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/*
* sfe_ipv6.h
* Shortcut forwarding engine header file for IPv6.
*
* Copyright (c) 2015-2016, 2019-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __SFE_IPV6_H
#define __SFE_IPV6_H
#define CHAR_DEV_MSG_SIZE 768
#define SFE_IPV6_DSCP_MASK 0xf03f
#define SFE_IPV6_DSCP_SHIFT 2
#define SFE_IPV6_FRAG_OFFSET 0xfff8
/*
* generic IPv6 extension header
*/
struct sfe_ipv6_ext_hdr {
__u8 next_hdr;
__u8 hdr_len;
__u8 padding[6];
};
/*
* Specifies the lower bound on ACK numbers carried in the TCP header
*/
#define SFE_IPV6_TCP_MAX_ACK_WINDOW 65520
/*
* IPv6 TCP connection match additional data.
*/
struct sfe_ipv6_tcp_connection_match {
u8 win_scale; /* Window scale */
u32 max_win; /* Maximum window size seen */
u32 end; /* Sequence number of the next byte to send (seq + segment length) */
u32 max_end; /* Sequence number of the last byte to ack */
};
/*
* Bit flags for IPv6 connection matching entry.
*/
#define SFE_IPV6_CONNECTION_MATCH_FLAG_XLATE_SRC (1<<0)
/* Perform source translation */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_XLATE_DEST (1<<1)
/* Perform destination translation */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK (1<<2)
/* Ignore TCP sequence numbers */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_WRITE_FAST_ETH_HDR (1<<3)
/* Fast Ethernet header write */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_WRITE_L2_HDR (1<<4)
/* Fast Ethernet header write */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_PRIORITY_REMARK (1<<5)
/* remark priority of SKB */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_DSCP_REMARK (1<<6)
/* remark DSCP of packet */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_CSUM_OFFLOAD (1<<7)
/* checksum offload.*/
#define SFE_IPV6_CONNECTION_MATCH_FLAG_PPPOE_DECAP (1<<8)
/* Indicates that PPPoE should be decapsulated */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_PPPOE_ENCAP (1<<9)
/* Indicates that PPPoE should be encapsulated */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_BRIDGE_FLOW (1<<10)
/* Bridge flow */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_MARK (1<<11)
/* set skb mark*/
#define SFE_IPV6_CONNECTION_MATCH_FLAG_INSERT_EGRESS_VLAN_TAG (1<<12)
/* Insert VLAN tag */
#define SFE_IPV6_CONNECTION_MATCH_FLAG_SRC_INTERFACE_CHECK (1<<13)
/* Source interface check.*/
/*
* IPv6 connection matching structure.
*/
struct sfe_ipv6_connection_match {
/*
* References to other objects.
*/
struct hlist_node hnode;
struct sfe_ipv6_connection *connection;
struct sfe_ipv6_connection_match *counter_match;
/* Matches the flow in the opposite direction as the one in connection */
/*
* Characteristics that identify flows that match this rule.
*/
struct net_device *match_dev; /* Network device */
u8 match_protocol; /* Protocol */
struct sfe_ipv6_addr match_src_ip[1]; /* Source IP address */
struct sfe_ipv6_addr match_dest_ip[1]; /* Destination IP address */
__be16 match_src_port; /* Source port/connection ident */
__be16 match_dest_port; /* Destination port/connection ident */
struct udp_sock *up; /* Stores UDP sock information; valid only in decap path */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
const struct inet6_protocol *proto; /* stores protocol handler; valid only in decap path */
#else
struct inet6_protocol *proto; /* stores protocol handler; valid only in decap path */
#endif
/*
* Control the operations of the match.
*/
u32 flags; /* Bit flags */
#ifdef CONFIG_NF_FLOW_COOKIE
u32 flow_cookie; /* used flow cookie, for debug */
#endif
#ifdef CONFIG_XFRM
u32 flow_accel; /* The flow accelerated or not */
#endif
/*
* Connection state that we track once we match.
*/
union { /* Protocol-specific state */
struct sfe_ipv6_tcp_connection_match tcp;
} protocol_state;
/*
* VLAN headers
*/
struct sfe_vlan_hdr ingress_vlan_hdr[SFE_MAX_VLAN_DEPTH];
struct sfe_vlan_hdr egress_vlan_hdr[SFE_MAX_VLAN_DEPTH];
/*
* Stats recorded in a sync period. These stats will be added to
* rx_packet_count64/rx_byte_count64 after a sync period.
*/
atomic_t rx_packet_count;
atomic_t rx_byte_count;
/*
* Packet translation information.
*/
struct sfe_ipv6_addr xlate_src_ip[1]; /* Address after source translation */
__be16 xlate_src_port; /* Port/connection ident after source translation */
u16 xlate_src_csum_adjustment;
/* Transport layer checksum adjustment after source translation */
struct sfe_ipv6_addr xlate_dest_ip[1]; /* Address after destination translation */
__be16 xlate_dest_port; /* Port/connection ident after destination translation */
u16 xlate_dest_csum_adjustment;
/* Transport layer checksum adjustment after destination translation */
u32 mark; /* mark for outgoing packet */
/*
* QoS information
*/
u32 priority;
u32 dscp;
/*
* Packet transmit information.
*/
struct net_device *xmit_dev; /* Network device on which to transmit */
unsigned short int xmit_dev_mtu;
/* Interface MTU */
u16 xmit_dest_mac[ETH_ALEN / 2];
/* Destination MAC address to use when forwarding */
u16 xmit_src_mac[ETH_ALEN / 2];
/* Source MAC address to use when forwarding */
u8 ingress_vlan_hdr_cnt; /* Ingress active vlan headers count */
u8 egress_vlan_hdr_cnt; /* Egress active vlan headers count */
/*
* Summary stats.
*/
u64 rx_packet_count64;
u64 rx_byte_count64;
/*
* PPPoE information.
*/
u16 pppoe_session_id;
u8 pppoe_remote_mac[ETH_ALEN];
/*
* Size of all needed L2 headers
*/
u16 l2_hdr_size;
};
/*
* Per-connection data structure.
*/
struct sfe_ipv6_connection {
struct sfe_ipv6_connection *next;
/* Pointer to the next entry in a hash chain */
struct sfe_ipv6_connection *prev;
/* Pointer to the previous entry in a hash chain */
int protocol; /* IP protocol number */
struct sfe_ipv6_addr src_ip[1]; /* Src IP addr pre-translation */
struct sfe_ipv6_addr src_ip_xlate[1]; /* Src IP addr post-translation */
struct sfe_ipv6_addr dest_ip[1]; /* Dest IP addr pre-translation */
struct sfe_ipv6_addr dest_ip_xlate[1]; /* Dest IP addr post-translation */
__be16 src_port; /* Src port pre-translation */
__be16 src_port_xlate; /* Src port post-translation */
__be16 dest_port; /* Dest port pre-translation */
__be16 dest_port_xlate; /* Dest port post-translation */
struct sfe_ipv6_connection_match *original_match;
/* Original direction matching structure */
struct net_device *original_dev;
/* Original direction source device */
struct sfe_ipv6_connection_match *reply_match;
/* Reply direction matching structure */
struct net_device *reply_dev; /* Reply direction source device */
u64 last_sync_jiffies; /* Jiffies count for the last sync */
struct sfe_ipv6_connection *all_connections_next;
/* Pointer to the next entry in the list of all connections */
struct sfe_ipv6_connection *all_connections_prev;
/* Pointer to the previous entry in the list of all connections */
bool removed; /* Indicates the connection is removed */
struct rcu_head rcu; /* delay rcu free */
u32 debug_read_seq; /* sequence number for debug dump */
};
/*
* IPv6 connections and hash table size information.
*/
#define SFE_IPV6_CONNECTION_HASH_SHIFT 12
#define SFE_IPV6_CONNECTION_HASH_SIZE (1 << SFE_IPV6_CONNECTION_HASH_SHIFT)
#define SFE_IPV6_CONNECTION_HASH_MASK (SFE_IPV6_CONNECTION_HASH_SIZE - 1)
enum sfe_ipv6_exception_events {
SFE_IPV6_EXCEPTION_EVENT_UDP_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_UDP_NO_CONNECTION,
SFE_IPV6_EXCEPTION_EVENT_UDP_IP_OPTIONS_OR_INITIAL_FRAGMENT,
SFE_IPV6_EXCEPTION_EVENT_UDP_SMALL_TTL,
SFE_IPV6_EXCEPTION_EVENT_UDP_NEEDS_FRAGMENTATION,
SFE_IPV6_EXCEPTION_EVENT_TCP_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_TCP_NO_CONNECTION_SLOW_FLAGS,
SFE_IPV6_EXCEPTION_EVENT_TCP_NO_CONNECTION_FAST_FLAGS,
SFE_IPV6_EXCEPTION_EVENT_TCP_IP_OPTIONS_OR_INITIAL_FRAGMENT,
SFE_IPV6_EXCEPTION_EVENT_TCP_SMALL_TTL,
SFE_IPV6_EXCEPTION_EVENT_TCP_NEEDS_FRAGMENTATION,
SFE_IPV6_EXCEPTION_EVENT_TCP_FLAGS,
SFE_IPV6_EXCEPTION_EVENT_TCP_SEQ_EXCEEDS_RIGHT_EDGE,
SFE_IPV6_EXCEPTION_EVENT_TCP_SMALL_DATA_OFFS,
SFE_IPV6_EXCEPTION_EVENT_TCP_BAD_SACK,
SFE_IPV6_EXCEPTION_EVENT_TCP_BIG_DATA_OFFS,
SFE_IPV6_EXCEPTION_EVENT_TCP_SEQ_BEFORE_LEFT_EDGE,
SFE_IPV6_EXCEPTION_EVENT_TCP_ACK_EXCEEDS_RIGHT_EDGE,
SFE_IPV6_EXCEPTION_EVENT_TCP_ACK_BEFORE_LEFT_EDGE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_UNHANDLED_TYPE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_NON_V6,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_IP_OPTIONS_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_UDP_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_TCP_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_ICMP_IPV6_UNHANDLED_PROTOCOL,
SFE_IPV6_EXCEPTION_EVENT_ICMP_NO_CONNECTION,
SFE_IPV6_EXCEPTION_EVENT_ICMP_FLUSHED_CONNECTION,
SFE_IPV6_EXCEPTION_EVENT_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_BAD_TOTAL_LENGTH,
SFE_IPV6_EXCEPTION_EVENT_NON_V6,
SFE_IPV6_EXCEPTION_EVENT_NON_INITIAL_FRAGMENT,
SFE_IPV6_EXCEPTION_EVENT_DATAGRAM_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_IP_OPTIONS_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_UNHANDLED_PROTOCOL,
SFE_IPV6_EXCEPTION_EVENT_FLOW_COOKIE_ADD_FAIL,
SFE_IPV6_EXCEPTION_EVENT_NO_HEADROOM,
SFE_IPV6_EXCEPTION_EVENT_INVALID_PPPOE_SESSION,
SFE_IPV6_EXCEPTION_EVENT_INCORRECT_PPPOE_PARSING,
SFE_IPV6_EXCEPTION_EVENT_PPPOE_NOT_SET_IN_CME,
SFE_IPV6_EXCEPTION_EVENT_NOT_ENOUGH_HEADROOM,
SFE_IPV6_EXCEPTION_EVENT_INGRESS_VLAN_TAG_MISMATCH,
SFE_IPV6_EXCEPTION_EVENT_INVALID_SRC_IFACE,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_HEADER_INCOMPLETE,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_NO_CONNECTION,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_IP_OPTIONS_OR_INITIAL_FRAGMENT,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_SMALL_TTL,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_NEEDS_FRAGMENTATION,
SFE_IPV6_EXCEPTION_EVENT_TUNIPIP6_SYNC_ON_FIND,
SFE_IPV6_EXCEPTION_EVENT_LAST
};
/*
* Per CPU stats
*/
struct sfe_ipv6_stats {
/*
* Stats recorded in a sync period. These stats will be added to
* connection_xxx64 after a sync period.
*/
u64 connection_create_requests64;
/* Number of IPv6 connection create requests */
u64 connection_create_collisions64;
/* Number of IPv6 connection create requests that collided with existing hash table entries */
u64 connection_create_failures64;
/* Number of IPv6 connection create requests failures. */
u64 connection_destroy_requests64;
/* Number of IPv6 connection destroy requests */
u64 connection_destroy_misses64;
/* Number of IPv6 connection destroy requests that missed our hash table */
u64 connection_match_hash_hits64;
/* Number of IPv6 connection match hash hits */
u64 connection_match_hash_reorders64;
/* Number of IPv6 connection match hash reorders */
u64 connection_flushes64; /* Number of IPv6 connection flushes */
u64 packets_dropped64; /* Number of IPv4 packets dropped */
u64 packets_forwarded64; /* Number of IPv6 packets forwarded */
u64 packets_not_forwarded64; /* Number of IPv6 packets not forwarded */
u64 exception_events64[SFE_IPV6_EXCEPTION_EVENT_LAST];
u64 pppoe_encap_packets_forwarded64; /* Number of IPv6 PPPoE encap packets forwarded */
u64 pppoe_decap_packets_forwarded64; /* Number of IPv6 PPPoE decap packets forwarded */
u64 pppoe_bridge_packets_forwarded64; /* Number of IPv6 PPPoE decap packets forwarded */
};
/*
* Per-module structure.
*/
struct sfe_ipv6 {
spinlock_t lock; /* Lock for SMP correctness */
struct sfe_ipv6_connection *all_connections_head;
/* Head of the list of all connections */
struct sfe_ipv6_connection *all_connections_tail;
/* Tail of the list of all connections */
unsigned int num_connections; /* Number of connections */
struct delayed_work sync_dwork; /* Work to sync the statistics */
unsigned int work_cpu; /* The core to run stats sync on */
sfe_sync_rule_callback_t __rcu sync_rule_callback;
/* Callback function registered by a connection manager for stats syncing */
struct sfe_ipv6_connection *conn_hash[SFE_IPV6_CONNECTION_HASH_SIZE];
/* Connection hash table */
struct hlist_head hlist_conn_match_hash_head[SFE_IPV6_CONNECTION_HASH_SIZE];
#ifdef CONFIG_NF_FLOW_COOKIE
struct sfe_ipv6_flow_cookie_entry sfe_flow_cookie_table[SFE_FLOW_COOKIE_SIZE];
/* flow cookie table*/
sfe_ipv6_flow_cookie_set_func_t flow_cookie_set_func;
/* function used to configure flow cookie in hardware*/
int flow_cookie_enable;
/* Enable/disable flow cookie at runtime */
#endif
struct sfe_ipv6_stats __percpu *stats_pcpu;
/* Common SFE counters. */
struct sfe_ipv6_connection *wc_next;
/* The next walk point in the all connection list*/
/*
* Control state.
*/
struct kobject *sys_ipv6; /* sysfs linkage */
int debug_dev; /* Major number of the debug char device */
u32 debug_read_seq; /* sequence number for debug dump */
};
/*
* Enumeration of the XML output.
*/
enum sfe_ipv6_debug_xml_states {
SFE_IPV6_DEBUG_XML_STATE_START,
SFE_IPV6_DEBUG_XML_STATE_CONNECTIONS_START,
SFE_IPV6_DEBUG_XML_STATE_CONNECTIONS_CONNECTION,
SFE_IPV6_DEBUG_XML_STATE_CONNECTIONS_END,
SFE_IPV6_DEBUG_XML_STATE_EXCEPTIONS_START,
SFE_IPV6_DEBUG_XML_STATE_EXCEPTIONS_EXCEPTION,
SFE_IPV6_DEBUG_XML_STATE_EXCEPTIONS_END,
SFE_IPV6_DEBUG_XML_STATE_STATS,
SFE_IPV6_DEBUG_XML_STATE_END,
SFE_IPV6_DEBUG_XML_STATE_DONE
};
/*
* XML write state.
*/
struct sfe_ipv6_debug_xml_write_state {
enum sfe_ipv6_debug_xml_states state;
/* XML output file state machine state */
int iter_exception; /* Next exception iterator */
};
typedef bool (*sfe_ipv6_debug_xml_write_method_t)(struct sfe_ipv6 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv6_debug_xml_write_state *ws);
/*
* sfe_ipv6_is_ext_hdr()
* check if we recognize ipv6 extension header
*/
static inline bool sfe_ipv6_is_ext_hdr(u8 hdr)
{
return (hdr == NEXTHDR_HOP) ||
(hdr == NEXTHDR_ROUTING) ||
(hdr == NEXTHDR_FRAGMENT) ||
(hdr == NEXTHDR_AUTH) ||
(hdr == NEXTHDR_DEST) ||
(hdr == NEXTHDR_MOBILITY);
}
/*
* sfe_ipv6_change_dsfield()
* change dscp field in IPv6 packet
*/
static inline void sfe_ipv6_change_dsfield(struct ipv6hdr *iph, u8 dscp)
{
__be16 *p = (__be16 *)iph;
*p = ((*p & htons(SFE_IPV6_DSCP_MASK)) | htons((u16)dscp << 4));
}
void sfe_ipv6_exception_stats_inc(struct sfe_ipv6 *si, enum sfe_ipv6_exception_events reason);
struct sfe_ipv6_connection_match *
sfe_ipv6_find_connection_match_rcu(struct sfe_ipv6 *si, struct net_device *dev, u8 protocol,
struct sfe_ipv6_addr *src_ip, __be16 src_port,
struct sfe_ipv6_addr *dest_ip, __be16 dest_port);
bool sfe_ipv6_remove_connection(struct sfe_ipv6 *si, struct sfe_ipv6_connection *c);
void sfe_ipv6_flush_connection(struct sfe_ipv6 *si,
struct sfe_ipv6_connection *c,
sfe_sync_reason_t reason);
void sfe_ipv6_sync_status(struct sfe_ipv6 *si,
struct sfe_ipv6_connection *c,
sfe_sync_reason_t reason);
void sfe_ipv6_exit(void);
int sfe_ipv6_init(void);
#endif /* __SFE_IPV6_H */