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Further rework netinet6 address handling code:

Browse Source 
* Set ia address/mask values BEFORE attaching to address lists.
Inet6 address assignment is not atomic, so the simplest way to
do this atomically is to fill in ia before attach.
* Validate irfa->ia_addr field before use (we permit ANY sockaddr in old code).
* Do some renamings:
  in6_ifinit -> in6_notify_ifa (interaction with other subsystems is here)
  in6_setup_ifa -> in6_broadcast_ifa (LLE/Multicast/DaD code)
  in6_ifaddloop -> nd6_add_ifa_lle
  in6_ifremloop -> nd6_rem_ifa_lle
* Split working with LLE and route announce code for last two.
Add temporary in6_newaddrmsg() function to mimic current rtsock behaviour.
* Call device SIOCSIFADDR handler IFF we're adding first address.
In IPv4 we have to call it on every address change since ARP record
is installed by arp_ifinit() which is called by given handler.
IPv6 stack, on the opposite is responsible to call nd6_add_ifa_lle() so
there is no reason to call SIOCSIFADDR often.
This commit is contained in:
Alexander V. Chernikov 2014-01-19 16:07:27 +00:00
parent b5a9d8b5a7
commit f6b84910bb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=260882
5 changed files with 167 additions and 135 deletions
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4
sys/netinet/ip_carp.c
View File

@ -964,7 +964,7 @@ carp_ifa_addroute(struct ifaddr *ifa)
case AF_INET6:
ifa_add_loopback_route(ifa,
(struct sockaddr *)&ifatoia6(ifa)->ia_addr);
in6_ifaddloop(ifa);
nd6_add_ifa_lle(ifatoia6(ifa));
break;
#endif
}
@ -995,7 +995,7 @@ carp_ifa_delroute(struct ifaddr *ifa)
case AF_INET6:
ifa_del_loopback_route(ifa,
(struct sockaddr *)&ifatoia6(ifa)->ia_addr);
in6_ifremloop(ifa);
nd6_rem_ifa_lle(ifatoia6(ifa));
break;
#endif
}

235
sys/netinet6/in6.c
View File

@ -133,8 +133,8 @@ const struct in6_addr in6mask128 = IN6MASK128;
const struct sockaddr_in6 sa6_any =
{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
struct sockaddr_in6 *, int);
static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
struct in6_aliasreq *, int);
static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
int (*faithprefix_p)(struct in6_addr *);
@ -145,71 +145,19 @@ static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
struct in6_aliasreq *, int flags);
static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
struct in6_ifaddr *, int, int);
static int in6_setup_ifa(struct ifnet *, struct in6_aliasreq *,
static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
struct in6_ifaddr *, int);
#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
#define ia62ifa(ia6) (&((ia6)->ia_ifa))
void
in6_ifaddloop(struct ifaddr *ifa)
in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
{
struct sockaddr_dl gateway;
struct sockaddr_in6 mask, addr;
struct rtentry rt;
struct in6_ifaddr *ia;
struct ifnet *ifp;
struct llentry *ln;
ia = ifa2ia6(ifa);
ifp = ifa->ifa_ifp;
IF_AFDATA_LOCK(ifp);
ifa->ifa_rtrequest = nd6_rtrequest;
ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
IF_AFDATA_UNLOCK(ifp);
if (ln != NULL) {
ln->la_expire = 0; /* for IPv6 this means permanent */
ln->ln_state = ND6_LLINFO_REACHABLE;
/*
* initialize for rtmsg generation
*/
bzero(&gateway, sizeof(gateway));
gateway.sdl_len = sizeof(gateway);
gateway.sdl_family = AF_LINK;
gateway.sdl_nlen = 0;
gateway.sdl_alen = 6;
memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
sizeof(ln->ll_addr));
LLE_WUNLOCK(ln);
}
bzero(&rt, sizeof(rt));
rt.rt_gateway = (struct sockaddr *)&gateway;
memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
rt_mask(&rt) = (struct sockaddr *)&mask;
rt_key(&rt) = (struct sockaddr *)&addr;
rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
/* Announce arrival of local address to all FIBs. */
rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
}
void
in6_ifremloop(struct ifaddr *ifa)
{
struct sockaddr_dl gateway;
struct sockaddr_in6 mask, addr;
struct rtentry rt0;
struct in6_ifaddr *ia;
struct ifnet *ifp;
ia = ifa2ia6(ifa);
ifp = ifa->ifa_ifp;
memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
(struct sockaddr *)&mask, LLE_STATIC);
/*
* initialize for rtmsg generation
@ -217,15 +165,18 @@ in6_ifremloop(struct ifaddr *ifa)
bzero(&gateway, sizeof(gateway));
gateway.sdl_len = sizeof(gateway);
gateway.sdl_family = AF_LINK;
gateway.sdl_nlen = 0;
gateway.sdl_alen = ifp->if_addrlen;
bzero(&rt0, sizeof(rt0));
rt0.rt_gateway = (struct sockaddr *)&gateway;
rt_mask(&rt0) = (struct sockaddr *)&mask;
rt_key(&rt0) = (struct sockaddr *)&addr;
rt0.rt_flags = RTF_HOST | RTF_STATIC;
/* Announce removal of local address to all FIBs. */
rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
bzero(&rt, sizeof(rt));
rt.rt_gateway = (struct sockaddr *)&gateway;
memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
rt_mask(&rt) = (struct sockaddr *)&mask;
rt_key(&rt) = (struct sockaddr *)&addr;
rt.rt_flags = RTF_HOST | RTF_STATIC;
if (cmd == RTM_ADD)
rt.rt_flags |= RTF_UP;
/* Announce arrival of local address to all FIBs. */
rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
}
int
@ -1031,13 +982,13 @@ in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
}
if (hostIsNew)
error = in6_setup_ifa(ifp, ifra, ia, flags);
error = in6_broadcast_ifa(ifp, ifra, ia, flags);
return (error);
}
/*
* Fill in basic IPv6 address request info
* Fill in basic IPv6 address request info.
*/
void
in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
@ -1078,6 +1029,14 @@ in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
return (EAFNOSUPPORT);
/*
* Validate address
*/
if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
ifra->ifra_addr.sin6_family != AF_INET6)
return (EINVAL);
/*
* validate ifra_prefixmask. don't check sin6_family, netmask
* does not carry fields other than sin6_len.
@ -1211,10 +1170,12 @@ in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
ia->ia_addr.sin6_family = AF_INET6;
ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
/* XXX: Can we assign ,sin6_addr and skip the rest? */
ia->ia_addr = ifra->ifra_addr;
ia->ia6_createtime = time_uptime;
if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
/*
* XXX: some functions expect that ifa_dstaddr is not
* Some functions expect that ifa_dstaddr is not
* NULL for p2p interfaces.
*/
ia->ia_ifa.ifa_dstaddr =
@ -1222,7 +1183,15 @@ in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
} else {
ia->ia_ifa.ifa_dstaddr = NULL;
}
/* set prefix mask if any */
ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
if (ifra->ifra_prefixmask.sin6_len != 0) {
ia->ia_prefixmask.sin6_family = AF_INET6;
ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
}
ia->ia_ifp = ifp;
ifa_ref(&ia->ia_ifa); /* if_addrhead */
IF_ADDR_WLOCK(ifp);
@ -1232,30 +1201,28 @@ in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
IN6_IFADDR_WLOCK();
TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr),
ia, ia6_hash);
LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
IN6_IFADDR_WUNLOCK();
return (ia);
}
/*
* Update/configure interface address parameters:
*
* 1) Update lifetime
* 2) Update interface metric ad flags
* 3) Notify other subsystems
*/
static int
in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int hostIsNew, int flags)
{
struct sockaddr_in6 *pdst;
int error;
char ip6buf[INET6_ADDRSTRLEN];
/* update timestamp */
ia->ia6_updatetime = time_uptime;
/* set prefix mask */
if (ifra->ifra_prefixmask.sin6_len != 0) {
ia->ia_prefixmask = ifra->ifra_prefixmask;
ia->ia_prefixmask.sin6_family = AF_INET6;
}
/*
* Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
* to see if the address is deprecated or invalidated, but initialize
@ -1282,6 +1249,9 @@ in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
ia->ia6_lifetime.ia6t_preferred = time_uptime;
}
/* Update metric */
ia->ia_ifa.ifa_metric = ifp->if_metric;
/*
* configure address flags.
*/
@ -1300,53 +1270,40 @@ in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
ia->ia6_flags |= IN6_IFF_TENTATIVE;
/*
* If a new destination address is specified, scrub the old one and
* install the new destination. Note that the interface must be
* p2p or loopback (see the check above.)
*/
pdst = &ifra->ifra_dstaddr;
if (pdst->sin6_family == AF_INET6 &&
!IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
if ((ia->ia_flags & IFA_ROUTE) != 0 &&
(rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
"remove a route to the old destination: %s\n",
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
/* proceed anyway... */
} else
ia->ia_flags &= ~IFA_ROUTE;
ia->ia_dstaddr = *pdst;
}
/* reset the interface and routing table appropriately. */
if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) {
/*
* XXX: if a change of an existing address failed, keep the entry
* anyway.
*/
}
/* notify other subsystems */
error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
return (error);
}
/*
* Do link-level ifa job:
* 1) Add lle entry for added address
* 2) Notifies routing socket users about new address
* 3) join appropriate multicast group
* 4) start DAD if enabled
*/
static int
in6_setup_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
struct in6_ifaddr *ia, int flags)
{
struct in6_multi *in6m_sol;
int error = 0;
/* Add local address to lltable, if necessary (ex. on p2p link). */
in6_ifaddloop(&(ia->ia_ifa));
if ((error = nd6_add_ifa_lle(ia)) != 0) {
in6_purgeaddr(&ia->ia_ifa);
ifa_free(&ia->ia_ifa);
return (error);
}
/* Join necessary multicast groups. */
in6m_sol = NULL;
if ((ifp->if_flags & IFF_MULTICAST) != 0) {
error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
if (error != 0) {
ifa_free(&ia->ia_ifa);
in6_purgeaddr(&ia->ia_ifa);
ifa_free(&ia->ia_ifa);
return (error);
}
}
@ -1571,7 +1528,7 @@ in6_purgeaddr(struct ifaddr *ifa)
nd6_dad_stop(ifa);
/* Remove local address entry from lltable. */
in6_ifremloop(ifa);
nd6_rem_ifa_lle(ia);
/* Leave multicast groups. */
error = in6_purgeaddr_mc(ifp, ia, ifa0);
@ -1650,29 +1607,33 @@ in6_purgeif(struct ifnet *ifp)
}
/*
* Initialize an interface's IPv6 address and routing table entry.
* Notifies other other subsystems about address change/arrival:
* 1) Notifies device handler on first IPv6 address assignment
* 2) Handle routing table changes for P2P links and route
* 3) Handle routing table changes for address host route
*/
static int
in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
struct sockaddr_in6 *sin6, int newhost)
in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
struct in6_aliasreq *ifra, int hostIsNew)
{
int error = 0, plen, ifacount = 0;
struct ifaddr *ifa;
struct sockaddr_in6 *pdst;
char ip6buf[INET6_ADDRSTRLEN];
/*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifacount++;
if (hostIsNew != 0) {
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifacount++;
}
IF_ADDR_RUNLOCK(ifp);
}
IF_ADDR_RUNLOCK(ifp);
ia->ia_addr = *sin6;
if (ifacount <= 1 && ifp->if_ioctl) {
error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
@ -1680,12 +1641,26 @@ in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
return (error);
}
ia->ia_ifa.ifa_metric = ifp->if_metric;
/* we could do in(6)_socktrim here, but just omit it at this moment. */
/*
* If a new destination address is specified, scrub the old one and
* install the new destination. Note that the interface must be
* p2p or loopback.
*/
pdst = &ifra->ifra_dstaddr;
if (pdst->sin6_family == AF_INET6 &&
!IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
if ((ia->ia_flags & IFA_ROUTE) != 0 &&
(rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
"remove a route to the old destination: %s\n",
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
/* proceed anyway... */
} else
ia->ia_flags &= ~IFA_ROUTE;
ia->ia_dstaddr = *pdst;
}
/*
* Special case:
* If a new destination address is specified for a point-to-point
* interface, install a route to the destination as an interface
* direct route.
@ -1696,19 +1671,19 @@ in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
ia->ia_dstaddr.sin6_family == AF_INET6) {
int rtflags = RTF_UP | RTF_HOST;
error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
if (error)
return (error);
ia->ia_flags |= IFA_ROUTE;
/*
* Handle the case for ::1 .
*/
if (ifp->if_flags & IFF_LOOPBACK)
ia->ia_flags |= IFA_RTSELF;
error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
if (error)
return (error);
ia->ia_flags |= IFA_ROUTE;
}
/*
* add a loopback route to self
* add a loopback route to self if not exists
*/
if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
error = ifa_add_loopback_route((struct ifaddr *)ia,

3
sys/netinet6/in6_var.h
View File

@ -822,12 +822,11 @@ int in6_prefix_ioctl(struct socket *, u_long, caddr_t,
int in6_prefix_add_ifid(int, struct in6_ifaddr *);
void in6_prefix_remove_ifid(int, struct in6_ifaddr *);
void in6_purgeprefix(struct ifnet *);
void in6_ifremloop(struct ifaddr *);
void in6_ifaddloop(struct ifaddr *);
int in6_is_addr_deprecated(struct sockaddr_in6 *);
int in6_src_ioctl(u_long, caddr_t);
void in6_newaddrmsg(struct in6_ifaddr *, int);
/*
* Extended API for IPv6 FIB support.
*/

57
sys/netinet6/nd6.c
View File

@ -133,6 +133,7 @@ static int regen_tmpaddr(struct in6_ifaddr *);
static struct llentry *nd6_free(struct llentry *, int);
static void nd6_llinfo_timer(void *);
static void clear_llinfo_pqueue(struct llentry *);
static void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
#define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
@ -2176,6 +2177,62 @@ nd6_need_cache(struct ifnet *ifp)
}
}
/*
* Add pernament ND6 link-layer record for given
* interface address.
*
* Very similar to IPv4 arp_ifinit(), but:
* 1) IPv6 DAD is performed in different place
* 2) It is called by IPv6 protocol stack in contrast to
* arp_ifinit() which is typically called in SIOCSIFADDR
* driver ioctl handler.
*
*/
int
nd6_add_ifa_lle(struct in6_ifaddr *ia)
{
struct ifnet *ifp;
struct llentry *ln;
ifp = ia->ia_ifa.ifa_ifp;
IF_AFDATA_LOCK(ifp);
ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
IF_AFDATA_UNLOCK(ifp);
if (ln != NULL) {
ln->la_expire = 0; /* for IPv6 this means permanent */
ln->ln_state = ND6_LLINFO_REACHABLE;
LLE_WUNLOCK(ln);
in6_newaddrmsg(ia, RTM_ADD);
return (0);
}
return (ENOBUFS);
}
/*
* Removes ALL lle records for interface address prefix.
* XXXME: That's probably not we really want to do, we need
* to remove address record only and keep other records
* until we determine if given prefix is really going
* to be removed.
*/
void
nd6_rem_ifa_lle(struct in6_ifaddr *ia)
{
struct sockaddr_in6 mask, addr;
struct ifnet *ifp;
in6_newaddrmsg(ia, RTM_DELETE);
ifp = ia->ia_ifa.ifa_ifp;
memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
(struct sockaddr *)&mask, LLE_STATIC);
}
/*
* the callers of this function need to be re-worked to drop
* the lle lock, drop here for now

3
sys/netinet6/nd6.h
View File

@ -404,7 +404,6 @@ void nd6_purge(struct ifnet *);
void nd6_nud_hint(struct rtentry *, struct in6_addr *, int);
int nd6_resolve(struct ifnet *, struct rtentry *, struct mbuf *,
struct sockaddr *, u_char *);
void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
int nd6_ioctl(u_long, caddr_t, struct ifnet *);
struct llentry *nd6_cache_lladdr(struct ifnet *, struct in6_addr *,
char *, int, int, int);
@ -416,6 +415,8 @@ int nd6_output_lle(struct ifnet *, struct ifnet *, struct mbuf *,
int nd6_output_flush(struct ifnet *, struct ifnet *, struct mbuf *,
struct sockaddr_in6 *, struct route *);
int nd6_need_cache(struct ifnet *);
int nd6_add_ifa_lle(struct in6_ifaddr *);
void nd6_rem_ifa_lle(struct in6_ifaddr *);
int nd6_storelladdr(struct ifnet *, struct mbuf *,
const struct sockaddr *, u_char *, struct llentry **);