um: Add a generic "fd" vector transport (bc8f8e4e) · Commits · 戴 / test

arch/um/drivers/vector_user.c

+59 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@
		#include <netdb.h>
		#include <stdlib.h>
		#include <os.h>
		#include <limits.h>
		#include <um_malloc.h>
		#include "vector_user.h"

		@@ -42,6 +43,9 @@
		#define TRANS_RAW "raw"
		#define TRANS_RAW_LEN strlen(TRANS_RAW)

		#define TRANS_FD "fd"
		#define TRANS_FD_LEN strlen(TRANS_FD)

		#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"
		@@ -347,6 +351,59 @@ unix_cleanup:
		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);
		if (result != NULL)
		kfree(result);
		return NULL;
		}

		static struct vector_fds user_init_raw_fds(struct arglist ifspec)
		{
		int rxfd = -1, txfd = -1;
		@@ -578,6 +635,8 @@ struct vector_fds *uml_vector_user_open(
		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);
		return NULL;
		}

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