len + sizeof(*udp6hr)) + htons(IPPROTO_UDP);
-
+ uint32_t psum = proto_ipv6_header_psum(len + sizeof(struct udphdr),
+ IPPROTO_UDP, saddr, daddr);
udp6hr->check = 0;
- /* Add in partial checksum for the UDP header alone */
- psum += sum_16b(udp6hr, sizeof(*udp6hr));
+
+ psum = csum_unfolded(udp6hr, sizeof(struct udphdr), psum);
udp6hr->check = csum(payload, len, psum);
}
diff --git a/checksum.h b/checksum.h
index 996f456b..0f396767 100644
--- a/checksum.h
+++ b/checksum.h
@@ -15,10 +15,15 @@ uint16_t csum_fold(uint32_t sum);
uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init);
uint16_t csum_ip4_header(uint16_t tot_len, uint8_t protocol,
struct in_addr saddr, struct in_addr daddr);
+uint32_t proto_ipv4_header_psum(uint16_t tot_len, uint8_t protocol,
+ struct in_addr saddr, struct in_addr daddr);
void csum_udp4(struct udphdr *udp4hr,
struct in_addr saddr, struct in_addr daddr,
const void *payload, size_t len);
void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len);
+uint32_t proto_ipv6_header_psum(uint16_t payload_len, uint8_t protocol,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr);
void csum_udp6(struct udphdr *udp6hr,
const struct in6_addr *saddr, const struct in6_addr *daddr,
const void *payload, size_t len);
diff --git a/tcp.c b/tcp.c
index 7fb9dba9..a7156ee1 100644
--- a/tcp.c
+++ b/tcp.c
@@ -937,41 +937,33 @@ static void tcp_sock_set_bufsize(const struct ctx *c, int s)
/**
* tcp_update_check_tcp4() - Update TCP checksum from stored one
- * @buf: L2 packet buffer with final IPv4 header
+ * @iph: IPv4 header
+ * @th: TCP header followed by TCP payload
*/
-static void tcp_update_check_tcp4(struct tcp4_l2_buf_t *buf)
+static void tcp_update_check_tcp4(const struct iphdr *iph, struct tcphdr *th)
{
- uint16_t tlen = ntohs(buf->iph.tot_len) - 20;
- uint32_t sum = htons(IPPROTO_TCP);
+ uint16_t tlen = ntohs(iph->tot_len) - sizeof(struct iphdr);
+ struct in_addr saddr = { .s_addr = iph->saddr };
+ struct in_addr daddr = { .s_addr = iph->daddr };
+ uint32_t sum = proto_ipv4_header_psum(tlen, IPPROTO_TCP, saddr, daddr);
- sum += (buf->iph.saddr >> 16) & 0xffff;
- sum += buf->iph.saddr & 0xffff;
- sum += (buf->iph.daddr >> 16) & 0xffff;
- sum += buf->iph.daddr & 0xffff;
- sum += htons(ntohs(buf->iph.tot_len) - 20);
-
- buf->th.check = 0;
- buf->th.check = csum(&buf->th, tlen, sum);
+ th->check = 0;
+ th->check = csum(th, tlen, sum);
}
/**
* tcp_update_check_tcp6() - Calculate TCP checksum for IPv6
- * @buf: L2 packet buffer with final IPv6 header
+ * @ip6h: IPv6 header
+ * @th: TCP header followed by TCP payload
*/
-static void tcp_update_check_tcp6(struct tcp6_l2_buf_t *buf)
+static void tcp_update_check_tcp6(struct ipv6hdr *ip6h, struct tcphdr *th)
{
- int len = ntohs(buf->ip6h.payload_len) + sizeof(struct ipv6hdr);
-
- buf->ip6h.hop_limit = IPPROTO_TCP;
- buf->ip6h.version = 0;
- buf->ip6h.nexthdr = 0;
+ uint16_t payload_len = ntohs(ip6h->payload_len);
+ uint32_t sum = proto_ipv6_header_psum(payload_len, IPPROTO_TCP,
+ &ip6h->saddr, &ip6h->daddr);
- buf->th.check = 0;
- buf->th.check = csum(&buf->ip6h, len, 0);
-
- buf->ip6h.hop_limit = 255;
- buf->ip6h.version = 6;
- buf->ip6h.nexthdr = IPPROTO_TCP;
+ th->check = 0;
+ th->check = csum(th, payload_len, sum);
}
/**
@@ -1383,7 +1375,7 @@ do { \
SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq);
- tcp_update_check_tcp4(b);
+ tcp_update_check_tcp4(&b->iph, &b->th);
tlen = tap_iov_len(c, &b->taph, ip_len);
} else {
@@ -1402,7 +1394,11 @@ do { \
SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq);
- tcp_update_check_tcp6(b);
+ tcp_update_check_tcp6(&b->ip6h, &b->th);
+
+ b->ip6h.hop_limit = 255;
+ b->ip6h.version = 6;
+ b->ip6h.nexthdr = IPPROTO_TCP;
b->ip6h.flow_lbl[0] = (conn->sock >> 16) & 0xf;
b->ip6h.flow_lbl[1] = (conn->sock >> 8) & 0xff;
diff --git a/udp.c b/udp.c
index fb8373be..2fd67925 100644
--- a/udp.c
+++ b/udp.c
@@ -625,6 +625,7 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t
dstport,
{
struct udp6_l2_buf_t *b = &udp6_l2_buf[n];
const struct in6_addr *src, *dst;
+ uint16_t payload_len;
in_port_t src_port;
size_t ip_len;
@@ -634,7 +635,8 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t
dstport,
ip_len = udp6_l2_mh_sock[n].msg_len + sizeof(b->ip6h) + sizeof(b->uh);
- b->ip6h.payload_len = htons(udp6_l2_mh_sock[n].msg_len + sizeof(b->uh));
+ payload_len = udp6_l2_mh_sock[n].msg_len + sizeof(b->uh);
+ b->ip6h.payload_len = htons(payload_len);
if (IN6_IS_ADDR_LINKLOCAL(src)) {
dst = &c->ip6.addr_ll_seen;
@@ -670,17 +672,17 @@ static size_t udp_update_hdr6(const struct ctx *c, int n, in_port_t
dstport,
}
b->ip6h.daddr = *dst;
b->ip6h.saddr = *src;
+ b->ip6h.version = 6;
+ b->ip6h.nexthdr = IPPROTO_UDP;
+ b->ip6h.hop_limit = 255;
b->uh.source = b->s_in6.sin6_port;
b->uh.dest = htons(dstport);
b->uh.len = b->ip6h.payload_len;
-
- b->ip6h.hop_limit = IPPROTO_UDP;
- b->ip6h.version = b->ip6h.nexthdr = b->uh.check = 0;
- b->uh.check = csum(&b->ip6h, ip_len, 0);
- b->ip6h.version = 6;
- b->ip6h.nexthdr = IPPROTO_UDP;
- b->ip6h.hop_limit = 255;
+ b->uh.check = 0;
+ b->uh.check = csum(&b->uh, payload_len,
+ proto_ipv6_header_psum(payload_len, IPPROTO_UDP,
+ src, dst));
return tap_iov_len(c, &b->taph, ip_len);
}
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
Use ethhdr rather than tap_hdr.
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-9-lvivier(a)redhat.com>
---
tap.c | 10 +++++-----
tap.h | 2 +-
tcp.c | 8 ++++----
udp.c | 4 ++--
4 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/tap.c b/tap.c
index f971461c..c7b93726 100644
--- a/tap.c
+++ b/tap.c
@@ -419,18 +419,18 @@ size_t tap_send_frames(const struct ctx *c, const struct iovec *iov,
size_t n)
}
/**
- * tap_update_mac() - Update tap L2 header with new Ethernet addresses
- * @taph: Tap headers to update
+ * eth_update_mac() - Update tap L2 header with new Ethernet addresses
+ * @eh: Ethernet headers to update
* @eth_d: Ethernet destination address, NULL if unchanged
* @eth_s: Ethernet source address, NULL if unchanged
*/
-void tap_update_mac(struct tap_hdr *taph,
+void eth_update_mac(struct ethhdr *eh,
const unsigned char *eth_d, const unsigned char *eth_s)
{
if (eth_d)
- memcpy(taph->eh.h_dest, eth_d, sizeof(taph->eh.h_dest));
+ memcpy(eh->h_dest, eth_d, sizeof(eh->h_dest));
if (eth_s)
- memcpy(taph->eh.h_source, eth_s, sizeof(taph->eh.h_source));
+ memcpy(eh->h_source, eth_s, sizeof(eh->h_source));
}
PACKET_POOL_DECL(pool_l4, UIO_MAXIOV, pkt_buf);
diff --git a/tap.h b/tap.h
index 466d9146..437b9aa2 100644
--- a/tap.h
+++ b/tap.h
@@ -74,7 +74,7 @@ void tap_icmp6_send(const struct ctx *c,
const void *in, size_t len);
int tap_send(const struct ctx *c, const void *data, size_t len);
size_t tap_send_frames(const struct ctx *c, const struct iovec *iov, size_t n);
-void tap_update_mac(struct tap_hdr *taph,
+void eth_update_mac(struct ethhdr *eh,
const unsigned char *eth_d, const unsigned char *eth_s);
void tap_listen_handler(struct ctx *c, uint32_t events);
void tap_handler_pasta(struct ctx *c, uint32_t events,
diff --git a/tcp.c b/tcp.c
index a7156ee1..db42d535 100644
--- a/tcp.c
+++ b/tcp.c
@@ -981,10 +981,10 @@ void tcp_update_l2_buf(const unsigned char *eth_d, const unsigned
char *eth_s)
struct tcp4_l2_buf_t *b4 = &tcp4_l2_buf[i];
struct tcp6_l2_buf_t *b6 = &tcp6_l2_buf[i];
- tap_update_mac(&b4->taph, eth_d, eth_s);
- tap_update_mac(&b6->taph, eth_d, eth_s);
- tap_update_mac(&b4f->taph, eth_d, eth_s);
- tap_update_mac(&b6f->taph, eth_d, eth_s);
+ eth_update_mac(&b4->taph.eh, eth_d, eth_s);
+ eth_update_mac(&b6->taph.eh, eth_d, eth_s);
+ eth_update_mac(&b4f->taph.eh, eth_d, eth_s);
+ eth_update_mac(&b6f->taph.eh, eth_d, eth_s);
}
}
diff --git a/udp.c b/udp.c
index 2fd67925..1f46afb2 100644
--- a/udp.c
+++ b/udp.c
@@ -288,8 +288,8 @@ void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char
*eth_s)
struct udp4_l2_buf_t *b4 = &udp4_l2_buf[i];
struct udp6_l2_buf_t *b6 = &udp6_l2_buf[i];
- tap_update_mac(&b4->taph, eth_d, eth_s);
- tap_update_mac(&b6->taph, eth_d, eth_s);
+ eth_update_mac(&b4->taph.eh, eth_d, eth_s);
+ eth_update_mac(&b6->taph.eh, eth_d, eth_s);
}
}
--
2.44.0
From: Laurent Vivier <lvivier(a)redhat.com>
Replace the macro SET_TCP_HEADER_COMMON_V4_V6() by a new function
tcp_fill_header().
Move IPv4 and IPv6 code from tcp_l2_buf_fill_headers() to
tcp_fill_ipv4_header() and tcp_fill_ipv6_header()
Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>
Message-ID: <20240303135114.1023026-10-lvivier(a)redhat.com>
---
tcp.c | 156 +++++++++++++++++++++++++++++++++++++++-------------------
1 file changed, 106 insertions(+), 50 deletions(-)
diff --git a/tcp.c b/tcp.c
index db42d535..d5eedf4d 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1327,6 +1327,108 @@ void tcp_defer_handler(struct ctx *c)
tcp_l2_data_buf_flush(c);
}
+/**
+ * tcp_fill_header() - Fill the TCP header fields for a given TCP segment.
+ *
+ * @th: Pointer to the TCP header structure
+ * @conn: Pointer to the TCP connection structure
+ * @seq: Sequence number
+ */
+static void tcp_fill_header(struct tcphdr *th,
+ const struct tcp_tap_conn *conn, uint32_t seq)
+{
+ th->source = htons(conn->fport);
+ th->dest = htons(conn->eport);
+ th->seq = htonl(seq);
+ th->ack_seq = htonl(conn->seq_ack_to_tap);
+ if (conn->events & ESTABLISHED) {
+ th->window = htons(conn->wnd_to_tap);
+ } else {
+ unsigned wnd = conn->wnd_to_tap << conn->ws_to_tap;
+
+ th->window = htons(MIN(wnd, USHRT_MAX));
+ }
+}
+
+/**
+ * tcp_fill_headers4() - Fill 802.3, IPv4, TCP headers in pre-cooked buffers
+ * @c: Execution context
+ * @conn: Connection pointer
+ * @iph: Pointer to IPv4 header
+ * @th: Pointer to TCP header
+ * @plen: Payload length (including TCP header options)
+ * @check: Checksum, if already known
+ * @seq: Sequence number for this segment
+ *
+ * Return: The total length of the IPv4 packet, host order
+ */
+static size_t tcp_fill_headers4(const struct ctx *c,
+ const struct tcp_tap_conn *conn,
+ struct iphdr *iph, struct tcphdr *th,
+ size_t plen, const uint16_t *check,
+ uint32_t seq)
+{
+ size_t ip_len = plen + sizeof(struct iphdr) + sizeof(struct tcphdr);
+ const struct in_addr *a4 = inany_v4(&conn->faddr);
+
+ ASSERT(a4);
+
+ iph->tot_len = htons(ip_len);
+ iph->saddr = a4->s_addr;
+ iph->daddr = c->ip4.addr_seen.s_addr;
+
+ iph->check = check ? *check :
+ csum_ip4_header(iph->tot_len, IPPROTO_TCP,
+ *a4, c->ip4.addr_seen);
+
+ tcp_fill_header(th, conn, seq);
+
+ tcp_update_check_tcp4(iph, th);
+
+ return ip_len;
+}
+
+/**
+ * tcp_fill_headers6() - Fill 802.3, IPv6, TCP headers in pre-cooked buffers
+ * @c: Execution context
+ * @conn: Connection pointer
+ * @ip6h: Pointer to IPv6 header
+ * @th: Pointer to TCP header
+ * @plen: Payload length (including TCP header options)
+ * @check: Checksum, if already known
+ * @seq: Sequence number for this segment
+ *
+ * Return: The total length of the IPv6 packet, host order
+ */
+static size_t tcp_fill_headers6(const struct ctx *c,
+ const struct tcp_tap_conn *conn,
+ struct ipv6hdr *ip6h, struct tcphdr *th,
+ size_t plen, uint32_t seq)
+{
+ size_t ip_len = plen + sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
+
+ ip6h->payload_len = htons(plen + sizeof(struct tcphdr));
+ ip6h->saddr = conn->faddr.a6;
+ if (IN6_IS_ADDR_LINKLOCAL(&ip6h->saddr))
+ ip6h->daddr = c->ip6.addr_ll_seen;
+ else
+ ip6h->daddr = c->ip6.addr_seen;
+
+ ip6h->hop_limit = 255;
+ ip6h->version = 6;
+ ip6h->nexthdr = IPPROTO_TCP;
+
+ ip6h->flow_lbl[0] = (conn->sock >> 16) & 0xf;
+ ip6h->flow_lbl[1] = (conn->sock >> 8) & 0xff;
+ ip6h->flow_lbl[2] = (conn->sock >> 0) & 0xff;
+
+ tcp_fill_header(th, conn, seq);
+
+ tcp_update_check_tcp6(ip6h, th);
+
+ return ip_len;
+}
+
/**
* tcp_l2_buf_fill_headers() - Fill 802.3, IP, TCP headers in pre-cooked buffers
* @c: Execution context
@@ -1346,67 +1448,21 @@ static size_t tcp_l2_buf_fill_headers(const struct ctx *c,
const struct in_addr *a4 = inany_v4(&conn->faddr);
size_t ip_len, tlen;
-#define SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq) \
-do { \
- b->th.source = htons(conn->fport); \
- b->th.dest = htons(conn->eport); \
- b->th.seq = htonl(seq); \
- b->th.ack_seq = htonl(conn->seq_ack_to_tap); \
- if (conn->events & ESTABLISHED) { \
- b->th.window = htons(conn->wnd_to_tap); \
- } else { \
- unsigned wnd = conn->wnd_to_tap << conn->ws_to_tap; \
- \
- b->th.window = htons(MIN(wnd, USHRT_MAX)); \
- } \
-} while (0)
-
if (a4) {
struct tcp4_l2_buf_t *b = (struct tcp4_l2_buf_t *)p;
- ip_len = plen + sizeof(struct iphdr) + sizeof(struct tcphdr);
- b->iph.tot_len = htons(ip_len);
- b->iph.saddr = a4->s_addr;
- b->iph.daddr = c->ip4.addr_seen.s_addr;
-
- b->iph.check = check ? *check :
- csum_ip4_header(b->iph.tot_len, IPPROTO_TCP,
- *a4, c->ip4.addr_seen);
-
- SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq);
-
- tcp_update_check_tcp4(&b->iph, &b->th);
+ ip_len = tcp_fill_headers4(c, conn, &b->iph, &b->th, plen,
+ check, seq);
tlen = tap_iov_len(c, &b->taph, ip_len);
} else {
struct tcp6_l2_buf_t *b = (struct tcp6_l2_buf_t *)p;
- ip_len = plen + sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
-
- b->ip6h.payload_len = htons(plen + sizeof(struct tcphdr));
- b->ip6h.saddr = conn->faddr.a6;
- if (IN6_IS_ADDR_LINKLOCAL(&b->ip6h.saddr))
- b->ip6h.daddr = c->ip6.addr_ll_seen;
- else
- b->ip6h.daddr = c->ip6.addr_seen;
-
- memset(b->ip6h.flow_lbl, 0, 3);
-
- SET_TCP_HEADER_COMMON_V4_V6(b, conn, seq);
-
- tcp_update_check_tcp6(&b->ip6h, &b->th);
-
- b->ip6h.hop_limit = 255;
- b->ip6h.version = 6;
- b->ip6h.nexthdr = IPPROTO_TCP;
-
- b->ip6h.flow_lbl[0] = (conn->sock >> 16) & 0xf;
- b->ip6h.flow_lbl[1] = (conn->sock >> 8) & 0xff;
- b->ip6h.flow_lbl[2] = (conn->sock >> 0) & 0xff;
+ ip_len = tcp_fill_headers6(c, conn, &b->ip6h, &b->th, plen,
+ seq);
tlen = tap_iov_len(c, &b->taph, ip_len);
}
-#undef SET_TCP_HEADER_COMMON_V4_V6
return tlen;
}
--
2.44.0
On Wed, 6 Mar 2024 15:18:14 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:Stefano, you may have already done this, but I hit the same issue trying to rebase my own code on the vhost-user stuff. This is Laurent's most recent vhost-user part 1 series, but with fixes applied for the cppcheck and clang-tidy regressions introduced.I didn't get to this point yet, so this would help, but I can't apply it like this as it introduces further changes with a Signed-off-by Laurent and not otherwise marked. -- Stefano
On Wed, Mar 06, 2024 at 06:28:51AM +0100, Stefano Brivio wrote:On Wed, 6 Mar 2024 15:18:14 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:Fair point, reposted. -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibsonStefano, you may have already done this, but I hit the same issue trying to rebase my own code on the vhost-user stuff. This is Laurent's most recent vhost-user part 1 series, but with fixes applied for the cppcheck and clang-tidy regressions introduced.I didn't get to this point yet, so this would help, but I can't apply it like this as it introduces further changes with a Signed-off-by Laurent and not otherwise marked.
On Wed, 6 Mar 2024 16:58:59 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:On Wed, Mar 06, 2024 at 06:28:51AM +0100, Stefano Brivio wrote:Thanks a lot, running tests now. -- StefanoOn Wed, 6 Mar 2024 15:18:14 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:Fair point, reposted.Stefano, you may have already done this, but I hit the same issue trying to rebase my own code on the vhost-user stuff. This is Laurent's most recent vhost-user part 1 series, but with fixes applied for the cppcheck and clang-tidy regressions introduced.I didn't get to this point yet, so this would help, but I can't apply it like this as it introduces further changes with a Signed-off-by Laurent and not otherwise marked.