linux/net/ipv4/nexthop.c
David Ahern ce9ac056d9 nexthop: Fix fdb labeling for groups
fdb nexthops are marked with a flag. For standalone nexthops, a flag was
added to the nh_info struct. For groups that flag was added to struct
nexthop when it should have been added to the group information. Fix
by removing the flag from the nexthop struct and adding a flag to nh_group
that mirrors nh_info and is really only a caching of the individual types.
Add a helper, nexthop_is_fdb, for use by the vxlan code and fixup the
internal code to use the flag from either nh_info or nh_group.

v2
- propagate fdb_nh in remove_nh_grp_entry

Fixes: 38428d6871 ("nexthop: support for fdb ecmp nexthops")
Cc: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-10 13:18:40 -07:00

1981 lines
44 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Generic nexthop implementation
*
* Copyright (c) 2017-19 Cumulus Networks
* Copyright (c) 2017-19 David Ahern <dsa@cumulusnetworks.com>
*/
#include <linux/nexthop.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/arp.h>
#include <net/ipv6_stubs.h>
#include <net/lwtunnel.h>
#include <net/ndisc.h>
#include <net/nexthop.h>
#include <net/route.h>
#include <net/sock.h>
static void remove_nexthop(struct net *net, struct nexthop *nh,
struct nl_info *nlinfo);
#define NH_DEV_HASHBITS 8
#define NH_DEV_HASHSIZE (1U << NH_DEV_HASHBITS)
static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
[NHA_ID] = { .type = NLA_U32 },
[NHA_GROUP] = { .type = NLA_BINARY },
[NHA_GROUP_TYPE] = { .type = NLA_U16 },
[NHA_BLACKHOLE] = { .type = NLA_FLAG },
[NHA_OIF] = { .type = NLA_U32 },
[NHA_GATEWAY] = { .type = NLA_BINARY },
[NHA_ENCAP_TYPE] = { .type = NLA_U16 },
[NHA_ENCAP] = { .type = NLA_NESTED },
[NHA_GROUPS] = { .type = NLA_FLAG },
[NHA_MASTER] = { .type = NLA_U32 },
[NHA_FDB] = { .type = NLA_FLAG },
};
static int call_nexthop_notifiers(struct net *net,
enum nexthop_event_type event_type,
struct nexthop *nh)
{
int err;
err = atomic_notifier_call_chain(&net->nexthop.notifier_chain,
event_type, nh);
return notifier_to_errno(err);
}
static unsigned int nh_dev_hashfn(unsigned int val)
{
unsigned int mask = NH_DEV_HASHSIZE - 1;
return (val ^
(val >> NH_DEV_HASHBITS) ^
(val >> (NH_DEV_HASHBITS * 2))) & mask;
}
static void nexthop_devhash_add(struct net *net, struct nh_info *nhi)
{
struct net_device *dev = nhi->fib_nhc.nhc_dev;
struct hlist_head *head;
unsigned int hash;
WARN_ON(!dev);
hash = nh_dev_hashfn(dev->ifindex);
head = &net->nexthop.devhash[hash];
hlist_add_head(&nhi->dev_hash, head);
}
static void nexthop_free_mpath(struct nexthop *nh)
{
struct nh_group *nhg;
int i;
nhg = rcu_dereference_raw(nh->nh_grp);
for (i = 0; i < nhg->num_nh; ++i) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
WARN_ON(!list_empty(&nhge->nh_list));
nexthop_put(nhge->nh);
}
WARN_ON(nhg->spare == nhg);
kfree(nhg->spare);
kfree(nhg);
}
static void nexthop_free_single(struct nexthop *nh)
{
struct nh_info *nhi;
nhi = rcu_dereference_raw(nh->nh_info);
switch (nhi->family) {
case AF_INET:
fib_nh_release(nh->net, &nhi->fib_nh);
break;
case AF_INET6:
ipv6_stub->fib6_nh_release(&nhi->fib6_nh);
break;
}
kfree(nhi);
}
void nexthop_free_rcu(struct rcu_head *head)
{
struct nexthop *nh = container_of(head, struct nexthop, rcu);
if (nh->is_group)
nexthop_free_mpath(nh);
else
nexthop_free_single(nh);
kfree(nh);
}
EXPORT_SYMBOL_GPL(nexthop_free_rcu);
static struct nexthop *nexthop_alloc(void)
{
struct nexthop *nh;
nh = kzalloc(sizeof(struct nexthop), GFP_KERNEL);
if (nh) {
INIT_LIST_HEAD(&nh->fi_list);
INIT_LIST_HEAD(&nh->f6i_list);
INIT_LIST_HEAD(&nh->grp_list);
INIT_LIST_HEAD(&nh->fdb_list);
}
return nh;
}
static struct nh_group *nexthop_grp_alloc(u16 num_nh)
{
size_t sz = offsetof(struct nexthop, nh_grp)
+ sizeof(struct nh_group)
+ sizeof(struct nh_grp_entry) * num_nh;
struct nh_group *nhg;
nhg = kzalloc(sz, GFP_KERNEL);
if (nhg)
nhg->num_nh = num_nh;
return nhg;
}
static void nh_base_seq_inc(struct net *net)
{
while (++net->nexthop.seq == 0)
;
}
/* no reference taken; rcu lock or rtnl must be held */
struct nexthop *nexthop_find_by_id(struct net *net, u32 id)
{
struct rb_node **pp, *parent = NULL, *next;
pp = &net->nexthop.rb_root.rb_node;
while (1) {
struct nexthop *nh;
next = rcu_dereference_raw(*pp);
if (!next)
break;
parent = next;
nh = rb_entry(parent, struct nexthop, rb_node);
if (id < nh->id)
pp = &next->rb_left;
else if (id > nh->id)
pp = &next->rb_right;
else
return nh;
}
return NULL;
}
EXPORT_SYMBOL_GPL(nexthop_find_by_id);
/* used for auto id allocation; called with rtnl held */
static u32 nh_find_unused_id(struct net *net)
{
u32 id_start = net->nexthop.last_id_allocated;
while (1) {
net->nexthop.last_id_allocated++;
if (net->nexthop.last_id_allocated == id_start)
break;
if (!nexthop_find_by_id(net, net->nexthop.last_id_allocated))
return net->nexthop.last_id_allocated;
}
return 0;
}
static int nla_put_nh_group(struct sk_buff *skb, struct nh_group *nhg)
{
struct nexthop_grp *p;
size_t len = nhg->num_nh * sizeof(*p);
struct nlattr *nla;
u16 group_type = 0;
int i;
if (nhg->mpath)
group_type = NEXTHOP_GRP_TYPE_MPATH;
if (nla_put_u16(skb, NHA_GROUP_TYPE, group_type))
goto nla_put_failure;
nla = nla_reserve(skb, NHA_GROUP, len);
if (!nla)
goto nla_put_failure;
p = nla_data(nla);
for (i = 0; i < nhg->num_nh; ++i) {
p->id = nhg->nh_entries[i].nh->id;
p->weight = nhg->nh_entries[i].weight - 1;
p += 1;
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
int event, u32 portid, u32 seq, unsigned int nlflags)
{
struct fib6_nh *fib6_nh;
struct fib_nh *fib_nh;
struct nlmsghdr *nlh;
struct nh_info *nhi;
struct nhmsg *nhm;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nhm), nlflags);
if (!nlh)
return -EMSGSIZE;
nhm = nlmsg_data(nlh);
nhm->nh_family = AF_UNSPEC;
nhm->nh_flags = nh->nh_flags;
nhm->nh_protocol = nh->protocol;
nhm->nh_scope = 0;
nhm->resvd = 0;
if (nla_put_u32(skb, NHA_ID, nh->id))
goto nla_put_failure;
if (nh->is_group) {
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
if (nhg->fdb_nh && nla_put_flag(skb, NHA_FDB))
goto nla_put_failure;
if (nla_put_nh_group(skb, nhg))
goto nla_put_failure;
goto out;
}
nhi = rtnl_dereference(nh->nh_info);
nhm->nh_family = nhi->family;
if (nhi->reject_nh) {
if (nla_put_flag(skb, NHA_BLACKHOLE))
goto nla_put_failure;
goto out;
} else if (nhi->fdb_nh) {
if (nla_put_flag(skb, NHA_FDB))
goto nla_put_failure;
} else {
const struct net_device *dev;
dev = nhi->fib_nhc.nhc_dev;
if (dev && nla_put_u32(skb, NHA_OIF, dev->ifindex))
goto nla_put_failure;
}
nhm->nh_scope = nhi->fib_nhc.nhc_scope;
switch (nhi->family) {
case AF_INET:
fib_nh = &nhi->fib_nh;
if (fib_nh->fib_nh_gw_family &&
nla_put_u32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
goto nla_put_failure;
break;
case AF_INET6:
fib6_nh = &nhi->fib6_nh;
if (fib6_nh->fib_nh_gw_family &&
nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6))
goto nla_put_failure;
break;
}
if (nhi->fib_nhc.nhc_lwtstate &&
lwtunnel_fill_encap(skb, nhi->fib_nhc.nhc_lwtstate,
NHA_ENCAP, NHA_ENCAP_TYPE) < 0)
goto nla_put_failure;
out:
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static size_t nh_nlmsg_size_grp(struct nexthop *nh)
{
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
size_t sz = sizeof(struct nexthop_grp) * nhg->num_nh;
return nla_total_size(sz) +
nla_total_size(2); /* NHA_GROUP_TYPE */
}
static size_t nh_nlmsg_size_single(struct nexthop *nh)
{
struct nh_info *nhi = rtnl_dereference(nh->nh_info);
size_t sz;
/* covers NHA_BLACKHOLE since NHA_OIF and BLACKHOLE
* are mutually exclusive
*/
sz = nla_total_size(4); /* NHA_OIF */
switch (nhi->family) {
case AF_INET:
if (nhi->fib_nh.fib_nh_gw_family)
sz += nla_total_size(4); /* NHA_GATEWAY */
break;
case AF_INET6:
/* NHA_GATEWAY */
if (nhi->fib6_nh.fib_nh_gw_family)
sz += nla_total_size(sizeof(const struct in6_addr));
break;
}
if (nhi->fib_nhc.nhc_lwtstate) {
sz += lwtunnel_get_encap_size(nhi->fib_nhc.nhc_lwtstate);
sz += nla_total_size(2); /* NHA_ENCAP_TYPE */
}
return sz;
}
static size_t nh_nlmsg_size(struct nexthop *nh)
{
size_t sz = NLMSG_ALIGN(sizeof(struct nhmsg));
sz += nla_total_size(4); /* NHA_ID */
if (nh->is_group)
sz += nh_nlmsg_size_grp(nh);
else
sz += nh_nlmsg_size_single(nh);
return sz;
}
static void nexthop_notify(int event, struct nexthop *nh, struct nl_info *info)
{
unsigned int nlflags = info->nlh ? info->nlh->nlmsg_flags : 0;
u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(nh_nlmsg_size(nh), gfp_any());
if (!skb)
goto errout;
err = nh_fill_node(skb, nh, event, info->portid, seq, nlflags);
if (err < 0) {
/* -EMSGSIZE implies BUG in nh_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_NEXTHOP,
info->nlh, gfp_any());
return;
errout:
if (err < 0)
rtnl_set_sk_err(info->nl_net, RTNLGRP_NEXTHOP, err);
}
static bool valid_group_nh(struct nexthop *nh, unsigned int npaths,
bool *is_fdb, struct netlink_ext_ack *extack)
{
if (nh->is_group) {
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
/* nested multipath (group within a group) is not
* supported
*/
if (nhg->mpath) {
NL_SET_ERR_MSG(extack,
"Multipath group can not be a nexthop within a group");
return false;
}
*is_fdb = nhg->fdb_nh;
} else {
struct nh_info *nhi = rtnl_dereference(nh->nh_info);
if (nhi->reject_nh && npaths > 1) {
NL_SET_ERR_MSG(extack,
"Blackhole nexthop can not be used in a group with more than 1 path");
return false;
}
*is_fdb = nhi->fdb_nh;
}
return true;
}
static int nh_check_attr_fdb_group(struct nexthop *nh, u8 *nh_family,
struct netlink_ext_ack *extack)
{
struct nh_info *nhi;
nhi = rtnl_dereference(nh->nh_info);
if (!nhi->fdb_nh) {
NL_SET_ERR_MSG(extack, "FDB nexthop group can only have fdb nexthops");
return -EINVAL;
}
if (*nh_family == AF_UNSPEC) {
*nh_family = nhi->family;
} else if (*nh_family != nhi->family) {
NL_SET_ERR_MSG(extack, "FDB nexthop group cannot have mixed family nexthops");
return -EINVAL;
}
return 0;
}
static int nh_check_attr_group(struct net *net, struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
unsigned int len = nla_len(tb[NHA_GROUP]);
u8 nh_family = AF_UNSPEC;
struct nexthop_grp *nhg;
unsigned int i, j;
u8 nhg_fdb = 0;
if (len & (sizeof(struct nexthop_grp) - 1)) {
NL_SET_ERR_MSG(extack,
"Invalid length for nexthop group attribute");
return -EINVAL;
}
/* convert len to number of nexthop ids */
len /= sizeof(*nhg);
nhg = nla_data(tb[NHA_GROUP]);
for (i = 0; i < len; ++i) {
if (nhg[i].resvd1 || nhg[i].resvd2) {
NL_SET_ERR_MSG(extack, "Reserved fields in nexthop_grp must be 0");
return -EINVAL;
}
if (nhg[i].weight > 254) {
NL_SET_ERR_MSG(extack, "Invalid value for weight");
return -EINVAL;
}
for (j = i + 1; j < len; ++j) {
if (nhg[i].id == nhg[j].id) {
NL_SET_ERR_MSG(extack, "Nexthop id can not be used twice in a group");
return -EINVAL;
}
}
}
if (tb[NHA_FDB])
nhg_fdb = 1;
nhg = nla_data(tb[NHA_GROUP]);
for (i = 0; i < len; ++i) {
struct nexthop *nh;
bool is_fdb_nh;
nh = nexthop_find_by_id(net, nhg[i].id);
if (!nh) {
NL_SET_ERR_MSG(extack, "Invalid nexthop id");
return -EINVAL;
}
if (!valid_group_nh(nh, len, &is_fdb_nh, extack))
return -EINVAL;
if (nhg_fdb && nh_check_attr_fdb_group(nh, &nh_family, extack))
return -EINVAL;
if (!nhg_fdb && is_fdb_nh) {
NL_SET_ERR_MSG(extack, "Non FDB nexthop group cannot have fdb nexthops");
return -EINVAL;
}
}
for (i = NHA_GROUP_TYPE + 1; i < __NHA_MAX; ++i) {
if (!tb[i])
continue;
if (tb[NHA_FDB])
continue;
NL_SET_ERR_MSG(extack,
"No other attributes can be set in nexthop groups");
return -EINVAL;
}
return 0;
}
static bool ipv6_good_nh(const struct fib6_nh *nh)
{
int state = NUD_REACHABLE;
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref_stub(nh->fib_nh_dev, &nh->fib_nh_gw6);
if (n)
state = n->nud_state;
rcu_read_unlock_bh();
return !!(state & NUD_VALID);
}
static bool ipv4_good_nh(const struct fib_nh *nh)
{
int state = NUD_REACHABLE;
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv4_neigh_lookup_noref(nh->fib_nh_dev,
(__force u32)nh->fib_nh_gw4);
if (n)
state = n->nud_state;
rcu_read_unlock_bh();
return !!(state & NUD_VALID);
}
struct nexthop *nexthop_select_path(struct nexthop *nh, int hash)
{
struct nexthop *rc = NULL;
struct nh_group *nhg;
int i;
if (!nh->is_group)
return nh;
nhg = rcu_dereference(nh->nh_grp);
for (i = 0; i < nhg->num_nh; ++i) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
struct nh_info *nhi;
if (hash > atomic_read(&nhge->upper_bound))
continue;
nhi = rcu_dereference(nhge->nh->nh_info);
if (nhi->fdb_nh)
return nhge->nh;
/* nexthops always check if it is good and does
* not rely on a sysctl for this behavior
*/
switch (nhi->family) {
case AF_INET:
if (ipv4_good_nh(&nhi->fib_nh))
return nhge->nh;
break;
case AF_INET6:
if (ipv6_good_nh(&nhi->fib6_nh))
return nhge->nh;
break;
}
if (!rc)
rc = nhge->nh;
}
return rc;
}
EXPORT_SYMBOL_GPL(nexthop_select_path);
int nexthop_for_each_fib6_nh(struct nexthop *nh,
int (*cb)(struct fib6_nh *nh, void *arg),
void *arg)
{
struct nh_info *nhi;
int err;
if (nh->is_group) {
struct nh_group *nhg;
int i;
nhg = rcu_dereference_rtnl(nh->nh_grp);
for (i = 0; i < nhg->num_nh; i++) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
nhi = rcu_dereference_rtnl(nhge->nh->nh_info);
err = cb(&nhi->fib6_nh, arg);
if (err)
return err;
}
} else {
nhi = rcu_dereference_rtnl(nh->nh_info);
err = cb(&nhi->fib6_nh, arg);
if (err)
return err;
}
return 0;
}
EXPORT_SYMBOL_GPL(nexthop_for_each_fib6_nh);
static int check_src_addr(const struct in6_addr *saddr,
struct netlink_ext_ack *extack)
{
if (!ipv6_addr_any(saddr)) {
NL_SET_ERR_MSG(extack, "IPv6 routes using source address can not use nexthop objects");
return -EINVAL;
}
return 0;
}
int fib6_check_nexthop(struct nexthop *nh, struct fib6_config *cfg,
struct netlink_ext_ack *extack)
{
struct nh_info *nhi;
bool is_fdb_nh;
/* fib6_src is unique to a fib6_info and limits the ability to cache
* routes in fib6_nh within a nexthop that is potentially shared
* across multiple fib entries. If the config wants to use source
* routing it can not use nexthop objects. mlxsw also does not allow
* fib6_src on routes.
*/
if (cfg && check_src_addr(&cfg->fc_src, extack) < 0)
return -EINVAL;
if (nh->is_group) {
struct nh_group *nhg;
nhg = rtnl_dereference(nh->nh_grp);
if (nhg->has_v4)
goto no_v4_nh;
is_fdb_nh = nhg->fdb_nh;
} else {
nhi = rtnl_dereference(nh->nh_info);
if (nhi->family == AF_INET)
goto no_v4_nh;
is_fdb_nh = nhi->fdb_nh;
}
if (is_fdb_nh) {
NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
return -EINVAL;
}
return 0;
no_v4_nh:
NL_SET_ERR_MSG(extack, "IPv6 routes can not use an IPv4 nexthop");
return -EINVAL;
}
EXPORT_SYMBOL_GPL(fib6_check_nexthop);
/* if existing nexthop has ipv6 routes linked to it, need
* to verify this new spec works with ipv6
*/
static int fib6_check_nh_list(struct nexthop *old, struct nexthop *new,
struct netlink_ext_ack *extack)
{
struct fib6_info *f6i;
if (list_empty(&old->f6i_list))
return 0;
list_for_each_entry(f6i, &old->f6i_list, nh_list) {
if (check_src_addr(&f6i->fib6_src.addr, extack) < 0)
return -EINVAL;
}
return fib6_check_nexthop(new, NULL, extack);
}
static int nexthop_check_scope(struct nh_info *nhi, u8 scope,
struct netlink_ext_ack *extack)
{
if (scope == RT_SCOPE_HOST && nhi->fib_nhc.nhc_gw_family) {
NL_SET_ERR_MSG(extack,
"Route with host scope can not have a gateway");
return -EINVAL;
}
if (nhi->fib_nhc.nhc_flags & RTNH_F_ONLINK && scope >= RT_SCOPE_LINK) {
NL_SET_ERR_MSG(extack, "Scope mismatch with nexthop");
return -EINVAL;
}
return 0;
}
/* Invoked by fib add code to verify nexthop by id is ok with
* config for prefix; parts of fib_check_nh not done when nexthop
* object is used.
*/
int fib_check_nexthop(struct nexthop *nh, u8 scope,
struct netlink_ext_ack *extack)
{
struct nh_info *nhi;
int err = 0;
if (nh->is_group) {
struct nh_group *nhg;
nhg = rtnl_dereference(nh->nh_grp);
if (nhg->fdb_nh) {
NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
err = -EINVAL;
goto out;
}
if (scope == RT_SCOPE_HOST) {
NL_SET_ERR_MSG(extack, "Route with host scope can not have multiple nexthops");
err = -EINVAL;
goto out;
}
/* all nexthops in a group have the same scope */
nhi = rtnl_dereference(nhg->nh_entries[0].nh->nh_info);
err = nexthop_check_scope(nhi, scope, extack);
} else {
nhi = rtnl_dereference(nh->nh_info);
if (nhi->fdb_nh) {
NL_SET_ERR_MSG(extack, "Route cannot point to a fdb nexthop");
err = -EINVAL;
goto out;
}
err = nexthop_check_scope(nhi, scope, extack);
}
out:
return err;
}
static int fib_check_nh_list(struct nexthop *old, struct nexthop *new,
struct netlink_ext_ack *extack)
{
struct fib_info *fi;
list_for_each_entry(fi, &old->fi_list, nh_list) {
int err;
err = fib_check_nexthop(new, fi->fib_scope, extack);
if (err)
return err;
}
return 0;
}
static void nh_group_rebalance(struct nh_group *nhg)
{
int total = 0;
int w = 0;
int i;
for (i = 0; i < nhg->num_nh; ++i)
total += nhg->nh_entries[i].weight;
for (i = 0; i < nhg->num_nh; ++i) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
int upper_bound;
w += nhge->weight;
upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, total) - 1;
atomic_set(&nhge->upper_bound, upper_bound);
}
}
static void remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
struct nl_info *nlinfo)
{
struct nh_grp_entry *nhges, *new_nhges;
struct nexthop *nhp = nhge->nh_parent;
struct nexthop *nh = nhge->nh;
struct nh_group *nhg, *newg;
int i, j;
WARN_ON(!nh);
nhg = rtnl_dereference(nhp->nh_grp);
newg = nhg->spare;
/* last entry, keep it visible and remove the parent */
if (nhg->num_nh == 1) {
remove_nexthop(net, nhp, nlinfo);
return;
}
newg->has_v4 = nhg->has_v4;
newg->mpath = nhg->mpath;
newg->fdb_nh = nhg->fdb_nh;
newg->num_nh = nhg->num_nh;
/* copy old entries to new except the one getting removed */
nhges = nhg->nh_entries;
new_nhges = newg->nh_entries;
for (i = 0, j = 0; i < nhg->num_nh; ++i) {
/* current nexthop getting removed */
if (nhg->nh_entries[i].nh == nh) {
newg->num_nh--;
continue;
}
list_del(&nhges[i].nh_list);
new_nhges[j].nh_parent = nhges[i].nh_parent;
new_nhges[j].nh = nhges[i].nh;
new_nhges[j].weight = nhges[i].weight;
list_add(&new_nhges[j].nh_list, &new_nhges[j].nh->grp_list);
j++;
}
nh_group_rebalance(newg);
rcu_assign_pointer(nhp->nh_grp, newg);
list_del(&nhge->nh_list);
nexthop_put(nhge->nh);
if (nlinfo)
nexthop_notify(RTM_NEWNEXTHOP, nhp, nlinfo);
}
static void remove_nexthop_from_groups(struct net *net, struct nexthop *nh,
struct nl_info *nlinfo)
{
struct nh_grp_entry *nhge, *tmp;
list_for_each_entry_safe(nhge, tmp, &nh->grp_list, nh_list)
remove_nh_grp_entry(net, nhge, nlinfo);
/* make sure all see the newly published array before releasing rtnl */
synchronize_rcu();
}
static void remove_nexthop_group(struct nexthop *nh, struct nl_info *nlinfo)
{
struct nh_group *nhg = rcu_dereference_rtnl(nh->nh_grp);
int i, num_nh = nhg->num_nh;
for (i = 0; i < num_nh; ++i) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
if (WARN_ON(!nhge->nh))
continue;
list_del_init(&nhge->nh_list);
}
}
/* not called for nexthop replace */
static void __remove_nexthop_fib(struct net *net, struct nexthop *nh)
{
struct fib6_info *f6i, *tmp;
bool do_flush = false;
struct fib_info *fi;
call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh);
list_for_each_entry(fi, &nh->fi_list, nh_list) {
fi->fib_flags |= RTNH_F_DEAD;
do_flush = true;
}
if (do_flush)
fib_flush(net);
/* ip6_del_rt removes the entry from this list hence the _safe */
list_for_each_entry_safe(f6i, tmp, &nh->f6i_list, nh_list) {
/* __ip6_del_rt does a release, so do a hold here */
fib6_info_hold(f6i);
ipv6_stub->ip6_del_rt(net, f6i,
!net->ipv4.sysctl_nexthop_compat_mode);
}
}
static void __remove_nexthop(struct net *net, struct nexthop *nh,
struct nl_info *nlinfo)
{
__remove_nexthop_fib(net, nh);
if (nh->is_group) {
remove_nexthop_group(nh, nlinfo);
} else {
struct nh_info *nhi;
nhi = rtnl_dereference(nh->nh_info);
if (nhi->fib_nhc.nhc_dev)
hlist_del(&nhi->dev_hash);
remove_nexthop_from_groups(net, nh, nlinfo);
}
}
static void remove_nexthop(struct net *net, struct nexthop *nh,
struct nl_info *nlinfo)
{
/* remove from the tree */
rb_erase(&nh->rb_node, &net->nexthop.rb_root);
if (nlinfo)
nexthop_notify(RTM_DELNEXTHOP, nh, nlinfo);
__remove_nexthop(net, nh, nlinfo);
nh_base_seq_inc(net);
nexthop_put(nh);
}
/* if any FIB entries reference this nexthop, any dst entries
* need to be regenerated
*/
static void nh_rt_cache_flush(struct net *net, struct nexthop *nh)
{
struct fib6_info *f6i;
if (!list_empty(&nh->fi_list))
rt_cache_flush(net);
list_for_each_entry(f6i, &nh->f6i_list, nh_list)
ipv6_stub->fib6_update_sernum(net, f6i);
}
static int replace_nexthop_grp(struct net *net, struct nexthop *old,
struct nexthop *new,
struct netlink_ext_ack *extack)
{
struct nh_group *oldg, *newg;
int i;
if (!new->is_group) {
NL_SET_ERR_MSG(extack, "Can not replace a nexthop group with a nexthop.");
return -EINVAL;
}
oldg = rtnl_dereference(old->nh_grp);
newg = rtnl_dereference(new->nh_grp);
/* update parents - used by nexthop code for cleanup */
for (i = 0; i < newg->num_nh; i++)
newg->nh_entries[i].nh_parent = old;
rcu_assign_pointer(old->nh_grp, newg);
for (i = 0; i < oldg->num_nh; i++)
oldg->nh_entries[i].nh_parent = new;
rcu_assign_pointer(new->nh_grp, oldg);
return 0;
}
static int replace_nexthop_single(struct net *net, struct nexthop *old,
struct nexthop *new,
struct netlink_ext_ack *extack)
{
struct nh_info *oldi, *newi;
if (new->is_group) {
NL_SET_ERR_MSG(extack, "Can not replace a nexthop with a nexthop group.");
return -EINVAL;
}
oldi = rtnl_dereference(old->nh_info);
newi = rtnl_dereference(new->nh_info);
newi->nh_parent = old;
oldi->nh_parent = new;
old->protocol = new->protocol;
old->nh_flags = new->nh_flags;
rcu_assign_pointer(old->nh_info, newi);
rcu_assign_pointer(new->nh_info, oldi);
return 0;
}
static void __nexthop_replace_notify(struct net *net, struct nexthop *nh,
struct nl_info *info)
{
struct fib6_info *f6i;
if (!list_empty(&nh->fi_list)) {
struct fib_info *fi;
/* expectation is a few fib_info per nexthop and then
* a lot of routes per fib_info. So mark the fib_info
* and then walk the fib tables once
*/
list_for_each_entry(fi, &nh->fi_list, nh_list)
fi->nh_updated = true;
fib_info_notify_update(net, info);
list_for_each_entry(fi, &nh->fi_list, nh_list)
fi->nh_updated = false;
}
list_for_each_entry(f6i, &nh->f6i_list, nh_list)
ipv6_stub->fib6_rt_update(net, f6i, info);
}
/* send RTM_NEWROUTE with REPLACE flag set for all FIB entries
* linked to this nexthop and for all groups that the nexthop
* is a member of
*/
static void nexthop_replace_notify(struct net *net, struct nexthop *nh,
struct nl_info *info)
{
struct nh_grp_entry *nhge;
__nexthop_replace_notify(net, nh, info);
list_for_each_entry(nhge, &nh->grp_list, nh_list)
__nexthop_replace_notify(net, nhge->nh_parent, info);
}
static int replace_nexthop(struct net *net, struct nexthop *old,
struct nexthop *new, struct netlink_ext_ack *extack)
{
bool new_is_reject = false;
struct nh_grp_entry *nhge;
int err;
/* check that existing FIB entries are ok with the
* new nexthop definition
*/
err = fib_check_nh_list(old, new, extack);
if (err)
return err;
err = fib6_check_nh_list(old, new, extack);
if (err)
return err;
if (!new->is_group) {
struct nh_info *nhi = rtnl_dereference(new->nh_info);
new_is_reject = nhi->reject_nh;
}
list_for_each_entry(nhge, &old->grp_list, nh_list) {
/* if new nexthop is a blackhole, any groups using this
* nexthop cannot have more than 1 path
*/
if (new_is_reject &&
nexthop_num_path(nhge->nh_parent) > 1) {
NL_SET_ERR_MSG(extack, "Blackhole nexthop can not be a member of a group with more than one path");
return -EINVAL;
}
err = fib_check_nh_list(nhge->nh_parent, new, extack);
if (err)
return err;
err = fib6_check_nh_list(nhge->nh_parent, new, extack);
if (err)
return err;
}
if (old->is_group)
err = replace_nexthop_grp(net, old, new, extack);
else
err = replace_nexthop_single(net, old, new, extack);
if (!err) {
nh_rt_cache_flush(net, old);
__remove_nexthop(net, new, NULL);
nexthop_put(new);
}
return err;
}
/* called with rtnl_lock held */
static int insert_nexthop(struct net *net, struct nexthop *new_nh,
struct nh_config *cfg, struct netlink_ext_ack *extack)
{
struct rb_node **pp, *parent = NULL, *next;
struct rb_root *root = &net->nexthop.rb_root;
bool replace = !!(cfg->nlflags & NLM_F_REPLACE);
bool create = !!(cfg->nlflags & NLM_F_CREATE);
u32 new_id = new_nh->id;
int replace_notify = 0;
int rc = -EEXIST;
pp = &root->rb_node;
while (1) {
struct nexthop *nh;
next = rtnl_dereference(*pp);
if (!next)
break;
parent = next;
nh = rb_entry(parent, struct nexthop, rb_node);
if (new_id < nh->id) {
pp = &next->rb_left;
} else if (new_id > nh->id) {
pp = &next->rb_right;
} else if (replace) {
rc = replace_nexthop(net, nh, new_nh, extack);
if (!rc) {
new_nh = nh; /* send notification with old nh */
replace_notify = 1;
}
goto out;
} else {
/* id already exists and not a replace */
goto out;
}
}
if (replace && !create) {
NL_SET_ERR_MSG(extack, "Replace specified without create and no entry exists");
rc = -ENOENT;
goto out;
}
rb_link_node_rcu(&new_nh->rb_node, parent, pp);
rb_insert_color(&new_nh->rb_node, root);
rc = 0;
out:
if (!rc) {
nh_base_seq_inc(net);
nexthop_notify(RTM_NEWNEXTHOP, new_nh, &cfg->nlinfo);
if (replace_notify && net->ipv4.sysctl_nexthop_compat_mode)
nexthop_replace_notify(net, new_nh, &cfg->nlinfo);
}
return rc;
}
/* rtnl */
/* remove all nexthops tied to a device being deleted */
static void nexthop_flush_dev(struct net_device *dev)
{
unsigned int hash = nh_dev_hashfn(dev->ifindex);
struct net *net = dev_net(dev);
struct hlist_head *head = &net->nexthop.devhash[hash];
struct hlist_node *n;
struct nh_info *nhi;
hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
if (nhi->fib_nhc.nhc_dev != dev)
continue;
remove_nexthop(net, nhi->nh_parent, NULL);
}
}
/* rtnl; called when net namespace is deleted */
static void flush_all_nexthops(struct net *net)
{
struct rb_root *root = &net->nexthop.rb_root;
struct rb_node *node;
struct nexthop *nh;
while ((node = rb_first(root))) {
nh = rb_entry(node, struct nexthop, rb_node);
remove_nexthop(net, nh, NULL);
cond_resched();
}
}
static struct nexthop *nexthop_create_group(struct net *net,
struct nh_config *cfg)
{
struct nlattr *grps_attr = cfg->nh_grp;
struct nexthop_grp *entry = nla_data(grps_attr);
u16 num_nh = nla_len(grps_attr) / sizeof(*entry);
struct nh_group *nhg;
struct nexthop *nh;
int i;
nh = nexthop_alloc();
if (!nh)
return ERR_PTR(-ENOMEM);
nh->is_group = 1;
nhg = nexthop_grp_alloc(num_nh);
if (!nhg) {
kfree(nh);
return ERR_PTR(-ENOMEM);
}
/* spare group used for removals */
nhg->spare = nexthop_grp_alloc(num_nh);
if (!nhg->spare) {
kfree(nhg);
kfree(nh);
return ERR_PTR(-ENOMEM);
}
nhg->spare->spare = nhg;
for (i = 0; i < nhg->num_nh; ++i) {
struct nexthop *nhe;
struct nh_info *nhi;
nhe = nexthop_find_by_id(net, entry[i].id);
if (!nexthop_get(nhe))
goto out_no_nh;
nhi = rtnl_dereference(nhe->nh_info);
if (nhi->family == AF_INET)
nhg->has_v4 = true;
nhg->nh_entries[i].nh = nhe;
nhg->nh_entries[i].weight = entry[i].weight + 1;
list_add(&nhg->nh_entries[i].nh_list, &nhe->grp_list);
nhg->nh_entries[i].nh_parent = nh;
}
if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) {
nhg->mpath = 1;
nh_group_rebalance(nhg);
}
if (cfg->nh_fdb)
nhg->fdb_nh = 1;
rcu_assign_pointer(nh->nh_grp, nhg);
return nh;
out_no_nh:
for (; i >= 0; --i)
nexthop_put(nhg->nh_entries[i].nh);
kfree(nhg->spare);
kfree(nhg);
kfree(nh);
return ERR_PTR(-ENOENT);
}
static int nh_create_ipv4(struct net *net, struct nexthop *nh,
struct nh_info *nhi, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct fib_nh *fib_nh = &nhi->fib_nh;
struct fib_config fib_cfg = {
.fc_oif = cfg->nh_ifindex,
.fc_gw4 = cfg->gw.ipv4,
.fc_gw_family = cfg->gw.ipv4 ? AF_INET : 0,
.fc_flags = cfg->nh_flags,
.fc_encap = cfg->nh_encap,
.fc_encap_type = cfg->nh_encap_type,
};
u32 tb_id = (cfg->dev ? l3mdev_fib_table(cfg->dev) : RT_TABLE_MAIN);
int err;
err = fib_nh_init(net, fib_nh, &fib_cfg, 1, extack);
if (err) {
fib_nh_release(net, fib_nh);
goto out;
}
if (nhi->fdb_nh)
goto out;
/* sets nh_dev if successful */
err = fib_check_nh(net, fib_nh, tb_id, 0, extack);
if (!err) {
nh->nh_flags = fib_nh->fib_nh_flags;
fib_info_update_nhc_saddr(net, &fib_nh->nh_common,
fib_nh->fib_nh_scope);
} else {
fib_nh_release(net, fib_nh);
}
out:
return err;
}
static int nh_create_ipv6(struct net *net, struct nexthop *nh,
struct nh_info *nhi, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct fib6_nh *fib6_nh = &nhi->fib6_nh;
struct fib6_config fib6_cfg = {
.fc_table = l3mdev_fib_table(cfg->dev),
.fc_ifindex = cfg->nh_ifindex,
.fc_gateway = cfg->gw.ipv6,
.fc_flags = cfg->nh_flags,
.fc_encap = cfg->nh_encap,
.fc_encap_type = cfg->nh_encap_type,
.fc_is_fdb = cfg->nh_fdb,
};
int err;
if (!ipv6_addr_any(&cfg->gw.ipv6))
fib6_cfg.fc_flags |= RTF_GATEWAY;
/* sets nh_dev if successful */
err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL,
extack);
if (err)
ipv6_stub->fib6_nh_release(fib6_nh);
else
nh->nh_flags = fib6_nh->fib_nh_flags;
return err;
}
static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct nh_info *nhi;
struct nexthop *nh;
int err = 0;
nh = nexthop_alloc();
if (!nh)
return ERR_PTR(-ENOMEM);
nhi = kzalloc(sizeof(*nhi), GFP_KERNEL);
if (!nhi) {
kfree(nh);
return ERR_PTR(-ENOMEM);
}
nh->nh_flags = cfg->nh_flags;
nh->net = net;
nhi->nh_parent = nh;
nhi->family = cfg->nh_family;
nhi->fib_nhc.nhc_scope = RT_SCOPE_LINK;
if (cfg->nh_fdb)
nhi->fdb_nh = 1;
if (cfg->nh_blackhole) {
nhi->reject_nh = 1;
cfg->nh_ifindex = net->loopback_dev->ifindex;
}
switch (cfg->nh_family) {
case AF_INET:
err = nh_create_ipv4(net, nh, nhi, cfg, extack);
break;
case AF_INET6:
err = nh_create_ipv6(net, nh, nhi, cfg, extack);
break;
}
if (err) {
kfree(nhi);
kfree(nh);
return ERR_PTR(err);
}
/* add the entry to the device based hash */
if (!nhi->fdb_nh)
nexthop_devhash_add(net, nhi);
rcu_assign_pointer(nh->nh_info, nhi);
return nh;
}
/* called with rtnl lock held */
static struct nexthop *nexthop_add(struct net *net, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct nexthop *nh;
int err;
if (cfg->nlflags & NLM_F_REPLACE && !cfg->nh_id) {
NL_SET_ERR_MSG(extack, "Replace requires nexthop id");
return ERR_PTR(-EINVAL);
}
if (!cfg->nh_id) {
cfg->nh_id = nh_find_unused_id(net);
if (!cfg->nh_id) {
NL_SET_ERR_MSG(extack, "No unused id");
return ERR_PTR(-EINVAL);
}
}
if (cfg->nh_grp)
nh = nexthop_create_group(net, cfg);
else
nh = nexthop_create(net, cfg, extack);
if (IS_ERR(nh))
return nh;
refcount_set(&nh->refcnt, 1);
nh->id = cfg->nh_id;
nh->protocol = cfg->nh_protocol;
nh->net = net;
err = insert_nexthop(net, nh, cfg, extack);
if (err) {
__remove_nexthop(net, nh, NULL);
nexthop_put(nh);
nh = ERR_PTR(err);
}
return nh;
}
static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct nhmsg *nhm = nlmsg_data(nlh);
struct nlattr *tb[NHA_MAX + 1];
int err;
err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy,
extack);
if (err < 0)
return err;
err = -EINVAL;
if (nhm->resvd || nhm->nh_scope) {
NL_SET_ERR_MSG(extack, "Invalid values in ancillary header");
goto out;
}
if (nhm->nh_flags & ~NEXTHOP_VALID_USER_FLAGS) {
NL_SET_ERR_MSG(extack, "Invalid nexthop flags in ancillary header");
goto out;
}
switch (nhm->nh_family) {
case AF_INET:
case AF_INET6:
break;
case AF_UNSPEC:
if (tb[NHA_GROUP])
break;
fallthrough;
default:
NL_SET_ERR_MSG(extack, "Invalid address family");
goto out;
}
if (tb[NHA_GROUPS] || tb[NHA_MASTER]) {
NL_SET_ERR_MSG(extack, "Invalid attributes in request");
goto out;
}
memset(cfg, 0, sizeof(*cfg));
cfg->nlflags = nlh->nlmsg_flags;
cfg->nlinfo.portid = NETLINK_CB(skb).portid;
cfg->nlinfo.nlh = nlh;
cfg->nlinfo.nl_net = net;
cfg->nh_family = nhm->nh_family;
cfg->nh_protocol = nhm->nh_protocol;
cfg->nh_flags = nhm->nh_flags;
if (tb[NHA_ID])
cfg->nh_id = nla_get_u32(tb[NHA_ID]);
if (tb[NHA_FDB]) {
if (tb[NHA_OIF] || tb[NHA_BLACKHOLE] ||
tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE]) {
NL_SET_ERR_MSG(extack, "Fdb attribute can not be used with encap, oif or blackhole");
goto out;
}
if (nhm->nh_flags) {
NL_SET_ERR_MSG(extack, "Unsupported nexthop flags in ancillary header");
goto out;
}
cfg->nh_fdb = nla_get_flag(tb[NHA_FDB]);
}
if (tb[NHA_GROUP]) {
if (nhm->nh_family != AF_UNSPEC) {
NL_SET_ERR_MSG(extack, "Invalid family for group");
goto out;
}
cfg->nh_grp = tb[NHA_GROUP];
cfg->nh_grp_type = NEXTHOP_GRP_TYPE_MPATH;
if (tb[NHA_GROUP_TYPE])
cfg->nh_grp_type = nla_get_u16(tb[NHA_GROUP_TYPE]);
if (cfg->nh_grp_type > NEXTHOP_GRP_TYPE_MAX) {
NL_SET_ERR_MSG(extack, "Invalid group type");
goto out;
}
err = nh_check_attr_group(net, tb, extack);
/* no other attributes should be set */
goto out;
}
if (tb[NHA_BLACKHOLE]) {
if (tb[NHA_GATEWAY] || tb[NHA_OIF] ||
tb[NHA_ENCAP] || tb[NHA_ENCAP_TYPE] || tb[NHA_FDB]) {
NL_SET_ERR_MSG(extack, "Blackhole attribute can not be used with gateway, oif, encap or fdb");
goto out;
}
cfg->nh_blackhole = 1;
err = 0;
goto out;
}
if (!cfg->nh_fdb && !tb[NHA_OIF]) {
NL_SET_ERR_MSG(extack, "Device attribute required for non-blackhole and non-fdb nexthops");
goto out;
}
if (!cfg->nh_fdb && tb[NHA_OIF]) {
cfg->nh_ifindex = nla_get_u32(tb[NHA_OIF]);
if (cfg->nh_ifindex)
cfg->dev = __dev_get_by_index(net, cfg->nh_ifindex);
if (!cfg->dev) {
NL_SET_ERR_MSG(extack, "Invalid device index");
goto out;
} else if (!(cfg->dev->flags & IFF_UP)) {
NL_SET_ERR_MSG(extack, "Nexthop device is not up");
err = -ENETDOWN;
goto out;
} else if (!netif_carrier_ok(cfg->dev)) {
NL_SET_ERR_MSG(extack, "Carrier for nexthop device is down");
err = -ENETDOWN;
goto out;
}
}
err = -EINVAL;
if (tb[NHA_GATEWAY]) {
struct nlattr *gwa = tb[NHA_GATEWAY];
switch (cfg->nh_family) {
case AF_INET:
if (nla_len(gwa) != sizeof(u32)) {
NL_SET_ERR_MSG(extack, "Invalid gateway");
goto out;
}
cfg->gw.ipv4 = nla_get_be32(gwa);
break;
case AF_INET6:
if (nla_len(gwa) != sizeof(struct in6_addr)) {
NL_SET_ERR_MSG(extack, "Invalid gateway");
goto out;
}
cfg->gw.ipv6 = nla_get_in6_addr(gwa);
break;
default:
NL_SET_ERR_MSG(extack,
"Unknown address family for gateway");
goto out;
}
} else {
/* device only nexthop (no gateway) */
if (cfg->nh_flags & RTNH_F_ONLINK) {
NL_SET_ERR_MSG(extack,
"ONLINK flag can not be set for nexthop without a gateway");
goto out;
}
}
if (tb[NHA_ENCAP]) {
cfg->nh_encap = tb[NHA_ENCAP];
if (!tb[NHA_ENCAP_TYPE]) {
NL_SET_ERR_MSG(extack, "LWT encapsulation type is missing");
goto out;
}
cfg->nh_encap_type = nla_get_u16(tb[NHA_ENCAP_TYPE]);
err = lwtunnel_valid_encap_type(cfg->nh_encap_type, extack);
if (err < 0)
goto out;
} else if (tb[NHA_ENCAP_TYPE]) {
NL_SET_ERR_MSG(extack, "LWT encapsulation attribute is missing");
goto out;
}
err = 0;
out:
return err;
}
/* rtnl */
static int rtm_new_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct nh_config cfg;
struct nexthop *nh;
int err;
err = rtm_to_nh_config(net, skb, nlh, &cfg, extack);
if (!err) {
nh = nexthop_add(net, &cfg, extack);
if (IS_ERR(nh))
err = PTR_ERR(nh);
}
return err;
}
static int nh_valid_get_del_req(struct nlmsghdr *nlh, u32 *id,
struct netlink_ext_ack *extack)
{
struct nhmsg *nhm = nlmsg_data(nlh);
struct nlattr *tb[NHA_MAX + 1];
int err, i;
err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy,
extack);
if (err < 0)
return err;
err = -EINVAL;
for (i = 0; i < __NHA_MAX; ++i) {
if (!tb[i])
continue;
switch (i) {
case NHA_ID:
break;
default:
NL_SET_ERR_MSG_ATTR(extack, tb[i],
"Unexpected attribute in request");
goto out;
}
}
if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
NL_SET_ERR_MSG(extack, "Invalid values in header");
goto out;
}
if (!tb[NHA_ID]) {
NL_SET_ERR_MSG(extack, "Nexthop id is missing");
goto out;
}
*id = nla_get_u32(tb[NHA_ID]);
if (!(*id))
NL_SET_ERR_MSG(extack, "Invalid nexthop id");
else
err = 0;
out:
return err;
}
/* rtnl */
static int rtm_del_nexthop(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct nl_info nlinfo = {
.nlh = nlh,
.nl_net = net,
.portid = NETLINK_CB(skb).portid,
};
struct nexthop *nh;
int err;
u32 id;
err = nh_valid_get_del_req(nlh, &id, extack);
if (err)
return err;
nh = nexthop_find_by_id(net, id);
if (!nh)
return -ENOENT;
remove_nexthop(net, nh, &nlinfo);
return 0;
}
/* rtnl */
static int rtm_get_nexthop(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
struct sk_buff *skb = NULL;
struct nexthop *nh;
int err;
u32 id;
err = nh_valid_get_del_req(nlh, &id, extack);
if (err)
return err;
err = -ENOBUFS;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
goto out;
err = -ENOENT;
nh = nexthop_find_by_id(net, id);
if (!nh)
goto errout_free;
err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
goto errout_free;
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
out:
return err;
errout_free:
kfree_skb(skb);
goto out;
}
static bool nh_dump_filtered(struct nexthop *nh, int dev_idx, int master_idx,
bool group_filter, u8 family)
{
const struct net_device *dev;
const struct nh_info *nhi;
if (group_filter && !nh->is_group)
return true;
if (!dev_idx && !master_idx && !family)
return false;
if (nh->is_group)
return true;
nhi = rtnl_dereference(nh->nh_info);
if (family && nhi->family != family)
return true;
dev = nhi->fib_nhc.nhc_dev;
if (dev_idx && (!dev || dev->ifindex != dev_idx))
return true;
if (master_idx) {
struct net_device *master;
if (!dev)
return true;
master = netdev_master_upper_dev_get((struct net_device *)dev);
if (!master || master->ifindex != master_idx)
return true;
}
return false;
}
static int nh_valid_dump_req(const struct nlmsghdr *nlh, int *dev_idx,
int *master_idx, bool *group_filter,
bool *fdb_filter, struct netlink_callback *cb)
{
struct netlink_ext_ack *extack = cb->extack;
struct nlattr *tb[NHA_MAX + 1];
struct nhmsg *nhm;
int err, i;
u32 idx;
err = nlmsg_parse(nlh, sizeof(*nhm), tb, NHA_MAX, rtm_nh_policy,
NULL);
if (err < 0)
return err;
for (i = 0; i <= NHA_MAX; ++i) {
if (!tb[i])
continue;
switch (i) {
case NHA_OIF:
idx = nla_get_u32(tb[i]);
if (idx > INT_MAX) {
NL_SET_ERR_MSG(extack, "Invalid device index");
return -EINVAL;
}
*dev_idx = idx;
break;
case NHA_MASTER:
idx = nla_get_u32(tb[i]);
if (idx > INT_MAX) {
NL_SET_ERR_MSG(extack, "Invalid master device index");
return -EINVAL;
}
*master_idx = idx;
break;
case NHA_GROUPS:
*group_filter = true;
break;
case NHA_FDB:
*fdb_filter = true;
break;
default:
NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request");
return -EINVAL;
}
}
nhm = nlmsg_data(nlh);
if (nhm->nh_protocol || nhm->resvd || nhm->nh_scope || nhm->nh_flags) {
NL_SET_ERR_MSG(extack, "Invalid values in header for nexthop dump request");
return -EINVAL;
}
return 0;
}
/* rtnl */
static int rtm_dump_nexthop(struct sk_buff *skb, struct netlink_callback *cb)
{
bool group_filter = false, fdb_filter = false;
struct nhmsg *nhm = nlmsg_data(cb->nlh);
int dev_filter_idx = 0, master_idx = 0;
struct net *net = sock_net(skb->sk);
struct rb_root *root = &net->nexthop.rb_root;
struct rb_node *node;
int idx = 0, s_idx;
int err;
err = nh_valid_dump_req(cb->nlh, &dev_filter_idx, &master_idx,
&group_filter, &fdb_filter, cb);
if (err < 0)
return err;
s_idx = cb->args[0];
for (node = rb_first(root); node; node = rb_next(node)) {
struct nexthop *nh;
if (idx < s_idx)
goto cont;
nh = rb_entry(node, struct nexthop, rb_node);
if (nh_dump_filtered(nh, dev_filter_idx, master_idx,
group_filter, nhm->nh_family))
goto cont;
err = nh_fill_node(skb, nh, RTM_NEWNEXTHOP,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI);
if (err < 0) {
if (likely(skb->len))
goto out;
goto out_err;
}
cont:
idx++;
}
out:
err = skb->len;
out_err:
cb->args[0] = idx;
cb->seq = net->nexthop.seq;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
return err;
}
static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu)
{
unsigned int hash = nh_dev_hashfn(dev->ifindex);
struct net *net = dev_net(dev);
struct hlist_head *head = &net->nexthop.devhash[hash];
struct hlist_node *n;
struct nh_info *nhi;
hlist_for_each_entry_safe(nhi, n, head, dev_hash) {
if (nhi->fib_nhc.nhc_dev == dev) {
if (nhi->family == AF_INET)
fib_nhc_update_mtu(&nhi->fib_nhc, dev->mtu,
orig_mtu);
}
}
}
/* rtnl */
static int nh_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct netdev_notifier_info_ext *info_ext;
switch (event) {
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
nexthop_flush_dev(dev);
break;
case NETDEV_CHANGE:
if (!(dev_get_flags(dev) & (IFF_RUNNING | IFF_LOWER_UP)))
nexthop_flush_dev(dev);
break;
case NETDEV_CHANGEMTU:
info_ext = ptr;
nexthop_sync_mtu(dev, info_ext->ext.mtu);
rt_cache_flush(dev_net(dev));
break;
}
return NOTIFY_DONE;
}
static struct notifier_block nh_netdev_notifier = {
.notifier_call = nh_netdev_event,
};
int register_nexthop_notifier(struct net *net, struct notifier_block *nb)
{
return atomic_notifier_chain_register(&net->nexthop.notifier_chain, nb);
}
EXPORT_SYMBOL(register_nexthop_notifier);
int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&net->nexthop.notifier_chain,
nb);
}
EXPORT_SYMBOL(unregister_nexthop_notifier);
static void __net_exit nexthop_net_exit(struct net *net)
{
rtnl_lock();
flush_all_nexthops(net);
rtnl_unlock();
kfree(net->nexthop.devhash);
}
static int __net_init nexthop_net_init(struct net *net)
{
size_t sz = sizeof(struct hlist_head) * NH_DEV_HASHSIZE;
net->nexthop.rb_root = RB_ROOT;
net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
if (!net->nexthop.devhash)
return -ENOMEM;
ATOMIC_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
return 0;
}
static struct pernet_operations nexthop_net_ops = {
.init = nexthop_net_init,
.exit = nexthop_net_exit,
};
static int __init nexthop_init(void)
{
register_pernet_subsys(&nexthop_net_ops);
register_netdevice_notifier(&nh_netdev_notifier);
rtnl_register(PF_UNSPEC, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_DELNEXTHOP, rtm_del_nexthop, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_GETNEXTHOP, rtm_get_nexthop,
rtm_dump_nexthop, 0);
rtnl_register(PF_INET, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
rtnl_register(PF_INET, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0);
rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0);
return 0;
}
subsys_initcall(nexthop_init);