762 lines
18 KiB
C
762 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <net/ethernet.h>
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#include <netinet/ip.h>
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#include <netinet/ether.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <linux/virtio_net.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <os.h>
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#include <um_malloc.h>
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#include "vector_user.h"
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#define ID_GRE 0
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#define ID_L2TPV3 1
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#define ID_BESS 2
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#define ID_MAX 2
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#define TOKEN_IFNAME "ifname"
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#define TRANS_RAW "raw"
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#define TRANS_RAW_LEN strlen(TRANS_RAW)
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#define VNET_HDR_FAIL "could not enable vnet headers on fd %d"
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#define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s"
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#define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i"
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#define UNIX_BIND_FAIL "unix_open : could not bind socket err=%i"
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#define BPF_ATTACH_FAIL "Failed to attach filter size %d prog %px to %d, err %d\n"
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#define BPF_DETACH_FAIL "Failed to detach filter size %d prog %px to %d, err %d\n"
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#define MAX_UN_LEN 107
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/* This is very ugly and brute force lookup, but it is done
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* only once at initialization so not worth doing hashes or
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* anything more intelligent
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*/
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char *uml_vector_fetch_arg(struct arglist *ifspec, char *token)
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{
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int i;
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for (i = 0; i < ifspec->numargs; i++) {
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if (strcmp(ifspec->tokens[i], token) == 0)
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return ifspec->values[i];
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}
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return NULL;
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}
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struct arglist *uml_parse_vector_ifspec(char *arg)
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{
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struct arglist *result;
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int pos, len;
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bool parsing_token = true, next_starts = true;
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if (arg == NULL)
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return NULL;
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result = uml_kmalloc(sizeof(struct arglist), UM_GFP_KERNEL);
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if (result == NULL)
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return NULL;
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result->numargs = 0;
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len = strlen(arg);
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for (pos = 0; pos < len; pos++) {
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if (next_starts) {
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if (parsing_token) {
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result->tokens[result->numargs] = arg + pos;
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} else {
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result->values[result->numargs] = arg + pos;
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result->numargs++;
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}
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next_starts = false;
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}
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if (*(arg + pos) == '=') {
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if (parsing_token)
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parsing_token = false;
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else
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goto cleanup;
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next_starts = true;
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(*(arg + pos)) = '\0';
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}
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if (*(arg + pos) == ',') {
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parsing_token = true;
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next_starts = true;
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(*(arg + pos)) = '\0';
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}
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}
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return result;
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cleanup:
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printk(UM_KERN_ERR "vector_setup - Couldn't parse '%s'\n", arg);
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kfree(result);
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return NULL;
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}
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/*
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* Socket/FD configuration functions. These return an structure
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* of rx and tx descriptors to cover cases where these are not
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* the same (f.e. read via raw socket and write via tap).
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*/
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#define PATH_NET_TUN "/dev/net/tun"
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static int create_tap_fd(char *iface)
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{
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struct ifreq ifr;
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int fd = -1;
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int err = -ENOMEM, offload;
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fd = open(PATH_NET_TUN, O_RDWR);
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if (fd < 0) {
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printk(UM_KERN_ERR "uml_tap: failed to open tun device\n");
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goto tap_fd_cleanup;
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}
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
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strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
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err = ioctl(fd, TUNSETIFF, (void *) &ifr);
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if (err != 0) {
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printk(UM_KERN_ERR "uml_tap: failed to select tap interface\n");
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goto tap_fd_cleanup;
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}
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offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
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ioctl(fd, TUNSETOFFLOAD, offload);
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return fd;
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tap_fd_cleanup:
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if (fd >= 0)
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os_close_file(fd);
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return err;
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}
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static int create_raw_fd(char *iface, int flags, int proto)
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{
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struct ifreq ifr;
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int fd = -1;
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struct sockaddr_ll sock;
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int err = -ENOMEM;
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fd = socket(AF_PACKET, SOCK_RAW, flags);
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if (fd == -1) {
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err = -errno;
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goto raw_fd_cleanup;
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}
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memset(&ifr, 0, sizeof(ifr));
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strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
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if (ioctl(fd, SIOCGIFINDEX, (void *) &ifr) < 0) {
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err = -errno;
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goto raw_fd_cleanup;
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}
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sock.sll_family = AF_PACKET;
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sock.sll_protocol = htons(proto);
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sock.sll_ifindex = ifr.ifr_ifindex;
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if (bind(fd,
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(struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
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err = -errno;
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goto raw_fd_cleanup;
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}
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return fd;
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raw_fd_cleanup:
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printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
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if (fd >= 0)
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os_close_file(fd);
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return err;
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}
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static struct vector_fds *user_init_tap_fds(struct arglist *ifspec)
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{
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int fd = -1;
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char *iface;
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struct vector_fds *result = NULL;
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iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
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if (iface == NULL) {
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printk(UM_KERN_ERR "uml_tap: failed to parse interface spec\n");
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goto tap_cleanup;
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}
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result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
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if (result == NULL) {
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printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
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goto tap_cleanup;
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}
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result->rx_fd = -1;
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result->tx_fd = -1;
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result->remote_addr = NULL;
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result->remote_addr_size = 0;
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/* TAP */
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fd = create_tap_fd(iface);
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if (fd < 0) {
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printk(UM_KERN_ERR "uml_tap: failed to create tun interface\n");
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goto tap_cleanup;
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}
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result->tx_fd = fd;
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result->rx_fd = fd;
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return result;
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tap_cleanup:
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printk(UM_KERN_ERR "user_init_tap: init failed, error %d", fd);
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kfree(result);
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return NULL;
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}
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static struct vector_fds *user_init_hybrid_fds(struct arglist *ifspec)
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{
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char *iface;
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struct vector_fds *result = NULL;
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iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
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if (iface == NULL) {
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printk(UM_KERN_ERR "uml_tap: failed to parse interface spec\n");
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goto hybrid_cleanup;
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}
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result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
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if (result == NULL) {
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printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
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goto hybrid_cleanup;
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}
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result->rx_fd = -1;
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result->tx_fd = -1;
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result->remote_addr = NULL;
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result->remote_addr_size = 0;
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/* TAP */
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result->tx_fd = create_tap_fd(iface);
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if (result->tx_fd < 0) {
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printk(UM_KERN_ERR "uml_tap: failed to create tun interface: %i\n", result->tx_fd);
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goto hybrid_cleanup;
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}
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/* RAW */
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result->rx_fd = create_raw_fd(iface, ETH_P_ALL, ETH_P_ALL);
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if (result->rx_fd == -1) {
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printk(UM_KERN_ERR
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"uml_tap: failed to create paired raw socket: %i\n", result->rx_fd);
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goto hybrid_cleanup;
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}
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return result;
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hybrid_cleanup:
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printk(UM_KERN_ERR "user_init_hybrid: init failed");
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kfree(result);
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return NULL;
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}
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static struct vector_fds *user_init_unix_fds(struct arglist *ifspec, int id)
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{
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int fd = -1;
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int socktype;
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char *src, *dst;
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struct vector_fds *result = NULL;
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struct sockaddr_un *local_addr = NULL, *remote_addr = NULL;
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src = uml_vector_fetch_arg(ifspec, "src");
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dst = uml_vector_fetch_arg(ifspec, "dst");
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result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
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if (result == NULL) {
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printk(UM_KERN_ERR "unix open:cannot allocate remote addr");
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goto unix_cleanup;
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}
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remote_addr = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
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if (remote_addr == NULL) {
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printk(UM_KERN_ERR "unix open:cannot allocate remote addr");
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goto unix_cleanup;
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}
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switch (id) {
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case ID_BESS:
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socktype = SOCK_SEQPACKET;
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if ((src != NULL) && (strlen(src) <= MAX_UN_LEN)) {
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local_addr = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
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if (local_addr == NULL) {
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printk(UM_KERN_ERR "bess open:cannot allocate local addr");
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goto unix_cleanup;
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}
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local_addr->sun_family = AF_UNIX;
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memcpy(local_addr->sun_path, src, strlen(src) + 1);
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}
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if ((dst == NULL) || (strlen(dst) > MAX_UN_LEN))
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goto unix_cleanup;
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remote_addr->sun_family = AF_UNIX;
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memcpy(remote_addr->sun_path, dst, strlen(dst) + 1);
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break;
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default:
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printk(KERN_ERR "Unsupported unix socket type\n");
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return NULL;
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}
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fd = socket(AF_UNIX, socktype, 0);
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if (fd == -1) {
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printk(UM_KERN_ERR
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"unix open: could not open socket, error = %d",
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-errno
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);
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goto unix_cleanup;
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}
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if (local_addr != NULL) {
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if (bind(fd, (struct sockaddr *) local_addr, sizeof(struct sockaddr_un))) {
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printk(UM_KERN_ERR UNIX_BIND_FAIL, errno);
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goto unix_cleanup;
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}
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}
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switch (id) {
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case ID_BESS:
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if (connect(fd, remote_addr, sizeof(struct sockaddr_un)) < 0) {
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printk(UM_KERN_ERR "bess open:cannot connect to %s %i", remote_addr->sun_path, -errno);
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goto unix_cleanup;
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}
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break;
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}
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result->rx_fd = fd;
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result->tx_fd = fd;
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result->remote_addr_size = sizeof(struct sockaddr_un);
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result->remote_addr = remote_addr;
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return result;
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unix_cleanup:
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if (fd >= 0)
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os_close_file(fd);
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kfree(remote_addr);
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kfree(result);
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return NULL;
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}
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static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
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{
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int rxfd = -1, txfd = -1;
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int err = -ENOMEM;
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char *iface;
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struct vector_fds *result = NULL;
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iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
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if (iface == NULL)
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goto raw_cleanup;
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rxfd = create_raw_fd(iface, ETH_P_ALL, ETH_P_ALL);
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if (rxfd == -1) {
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err = -errno;
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goto raw_cleanup;
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}
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txfd = create_raw_fd(iface, 0, ETH_P_IP); /* Turn off RX on this fd */
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if (txfd == -1) {
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err = -errno;
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goto raw_cleanup;
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}
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result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
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if (result != NULL) {
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result->rx_fd = rxfd;
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result->tx_fd = txfd;
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result->remote_addr = NULL;
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result->remote_addr_size = 0;
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}
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return result;
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raw_cleanup:
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printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
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kfree(result);
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return NULL;
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}
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bool uml_raw_enable_qdisc_bypass(int fd)
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{
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int optval = 1;
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if (setsockopt(fd,
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SOL_PACKET, PACKET_QDISC_BYPASS,
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&optval, sizeof(optval)) != 0) {
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return false;
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}
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return true;
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}
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bool uml_raw_enable_vnet_headers(int fd)
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{
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int optval = 1;
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if (setsockopt(fd,
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SOL_PACKET, PACKET_VNET_HDR,
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&optval, sizeof(optval)) != 0) {
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printk(UM_KERN_INFO VNET_HDR_FAIL, fd);
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return false;
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}
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return true;
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}
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bool uml_tap_enable_vnet_headers(int fd)
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{
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unsigned int features;
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int len = sizeof(struct virtio_net_hdr);
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if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
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printk(UM_KERN_INFO TUN_GET_F_FAIL, strerror(errno));
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return false;
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}
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if ((features & IFF_VNET_HDR) == 0) {
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printk(UM_KERN_INFO "tapraw: No VNET HEADER support");
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return false;
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}
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ioctl(fd, TUNSETVNETHDRSZ, &len);
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return true;
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}
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static struct vector_fds *user_init_socket_fds(struct arglist *ifspec, int id)
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{
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int err = -ENOMEM;
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int fd = -1, gairet;
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struct addrinfo srchints;
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struct addrinfo dsthints;
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bool v6, udp;
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char *value;
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char *src, *dst, *srcport, *dstport;
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struct addrinfo *gairesult = NULL;
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struct vector_fds *result = NULL;
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value = uml_vector_fetch_arg(ifspec, "v6");
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v6 = false;
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udp = false;
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if (value != NULL) {
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if (strtol((const char *) value, NULL, 10) > 0)
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v6 = true;
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}
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value = uml_vector_fetch_arg(ifspec, "udp");
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if (value != NULL) {
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if (strtol((const char *) value, NULL, 10) > 0)
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udp = true;
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}
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src = uml_vector_fetch_arg(ifspec, "src");
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dst = uml_vector_fetch_arg(ifspec, "dst");
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srcport = uml_vector_fetch_arg(ifspec, "srcport");
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dstport = uml_vector_fetch_arg(ifspec, "dstport");
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memset(&dsthints, 0, sizeof(dsthints));
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if (v6)
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dsthints.ai_family = AF_INET6;
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else
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dsthints.ai_family = AF_INET;
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switch (id) {
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case ID_GRE:
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dsthints.ai_socktype = SOCK_RAW;
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dsthints.ai_protocol = IPPROTO_GRE;
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break;
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case ID_L2TPV3:
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if (udp) {
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dsthints.ai_socktype = SOCK_DGRAM;
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dsthints.ai_protocol = 0;
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} else {
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dsthints.ai_socktype = SOCK_RAW;
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dsthints.ai_protocol = IPPROTO_L2TP;
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}
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break;
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default:
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printk(KERN_ERR "Unsupported socket type\n");
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return NULL;
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}
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memcpy(&srchints, &dsthints, sizeof(struct addrinfo));
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gairet = getaddrinfo(src, srcport, &dsthints, &gairesult);
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if ((gairet != 0) || (gairesult == NULL)) {
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printk(UM_KERN_ERR
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"socket_open : could not resolve src, error = %s",
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gai_strerror(gairet)
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);
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return NULL;
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}
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fd = socket(gairesult->ai_family,
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gairesult->ai_socktype, gairesult->ai_protocol);
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if (fd == -1) {
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printk(UM_KERN_ERR
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"socket_open : could not open socket, error = %d",
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-errno
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);
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goto cleanup;
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}
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if (bind(fd,
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(struct sockaddr *) gairesult->ai_addr,
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gairesult->ai_addrlen)) {
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printk(UM_KERN_ERR L2TPV3_BIND_FAIL, errno);
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goto cleanup;
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}
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if (gairesult != NULL)
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freeaddrinfo(gairesult);
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|
|
|
gairesult = NULL;
|
|
|
|
gairet = getaddrinfo(dst, dstport, &dsthints, &gairesult);
|
|
if ((gairet != 0) || (gairesult == NULL)) {
|
|
printk(UM_KERN_ERR
|
|
"socket_open : could not resolve dst, error = %s",
|
|
gai_strerror(gairet)
|
|
);
|
|
return NULL;
|
|
}
|
|
|
|
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
|
|
if (result != NULL) {
|
|
result->rx_fd = fd;
|
|
result->tx_fd = fd;
|
|
result->remote_addr = uml_kmalloc(
|
|
gairesult->ai_addrlen, UM_GFP_KERNEL);
|
|
if (result->remote_addr == NULL)
|
|
goto cleanup;
|
|
result->remote_addr_size = gairesult->ai_addrlen;
|
|
memcpy(
|
|
result->remote_addr,
|
|
gairesult->ai_addr,
|
|
gairesult->ai_addrlen
|
|
);
|
|
}
|
|
freeaddrinfo(gairesult);
|
|
return result;
|
|
cleanup:
|
|
if (gairesult != NULL)
|
|
freeaddrinfo(gairesult);
|
|
printk(UM_KERN_ERR "user_init_socket: init failed, error %d", err);
|
|
if (fd >= 0)
|
|
os_close_file(fd);
|
|
if (result != NULL) {
|
|
kfree(result->remote_addr);
|
|
kfree(result);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct vector_fds *uml_vector_user_open(
|
|
int unit,
|
|
struct arglist *parsed
|
|
)
|
|
{
|
|
char *transport;
|
|
|
|
if (parsed == NULL) {
|
|
printk(UM_KERN_ERR "no parsed config for unit %d\n", unit);
|
|
return NULL;
|
|
}
|
|
transport = uml_vector_fetch_arg(parsed, "transport");
|
|
if (transport == NULL) {
|
|
printk(UM_KERN_ERR "missing transport for unit %d\n", unit);
|
|
return NULL;
|
|
}
|
|
if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
|
|
return user_init_raw_fds(parsed);
|
|
if (strncmp(transport, TRANS_HYBRID, TRANS_HYBRID_LEN) == 0)
|
|
return user_init_hybrid_fds(parsed);
|
|
if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
|
|
return user_init_tap_fds(parsed);
|
|
if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
|
|
return user_init_socket_fds(parsed, ID_GRE);
|
|
if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
|
|
return user_init_socket_fds(parsed, ID_L2TPV3);
|
|
if (strncmp(transport, TRANS_BESS, TRANS_BESS_LEN) == 0)
|
|
return user_init_unix_fds(parsed, ID_BESS);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
int uml_vector_sendmsg(int fd, void *hdr, int flags)
|
|
{
|
|
int n;
|
|
|
|
CATCH_EINTR(n = sendmsg(fd, (struct msghdr *) hdr, flags));
|
|
if ((n < 0) && (errno == EAGAIN))
|
|
return 0;
|
|
if (n >= 0)
|
|
return n;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
int uml_vector_recvmsg(int fd, void *hdr, int flags)
|
|
{
|
|
int n;
|
|
struct msghdr *msg = (struct msghdr *) hdr;
|
|
|
|
CATCH_EINTR(n = readv(fd, msg->msg_iov, msg->msg_iovlen));
|
|
if ((n < 0) && (errno == EAGAIN))
|
|
return 0;
|
|
if (n >= 0)
|
|
return n;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
int uml_vector_writev(int fd, void *hdr, int iovcount)
|
|
{
|
|
int n;
|
|
|
|
CATCH_EINTR(n = writev(fd, (struct iovec *) hdr, iovcount));
|
|
if ((n < 0) && ((errno == EAGAIN) || (errno == ENOBUFS)))
|
|
return 0;
|
|
if (n >= 0)
|
|
return n;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
int uml_vector_sendmmsg(
|
|
int fd,
|
|
void *msgvec,
|
|
unsigned int vlen,
|
|
unsigned int flags)
|
|
{
|
|
int n;
|
|
|
|
CATCH_EINTR(n = sendmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags));
|
|
if ((n < 0) && ((errno == EAGAIN) || (errno == ENOBUFS)))
|
|
return 0;
|
|
if (n >= 0)
|
|
return n;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
int uml_vector_recvmmsg(
|
|
int fd,
|
|
void *msgvec,
|
|
unsigned int vlen,
|
|
unsigned int flags)
|
|
{
|
|
int n;
|
|
|
|
CATCH_EINTR(
|
|
n = recvmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags, 0));
|
|
if ((n < 0) && (errno == EAGAIN))
|
|
return 0;
|
|
if (n >= 0)
|
|
return n;
|
|
else
|
|
return -errno;
|
|
}
|
|
int uml_vector_attach_bpf(int fd, void *bpf)
|
|
{
|
|
struct sock_fprog *prog = bpf;
|
|
|
|
int err = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, bpf, sizeof(struct sock_fprog));
|
|
|
|
if (err < 0)
|
|
printk(KERN_ERR BPF_ATTACH_FAIL, prog->len, prog->filter, fd, -errno);
|
|
return err;
|
|
}
|
|
|
|
int uml_vector_detach_bpf(int fd, void *bpf)
|
|
{
|
|
struct sock_fprog *prog = bpf;
|
|
|
|
int err = setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, bpf, sizeof(struct sock_fprog));
|
|
if (err < 0)
|
|
printk(KERN_ERR BPF_DETACH_FAIL, prog->len, prog->filter, fd, -errno);
|
|
return err;
|
|
}
|
|
void *uml_vector_default_bpf(void *mac)
|
|
{
|
|
struct sock_filter *bpf;
|
|
uint32_t *mac1 = (uint32_t *)(mac + 2);
|
|
uint16_t *mac2 = (uint16_t *) mac;
|
|
struct sock_fprog *bpf_prog;
|
|
|
|
bpf_prog = uml_kmalloc(sizeof(struct sock_fprog), UM_GFP_KERNEL);
|
|
if (bpf_prog) {
|
|
bpf_prog->len = DEFAULT_BPF_LEN;
|
|
bpf_prog->filter = NULL;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
bpf = uml_kmalloc(
|
|
sizeof(struct sock_filter) * DEFAULT_BPF_LEN, UM_GFP_KERNEL);
|
|
if (bpf) {
|
|
bpf_prog->filter = bpf;
|
|
/* ld [8] */
|
|
bpf[0] = (struct sock_filter){ 0x20, 0, 0, 0x00000008 };
|
|
/* jeq #0xMAC[2-6] jt 2 jf 5*/
|
|
bpf[1] = (struct sock_filter){ 0x15, 0, 3, ntohl(*mac1)};
|
|
/* ldh [6] */
|
|
bpf[2] = (struct sock_filter){ 0x28, 0, 0, 0x00000006 };
|
|
/* jeq #0xMAC[0-1] jt 4 jf 5 */
|
|
bpf[3] = (struct sock_filter){ 0x15, 0, 1, ntohs(*mac2)};
|
|
/* ret #0 */
|
|
bpf[4] = (struct sock_filter){ 0x6, 0, 0, 0x00000000 };
|
|
/* ret #0x40000 */
|
|
bpf[5] = (struct sock_filter){ 0x6, 0, 0, 0x00040000 };
|
|
} else {
|
|
kfree(bpf_prog);
|
|
bpf_prog = NULL;
|
|
}
|
|
return bpf_prog;
|
|
}
|
|
|
|
/* Note - this function requires a valid mac being passed as an arg */
|
|
|
|
void *uml_vector_user_bpf(char *filename)
|
|
{
|
|
struct sock_filter *bpf;
|
|
struct sock_fprog *bpf_prog;
|
|
struct stat statbuf;
|
|
int res, ffd = -1;
|
|
|
|
if (filename == NULL)
|
|
return NULL;
|
|
|
|
if (stat(filename, &statbuf) < 0) {
|
|
printk(KERN_ERR "Error %d reading bpf file", -errno);
|
|
return false;
|
|
}
|
|
bpf_prog = uml_kmalloc(sizeof(struct sock_fprog), UM_GFP_KERNEL);
|
|
if (bpf_prog != NULL) {
|
|
bpf_prog->len = statbuf.st_size / sizeof(struct sock_filter);
|
|
bpf_prog->filter = NULL;
|
|
}
|
|
ffd = os_open_file(filename, of_read(OPENFLAGS()), 0);
|
|
if (ffd < 0) {
|
|
printk(KERN_ERR "Error %d opening bpf file", -errno);
|
|
goto bpf_failed;
|
|
}
|
|
bpf = uml_kmalloc(statbuf.st_size, UM_GFP_KERNEL);
|
|
if (bpf == NULL) {
|
|
printk(KERN_ERR "Failed to allocate bpf buffer");
|
|
goto bpf_failed;
|
|
}
|
|
bpf_prog->filter = bpf;
|
|
res = os_read_file(ffd, bpf, statbuf.st_size);
|
|
if (res < statbuf.st_size) {
|
|
printk(KERN_ERR "Failed to read bpf program %s, error %d", filename, res);
|
|
kfree(bpf);
|
|
goto bpf_failed;
|
|
}
|
|
os_close_file(ffd);
|
|
return bpf_prog;
|
|
bpf_failed:
|
|
if (ffd > 0)
|
|
os_close_file(ffd);
|
|
kfree(bpf_prog);
|
|
return NULL;
|
|
}
|