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linux/include/net/macsec.h
Rahul Rameshbabu 475747a193 macsec: Enable devices to advertise whether they update sk_buff md_dst during offloads 
Cannot know whether a Rx skb missing md_dst is intended for MACsec or not
without knowing whether the device is able to update this field during an
offload. Assume that an offload to a MACsec device cannot support updating
md_dst by default. Capable devices can advertise that they do indicate that
an skb is related to a MACsec offloaded packet using the md_dst.

Cc: Sabrina Dubroca <sd@queasysnail.net>
Cc: stable@vger.kernel.org
Fixes: 860ead89b8 ("net/macsec: Add MACsec skb_metadata_dst Rx Data path support")
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Benjamin Poirier <bpoirier@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/20240423181319.115860-2-rrameshbabu@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-04-25 08:20:54 -07:00

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* MACsec netdev header, used for h/w accelerated implementations.
*
* Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
*/
#ifndef _NET_MACSEC_H_
#define _NET_MACSEC_H_
#include <linux/u64_stats_sync.h>
#include <linux/if_vlan.h>
#include <uapi/linux/if_link.h>
#include <uapi/linux/if_macsec.h>
#define MACSEC_DEFAULT_PN_LEN 4
#define MACSEC_XPN_PN_LEN 8
#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
#define MACSEC_SCI_LEN 8
#define MACSEC_PORT_ES (htons(0x0001))
#define MACSEC_TCI_VERSION 0x80
#define MACSEC_TCI_ES 0x40 /* end station */
#define MACSEC_TCI_SC 0x20 /* SCI present */
#define MACSEC_TCI_SCB 0x10 /* epon */
#define MACSEC_TCI_E 0x08 /* encryption */
#define MACSEC_TCI_C 0x04 /* changed text */
#define MACSEC_AN_MASK 0x03 /* association number */
#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
#define MACSEC_DEFAULT_ICV_LEN 16
typedef u64 __bitwise sci_t;
typedef u32 __bitwise ssci_t;
struct metadata_dst;
typedef union salt {
struct {
u32 ssci;
u64 pn;
} __packed;
u8 bytes[MACSEC_SALT_LEN];
} __packed salt_t;
typedef union pn {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
u32 lower;
u32 upper;
#elif defined(__BIG_ENDIAN_BITFIELD)
u32 upper;
u32 lower;
#else
#error "Please fix <asm/byteorder.h>"
#endif
};
u64 full64;
} pn_t;
/**
* struct macsec_key - SA key
* @id: user-provided key identifier
* @tfm: crypto struct, key storage
* @salt: salt used to generate IV in XPN cipher suites
*/
struct macsec_key {
u8 id[MACSEC_KEYID_LEN];
struct crypto_aead *tfm;
salt_t salt;
};
struct macsec_rx_sc_stats {
__u64 InOctetsValidated;
__u64 InOctetsDecrypted;
__u64 InPktsUnchecked;
__u64 InPktsDelayed;
__u64 InPktsOK;
__u64 InPktsInvalid;
__u64 InPktsLate;
__u64 InPktsNotValid;
__u64 InPktsNotUsingSA;
__u64 InPktsUnusedSA;
};
struct macsec_rx_sa_stats {
__u32 InPktsOK;
__u32 InPktsInvalid;
__u32 InPktsNotValid;
__u32 InPktsNotUsingSA;
__u32 InPktsUnusedSA;
};
struct macsec_tx_sa_stats {
__u32 OutPktsProtected;
__u32 OutPktsEncrypted;
};
struct macsec_tx_sc_stats {
__u64 OutPktsProtected;
__u64 OutPktsEncrypted;
__u64 OutOctetsProtected;
__u64 OutOctetsEncrypted;
};
struct macsec_dev_stats {
__u64 OutPktsUntagged;
__u64 InPktsUntagged;
__u64 OutPktsTooLong;
__u64 InPktsNoTag;
__u64 InPktsBadTag;
__u64 InPktsUnknownSCI;
__u64 InPktsNoSCI;
__u64 InPktsOverrun;
};
/**
* struct macsec_rx_sa - receive secure association
* @active:
* @next_pn: packet number expected for the next packet
* @lock: protects next_pn manipulations
* @key: key structure
* @ssci: short secure channel identifier
* @stats: per-SA stats
*/
struct macsec_rx_sa {
struct macsec_key key;
ssci_t ssci;
spinlock_t lock;
union {
pn_t next_pn_halves;
u64 next_pn;
};
refcount_t refcnt;
bool active;
struct macsec_rx_sa_stats __percpu *stats;
struct macsec_rx_sc *sc;
struct rcu_head rcu;
};
struct pcpu_rx_sc_stats {
struct macsec_rx_sc_stats stats;
struct u64_stats_sync syncp;
};
struct pcpu_tx_sc_stats {
struct macsec_tx_sc_stats stats;
struct u64_stats_sync syncp;
};
/**
* struct macsec_rx_sc - receive secure channel
* @sci: secure channel identifier for this SC
* @active: channel is active
* @sa: array of secure associations
* @stats: per-SC stats
*/
struct macsec_rx_sc {
struct macsec_rx_sc __rcu *next;
sci_t sci;
bool active;
struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
struct pcpu_rx_sc_stats __percpu *stats;
refcount_t refcnt;
struct rcu_head rcu_head;
};
/**
* struct macsec_tx_sa - transmit secure association
* @active:
* @next_pn: packet number to use for the next packet
* @lock: protects next_pn manipulations
* @key: key structure
* @ssci: short secure channel identifier
* @stats: per-SA stats
*/
struct macsec_tx_sa {
struct macsec_key key;
ssci_t ssci;
spinlock_t lock;
union {
pn_t next_pn_halves;
u64 next_pn;
};
refcount_t refcnt;
bool active;
struct macsec_tx_sa_stats __percpu *stats;
struct rcu_head rcu;
};
/**
* struct macsec_tx_sc - transmit secure channel
* @active:
* @encoding_sa: association number of the SA currently in use
* @encrypt: encrypt packets on transmit, or authenticate only
* @send_sci: always include the SCI in the SecTAG
* @end_station:
* @scb: single copy broadcast flag
* @sa: array of secure associations
* @stats: stats for this TXSC
* @md_dst: MACsec offload metadata dst
*/
struct macsec_tx_sc {
bool active;
u8 encoding_sa;
bool encrypt;
bool send_sci;
bool end_station;
bool scb;
struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
struct pcpu_tx_sc_stats __percpu *stats;
struct metadata_dst *md_dst;
};
/**
* struct macsec_secy - MACsec Security Entity
* @netdev: netdevice for this SecY
* @n_rx_sc: number of receive secure channels configured on this SecY
* @sci: secure channel identifier used for tx
* @key_len: length of keys used by the cipher suite
* @icv_len: length of ICV used by the cipher suite
* @validate_frames: validation mode
* @xpn: enable XPN for this SecY
* @operational: MAC_Operational flag
* @protect_frames: enable protection for this SecY
* @replay_protect: enable packet number checks on receive
* @replay_window: size of the replay window
* @tx_sc: transmit secure channel
* @rx_sc: linked list of receive secure channels
*/
struct macsec_secy {
struct net_device *netdev;
unsigned int n_rx_sc;
sci_t sci;
u16 key_len;
u16 icv_len;
enum macsec_validation_type validate_frames;
bool xpn;
bool operational;
bool protect_frames;
bool replay_protect;
u32 replay_window;
struct macsec_tx_sc tx_sc;
struct macsec_rx_sc __rcu *rx_sc;
};
/**
* struct macsec_context - MACsec context for hardware offloading
* @netdev: a valid pointer to a struct net_device if @offload ==
* MACSEC_OFFLOAD_MAC
* @phydev: a valid pointer to a struct phy_device if @offload ==
* MACSEC_OFFLOAD_PHY
* @offload: MACsec offload status
* @secy: pointer to a MACsec SecY
* @rx_sc: pointer to a RX SC
* @update_pn: when updating the SA, update the next PN
* @assoc_num: association number of the target SA
* @key: key of the target SA
* @rx_sa: pointer to an RX SA if a RX SA is added/updated/removed
* @tx_sa: pointer to an TX SA if a TX SA is added/updated/removed
* @tx_sc_stats: pointer to TX SC stats structure
* @tx_sa_stats: pointer to TX SA stats structure
* @rx_sc_stats: pointer to RX SC stats structure
* @rx_sa_stats: pointer to RX SA stats structure
* @dev_stats: pointer to dev stats structure
*/
struct macsec_context {
union {
struct net_device *netdev;
struct phy_device *phydev;
};
enum macsec_offload offload;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct {
bool update_pn;
unsigned char assoc_num;
u8 key[MACSEC_MAX_KEY_LEN];
union {
struct macsec_rx_sa *rx_sa;
struct macsec_tx_sa *tx_sa;
};
} sa;
union {
struct macsec_tx_sc_stats *tx_sc_stats;
struct macsec_tx_sa_stats *tx_sa_stats;
struct macsec_rx_sc_stats *rx_sc_stats;
struct macsec_rx_sa_stats *rx_sa_stats;
struct macsec_dev_stats *dev_stats;
} stats;
};
/**
* struct macsec_ops - MACsec offloading operations
* @mdo_dev_open: called when the MACsec interface transitions to the up state
* @mdo_dev_stop: called when the MACsec interface transitions to the down
* state
* @mdo_add_secy: called when a new SecY is added
* @mdo_upd_secy: called when the SecY flags are changed or the MAC address of
* the MACsec interface is changed
* @mdo_del_secy: called when the hw offload is disabled or the MACsec
* interface is removed
* @mdo_add_rxsc: called when a new RX SC is added
* @mdo_upd_rxsc: called when a certain RX SC is updated
* @mdo_del_rxsc: called when a certain RX SC is removed
* @mdo_add_rxsa: called when a new RX SA is added
* @mdo_upd_rxsa: called when a certain RX SA is updated
* @mdo_del_rxsa: called when a certain RX SA is removed
* @mdo_add_txsa: called when a new TX SA is added
* @mdo_upd_txsa: called when a certain TX SA is updated
* @mdo_del_txsa: called when a certain TX SA is removed
* @mdo_get_dev_stats: called when dev stats are read
* @mdo_get_tx_sc_stats: called when TX SC stats are read
* @mdo_get_tx_sa_stats: called when TX SA stats are read
* @mdo_get_rx_sc_stats: called when RX SC stats are read
* @mdo_get_rx_sa_stats: called when RX SA stats are read
* @mdo_insert_tx_tag: called to insert the TX tag
* @needed_headroom: number of bytes reserved at the beginning of the sk_buff
* for the TX tag
* @needed_tailroom: number of bytes reserved at the end of the sk_buff for the
* TX tag
* @rx_uses_md_dst: whether MACsec device offload supports sk_buff md_dst
*/
struct macsec_ops {
/* Device wide */
int (*mdo_dev_open)(struct macsec_context *ctx);
int (*mdo_dev_stop)(struct macsec_context *ctx);
/* SecY */
int (*mdo_add_secy)(struct macsec_context *ctx);
int (*mdo_upd_secy)(struct macsec_context *ctx);
int (*mdo_del_secy)(struct macsec_context *ctx);
/* Security channels */
int (*mdo_add_rxsc)(struct macsec_context *ctx);
int (*mdo_upd_rxsc)(struct macsec_context *ctx);
int (*mdo_del_rxsc)(struct macsec_context *ctx);
/* Security associations */
int (*mdo_add_rxsa)(struct macsec_context *ctx);
int (*mdo_upd_rxsa)(struct macsec_context *ctx);
int (*mdo_del_rxsa)(struct macsec_context *ctx);
int (*mdo_add_txsa)(struct macsec_context *ctx);
int (*mdo_upd_txsa)(struct macsec_context *ctx);
int (*mdo_del_txsa)(struct macsec_context *ctx);
/* Statistics */
int (*mdo_get_dev_stats)(struct macsec_context *ctx);
int (*mdo_get_tx_sc_stats)(struct macsec_context *ctx);
int (*mdo_get_tx_sa_stats)(struct macsec_context *ctx);
int (*mdo_get_rx_sc_stats)(struct macsec_context *ctx);
int (*mdo_get_rx_sa_stats)(struct macsec_context *ctx);
/* Offload tag */
int (*mdo_insert_tx_tag)(struct phy_device *phydev,
struct sk_buff *skb);
unsigned int needed_headroom;
unsigned int needed_tailroom;
bool rx_uses_md_dst;
};
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa);
static inline bool macsec_send_sci(const struct macsec_secy *secy)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
return tx_sc->send_sci ||
(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
}
struct net_device *macsec_get_real_dev(const struct net_device *dev);
bool macsec_netdev_is_offloaded(struct net_device *dev);
static inline void *macsec_netdev_priv(const struct net_device *dev)
{
#if IS_ENABLED(CONFIG_VLAN_8021Q)
if (is_vlan_dev(dev))
return netdev_priv(vlan_dev_priv(dev)->real_dev);
#endif
return netdev_priv(dev);
}
static inline u64 sci_to_cpu(sci_t sci)
{
return be64_to_cpu((__force __be64)sci);
}
#endif /* _NET_MACSEC_H_ */
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