[src/trunk]: src/sys/net Split out sysctl_iflist into sysctl_iflist_if and sy...

[roy <roy%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/12126f0f020f
branches:  trunk
changeset: 817680:12126f0f020f
user:      roy <roy%NetBSD.org@localhost>
date:      Thu Sep 01 19:04:30 2016 +0000

description:
Split out sysctl_iflist into sysctl_iflist_if and sysctl_iflist_addr.
Setup a command and function pointer in one case statement
instead of having a seconary case statement within a loop.
This makes the code much easier to follow, and possibly to add more compat
in the future.

Don't panic when running an old binary without compat support.

diffstat:

 sys/net/rtsock.c |  140 ++++++++++++++++++++++++++++--------------------------
 1 files changed, 72 insertions(+), 68 deletions(-)

diffs (188 lines):

diff -r 857f0a3a3fb4 -r 12126f0f020f sys/net/rtsock.c
--- a/sys/net/rtsock.c  Thu Sep 01 16:30:11 2016 +0000
+++ b/sys/net/rtsock.c  Thu Sep 01 19:04:30 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rtsock.c,v 1.194 2016/08/01 03:15:30 ozaki-r Exp $     */
+/*     $NetBSD: rtsock.c,v 1.195 2016/09/01 19:04:30 roy Exp $ */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.194 2016/08/01 03:15:30 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.195 2016/09/01 19:04:30 roy Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1508,16 +1508,81 @@
 }
 
 static int
+sysctl_iflist_if(struct ifnet *ifp, struct rt_walkarg *w,
+    struct rt_addrinfo *info, size_t len)
+{
+       struct if_xmsghdr *ifm;
+       int error;
+
+       ifm = (struct if_xmsghdr *)w->w_tmem;
+       ifm->ifm_index = ifp->if_index;
+       ifm->ifm_flags = ifp->if_flags;
+       ifm->ifm_data = ifp->if_data;
+       ifm->ifm_addrs = info->rti_addrs;
+       if ((error = copyout(ifm, w->w_where, len)) == 0)
+               w->w_where = (char *)w->w_where + len;
+       return error;
+}
+
+static int
+sysctl_iflist_addr(struct rt_walkarg *w, struct ifaddr *ifa,
+     struct rt_addrinfo *info)
+{
+       int len, error;
+
+       if ((error = rt_msg2(RTM_NEWADDR, info, 0, w, &len)))
+               return error;
+       if (w->w_where && w->w_tmem && w->w_needed <= 0) {
+               struct ifa_xmsghdr *ifam;
+
+               ifam = (struct ifa_xmsghdr *)w->w_tmem;
+               ifam->ifam_index = ifa->ifa_ifp->if_index;
+               ifam->ifam_flags = ifa->ifa_flags;
+               ifam->ifam_metric = ifa->ifa_metric;
+               ifam->ifam_addrs = info->rti_addrs;
+               if ((error = copyout(w->w_tmem, w->w_where, len)) == 0)
+                       w->w_where = (char *)w->w_where + len;
+       }
+       return error;
+}
+
+static int
 sysctl_iflist(int af, struct rt_walkarg *w, int type)
 {
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct  rt_addrinfo info;
-       int     len, error = 0;
+       int     cmd, len, error = 0;
+       int     (*iflist_if)(struct ifnet *, struct rt_walkarg *,
+                            struct rt_addrinfo *, size_t);
        int s;
        struct psref psref;
        int bound = curlwp_bind();
 
+       switch (type) {
+       case NET_RT_IFLIST:
+               cmd = RTM_IFINFO;
+               iflist_if = sysctl_iflist_if;
+               break;
+#ifdef COMPAT_14
+       case NET_RT_OOIFLIST:
+               cmd = RTM_OOIFINFO;
+               iflist_if = compat_14_iflist;
+               break;
+#endif
+#ifdef COMPAT_50
+       case NET_RT_OIFLIST:
+               cmd = RTM_OIFINFO;
+               iflist_if = compat_50_iflist;
+               break;
+#endif
+       default:
+#ifdef DIAGNOSTIC
+               printf("sysctl_iflist\n");
+#endif
+               return EINVAL;
+       }
+
        memset(&info, 0, sizeof(info));
 
        s = pserialize_read_enter();
@@ -1531,60 +1596,12 @@
                pserialize_read_exit(s);
 
                info.rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
-               switch (type) {
-               case NET_RT_IFLIST:
-                       error = rt_msg2(RTM_IFINFO, &info, NULL, w, &len);
-                       break;
-#ifdef COMPAT_14
-               case NET_RT_OOIFLIST:
-                       error = rt_msg2(RTM_OOIFINFO, &info, NULL, w, &len);
-                       break;
-#endif
-#ifdef COMPAT_50
-               case NET_RT_OIFLIST:
-                       error = rt_msg2(RTM_OIFINFO, &info, NULL, w, &len);
-                       break;
-#endif
-               default:
-                       panic("sysctl_iflist(1)");
-               }
-               if (error)
+               if ((error = rt_msg2(cmd, &info, NULL, w, &len)) != 0)
                        goto release_exit;
                info.rti_info[RTAX_IFP] = NULL;
                if (w->w_where && w->w_tmem && w->w_needed <= 0) {
-                       switch (type) {
-                       case NET_RT_IFLIST: {
-                               struct if_xmsghdr *ifm;
-
-                               ifm = (struct if_xmsghdr *)w->w_tmem;
-                               ifm->ifm_index = ifp->if_index;
-                               ifm->ifm_flags = ifp->if_flags;
-                               ifm->ifm_data = ifp->if_data;
-                               ifm->ifm_addrs = info.rti_addrs;
-                               error = copyout(ifm, w->w_where, len);
-                               if (error)
-                                       goto release_exit;
-                               w->w_where = (char *)w->w_where + len;
-                               break;
-                       }
-
-#ifdef COMPAT_14
-                       case NET_RT_OOIFLIST:
-                               error = compat_14_iflist(ifp, w, &info, len);
-                               if (error)
-                                       goto release_exit;
-                               break;
-#endif
-#ifdef COMPAT_50
-                       case NET_RT_OIFLIST:
-                               error = compat_50_iflist(ifp, w, &info, len);
-                               if (error)
-                                       goto release_exit;
-                               break;
-#endif
-                       default:
-                               panic("sysctl_iflist(2)");
-                       }
+                       if ((error = iflist_if(ifp, w, &info, len)) != 0)
+                               goto release_exit;
                }
                IFADDR_READER_FOREACH(ifa, ifp) {
                        if (af && af != ifa->ifa_addr->sa_family)
@@ -1592,21 +1609,8 @@
                        info.rti_info[RTAX_IFA] = ifa->ifa_addr;
                        info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
                        info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
-                       if ((error = rt_msg2(RTM_NEWADDR, &info, 0, w, &len)))
+                       if ((error = sysctl_iflist_addr(w, ifa, &info)) != 0)
                                goto release_exit;
-                       if (w->w_where && w->w_tmem && w->w_needed <= 0) {
-                               struct ifa_xmsghdr *ifam;
-
-                               ifam = (struct ifa_xmsghdr *)w->w_tmem;
-                               ifam->ifam_index = ifa->ifa_ifp->if_index;
-                               ifam->ifam_flags = ifa->ifa_flags;
-                               ifam->ifam_metric = ifa->ifa_metric;
-                               ifam->ifam_addrs = info.rti_addrs;
-                               error = copyout(w->w_tmem, w->w_where, len);
-                               if (error)
-                                       goto release_exit;
-                               w->w_where = (char *)w->w_where + len;
-                       }
                }
                info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
                    info.rti_info[RTAX_BRD] = NULL;