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netinet6: factor interface addition code to the dedicated function
Summary: Move SIOCAIFADDR_IN6 (current "primary" ioctl to add an IPv6 interface address) handling code to the dedicated in6_addifaddr() function and make it a part of KPI. This allows in-kernel users to add/delete interfaces addresses without relying on ioctl interface. Subscribers: imp, ae, glebius Differential Revision: https://reviews.freebsd.org/D36713
This commit is contained in:
Alexander V. Chernikov
parent
ca7e6d7c29
commit
e437991fc9
@ -252,15 +252,15 @@ in6_control(struct socket *so, u_long cmd, void *data,
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struct in6_ifaddr *ia = NULL;
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struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
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struct sockaddr_in6 *sa6;
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int carp_attached = 0;
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int error;
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u_long ocmd = cmd;
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/*
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* Compat to make pre-10.x ifconfig(8) operable.
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*/
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if (cmd == OSIOCAIFADDR_IN6)
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if (cmd == OSIOCAIFADDR_IN6) {
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cmd = SIOCAIFADDR_IN6;
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ifra->ifra_vhid = 0;
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}
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switch (cmd) {
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case SIOCGETSGCNT_IN6:
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@ -560,142 +560,9 @@ in6_control(struct socket *so, u_long cmd, void *data,
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break;
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case SIOCAIFADDR_IN6:
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{
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struct nd_prefixctl pr0;
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struct nd_prefix *pr;
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/*
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* first, make or update the interface address structure,
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* and link it to the list.
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*/
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if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
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goto out;
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if (ia != NULL) {
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if (ia->ia_ifa.ifa_carp)
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(*carp_detach_p)(&ia->ia_ifa, true);
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ifa_free(&ia->ia_ifa);
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}
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if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
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== NULL) {
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/*
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* this can happen when the user specify the 0 valid
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* lifetime.
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*/
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break;
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}
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if (cmd == ocmd && ifra->ifra_vhid > 0) {
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if (carp_attach_p != NULL)
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error = (*carp_attach_p)(&ia->ia_ifa,
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ifra->ifra_vhid);
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else
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error = EPROTONOSUPPORT;
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if (error)
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goto out;
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else
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carp_attached = 1;
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}
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/*
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* then, make the prefix on-link on the interface.
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* XXX: we'd rather create the prefix before the address, but
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* we need at least one address to install the corresponding
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* interface route, so we configure the address first.
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*/
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/*
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* convert mask to prefix length (prefixmask has already
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* been validated in in6_update_ifa().
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*/
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bzero(&pr0, sizeof(pr0));
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pr0.ndpr_ifp = ifp;
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pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
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NULL);
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if (pr0.ndpr_plen == 128) {
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/* we don't need to install a host route. */
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goto aifaddr_out;
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}
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pr0.ndpr_prefix = ifra->ifra_addr;
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/* apply the mask for safety. */
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IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
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&ifra->ifra_prefixmask.sin6_addr);
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/*
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* XXX: since we don't have an API to set prefix (not address)
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* lifetimes, we just use the same lifetimes as addresses.
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* The (temporarily) installed lifetimes can be overridden by
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* later advertised RAs (when accept_rtadv is non 0), which is
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* an intended behavior.
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*/
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pr0.ndpr_raf_onlink = 1; /* should be configurable? */
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pr0.ndpr_raf_auto =
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((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
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pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
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pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
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/* add the prefix if not yet. */
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if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
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/*
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* nd6_prelist_add will install the corresponding
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* interface route.
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*/
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if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
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if (carp_attached)
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(*carp_detach_p)(&ia->ia_ifa, false);
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goto out;
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}
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}
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/* relate the address to the prefix */
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if (ia->ia6_ndpr == NULL) {
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ia->ia6_ndpr = pr;
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pr->ndpr_addrcnt++;
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/*
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* If this is the first autoconf address from the
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* prefix, create a temporary address as well
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* (when required).
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*/
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if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
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V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
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int e;
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if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
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log(LOG_NOTICE, "in6_control: failed "
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"to create a temporary address, "
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"errno=%d\n", e);
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}
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}
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}
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nd6_prefix_rele(pr);
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/*
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* this might affect the status of autoconfigured addresses,
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* that is, this address might make other addresses detached.
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*/
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pfxlist_onlink_check();
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aifaddr_out:
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/*
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* Try to clear the flag when a new IPv6 address is added
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* onto an IFDISABLED interface and it succeeds.
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*/
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if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
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struct in6_ndireq nd;
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memset(&nd, 0, sizeof(nd));
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nd.ndi.flags = ND_IFINFO(ifp)->flags;
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nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
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if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
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log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
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"SIOCSIFINFO_FLAGS for -ifdisabled "
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"failed.");
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/*
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* Ignore failure of clearing the flag intentionally.
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* The failure means address duplication was detected.
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*/
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}
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error = in6_addifaddr(ifp, ifra, ia);
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ia = NULL;
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break;
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}
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case SIOCDIFADDR_IN6:
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in6_purgeifaddr(ia);
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@ -1324,6 +1191,151 @@ ifa_is_p2p(struct in6_ifaddr *ia)
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return (false);
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}
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int
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in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia)
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{
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struct nd_prefixctl pr0;
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struct nd_prefix *pr;
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int carp_attached = 0;
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int error;
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/*
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* first, make or update the interface address structure,
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* and link it to the list.
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*/
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if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
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goto out;
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if (ia != NULL) {
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if (ia->ia_ifa.ifa_carp)
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(*carp_detach_p)(&ia->ia_ifa, true);
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ifa_free(&ia->ia_ifa);
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}
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if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) {
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/*
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* this can happen when the user specify the 0 valid
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* lifetime.
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*/
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return (0);
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}
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if (ifra->ifra_vhid > 0) {
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if (carp_attach_p != NULL)
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error = (*carp_attach_p)(&ia->ia_ifa,
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ifra->ifra_vhid);
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else
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error = EPROTONOSUPPORT;
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if (error)
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goto out;
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else
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carp_attached = 1;
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}
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/*
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* then, make the prefix on-link on the interface.
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* XXX: we'd rather create the prefix before the address, but
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* we need at least one address to install the corresponding
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* interface route, so we configure the address first.
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*/
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/*
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* convert mask to prefix length (prefixmask has already
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* been validated in in6_update_ifa().
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*/
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bzero(&pr0, sizeof(pr0));
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pr0.ndpr_ifp = ifp;
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pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
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NULL);
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if (pr0.ndpr_plen == 128) {
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/* we don't need to install a host route. */
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goto aifaddr_out;
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}
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pr0.ndpr_prefix = ifra->ifra_addr;
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/* apply the mask for safety. */
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IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
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&ifra->ifra_prefixmask.sin6_addr);
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/*
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* XXX: since we don't have an API to set prefix (not address)
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* lifetimes, we just use the same lifetimes as addresses.
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* The (temporarily) installed lifetimes can be overridden by
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* later advertised RAs (when accept_rtadv is non 0), which is
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* an intended behavior.
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*/
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pr0.ndpr_raf_onlink = 1; /* should be configurable? */
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pr0.ndpr_raf_auto =
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((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
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pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
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pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
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/* add the prefix if not yet. */
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if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
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/*
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* nd6_prelist_add will install the corresponding
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* interface route.
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*/
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if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
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if (carp_attached)
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(*carp_detach_p)(&ia->ia_ifa, false);
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goto out;
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}
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}
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/* relate the address to the prefix */
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if (ia->ia6_ndpr == NULL) {
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ia->ia6_ndpr = pr;
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pr->ndpr_addrcnt++;
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/*
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* If this is the first autoconf address from the
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* prefix, create a temporary address as well
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* (when required).
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*/
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if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
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V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
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int e;
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if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
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log(LOG_NOTICE, "in6_control: failed "
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"to create a temporary address, "
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"errno=%d\n", e);
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}
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}
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}
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nd6_prefix_rele(pr);
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/*
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* this might affect the status of autoconfigured addresses,
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* that is, this address might make other addresses detached.
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*/
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pfxlist_onlink_check();
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aifaddr_out:
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/*
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* Try to clear the flag when a new IPv6 address is added
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* onto an IFDISABLED interface and it succeeds.
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*/
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if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
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struct in6_ndireq nd;
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memset(&nd, 0, sizeof(nd));
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nd.ndi.flags = ND_IFINFO(ifp)->flags;
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nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
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if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
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log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
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"SIOCSIFINFO_FLAGS for -ifdisabled "
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"failed.");
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/*
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* Ignore failure of clearing the flag intentionally.
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* The failure means address duplication was detected.
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*/
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}
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error = 0;
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out:
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if (ia != NULL)
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ifa_free(&ia->ia_ifa);
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return (error);
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}
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void
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in6_purgeaddr(struct ifaddr *ifa)
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{
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@ -889,6 +889,7 @@ int in6_update_ifa(struct ifnet *, struct in6_aliasreq *,
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struct in6_ifaddr *, int);
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void in6_prepare_ifra(struct in6_aliasreq *, const struct in6_addr *,
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const struct in6_addr *);
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int in6_addifaddr(struct ifnet *, struct in6_aliasreq *, struct in6_ifaddr *);
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void in6_purgeaddr(struct ifaddr *);
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void in6_purgeifaddr(struct in6_ifaddr *);
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int in6if_do_dad(struct ifnet *);
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