[thirdparty/linux.git] / include / linux / virtio_net.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_VIRTIO_NET_H
#define _LINUX_VIRTIO_NET_H

#include <linux/if_vlan.h>
#include <uapi/linux/tcp.h>
#include <uapi/linux/udp.h>
#include <uapi/linux/virtio_net.h>

static inline int virtio_net_hdr_set_proto(struct sk_buff *skb,
					   const struct virtio_net_hdr *hdr)
{
	switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
	case VIRTIO_NET_HDR_GSO_TCPV4:
	case VIRTIO_NET_HDR_GSO_UDP:
		skb->protocol = cpu_to_be16(ETH_P_IP);
		break;
	case VIRTIO_NET_HDR_GSO_TCPV6:
		skb->protocol = cpu_to_be16(ETH_P_IPV6);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
					const struct virtio_net_hdr *hdr,
					bool little_endian)
{
	unsigned int gso_type = 0;
	unsigned int thlen = 0;
	unsigned int ip_proto;

	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
		case VIRTIO_NET_HDR_GSO_TCPV4:
			gso_type = SKB_GSO_TCPV4;
			ip_proto = IPPROTO_TCP;
			thlen = sizeof(struct tcphdr);
			break;
		case VIRTIO_NET_HDR_GSO_TCPV6:
			gso_type = SKB_GSO_TCPV6;
			ip_proto = IPPROTO_TCP;
			thlen = sizeof(struct tcphdr);
			break;
		case VIRTIO_NET_HDR_GSO_UDP:
			gso_type = SKB_GSO_UDP;
			ip_proto = IPPROTO_UDP;
			thlen = sizeof(struct udphdr);
			break;
		default:
			return -EINVAL;
		}

		if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
			gso_type |= SKB_GSO_TCP_ECN;

		if (hdr->gso_size == 0)
			return -EINVAL;
	}

	if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
		u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
		u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);

		if (!skb_partial_csum_set(skb, start, off))
			return -EINVAL;

		if (skb_transport_offset(skb) + thlen > skb_headlen(skb))
			return -EINVAL;
	} else {
		/* gso packets without NEEDS_CSUM do not set transport_offset.
		 * probe and drop if does not match one of the above types.
		 */
		if (gso_type && skb->network_header) {
			struct flow_keys_basic keys;

			if (!skb->protocol)
				virtio_net_hdr_set_proto(skb, hdr);
retry:
			if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
							      NULL, 0, 0, 0,
							      0)) {
				/* UFO does not specify ipv4 or 6: try both */
				if (gso_type & SKB_GSO_UDP &&
				    skb->protocol == htons(ETH_P_IP)) {
					skb->protocol = htons(ETH_P_IPV6);
					goto retry;
				}
				return -EINVAL;
			}

			if (keys.control.thoff + thlen > skb_headlen(skb) ||
			    keys.basic.ip_proto != ip_proto)
				return -EINVAL;

			skb_set_transport_header(skb, keys.control.thoff);
		}
	}

	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
		u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);

		skb_shinfo(skb)->gso_size = gso_size;
		skb_shinfo(skb)->gso_type = gso_type;

		/* Header must be checked, and gso_segs computed. */
		skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
		skb_shinfo(skb)->gso_segs = 0;
	}

	return 0;
}

static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
					  struct virtio_net_hdr *hdr,
					  bool little_endian,
					  bool has_data_valid,
					  int vlan_hlen)
{
	memset(hdr, 0, sizeof(*hdr));   /* no info leak */

	if (skb_is_gso(skb)) {
		struct skb_shared_info *sinfo = skb_shinfo(skb);

		/* This is a hint as to how much should be linear. */
		hdr->hdr_len = __cpu_to_virtio16(little_endian,
						 skb_headlen(skb));
		hdr->gso_size = __cpu_to_virtio16(little_endian,
						  sinfo->gso_size);
		if (sinfo->gso_type & SKB_GSO_TCPV4)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
		else if (sinfo->gso_type & SKB_GSO_TCPV6)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
		else
			return -EINVAL;
		if (sinfo->gso_type & SKB_GSO_TCP_ECN)
			hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
	} else
		hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;

	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
		hdr->csum_start = __cpu_to_virtio16(little_endian,
			skb_checksum_start_offset(skb) + vlan_hlen);
		hdr->csum_offset = __cpu_to_virtio16(little_endian,
				skb->csum_offset);
	} else if (has_data_valid &&
		   skb->ip_summed == CHECKSUM_UNNECESSARY) {
		hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
	} /* else everything is zero */

	return 0;
}

#endif /* _LINUX_VIRTIO_NET_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
fd2a0437 MR	2	#ifndef _LINUX_VIRTIO_NET_H
	3	#define _LINUX_VIRTIO_NET_H
	4
	5	#include <linux/if_vlan.h>
9274124f WB	6	#include <uapi/linux/tcp.h>
9274124f WB	7	#include <uapi/linux/udp.h>
fd2a0437 MR	8	#include <uapi/linux/virtio_net.h>
fd2a0437 MR	9
9d2f67e4 JT	10	static inline int virtio_net_hdr_set_proto(struct sk_buff *skb,
	11	const struct virtio_net_hdr *hdr)
	12	{
	13	switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
	14	case VIRTIO_NET_HDR_GSO_TCPV4:
	15	case VIRTIO_NET_HDR_GSO_UDP:
	16	skb->protocol = cpu_to_be16(ETH_P_IP);
	17	break;
	18	case VIRTIO_NET_HDR_GSO_TCPV6:
	19	skb->protocol = cpu_to_be16(ETH_P_IPV6);
	20	break;
	21	default:
	22	return -EINVAL;
	23	}
	24
	25	return 0;
	26	}
	27
fd2a0437 MR	28	static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
	29	const struct virtio_net_hdr *hdr,
	30	bool little_endian)
	31	{
0c19f846	32	unsigned int gso_type = 0;
9274124f WB	33	unsigned int thlen = 0;
9274124f WB	34	unsigned int ip_proto;
fd2a0437 MR	35
	36	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
	37	switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
	38	case VIRTIO_NET_HDR_GSO_TCPV4:
	39	gso_type = SKB_GSO_TCPV4;
9274124f WB	40	ip_proto = IPPROTO_TCP;
9274124f WB	41	thlen = sizeof(struct tcphdr);
fd2a0437 MR	42	break;
	43	case VIRTIO_NET_HDR_GSO_TCPV6:
	44	gso_type = SKB_GSO_TCPV6;
9274124f WB	45	ip_proto = IPPROTO_TCP;
9274124f WB	46	thlen = sizeof(struct tcphdr);
fd2a0437	47	break;
0c19f846 WB	48	case VIRTIO_NET_HDR_GSO_UDP:
0c19f846 WB	49	gso_type = SKB_GSO_UDP;
9274124f WB	50	ip_proto = IPPROTO_UDP;
9274124f WB	51	thlen = sizeof(struct udphdr);
0c19f846	52	break;
fd2a0437 MR	53	default:
	54	return -EINVAL;
	55	}
	56
	57	if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
	58	gso_type \|= SKB_GSO_TCP_ECN;
	59
	60	if (hdr->gso_size == 0)
	61	return -EINVAL;
	62	}
	63
	64	if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
	65	u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
	66	u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
	67
	68	if (!skb_partial_csum_set(skb, start, off))
	69	return -EINVAL;
9274124f WB	70
	71	if (skb_transport_offset(skb) + thlen > skb_headlen(skb))
	72	return -EINVAL;
d5be7f63 WB	73	} else {
	74	/* gso packets without NEEDS_CSUM do not set transport_offset.
	75	* probe and drop if does not match one of the above types.
	76	*/
9e8db591	77	if (gso_type && skb->network_header) {
9274124f WB	78	struct flow_keys_basic keys;
9274124f WB	79
9e8db591 WB	80	if (!skb->protocol)
	81	virtio_net_hdr_set_proto(skb, hdr);
	82	retry:
9274124f WB	83	if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
	84	NULL, 0, 0, 0,
	85	0)) {
9e8db591 WB	86	/* UFO does not specify ipv4 or 6: try both */
	87	if (gso_type & SKB_GSO_UDP &&
	88	skb->protocol == htons(ETH_P_IP)) {
	89	skb->protocol = htons(ETH_P_IPV6);
	90	goto retry;
	91	}
d5be7f63	92	return -EINVAL;
9e8db591	93	}
9274124f WB	94
	95	if (keys.control.thoff + thlen > skb_headlen(skb) \|\|
	96	keys.basic.ip_proto != ip_proto)
	97	return -EINVAL;
	98
	99	skb_set_transport_header(skb, keys.control.thoff);
d5be7f63	100	}
fd2a0437 MR	101	}
	102
	103	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
	104	u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
	105
	106	skb_shinfo(skb)->gso_size = gso_size;
	107	skb_shinfo(skb)->gso_type = gso_type;
	108
	109	/* Header must be checked, and gso_segs computed. */
	110	skb_shinfo(skb)->gso_type \|= SKB_GSO_DODGY;
	111	skb_shinfo(skb)->gso_segs = 0;
	112	}
	113
	114	return 0;
	115	}
	116
	117	static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
	118	struct virtio_net_hdr *hdr,
6391a448	119	bool little_endian,
fd3a8862 WB	120	bool has_data_valid,
fd3a8862 WB	121	int vlan_hlen)
fd2a0437	122	{
9403cd7c	123	memset(hdr, 0, sizeof(hdr)); / no info leak */
fd2a0437 MR	124
	125	if (skb_is_gso(skb)) {
	126	struct skb_shared_info *sinfo = skb_shinfo(skb);
	127
	128	/* This is a hint as to how much should be linear. */
	129	hdr->hdr_len = __cpu_to_virtio16(little_endian,
	130	skb_headlen(skb));
	131	hdr->gso_size = __cpu_to_virtio16(little_endian,
	132	sinfo->gso_size);
	133	if (sinfo->gso_type & SKB_GSO_TCPV4)
	134	hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
	135	else if (sinfo->gso_type & SKB_GSO_TCPV6)
	136	hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
fd2a0437 MR	137	else
	138	return -EINVAL;
	139	if (sinfo->gso_type & SKB_GSO_TCP_ECN)
	140	hdr->gso_type \|= VIRTIO_NET_HDR_GSO_ECN;
	141	} else
	142	hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
	143
	144	if (skb->ip_summed == CHECKSUM_PARTIAL) {
	145	hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
fd3a8862 WB	146	hdr->csum_start = __cpu_to_virtio16(little_endian,
fd3a8862 WB	147	skb_checksum_start_offset(skb) + vlan_hlen);
fd2a0437 MR	148	hdr->csum_offset = __cpu_to_virtio16(little_endian,
fd2a0437 MR	149	skb->csum_offset);
6391a448 JW	150	} else if (has_data_valid &&
	151	skb->ip_summed == CHECKSUM_UNNECESSARY) {
	152	hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
fd2a0437 MR	153	} /* else everything is zero */
	154
	155	return 0;
	156	}
	157
d66016a7	158	#endif /* _LINUX_VIRTIO_NET_H */