diff options
Diffstat (limited to 'arch/um/drivers/vector_user.c')
-rw-r--r-- | arch/um/drivers/vector_user.c | 293 |
1 files changed, 207 insertions, 86 deletions
diff --git a/arch/um/drivers/vector_user.c b/arch/um/drivers/vector_user.c index b3f7b3ca896d..e2c969b9f7ee 100644 --- a/arch/um/drivers/vector_user.c +++ b/arch/um/drivers/vector_user.c @@ -1,6 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) - * Licensed under the GPL */ #include <stdio.h> @@ -17,6 +17,7 @@ #include <sys/stat.h> #include <fcntl.h> #include <sys/socket.h> +#include <sys/un.h> #include <net/ethernet.h> #include <netinet/ip.h> #include <netinet/ether.h> @@ -33,7 +34,8 @@ #define ID_GRE 0 #define ID_L2TPV3 1 -#define ID_MAX 1 +#define ID_BESS 2 +#define ID_MAX 2 #define TOKEN_IFNAME "ifname" @@ -43,8 +45,11 @@ #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 to %d, err %d\n" +#define MAX_UN_LEN 107 + /* This is very ugly and brute force lookup, but it is done * only once at initialization so not worth doing hashes or * anything more intelligent @@ -114,12 +119,76 @@ cleanup: #define PATH_NET_TUN "/dev/net/tun" -static struct vector_fds *user_init_tap_fds(struct arglist *ifspec) + +static int create_tap_fd(char *iface) { struct ifreq ifr; int fd = -1; - struct sockaddr_ll sock; 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; + strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1); + + 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)); + strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1); + 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; char *iface; struct vector_fds *result = NULL; @@ -141,117 +210,167 @@ static struct vector_fds *user_init_tap_fds(struct arglist *ifspec) /* TAP */ - fd = open(PATH_NET_TUN, O_RDWR); + fd = create_tap_fd(iface); if (fd < 0) { - printk(UM_KERN_ERR "uml_tap: failed to open tun device\n"); + printk(UM_KERN_ERR "uml_tap: failed to create tun interface\n"); goto tap_cleanup; } result->tx_fd = fd; - memset(&ifr, 0, sizeof(ifr)); - ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; - strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1); + result->rx_fd = fd; + return result; +tap_cleanup: + printk(UM_KERN_ERR "user_init_tap: init failed, error %d", fd); + if (result != NULL) + kfree(result); + return NULL; +} - err = ioctl(fd, TUNSETIFF, (void *) &ifr); - if (err != 0) { - printk(UM_KERN_ERR "uml_tap: failed to select tap interface\n"); - goto tap_cleanup; +static struct vector_fds *user_init_hybrid_fds(struct arglist *ifspec) +{ + char *iface; + struct vector_fds *result = 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; } - offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6; - ioctl(fd, TUNSETOFFLOAD, offload); + 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; + + /* TAP */ + + 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; + } /* RAW */ - fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); - if (fd == -1) { + 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 socket: %i\n", -errno); - goto tap_cleanup; + "uml_tap: failed to create paired raw socket: %i\n", result->rx_fd); + goto hybrid_cleanup; } - result->rx_fd = fd; - memset(&ifr, 0, sizeof(ifr)); - strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1); - if (ioctl(fd, SIOCGIFINDEX, (void *) &ifr) < 0) { - printk(UM_KERN_ERR - "uml_tap: failed to set interface: %i\n", -errno); - goto tap_cleanup; + return result; +hybrid_cleanup: + printk(UM_KERN_ERR "user_init_hybrid: init failed"); + if (result != NULL) + 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; } - sock.sll_family = AF_PACKET; - sock.sll_protocol = htons(ETH_P_ALL); - sock.sll_ifindex = ifr.ifr_ifindex; + 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; + } - if (bind(fd, - (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) { + fd = socket(AF_UNIX, socktype, 0); + if (fd == -1) { printk(UM_KERN_ERR - "user_init_tap: failed to bind raw pair, err %d\n", - -errno); - goto tap_cleanup; + "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, 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; -tap_cleanup: - printk(UM_KERN_ERR "user_init_tap: init failed, error %d", err); - if (result != NULL) { - if (result->rx_fd >= 0) - os_close_file(result->rx_fd); - if (result->tx_fd >= 0) - os_close_file(result->tx_fd); +unix_cleanup: + if (fd >= 0) + os_close_file(fd); + if (remote_addr != NULL) + kfree(remote_addr); + if (result != NULL) kfree(result); - } return NULL; } - static struct vector_fds *user_init_raw_fds(struct arglist *ifspec) { - struct ifreq ifr; int rxfd = -1, txfd = -1; - struct sockaddr_ll sock; int err = -ENOMEM; char *iface; struct vector_fds *result = NULL; iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME); if (iface == NULL) - goto cleanup; + goto raw_cleanup; - rxfd = socket(AF_PACKET, SOCK_RAW, ETH_P_ALL); + rxfd = create_raw_fd(iface, ETH_P_ALL, ETH_P_ALL); if (rxfd == -1) { err = -errno; - goto cleanup; + goto raw_cleanup; } - txfd = socket(AF_PACKET, SOCK_RAW, 0); /* Turn off RX on this fd */ + txfd = create_raw_fd(iface, 0, ETH_P_IP); /* Turn off RX on this fd */ if (txfd == -1) { err = -errno; - goto cleanup; + goto raw_cleanup; } - memset(&ifr, 0, sizeof(ifr)); - strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1); - if (ioctl(rxfd, SIOCGIFINDEX, (void *) &ifr) < 0) { - err = -errno; - goto cleanup; - } - - sock.sll_family = AF_PACKET; - sock.sll_protocol = htons(ETH_P_ALL); - sock.sll_ifindex = ifr.ifr_ifindex; - - if (bind(rxfd, - (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) { - err = -errno; - goto cleanup; - } - - sock.sll_family = AF_PACKET; - sock.sll_protocol = htons(ETH_P_IP); - sock.sll_ifindex = ifr.ifr_ifindex; - - if (bind(txfd, - (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) { - err = -errno; - goto cleanup; - } - result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL); if (result != NULL) { result->rx_fd = rxfd; @@ -260,13 +379,10 @@ static struct vector_fds *user_init_raw_fds(struct arglist *ifspec) result->remote_addr_size = 0; } return result; -cleanup: +raw_cleanup: printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err); - if (rxfd >= 0) - os_close_file(rxfd); - if (txfd >= 0) - os_close_file(txfd); - kfree(result); + if (result != NULL) + kfree(result); return NULL; } @@ -456,12 +572,16 @@ struct vector_fds *uml_vector_user_open( } 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; } @@ -482,8 +602,9 @@ int uml_vector_sendmsg(int fd, void *hdr, int flags) int uml_vector_recvmsg(int fd, void *hdr, int flags) { int n; + struct msghdr *msg = (struct msghdr *) hdr; - CATCH_EINTR(n = recvmsg(fd, (struct msghdr *) hdr, flags)); + CATCH_EINTR(n = readv(fd, msg->msg_iov, msg->msg_iovlen)); if ((n < 0) && (errno == EAGAIN)) return 0; if (n >= 0) @@ -497,7 +618,7 @@ 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)) + if ((n < 0) && ((errno == EAGAIN) || (errno == ENOBUFS))) return 0; if (n >= 0) return n; @@ -514,7 +635,7 @@ int uml_vector_sendmmsg( int n; CATCH_EINTR(n = sendmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags)); - if ((n < 0) && (errno == EAGAIN)) + if ((n < 0) && ((errno == EAGAIN) || (errno == ENOBUFS))) return 0; if (n >= 0) return n; |