1 files changed, 561 insertions, 0 deletions

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
new file mode 100644
index 000000000..a44101b2f
--- /dev/null
+++ b/net/sched/act_pedit.c
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_pedit.c	Generic packet editor
+ *
+ * Authors:	Jamal Hadi Salim (2002-4)
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_pedit.h>
+#include <uapi/linux/tc_act/tc_pedit.h>
+#include <net/pkt_cls.h>
+
+static unsigned int pedit_net_id;
+static struct tc_action_ops act_pedit_ops;
+
+static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
+	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },
+	[TCA_PEDIT_PARMS_EX]	= { .len = sizeof(struct tc_pedit) },
+	[TCA_PEDIT_KEYS_EX]   = { .type = NLA_NESTED },
+};
+
+static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
+	[TCA_PEDIT_KEY_EX_HTYPE]  = { .type = NLA_U16 },
+	[TCA_PEDIT_KEY_EX_CMD]	  = { .type = NLA_U16 },
+};
+
+static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
+							u8 n)
+{
+	struct tcf_pedit_key_ex *keys_ex;
+	struct tcf_pedit_key_ex *k;
+	const struct nlattr *ka;
+	int err = -EINVAL;
+	int rem;
+
+	if (!nla)
+		return NULL;
+
+	keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
+	if (!keys_ex)
+		return ERR_PTR(-ENOMEM);
+
+	k = keys_ex;
+
+	nla_for_each_nested(ka, nla, rem) {
+		struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
+
+		if (!n) {
+			err = -EINVAL;
+			goto err_out;
+		}
+		n--;
+
+		if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
+			err = -EINVAL;
+			goto err_out;
+		}
+
+		err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
+						  ka, pedit_key_ex_policy,
+						  NULL);
+		if (err)
+			goto err_out;
+
+		if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
+		    !tb[TCA_PEDIT_KEY_EX_CMD]) {
+			err = -EINVAL;
+			goto err_out;
+		}
+
+		k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
+		k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
+
+		if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
+		    k->cmd > TCA_PEDIT_CMD_MAX) {
+			err = -EINVAL;
+			goto err_out;
+		}
+
+		k++;
+	}
+
+	if (n) {
+		err = -EINVAL;
+		goto err_out;
+	}
+
+	return keys_ex;
+
+err_out:
+	kfree(keys_ex);
+	return ERR_PTR(err);
+}
+
+static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
+				 struct tcf_pedit_key_ex *keys_ex, int n)
+{
+	struct nlattr *keys_start = nla_nest_start_noflag(skb,
+							  TCA_PEDIT_KEYS_EX);
+
+	if (!keys_start)
+		goto nla_failure;
+	for (; n > 0; n--) {
+		struct nlattr *key_start;
+
+		key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
+		if (!key_start)
+			goto nla_failure;
+
+		if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
+		    nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
+			goto nla_failure;
+
+		nla_nest_end(skb, key_start);
+
+		keys_ex++;
+	}
+
+	nla_nest_end(skb, keys_start);
+
+	return 0;
+nla_failure:
+	nla_nest_cancel(skb, keys_start);
+	return -EINVAL;
+}
+
+static int tcf_pedit_init(struct net *net, struct nlattr *nla,
+			  struct nlattr *est, struct tc_action **a,
+			  int ovr, int bind, bool rtnl_held,
+			  struct tcf_proto *tp, u32 flags,
+			  struct netlink_ext_ack *extack)
+{
+	struct tc_action_net *tn = net_generic(net, pedit_net_id);
+	struct nlattr *tb[TCA_PEDIT_MAX + 1];
+	struct tcf_chain *goto_ch = NULL;
+	struct tc_pedit_key *keys = NULL;
+	struct tcf_pedit_key_ex *keys_ex;
+	struct tc_pedit *parm;
+	struct nlattr *pattr;
+	struct tcf_pedit *p;
+	int ret = 0, err;
+	int i, ksize;
+	u32 index;
+
+	if (!nla) {
+		NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
+		return -EINVAL;
+	}
+
+	err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
+					  pedit_policy, NULL);
+	if (err < 0)
+		return err;
+
+	pattr = tb[TCA_PEDIT_PARMS];
+	if (!pattr)
+		pattr = tb[TCA_PEDIT_PARMS_EX];
+	if (!pattr) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
+		return -EINVAL;
+	}
+
+	parm = nla_data(pattr);
+	if (!parm->nkeys) {
+		NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
+		return -EINVAL;
+	}
+	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
+	if (nla_len(pattr) < sizeof(*parm) + ksize) {
+		NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
+		return -EINVAL;
+	}
+
+	keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
+	if (IS_ERR(keys_ex))
+		return PTR_ERR(keys_ex);
+
+	index = parm->index;
+	err = tcf_idr_check_alloc(tn, &index, a, bind);
+	if (!err) {
+		ret = tcf_idr_create(tn, index, est, a,
+				     &act_pedit_ops, bind, false, flags);
+		if (ret) {
+			tcf_idr_cleanup(tn, index);
+			goto out_free;
+		}
+		ret = ACT_P_CREATED;
+	} else if (err > 0) {
+		if (bind)
+			goto out_free;
+		if (!ovr) {
+			ret = -EEXIST;
+			goto out_release;
+		}
+	} else {
+		ret = err;
+		goto out_free;
+	}
+
+	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+	if (err < 0) {
+		ret = err;
+		goto out_release;
+	}
+	p = to_pedit(*a);
+	spin_lock_bh(&p->tcf_lock);
+
+	if (ret == ACT_P_CREATED ||
+	    (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
+		keys = kmalloc(ksize, GFP_ATOMIC);
+		if (!keys) {
+			spin_unlock_bh(&p->tcf_lock);
+			ret = -ENOMEM;
+			goto put_chain;
+		}
+		kfree(p->tcfp_keys);
+		p->tcfp_keys = keys;
+		p->tcfp_nkeys = parm->nkeys;
+	}
+	memcpy(p->tcfp_keys, parm->keys, ksize);
+	p->tcfp_off_max_hint = 0;
+	for (i = 0; i < p->tcfp_nkeys; ++i) {
+		u32 cur = p->tcfp_keys[i].off;
+
+		/* sanitize the shift value for any later use */
+		p->tcfp_keys[i].shift = min_t(size_t, BITS_PER_TYPE(int) - 1,
+					      p->tcfp_keys[i].shift);
+
+		/* The AT option can read a single byte, we can bound the actual
+		 * value with uchar max.
+		 */
+		cur += (0xff & p->tcfp_keys[i].offmask) >> p->tcfp_keys[i].shift;
+
+		/* Each key touches 4 bytes starting from the computed offset */
+		p->tcfp_off_max_hint = max(p->tcfp_off_max_hint, cur + 4);
+	}
+
+	p->tcfp_flags = parm->flags;
+	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+
+	kfree(p->tcfp_keys_ex);
+	p->tcfp_keys_ex = keys_ex;
+
+	spin_unlock_bh(&p->tcf_lock);
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+	return ret;
+
+put_chain:
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+out_release:
+	tcf_idr_release(*a, bind);
+out_free:
+	kfree(keys_ex);
+	return ret;
+
+}
+
+static void tcf_pedit_cleanup(struct tc_action *a)
+{
+	struct tcf_pedit *p = to_pedit(a);
+	struct tc_pedit_key *keys = p->tcfp_keys;
+
+	kfree(keys);
+	kfree(p->tcfp_keys_ex);
+}
+
+static bool offset_valid(struct sk_buff *skb, int offset)
+{
+	if (offset > 0 && offset > skb->len)
+		return false;
+
+	if  (offset < 0 && -offset > skb_headroom(skb))
+		return false;
+
+	return true;
+}
+
+static int pedit_skb_hdr_offset(struct sk_buff *skb,
+				enum pedit_header_type htype, int *hoffset)
+{
+	int ret = -EINVAL;
+
+	switch (htype) {
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
+		if (skb_mac_header_was_set(skb)) {
+			*hoffset = skb_mac_offset(skb);
+			ret = 0;
+		}
+		break;
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
+		*hoffset = skb_network_offset(skb);
+		ret = 0;
+		break;
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
+	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
+		if (skb_transport_header_was_set(skb)) {
+			*hoffset = skb_transport_offset(skb);
+			ret = 0;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
+			 struct tcf_result *res)
+{
+	struct tcf_pedit *p = to_pedit(a);
+	u32 max_offset;
+	int i;
+
+	spin_lock(&p->tcf_lock);
+
+	max_offset = (skb_transport_header_was_set(skb) ?
+		      skb_transport_offset(skb) :
+		      skb_network_offset(skb)) +
+		     p->tcfp_off_max_hint;
+	if (skb_ensure_writable(skb, min(skb->len, max_offset)))
+		goto unlock;
+
+	tcf_lastuse_update(&p->tcf_tm);
+
+	if (p->tcfp_nkeys > 0) {
+		struct tc_pedit_key *tkey = p->tcfp_keys;
+		struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
+		enum pedit_header_type htype =
+			TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
+		enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
+
+		for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
+			u32 *ptr, hdata;
+			int offset = tkey->off;
+			int hoffset;
+			u32 val;
+			int rc;
+
+			if (tkey_ex) {
+				htype = tkey_ex->htype;
+				cmd = tkey_ex->cmd;
+
+				tkey_ex++;
+			}
+
+			rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
+			if (rc) {
+				pr_info("tc action pedit bad header type specified (0x%x)\n",
+					htype);
+				goto bad;
+			}
+
+			if (tkey->offmask) {
+				u8 *d, _d;
+
+				if (!offset_valid(skb, hoffset + tkey->at)) {
+					pr_info("tc action pedit 'at' offset %d out of bounds\n",
+						hoffset + tkey->at);
+					goto bad;
+				}
+				d = skb_header_pointer(skb, hoffset + tkey->at,
+						       sizeof(_d), &_d);
+				if (!d)
+					goto bad;
+				offset += (*d & tkey->offmask) >> tkey->shift;
+			}
+
+			if (offset % 4) {
+				pr_info("tc action pedit offset must be on 32 bit boundaries\n");
+				goto bad;
+			}
+
+			if (!offset_valid(skb, hoffset + offset)) {
+				pr_info("tc action pedit offset %d out of bounds\n",
+					hoffset + offset);
+				goto bad;
+			}
+
+			ptr = skb_header_pointer(skb, hoffset + offset,
+						 sizeof(hdata), &hdata);
+			if (!ptr)
+				goto bad;
+			/* just do it, baby */
+			switch (cmd) {
+			case TCA_PEDIT_KEY_EX_CMD_SET:
+				val = tkey->val;
+				break;
+			case TCA_PEDIT_KEY_EX_CMD_ADD:
+				val = (*ptr + tkey->val) & ~tkey->mask;
+				break;
+			default:
+				pr_info("tc action pedit bad command (%d)\n",
+					cmd);
+				goto bad;
+			}
+
+			*ptr = ((*ptr & tkey->mask) ^ val);
+			if (ptr == &hdata)
+				skb_store_bits(skb, hoffset + offset, ptr, 4);
+		}
+
+		goto done;
+	} else {
+		WARN(1, "pedit BUG: index %d\n", p->tcf_index);
+	}
+
+bad:
+	p->tcf_qstats.overlimits++;
+done:
+	bstats_update(&p->tcf_bstats, skb);
+unlock:
+	spin_unlock(&p->tcf_lock);
+	return p->tcf_action;
+}
+
+static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+				   u64 drops, u64 lastuse, bool hw)
+{
+	struct tcf_pedit *d = to_pedit(a);
+	struct tcf_t *tm = &d->tcf_tm;
+
+	tcf_action_update_stats(a, bytes, packets, drops, hw);
+	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
+			  int bind, int ref)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tcf_pedit *p = to_pedit(a);
+	struct tc_pedit *opt;
+	struct tcf_t t;
+	int s;
+
+	s = struct_size(opt, keys, p->tcfp_nkeys);
+
+	/* netlink spinlocks held above us - must use ATOMIC */
+	opt = kzalloc(s, GFP_ATOMIC);
+	if (unlikely(!opt))
+		return -ENOBUFS;
+
+	spin_lock_bh(&p->tcf_lock);
+	memcpy(opt->keys, p->tcfp_keys, flex_array_size(opt, keys, p->tcfp_nkeys));
+	opt->index = p->tcf_index;
+	opt->nkeys = p->tcfp_nkeys;
+	opt->flags = p->tcfp_flags;
+	opt->action = p->tcf_action;
+	opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
+	opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
+
+	if (p->tcfp_keys_ex) {
+		if (tcf_pedit_key_ex_dump(skb,
+					  p->tcfp_keys_ex,
+					  p->tcfp_nkeys))
+			goto nla_put_failure;
+
+		if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
+			goto nla_put_failure;
+	} else {
+		if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
+			goto nla_put_failure;
+	}
+
+	tcf_tm_dump(&t, &p->tcf_tm);
+	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
+		goto nla_put_failure;
+	spin_unlock_bh(&p->tcf_lock);
+
+	kfree(opt);
+	return skb->len;
+
+nla_put_failure:
+	spin_unlock_bh(&p->tcf_lock);
+	nlmsg_trim(skb, b);
+	kfree(opt);
+	return -1;
+}
+
+static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
+			    struct netlink_callback *cb, int type,
+			    const struct tc_action_ops *ops,
+			    struct netlink_ext_ack *extack)
+{
+	struct tc_action_net *tn = net_generic(net, pedit_net_id);
+
+	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
+}
+
+static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
+{
+	struct tc_action_net *tn = net_generic(net, pedit_net_id);
+
+	return tcf_idr_search(tn, a, index);
+}
+
+static struct tc_action_ops act_pedit_ops = {
+	.kind		=	"pedit",
+	.id		=	TCA_ID_PEDIT,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_pedit_act,
+	.stats_update	=	tcf_pedit_stats_update,
+	.dump		=	tcf_pedit_dump,
+	.cleanup	=	tcf_pedit_cleanup,
+	.init		=	tcf_pedit_init,
+	.walk		=	tcf_pedit_walker,
+	.lookup		=	tcf_pedit_search,
+	.size		=	sizeof(struct tcf_pedit),
+};
+
+static __net_init int pedit_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, pedit_net_id);
+
+	return tc_action_net_init(net, tn, &act_pedit_ops);
+}
+
+static void __net_exit pedit_exit_net(struct list_head *net_list)
+{
+	tc_action_net_exit(net_list, pedit_net_id);
+}
+
+static struct pernet_operations pedit_net_ops = {
+	.init = pedit_init_net,
+	.exit_batch = pedit_exit_net,
+	.id   = &pedit_net_id,
+	.size = sizeof(struct tc_action_net),
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Generic Packet Editor actions");
+MODULE_LICENSE("GPL");
+
+static int __init pedit_init_module(void)
+{
+	return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
+}
+
+static void __exit pedit_cleanup_module(void)
+{
+	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
+}
+
+module_init(pedit_init_module);
+module_exit(pedit_cleanup_module);