#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/ip.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <linux/virtio_net.h>
#include <netdb.h>
#include <stdlib.h>
#include <os.h>
#include <limits.h>
#include <um_malloc.h>
#include "vector_user.h"
#define ID_GRE 0
#define ID_L2TPV3 1
#define ID_BESS 2
#define ID_MAX 2
#define TOKEN_IFNAME "ifname"
#define TOKEN_SCRIPT "ifup"
#define TRANS_RAW "raw"
#define TRANS_RAW_LEN strlen(TRANS_RAW)
#define TRANS_FD "fd"
#define TRANS_FD_LEN strlen(TRANS_FD)
#define TRANS_VDE "vde"
#define TRANS_VDE_LEN strlen(TRANS_VDE)
#define VNET_HDR_FAIL "could not enable vnet headers on fd %d"
#define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s"
#define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i"
#define UNIX_BIND_FAIL "unix_open : could not bind socket err=%i"
#define BPF_ATTACH_FAIL "Failed to attach filter size %d prog %px to %d, err %d\n"
#define BPF_DETACH_FAIL "Failed to detach filter size %d prog %px to %d, err %d\n"
#define MAX_UN_LEN 107
static const char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static const char *template = "tapXXXXXX";
char *uml_vector_fetch_arg(struct arglist *ifspec, char *token)
{
int i;
for (i = 0; i < ifspec->numargs; i++) {
if (strcmp(ifspec->tokens[i], token) == 0)
return ifspec->values[i];
}
return NULL;
}
struct arglist *uml_parse_vector_ifspec(char *arg)
{
struct arglist *result;
int pos, len;
bool parsing_token = true, next_starts = true;
if (arg == NULL)
return NULL;
result = uml_kmalloc(sizeof(struct arglist), UM_GFP_KERNEL);
if (result == NULL)
return NULL;
result->numargs = 0;
len = strlen(arg);
for (pos = 0; pos < len; pos++) {
if (next_starts) {
if (parsing_token) {
result->tokens[result->numargs] = arg + pos;
} else {
result->values[result->numargs] = arg + pos;
result->numargs++;
}
next_starts = false;
}
if (*(arg + pos) == '=') {
if (parsing_token)
parsing_token = false;
else
goto cleanup;
next_starts = true;
(*(arg + pos)) = '\0';
}
if (*(arg + pos) == ',') {
parsing_token = true;
next_starts = true;
(*(arg + pos)) = '\0';
}
}
return result;
cleanup:
printk(UM_KERN_ERR "vector_setup - Couldn't parse '%s'\n", arg);
kfree(result);
return NULL;
}
#define PATH_NET_TUN "/dev/net/tun"
static int create_tap_fd(char *iface)
{
struct ifreq ifr;
int fd = -1;
int err = -ENOMEM, offload;
fd = open(PATH_NET_TUN, O_RDWR);
if (fd < 0) {
printk(UM_KERN_ERR "uml_tap: failed to open tun device\n");
goto tap_fd_cleanup;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
strscpy(ifr.ifr_name, iface);
err = ioctl(fd, TUNSETIFF, (void *) &ifr);
if (err != 0) {
printk(UM_KERN_ERR "uml_tap: failed to select tap interface\n");
goto tap_fd_cleanup;
}
offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
ioctl(fd, TUNSETOFFLOAD, offload);
return fd;
tap_fd_cleanup:
if (fd >= 0)
os_close_file(fd);
return err;
}
static int create_raw_fd(char *iface, int flags, int proto)
{
struct ifreq ifr;
int fd = -1;
struct sockaddr_ll sock;
int err = -ENOMEM;
fd = socket(AF_PACKET, SOCK_RAW, flags);
if (fd == -1) {
err = -errno;
goto raw_fd_cleanup;
}
memset(&ifr, 0, sizeof(ifr));
strscpy(ifr.ifr_name, iface);
if (ioctl(fd, SIOCGIFINDEX, (void *) &ifr) < 0) {
err = -errno;
goto raw_fd_cleanup;
}
sock.sll_family = AF_PACKET;
sock.sll_protocol = htons(proto);
sock.sll_ifindex = ifr.ifr_ifindex;
if (bind(fd,
(struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
err = -errno;
goto raw_fd_cleanup;
}
return fd;
raw_fd_cleanup:
printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
if (fd >= 0)
os_close_file(fd);
return err;
}
static struct vector_fds *user_init_tap_fds(struct arglist *ifspec)
{
int fd = -1, i;
char *iface;
struct vector_fds *result = NULL;
bool dynamic = false;
char dynamic_ifname[IFNAMSIZ];
char *argv[] = {NULL, NULL, NULL, NULL};
iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
if (iface == NULL) {
dynamic = true;
iface = dynamic_ifname;
srand(getpid());
}
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result == NULL) {
printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
goto tap_cleanup;
}
result->rx_fd = -1;
result->tx_fd = -1;
result->remote_addr = NULL;
result->remote_addr_size = 0;
do {
if (dynamic) {
strcpy(iface, template);
for (i = 0; i < strlen(iface); i++) {
if (iface[i] == 'X') {
iface[i] = padchar[rand() % strlen(padchar)];
}
}
}
fd = create_tap_fd(iface);
if ((fd < 0) && (!dynamic)) {
printk(UM_KERN_ERR "uml_tap: failed to create tun interface\n");
goto tap_cleanup;
}
result->tx_fd = fd;
result->rx_fd = fd;
} while (fd < 0);
argv[0] = uml_vector_fetch_arg(ifspec, TOKEN_SCRIPT);
if (argv[0]) {
argv[1] = iface;
run_helper(NULL, NULL, argv);
}
return result;
tap_cleanup:
printk(UM_KERN_ERR "user_init_tap: init failed, error %d", fd);
kfree(result);
return NULL;
}
static struct vector_fds *user_init_hybrid_fds(struct arglist *ifspec)
{
char *iface;
struct vector_fds *result = NULL;
char *argv[] = {NULL, NULL, NULL, NULL};
iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
if (iface == NULL) {
printk(UM_KERN_ERR "uml_tap: failed to parse interface spec\n");
goto hybrid_cleanup;
}
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result == NULL) {
printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
goto hybrid_cleanup;
}
result->rx_fd = -1;
result->tx_fd = -1;
result->remote_addr = NULL;
result->remote_addr_size = 0;
result->tx_fd = create_tap_fd(iface);
if (result->tx_fd < 0) {
printk(UM_KERN_ERR "uml_tap: failed to create tun interface: %i\n", result->tx_fd);
goto hybrid_cleanup;
}
result->rx_fd = create_raw_fd(iface, ETH_P_ALL, ETH_P_ALL);
if (result->rx_fd == -1) {
printk(UM_KERN_ERR
"uml_tap: failed to create paired raw socket: %i\n", result->rx_fd);
goto hybrid_cleanup;
}
argv[0] = uml_vector_fetch_arg(ifspec, TOKEN_SCRIPT);
if (argv[0]) {
argv[1] = iface;
run_helper(NULL, NULL, argv);
}
return result;
hybrid_cleanup:
printk(UM_KERN_ERR "user_init_hybrid: init failed");
kfree(result);
return NULL;
}
static struct vector_fds *user_init_unix_fds(struct arglist *ifspec, int id)
{
int fd = -1;
int socktype;
char *src, *dst;
struct vector_fds *result = NULL;
struct sockaddr_un *local_addr = NULL, *remote_addr = NULL;
src = uml_vector_fetch_arg(ifspec, "src");
dst = uml_vector_fetch_arg(ifspec, "dst");
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result == NULL) {
printk(UM_KERN_ERR "unix open:cannot allocate remote addr");
goto unix_cleanup;
}
remote_addr = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
if (remote_addr == NULL) {
printk(UM_KERN_ERR "unix open:cannot allocate remote addr");
goto unix_cleanup;
}
switch (id) {
case ID_BESS:
socktype = SOCK_SEQPACKET;
if ((src != NULL) && (strlen(src) <= MAX_UN_LEN)) {
local_addr = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
if (local_addr == NULL) {
printk(UM_KERN_ERR "bess open:cannot allocate local addr");
goto unix_cleanup;
}
local_addr->sun_family = AF_UNIX;
memcpy(local_addr->sun_path, src, strlen(src) + 1);
}
if ((dst == NULL) || (strlen(dst) > MAX_UN_LEN))
goto unix_cleanup;
remote_addr->sun_family = AF_UNIX;
memcpy(remote_addr->sun_path, dst, strlen(dst) + 1);
break;
default:
printk(KERN_ERR "Unsupported unix socket type\n");
return NULL;
}
fd = socket(AF_UNIX, socktype, 0);
if (fd == -1) {
printk(UM_KERN_ERR
"unix open: could not open socket, error = %d",
-errno
);
goto unix_cleanup;
}
if (local_addr != NULL) {
if (bind(fd, (struct sockaddr *) local_addr, sizeof(struct sockaddr_un))) {
printk(UM_KERN_ERR UNIX_BIND_FAIL, errno);
goto unix_cleanup;
}
}
switch (id) {
case ID_BESS:
if (connect(fd, (const struct sockaddr *) remote_addr, sizeof(struct sockaddr_un)) < 0) {
printk(UM_KERN_ERR "bess open:cannot connect to %s %i", remote_addr->sun_path, -errno);
goto unix_cleanup;
}
break;
}
result->rx_fd = fd;
result->tx_fd = fd;
result->remote_addr_size = sizeof(struct sockaddr_un);
result->remote_addr = remote_addr;
return result;
unix_cleanup:
if (fd >= 0)
os_close_file(fd);
kfree(remote_addr);
kfree(result);
return NULL;
}
static int strtofd(const char *nptr)
{
long fd;
char *endptr;
if (nptr == NULL)
return -1;
errno = 0;
fd = strtol(nptr, &endptr, 10);
if (nptr == endptr ||
errno != 0 ||
*endptr != '\0' ||
fd < 0 ||
fd > INT_MAX) {
return -1;
}
return fd;
}
static struct vector_fds *user_init_fd_fds(struct arglist *ifspec)
{
int fd = -1;
char *fdarg = NULL;
struct vector_fds *result = NULL;
fdarg = uml_vector_fetch_arg(ifspec, "fd");
fd = strtofd(fdarg);
if (fd == -1) {
printk(UM_KERN_ERR "fd open: bad or missing fd argument");
goto fd_cleanup;
}
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result == NULL) {
printk(UM_KERN_ERR "fd open: allocation failed");
goto fd_cleanup;
}
result->rx_fd = fd;
result->tx_fd = fd;
result->remote_addr_size = 0;
result->remote_addr = NULL;
return result;
fd_cleanup:
if (fd >= 0)
os_close_file(fd);
kfree(result);
return NULL;
}
#define ENOUGH(type) ((CHAR_BIT * sizeof(type) - 1) / 3 + 2)
#define ENOUGH_OCTAL(type) ((CHAR_BIT * sizeof(type) + 2) / 3)
#define VDE_MAX_ARGC 12
#define VDE_SEQPACKET_HEAD "seqpacket://"
#define VDE_SEQPACKET_HEAD_LEN (sizeof(VDE_SEQPACKET_HEAD) - 1)
#define VDE_DEFAULT_DESCRIPTION "UML"
static struct vector_fds *user_init_vde_fds(struct arglist *ifspec)
{
char seqpacketvnl[VDE_SEQPACKET_HEAD_LEN + ENOUGH(int) + 1];
char *argv[VDE_MAX_ARGC] = {"vde_plug"};
int argc = 1;
int rv;
int sv[2];
struct vector_fds *result = NULL;
char *vnl = uml_vector_fetch_arg(ifspec,"vnl");
char *descr = uml_vector_fetch_arg(ifspec,"descr");
char *port = uml_vector_fetch_arg(ifspec,"port");
char *mode = uml_vector_fetch_arg(ifspec,"mode");
char *group = uml_vector_fetch_arg(ifspec,"group");
if (descr == NULL) descr = VDE_DEFAULT_DESCRIPTION;
argv[argc++] = "--descr";
argv[argc++] = descr;
if (port != NULL) {
argv[argc++] = "--port2";
argv[argc++] = port;
}
if (mode != NULL) {
argv[argc++] = "--mod2";
argv[argc++] = mode;
}
if (group != NULL) {
argv[argc++] = "--group2";
argv[argc++] = group;
}
argv[argc++] = seqpacketvnl;
argv[argc++] = vnl;
argv[argc++] = NULL;
rv = socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sv);
if (rv < 0) {
printk(UM_KERN_ERR "vde: seqpacket socketpair err %d", -errno);
return NULL;
}
rv = os_set_exec_close(sv[0]);
if (rv < 0) {
printk(UM_KERN_ERR "vde: seqpacket socketpair cloexec err %d", -errno);
goto vde_cleanup_sv;
}
snprintf(seqpacketvnl, sizeof(seqpacketvnl), VDE_SEQPACKET_HEAD "%d", sv[1]);
run_helper(NULL, NULL, argv);
close(sv[1]);
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result == NULL) {
printk(UM_KERN_ERR "fd open: allocation failed");
goto vde_cleanup;
}
result->rx_fd = sv[0];
result->tx_fd = sv[0];
result->remote_addr_size = 0;
result->remote_addr = NULL;
return result;
vde_cleanup_sv:
close(sv[1]);
vde_cleanup:
close(sv[0]);
return NULL;
}
static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
{
int rxfd = -1, txfd = -1;
int err = -ENOMEM;
char *iface;
struct vector_fds *result = NULL;
char *argv[] = {NULL, NULL, NULL, NULL};
iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
if (iface == NULL)
goto raw_cleanup;
rxfd = create_raw_fd(iface, ETH_P_ALL, ETH_P_ALL);
if (rxfd == -1) {
err = -errno;
goto raw_cleanup;
}
txfd = create_raw_fd(iface, 0, ETH_P_IP);
if (txfd == -1) {
err = -errno;
goto raw_cleanup;
}
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result != NULL) {
result->rx_fd = rxfd;
result->tx_fd = txfd;
result->remote_addr = NULL;
result->remote_addr_size = 0;
}
argv[0] = uml_vector_fetch_arg(ifspec, TOKEN_SCRIPT);
if (argv[0]) {
argv[1] = iface;
run_helper(NULL, NULL, argv);
}
return result;
raw_cleanup:
printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
kfree(result);
return NULL;
}
bool uml_raw_enable_qdisc_bypass(int fd)
{
int optval = 1;
if (setsockopt(fd,
SOL_PACKET, PACKET_QDISC_BYPASS,
&optval, sizeof(optval)) != 0) {
return false;
}
return true;
}
bool uml_raw_enable_vnet_headers(int fd)
{
int optval = 1;
if (setsockopt(fd,
SOL_PACKET, PACKET_VNET_HDR,
&optval, sizeof(optval)) != 0) {
printk(UM_KERN_INFO VNET_HDR_FAIL, fd);
return false;
}
return true;
}
bool uml_tap_enable_vnet_headers(int fd)
{
unsigned int features;
int len = sizeof(struct virtio_net_hdr);
if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
printk(UM_KERN_INFO TUN_GET_F_FAIL, strerror(errno));
return false;
}
if ((features & IFF_VNET_HDR) == 0) {
printk(UM_KERN_INFO "tapraw: No VNET HEADER support");
return false;
}
ioctl(fd, TUNSETVNETHDRSZ, &len);
return true;
}
static struct vector_fds *user_init_socket_fds(struct arglist *ifspec, int id)
{
int err = -ENOMEM;
int fd = -1, gairet;
struct addrinfo srchints;
struct addrinfo dsthints;
bool v6, udp;
char *value;
char *src, *dst, *srcport, *dstport;
struct addrinfo *gairesult = NULL;
struct vector_fds *result = NULL;
value = uml_vector_fetch_arg(ifspec, "v6");
v6 = false;
udp = false;
if (value != NULL) {
if (strtol((const char *) value, NULL, 10) > 0)
v6 = true;
}
value = uml_vector_fetch_arg(ifspec, "udp");
if (value != NULL) {
if (strtol((const char *) value, NULL, 10) > 0)
udp = true;
}
src = uml_vector_fetch_arg(ifspec, "src");
dst = uml_vector_fetch_arg(ifspec, "dst");
srcport = uml_vector_fetch_arg(ifspec, "srcport");
dstport = uml_vector_fetch_arg(ifspec, "dstport");
memset(&dsthints, 0, sizeof(dsthints));
if (v6)
dsthints.ai_family = AF_INET6;
else
dsthints.ai_family = AF_INET;
switch (id) {
case ID_GRE:
dsthints.ai_socktype = SOCK_RAW;
dsthints.ai_protocol = IPPROTO_GRE;
break;
case ID_L2TPV3:
if (udp) {
dsthints.ai_socktype = SOCK_DGRAM;
dsthints.ai_protocol = 0;
} else {
dsthints.ai_socktype = SOCK_RAW;
dsthints.ai_protocol = IPPROTO_L2TP;
}
break;
default:
printk(KERN_ERR "Unsupported socket type\n");
return NULL;
}
memcpy(&srchints, &dsthints, sizeof(struct addrinfo));
gairet = getaddrinfo(src, srcport, &dsthints, &gairesult);
if ((gairet != 0) || (gairesult == NULL)) {
printk(UM_KERN_ERR
"socket_open : could not resolve src, error = %s",
gai_strerror(gairet)
);
return NULL;
}
fd = socket(gairesult->ai_family,
gairesult->ai_socktype, gairesult->ai_protocol);
if (fd == -1) {
printk(UM_KERN_ERR
"socket_open : could not open socket, error = %d",
-errno
);
goto cleanup;
}
if (bind(fd,
(struct sockaddr *) gairesult->ai_addr,
gairesult->ai_addrlen)) {
printk(UM_KERN_ERR L2TPV3_BIND_FAIL, errno);
goto cleanup;
}
if (gairesult != NULL)
freeaddrinfo(gairesult);
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);
if (strncmp(transport, TRANS_FD, TRANS_FD_LEN) == 0)
return user_init_fd_fds(parsed);
if (strncmp(transport, TRANS_VDE, TRANS_VDE_LEN) == 0)
return user_init_vde_fds(parsed);
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(const 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;
bpf[0] = (struct sock_filter){ 0x20, 0, 0, 0x00000008 };
bpf[1] = (struct sock_filter){ 0x15, 0, 3, ntohl(*mac1)};
bpf[2] = (struct sock_filter){ 0x28, 0, 0, 0x00000006 };
bpf[3] = (struct sock_filter){ 0x15, 0, 1, ntohs(*mac2)};
bpf[4] = (struct sock_filter){ 0x6, 0, 0, 0x00000000 };
bpf[5] = (struct sock_filter){ 0x6, 0, 0, 0x00040000 };
} else {
kfree(bpf_prog);
bpf_prog = NULL;
}
return bpf_prog;
}
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) {
printk(KERN_ERR "Failed to allocate bpf prog buffer");
return 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;
}
