diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 01b2b17c645a..8f0fee2df3a6 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -3745,6 +3745,63 @@ union bpf_attr {
  * 	Return
  * 		The helper returns **TC_ACT_REDIRECT** on success or
  * 		**TC_ACT_SHOT** on error.
+ *
+ * int bpf_check_mtu(void *ctx, u32 ifindex, u32 *mtu_result, s32 len_diff, u64 flags)
+ *	Description
+ *		Check ctx packet size against MTU of net device (based on
+ *		*ifindex*).  This helper will likely be used in combination with
+ *		helpers that adjust/change the packet size.  The argument
+ *		*len_diff* can be used for querying with a planned size
+ *		change. This allows to check MTU prior to changing packet ctx.
+ *
+ *		Specifying *ifindex* zero means the MTU check is performed
+ *		against the current net device.  This is practical if this isn't
+ *		used prior to redirect.
+ *
+ *		The Linux kernel route table can configure MTUs on a more
+ *		specific per route level, which is not provided by this helper.
+ *		For route level MTU checks use the **bpf_fib_lookup**\ ()
+ *		helper.
+ *
+ *		*ctx* is either **struct xdp_md** for XDP programs or
+ *		**struct sk_buff** for tc cls_act programs.
+ *
+ *		The *flags* argument can be a combination of one or more of the
+ *		following values:
+ *
+ *              **BPF_MTU_CHK_RELAX**
+ *			This flag relax or increase the MTU with room for one
+ *			VLAN header (4 bytes). This relaxation is also used by
+ *			the kernels own forwarding MTU checks.
+ *
+ *		**BPF_MTU_CHK_SEGS**
+ *			This flag will only works for *ctx* **struct sk_buff**.
+ *			If packet context contains extra packet segment buffers
+ *			(often knows as GSO skb), then MTU check is partly
+ *			skipped, because in transmit path it is possible for the
+ *			skb packet to get re-segmented (depending on net device
+ *			features).  This could still be a MTU violation, so this
+ *			flag enables performing MTU check against segments, with
+ *			a different violation return code to tell it apart.
+ *
+ *		The *mtu_result* pointer contains the MTU value of the net
+ *		device including the L2 header size (usually 14 bytes Ethernet
+ *		header). The net device configured MTU is the L3 size, but as
+ *		XDP and TX length operate at L2 this helper include L2 header
+ *		size in reported MTU.
+ *
+ *	Return
+ *		* 0 on success, and populate MTU value in *mtu_result* pointer.
+ *
+ *		* < 0 if any input argument is invalid (*mtu_result* not updated)
+ *
+ *		MTU violations return positive values, but also populate MTU
+ *		value in *mtu_result* pointer, as this can be needed for
+ *		implementing PMTU handing:
+ *
+ *		* **BPF_MTU_CHK_RET_FRAG_NEEDED**
+ *		* **BPF_MTU_CHK_RET_SEGS_TOOBIG**
+ *
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -3903,6 +3960,7 @@ union bpf_attr {
 	FN(bpf_per_cpu_ptr),            \
 	FN(bpf_this_cpu_ptr),		\
 	FN(redirect_peer),		\
+	FN(check_mtu),			\
 	/* */
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
@@ -4927,6 +4985,18 @@ struct bpf_redir_neigh {
 	};
 };
 
+/* bpf_check_mtu flags*/
+enum  bpf_check_mtu_flags {
+	BPF_MTU_CHK_RELAX = (1U << 0),
+	BPF_MTU_CHK_SEGS  = (1U << 1),
+};
+
+enum bpf_check_mtu_ret {
+	BPF_MTU_CHK_RET_SUCCESS,      /* check and lookup successful */
+	BPF_MTU_CHK_RET_FRAG_NEEDED,  /* fragmentation required to fwd */
+	BPF_MTU_CHK_RET_SEGS_TOOBIG,  /* GSO re-segmentation needed to fwd */
+};
+
 enum bpf_task_fd_type {
 	BPF_FD_TYPE_RAW_TRACEPOINT,	/* tp name */
 	BPF_FD_TYPE_TRACEPOINT,		/* tp name */
diff --git a/net/core/filter.c b/net/core/filter.c
index edb543c477b6..bd4a416bd9ad 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5594,6 +5594,122 @@ static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
 	.arg4_type	= ARG_ANYTHING,
 };
 
+static int __bpf_lookup_mtu(struct net_device *dev_curr, u32 ifindex, u64 flags)
+{
+	struct net *netns = dev_net(dev_curr);
+	struct net_device *dev;
+	int mtu;
+
+	/* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */
+	if (ifindex == 0)
+		dev = dev_curr;
+	else
+		dev = dev_get_by_index_rcu(netns, ifindex);
+
+	if (!dev)
+		return -ENODEV;
+
+	/* XDP+TC len is L2: Add L2-header as dev MTU is L3 size */
+	mtu = dev->mtu + dev->hard_header_len;
+
+	/*  Same relax as xdp_ok_fwd_dev() and is_skb_forwardable() */
+	if (flags & BPF_MTU_CHK_RELAX)
+		mtu += VLAN_HLEN;
+
+	return mtu;
+}
+
+BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb,
+	   u32, ifindex, u32 *, mtu_result, s32, len_diff, u64, flags)
+{
+	int ret = BPF_MTU_CHK_RET_FRAG_NEEDED;
+	struct net_device *dev = skb->dev;
+	int len = skb->len;
+	int mtu;
+
+	if (flags & ~(BPF_MTU_CHK_RELAX | BPF_MTU_CHK_SEGS))
+		return -EINVAL;
+
+	mtu = __bpf_lookup_mtu(dev, ifindex, flags);
+	if (unlikely(mtu < 0))
+		return mtu; /* errno */
+
+	len += len_diff; /* len_diff can be negative, minus result pass check */
+	if (len <= mtu) {
+		ret = BPF_MTU_CHK_RET_SUCCESS;
+		goto out;
+	}
+	/* At this point, skb->len exceed MTU, but as it include length of all
+	 * segments, and SKB can get re-segmented in transmit path (see
+	 * validate_xmit_skb), we cannot reject MTU-check for GSO packets.
+	 */
+	if (skb_is_gso(skb)) {
+		ret = BPF_MTU_CHK_RET_SUCCESS;
+
+		/* SKB could get dropped later due to segs > MTU or lacking
+		 * features, thus allow BPF-prog to validate segs length here.
+		 */
+		if (flags & BPF_MTU_CHK_SEGS &&
+		    skb_gso_validate_network_len(skb, mtu)) {
+			ret = BPF_MTU_CHK_RET_SEGS_TOOBIG;
+			goto out;
+		}
+	}
+out:
+	if (mtu_result)
+		*mtu_result = mtu;
+
+	return ret;
+}
+
+BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp,
+	   u32, ifindex, u32 *, mtu_result, s32, len_diff, u64, flags)
+{
+	struct net_device *dev = xdp->rxq->dev;
+	int len = xdp->data_end - xdp->data;
+	int ret = BPF_MTU_CHK_RET_SUCCESS;
+	int mtu;
+
+	/* XDP variant doesn't support multi-buffer segment check (yet) */
+	if (flags & ~BPF_MTU_CHK_RELAX)
+		return -EINVAL;
+
+	mtu = __bpf_lookup_mtu(dev, ifindex, flags);
+	if (unlikely(mtu < 0))
+		return mtu; /* errno */
+
+	len += len_diff; /* len_diff can be negative, minus result pass check */
+	if (len > mtu)
+		ret = BPF_MTU_CHK_RET_FRAG_NEEDED;
+
+	if (mtu_result)
+		*mtu_result = mtu;
+
+	return ret;
+}
+
+static const struct bpf_func_proto bpf_skb_check_mtu_proto = {
+	.func		= bpf_skb_check_mtu,
+	.gpl_only	= true,
+	.ret_type	= RET_INTEGER,
+	.arg1_type      = ARG_PTR_TO_CTX,
+	.arg2_type      = ARG_ANYTHING,
+	.arg3_type      = ARG_PTR_TO_MEM,
+	.arg4_type      = ARG_ANYTHING,
+	.arg5_type      = ARG_ANYTHING,
+};
+
+static const struct bpf_func_proto bpf_xdp_check_mtu_proto = {
+	.func		= bpf_xdp_check_mtu,
+	.gpl_only	= true,
+	.ret_type	= RET_INTEGER,
+	.arg1_type      = ARG_PTR_TO_CTX,
+	.arg2_type      = ARG_ANYTHING,
+	.arg3_type      = ARG_PTR_TO_MEM,
+	.arg4_type      = ARG_ANYTHING,
+	.arg5_type      = ARG_ANYTHING,
+};
+
 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
 {
@@ -7159,6 +7275,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_socket_uid_proto;
 	case BPF_FUNC_fib_lookup:
 		return &bpf_skb_fib_lookup_proto;
+	case BPF_FUNC_check_mtu:
+		return &bpf_skb_check_mtu_proto;
 	case BPF_FUNC_sk_fullsock:
 		return &bpf_sk_fullsock_proto;
 	case BPF_FUNC_sk_storage_get:
@@ -7228,6 +7346,8 @@ xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_xdp_adjust_tail_proto;
 	case BPF_FUNC_fib_lookup:
 		return &bpf_xdp_fib_lookup_proto;
+	case BPF_FUNC_check_mtu:
+		return &bpf_xdp_check_mtu_proto;
 #ifdef CONFIG_INET
 	case BPF_FUNC_sk_lookup_udp:
 		return &bpf_xdp_sk_lookup_udp_proto;
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 01b2b17c645a..8f0fee2df3a6 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -3745,6 +3745,63 @@ union bpf_attr {
  * 	Return
  * 		The helper returns **TC_ACT_REDIRECT** on success or
  * 		**TC_ACT_SHOT** on error.
+ *
+ * int bpf_check_mtu(void *ctx, u32 ifindex, u32 *mtu_result, s32 len_diff, u64 flags)
+ *	Description
+ *		Check ctx packet size against MTU of net device (based on
+ *		*ifindex*).  This helper will likely be used in combination with
+ *		helpers that adjust/change the packet size.  The argument
+ *		*len_diff* can be used for querying with a planned size
+ *		change. This allows to check MTU prior to changing packet ctx.
+ *
+ *		Specifying *ifindex* zero means the MTU check is performed
+ *		against the current net device.  This is practical if this isn't
+ *		used prior to redirect.
+ *
+ *		The Linux kernel route table can configure MTUs on a more
+ *		specific per route level, which is not provided by this helper.
+ *		For route level MTU checks use the **bpf_fib_lookup**\ ()
+ *		helper.
+ *
+ *		*ctx* is either **struct xdp_md** for XDP programs or
+ *		**struct sk_buff** for tc cls_act programs.
+ *
+ *		The *flags* argument can be a combination of one or more of the
+ *		following values:
+ *
+ *              **BPF_MTU_CHK_RELAX**
+ *			This flag relax or increase the MTU with room for one
+ *			VLAN header (4 bytes). This relaxation is also used by
+ *			the kernels own forwarding MTU checks.
+ *
+ *		**BPF_MTU_CHK_SEGS**
+ *			This flag will only works for *ctx* **struct sk_buff**.
+ *			If packet context contains extra packet segment buffers
+ *			(often knows as GSO skb), then MTU check is partly
+ *			skipped, because in transmit path it is possible for the
+ *			skb packet to get re-segmented (depending on net device
+ *			features).  This could still be a MTU violation, so this
+ *			flag enables performing MTU check against segments, with
+ *			a different violation return code to tell it apart.
+ *
+ *		The *mtu_result* pointer contains the MTU value of the net
+ *		device including the L2 header size (usually 14 bytes Ethernet
+ *		header). The net device configured MTU is the L3 size, but as
+ *		XDP and TX length operate at L2 this helper include L2 header
+ *		size in reported MTU.
+ *
+ *	Return
+ *		* 0 on success, and populate MTU value in *mtu_result* pointer.
+ *
+ *		* < 0 if any input argument is invalid (*mtu_result* not updated)
+ *
+ *		MTU violations return positive values, but also populate MTU
+ *		value in *mtu_result* pointer, as this can be needed for
+ *		implementing PMTU handing:
+ *
+ *		* **BPF_MTU_CHK_RET_FRAG_NEEDED**
+ *		* **BPF_MTU_CHK_RET_SEGS_TOOBIG**
+ *
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -3903,6 +3960,7 @@ union bpf_attr {
 	FN(bpf_per_cpu_ptr),            \
 	FN(bpf_this_cpu_ptr),		\
 	FN(redirect_peer),		\
+	FN(check_mtu),			\
 	/* */
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
@@ -4927,6 +4985,18 @@ struct bpf_redir_neigh {
 	};
 };
 
+/* bpf_check_mtu flags*/
+enum  bpf_check_mtu_flags {
+	BPF_MTU_CHK_RELAX = (1U << 0),
+	BPF_MTU_CHK_SEGS  = (1U << 1),
+};
+
+enum bpf_check_mtu_ret {
+	BPF_MTU_CHK_RET_SUCCESS,      /* check and lookup successful */
+	BPF_MTU_CHK_RET_FRAG_NEEDED,  /* fragmentation required to fwd */
+	BPF_MTU_CHK_RET_SEGS_TOOBIG,  /* GSO re-segmentation needed to fwd */
+};
+
 enum bpf_task_fd_type {
 	BPF_FD_TYPE_RAW_TRACEPOINT,	/* tp name */
 	BPF_FD_TYPE_TRACEPOINT,		/* tp name */
