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#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdarg.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <linux/if_tun.h>
#include <signal.h>
#include <assert.h>
#if (SUPPORT_BPF)
#include "../../bpf/bpf_conf_user.h"
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#endif
#include "kni_tap_rss.h"
#include "kni_utils.h"
#ifndef TUN_PATH
#define TUN_PATH "/dev/net/tun"
#endif
struct bpf_ctx
{
int bpf_prog_fd;
int bpf_map_fd;
char bpf_file[1024];
#if (SUPPORT_BPF)
struct bpf_object *bpf_obj;
bpf_conf_t bpf_conf;
#endif
};
int kni_tap_get_bpf_prog_fd(struct bpf_ctx *ctx)
{
if (ctx)
{
return ctx->bpf_prog_fd;
}
else
{
return -1;
}
}
#if (SUPPORT_BPF)
void kni_tap_global_unload_rss_bpf(struct bpf_ctx *ctx)
{
if (ctx)
{
if (ctx->bpf_prog_fd > 0)
{
close(ctx->bpf_prog_fd);
}
if (ctx->bpf_obj)
{
bpf_object__close(ctx->bpf_obj);
ctx->bpf_obj = NULL;
}
free(ctx);
ctx = NULL;
}
}
#else
void kni_tap_global_unload_rss_bpf(struct bpf_ctx *ctx)
{
}
#endif
/*
* bpf_queue_num : worker thread number
* bpf_default_queue : -1: for disable(only use for debug, rss to one queue)
* bpf_hash_mode : 2: hash with src/dst addr
* 4: hash with src/dst addr and src/dst port
* bpf_debug_log : 0 for disable(only use for debug, printf bpf debug log)
*/
#if (SUPPORT_BPF)
struct bpf_ctx *kni_tap_global_load_rss_bpf(const char *bpf_obj_file, uint32_t bpf_queue_num, uint32_t bpf_hash_mode, uint32_t bpf_debug_log, void *logger)
{
struct bpf_ctx *ctx = (struct bpf_ctx *)calloc(1, sizeof(struct bpf_ctx));
strncpy(ctx->bpf_file, bpf_obj_file, strlen(bpf_obj_file));
bpf_conf_set_debug_log(&ctx->bpf_conf, bpf_debug_log);
bpf_conf_set_hash_mode(&ctx->bpf_conf, bpf_hash_mode);
bpf_conf_set_queue_num(&ctx->bpf_conf, bpf_queue_num);
if (bpf_prog_load(ctx->bpf_file, BPF_PROG_TYPE_SOCKET_FILTER, &ctx->bpf_obj, &ctx->bpf_prog_fd) < 0)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to load bpf object %s, aborting: %s", ctx->bpf_file, strerror(errno));
goto error;
}
if (bpf_conf_update_map(&ctx->bpf_conf, ctx->bpf_obj) == -1)
{
goto error;
}
return ctx;
error:
kni_tap_global_unload_rss_bpf(ctx);
return NULL;
}
#else
struct bpf_ctx *kni_tap_global_load_rss_bpf(const char *bpf_obj_file, uint32_t bpf_queue_num, uint32_t bpf_hash_mode, uint32_t bpf_debug_log, void *logger)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "not support bpf");
return NULL;
}
#endif
int kni_tap_open_per_thread(const char *tap_dev, int tap_flags, int bpf_prog_fd, void *logger)
{
int fd = -1;
int tap_fd = -1;
int nonblock_flags = -1;
struct ifreq ifr;
tap_fd = open(TUN_PATH, O_RDWR);
if (tap_fd == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to open " TUN_PATH ", aborting: %s", strerror(errno));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = tap_flags;
strcpy(ifr.ifr_name, tap_dev);
if (ioctl(tap_fd, TUNSETIFF, &ifr) == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to attach %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
/*
* The TUNSETPERSIST ioctl can be used to make the TUN/TAP interface persistent.
* In this mode, the interface won't be destroyed when the last process closes the associated /dev/net/tun file descriptor.
*/
/*
if (ioctl(tap_fd, TUNSETPERSIST, 1) == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to set persist on %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
*/
#if (SUPPORT_BPF)
if (bpf_prog_fd > 0)
{
// Set bpf
if (ioctl(tap_fd, TUNSETSTEERINGEBPF, (void *)&bpf_prog_fd) == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to set bpf on %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
}
#endif
// Set nonblock
nonblock_flags = fcntl(tap_fd, F_GETFL);
if (nonblock_flags == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to get nonblock flags on %s fd, aborting: %s", tap_dev, strerror(errno));
goto error;
}
nonblock_flags |= O_NONBLOCK;
if (fcntl(tap_fd, F_SETFL, nonblock_flags) == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to set nonblock flags on %s fd, aborting: %s", tap_dev, strerror(errno));
goto error;
}
// Get MTU
fd = socket(PF_INET, SOCK_DGRAM, 0);
if (fd == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to create socket, aborting: %s", strerror(errno));
goto error;
}
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, tap_dev);
if (ioctl(fd, SIOCGIFMTU, &ifr) < 0)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to get MTU on %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
// Set eth up
if (ioctl(fd, SIOCGIFFLAGS, &ifr) == -1)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to get link status on %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
if ((ifr.ifr_flags & IFF_UP) == 0)
{
ifr.ifr_flags |= IFF_UP;
if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to set link status on %s, aborting: %s", tap_dev, strerror(errno));
goto error;
}
}
KNI_LOG_INFO(logger, TAP_RSS_LOG_TAG "using tap device %s with MTU %d", tap_dev, ifr.ifr_mtu);
close(fd);
return tap_fd;
error:
if (fd > 0)
{
close(fd);
fd = -1;
}
if (tap_fd > 0)
{
close(tap_fd);
tap_fd = -1;
}
return -1;
}
void kni_tap_close_per_thread(int tap_fd)
{
if (tap_fd > 0)
{
close(tap_fd);
}
}
int kni_tap_read_per_thread(int tap_fd, char *buff, int buff_size, void *logger)
{
int ret = read(tap_fd, buff, buff_size);
if (ret < 0)
{
if (errno != EWOULDBLOCK && errno != EAGAIN)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "unable to read data from tapfd %d, aborting: %s", tap_fd, strerror(errno));
}
}
return ret;
}
int kni_tap_write_per_thread(int tap_fd, const char *data, int data_len, void *logger)
{
int ret = write(tap_fd, data, data_len);
if (ret != data_len)
{
KNI_LOG_ERROR(logger, TAP_RSS_LOG_TAG "need send %dB, only send %dB, aborting: %s", data_len, ret, strerror(errno));
}
return ret;
}
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