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Fix vector raw inintialization logic

Browse source 
Vector RAW in UML needs to BPF filter its own MAC only
if QDISC_BYPASS has failed. If QDISC_BYPASS is successful, the
frames originated locally are not visible to readers on the
raw socket.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Anton Ivanov 2018-03-05 13:29:05 +00:00 • committed by Richard Weinberger
parent ce471fdbc6
commit e40238dedb
4 changed files with 21 additions and 10 deletions
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7
arch/um/drivers/vector_kern.c
View file

@ -188,7 +188,7 @@ static int get_transport_options(struct arglist *def)
if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0) if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
return (vec_rx | VECTOR_BPF); return (vec_rx | VECTOR_BPF);
if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0) if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
return (vec_rx | vec_tx | VECTOR_BPF); return (vec_rx | vec_tx);
return (vec_rx | vec_tx); return (vec_rx | vec_tx);
} }
@ -1230,6 +1230,11 @@ static int vector_net_open(struct net_device *dev)
irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE; irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
} }
if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
vp->options = vp->options | VECTOR_BPF;
}
if ((vp->options & VECTOR_BPF) != 0) if ((vp->options & VECTOR_BPF) != 0)
vp->bpf = uml_vector_default_bpf(vp->fds->rx_fd, dev->dev_addr); vp->bpf = uml_vector_default_bpf(vp->fds->rx_fd, dev->dev_addr);

1
arch/um/drivers/vector_kern.h
View file

@ -28,6 +28,7 @@
#define VECTOR_RX 1 #define VECTOR_RX 1
#define VECTOR_TX (1 << 1) #define VECTOR_TX (1 << 1)
#define VECTOR_BPF (1 << 2) #define VECTOR_BPF (1 << 2)
#define VECTOR_QDISC_BYPASS (1 << 3)
#define ETH_MAX_PACKET 1500 #define ETH_MAX_PACKET 1500
#define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */ #define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */

22
arch/um/drivers/vector_user.c
View file

@ -41,7 +41,6 @@
#define TRANS_RAW "raw" #define TRANS_RAW "raw"
#define TRANS_RAW_LEN strlen(TRANS_RAW) #define TRANS_RAW_LEN strlen(TRANS_RAW)
#define QDISC_FAIL "user_init_raw: could not disable qdisc on interface"
#define VNET_HDR_FAIL "could not enable vnet headers on fd %d" #define VNET_HDR_FAIL "could not enable vnet headers on fd %d"
#define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s" #define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s"
#define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i" #define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i"
@ -212,8 +211,6 @@ static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
int err = -ENOMEM; int err = -ENOMEM;
char *iface; char *iface;
struct vector_fds *result = NULL; struct vector_fds *result = NULL;
int optval = 1;
iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME); iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
if (iface == NULL) if (iface == NULL)
@ -256,12 +253,6 @@ static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
goto cleanup; goto cleanup;
} }
if (setsockopt(txfd,
SOL_PACKET, PACKET_QDISC_BYPASS,
&optval, sizeof(optval)) != 0) {
printk(UM_KERN_INFO QDISC_FAIL);
}
result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL); result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
if (result != NULL) { if (result != NULL) {
result->rx_fd = rxfd; result->rx_fd = rxfd;
@ -281,6 +272,19 @@ cleanup:
return NULL; 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) bool uml_raw_enable_vnet_headers(int fd)
{ {
int optval = 1; int optval = 1;

1
arch/um/drivers/vector_user.h
View file

@ -92,6 +92,7 @@ extern int uml_vector_recvmmsg(
); );
extern void *uml_vector_default_bpf(int fd, void *mac); extern void *uml_vector_default_bpf(int fd, void *mac);
extern int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len); extern int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len);
extern bool uml_raw_enable_qdisc_bypass(int fd);
extern bool uml_raw_enable_vnet_headers(int fd); extern bool uml_raw_enable_vnet_headers(int fd);
extern bool uml_tap_enable_vnet_headers(int fd); extern bool uml_tap_enable_vnet_headers(int fd);