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freebsd-dev/sys/kern/uipc_debug.c
Sean Bruno 1a43cff92a Load balance sockets with new SO_REUSEPORT_LB option. 
This patch adds a new socket option, SO_REUSEPORT_LB, which allow multiple
programs or threads to bind to the same port and incoming connections will be
load balanced using a hash function.

Most of the code was copied from a similar patch for DragonflyBSD.

However, in DragonflyBSD, load balancing is a global on/off setting and can not
be set per socket. This patch allows for simultaneous use of both the current
SO_REUSEPORT and the new SO_REUSEPORT_LB options on the same system.

Required changes to structures:
Globally change so_options from 16 to 32 bit value to allow for more options.
Add hashtable in pcbinfo to hold all SO_REUSEPORT_LB sockets.

Limitations:
As DragonflyBSD, a load balance group is limited to 256 pcbs (256 programs or
threads sharing the same socket).

This is a substantially different contribution as compared to its original
incarnation at svn r332894 and reverted at svn r332967.  Thanks to rwatson@
for the substantive feedback that is included in this commit.

Submitted by:	Johannes Lundberg <johalun0@gmail.com>
Obtained from:	DragonflyBSD
Relnotes:	Yes
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D11003
2018-06-06 15:45:57 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2007 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Debugger routines relating to sockets, protocols, etc, for use in DDB.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#ifdef DDB
#include <ddb/ddb.h>
static void
db_print_sotype(short so_type)
{
switch (so_type) {
case SOCK_STREAM:
db_printf("SOCK_STREAM");
break;
case SOCK_DGRAM:
db_printf("SOCK_DGRAM");
break;
case SOCK_RAW:
db_printf("SOCK_RAW");
break;
case SOCK_RDM:
db_printf("SOCK_RDM");
break;
case SOCK_SEQPACKET:
db_printf("SOCK_SEQPACKET");
break;
default:
db_printf("unknown");
break;
}
}
static void
db_print_sooptions(int so_options)
{
int comma;
comma = 0;
if (so_options & SO_DEBUG) {
db_printf("%sSO_DEBUG", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_ACCEPTCONN) {
db_printf("%sSO_ACCEPTCONN", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_REUSEADDR) {
db_printf("%sSO_REUSEADDR", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_KEEPALIVE) {
db_printf("%sSO_KEEPALIVE", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_DONTROUTE) {
db_printf("%sSO_DONTROUTE", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_BROADCAST) {
db_printf("%sSO_BROADCAST", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_USELOOPBACK) {
db_printf("%sSO_USELOOPBACK", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_LINGER) {
db_printf("%sSO_LINGER", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_OOBINLINE) {
db_printf("%sSO_OOBINLINE", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_REUSEPORT) {
db_printf("%sSO_REUSEPORT", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_REUSEPORT_LB) {
db_printf("%sSO_REUSEPORT_LB", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_TIMESTAMP) {
db_printf("%sSO_TIMESTAMP", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_NOSIGPIPE) {
db_printf("%sSO_NOSIGPIPE", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_ACCEPTFILTER) {
db_printf("%sSO_ACCEPTFILTER", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_BINTIME) {
db_printf("%sSO_BINTIME", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_NO_OFFLOAD) {
db_printf("%sSO_NO_OFFLOAD", comma ? ", " : "");
comma = 1;
}
if (so_options & SO_NO_DDP) {
db_printf("%sSO_NO_DDP", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_sostate(short so_state)
{
int comma;
comma = 0;
if (so_state & SS_NOFDREF) {
db_printf("%sSS_NOFDREF", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_ISCONNECTED) {
db_printf("%sSS_ISCONNECTED", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_ISCONNECTING) {
db_printf("%sSS_ISCONNECTING", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_ISDISCONNECTING) {
db_printf("%sSS_ISDISCONNECTING", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_NBIO) {
db_printf("%sSS_NBIO", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_ASYNC) {
db_printf("%sSS_ASYNC", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_ISCONFIRMING) {
db_printf("%sSS_ISCONFIRMING", comma ? ", " : "");
comma = 1;
}
if (so_state & SS_PROTOREF) {
db_printf("%sSS_PROTOREF", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_soqstate(int so_qstate)
{
int comma;
comma = 0;
if (so_qstate & SQ_INCOMP) {
db_printf("%sSQ_INCOMP", comma ? ", " : "");
comma = 1;
}
if (so_qstate & SQ_COMP) {
db_printf("%sSQ_COMP", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_sbstate(short sb_state)
{
int comma;
comma = 0;
if (sb_state & SBS_CANTSENDMORE) {
db_printf("%sSBS_CANTSENDMORE", comma ? ", " : "");
comma = 1;
}
if (sb_state & SBS_CANTRCVMORE) {
db_printf("%sSBS_CANTRCVMORE", comma ? ", " : "");
comma = 1;
}
if (sb_state & SBS_RCVATMARK) {
db_printf("%sSBS_RCVATMARK", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_indent(int indent)
{
int i;
for (i = 0; i < indent; i++)
db_printf(" ");
}
static void
db_print_domain(struct domain *d, const char *domain_name, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", domain_name, d);
indent += 2;
db_print_indent(indent);
db_printf("dom_family: %d ", d->dom_family);
db_printf("dom_name: %s\n", d->dom_name);
db_print_indent(indent);
db_printf("dom_init: %p ", d->dom_init);
db_printf("dom_externalize: %p ", d->dom_externalize);
db_printf("dom_dispose: %p\n", d->dom_dispose);
db_print_indent(indent);
db_printf("dom_protosw: %p ", d->dom_protosw);
db_printf("dom_next: %p\n", d->dom_next);
db_print_indent(indent);
db_printf("dom_rtattach: %p ", d->dom_rtattach);
db_print_indent(indent);
db_printf("dom_ifattach: %p ", d->dom_ifattach);
db_printf("dom_ifdetach: %p\n", d->dom_ifdetach);
}
static void
db_print_prflags(short pr_flags)
{
int comma;
comma = 0;
if (pr_flags & PR_ATOMIC) {
db_printf("%sPR_ATOMIC", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_ADDR) {
db_printf("%sPR_ADDR", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_CONNREQUIRED) {
db_printf("%sPR_CONNREQUIRED", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_WANTRCVD) {
db_printf("%sPR_WANTRCVD", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_RIGHTS) {
db_printf("%sPR_RIGHTS", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_IMPLOPCL) {
db_printf("%sPR_IMPLOPCL", comma ? ", " : "");
comma = 1;
}
if (pr_flags & PR_LASTHDR) {
db_printf("%sPR_LASTHDR", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_protosw(struct protosw *pr, const char *prname, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", prname, pr);
indent += 2;
db_print_indent(indent);
db_printf("pr_type: %d ", pr->pr_type);
db_printf("pr_domain: %p\n", pr->pr_domain);
if (pr->pr_domain != NULL)
db_print_domain(pr->pr_domain, "pr_domain", indent);
db_print_indent(indent);
db_printf("pr_protocol: %d\n", pr->pr_protocol);
db_print_indent(indent);
db_printf("pr_flags: %d (", pr->pr_flags);
db_print_prflags(pr->pr_flags);
db_printf(")\n");
db_print_indent(indent);
db_printf("pr_input: %p ", pr->pr_input);
db_printf("pr_output: %p ", pr->pr_output);
db_printf("pr_ctlinput: %p\n", pr->pr_ctlinput);
db_print_indent(indent);
db_printf("pr_ctloutput: %p ", pr->pr_ctloutput);
db_printf("pr_init: %p\n", pr->pr_init);
db_print_indent(indent);
db_printf("pr_fasttimo: %p ", pr->pr_fasttimo);
db_printf("pr_slowtimo: %p ", pr->pr_slowtimo);
db_printf("pr_drain: %p\n", pr->pr_drain);
}
static void
db_print_sbflags(short sb_flags)
{
int comma;
comma = 0;
if (sb_flags & SB_WAIT) {
db_printf("%sSB_WAIT", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_SEL) {
db_printf("%sSB_SEL", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_ASYNC) {
db_printf("%sSB_ASYNC", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_UPCALL) {
db_printf("%sSB_UPCALL", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_NOINTR) {
db_printf("%sSB_NOINTR", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_AIO) {
db_printf("%sSB_AIO", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_KNOTE) {
db_printf("%sSB_KNOTE", comma ? ", " : "");
comma = 1;
}
if (sb_flags & SB_AUTOSIZE) {
db_printf("%sSB_AUTOSIZE", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_sockbuf(struct sockbuf *sb, const char *sockbufname, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", sockbufname, sb);
indent += 2;
db_print_indent(indent);
db_printf("sb_state: 0x%x (", sb->sb_state);
db_print_sbstate(sb->sb_state);
db_printf(")\n");
db_print_indent(indent);
db_printf("sb_mb: %p ", sb->sb_mb);
db_printf("sb_mbtail: %p ", sb->sb_mbtail);
db_printf("sb_lastrecord: %p\n", sb->sb_lastrecord);
db_print_indent(indent);
db_printf("sb_sndptr: %p ", sb->sb_sndptr);
db_printf("sb_sndptroff: %u\n", sb->sb_sndptroff);
db_print_indent(indent);
db_printf("sb_acc: %u ", sb->sb_acc);
db_printf("sb_ccc: %u ", sb->sb_ccc);
db_printf("sb_hiwat: %u ", sb->sb_hiwat);
db_printf("sb_mbcnt: %u ", sb->sb_mbcnt);
db_printf("sb_mbmax: %u\n", sb->sb_mbmax);
db_print_indent(indent);
db_printf("sb_mcnt: %u ", sb->sb_mcnt);
db_printf("sb_ccnt: %u ", sb->sb_ccnt);
db_printf("sb_ctl: %u ", sb->sb_ctl);
db_printf("sb_lowat: %d ", sb->sb_lowat);
db_printf("sb_timeo: %jd\n", sb->sb_timeo);
db_print_indent(indent);
db_printf("sb_flags: 0x%x (", sb->sb_flags);
db_print_sbflags(sb->sb_flags);
db_printf(")\n");
db_print_indent(indent);
db_printf("sb_aiojobq first: %p\n", TAILQ_FIRST(&sb->sb_aiojobq));
}
static void
db_print_socket(struct socket *so, const char *socketname, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", socketname, so);
indent += 2;
db_print_indent(indent);
db_printf("so_count: %d ", so->so_count);
db_printf("so_type: %d (", so->so_type);
db_print_sotype(so->so_type);
db_printf(")\n");
db_print_indent(indent);
db_printf("so_options: 0x%x (", so->so_options);
db_print_sooptions(so->so_options);
db_printf(")\n");
db_print_indent(indent);
db_printf("so_linger: %d ", so->so_linger);
db_printf("so_state: 0x%x (", so->so_state);
db_print_sostate(so->so_state);
db_printf(")\n");
db_print_indent(indent);
db_printf("so_pcb: %p ", so->so_pcb);
db_printf("so_proto: %p\n", so->so_proto);
if (so->so_proto != NULL)
db_print_protosw(so->so_proto, "so_proto", indent);
db_print_indent(indent);
if (so->so_options & SO_ACCEPTCONN) {
db_printf("sol_incomp first: %p ",
TAILQ_FIRST(&so->sol_incomp));
db_printf("sol_comp first: %p\n", TAILQ_FIRST(&so->sol_comp));
db_printf("sol_qlen: %d ", so->sol_qlen);
db_printf("sol_incqlen: %d ", so->sol_incqlen);
db_printf("sol_qlimit: %d ", so->sol_qlimit);
} else {
db_printf("so_qstate: 0x%x (", so->so_qstate);
db_print_soqstate(so->so_qstate);
db_printf(") ");
db_printf("so_listen: %p ", so->so_listen);
/* so_list skipped */
db_printf("so_timeo: %d ", so->so_timeo);
db_printf("so_error: %d\n", so->so_error);
db_print_indent(indent);
db_printf("so_sigio: %p ", so->so_sigio);
db_printf("so_oobmark: %lu\n", so->so_oobmark);
db_print_sockbuf(&so->so_rcv, "so_rcv", indent);
db_print_sockbuf(&so->so_snd, "so_snd", indent);
}
}
DB_SHOW_COMMAND(socket, db_show_socket)
{
struct socket *so;
if (!have_addr) {
db_printf("usage: show socket <addr>\n");
return;
}
so = (struct socket *)addr;
db_print_socket(so, "socket", 0);
}
DB_SHOW_COMMAND(sockbuf, db_show_sockbuf)
{
struct sockbuf *sb;
if (!have_addr) {
db_printf("usage: show sockbuf <addr>\n");
return;
}
sb = (struct sockbuf *)addr;
db_print_sockbuf(sb, "sockbuf", 0);
}
DB_SHOW_COMMAND(protosw, db_show_protosw)
{
struct protosw *pr;
if (!have_addr) {
db_printf("usage: show protosw <addr>\n");
return;
}
pr = (struct protosw *)addr;
db_print_protosw(pr, "protosw", 0);
}
DB_SHOW_COMMAND(domain, db_show_domain)
{
struct domain *d;
if (!have_addr) {
db_printf("usage: show protosw <addr>\n");
return;
}
d = (struct domain *)addr;
db_print_domain(d, "domain", 0);
}
#endif
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