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nexthop: Prepare new notification info

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Prepare the new notification information so that it could be passed to
listeners in the new patch.

Changes since RFC:
* Add a blank line in __nh_notifier_single_info_init()

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2020-11-04 15:30:25 +02:00 committed by Jakub Kicinski
parent 3578d53dce
commit 5ca474f234
1 changed files with 109 additions and 0 deletions
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109
net/ipv4/nexthop.c
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@ -36,15 +36,124 @@ static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
[NHA_FDB] = { .type = NLA_FLAG },
};
static bool nexthop_notifiers_is_empty(struct net *net)
{
return !net->nexthop.notifier_chain.head;
}
static void
__nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info,
const struct nexthop *nh)
{
struct nh_info *nhi = rtnl_dereference(nh->nh_info);
nh_info->dev = nhi->fib_nhc.nhc_dev;
nh_info->gw_family = nhi->fib_nhc.nhc_gw_family;
if (nh_info->gw_family == AF_INET)
nh_info->ipv4 = nhi->fib_nhc.nhc_gw.ipv4;
else if (nh_info->gw_family == AF_INET6)
nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6;
nh_info->is_reject = nhi->reject_nh;
nh_info->is_fdb = nhi->fdb_nh;
nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate;
}
static int nh_notifier_single_info_init(struct nh_notifier_info *info,
const struct nexthop *nh)
{
info->nh = kzalloc(sizeof(*info->nh), GFP_KERNEL);
if (!info->nh)
return -ENOMEM;
__nh_notifier_single_info_init(info->nh, nh);
return 0;
}
static void nh_notifier_single_info_fini(struct nh_notifier_info *info)
{
kfree(info->nh);
}
static int nh_notifier_grp_info_init(struct nh_notifier_info *info,
const struct nexthop *nh)
{
struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
u16 num_nh = nhg->num_nh;
int i;
info->nh_grp = kzalloc(struct_size(info->nh_grp, nh_entries, num_nh),
GFP_KERNEL);
if (!info->nh_grp)
return -ENOMEM;
info->nh_grp->num_nh = num_nh;
info->nh_grp->is_fdb = nhg->fdb_nh;
for (i = 0; i < num_nh; i++) {
struct nh_grp_entry *nhge = &nhg->nh_entries[i];
info->nh_grp->nh_entries[i].id = nhge->nh->id;
info->nh_grp->nh_entries[i].weight = nhge->weight;
__nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh,
nhge->nh);
}
return 0;
}
static void nh_notifier_grp_info_fini(struct nh_notifier_info *info)
{
kfree(info->nh_grp);
}
static int nh_notifier_info_init(struct nh_notifier_info *info,
const struct nexthop *nh)
{
info->id = nh->id;
info->is_grp = nh->is_group;
if (info->is_grp)
return nh_notifier_grp_info_init(info, nh);
else
return nh_notifier_single_info_init(info, nh);
}
static void nh_notifier_info_fini(struct nh_notifier_info *info)
{
if (info->is_grp)
nh_notifier_grp_info_fini(info);
else
nh_notifier_single_info_fini(info);
}
static int call_nexthop_notifiers(struct net *net,
enum nexthop_event_type event_type,
struct nexthop *nh,
struct netlink_ext_ack *extack)
{
struct nh_notifier_info info = {
.net = net,
.extack = extack,
};
int err;
ASSERT_RTNL();
if (nexthop_notifiers_is_empty(net))
return 0;
err = nh_notifier_info_init(&info, nh);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to initialize nexthop notifier info");
return err;
}
err = blocking_notifier_call_chain(&net->nexthop.notifier_chain,
event_type, nh);
nh_notifier_info_fini(&info);
return notifier_to_errno(err);
}