git: 7f1009d61c3e - stable/15 - net/if.c: Add fib-aware ifa_ifwithaddr()

The branch stable/15 has been updated by bnovkov:

URL: https://cgit.FreeBSD.org/src/commit/?id=7f1009d61c3e70b34af749d4d7f21c5e152b3baf

commit 7f1009d61c3e70b34af749d4d7f21c5e152b3baf
Author:     Pouria Mousavizadeh Tehrani <pouria@FreeBSD.org>
AuthorDate: 2026-07-17 16:11:42 +0000
Commit:     Bojan Novković <bnovkov@FreeBSD.org>
CommitDate: 2026-08-06 16:18:25 +0000

    net/if.c: Add fib-aware ifa_ifwithaddr()
    
    Add FIB selection logic by introducing ifa_ifwithaddr_fib() to
    support FIB-specific lookups. Then have ifa_ifwithaddr() wrap it
    with RT_ALL_FIBS.
    Also, do the same for ifa_ifwithaddr_check().
    
    Reviewed by:    glebius, bnovkov
    Differential Revision: https://reviews.freebsd.org/D58305
    
    (cherry picked from commit b00d30950cde27eda8f51523a40f2c05a38daac1)
---
 sys/net/if.c     | 29 +++++++++++++++++++++++------
 sys/net/if_var.h |  2 ++
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index ed22bbd8f8da..8ee7d3f3f924 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1817,18 +1817,18 @@ sa_dl_equal(const struct sockaddr *a, const struct sockaddr *b)
 }
 
 /*
- * Locate an interface based on a complete address.
+ * Locate an interface on the specified fib based on a complete address.
  */
-/*ARGSUSED*/
 struct ifaddr *
-ifa_ifwithaddr(const struct sockaddr *addr)
+ifa_ifwithaddr_fib(const struct sockaddr *addr, int fibnum)
 {
 	struct ifnet *ifp;
 	struct ifaddr *ifa;
 
 	NET_EPOCH_ASSERT();
-
 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
+		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
+			continue;
 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 			if (ifa->ifa_addr->sa_family != addr->sa_family)
 				continue;
@@ -1849,18 +1849,35 @@ done:
 	return (ifa);
 }
 
+/*
+ * Locate an interface based on a complete address.
+ */
+struct ifaddr *
+ifa_ifwithaddr(const struct sockaddr *addr)
+{
+
+	return (ifa_ifwithaddr_fib(addr, RT_ALL_FIBS));
+}
+
 int
-ifa_ifwithaddr_check(const struct sockaddr *addr)
+ifa_ifwithaddr_fib_check(const struct sockaddr *addr, int fibnum)
 {
 	struct epoch_tracker et;
 	int rc;
 
 	NET_EPOCH_ENTER(et);
-	rc = (ifa_ifwithaddr(addr) != NULL);
+	rc = (ifa_ifwithaddr_fib(addr, fibnum) != NULL);
 	NET_EPOCH_EXIT(et);
 	return (rc);
 }
 
+int
+ifa_ifwithaddr_check(const struct sockaddr *addr)
+{
+
+	return (ifa_ifwithaddr_fib_check(addr, RT_ALL_FIBS));
+}
+
 /*
  * Locate an interface based on the broadcast address.
  */
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 961259bb0ca1..3d0f0624aed2 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -547,7 +547,9 @@ int	ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
 int	ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
 int	ifa_switch_loopback_route(struct ifaddr *, struct sockaddr *);
 
+struct	ifaddr *ifa_ifwithaddr_fib(const struct sockaddr *, int);
 struct	ifaddr *ifa_ifwithaddr(const struct sockaddr *);
+int		ifa_ifwithaddr_fib_check(const struct sockaddr *, int);
 int		ifa_ifwithaddr_check(const struct sockaddr *);
 struct	ifaddr *ifa_ifwithbroadaddr(const struct sockaddr *, int);
 struct	ifaddr *ifa_ifwithdstaddr(const struct sockaddr *, int);