From: David Gibson <david@gibson.dropbear.id.au>
To: Laurent Vivier <lvivier@redhat.com>
Cc: passt-dev@passt.top
Subject: Re: [PATCH v3 5/9] util: move IP stuff from util.[ch] to ip.[ch]
Date: Mon, 19 Feb 2024 13:59:06 +1100 [thread overview]
Message-ID: <ZdLD-sbNvM6DrOB0@zatzit> (raw)
In-Reply-To: <20240217150725.661467-6-lvivier@redhat.com>
[-- Attachment #1: Type: text/plain, Size: 15912 bytes --]
On Sat, Feb 17, 2024 at 04:07:21PM +0100, Laurent Vivier wrote:
> 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@redhat.com>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>
> Notes:
> v3:
> - rewrap rational
Tangential English usage note. "rationale" is different from
"rational", though they're related. "Rationale" is the noun - "an
explanation of the reason for the thing", "rational" is an adjective -
"sensible, logical, having a rationale".
(Except of course that in maths "rational" is also a noun - "a number
expressible as a ratio").
> - add David's R-b
>
> v2:
> - update rational and comments
>
> Makefile | 8 ++---
> conf.c | 1 +
> dhcp.c | 1 +
> flow.c | 1 +
> icmp.c | 1 +
> ip.c | 72 +++++++++++++++++++++++++++++++++++++++++++
> ip.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> ndp.c | 1 +
> port_fwd.c | 1 +
> qrap.c | 1 +
> tap.c | 1 +
> tcp.c | 1 +
> tcp_splice.c | 1 +
> udp.c | 1 +
> util.c | 55 ---------------------------------
> util.h | 76 ----------------------------------------------
> 16 files changed, 173 insertions(+), 135 deletions(-)
> create mode 100644 ip.c
> create mode 100644 ip.h
>
> diff --git a/Makefile b/Makefile
> index 156398b3844e..e1ebb454bc6b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -45,7 +45,7 @@ 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 icmp.c \
> - igmp.c iov.c isolation.c lineread.c log.c mld.c ndp.c netlink.c \
> + igmp.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 port_fwd.c tap.c tcp.c \
> tcp_splice.c udp.c util.c
> QRAP_SRCS = qrap.c
> @@ -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 \
> - 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 port_fwd.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 port_fwd.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 5e15b665be9c..93bfda331349 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 110772867632..ff4834a3dce9 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 5e94a7a949e5..73d52bda8774 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/icmp.c b/icmp.c
> index 9434fc5a7490..3b85a8578316 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/ip.c b/ip.c
> new file mode 100644
> index 000000000000..2cc7f6548aff
> --- /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@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 000000000000..b2e08bc049f3
> --- /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@redhat.com>
> + */
> +
> +#ifndef IP_H
> +#define IP_H
> +
> +#include <netinet/ip.h>
> +#include <netinet/ip6.h>
> +
> +#define IN4_IS_ADDR_UNSPECIFIED(a) \
> + ((a)->s_addr == htonl_constant(INADDR_ANY))
> +#define IN4_IS_ADDR_BROADCAST(a) \
> + ((a)->s_addr == htonl_constant(INADDR_BROADCAST))
> +#define IN4_IS_ADDR_LOOPBACK(a) \
> + (ntohl((a)->s_addr) >> IN_CLASSA_NSHIFT == IN_LOOPBACKNET)
> +#define IN4_IS_ADDR_MULTICAST(a) \
> + (IN_MULTICAST(ntohl((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 4c85ab8bcaee..c58f4b222b76 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/port_fwd.c b/port_fwd.c
> index 6f6c836c57ad..e1ec31e2232c 100644
> --- a/port_fwd.c
> +++ b/port_fwd.c
> @@ -21,6 +21,7 @@
> #include <stdio.h>
>
> #include "util.h"
> +#include "ip.h"
> #include "port_fwd.h"
> #include "passt.h"
> #include "lineread.h"
> diff --git a/qrap.c b/qrap.c
> index 97f350a4bf0b..d59670621731 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 396dee7eef25..3ea03f720d6d 100644
> --- a/tap.c
> +++ b/tap.c
> @@ -45,6 +45,7 @@
>
> #include "checksum.h"
> #include "util.h"
> +#include "ip.h"
> #include "passt.h"
> #include "arp.h"
> #include "dhcp.h"
> diff --git a/tcp.c b/tcp.c
> index 2ab443d5c3f2..45ef5146729a 100644
> --- a/tcp.c
> +++ b/tcp.c
> @@ -289,6 +289,7 @@
>
> #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 26d32065cd47..66575ca95a1e 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 933f24b81616..56b58bd8b43a 100644
> --- a/udp.c
> +++ b/udp.c
> @@ -112,6 +112,7 @@
>
> #include "checksum.h"
> #include "util.h"
> +#include "ip.h"
> #include "passt.h"
> #include "tap.h"
> #include "pcap.h"
> diff --git a/util.c b/util.c
> index 21b35ff94db1..f73ea1d98a09 100644
> --- a/util.c
> +++ b/util.c
> @@ -30,61 +30,6 @@
> #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 d2320f8cc99a..f7c3dfee9972 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) \
> - ((a)->s_addr == htonl_constant(INADDR_ANY))
> -#define IN4_IS_ADDR_BROADCAST(a) \
> - ((a)->s_addr == htonl_constant(INADDR_BROADCAST))
> -#define IN4_IS_ADDR_LOOPBACK(a) \
> - (ntohl((a)->s_addr) >> IN_CLASSA_NSHIFT == IN_LOOPBACKNET)
> -#define IN4_IS_ADDR_MULTICAST(a) \
> - (IN_MULTICAST(ntohl((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, int af, uint8_t proto,
> const void *bind_addr, const char *ifname, uint16_t port,
> uint32_t data);
--
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/~dgibson
[-- Attachment #2: signature.asc --]
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next prev parent reply other threads:[~2024-02-19 2:59 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-17 15:07 [PATCH v3 0/9] Add vhost-user support to passt (part 1) Laurent Vivier
2024-02-17 15:07 ` [PATCH v3 1/9] iov: add some functions to manage iovec Laurent Vivier
2024-02-19 2:45 ` David Gibson
2024-02-17 15:07 ` [PATCH v3 2/9] pcap: add pcap_iov() Laurent Vivier
2024-02-19 2:50 ` David Gibson
2024-02-17 15:07 ` [PATCH v3 3/9] checksum: align buffers Laurent Vivier
2024-02-17 15:07 ` [PATCH v3 4/9] checksum: add csum_iov() Laurent Vivier
2024-02-19 2:52 ` David Gibson
2024-02-17 15:07 ` [PATCH v3 5/9] util: move IP stuff from util.[ch] to ip.[ch] Laurent Vivier
2024-02-19 2:59 ` David Gibson [this message]
2024-02-17 15:07 ` [PATCH v3 6/9] checksum: use csum_ip4_header() in udp.c and tcp.c Laurent Vivier
2024-02-19 3:01 ` David Gibson
2024-02-29 16:24 ` Stefano Brivio
2024-02-29 23:10 ` David Gibson
2024-03-01 7:58 ` Stefano Brivio
2024-03-01 12:23 ` David Gibson
2024-03-04 17:04 ` Stefano Brivio
2024-02-17 15:07 ` [PATCH v3 7/9] checksum: introduce functions to compute the header part checksum for TCP/UDP Laurent Vivier
2024-02-19 3:08 ` David Gibson
2024-02-28 13:26 ` Laurent Vivier
2024-02-29 0:38 ` David Gibson
2024-02-29 7:05 ` Stefano Brivio
2024-02-29 8:49 ` David Gibson
2024-02-29 8:56 ` Stefano Brivio
2024-02-29 14:15 ` Stefano Brivio
2024-02-29 23:09 ` David Gibson
2024-03-01 6:56 ` Stefano Brivio
2024-03-04 1:54 ` David Gibson
2024-03-04 11:00 ` Stefano Brivio
2024-03-04 22:47 ` Stefano Brivio
2024-03-06 5:09 ` David Gibson
2024-03-08 0:08 ` Stefano Brivio
2024-03-08 1:20 ` David Gibson
2024-02-17 15:07 ` [PATCH v3 8/9] tap: make tap_update_mac() generic Laurent Vivier
2024-02-17 15:07 ` [PATCH v3 9/9] tcp: Introduce ipv4_fill_headers()/ipv6_fill_headers() Laurent Vivier
2024-02-19 3:14 ` David Gibson
2024-02-29 16:29 ` Stefano Brivio
2024-02-29 16:31 ` [PATCH v3 0/9] Add vhost-user support to passt (part 1) Stefano Brivio
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