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vector_user: add VDE support

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This is the actual implementation of VDE support as a vector transport.

Signed-off-by: Renzo Davoli <renzo@cs.unibo.it>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Renzo Davoli 2024-07-30 15:54:54 +02:00 committed by Richard Weinberger
parent 64dcf0b877
commit ab1d5895cf
1 changed files with 83 additions and 0 deletions
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83
arch/um/drivers/vector_user.c
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@ -46,6 +46,9 @@
#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"
@ -434,6 +437,84 @@ fd_cleanup:
return NULL;
}
/* enough char to store an int type */
#define ENOUGH(type) ((CHAR_BIT * sizeof(type) - 1) / 3 + 2)
#define ENOUGH_OCTAL(type) ((CHAR_BIT * sizeof(type) + 2) / 3)
/* vde_plug --descr xx --port2 xx --mod2 xx --group2 xx seqpacket://NN vnl (NULL) */
#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;
@ -673,6 +754,8 @@ struct vector_fds *uml_vector_user_open(
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;
}