Differential D25067 Diff 72444 sys/net/route/route_ctl.c

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sys/net/route/route_ctl.c

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#include <sys/lock.h>		#include <sys/lock.h>
#include <sys/rmlock.h>		#include <sys/rmlock.h>

#include <net/if.h>		#include <net/if.h>
#include <net/if_var.h>		#include <net/if_var.h>
#include <net/if_dl.h>		#include <net/if_dl.h>
#include <net/vnet.h>		#include <net/vnet.h>
#include <net/route.h>		#include <net/route.h>
		#include <net/route/route_ctl.h>
#include <net/route/route_var.h>		#include <net/route/route_var.h>
#include <net/route/nhop_utils.h>		#include <net/route/nhop_utils.h>
#include <net/route/nhop.h>		#include <net/route/nhop.h>
#include <net/route/nhop_var.h>		#include <net/route/nhop_var.h>
#include <net/route/shared.h>		#include <net/route/shared.h>
#include <netinet/in.h>		#include <netinet/in.h>

#ifdef RADIX_MPATH		#ifdef RADIX_MPATH
#include <net/radix_mpath.h>		#include <net/radix_mpath.h>
#endif		#endif

#include <vm/uma.h>		#include <vm/uma.h>


/*		/*
* This file contains control plane routing tables functions.		* This file contains control plane routing tables functions.
*		*
* All functions assumes they are called in net epoch.		* All functions assumes they are called in net epoch.
*/		*/

static void rt_notifydelete(struct rtentry rt, struct rt_addrinfo info);		static void rt_notifydelete(struct rtentry rt, struct rt_addrinfo info);

		/*
		* Returns rib_head poiner based on @fibnum and RTAX_DST family
		* from @info.
		*/
		static struct rib_head *
		get_rnh(uint32_t fibnum, const struct rt_addrinfo *info)
		{
		struct rib_head *rnh;
		struct sockaddr *dst;

		KASSERT((fibnum < rt_numfibs), ("%s: bad fibnum", __func__));

		dst = info->rti_info[RTAX_DST];
		rnh = rt_tables_get_rnh(fibnum, dst->sa_family);

		return (rnh);
		}

		/*
		* Adds route defined by @info into the kernel table specified by @fibnum and
		* sa_family in @info->rti_info[RTAX_DST].
		* @rc cannot be NULL.
		*
		* Returns 0 on success and fills in @rc with operation metadata.
		*/
int		int
		rib_add_route(uint32_t fibnum, struct rt_addrinfo *info,
		struct rib_cmd_info *rc)
		{
		struct rib_head *rnh;

		NET_EPOCH_ASSERT();

		rnh = get_rnh(fibnum, info);
		if (rnh == NULL)
		return (EAFNOSUPPORT);

		/*
		* Check consistency between RTF_HOST flag and netmask
		* existence.
		*/
		if (info->rti_flags & RTF_HOST)
		info->rti_info[RTAX_NETMASK] = NULL;
		else if (info->rti_info[RTAX_NETMASK] == NULL)
		return (EINVAL);

		bzero(rc, sizeof(struct rib_cmd_info));
		rc->rc_cmd = RTM_ADD;

		return (add_route(rnh, info, rc));
		}

		int
add_route(struct rib_head rnh, struct rt_addrinfo info,		add_route(struct rib_head rnh, struct rt_addrinfo info,
struct rtentry **ret_nrt)		struct rib_cmd_info *rc)
{		{
struct sockaddr dst, ndst, gateway, netmask;		struct sockaddr dst, ndst, gateway, netmask;
struct rtentry rt, rt_old;		struct rtentry rt, rt_old;
struct nhop_object *nh;		struct nhop_object *nh;
struct radix_node *rn;		struct radix_node *rn;
struct ifaddr *ifa;		struct ifaddr *ifa;
int error, flags;		int error, flags;
struct epoch_tracker et;		struct epoch_tracker et;
▲ Show 20 Lines • Show All 58 Lines • ▼ Show 20 Lines	add_route(struct rib_head rnh, struct rt_addrinfo info,
* We use the ifa reference returned by rt_getifa_fib().		* We use the ifa reference returned by rt_getifa_fib().
* This moved from below so that rnh->rnh_addaddr() can		* This moved from below so that rnh->rnh_addaddr() can
* examine the ifa and ifa->ifa_ifp if it so desires.		* examine the ifa and ifa->ifa_ifp if it so desires.
*/		*/
ifa = info->rti_ifa;		ifa = info->rti_ifa;
rt->rt_weight = 1;		rt->rt_weight = 1;

rt_setmetrics(info, rt);		rt_setmetrics(info, rt);
		rt_old = NULL;

RIB_WLOCK(rnh);		RIB_WLOCK(rnh);
RT_LOCK(rt);		RT_LOCK(rt);
#ifdef RADIX_MPATH		#ifdef RADIX_MPATH
/* do not permit exactly the same dst/mask/gw pair */		/* do not permit exactly the same dst/mask/gw pair */
if (rt_mpath_capable(rnh) &&		if (rt_mpath_capable(rnh) &&
rt_mpath_conflict(rnh, rt, netmask)) {		rt_mpath_conflict(rnh, rt, netmask)) {
RIB_WUNLOCK(rnh);		RIB_WUNLOCK(rnh);

nhop_free(nh);		nhop_free(nh);
uma_zfree(V_rtzone, rt);		uma_zfree(V_rtzone, rt);
return (EEXIST);		return (EEXIST);
}		}
#endif		#endif

rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes);		rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes);

if (rn != NULL && rt->rt_expire > 0)		if (rn != NULL) {
		/* Most common usecase */
		if (rt->rt_expire > 0)
tmproutes_update(rnh, rt);		tmproutes_update(rnh, rt);

rt_old = NULL;		/* Finalize notification */
if (rn == NULL && (info->rti_flags & RTF_PINNED) != 0) {		rnh->rnh_gen++;

		rc->rc_rt = RNTORT(rn);
		rc->rc_nh_new = nh;
		} else if ((info->rti_flags & RTF_PINNED) != 0) {

/*		/*
* Force removal and re-try addition		* Force removal and re-try addition
* TODO: better multipath&pinned support		* TODO: better multipath&pinned support
*/		*/
struct sockaddr *info_dst = info->rti_info[RTAX_DST];		struct sockaddr *info_dst = info->rti_info[RTAX_DST];
info->rti_info[RTAX_DST] = ndst;		info->rti_info[RTAX_DST] = ndst;
/* Do not delete existing PINNED(interface) routes */		/* Do not delete existing PINNED(interface) routes */
info->rti_flags &= ~RTF_PINNED;		info->rti_flags &= ~RTF_PINNED;
rt_old = rt_unlinkrte(rnh, info, &error);		rt_old = rt_unlinkrte(rnh, info, &error);
info->rti_flags \|= RTF_PINNED;		info->rti_flags \|= RTF_PINNED;
info->rti_info[RTAX_DST] = info_dst;		info->rti_info[RTAX_DST] = info_dst;
if (rt_old != NULL)		if (rt_old != NULL) {
rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head,		rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head,
rt->rt_nodes);		rt->rt_nodes);

		/* Finalize notification */
		rnh->rnh_gen++;

		if (rn != NULL) {
		rc->rc_cmd = RTM_CHANGE;
		rc->rc_rt = RNTORT(rn);
		} else {
		rc->rc_cmd = RTM_DELETE;
		rc->rc_rt = rt_old;
}		}
		rc->rc_nh_old = rt_old->rt_nhop;
		rc->rc_nh_new = nh;
		}
		}
RIB_WUNLOCK(rnh);		RIB_WUNLOCK(rnh);

if (rt_old != NULL) {		if (rt_old != NULL) {
rt_notifydelete(rt_old, info);		rt_notifydelete(rt_old, info);
rtfree(rt_old);		rtfree(rt_old);
}		}

/*		/*
* If it still failed to go into the tree,		* If it still failed to go into the tree,
* then un-make it (this should be a function)		* then un-make it (this should be a function)
*/		*/
if (rn == NULL) {		if (rn == NULL) {
nhop_free(nh);		nhop_free(nh);
uma_zfree(V_rtzone, rt);		uma_zfree(V_rtzone, rt);
return (EEXIST);		return (EEXIST);
}		}

/*		/*
* If this protocol has something to add to this then		* If this protocol has something to add to this then
* allow it to do that as well.		* allow it to do that as well.
*/		*/
if (ifa->ifa_rtrequest)		if (ifa->ifa_rtrequest)
ifa->ifa_rtrequest(RTM_ADD, rt, rt->rt_nhop, info);		ifa->ifa_rtrequest(RTM_ADD, rt, rt->rt_nhop, info);

/*
* actually return a resultant rtentry
*/
if (ret_nrt)
*ret_nrt = rt;
rnh->rnh_gen++; /* Routing table updated */
RT_UNLOCK(rt);		RT_UNLOCK(rt);

return (0);		return (0);
}		}


/*		/*
		* Removes route defined by @info from the kernel table specified by @fibnum and
		* sa_family in @info->rti_info[RTAX_DST].
		*
		* Returns 0 on success and fills @rc with operation metadata.
		*/
		int
		rib_del_route(uint32_t fibnum, struct rt_addrinfo info, struct rib_cmd_info rc)
		{
		struct rib_head *rnh;

		NET_EPOCH_ASSERT();

		rnh = get_rnh(fibnum, info);
		if (rnh == NULL)
		return (EAFNOSUPPORT);

		bzero(rc, sizeof(struct rib_cmd_info));
		rc->rc_cmd = RTM_DELETE;

		return (del_route(rnh, info, rc));
		}

		/*
* Conditionally unlinks rtentry matching data inside @info from @rnh.		* Conditionally unlinks rtentry matching data inside @info from @rnh.
* Returns unlinked, locked and referenced @rtentry on success,		* Returns unlinked, locked and referenced @rtentry on success,
* Returns NULL and sets @perror to:		* Returns NULL and sets @perror to:
* ESRCH - if prefix was not found,		* ESRCH - if prefix was not found,
* EADDRINUSE - if trying to delete PINNED route without appropriate flag.		* EADDRINUSE - if trying to delete PINNED route without appropriate flag.
* ENOENT - if supplied filter function returned 0 (not matched).		* ENOENT - if supplied filter function returned 0 (not matched).
*/		*/
struct rtentry *		struct rtentry *
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*perror = 0;		*perror = 0;

return (rt);		return (rt);
}		}

int		int
del_route(struct rib_head rnh, struct rt_addrinfo info,		del_route(struct rib_head rnh, struct rt_addrinfo info,
struct rtentry **ret_nrt)		struct rib_cmd_info *rc)
{		{
struct sockaddr dst, netmask;		struct sockaddr dst, netmask;
struct sockaddr_storage mdst;		struct sockaddr_storage mdst;
struct rtentry *rt;		struct rtentry *rt;
int error;		int error;

dst = info->rti_info[RTAX_DST];		dst = info->rti_info[RTAX_DST];
netmask = info->rti_info[RTAX_NETMASK];		netmask = info->rti_info[RTAX_NETMASK];

if (netmask) {		if (netmask) {
if (dst->sa_len > sizeof(mdst))		if (dst->sa_len > sizeof(mdst))
return (EINVAL);		return (EINVAL);
rt_maskedcopy(dst, (struct sockaddr *)&mdst, netmask);		rt_maskedcopy(dst, (struct sockaddr *)&mdst, netmask);
dst = (struct sockaddr *)&mdst;		dst = (struct sockaddr *)&mdst;
}		}

RIB_WLOCK(rnh);		RIB_WLOCK(rnh);
rt = rt_unlinkrte(rnh, info, &error);		rt = rt_unlinkrte(rnh, info, &error);
		if (rt != NULL) {
		/* Finalize notification */
		rnh->rnh_gen++;
		rc->rc_rt = rt;
		rc->rc_nh_old = rt->rt_nhop;
		}
RIB_WUNLOCK(rnh);		RIB_WUNLOCK(rnh);
if (error != 0)		if (error != 0)
return (error);		return (error);

rt_notifydelete(rt, info);		rt_notifydelete(rt, info);

/*		/*
* If the caller wants it, then it can have it,		* If the caller wants it, then it can have it,
* the entry will be deleted after the end of the current epoch.		* the entry will be deleted after the end of the current epoch.
*/		*/
if (ret_nrt)
*ret_nrt = rt;

rtfree(rt);		rtfree(rt);

return (0);		return (0);
}		}

		int
		rib_change_route(uint32_t fibnum, struct rt_addrinfo *info,
		struct rib_cmd_info *rc)
		{
		struct rib_head *rnh;

		NET_EPOCH_ASSERT();

		rnh = get_rnh(fibnum, info);
		if (rnh == NULL)
		return (EAFNOSUPPORT);

		bzero(rc, sizeof(struct rib_cmd_info));
		rc->rc_cmd = RTM_CHANGE;

		return (change_route(rnh, info, rc));
		}

static int		static int
change_route_one(struct rib_head rnh, struct rt_addrinfo info,		change_route_one(struct rib_head rnh, struct rt_addrinfo info,
struct rtentry **ret_nrt)		struct rib_cmd_info *rc)
{		{
RIB_RLOCK_TRACKER;		RIB_RLOCK_TRACKER;
struct rtentry *rt = NULL;		struct rtentry *rt = NULL;
int error = 0;		int error = 0;
int free_ifa = 0;		int free_ifa = 0;
struct nhop_object nh, nh_orig;		struct nhop_object nh, nh_orig;

RIB_RLOCK(rnh);		RIB_RLOCK(rnh);
▲ Show 20 Lines • Show All 83 Lines • ▼ Show 20 Lines	if ((nh_orig->nh_ifa != nh->nh_ifa) && nh_orig->nh_ifa->ifa_rtrequest)
nh_orig->nh_ifa->ifa_rtrequest(RTM_DELETE, rt, nh_orig, info);		nh_orig->nh_ifa->ifa_rtrequest(RTM_DELETE, rt, nh_orig, info);

rt->rt_nhop = nh;		rt->rt_nhop = nh;
rt_setmetrics(info, rt);		rt_setmetrics(info, rt);

if ((nh_orig->nh_ifa != nh->nh_ifa) && nh_orig->nh_ifa->ifa_rtrequest)		if ((nh_orig->nh_ifa != nh->nh_ifa) && nh_orig->nh_ifa->ifa_rtrequest)
nh_orig->nh_ifa->ifa_rtrequest(RTM_DELETE, rt, nh_orig, info);		nh_orig->nh_ifa->ifa_rtrequest(RTM_DELETE, rt, nh_orig, info);

if (ret_nrt != NULL)		/* Finalize notification */
*ret_nrt = rt;		rc->rc_rt = rt;
		rc->rc_nh_old = nh_orig;
		rc->rc_nh_new = rt->rt_nhop;

RT_UNLOCK(rt);		RT_UNLOCK(rt);

/* Update generation id to reflect rtable change */		/* Update generation id to reflect rtable change */
rnh->rnh_gen++;		rnh->rnh_gen++;

RIB_WUNLOCK(rnh);		RIB_WUNLOCK(rnh);

nhop_free(nh_orig);		nhop_free(nh_orig);

return (0);		return (0);
}		}

int		int
change_route(struct rib_head rnh, struct rt_addrinfo info,		change_route(struct rib_head rnh, struct rt_addrinfo info,
struct rtentry **ret_nrt)		struct rib_cmd_info *rc)
{		{
int error;		int error;

/* Check if updated gateway exists */		/* Check if updated gateway exists */
if ((info->rti_flags & RTF_GATEWAY) &&		if ((info->rti_flags & RTF_GATEWAY) &&
(info->rti_info[RTAX_GATEWAY] == NULL))		(info->rti_info[RTAX_GATEWAY] == NULL))
return (EINVAL);		return (EINVAL);

/*		/*
* route change is done in multiple steps, with dropping and		* route change is done in multiple steps, with dropping and
* reacquiring lock. In the situations with multiple processes		* reacquiring lock. In the situations with multiple processes
* changes the same route in can lead to the case when route		* changes the same route in can lead to the case when route
* is changed between the steps. Address it by retrying the operation		* is changed between the steps. Address it by retrying the operation
* multiple times before failing.		* multiple times before failing.
*/		*/
for (int i = 0; i < RIB_MAX_RETRIES; i++) {		for (int i = 0; i < RIB_MAX_RETRIES; i++) {
error = change_route_one(rnh, info, ret_nrt);		error = change_route_one(rnh, info, rc);
if (error != EAGAIN)		if (error != EAGAIN)
break;		break;
}		}

return (error);		return (error);
}		}

static void		static void
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