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Make NFS address selection use fib4_lookup().

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fib4_lookup_nh_ represents pre-epoch generation of fib api,
providing less guarantees over pointer validness and requiring
on-stack data copying.
Switch call to use new fib4_lookup(), allowing to eventually
deprecate old api.

Differential Revision:	https://reviews.freebsd.org/D24977
This commit is contained in:
Alexander V. Chernikov 2020-05-28 07:35:07 +00:00
parent 3553b3007f
commit c74ce5cca3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=361575
1 changed files with 12 additions and 6 deletions
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18
sys/fs/nfsclient/nfs_clport.c
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@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/if_ether.h>
#include <netinet6/ip6_var.h>
#include <net/if_types.h>
#include <net/route/nhop.h>
#include <fs/nfsclient/nfs_kdtrace.h>
@ -976,24 +977,29 @@ nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
#endif
#ifdef INET
if (nmp->nm_nam->sa_family == AF_INET) {
struct epoch_tracker et;
struct nhop_object *nh;
struct sockaddr_in *sin;
struct nhop4_extended nh_ext;
struct in_addr addr = {};
sin = (struct sockaddr_in *)nmp->nm_nam;
NET_EPOCH_ENTER(et);
CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
error = fib4_lookup_nh_ext(fibnum, sin->sin_addr, 0, 0,
&nh_ext);
nh = fib4_lookup(fibnum, sin->sin_addr, 0, NHR_NONE, 0);
CURVNET_RESTORE();
if (error != 0)
if (nh != NULL)
addr = IA_SIN(ifatoia(nh->nh_ifa))->sin_addr;
NET_EPOCH_EXIT(et);
if (nh == NULL)
return (NULL);
if (IN_LOOPBACK(ntohl(nh_ext.nh_src.s_addr))) {
if (IN_LOOPBACK(ntohl(addr.s_addr))) {
/* Ignore loopback addresses */
return (NULL);
}
*isinet6p = 0;
*((struct in_addr *)paddr) = nh_ext.nh_src;
*((struct in_addr *)paddr) = addr;
return (u_int8_t *)paddr;
}