Implement SIOCGIFALIAS.
It is lightweight way to check if an IPv4 address exists. Submitted by: Roy Marples Reviewed by: gnn, melifaro MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D26636
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=366695
@ -28,7 +28,7 @@
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.\" @(#)netintro.4 8.2 (Berkeley) 11/30/93
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.\" $FreeBSD$
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.\"
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.Dd January 26, 2012
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.Dd October 14, 2020
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.Dt NETINTRO 4
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.Os
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.Sh NAME
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@ -349,6 +349,13 @@ multiple masks or destination addresses, and also adopts the
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convention that specification of the default address means
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to delete the first address for the interface belonging to
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the address family in which the original socket was opened.
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.It Dv SIOCGIFALIAS
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This request provides means to get additional addresses
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together with netmask and broadcast/destination from an
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interface.
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It also uses the
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.Vt ifaliasreq
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structure.
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.It Dv SIOCGIFCONF
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Get interface configuration list.
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This request takes an
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@ -72,6 +72,7 @@ __FBSDID("$FreeBSD$");
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static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static void in_socktrim(struct sockaddr_in *);
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static void in_purgemaddrs(struct ifnet *);
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@ -237,6 +238,11 @@ in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
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case SIOCGIFDSTADDR:
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case SIOCGIFNETMASK:
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break;
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case SIOCGIFALIAS:
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sx_xlock(&in_control_sx);
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error = in_gifaddr_ioctl(cmd, data, ifp, td);
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sx_xunlock(&in_control_sx);
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return (error);
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case SIOCDIFADDR:
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sx_xlock(&in_control_sx);
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error = in_difaddr_ioctl(cmd, data, ifp, td);
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@ -649,6 +655,60 @@ in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
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return (0);
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}
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static int
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in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
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{
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struct in_aliasreq *ifra = (struct in_aliasreq *)data;
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const struct sockaddr_in *addr = &ifra->ifra_addr;
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struct epoch_tracker et;
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struct ifaddr *ifa;
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struct in_ifaddr *ia;
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/*
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* ifra_addr must be present and be of INET family.
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*/
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if (addr->sin_len != sizeof(struct sockaddr_in) ||
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addr->sin_family != AF_INET)
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return (EINVAL);
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/*
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* See whether address exist.
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*/
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ia = NULL;
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NET_EPOCH_ENTER(et);
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CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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struct in_ifaddr *it;
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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it = (struct in_ifaddr *)ifa;
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if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
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prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
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ia = it;
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break;
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}
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}
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if (ia == NULL) {
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NET_EPOCH_EXIT(et);
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return (EADDRNOTAVAIL);
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}
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ifra->ifra_mask = ia->ia_sockmask;
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if ((ifp->if_flags & IFF_POINTOPOINT) &&
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ia->ia_dstaddr.sin_family == AF_INET)
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ifra->ifra_dstaddr = ia->ia_dstaddr;
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else if ((ifp->if_flags & IFF_BROADCAST) &&
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ia->ia_broadaddr.sin_family == AF_INET)
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ifra->ifra_broadaddr = ia->ia_broadaddr;
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else
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memset(&ifra->ifra_broadaddr, 0,
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sizeof(ifra->ifra_broadaddr));
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NET_EPOCH_EXIT(et);
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return (0);
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}
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#define rtinitflags(x) \
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((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
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? RTF_HOST : 0)
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@ -84,6 +84,7 @@
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#define SIOCGIFDESCR _IOWR('i', 42, struct ifreq) /* get ifnet descr */
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#define SIOCAIFADDR _IOW('i', 43, struct ifaliasreq)/* add/chg IF alias */
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#define SIOCGIFDATA _IOW('i', 44, struct ifreq) /* get if_data */
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#define SIOCGIFALIAS _IOWR('i', 45, struct ifaliasreq)/* get IF alias */
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#define SIOCADDMULTI _IOW('i', 49, struct ifreq) /* add m'cast addr */
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#define SIOCDELMULTI _IOW('i', 50, struct ifreq) /* del m'cast addr */
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