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-rw-r--r--net/sched/act_api.c93
1 files changed, 61 insertions, 32 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 662574646256..8e77ddd9f0ad 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -617,31 +617,40 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
int err;
if (name == NULL) {
- err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
+ err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
kind = tb[TCA_ACT_KIND];
- if (!kind)
+ if (!kind) {
+ NL_SET_ERR_MSG(extack, "TC action kind must be specified");
goto err_out;
- if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
+ }
+ if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
+ NL_SET_ERR_MSG(extack, "TC action name too long");
goto err_out;
+ }
if (tb[TCA_ACT_COOKIE]) {
int cklen = nla_len(tb[TCA_ACT_COOKIE]);
- if (cklen > TC_COOKIE_MAX_SIZE)
+ if (cklen > TC_COOKIE_MAX_SIZE) {
+ NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
goto err_out;
+ }
cookie = nla_memdup_cookie(tb);
if (!cookie) {
+ NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
err = -ENOMEM;
goto err_out;
}
}
} else {
- err = -EINVAL;
- if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
+ if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
+ NL_SET_ERR_MSG(extack, "TC action name too long");
+ err = -EINVAL;
goto err_out;
+ }
}
a_o = tc_lookup_action_n(act_name);
@@ -664,6 +673,7 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
goto err_mod;
}
#endif
+ NL_SET_ERR_MSG(extack, "Failed to load TC action module");
err = -ENOENT;
goto err_out;
}
@@ -698,6 +708,7 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
list_add_tail(&a->list, &actions);
tcf_action_destroy(&actions, bind);
+ NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
return ERR_PTR(err);
}
}
@@ -734,7 +745,7 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
int err;
int i;
- err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
+ err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
if (err < 0)
return err;
@@ -842,7 +853,8 @@ out_nlmsg_trim:
static int
tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
- struct list_head *actions, int event)
+ struct list_head *actions, int event,
+ struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
@@ -851,6 +863,7 @@ tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
return -ENOBUFS;
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
0, 0) <= 0) {
+ NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
kfree_skb(skb);
return -EINVAL;
}
@@ -859,7 +872,8 @@ tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
}
static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
- struct nlmsghdr *n, u32 portid)
+ struct nlmsghdr *n, u32 portid,
+ struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_ACT_MAX + 1];
const struct tc_action_ops *ops;
@@ -867,20 +881,24 @@ static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
int index;
int err;
- err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
+ err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
if (tb[TCA_ACT_INDEX] == NULL ||
- nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
+ nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
+ NL_SET_ERR_MSG(extack, "Invalid TC action index value");
goto err_out;
+ }
index = nla_get_u32(tb[TCA_ACT_INDEX]);
err = -EINVAL;
ops = tc_lookup_action(tb[TCA_ACT_KIND]);
- if (!ops) /* could happen in batch of actions */
+ if (!ops) { /* could happen in batch of actions */
+ NL_SET_ERR_MSG(extack, "Specified TC action not found");
goto err_out;
+ }
err = -ENOENT;
if (ops->lookup(net, &a, index) == 0)
goto err_mod;
@@ -895,7 +913,8 @@ err_out:
}
static int tca_action_flush(struct net *net, struct nlattr *nla,
- struct nlmsghdr *n, u32 portid)
+ struct nlmsghdr *n, u32 portid,
+ struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
unsigned char *b;
@@ -909,35 +928,39 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
int err = -ENOMEM;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
- if (!skb) {
- pr_debug("tca_action_flush: failed skb alloc\n");
+ if (!skb)
return err;
- }
b = skb_tail_pointer(skb);
- err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
+ err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
kind = tb[TCA_ACT_KIND];
ops = tc_lookup_action(kind);
- if (!ops) /*some idjot trying to flush unknown action */
+ if (!ops) { /*some idjot trying to flush unknown action */
+ NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
goto err_out;
+ }
nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
sizeof(*t), 0);
- if (!nlh)
+ if (!nlh) {
+ NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
goto out_module_put;
+ }
t = nlmsg_data(nlh);
t->tca_family = AF_UNSPEC;
t->tca__pad1 = 0;
t->tca__pad2 = 0;
nest = nla_nest_start(skb, TCA_ACT_TAB);
- if (!nest)
+ if (!nest) {
+ NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
goto out_module_put;
+ }
err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
if (err <= 0) {
@@ -954,6 +977,8 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
n->nlmsg_flags & NLM_F_ECHO);
if (err > 0)
return 0;
+ if (err < 0)
+ NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
return err;
@@ -966,7 +991,7 @@ err_out:
static int
tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
- u32 portid)
+ u32 portid, struct netlink_ext_ack *extack)
{
int ret;
struct sk_buff *skb;
@@ -977,6 +1002,7 @@ tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
0, 1) <= 0) {
+ NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
kfree_skb(skb);
return -EINVAL;
}
@@ -984,6 +1010,7 @@ tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
/* now do the delete */
ret = tcf_action_destroy(actions, 0);
if (ret < 0) {
+ NL_SET_ERR_MSG(extack, "Failed to delete TC action");
kfree_skb(skb);
return ret;
}
@@ -997,26 +1024,27 @@ tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
static int
tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
- u32 portid, int event)
+ u32 portid, int event, struct netlink_ext_ack *extack)
{
int i, ret;
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
struct tc_action *act;
LIST_HEAD(actions);
- ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
+ ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
if (ret < 0)
return ret;
if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
if (tb[1])
- return tca_action_flush(net, tb[1], n, portid);
+ return tca_action_flush(net, tb[1], n, portid, extack);
+ NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
return -EINVAL;
}
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
- act = tcf_action_get_1(net, tb[i], n, portid);
+ act = tcf_action_get_1(net, tb[i], n, portid, extack);
if (IS_ERR(act)) {
ret = PTR_ERR(act);
goto err;
@@ -1026,9 +1054,9 @@ tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
}
if (event == RTM_GETACTION)
- ret = tcf_get_notify(net, portid, n, &actions, event);
+ ret = tcf_get_notify(net, portid, n, &actions, event, extack);
else { /* delete */
- ret = tcf_del_notify(net, n, &actions, portid);
+ ret = tcf_del_notify(net, n, &actions, portid, extack);
if (ret)
goto err;
return ret;
@@ -1041,7 +1069,7 @@ err:
static int
tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
- u32 portid)
+ u32 portid, struct netlink_ext_ack *extack)
{
struct sk_buff *skb;
int err = 0;
@@ -1052,6 +1080,7 @@ tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
RTM_NEWACTION, 0, 0) <= 0) {
+ NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while deleting TC action");
kfree_skb(skb);
return -EINVAL;
}
@@ -1075,7 +1104,7 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
if (ret)
return ret;
- return tcf_add_notify(net, n, &actions, portid);
+ return tcf_add_notify(net, n, &actions, portid, extack);
}
static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
@@ -1103,7 +1132,7 @@ static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
return ret;
if (tca[TCA_ACT_TAB] == NULL) {
- pr_notice("tc_ctl_action: received NO action attribs\n");
+ NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
return -EINVAL;
}
@@ -1126,11 +1155,11 @@ replay:
break;
case RTM_DELACTION:
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
- portid, RTM_DELACTION);
+ portid, RTM_DELACTION, extack);
break;
case RTM_GETACTION:
ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
- portid, RTM_GETACTION);
+ portid, RTM_GETACTION, extack);
break;
default:
BUG();
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.