/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NETWORK_HELPERS_H
#define __NETWORK_HELPERS_H
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/types.h>
typedef __u16 __sum16;
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>
#include <linux/err.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <bpf/bpf_endian.h>
#include <net/if.h>
#include <stdio.h>

#define MAGIC_VAL 0x1234
#define NUM_ITER 100000
#define VIP_NUM 5
#define MAGIC_BYTES 123

struct network_helper_opts {
        int timeout_ms;
        int proto;
        /* +ve: Passed to listen() as-is.
         *   0: Default when the test does not set
         *      a particular value during the struct init.
         *      It is changed to 1 before passing to listen().
         *      Most tests only have one on-going connection.
         * -ve: It is changed to 0 before passing to listen().
         *      It is useful to force syncookie without
         *      changing the "tcp_syncookies" sysctl from 1 to 2.
         */
        int backlog;
        int (*post_socket_cb)(int fd, void *opts);
        void *cb_opts;
};

/* ipv4 test vector */
struct ipv4_packet {
        struct ethhdr eth;
        struct iphdr iph;
        struct tcphdr tcp;
} __packed;
extern struct ipv4_packet pkt_v4;

/* ipv6 test vector */
struct ipv6_packet {
        struct ethhdr eth;
        struct ipv6hdr iph;
        struct tcphdr tcp;
} __packed;
extern struct ipv6_packet pkt_v6;

int settimeo(int fd, int timeout_ms);
int start_server_str(int family, int type, const char *addr_str, __u16 port,
                     const struct network_helper_opts *opts);
int start_server(int family, int type, const char *addr, __u16 port,
                 int timeout_ms);
int *start_reuseport_server(int family, int type, const char *addr_str,
                            __u16 port, int timeout_ms,
                            unsigned int nr_listens);
int start_server_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
                      const struct network_helper_opts *opts);
void free_fds(int *fds, unsigned int nr_close_fds);
int client_socket(int family, int type,
                  const struct network_helper_opts *opts);
int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
                    const struct network_helper_opts *opts);
int connect_to_addr_str(int family, int type, const char *addr_str, __u16 port,
                        const struct network_helper_opts *opts);
int connect_to_fd(int server_fd, int timeout_ms);
int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
                     int timeout_ms);
int make_sockaddr(int family, const char *addr_str, __u16 port,
                  struct sockaddr_storage *addr, socklen_t *len);
char *ping_command(int family);
int get_socket_local_port(int sock_fd);
int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);

int open_tuntap(const char *dev_name, bool need_mac);

struct nstoken;
/**
 * open_netns() - Switch to specified network namespace by name.
 *
 * Returns token with which to restore the original namespace
 * using close_netns().
 */
struct nstoken *open_netns(const char *name);
void close_netns(struct nstoken *token);
int send_recv_data(int lfd, int fd, uint32_t total_bytes);
int make_netns(const char *name);
int remove_netns(const char *name);

/**
 * append_tid() - Append thread ID to the given string.
 *
 * @str: string to extend
 * @sz: string's size
 *
 * 8 characters are used to append the thread ID (7 digits + '\0')
 *
 * Returns -1 on errors, 0 otherwise
 */
int append_tid(char *str, size_t sz);

static __u16 csum_fold(__u32 csum)
{
        csum = (csum & 0xffff) + (csum >> 16);
        csum = (csum & 0xffff) + (csum >> 16);

        return (__u16)~csum;
}

static __wsum csum_partial(const void *buf, int len, __wsum sum)
{
        __u16 *p = (__u16 *)buf;
        int num_u16 = len >> 1;
        int i;

        for (i = 0; i < num_u16; i++)
                sum += p[i];

        return sum;
}

static inline __sum16 build_ip_csum(struct iphdr *iph)
{
        __u32 sum = 0;
        __u16 *p;

        iph->check = 0;
        p = (void *)iph;
        sum = csum_partial(p, iph->ihl << 2, 0);

        return csum_fold(sum);
}

/**
 * csum_tcpudp_magic - compute IP pseudo-header checksum
 *
 * Compute the IPv4 pseudo header checksum. The helper can take a
 * accumulated sum from the transport layer to accumulate it and directly
 * return the transport layer
 *
 * @saddr: IP source address
 * @daddr: IP dest address
 * @len: IP data size
 * @proto: transport layer protocol
 * @csum: The accumulated partial sum to add to the computation
 *
 * Returns the folded sum
 */
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
                                        __u32 len, __u8 proto,
                                        __wsum csum)
{
        __u64 s = csum;

        s += (__u32)saddr;
        s += (__u32)daddr;
        s += htons(proto + len);
        s = (s & 0xffffffff) + (s >> 32);
        s = (s & 0xffffffff) + (s >> 32);

        return csum_fold((__u32)s);
}

/**
 * csum_ipv6_magic - compute IPv6 pseudo-header checksum
 *
 * Compute the ipv6 pseudo header checksum. The helper can take a
 * accumulated sum from the transport layer to accumulate it and directly
 * return the transport layer
 *
 * @saddr: IPv6 source address
 * @daddr: IPv6 dest address
 * @len: IPv6 data size
 * @proto: transport layer protocol
 * @csum: The accumulated partial sum to add to the computation
 *
 * Returns the folded sum
 */
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
                                      const struct in6_addr *daddr,
                                        __u32 len, __u8 proto,
                                        __wsum csum)
{
        __u64 s = csum;
        int i;

        for (i = 0; i < 4; i++)
                s += (__u32)saddr->s6_addr32[i];
        for (i = 0; i < 4; i++)
                s += (__u32)daddr->s6_addr32[i];
        s += htons(proto + len);
        s = (s & 0xffffffff) + (s >> 32);
        s = (s & 0xffffffff) + (s >> 32);

        return csum_fold((__u32)s);
}

/**
 * build_udp_v4_csum - compute UDP checksum for UDP over IPv4
 *
 * Compute the checksum to embed in UDP header, composed of the sum of IP
 * pseudo-header checksum, UDP header checksum and UDP data checksum
 * @iph IP header
 * @udph UDP header, which must be immediately followed by UDP data
 *
 * Returns the total checksum
 */

static inline __sum16 build_udp_v4_csum(const struct iphdr *iph,
                                        const struct udphdr *udph)
{
        unsigned long sum;

        sum = csum_partial(udph, ntohs(udph->len), 0);
        return csum_tcpudp_magic(iph->saddr, iph->daddr, ntohs(udph->len),
                                 IPPROTO_UDP, sum);
}

/**
 * build_udp_v6_csum - compute UDP checksum for UDP over IPv6
 *
 * Compute the checksum to embed in UDP header, composed of the sum of IPv6
 * pseudo-header checksum, UDP header checksum and UDP data checksum
 * @ip6h IPv6 header
 * @udph UDP header, which must be immediately followed by UDP data
 *
 * Returns the total checksum
 */
static inline __sum16 build_udp_v6_csum(const struct ipv6hdr *ip6h,
                                        const struct udphdr *udph)
{
        unsigned long sum;

        sum = csum_partial(udph, ntohs(udph->len), 0);
        return csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ntohs(udph->len),
                               IPPROTO_UDP, sum);
}

struct tmonitor_ctx;

typedef int (*tm_print_fn_t)(const char *format, va_list args);

/**
 * tc_prog_attach - attach BPF program(s) to an interface
 *
 * Takes file descriptors pointing to at least one, at most two BPF
 * programs, and attach those programs to an interface ingress, egress or
 * both.
 *
 * @dev: string containing the interface name
 * @ingress_fd: file descriptor of the program to attach to interface ingress
 * @egress_fd: file descriptor of the program to attach to interface egress
 *
 * Returns 0 on success, -1 if no valid file descriptor has been found, if
 * the interface name is invalid or if an error ocurred during attach.
 */
int tc_prog_attach(const char *dev, int ingress_fd, int egress_fd);

#ifdef TRAFFIC_MONITOR
struct tmonitor_ctx *traffic_monitor_start(const char *netns, const char *test_name,
                                           const char *subtest_name);
void traffic_monitor_stop(struct tmonitor_ctx *ctx);
tm_print_fn_t traffic_monitor_set_print(tm_print_fn_t fn);
#else
static inline struct tmonitor_ctx *traffic_monitor_start(const char *netns, const char *test_name,
                                                         const char *subtest_name)
{
        return NULL;
}

static inline void traffic_monitor_stop(struct tmonitor_ctx *ctx)
{
}

static inline tm_print_fn_t traffic_monitor_set_print(tm_print_fn_t fn)
{
        return NULL;
}
#endif

#endif