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Diffstat (limited to 'net/can/gw.c')
-rw-r--r--net/can/gw.c73
1 files changed, 46 insertions, 27 deletions
diff --git a/net/can/gw.c b/net/can/gw.c
index 2d117dc5ebe..050a2110d43 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -146,6 +146,7 @@ struct cgw_job {
/* tbc */
};
u8 gwtype;
+ u8 limit_hops;
u16 flags;
};
@@ -402,6 +403,11 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
/* put the incremented hop counter in the cloned skb */
cgw_hops(nskb) = cgw_hops(skb) + 1;
+
+ /* first processing of this CAN frame -> adjust to private hop limit */
+ if (gwj->limit_hops && cgw_hops(nskb) == 1)
+ cgw_hops(nskb) = max_hops - gwj->limit_hops + 1;
+
nskb->dev = gwj->dst.dev;
/* pointer to modifiable CAN frame */
@@ -445,9 +451,9 @@ static inline void cgw_unregister_filter(struct cgw_job *gwj)
}
static int cgw_notifier(struct notifier_block *nb,
- unsigned long msg, void *data)
+ unsigned long msg, void *ptr)
{
- struct net_device *dev = (struct net_device *)data;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
@@ -466,7 +472,7 @@ static int cgw_notifier(struct notifier_block *nb,
if (gwj->src.dev == dev || gwj->dst.dev == dev) {
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
- kfree(gwj);
+ kmem_cache_free(cgw_cache, gwj);
}
}
}
@@ -509,6 +515,11 @@ static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
/* check non default settings of attributes */
+ if (gwj->limit_hops) {
+ if (nla_put_u8(skb, CGW_LIM_HOPS, gwj->limit_hops) < 0)
+ goto cancel;
+ }
+
if (gwj->mod.modtype.and) {
memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
mb.modtype = gwj->mod.modtype.and;
@@ -606,11 +617,12 @@ static const struct nla_policy cgw_policy[CGW_MAX+1] = {
[CGW_SRC_IF] = { .type = NLA_U32 },
[CGW_DST_IF] = { .type = NLA_U32 },
[CGW_FILTER] = { .len = sizeof(struct can_filter) },
+ [CGW_LIM_HOPS] = { .type = NLA_U8 },
};
/* check for common and gwtype specific attributes */
static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
- u8 gwtype, void *gwtypeattr)
+ u8 gwtype, void *gwtypeattr, u8 *limhops)
{
struct nlattr *tb[CGW_MAX+1];
struct cgw_frame_mod mb;
@@ -625,6 +637,13 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
if (err < 0)
return err;
+ if (tb[CGW_LIM_HOPS]) {
+ *limhops = nla_get_u8(tb[CGW_LIM_HOPS]);
+
+ if (*limhops < 1 || *limhops > max_hops)
+ return -EINVAL;
+ }
+
/* check for AND/OR/XOR/SET modifications */
if (tb[CGW_MOD_AND]) {
@@ -778,14 +797,14 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
return 0;
}
-static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
- void *arg)
+static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct rtcanmsg *r;
struct cgw_job *gwj;
+ u8 limhops = 0;
int err = 0;
- if (!capable(CAP_NET_ADMIN))
+ if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (nlmsg_len(nlh) < sizeof(*r))
@@ -809,7 +828,8 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
gwj->flags = r->flags;
gwj->gwtype = r->gwtype;
- err = cgw_parse_attr(nlh, &gwj->mod, CGW_TYPE_CAN_CAN, &gwj->ccgw);
+ err = cgw_parse_attr(nlh, &gwj->mod, CGW_TYPE_CAN_CAN, &gwj->ccgw,
+ &limhops);
if (err < 0)
goto out;
@@ -819,34 +839,29 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
if (!gwj->ccgw.src_idx || !gwj->ccgw.dst_idx)
goto out;
- gwj->src.dev = dev_get_by_index(&init_net, gwj->ccgw.src_idx);
+ gwj->src.dev = __dev_get_by_index(&init_net, gwj->ccgw.src_idx);
if (!gwj->src.dev)
goto out;
- /* check for CAN netdev not using header_ops - see gw_rcv() */
- if (gwj->src.dev->type != ARPHRD_CAN || gwj->src.dev->header_ops)
- goto put_src_out;
+ if (gwj->src.dev->type != ARPHRD_CAN)
+ goto out;
- gwj->dst.dev = dev_get_by_index(&init_net, gwj->ccgw.dst_idx);
+ gwj->dst.dev = __dev_get_by_index(&init_net, gwj->ccgw.dst_idx);
if (!gwj->dst.dev)
- goto put_src_out;
+ goto out;
+
+ if (gwj->dst.dev->type != ARPHRD_CAN)
+ goto out;
- /* check for CAN netdev not using header_ops - see gw_rcv() */
- if (gwj->dst.dev->type != ARPHRD_CAN || gwj->dst.dev->header_ops)
- goto put_src_dst_out;
+ gwj->limit_hops = limhops;
ASSERT_RTNL();
err = cgw_register_filter(gwj);
if (!err)
hlist_add_head_rcu(&gwj->list, &cgw_list);
-
-put_src_dst_out:
- dev_put(gwj->dst.dev);
-put_src_out:
- dev_put(gwj->src.dev);
out:
if (err)
kmem_cache_free(cgw_cache, gwj);
@@ -864,20 +879,21 @@ static void cgw_remove_all_jobs(void)
hlist_for_each_entry_safe(gwj, nx, &cgw_list, list) {
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
- kfree(gwj);
+ kmem_cache_free(cgw_cache, gwj);
}
}
-static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct cgw_job *gwj = NULL;
struct hlist_node *nx;
struct rtcanmsg *r;
struct cf_mod mod;
struct can_can_gw ccgw;
+ u8 limhops = 0;
int err = 0;
- if (!capable(CAP_NET_ADMIN))
+ if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (nlmsg_len(nlh) < sizeof(*r))
@@ -891,7 +907,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
if (r->gwtype != CGW_TYPE_CAN_CAN)
return -EINVAL;
- err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw);
+ err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
if (err < 0)
return err;
@@ -911,6 +927,9 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
if (gwj->flags != r->flags)
continue;
+ if (gwj->limit_hops != limhops)
+ continue;
+
if (memcmp(&gwj->mod, &mod, sizeof(mod)))
continue;
@@ -920,7 +939,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
hlist_del(&gwj->list);
cgw_unregister_filter(gwj);
- kfree(gwj);
+ kmem_cache_free(cgw_cache, gwj);
err = 0;
break;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 07:38:34 +0000