/*
|
/*
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
* operating system. INET is implemented using the BSD Socket
|
* operating system. INET is implemented using the BSD Socket
|
* interface as the means of communication with the user level.
|
* interface as the means of communication with the user level.
|
*
|
*
|
* IPv4 Forwarding Information Base: semantics.
|
* IPv4 Forwarding Information Base: semantics.
|
*
|
*
|
* Version: $Id: fib_semantics.c,v 1.1.1.1 2004-04-15 01:13:45 phoenix Exp $
|
* Version: $Id: fib_semantics.c,v 1.1.1.1 2004-04-15 01:13:45 phoenix Exp $
|
*
|
*
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
*
|
*
|
* This program is free software; you can redistribute it and/or
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License
|
* modify it under the terms of the GNU General Public License
|
* as published by the Free Software Foundation; either version
|
* as published by the Free Software Foundation; either version
|
* 2 of the License, or (at your option) any later version.
|
* 2 of the License, or (at your option) any later version.
|
*/
|
*/
|
|
|
#include <linux/config.h>
|
#include <linux/config.h>
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
#include <asm/system.h>
|
#include <asm/system.h>
|
#include <asm/bitops.h>
|
#include <asm/bitops.h>
|
#include <linux/types.h>
|
#include <linux/types.h>
|
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/mm.h>
|
#include <linux/mm.h>
|
#include <linux/string.h>
|
#include <linux/string.h>
|
#include <linux/socket.h>
|
#include <linux/socket.h>
|
#include <linux/sockios.h>
|
#include <linux/sockios.h>
|
#include <linux/errno.h>
|
#include <linux/errno.h>
|
#include <linux/in.h>
|
#include <linux/in.h>
|
#include <linux/inet.h>
|
#include <linux/inet.h>
|
#include <linux/netdevice.h>
|
#include <linux/netdevice.h>
|
#include <linux/if_arp.h>
|
#include <linux/if_arp.h>
|
#include <linux/proc_fs.h>
|
#include <linux/proc_fs.h>
|
#include <linux/skbuff.h>
|
#include <linux/skbuff.h>
|
#include <linux/netlink.h>
|
#include <linux/netlink.h>
|
#include <linux/init.h>
|
#include <linux/init.h>
|
|
|
#include <net/ip.h>
|
#include <net/ip.h>
|
#include <net/protocol.h>
|
#include <net/protocol.h>
|
#include <net/route.h>
|
#include <net/route.h>
|
#include <net/tcp.h>
|
#include <net/tcp.h>
|
#include <net/sock.h>
|
#include <net/sock.h>
|
#include <net/ip_fib.h>
|
#include <net/ip_fib.h>
|
|
|
#define FSprintk(a...)
|
#define FSprintk(a...)
|
|
|
static struct fib_info *fib_info_list;
|
static struct fib_info *fib_info_list;
|
static rwlock_t fib_info_lock = RW_LOCK_UNLOCKED;
|
static rwlock_t fib_info_lock = RW_LOCK_UNLOCKED;
|
int fib_info_cnt;
|
int fib_info_cnt;
|
|
|
#define for_fib_info() { struct fib_info *fi; \
|
#define for_fib_info() { struct fib_info *fi; \
|
for (fi = fib_info_list; fi; fi = fi->fib_next)
|
for (fi = fib_info_list; fi; fi = fi->fib_next)
|
|
|
#define endfor_fib_info() }
|
#define endfor_fib_info() }
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
|
static spinlock_t fib_multipath_lock = SPIN_LOCK_UNLOCKED;
|
static spinlock_t fib_multipath_lock = SPIN_LOCK_UNLOCKED;
|
|
|
#define for_nexthops(fi) { int nhsel; const struct fib_nh * nh; \
|
#define for_nexthops(fi) { int nhsel; const struct fib_nh * nh; \
|
for (nhsel=0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
|
for (nhsel=0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
|
|
|
#define change_nexthops(fi) { int nhsel; struct fib_nh * nh; \
|
#define change_nexthops(fi) { int nhsel; struct fib_nh * nh; \
|
for (nhsel=0, nh = (struct fib_nh*)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
|
for (nhsel=0, nh = (struct fib_nh*)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
|
|
|
#else /* CONFIG_IP_ROUTE_MULTIPATH */
|
#else /* CONFIG_IP_ROUTE_MULTIPATH */
|
|
|
/* Hope, that gcc will optimize it to get rid of dummy loop */
|
/* Hope, that gcc will optimize it to get rid of dummy loop */
|
|
|
#define for_nexthops(fi) { int nhsel=0; const struct fib_nh * nh = (fi)->fib_nh; \
|
#define for_nexthops(fi) { int nhsel=0; const struct fib_nh * nh = (fi)->fib_nh; \
|
for (nhsel=0; nhsel < 1; nhsel++)
|
for (nhsel=0; nhsel < 1; nhsel++)
|
|
|
#define change_nexthops(fi) { int nhsel=0; struct fib_nh * nh = (struct fib_nh*)((fi)->fib_nh); \
|
#define change_nexthops(fi) { int nhsel=0; struct fib_nh * nh = (struct fib_nh*)((fi)->fib_nh); \
|
for (nhsel=0; nhsel < 1; nhsel++)
|
for (nhsel=0; nhsel < 1; nhsel++)
|
|
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH */
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH */
|
|
|
#define endfor_nexthops(fi) }
|
#define endfor_nexthops(fi) }
|
|
|
|
|
static struct
|
static struct
|
{
|
{
|
int error;
|
int error;
|
u8 scope;
|
u8 scope;
|
} fib_props[RTA_MAX+1] = {
|
} fib_props[RTA_MAX+1] = {
|
{ 0, RT_SCOPE_NOWHERE}, /* RTN_UNSPEC */
|
{ 0, RT_SCOPE_NOWHERE}, /* RTN_UNSPEC */
|
{ 0, RT_SCOPE_UNIVERSE}, /* RTN_UNICAST */
|
{ 0, RT_SCOPE_UNIVERSE}, /* RTN_UNICAST */
|
{ 0, RT_SCOPE_HOST}, /* RTN_LOCAL */
|
{ 0, RT_SCOPE_HOST}, /* RTN_LOCAL */
|
{ 0, RT_SCOPE_LINK}, /* RTN_BROADCAST */
|
{ 0, RT_SCOPE_LINK}, /* RTN_BROADCAST */
|
{ 0, RT_SCOPE_LINK}, /* RTN_ANYCAST */
|
{ 0, RT_SCOPE_LINK}, /* RTN_ANYCAST */
|
{ 0, RT_SCOPE_UNIVERSE}, /* RTN_MULTICAST */
|
{ 0, RT_SCOPE_UNIVERSE}, /* RTN_MULTICAST */
|
{ -EINVAL, RT_SCOPE_UNIVERSE}, /* RTN_BLACKHOLE */
|
{ -EINVAL, RT_SCOPE_UNIVERSE}, /* RTN_BLACKHOLE */
|
{ -EHOSTUNREACH, RT_SCOPE_UNIVERSE},/* RTN_UNREACHABLE */
|
{ -EHOSTUNREACH, RT_SCOPE_UNIVERSE},/* RTN_UNREACHABLE */
|
{ -EACCES, RT_SCOPE_UNIVERSE}, /* RTN_PROHIBIT */
|
{ -EACCES, RT_SCOPE_UNIVERSE}, /* RTN_PROHIBIT */
|
{ -EAGAIN, RT_SCOPE_UNIVERSE}, /* RTN_THROW */
|
{ -EAGAIN, RT_SCOPE_UNIVERSE}, /* RTN_THROW */
|
#ifdef CONFIG_IP_ROUTE_NAT
|
#ifdef CONFIG_IP_ROUTE_NAT
|
{ 0, RT_SCOPE_HOST}, /* RTN_NAT */
|
{ 0, RT_SCOPE_HOST}, /* RTN_NAT */
|
#else
|
#else
|
{ -EINVAL, RT_SCOPE_NOWHERE}, /* RTN_NAT */
|
{ -EINVAL, RT_SCOPE_NOWHERE}, /* RTN_NAT */
|
#endif
|
#endif
|
{ -EINVAL, RT_SCOPE_NOWHERE} /* RTN_XRESOLVE */
|
{ -EINVAL, RT_SCOPE_NOWHERE} /* RTN_XRESOLVE */
|
};
|
};
|
|
|
|
|
/* Release a nexthop info record */
|
/* Release a nexthop info record */
|
|
|
void free_fib_info(struct fib_info *fi)
|
void free_fib_info(struct fib_info *fi)
|
{
|
{
|
if (fi->fib_dead == 0) {
|
if (fi->fib_dead == 0) {
|
printk("Freeing alive fib_info %p\n", fi);
|
printk("Freeing alive fib_info %p\n", fi);
|
return;
|
return;
|
}
|
}
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if (nh->nh_dev)
|
if (nh->nh_dev)
|
dev_put(nh->nh_dev);
|
dev_put(nh->nh_dev);
|
nh->nh_dev = NULL;
|
nh->nh_dev = NULL;
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
fib_info_cnt--;
|
fib_info_cnt--;
|
kfree(fi);
|
kfree(fi);
|
}
|
}
|
|
|
void fib_release_info(struct fib_info *fi)
|
void fib_release_info(struct fib_info *fi)
|
{
|
{
|
write_lock(&fib_info_lock);
|
write_lock(&fib_info_lock);
|
if (fi && --fi->fib_treeref == 0) {
|
if (fi && --fi->fib_treeref == 0) {
|
if (fi->fib_next)
|
if (fi->fib_next)
|
fi->fib_next->fib_prev = fi->fib_prev;
|
fi->fib_next->fib_prev = fi->fib_prev;
|
if (fi->fib_prev)
|
if (fi->fib_prev)
|
fi->fib_prev->fib_next = fi->fib_next;
|
fi->fib_prev->fib_next = fi->fib_next;
|
if (fi == fib_info_list)
|
if (fi == fib_info_list)
|
fib_info_list = fi->fib_next;
|
fib_info_list = fi->fib_next;
|
fi->fib_dead = 1;
|
fi->fib_dead = 1;
|
fib_info_put(fi);
|
fib_info_put(fi);
|
}
|
}
|
write_unlock(&fib_info_lock);
|
write_unlock(&fib_info_lock);
|
}
|
}
|
|
|
static __inline__ int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
|
static __inline__ int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
|
{
|
{
|
const struct fib_nh *onh = ofi->fib_nh;
|
const struct fib_nh *onh = ofi->fib_nh;
|
|
|
for_nexthops(fi) {
|
for_nexthops(fi) {
|
if (nh->nh_oif != onh->nh_oif ||
|
if (nh->nh_oif != onh->nh_oif ||
|
nh->nh_gw != onh->nh_gw ||
|
nh->nh_gw != onh->nh_gw ||
|
nh->nh_scope != onh->nh_scope ||
|
nh->nh_scope != onh->nh_scope ||
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
nh->nh_weight != onh->nh_weight ||
|
nh->nh_weight != onh->nh_weight ||
|
#endif
|
#endif
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
nh->nh_tclassid != onh->nh_tclassid ||
|
nh->nh_tclassid != onh->nh_tclassid ||
|
#endif
|
#endif
|
((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
|
((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
|
return -1;
|
return -1;
|
onh++;
|
onh++;
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static __inline__ struct fib_info * fib_find_info(const struct fib_info *nfi)
|
static __inline__ struct fib_info * fib_find_info(const struct fib_info *nfi)
|
{
|
{
|
for_fib_info() {
|
for_fib_info() {
|
if (fi->fib_nhs != nfi->fib_nhs)
|
if (fi->fib_nhs != nfi->fib_nhs)
|
continue;
|
continue;
|
if (nfi->fib_protocol == fi->fib_protocol &&
|
if (nfi->fib_protocol == fi->fib_protocol &&
|
nfi->fib_prefsrc == fi->fib_prefsrc &&
|
nfi->fib_prefsrc == fi->fib_prefsrc &&
|
nfi->fib_priority == fi->fib_priority &&
|
nfi->fib_priority == fi->fib_priority &&
|
memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
|
memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
|
((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
|
((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
|
(nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
|
(nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
|
return fi;
|
return fi;
|
} endfor_fib_info();
|
} endfor_fib_info();
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Check, that the gateway is already configured.
|
/* Check, that the gateway is already configured.
|
Used only by redirect accept routine.
|
Used only by redirect accept routine.
|
*/
|
*/
|
|
|
int ip_fib_check_default(u32 gw, struct net_device *dev)
|
int ip_fib_check_default(u32 gw, struct net_device *dev)
|
{
|
{
|
read_lock(&fib_info_lock);
|
read_lock(&fib_info_lock);
|
for_fib_info() {
|
for_fib_info() {
|
if (fi->fib_flags & RTNH_F_DEAD)
|
if (fi->fib_flags & RTNH_F_DEAD)
|
continue;
|
continue;
|
for_nexthops(fi) {
|
for_nexthops(fi) {
|
if (nh->nh_dev == dev && nh->nh_gw == gw &&
|
if (nh->nh_dev == dev && nh->nh_gw == gw &&
|
nh->nh_scope == RT_SCOPE_LINK &&
|
nh->nh_scope == RT_SCOPE_LINK &&
|
!(nh->nh_flags&RTNH_F_DEAD)) {
|
!(nh->nh_flags&RTNH_F_DEAD)) {
|
read_unlock(&fib_info_lock);
|
read_unlock(&fib_info_lock);
|
return 0;
|
return 0;
|
}
|
}
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
} endfor_fib_info();
|
} endfor_fib_info();
|
read_unlock(&fib_info_lock);
|
read_unlock(&fib_info_lock);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
|
static u32 fib_get_attr32(struct rtattr *attr, int attrlen, int type)
|
static u32 fib_get_attr32(struct rtattr *attr, int attrlen, int type)
|
{
|
{
|
while (RTA_OK(attr,attrlen)) {
|
while (RTA_OK(attr,attrlen)) {
|
if (attr->rta_type == type)
|
if (attr->rta_type == type)
|
return *(u32*)RTA_DATA(attr);
|
return *(u32*)RTA_DATA(attr);
|
attr = RTA_NEXT(attr, attrlen);
|
attr = RTA_NEXT(attr, attrlen);
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
fib_count_nexthops(struct rtattr *rta)
|
fib_count_nexthops(struct rtattr *rta)
|
{
|
{
|
int nhs = 0;
|
int nhs = 0;
|
struct rtnexthop *nhp = RTA_DATA(rta);
|
struct rtnexthop *nhp = RTA_DATA(rta);
|
int nhlen = RTA_PAYLOAD(rta);
|
int nhlen = RTA_PAYLOAD(rta);
|
|
|
while (nhlen >= (int)sizeof(struct rtnexthop)) {
|
while (nhlen >= (int)sizeof(struct rtnexthop)) {
|
if ((nhlen -= nhp->rtnh_len) < 0)
|
if ((nhlen -= nhp->rtnh_len) < 0)
|
return 0;
|
return 0;
|
nhs++;
|
nhs++;
|
nhp = RTNH_NEXT(nhp);
|
nhp = RTNH_NEXT(nhp);
|
};
|
};
|
return nhs;
|
return nhs;
|
}
|
}
|
|
|
static int
|
static int
|
fib_get_nhs(struct fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
|
fib_get_nhs(struct fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
|
{
|
{
|
struct rtnexthop *nhp = RTA_DATA(rta);
|
struct rtnexthop *nhp = RTA_DATA(rta);
|
int nhlen = RTA_PAYLOAD(rta);
|
int nhlen = RTA_PAYLOAD(rta);
|
|
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
int attrlen = nhlen - sizeof(struct rtnexthop);
|
int attrlen = nhlen - sizeof(struct rtnexthop);
|
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
|
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
|
return -EINVAL;
|
return -EINVAL;
|
nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
|
nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
|
nh->nh_oif = nhp->rtnh_ifindex;
|
nh->nh_oif = nhp->rtnh_ifindex;
|
nh->nh_weight = nhp->rtnh_hops + 1;
|
nh->nh_weight = nhp->rtnh_hops + 1;
|
if (attrlen) {
|
if (attrlen) {
|
nh->nh_gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
|
nh->nh_gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
nh->nh_tclassid = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_FLOW);
|
nh->nh_tclassid = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_FLOW);
|
#endif
|
#endif
|
}
|
}
|
nhp = RTNH_NEXT(nhp);
|
nhp = RTNH_NEXT(nhp);
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
#endif
|
#endif
|
|
|
int fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct kern_rta *rta,
|
int fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct kern_rta *rta,
|
struct fib_info *fi)
|
struct fib_info *fi)
|
{
|
{
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
struct rtnexthop *nhp;
|
struct rtnexthop *nhp;
|
int nhlen;
|
int nhlen;
|
#endif
|
#endif
|
|
|
if (rta->rta_priority &&
|
if (rta->rta_priority &&
|
*rta->rta_priority != fi->fib_priority)
|
*rta->rta_priority != fi->fib_priority)
|
return 1;
|
return 1;
|
|
|
if (rta->rta_oif || rta->rta_gw) {
|
if (rta->rta_oif || rta->rta_gw) {
|
if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
|
if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
|
(!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 4) == 0))
|
(!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 4) == 0))
|
return 0;
|
return 0;
|
return 1;
|
return 1;
|
}
|
}
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if (rta->rta_mp == NULL)
|
if (rta->rta_mp == NULL)
|
return 0;
|
return 0;
|
nhp = RTA_DATA(rta->rta_mp);
|
nhp = RTA_DATA(rta->rta_mp);
|
nhlen = RTA_PAYLOAD(rta->rta_mp);
|
nhlen = RTA_PAYLOAD(rta->rta_mp);
|
|
|
for_nexthops(fi) {
|
for_nexthops(fi) {
|
int attrlen = nhlen - sizeof(struct rtnexthop);
|
int attrlen = nhlen - sizeof(struct rtnexthop);
|
u32 gw;
|
u32 gw;
|
|
|
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
|
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
|
return -EINVAL;
|
return -EINVAL;
|
if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
|
if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
|
return 1;
|
return 1;
|
if (attrlen) {
|
if (attrlen) {
|
gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
|
gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
|
if (gw && gw != nh->nh_gw)
|
if (gw && gw != nh->nh_gw)
|
return 1;
|
return 1;
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_FLOW);
|
gw = fib_get_attr32(RTNH_DATA(nhp), attrlen, RTA_FLOW);
|
if (gw && gw != nh->nh_tclassid)
|
if (gw && gw != nh->nh_tclassid)
|
return 1;
|
return 1;
|
#endif
|
#endif
|
}
|
}
|
nhp = RTNH_NEXT(nhp);
|
nhp = RTNH_NEXT(nhp);
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
#endif
|
#endif
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
Picture
|
Picture
|
-------
|
-------
|
|
|
Semantics of nexthop is very messy by historical reasons.
|
Semantics of nexthop is very messy by historical reasons.
|
We have to take into account, that:
|
We have to take into account, that:
|
a) gateway can be actually local interface address,
|
a) gateway can be actually local interface address,
|
so that gatewayed route is direct.
|
so that gatewayed route is direct.
|
b) gateway must be on-link address, possibly
|
b) gateway must be on-link address, possibly
|
described not by an ifaddr, but also by a direct route.
|
described not by an ifaddr, but also by a direct route.
|
c) If both gateway and interface are specified, they should not
|
c) If both gateway and interface are specified, they should not
|
contradict.
|
contradict.
|
d) If we use tunnel routes, gateway could be not on-link.
|
d) If we use tunnel routes, gateway could be not on-link.
|
|
|
Attempt to reconcile all of these (alas, self-contradictory) conditions
|
Attempt to reconcile all of these (alas, self-contradictory) conditions
|
results in pretty ugly and hairy code with obscure logic.
|
results in pretty ugly and hairy code with obscure logic.
|
|
|
I choosed to generalized it instead, so that the size
|
I choosed to generalized it instead, so that the size
|
of code does not increase practically, but it becomes
|
of code does not increase practically, but it becomes
|
much more general.
|
much more general.
|
Every prefix is assigned a "scope" value: "host" is local address,
|
Every prefix is assigned a "scope" value: "host" is local address,
|
"link" is direct route,
|
"link" is direct route,
|
[ ... "site" ... "interior" ... ]
|
[ ... "site" ... "interior" ... ]
|
and "universe" is true gateway route with global meaning.
|
and "universe" is true gateway route with global meaning.
|
|
|
Every prefix refers to a set of "nexthop"s (gw, oif),
|
Every prefix refers to a set of "nexthop"s (gw, oif),
|
where gw must have narrower scope. This recursion stops
|
where gw must have narrower scope. This recursion stops
|
when gw has LOCAL scope or if "nexthop" is declared ONLINK,
|
when gw has LOCAL scope or if "nexthop" is declared ONLINK,
|
which means that gw is forced to be on link.
|
which means that gw is forced to be on link.
|
|
|
Code is still hairy, but now it is apparently logically
|
Code is still hairy, but now it is apparently logically
|
consistent and very flexible. F.e. as by-product it allows
|
consistent and very flexible. F.e. as by-product it allows
|
to co-exists in peace independent exterior and interior
|
to co-exists in peace independent exterior and interior
|
routing processes.
|
routing processes.
|
|
|
Normally it looks as following.
|
Normally it looks as following.
|
|
|
{universe prefix} -> (gw, oif) [scope link]
|
{universe prefix} -> (gw, oif) [scope link]
|
|
|
|
|
|-> {link prefix} -> (gw, oif) [scope local]
|
|-> {link prefix} -> (gw, oif) [scope local]
|
|
|
|
|
|-> {local prefix} (terminal node)
|
|-> {local prefix} (terminal node)
|
*/
|
*/
|
|
|
static int fib_check_nh(const struct rtmsg *r, struct fib_info *fi, struct fib_nh *nh)
|
static int fib_check_nh(const struct rtmsg *r, struct fib_info *fi, struct fib_nh *nh)
|
{
|
{
|
int err;
|
int err;
|
|
|
if (nh->nh_gw) {
|
if (nh->nh_gw) {
|
struct rt_key key;
|
struct rt_key key;
|
struct fib_result res;
|
struct fib_result res;
|
|
|
#ifdef CONFIG_IP_ROUTE_PERVASIVE
|
#ifdef CONFIG_IP_ROUTE_PERVASIVE
|
if (nh->nh_flags&RTNH_F_PERVASIVE)
|
if (nh->nh_flags&RTNH_F_PERVASIVE)
|
return 0;
|
return 0;
|
#endif
|
#endif
|
if (nh->nh_flags&RTNH_F_ONLINK) {
|
if (nh->nh_flags&RTNH_F_ONLINK) {
|
struct net_device *dev;
|
struct net_device *dev;
|
|
|
if (r->rtm_scope >= RT_SCOPE_LINK)
|
if (r->rtm_scope >= RT_SCOPE_LINK)
|
return -EINVAL;
|
return -EINVAL;
|
if (inet_addr_type(nh->nh_gw) != RTN_UNICAST)
|
if (inet_addr_type(nh->nh_gw) != RTN_UNICAST)
|
return -EINVAL;
|
return -EINVAL;
|
if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
|
if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
|
return -ENODEV;
|
return -ENODEV;
|
if (!(dev->flags&IFF_UP))
|
if (!(dev->flags&IFF_UP))
|
return -ENETDOWN;
|
return -ENETDOWN;
|
nh->nh_dev = dev;
|
nh->nh_dev = dev;
|
dev_hold(dev);
|
dev_hold(dev);
|
nh->nh_scope = RT_SCOPE_LINK;
|
nh->nh_scope = RT_SCOPE_LINK;
|
return 0;
|
return 0;
|
}
|
}
|
memset(&key, 0, sizeof(key));
|
memset(&key, 0, sizeof(key));
|
key.dst = nh->nh_gw;
|
key.dst = nh->nh_gw;
|
key.oif = nh->nh_oif;
|
key.oif = nh->nh_oif;
|
key.scope = r->rtm_scope + 1;
|
key.scope = r->rtm_scope + 1;
|
|
|
/* It is not necessary, but requires a bit of thinking */
|
/* It is not necessary, but requires a bit of thinking */
|
if (key.scope < RT_SCOPE_LINK)
|
if (key.scope < RT_SCOPE_LINK)
|
key.scope = RT_SCOPE_LINK;
|
key.scope = RT_SCOPE_LINK;
|
if ((err = fib_lookup(&key, &res)) != 0)
|
if ((err = fib_lookup(&key, &res)) != 0)
|
return err;
|
return err;
|
err = -EINVAL;
|
err = -EINVAL;
|
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
|
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
|
goto out;
|
goto out;
|
nh->nh_scope = res.scope;
|
nh->nh_scope = res.scope;
|
nh->nh_oif = FIB_RES_OIF(res);
|
nh->nh_oif = FIB_RES_OIF(res);
|
if ((nh->nh_dev = FIB_RES_DEV(res)) == NULL)
|
if ((nh->nh_dev = FIB_RES_DEV(res)) == NULL)
|
goto out;
|
goto out;
|
dev_hold(nh->nh_dev);
|
dev_hold(nh->nh_dev);
|
err = -ENETDOWN;
|
err = -ENETDOWN;
|
if (!(nh->nh_dev->flags & IFF_UP))
|
if (!(nh->nh_dev->flags & IFF_UP))
|
goto out;
|
goto out;
|
err = 0;
|
err = 0;
|
out:
|
out:
|
fib_res_put(&res);
|
fib_res_put(&res);
|
return err;
|
return err;
|
} else {
|
} else {
|
struct in_device *in_dev;
|
struct in_device *in_dev;
|
|
|
if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
|
if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
|
return -EINVAL;
|
return -EINVAL;
|
|
|
in_dev = inetdev_by_index(nh->nh_oif);
|
in_dev = inetdev_by_index(nh->nh_oif);
|
if (in_dev == NULL)
|
if (in_dev == NULL)
|
return -ENODEV;
|
return -ENODEV;
|
if (!(in_dev->dev->flags&IFF_UP)) {
|
if (!(in_dev->dev->flags&IFF_UP)) {
|
in_dev_put(in_dev);
|
in_dev_put(in_dev);
|
return -ENETDOWN;
|
return -ENETDOWN;
|
}
|
}
|
nh->nh_dev = in_dev->dev;
|
nh->nh_dev = in_dev->dev;
|
dev_hold(nh->nh_dev);
|
dev_hold(nh->nh_dev);
|
nh->nh_scope = RT_SCOPE_HOST;
|
nh->nh_scope = RT_SCOPE_HOST;
|
in_dev_put(in_dev);
|
in_dev_put(in_dev);
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct fib_info *
|
struct fib_info *
|
fib_create_info(const struct rtmsg *r, struct kern_rta *rta,
|
fib_create_info(const struct rtmsg *r, struct kern_rta *rta,
|
const struct nlmsghdr *nlh, int *errp)
|
const struct nlmsghdr *nlh, int *errp)
|
{
|
{
|
int err;
|
int err;
|
struct fib_info *fi = NULL;
|
struct fib_info *fi = NULL;
|
struct fib_info *ofi;
|
struct fib_info *ofi;
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
int nhs = 1;
|
int nhs = 1;
|
#else
|
#else
|
const int nhs = 1;
|
const int nhs = 1;
|
#endif
|
#endif
|
|
|
/* Fast check to catch the most weird cases */
|
/* Fast check to catch the most weird cases */
|
if (fib_props[r->rtm_type].scope > r->rtm_scope)
|
if (fib_props[r->rtm_type].scope > r->rtm_scope)
|
goto err_inval;
|
goto err_inval;
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if (rta->rta_mp) {
|
if (rta->rta_mp) {
|
nhs = fib_count_nexthops(rta->rta_mp);
|
nhs = fib_count_nexthops(rta->rta_mp);
|
if (nhs == 0)
|
if (nhs == 0)
|
goto err_inval;
|
goto err_inval;
|
}
|
}
|
#endif
|
#endif
|
|
|
fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL);
|
fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct fib_nh), GFP_KERNEL);
|
err = -ENOBUFS;
|
err = -ENOBUFS;
|
if (fi == NULL)
|
if (fi == NULL)
|
goto failure;
|
goto failure;
|
fib_info_cnt++;
|
fib_info_cnt++;
|
memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct fib_nh));
|
memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct fib_nh));
|
|
|
fi->fib_protocol = r->rtm_protocol;
|
fi->fib_protocol = r->rtm_protocol;
|
fi->fib_nhs = nhs;
|
fi->fib_nhs = nhs;
|
fi->fib_flags = r->rtm_flags;
|
fi->fib_flags = r->rtm_flags;
|
if (rta->rta_priority)
|
if (rta->rta_priority)
|
fi->fib_priority = *rta->rta_priority;
|
fi->fib_priority = *rta->rta_priority;
|
if (rta->rta_mx) {
|
if (rta->rta_mx) {
|
int attrlen = RTA_PAYLOAD(rta->rta_mx);
|
int attrlen = RTA_PAYLOAD(rta->rta_mx);
|
struct rtattr *attr = RTA_DATA(rta->rta_mx);
|
struct rtattr *attr = RTA_DATA(rta->rta_mx);
|
|
|
while (RTA_OK(attr, attrlen)) {
|
while (RTA_OK(attr, attrlen)) {
|
unsigned flavor = attr->rta_type;
|
unsigned flavor = attr->rta_type;
|
if (flavor) {
|
if (flavor) {
|
if (flavor > RTAX_MAX)
|
if (flavor > RTAX_MAX)
|
goto err_inval;
|
goto err_inval;
|
fi->fib_metrics[flavor-1] = *(unsigned*)RTA_DATA(attr);
|
fi->fib_metrics[flavor-1] = *(unsigned*)RTA_DATA(attr);
|
}
|
}
|
attr = RTA_NEXT(attr, attrlen);
|
attr = RTA_NEXT(attr, attrlen);
|
}
|
}
|
}
|
}
|
if (rta->rta_prefsrc)
|
if (rta->rta_prefsrc)
|
memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 4);
|
memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 4);
|
|
|
if (rta->rta_mp) {
|
if (rta->rta_mp) {
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if ((err = fib_get_nhs(fi, rta->rta_mp, r)) != 0)
|
if ((err = fib_get_nhs(fi, rta->rta_mp, r)) != 0)
|
goto failure;
|
goto failure;
|
if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
|
if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
|
goto err_inval;
|
goto err_inval;
|
if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 4))
|
if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 4))
|
goto err_inval;
|
goto err_inval;
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
if (rta->rta_flow && memcmp(&fi->fib_nh->nh_tclassid, rta->rta_flow, 4))
|
if (rta->rta_flow && memcmp(&fi->fib_nh->nh_tclassid, rta->rta_flow, 4))
|
goto err_inval;
|
goto err_inval;
|
#endif
|
#endif
|
#else
|
#else
|
goto err_inval;
|
goto err_inval;
|
#endif
|
#endif
|
} else {
|
} else {
|
struct fib_nh *nh = fi->fib_nh;
|
struct fib_nh *nh = fi->fib_nh;
|
if (rta->rta_oif)
|
if (rta->rta_oif)
|
nh->nh_oif = *rta->rta_oif;
|
nh->nh_oif = *rta->rta_oif;
|
if (rta->rta_gw)
|
if (rta->rta_gw)
|
memcpy(&nh->nh_gw, rta->rta_gw, 4);
|
memcpy(&nh->nh_gw, rta->rta_gw, 4);
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
if (rta->rta_flow)
|
if (rta->rta_flow)
|
memcpy(&nh->nh_tclassid, rta->rta_flow, 4);
|
memcpy(&nh->nh_tclassid, rta->rta_flow, 4);
|
#endif
|
#endif
|
nh->nh_flags = r->rtm_flags;
|
nh->nh_flags = r->rtm_flags;
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
nh->nh_weight = 1;
|
nh->nh_weight = 1;
|
#endif
|
#endif
|
}
|
}
|
|
|
#ifdef CONFIG_IP_ROUTE_NAT
|
#ifdef CONFIG_IP_ROUTE_NAT
|
if (r->rtm_type == RTN_NAT) {
|
if (r->rtm_type == RTN_NAT) {
|
if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
|
if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
|
goto err_inval;
|
goto err_inval;
|
memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 4);
|
memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 4);
|
goto link_it;
|
goto link_it;
|
}
|
}
|
#endif
|
#endif
|
|
|
if (fib_props[r->rtm_type].error) {
|
if (fib_props[r->rtm_type].error) {
|
if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
|
if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
|
goto err_inval;
|
goto err_inval;
|
goto link_it;
|
goto link_it;
|
}
|
}
|
|
|
if (r->rtm_scope > RT_SCOPE_HOST)
|
if (r->rtm_scope > RT_SCOPE_HOST)
|
goto err_inval;
|
goto err_inval;
|
|
|
if (r->rtm_scope == RT_SCOPE_HOST) {
|
if (r->rtm_scope == RT_SCOPE_HOST) {
|
struct fib_nh *nh = fi->fib_nh;
|
struct fib_nh *nh = fi->fib_nh;
|
|
|
/* Local address is added. */
|
/* Local address is added. */
|
if (nhs != 1 || nh->nh_gw)
|
if (nhs != 1 || nh->nh_gw)
|
goto err_inval;
|
goto err_inval;
|
nh->nh_scope = RT_SCOPE_NOWHERE;
|
nh->nh_scope = RT_SCOPE_NOWHERE;
|
nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
|
nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
|
err = -ENODEV;
|
err = -ENODEV;
|
if (nh->nh_dev == NULL)
|
if (nh->nh_dev == NULL)
|
goto failure;
|
goto failure;
|
} else {
|
} else {
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if ((err = fib_check_nh(r, fi, nh)) != 0)
|
if ((err = fib_check_nh(r, fi, nh)) != 0)
|
goto failure;
|
goto failure;
|
} endfor_nexthops(fi)
|
} endfor_nexthops(fi)
|
}
|
}
|
|
|
if (fi->fib_prefsrc) {
|
if (fi->fib_prefsrc) {
|
if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
|
if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
|
memcmp(&fi->fib_prefsrc, rta->rta_dst, 4))
|
memcmp(&fi->fib_prefsrc, rta->rta_dst, 4))
|
if (inet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
|
if (inet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
|
goto err_inval;
|
goto err_inval;
|
}
|
}
|
|
|
link_it:
|
link_it:
|
if ((ofi = fib_find_info(fi)) != NULL) {
|
if ((ofi = fib_find_info(fi)) != NULL) {
|
fi->fib_dead = 1;
|
fi->fib_dead = 1;
|
free_fib_info(fi);
|
free_fib_info(fi);
|
ofi->fib_treeref++;
|
ofi->fib_treeref++;
|
return ofi;
|
return ofi;
|
}
|
}
|
|
|
fi->fib_treeref++;
|
fi->fib_treeref++;
|
atomic_inc(&fi->fib_clntref);
|
atomic_inc(&fi->fib_clntref);
|
write_lock(&fib_info_lock);
|
write_lock(&fib_info_lock);
|
fi->fib_next = fib_info_list;
|
fi->fib_next = fib_info_list;
|
fi->fib_prev = NULL;
|
fi->fib_prev = NULL;
|
if (fib_info_list)
|
if (fib_info_list)
|
fib_info_list->fib_prev = fi;
|
fib_info_list->fib_prev = fi;
|
fib_info_list = fi;
|
fib_info_list = fi;
|
write_unlock(&fib_info_lock);
|
write_unlock(&fib_info_lock);
|
return fi;
|
return fi;
|
|
|
err_inval:
|
err_inval:
|
err = -EINVAL;
|
err = -EINVAL;
|
|
|
failure:
|
failure:
|
*errp = err;
|
*errp = err;
|
if (fi) {
|
if (fi) {
|
fi->fib_dead = 1;
|
fi->fib_dead = 1;
|
free_fib_info(fi);
|
free_fib_info(fi);
|
}
|
}
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
int
|
int
|
fib_semantic_match(int type, struct fib_info *fi, const struct rt_key *key, struct fib_result *res)
|
fib_semantic_match(int type, struct fib_info *fi, const struct rt_key *key, struct fib_result *res)
|
{
|
{
|
int err = fib_props[type].error;
|
int err = fib_props[type].error;
|
|
|
if (err == 0) {
|
if (err == 0) {
|
if (fi->fib_flags&RTNH_F_DEAD)
|
if (fi->fib_flags&RTNH_F_DEAD)
|
return 1;
|
return 1;
|
|
|
res->fi = fi;
|
res->fi = fi;
|
|
|
switch (type) {
|
switch (type) {
|
#ifdef CONFIG_IP_ROUTE_NAT
|
#ifdef CONFIG_IP_ROUTE_NAT
|
case RTN_NAT:
|
case RTN_NAT:
|
FIB_RES_RESET(*res);
|
FIB_RES_RESET(*res);
|
atomic_inc(&fi->fib_clntref);
|
atomic_inc(&fi->fib_clntref);
|
return 0;
|
return 0;
|
#endif
|
#endif
|
case RTN_UNICAST:
|
case RTN_UNICAST:
|
case RTN_LOCAL:
|
case RTN_LOCAL:
|
case RTN_BROADCAST:
|
case RTN_BROADCAST:
|
case RTN_ANYCAST:
|
case RTN_ANYCAST:
|
case RTN_MULTICAST:
|
case RTN_MULTICAST:
|
for_nexthops(fi) {
|
for_nexthops(fi) {
|
if (nh->nh_flags&RTNH_F_DEAD)
|
if (nh->nh_flags&RTNH_F_DEAD)
|
continue;
|
continue;
|
if (!key->oif || key->oif == nh->nh_oif)
|
if (!key->oif || key->oif == nh->nh_oif)
|
break;
|
break;
|
}
|
}
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if (nhsel < fi->fib_nhs) {
|
if (nhsel < fi->fib_nhs) {
|
res->nh_sel = nhsel;
|
res->nh_sel = nhsel;
|
atomic_inc(&fi->fib_clntref);
|
atomic_inc(&fi->fib_clntref);
|
return 0;
|
return 0;
|
}
|
}
|
#else
|
#else
|
if (nhsel < 1) {
|
if (nhsel < 1) {
|
atomic_inc(&fi->fib_clntref);
|
atomic_inc(&fi->fib_clntref);
|
return 0;
|
return 0;
|
}
|
}
|
#endif
|
#endif
|
endfor_nexthops(fi);
|
endfor_nexthops(fi);
|
res->fi = NULL;
|
res->fi = NULL;
|
return 1;
|
return 1;
|
default:
|
default:
|
res->fi = NULL;
|
res->fi = NULL;
|
printk(KERN_DEBUG "impossible 102\n");
|
printk(KERN_DEBUG "impossible 102\n");
|
return -EINVAL;
|
return -EINVAL;
|
}
|
}
|
}
|
}
|
return err;
|
return err;
|
}
|
}
|
|
|
/* Find appropriate source address to this destination */
|
/* Find appropriate source address to this destination */
|
|
|
u32 __fib_res_prefsrc(struct fib_result *res)
|
u32 __fib_res_prefsrc(struct fib_result *res)
|
{
|
{
|
return inet_select_addr(FIB_RES_DEV(*res), FIB_RES_GW(*res), res->scope);
|
return inet_select_addr(FIB_RES_DEV(*res), FIB_RES_GW(*res), res->scope);
|
}
|
}
|
|
|
int
|
int
|
fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
|
fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
|
u8 tb_id, u8 type, u8 scope, void *dst, int dst_len, u8 tos,
|
u8 tb_id, u8 type, u8 scope, void *dst, int dst_len, u8 tos,
|
struct fib_info *fi)
|
struct fib_info *fi)
|
{
|
{
|
struct rtmsg *rtm;
|
struct rtmsg *rtm;
|
struct nlmsghdr *nlh;
|
struct nlmsghdr *nlh;
|
unsigned char *b = skb->tail;
|
unsigned char *b = skb->tail;
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
|
rtm = NLMSG_DATA(nlh);
|
rtm = NLMSG_DATA(nlh);
|
rtm->rtm_family = AF_INET;
|
rtm->rtm_family = AF_INET;
|
rtm->rtm_dst_len = dst_len;
|
rtm->rtm_dst_len = dst_len;
|
rtm->rtm_src_len = 0;
|
rtm->rtm_src_len = 0;
|
rtm->rtm_tos = tos;
|
rtm->rtm_tos = tos;
|
rtm->rtm_table = tb_id;
|
rtm->rtm_table = tb_id;
|
rtm->rtm_type = type;
|
rtm->rtm_type = type;
|
rtm->rtm_flags = fi->fib_flags;
|
rtm->rtm_flags = fi->fib_flags;
|
rtm->rtm_scope = scope;
|
rtm->rtm_scope = scope;
|
if (rtm->rtm_dst_len)
|
if (rtm->rtm_dst_len)
|
RTA_PUT(skb, RTA_DST, 4, dst);
|
RTA_PUT(skb, RTA_DST, 4, dst);
|
rtm->rtm_protocol = fi->fib_protocol;
|
rtm->rtm_protocol = fi->fib_protocol;
|
if (fi->fib_priority)
|
if (fi->fib_priority)
|
RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
|
RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
|
#ifdef CONFIG_NET_CLS_ROUTE
|
#ifdef CONFIG_NET_CLS_ROUTE
|
if (fi->fib_nh[0].nh_tclassid)
|
if (fi->fib_nh[0].nh_tclassid)
|
RTA_PUT(skb, RTA_FLOW, 4, &fi->fib_nh[0].nh_tclassid);
|
RTA_PUT(skb, RTA_FLOW, 4, &fi->fib_nh[0].nh_tclassid);
|
#endif
|
#endif
|
if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
|
if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
|
goto rtattr_failure;
|
goto rtattr_failure;
|
if (fi->fib_prefsrc)
|
if (fi->fib_prefsrc)
|
RTA_PUT(skb, RTA_PREFSRC, 4, &fi->fib_prefsrc);
|
RTA_PUT(skb, RTA_PREFSRC, 4, &fi->fib_prefsrc);
|
if (fi->fib_nhs == 1) {
|
if (fi->fib_nhs == 1) {
|
if (fi->fib_nh->nh_gw)
|
if (fi->fib_nh->nh_gw)
|
RTA_PUT(skb, RTA_GATEWAY, 4, &fi->fib_nh->nh_gw);
|
RTA_PUT(skb, RTA_GATEWAY, 4, &fi->fib_nh->nh_gw);
|
if (fi->fib_nh->nh_oif)
|
if (fi->fib_nh->nh_oif)
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
|
}
|
}
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if (fi->fib_nhs > 1) {
|
if (fi->fib_nhs > 1) {
|
struct rtnexthop *nhp;
|
struct rtnexthop *nhp;
|
struct rtattr *mp_head;
|
struct rtattr *mp_head;
|
if (skb_tailroom(skb) <= RTA_SPACE(0))
|
if (skb_tailroom(skb) <= RTA_SPACE(0))
|
goto rtattr_failure;
|
goto rtattr_failure;
|
mp_head = (struct rtattr*)skb_put(skb, RTA_SPACE(0));
|
mp_head = (struct rtattr*)skb_put(skb, RTA_SPACE(0));
|
|
|
for_nexthops(fi) {
|
for_nexthops(fi) {
|
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
|
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
|
goto rtattr_failure;
|
goto rtattr_failure;
|
nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
|
nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
|
nhp->rtnh_flags = nh->nh_flags & 0xFF;
|
nhp->rtnh_flags = nh->nh_flags & 0xFF;
|
nhp->rtnh_hops = nh->nh_weight-1;
|
nhp->rtnh_hops = nh->nh_weight-1;
|
nhp->rtnh_ifindex = nh->nh_oif;
|
nhp->rtnh_ifindex = nh->nh_oif;
|
if (nh->nh_gw)
|
if (nh->nh_gw)
|
RTA_PUT(skb, RTA_GATEWAY, 4, &nh->nh_gw);
|
RTA_PUT(skb, RTA_GATEWAY, 4, &nh->nh_gw);
|
nhp->rtnh_len = skb->tail - (unsigned char*)nhp;
|
nhp->rtnh_len = skb->tail - (unsigned char*)nhp;
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
mp_head->rta_type = RTA_MULTIPATH;
|
mp_head->rta_type = RTA_MULTIPATH;
|
mp_head->rta_len = skb->tail - (u8*)mp_head;
|
mp_head->rta_len = skb->tail - (u8*)mp_head;
|
}
|
}
|
#endif
|
#endif
|
nlh->nlmsg_len = skb->tail - b;
|
nlh->nlmsg_len = skb->tail - b;
|
return skb->len;
|
return skb->len;
|
|
|
nlmsg_failure:
|
nlmsg_failure:
|
rtattr_failure:
|
rtattr_failure:
|
skb_trim(skb, b - skb->data);
|
skb_trim(skb, b - skb->data);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
#ifndef CONFIG_IP_NOSIOCRT
|
#ifndef CONFIG_IP_NOSIOCRT
|
|
|
int
|
int
|
fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
|
fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
|
struct kern_rta *rta, struct rtentry *r)
|
struct kern_rta *rta, struct rtentry *r)
|
{
|
{
|
int plen;
|
int plen;
|
u32 *ptr;
|
u32 *ptr;
|
|
|
memset(rtm, 0, sizeof(*rtm));
|
memset(rtm, 0, sizeof(*rtm));
|
memset(rta, 0, sizeof(*rta));
|
memset(rta, 0, sizeof(*rta));
|
|
|
if (r->rt_dst.sa_family != AF_INET)
|
if (r->rt_dst.sa_family != AF_INET)
|
return -EAFNOSUPPORT;
|
return -EAFNOSUPPORT;
|
|
|
/* Check mask for validity:
|
/* Check mask for validity:
|
a) it must be contiguous.
|
a) it must be contiguous.
|
b) destination must have all host bits clear.
|
b) destination must have all host bits clear.
|
c) if application forgot to set correct family (AF_INET),
|
c) if application forgot to set correct family (AF_INET),
|
reject request unless it is absolutely clear i.e.
|
reject request unless it is absolutely clear i.e.
|
both family and mask are zero.
|
both family and mask are zero.
|
*/
|
*/
|
plen = 32;
|
plen = 32;
|
ptr = &((struct sockaddr_in*)&r->rt_dst)->sin_addr.s_addr;
|
ptr = &((struct sockaddr_in*)&r->rt_dst)->sin_addr.s_addr;
|
if (!(r->rt_flags&RTF_HOST)) {
|
if (!(r->rt_flags&RTF_HOST)) {
|
u32 mask = ((struct sockaddr_in*)&r->rt_genmask)->sin_addr.s_addr;
|
u32 mask = ((struct sockaddr_in*)&r->rt_genmask)->sin_addr.s_addr;
|
if (r->rt_genmask.sa_family != AF_INET) {
|
if (r->rt_genmask.sa_family != AF_INET) {
|
if (mask || r->rt_genmask.sa_family)
|
if (mask || r->rt_genmask.sa_family)
|
return -EAFNOSUPPORT;
|
return -EAFNOSUPPORT;
|
}
|
}
|
if (bad_mask(mask, *ptr))
|
if (bad_mask(mask, *ptr))
|
return -EINVAL;
|
return -EINVAL;
|
plen = inet_mask_len(mask);
|
plen = inet_mask_len(mask);
|
}
|
}
|
|
|
nl->nlmsg_flags = NLM_F_REQUEST;
|
nl->nlmsg_flags = NLM_F_REQUEST;
|
nl->nlmsg_pid = 0;
|
nl->nlmsg_pid = 0;
|
nl->nlmsg_seq = 0;
|
nl->nlmsg_seq = 0;
|
nl->nlmsg_len = NLMSG_LENGTH(sizeof(*rtm));
|
nl->nlmsg_len = NLMSG_LENGTH(sizeof(*rtm));
|
if (cmd == SIOCDELRT) {
|
if (cmd == SIOCDELRT) {
|
nl->nlmsg_type = RTM_DELROUTE;
|
nl->nlmsg_type = RTM_DELROUTE;
|
nl->nlmsg_flags = 0;
|
nl->nlmsg_flags = 0;
|
} else {
|
} else {
|
nl->nlmsg_type = RTM_NEWROUTE;
|
nl->nlmsg_type = RTM_NEWROUTE;
|
nl->nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE;
|
nl->nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE;
|
rtm->rtm_protocol = RTPROT_BOOT;
|
rtm->rtm_protocol = RTPROT_BOOT;
|
}
|
}
|
|
|
rtm->rtm_dst_len = plen;
|
rtm->rtm_dst_len = plen;
|
rta->rta_dst = ptr;
|
rta->rta_dst = ptr;
|
|
|
if (r->rt_metric) {
|
if (r->rt_metric) {
|
*(u32*)&r->rt_pad3 = r->rt_metric - 1;
|
*(u32*)&r->rt_pad3 = r->rt_metric - 1;
|
rta->rta_priority = (u32*)&r->rt_pad3;
|
rta->rta_priority = (u32*)&r->rt_pad3;
|
}
|
}
|
if (r->rt_flags&RTF_REJECT) {
|
if (r->rt_flags&RTF_REJECT) {
|
rtm->rtm_scope = RT_SCOPE_HOST;
|
rtm->rtm_scope = RT_SCOPE_HOST;
|
rtm->rtm_type = RTN_UNREACHABLE;
|
rtm->rtm_type = RTN_UNREACHABLE;
|
return 0;
|
return 0;
|
}
|
}
|
rtm->rtm_scope = RT_SCOPE_NOWHERE;
|
rtm->rtm_scope = RT_SCOPE_NOWHERE;
|
rtm->rtm_type = RTN_UNICAST;
|
rtm->rtm_type = RTN_UNICAST;
|
|
|
if (r->rt_dev) {
|
if (r->rt_dev) {
|
char *colon;
|
char *colon;
|
struct net_device *dev;
|
struct net_device *dev;
|
char devname[IFNAMSIZ];
|
char devname[IFNAMSIZ];
|
|
|
if (copy_from_user(devname, r->rt_dev, IFNAMSIZ-1))
|
if (copy_from_user(devname, r->rt_dev, IFNAMSIZ-1))
|
return -EFAULT;
|
return -EFAULT;
|
devname[IFNAMSIZ-1] = 0;
|
devname[IFNAMSIZ-1] = 0;
|
colon = strchr(devname, ':');
|
colon = strchr(devname, ':');
|
if (colon)
|
if (colon)
|
*colon = 0;
|
*colon = 0;
|
dev = __dev_get_by_name(devname);
|
dev = __dev_get_by_name(devname);
|
if (!dev)
|
if (!dev)
|
return -ENODEV;
|
return -ENODEV;
|
rta->rta_oif = &dev->ifindex;
|
rta->rta_oif = &dev->ifindex;
|
if (colon) {
|
if (colon) {
|
struct in_ifaddr *ifa;
|
struct in_ifaddr *ifa;
|
struct in_device *in_dev = __in_dev_get(dev);
|
struct in_device *in_dev = __in_dev_get(dev);
|
if (!in_dev)
|
if (!in_dev)
|
return -ENODEV;
|
return -ENODEV;
|
*colon = ':';
|
*colon = ':';
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
|
if (strcmp(ifa->ifa_label, devname) == 0)
|
if (strcmp(ifa->ifa_label, devname) == 0)
|
break;
|
break;
|
if (ifa == NULL)
|
if (ifa == NULL)
|
return -ENODEV;
|
return -ENODEV;
|
rta->rta_prefsrc = &ifa->ifa_local;
|
rta->rta_prefsrc = &ifa->ifa_local;
|
}
|
}
|
}
|
}
|
|
|
ptr = &((struct sockaddr_in*)&r->rt_gateway)->sin_addr.s_addr;
|
ptr = &((struct sockaddr_in*)&r->rt_gateway)->sin_addr.s_addr;
|
if (r->rt_gateway.sa_family == AF_INET && *ptr) {
|
if (r->rt_gateway.sa_family == AF_INET && *ptr) {
|
rta->rta_gw = ptr;
|
rta->rta_gw = ptr;
|
if (r->rt_flags&RTF_GATEWAY && inet_addr_type(*ptr) == RTN_UNICAST)
|
if (r->rt_flags&RTF_GATEWAY && inet_addr_type(*ptr) == RTN_UNICAST)
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
}
|
}
|
|
|
if (cmd == SIOCDELRT)
|
if (cmd == SIOCDELRT)
|
return 0;
|
return 0;
|
|
|
if (r->rt_flags&RTF_GATEWAY && rta->rta_gw == NULL)
|
if (r->rt_flags&RTF_GATEWAY && rta->rta_gw == NULL)
|
return -EINVAL;
|
return -EINVAL;
|
|
|
if (rtm->rtm_scope == RT_SCOPE_NOWHERE)
|
if (rtm->rtm_scope == RT_SCOPE_NOWHERE)
|
rtm->rtm_scope = RT_SCOPE_LINK;
|
rtm->rtm_scope = RT_SCOPE_LINK;
|
|
|
if (r->rt_flags&(RTF_MTU|RTF_WINDOW|RTF_IRTT)) {
|
if (r->rt_flags&(RTF_MTU|RTF_WINDOW|RTF_IRTT)) {
|
struct rtattr *rec;
|
struct rtattr *rec;
|
struct rtattr *mx = kmalloc(RTA_LENGTH(3*RTA_LENGTH(4)), GFP_KERNEL);
|
struct rtattr *mx = kmalloc(RTA_LENGTH(3*RTA_LENGTH(4)), GFP_KERNEL);
|
if (mx == NULL)
|
if (mx == NULL)
|
return -ENOMEM;
|
return -ENOMEM;
|
rta->rta_mx = mx;
|
rta->rta_mx = mx;
|
mx->rta_type = RTA_METRICS;
|
mx->rta_type = RTA_METRICS;
|
mx->rta_len = RTA_LENGTH(0);
|
mx->rta_len = RTA_LENGTH(0);
|
if (r->rt_flags&RTF_MTU) {
|
if (r->rt_flags&RTF_MTU) {
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec->rta_type = RTAX_ADVMSS;
|
rec->rta_type = RTAX_ADVMSS;
|
rec->rta_len = RTA_LENGTH(4);
|
rec->rta_len = RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
*(u32*)RTA_DATA(rec) = r->rt_mtu - 40;
|
*(u32*)RTA_DATA(rec) = r->rt_mtu - 40;
|
}
|
}
|
if (r->rt_flags&RTF_WINDOW) {
|
if (r->rt_flags&RTF_WINDOW) {
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec->rta_type = RTAX_WINDOW;
|
rec->rta_type = RTAX_WINDOW;
|
rec->rta_len = RTA_LENGTH(4);
|
rec->rta_len = RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
*(u32*)RTA_DATA(rec) = r->rt_window;
|
*(u32*)RTA_DATA(rec) = r->rt_window;
|
}
|
}
|
if (r->rt_flags&RTF_IRTT) {
|
if (r->rt_flags&RTF_IRTT) {
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec = (void*)((char*)mx + RTA_ALIGN(mx->rta_len));
|
rec->rta_type = RTAX_RTT;
|
rec->rta_type = RTAX_RTT;
|
rec->rta_len = RTA_LENGTH(4);
|
rec->rta_len = RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
mx->rta_len += RTA_LENGTH(4);
|
*(u32*)RTA_DATA(rec) = r->rt_irtt<<3;
|
*(u32*)RTA_DATA(rec) = r->rt_irtt<<3;
|
}
|
}
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
#endif
|
#endif
|
|
|
/*
|
/*
|
Update FIB if:
|
Update FIB if:
|
- local address disappeared -> we must delete all the entries
|
- local address disappeared -> we must delete all the entries
|
referring to it.
|
referring to it.
|
- device went down -> we must shutdown all nexthops going via it.
|
- device went down -> we must shutdown all nexthops going via it.
|
*/
|
*/
|
|
|
int fib_sync_down(u32 local, struct net_device *dev, int force)
|
int fib_sync_down(u32 local, struct net_device *dev, int force)
|
{
|
{
|
int ret = 0;
|
int ret = 0;
|
int scope = RT_SCOPE_NOWHERE;
|
int scope = RT_SCOPE_NOWHERE;
|
|
|
if (force)
|
if (force)
|
scope = -1;
|
scope = -1;
|
|
|
for_fib_info() {
|
for_fib_info() {
|
if (local && fi->fib_prefsrc == local) {
|
if (local && fi->fib_prefsrc == local) {
|
fi->fib_flags |= RTNH_F_DEAD;
|
fi->fib_flags |= RTNH_F_DEAD;
|
ret++;
|
ret++;
|
} else if (dev && fi->fib_nhs) {
|
} else if (dev && fi->fib_nhs) {
|
int dead = 0;
|
int dead = 0;
|
|
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if (nh->nh_flags&RTNH_F_DEAD)
|
if (nh->nh_flags&RTNH_F_DEAD)
|
dead++;
|
dead++;
|
else if (nh->nh_dev == dev &&
|
else if (nh->nh_dev == dev &&
|
nh->nh_scope != scope) {
|
nh->nh_scope != scope) {
|
nh->nh_flags |= RTNH_F_DEAD;
|
nh->nh_flags |= RTNH_F_DEAD;
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
spin_lock_bh(&fib_multipath_lock);
|
spin_lock_bh(&fib_multipath_lock);
|
fi->fib_power -= nh->nh_power;
|
fi->fib_power -= nh->nh_power;
|
nh->nh_power = 0;
|
nh->nh_power = 0;
|
spin_unlock_bh(&fib_multipath_lock);
|
spin_unlock_bh(&fib_multipath_lock);
|
#endif
|
#endif
|
dead++;
|
dead++;
|
}
|
}
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
if (force > 1 && nh->nh_dev == dev) {
|
if (force > 1 && nh->nh_dev == dev) {
|
dead = fi->fib_nhs;
|
dead = fi->fib_nhs;
|
break;
|
break;
|
}
|
}
|
#endif
|
#endif
|
} endfor_nexthops(fi)
|
} endfor_nexthops(fi)
|
if (dead == fi->fib_nhs) {
|
if (dead == fi->fib_nhs) {
|
fi->fib_flags |= RTNH_F_DEAD;
|
fi->fib_flags |= RTNH_F_DEAD;
|
ret++;
|
ret++;
|
}
|
}
|
}
|
}
|
} endfor_fib_info();
|
} endfor_fib_info();
|
return ret;
|
return ret;
|
}
|
}
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
|
/*
|
/*
|
Dead device goes up. We wake up dead nexthops.
|
Dead device goes up. We wake up dead nexthops.
|
It takes sense only on multipath routes.
|
It takes sense only on multipath routes.
|
*/
|
*/
|
|
|
int fib_sync_up(struct net_device *dev)
|
int fib_sync_up(struct net_device *dev)
|
{
|
{
|
int ret = 0;
|
int ret = 0;
|
|
|
if (!(dev->flags&IFF_UP))
|
if (!(dev->flags&IFF_UP))
|
return 0;
|
return 0;
|
|
|
for_fib_info() {
|
for_fib_info() {
|
int alive = 0;
|
int alive = 0;
|
|
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
alive++;
|
alive++;
|
continue;
|
continue;
|
}
|
}
|
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
|
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
|
continue;
|
continue;
|
if (nh->nh_dev != dev || __in_dev_get(dev) == NULL)
|
if (nh->nh_dev != dev || __in_dev_get(dev) == NULL)
|
continue;
|
continue;
|
alive++;
|
alive++;
|
spin_lock_bh(&fib_multipath_lock);
|
spin_lock_bh(&fib_multipath_lock);
|
nh->nh_power = 0;
|
nh->nh_power = 0;
|
nh->nh_flags &= ~RTNH_F_DEAD;
|
nh->nh_flags &= ~RTNH_F_DEAD;
|
spin_unlock_bh(&fib_multipath_lock);
|
spin_unlock_bh(&fib_multipath_lock);
|
} endfor_nexthops(fi)
|
} endfor_nexthops(fi)
|
|
|
if (alive > 0) {
|
if (alive > 0) {
|
fi->fib_flags &= ~RTNH_F_DEAD;
|
fi->fib_flags &= ~RTNH_F_DEAD;
|
ret++;
|
ret++;
|
}
|
}
|
} endfor_fib_info();
|
} endfor_fib_info();
|
return ret;
|
return ret;
|
}
|
}
|
|
|
/*
|
/*
|
The algorithm is suboptimal, but it provides really
|
The algorithm is suboptimal, but it provides really
|
fair weighted route distribution.
|
fair weighted route distribution.
|
*/
|
*/
|
|
|
void fib_select_multipath(const struct rt_key *key, struct fib_result *res)
|
void fib_select_multipath(const struct rt_key *key, struct fib_result *res)
|
{
|
{
|
struct fib_info *fi = res->fi;
|
struct fib_info *fi = res->fi;
|
int w;
|
int w;
|
|
|
spin_lock_bh(&fib_multipath_lock);
|
spin_lock_bh(&fib_multipath_lock);
|
if (fi->fib_power <= 0) {
|
if (fi->fib_power <= 0) {
|
int power = 0;
|
int power = 0;
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
power += nh->nh_weight;
|
power += nh->nh_weight;
|
nh->nh_power = nh->nh_weight;
|
nh->nh_power = nh->nh_weight;
|
}
|
}
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
fi->fib_power = power;
|
fi->fib_power = power;
|
if (power <= 0) {
|
if (power <= 0) {
|
spin_unlock_bh(&fib_multipath_lock);
|
spin_unlock_bh(&fib_multipath_lock);
|
/* Race condition: route has just become dead. */
|
/* Race condition: route has just become dead. */
|
res->nh_sel = 0;
|
res->nh_sel = 0;
|
return;
|
return;
|
}
|
}
|
}
|
}
|
|
|
|
|
/* w should be random number [0..fi->fib_power-1],
|
/* w should be random number [0..fi->fib_power-1],
|
it is pretty bad approximation.
|
it is pretty bad approximation.
|
*/
|
*/
|
|
|
w = jiffies % fi->fib_power;
|
w = jiffies % fi->fib_power;
|
|
|
change_nexthops(fi) {
|
change_nexthops(fi) {
|
if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
|
if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
|
if ((w -= nh->nh_power) <= 0) {
|
if ((w -= nh->nh_power) <= 0) {
|
nh->nh_power--;
|
nh->nh_power--;
|
fi->fib_power--;
|
fi->fib_power--;
|
res->nh_sel = nhsel;
|
res->nh_sel = nhsel;
|
spin_unlock_bh(&fib_multipath_lock);
|
spin_unlock_bh(&fib_multipath_lock);
|
return;
|
return;
|
}
|
}
|
}
|
}
|
} endfor_nexthops(fi);
|
} endfor_nexthops(fi);
|
|
|
/* Race condition: route has just become dead. */
|
/* Race condition: route has just become dead. */
|
res->nh_sel = 0;
|
res->nh_sel = 0;
|
spin_unlock_bh(&fib_multipath_lock);
|
spin_unlock_bh(&fib_multipath_lock);
|
}
|
}
|
#endif
|
#endif
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
#ifdef CONFIG_PROC_FS
|
|
|
static unsigned fib_flag_trans(int type, int dead, u32 mask, struct fib_info *fi)
|
static unsigned fib_flag_trans(int type, int dead, u32 mask, struct fib_info *fi)
|
{
|
{
|
static unsigned type2flags[RTN_MAX+1] = {
|
static unsigned type2flags[RTN_MAX+1] = {
|
0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
|
0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
|
};
|
};
|
unsigned flags = type2flags[type];
|
unsigned flags = type2flags[type];
|
|
|
if (fi && fi->fib_nh->nh_gw)
|
if (fi && fi->fib_nh->nh_gw)
|
flags |= RTF_GATEWAY;
|
flags |= RTF_GATEWAY;
|
if (mask == 0xFFFFFFFF)
|
if (mask == 0xFFFFFFFF)
|
flags |= RTF_HOST;
|
flags |= RTF_HOST;
|
if (!dead)
|
if (!dead)
|
flags |= RTF_UP;
|
flags |= RTF_UP;
|
return flags;
|
return flags;
|
}
|
}
|
|
|
void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer)
|
void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer)
|
{
|
{
|
int len;
|
int len;
|
unsigned flags = fib_flag_trans(type, dead, mask, fi);
|
unsigned flags = fib_flag_trans(type, dead, mask, fi);
|
|
|
if (fi) {
|
if (fi) {
|
len = sprintf(buffer, "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
|
len = sprintf(buffer, "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
|
fi->fib_dev ? fi->fib_dev->name : "*", prefix,
|
fi->fib_dev ? fi->fib_dev->name : "*", prefix,
|
fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
|
fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
|
mask, (fi->fib_advmss ? fi->fib_advmss+40 : 0),
|
mask, (fi->fib_advmss ? fi->fib_advmss+40 : 0),
|
fi->fib_window, fi->fib_rtt>>3);
|
fi->fib_window, fi->fib_rtt>>3);
|
} else {
|
} else {
|
len = sprintf(buffer, "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
|
len = sprintf(buffer, "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
|
prefix, 0,
|
prefix, 0,
|
flags, 0, 0, 0,
|
flags, 0, 0, 0,
|
mask, 0, 0, 0);
|
mask, 0, 0, 0);
|
}
|
}
|
memset(buffer+len, ' ', 127-len);
|
memset(buffer+len, ' ', 127-len);
|
buffer[127] = '\n';
|
buffer[127] = '\n';
|
}
|
}
|
|
|
#endif
|
#endif
|
|
|
