CasperSecurity
#ifndef _NET_FLOW_OFFLOAD_H
#define _NET_FLOW_OFFLOAD_H
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netlink.h>
#include <net/flow_dissector.h>
struct flow_match {
struct flow_dissector *dissector;
void *mask;
void *key;
};
struct flow_match_meta {
struct flow_dissector_key_meta *key, *mask;
};
struct flow_match_basic {
struct flow_dissector_key_basic *key, *mask;
};
struct flow_match_control {
struct flow_dissector_key_control *key, *mask;
};
struct flow_match_eth_addrs {
struct flow_dissector_key_eth_addrs *key, *mask;
};
struct flow_match_vlan {
struct flow_dissector_key_vlan *key, *mask;
};
struct flow_match_ipv4_addrs {
struct flow_dissector_key_ipv4_addrs *key, *mask;
};
struct flow_match_ipv6_addrs {
struct flow_dissector_key_ipv6_addrs *key, *mask;
};
struct flow_match_ip {
struct flow_dissector_key_ip *key, *mask;
};
struct flow_match_ports {
struct flow_dissector_key_ports *key, *mask;
};
struct flow_match_ports_range {
struct flow_dissector_key_ports_range *key, *mask;
};
struct flow_match_icmp {
struct flow_dissector_key_icmp *key, *mask;
};
struct flow_match_tcp {
struct flow_dissector_key_tcp *key, *mask;
};
struct flow_match_mpls {
struct flow_dissector_key_mpls *key, *mask;
};
struct flow_match_enc_keyid {
struct flow_dissector_key_keyid *key, *mask;
};
struct flow_match_enc_opts {
struct flow_dissector_key_enc_opts *key, *mask;
};
struct flow_match_ct {
struct flow_dissector_key_ct *key, *mask;
};
struct flow_rule;
void flow_rule_match_meta(const struct flow_rule *rule,
struct flow_match_meta *out);
void flow_rule_match_basic(const struct flow_rule *rule,
struct flow_match_basic *out);
void flow_rule_match_control(const struct flow_rule *rule,
struct flow_match_control *out);
void flow_rule_match_eth_addrs(const struct flow_rule *rule,
struct flow_match_eth_addrs *out);
void flow_rule_match_vlan(const struct flow_rule *rule,
struct flow_match_vlan *out);
void flow_rule_match_cvlan(const struct flow_rule *rule,
struct flow_match_vlan *out);
void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
struct flow_match_ipv4_addrs *out);
void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
struct flow_match_ipv6_addrs *out);
void flow_rule_match_ip(const struct flow_rule *rule,
struct flow_match_ip *out);
void flow_rule_match_ports(const struct flow_rule *rule,
struct flow_match_ports *out);
void flow_rule_match_ports_range(const struct flow_rule *rule,
struct flow_match_ports_range *out);
void flow_rule_match_tcp(const struct flow_rule *rule,
struct flow_match_tcp *out);
void flow_rule_match_icmp(const struct flow_rule *rule,
struct flow_match_icmp *out);
void flow_rule_match_mpls(const struct flow_rule *rule,
struct flow_match_mpls *out);
void flow_rule_match_enc_control(const struct flow_rule *rule,
struct flow_match_control *out);
void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
struct flow_match_ipv4_addrs *out);
void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
struct flow_match_ipv6_addrs *out);
void flow_rule_match_enc_ip(const struct flow_rule *rule,
struct flow_match_ip *out);
void flow_rule_match_enc_ports(const struct flow_rule *rule,
struct flow_match_ports *out);
void flow_rule_match_enc_keyid(const struct flow_rule *rule,
struct flow_match_enc_keyid *out);
void flow_rule_match_enc_opts(const struct flow_rule *rule,
struct flow_match_enc_opts *out);
void flow_rule_match_ct(const struct flow_rule *rule,
struct flow_match_ct *out);
enum flow_action_id {
FLOW_ACTION_ACCEPT = 0,
FLOW_ACTION_DROP,
FLOW_ACTION_TRAP,
FLOW_ACTION_GOTO,
FLOW_ACTION_REDIRECT,
FLOW_ACTION_MIRRED,
FLOW_ACTION_REDIRECT_INGRESS,
FLOW_ACTION_MIRRED_INGRESS,
FLOW_ACTION_VLAN_PUSH,
FLOW_ACTION_VLAN_POP,
FLOW_ACTION_VLAN_MANGLE,
FLOW_ACTION_TUNNEL_ENCAP,
FLOW_ACTION_TUNNEL_DECAP,
FLOW_ACTION_MANGLE,
FLOW_ACTION_ADD,
FLOW_ACTION_CSUM,
FLOW_ACTION_MARK,
FLOW_ACTION_PTYPE,
FLOW_ACTION_PRIORITY,
FLOW_ACTION_WAKE,
FLOW_ACTION_QUEUE,
FLOW_ACTION_SAMPLE,
FLOW_ACTION_POLICE,
FLOW_ACTION_CT,
FLOW_ACTION_CT_METADATA,
FLOW_ACTION_MPLS_PUSH,
FLOW_ACTION_MPLS_POP,
FLOW_ACTION_MPLS_MANGLE,
FLOW_ACTION_GATE,
FLOW_ACTION_PPPOE_PUSH,
NUM_FLOW_ACTIONS,
};
/* This is mirroring enum pedit_header_type definition for easy mapping between
* tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
* FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
*/
enum flow_action_mangle_base {
FLOW_ACT_MANGLE_UNSPEC = 0,
FLOW_ACT_MANGLE_HDR_TYPE_ETH,
FLOW_ACT_MANGLE_HDR_TYPE_IP4,
FLOW_ACT_MANGLE_HDR_TYPE_IP6,
FLOW_ACT_MANGLE_HDR_TYPE_TCP,
FLOW_ACT_MANGLE_HDR_TYPE_UDP,
};
enum flow_action_hw_stats_bit {
FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
FLOW_ACTION_HW_STATS_DELAYED_BIT,
FLOW_ACTION_HW_STATS_DISABLED_BIT,
FLOW_ACTION_HW_STATS_NUM_BITS
};
enum flow_action_hw_stats {
FLOW_ACTION_HW_STATS_IMMEDIATE =
BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
FLOW_ACTION_HW_STATS_ANY = FLOW_ACTION_HW_STATS_IMMEDIATE |
FLOW_ACTION_HW_STATS_DELAYED,
FLOW_ACTION_HW_STATS_DISABLED =
BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
};
typedef void (*action_destr)(void *priv);
struct flow_action_cookie {
u32 cookie_len;
u8 cookie[];
};
struct flow_action_cookie *flow_action_cookie_create(void *data,
unsigned int len,
gfp_t gfp);
void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
struct flow_action_entry {
enum flow_action_id id;
enum flow_action_hw_stats hw_stats;
action_destr destructor;
void *destructor_priv;
union {
u32 chain_index; /* FLOW_ACTION_GOTO */
struct net_device *dev; /* FLOW_ACTION_REDIRECT */
struct { /* FLOW_ACTION_VLAN */
u16 vid;
__be16 proto;
u8 prio;
} vlan;
struct { /* FLOW_ACTION_MANGLE */
/* FLOW_ACTION_ADD */
enum flow_action_mangle_base htype;
u32 offset;
u32 mask;
u32 val;
} mangle;
struct ip_tunnel_info *tunnel; /* FLOW_ACTION_TUNNEL_ENCAP */
u32 csum_flags; /* FLOW_ACTION_CSUM */
u32 mark; /* FLOW_ACTION_MARK */
u16 ptype; /* FLOW_ACTION_PTYPE */
u32 priority; /* FLOW_ACTION_PRIORITY */
struct { /* FLOW_ACTION_QUEUE */
u32 ctx;
u32 index;
u8 vf;
} queue;
struct { /* FLOW_ACTION_SAMPLE */
struct psample_group *psample_group;
u32 rate;
u32 trunc_size;
bool truncate;
} sample;
struct { /* FLOW_ACTION_POLICE */
u32 index;
u32 burst;
u64 rate_bytes_ps;
u64 burst_pkt;
u64 rate_pkt_ps;
u32 mtu;
} police;
struct { /* FLOW_ACTION_CT */
int action;
u16 zone;
struct nf_flowtable *flow_table;
} ct;
struct {
unsigned long cookie;
u32 mark;
u32 labels[4];
bool orig_dir;
} ct_metadata;
struct { /* FLOW_ACTION_MPLS_PUSH */
u32 label;
__be16 proto;
u8 tc;
u8 bos;
u8 ttl;
} mpls_push;
struct { /* FLOW_ACTION_MPLS_POP */
__be16 proto;
} mpls_pop;
struct { /* FLOW_ACTION_MPLS_MANGLE */
u32 label;
u8 tc;
u8 bos;
u8 ttl;
} mpls_mangle;
struct {
u32 index;
s32 prio;
u64 basetime;
u64 cycletime;
u64 cycletimeext;
u32 num_entries;
struct action_gate_entry *entries;
} gate;
struct { /* FLOW_ACTION_PPPOE_PUSH */
u16 sid;
} pppoe;
};
struct flow_action_cookie *cookie; /* user defined action cookie */
};
struct flow_action {
unsigned int num_entries;
struct flow_action_entry entries[];
};
static inline bool flow_action_has_entries(const struct flow_action *action)
{
return action->num_entries;
}
/**
* flow_offload_has_one_action() - check if exactly one action is present
* @action: tc filter flow offload action
*
* Returns true if exactly one action is present.
*/
static inline bool flow_offload_has_one_action(const struct flow_action *action)
{
return action->num_entries == 1;
}
#define flow_action_for_each(__i, __act, __actions) \
for (__i = 0, __act = &(__actions)->entries[0]; \
__i < (__actions)->num_entries; \
__act = &(__actions)->entries[++__i])
static inline bool
flow_action_mixed_hw_stats_check(const struct flow_action *action,
struct netlink_ext_ack *extack)
{
const struct flow_action_entry *action_entry;
u8 last_hw_stats;
int i;
if (flow_offload_has_one_action(action))
return true;
flow_action_for_each(i, action_entry, action) {
if (i && action_entry->hw_stats != last_hw_stats) {
NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
return false;
}
last_hw_stats = action_entry->hw_stats;
}
return true;
}
static inline const struct flow_action_entry *
flow_action_first_entry_get(const struct flow_action *action)
{
WARN_ON(!flow_action_has_entries(action));
return &action->entries[0];
}
static inline bool
__flow_action_hw_stats_check(const struct flow_action *action,
struct netlink_ext_ack *extack,
bool check_allow_bit,
enum flow_action_hw_stats_bit allow_bit)
{
const struct flow_action_entry *action_entry;
if (!flow_action_has_entries(action))
return true;
if (!flow_action_mixed_hw_stats_check(action, extack))
return false;
action_entry = flow_action_first_entry_get(action);
/* Zero is not a legal value for hw_stats, catch anyone passing it */
WARN_ON_ONCE(!action_entry->hw_stats);
if (!check_allow_bit &&
~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
return false;
} else if (check_allow_bit &&
!(action_entry->hw_stats & BIT(allow_bit))) {
NL_SET_ERR_MSG_MOD(extack, "Driver does not support selected HW stats type");
return false;
}
return true;
}
static inline bool
flow_action_hw_stats_check(const struct flow_action *action,
struct netlink_ext_ack *extack,
enum flow_action_hw_stats_bit allow_bit)
{
return __flow_action_hw_stats_check(action, extack, true, allow_bit);
}
static inline bool
flow_action_basic_hw_stats_check(const struct flow_action *action,
struct netlink_ext_ack *extack)
{
return __flow_action_hw_stats_check(action, extack, false, 0);
}
struct flow_rule {
struct flow_match match;
struct flow_action action;
};
struct flow_rule *flow_rule_alloc(unsigned int num_actions);
static inline bool flow_rule_match_key(const struct flow_rule *rule,
enum flow_dissector_key_id key)
{
return dissector_uses_key(rule->match.dissector, key);
}
struct flow_stats {
u64 pkts;
u64 bytes;
u64 drops;
u64 lastused;
enum flow_action_hw_stats used_hw_stats;
bool used_hw_stats_valid;
};
static inline void flow_stats_update(struct flow_stats *flow_stats,
u64 bytes, u64 pkts,
u64 drops, u64 lastused,
enum flow_action_hw_stats used_hw_stats)
{
flow_stats->pkts += pkts;
flow_stats->bytes += bytes;
flow_stats->drops += drops;
flow_stats->lastused = max_t(u64, flow_stats->lastused, lastused);
/* The driver should pass value with a maximum of one bit set.
* Passing FLOW_ACTION_HW_STATS_ANY is invalid.
*/
WARN_ON(used_hw_stats == FLOW_ACTION_HW_STATS_ANY);
flow_stats->used_hw_stats |= used_hw_stats;
flow_stats->used_hw_stats_valid = true;
}
enum flow_block_command {
FLOW_BLOCK_BIND,
FLOW_BLOCK_UNBIND,
};
enum flow_block_binder_type {
FLOW_BLOCK_BINDER_TYPE_UNSPEC,
FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
FLOW_BLOCK_BINDER_TYPE_RED_EARLY_DROP,
FLOW_BLOCK_BINDER_TYPE_RED_MARK,
};
struct flow_block {
struct list_head cb_list;
};
struct netlink_ext_ack;
struct flow_block_offload {
enum flow_block_command command;
enum flow_block_binder_type binder_type;
bool block_shared;
bool unlocked_driver_cb;
struct net *net;
struct flow_block *block;
struct list_head cb_list;
struct list_head *driver_block_list;
struct netlink_ext_ack *extack;
struct Qdisc *sch;
struct list_head *cb_list_head;
};
enum tc_setup_type;
typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
void *cb_priv);
struct flow_block_cb;
struct flow_block_indr {
struct list_head list;
struct net_device *dev;
struct Qdisc *sch;
enum flow_block_binder_type binder_type;
void *data;
void *cb_priv;
void (*cleanup)(struct flow_block_cb *block_cb);
};
struct flow_block_cb {
struct list_head driver_list;
struct list_head list;
flow_setup_cb_t *cb;
void *cb_ident;
void *cb_priv;
void (*release)(void *cb_priv);
struct flow_block_indr indr;
unsigned int refcnt;
};
struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
void *cb_ident, void *cb_priv,
void (*release)(void *cb_priv));
struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
void *cb_ident, void *cb_priv,
void (*release)(void *cb_priv),
struct flow_block_offload *bo,
struct net_device *dev,
struct Qdisc *sch, void *data,
void *indr_cb_priv,
void (*cleanup)(struct flow_block_cb *block_cb));
void flow_block_cb_free(struct flow_block_cb *block_cb);
struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
flow_setup_cb_t *cb, void *cb_ident);
void *flow_block_cb_priv(struct flow_block_cb *block_cb);
void flow_block_cb_incref(struct flow_block_cb *block_cb);
unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
struct flow_block_offload *offload)
{
list_add_tail(&block_cb->list, &offload->cb_list);
}
static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
struct flow_block_offload *offload)
{
list_move(&block_cb->list, &offload->cb_list);
}
static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
struct flow_block_offload *offload)
{
list_del(&block_cb->indr.list);
list_move(&block_cb->list, &offload->cb_list);
}
bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
struct list_head *driver_block_list);
int flow_block_cb_setup_simple(struct flow_block_offload *f,
struct list_head *driver_list,
flow_setup_cb_t *cb,
void *cb_ident, void *cb_priv, bool ingress_only);
enum flow_cls_command {
FLOW_CLS_REPLACE,
FLOW_CLS_DESTROY,
FLOW_CLS_STATS,
FLOW_CLS_TMPLT_CREATE,
FLOW_CLS_TMPLT_DESTROY,
};
struct flow_cls_common_offload {
u32 chain_index;
__be16 protocol;
u32 prio;
struct netlink_ext_ack *extack;
};
struct flow_cls_offload {
struct flow_cls_common_offload common;
enum flow_cls_command command;
unsigned long cookie;
struct flow_rule *rule;
struct flow_stats stats;
u32 classid;
};
static inline struct flow_rule *
flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
{
return flow_cmd->rule;
}
static inline void flow_block_init(struct flow_block *flow_block)
{
INIT_LIST_HEAD(&flow_block->cb_list);
}
typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
enum tc_setup_type type, void *type_data,
void *data,
void (*cleanup)(struct flow_block_cb *block_cb));
int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
void (*release)(void *cb_priv));
int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
enum tc_setup_type type, void *data,
struct flow_block_offload *bo,
void (*cleanup)(struct flow_block_cb *block_cb));
bool flow_indr_dev_exists(void);
#endif /* _NET_FLOW_OFFLOAD_H */