git: ddd850aa7720 - main - sys/socket.h: Fix AF_MAX
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Date: Tue, 04 Aug 2026 09:55:41 UTC
The branch main has been updated by des:
URL: https://cgit.FreeBSD.org/src/commit/?id=ddd850aa7720f77b6605599655df898b16ed74cc
commit ddd850aa7720f77b6605599655df898b16ed74cc
Author: Dag-Erling Smørgrav <des@FreeBSD.org>
AuthorDate: 2026-08-04 09:55:22 +0000
Commit: Dag-Erling Smørgrav <des@FreeBSD.org>
CommitDate: 2026-08-04 09:55:22 +0000
sys/socket.h: Fix AF_MAX
AF_MAX was always intended to be one more than the greatest allocated
value. Jeff broke this in 2013. Unfortunately, a bunch of people then
decided to adapt to the mistake instead of correcting it.
Fixes: 863c7e45628d (" - Reserve a special AF for SDP. The one we were incorrectly using before was taken by another AF.")
MFC after: 3 days
Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.
Reviewed by: kevans, glebius
Differential Revision: https://reviews.freebsd.org/D58597
---
lib/libifconfig/libifconfig.c | 4 ++--
lib/libifconfig/libifconfig_internal.c | 2 +-
sys/kern/vfs_export.c | 2 +-
sys/net/route/nhop_ctl.c | 2 +-
sys/net/route/route_ddb.c | 2 +-
sys/net/route/route_helpers.c | 4 ++--
sys/net/rtsock.c | 4 ++--
sys/netlink/route/rt.c | 6 +++---
sys/sys/socket.h | 4 +++-
9 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/lib/libifconfig/libifconfig.c b/lib/libifconfig/libifconfig.c
index bc0fcb6021b2..b450c15180db 100644
--- a/lib/libifconfig/libifconfig.c
+++ b/lib/libifconfig/libifconfig.c
@@ -81,7 +81,7 @@ ifconfig_open(void)
if (h == NULL) {
return (NULL);
}
- for (int i = 0; i <= AF_MAX; i++) {
+ for (int i = 0; i < AF_MAX; i++) {
h->sockets[i] = -1;
}
@@ -92,7 +92,7 @@ void
ifconfig_close(ifconfig_handle_t *h)
{
- for (int i = 0; i <= AF_MAX; i++) {
+ for (int i = 0; i < AF_MAX; i++) {
if (h->sockets[i] != -1) {
(void)close(h->sockets[i]);
}
diff --git a/lib/libifconfig/libifconfig_internal.c b/lib/libifconfig/libifconfig_internal.c
index c6c955debb3d..91de1ece59fb 100644
--- a/lib/libifconfig/libifconfig_internal.c
+++ b/lib/libifconfig/libifconfig_internal.c
@@ -78,7 +78,7 @@ int
ifconfig_socket(ifconfig_handle_t *h, const int addressfamily, int *s)
{
- if (addressfamily > AF_MAX) {
+ if (addressfamily >= AF_MAX) {
h->error.errtype = SOCKET;
h->error.errcode = EINVAL;
return (-1);
diff --git a/sys/kern/vfs_export.c b/sys/kern/vfs_export.c
index 6dc4eafc4c60..ca5b66426c5c 100644
--- a/sys/kern/vfs_export.c
+++ b/sys/kern/vfs_export.c
@@ -146,7 +146,7 @@ vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
saddr = (struct sockaddr *) (np + 1);
if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
goto out;
- if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
+ if (saddr->sa_family == AF_UNSPEC || saddr->sa_family >= AF_MAX) {
error = EINVAL;
vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
goto out;
diff --git a/sys/net/route/nhop_ctl.c b/sys/net/route/nhop_ctl.c
index f34721c888b4..59a81ecde4df 100644
--- a/sys/net/route/nhop_ctl.c
+++ b/sys/net/route/nhop_ctl.c
@@ -1339,7 +1339,7 @@ nhops_ifnet_state_changed(struct ifnet *ifp, bool status)
struct nhop_iter iter = { .fibnum = ifp->if_fib, .wlock = true };
bool nhops_changed;
- for (iter.family = 1; iter.family <= AF_MAX; iter.family++) {
+ for (iter.family = 1; iter.family < AF_MAX; iter.family++) {
/*
* By tracking nhop changes, we avoid redundant nhgrp
* recompilation triggered by multiple events.
diff --git a/sys/net/route/route_ddb.c b/sys/net/route/route_ddb.c
index 71bffd98663b..c93370d0a570 100644
--- a/sys/net/route/route_ddb.c
+++ b/sys/net/route/route_ddb.c
@@ -174,7 +174,7 @@ DB_SHOW_COMMAND(routetable, db_show_routetable)
i = lim = addr;
else {
i = 1;
- lim = AF_MAX;
+ lim = AF_MAX - 1;
}
for (; i <= lim; i++) {
diff --git a/sys/net/route/route_helpers.c b/sys/net/route/route_helpers.c
index f09a8bbbd3e5..9160a5872534 100644
--- a/sys/net/route/route_helpers.c
+++ b/sys/net/route/route_helpers.c
@@ -183,7 +183,7 @@ rib_foreach_table_walk(int family, bool wlock, rib_walktree_f_t *wa_f,
continue;
}
- for (int i = 1; i <= AF_MAX; i++)
+ for (int i = 1; i < AF_MAX; i++)
rib_walk_ext(fibnum, i, wlock, wa_f, hook_f, arg);
}
}
@@ -205,7 +205,7 @@ rib_foreach_table_walk_del(int family, rib_filter_f_t *filter_f, void *arg)
continue;
}
- for (int i = 1; i <= AF_MAX; i++)
+ for (int i = 1; i < AF_MAX; i++)
rib_walk_del(fibnum, i, filter_f, arg, 0);
}
}
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 47da83b5561b..fcccbc98470c 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -2623,7 +2623,7 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
} else if (namelen != 3)
return ((namelen < 3) ? EISDIR : ENOTDIR);
af = name[0];
- if (af > AF_MAX)
+ if (af >= AF_MAX)
return (EINVAL);
bzero(&w, sizeof(w));
w.w_op = name[1];
@@ -2647,7 +2647,7 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
case NET_RT_FLAGS:
if (af == 0) { /* dump all tables */
i = 1;
- lim = AF_MAX;
+ lim = AF_MAX - 1;
} else /* dump only one table */
i = lim = af;
diff --git a/sys/netlink/route/rt.c b/sys/netlink/route/rt.c
index fbd96bb9fdc6..bf6ef035eb1d 100644
--- a/sys/netlink/route/rt.c
+++ b/sys/netlink/route/rt.c
@@ -1053,7 +1053,7 @@ rtnl_handle_newroute(struct nlmsghdr *hdr, struct nlpcb *nlp,
}
old_linux_compat(&attrs);
- if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family > AF_MAX) {
+ if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family >= AF_MAX) {
NLMSG_REPORT_ERR_MSG(npt, "invalid fib");
return (EINVAL);
}
@@ -1120,7 +1120,7 @@ rtnl_handle_delroute(struct nlmsghdr *hdr, struct nlpcb *nlp,
}
old_linux_compat(&attrs);
- if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family > AF_MAX) {
+ if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family >= AF_MAX) {
NLMSG_REPORT_ERR_MSG(npt, "invalid fib");
return (EINVAL);
}
@@ -1144,7 +1144,7 @@ rtnl_handle_getroute(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *
return (error);
old_linux_compat(&attrs);
- if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family > AF_MAX) {
+ if (attrs.rta_table >= V_rt_numfibs || attrs.rtm_family >= AF_MAX) {
NLMSG_REPORT_ERR_MSG(npt, "invalid fib");
return (EINVAL);
}
diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index d9c31d572b4f..cc910a2a8efa 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -272,7 +272,9 @@ struct accept_filter_arg {
#define AF_HYPERV 43 /* HyperV sockets */
#define AF_DIVERT 44 /* divert(4) */
#define AF_IPFWLOG 46
-#define AF_MAX 46
+
+#define AF_MAX 47
+
/*
* When allocating a new AF_ constant, please only allocate
* even numbered constants for FreeBSD until 134 as odd numbered AF_