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-rw-r--r--net/packet/af_packet.c222
1 files changed, 182 insertions, 40 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 2cee87da444..d56cae112dc 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -5,8 +5,6 @@
*
* PACKET - implements raw packet sockets.
*
- * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $
- *
* Authors: Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Alan Cox, <gw4pts@gw4pts.ampr.org>
@@ -188,6 +186,9 @@ struct packet_sock {
unsigned int pg_vec_order;
unsigned int pg_vec_pages;
unsigned int pg_vec_len;
+ enum tpacket_versions tp_version;
+ unsigned int tp_hdrlen;
+ unsigned int tp_reserve;
#endif
};
@@ -203,14 +204,52 @@ struct packet_skb_cb {
#ifdef CONFIG_PACKET_MMAP
-static inline struct tpacket_hdr *packet_lookup_frame(struct packet_sock *po, unsigned int position)
+static void *packet_lookup_frame(struct packet_sock *po, unsigned int position,
+ int status)
{
unsigned int pg_vec_pos, frame_offset;
+ union {
+ struct tpacket_hdr *h1;
+ struct tpacket2_hdr *h2;
+ void *raw;
+ } h;
pg_vec_pos = position / po->frames_per_block;
frame_offset = position % po->frames_per_block;
- return (struct tpacket_hdr *)(po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size));
+ h.raw = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size);
+ switch (po->tp_version) {
+ case TPACKET_V1:
+ if (status != h.h1->tp_status ? TP_STATUS_USER :
+ TP_STATUS_KERNEL)
+ return NULL;
+ break;
+ case TPACKET_V2:
+ if (status != h.h2->tp_status ? TP_STATUS_USER :
+ TP_STATUS_KERNEL)
+ return NULL;
+ break;
+ }
+ return h.raw;
+}
+
+static void __packet_set_status(struct packet_sock *po, void *frame, int status)
+{
+ union {
+ struct tpacket_hdr *h1;
+ struct tpacket2_hdr *h2;
+ void *raw;
+ } h;
+
+ h.raw = frame;
+ switch (po->tp_version) {
+ case TPACKET_V1:
+ h.h1->tp_status = status;
+ break;
+ case TPACKET_V2:
+ h.h2->tp_status = status;
+ break;
+ }
}
#endif
@@ -553,14 +592,19 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
struct sock *sk;
struct packet_sock *po;
struct sockaddr_ll *sll;
- struct tpacket_hdr *h;
+ union {
+ struct tpacket_hdr *h1;
+ struct tpacket2_hdr *h2;
+ void *raw;
+ } h;
u8 * skb_head = skb->data;
int skb_len = skb->len;
unsigned int snaplen, res;
unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
- unsigned short macoff, netoff;
+ unsigned short macoff, netoff, hdrlen;
struct sk_buff *copy_skb = NULL;
struct timeval tv;
+ struct timespec ts;
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@@ -592,10 +636,13 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
snaplen = res;
if (sk->sk_type == SOCK_DGRAM) {
- macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
+ macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
+ po->tp_reserve;
} else {
unsigned maclen = skb_network_offset(skb);
- netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen));
+ netoff = TPACKET_ALIGN(po->tp_hdrlen +
+ (maclen < 16 ? 16 : maclen)) +
+ po->tp_reserve;
macoff = netoff - maclen;
}
@@ -618,9 +665,8 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
}
spin_lock(&sk->sk_receive_queue.lock);
- h = packet_lookup_frame(po, po->head);
-
- if (h->tp_status)
+ h.raw = packet_lookup_frame(po, po->head, TP_STATUS_KERNEL);
+ if (!h.raw)
goto ring_is_full;
po->head = po->head != po->frame_max ? po->head+1 : 0;
po->stats.tp_packets++;
@@ -632,20 +678,41 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
status &= ~TP_STATUS_LOSING;
spin_unlock(&sk->sk_receive_queue.lock);
- skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen);
+ skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
- h->tp_len = skb->len;
- h->tp_snaplen = snaplen;
- h->tp_mac = macoff;
- h->tp_net = netoff;
- if (skb->tstamp.tv64)
- tv = ktime_to_timeval(skb->tstamp);
- else
- do_gettimeofday(&tv);
- h->tp_sec = tv.tv_sec;
- h->tp_usec = tv.tv_usec;
+ switch (po->tp_version) {
+ case TPACKET_V1:
+ h.h1->tp_len = skb->len;
+ h.h1->tp_snaplen = snaplen;
+ h.h1->tp_mac = macoff;
+ h.h1->tp_net = netoff;
+ if (skb->tstamp.tv64)
+ tv = ktime_to_timeval(skb->tstamp);
+ else
+ do_gettimeofday(&tv);
+ h.h1->tp_sec = tv.tv_sec;
+ h.h1->tp_usec = tv.tv_usec;
+ hdrlen = sizeof(*h.h1);
+ break;
+ case TPACKET_V2:
+ h.h2->tp_len = skb->len;
+ h.h2->tp_snaplen = snaplen;
+ h.h2->tp_mac = macoff;
+ h.h2->tp_net = netoff;
+ if (skb->tstamp.tv64)
+ ts = ktime_to_timespec(skb->tstamp);
+ else
+ getnstimeofday(&ts);
+ h.h2->tp_sec = ts.tv_sec;
+ h.h2->tp_nsec = ts.tv_nsec;
+ h.h2->tp_vlan_tci = skb->vlan_tci;
+ hdrlen = sizeof(*h.h2);
+ break;
+ default:
+ BUG();
+ }
- sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
+ sll = h.raw + TPACKET_ALIGN(hdrlen);
sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
sll->sll_family = AF_PACKET;
sll->sll_hatype = dev->type;
@@ -656,14 +723,14 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
else
sll->sll_ifindex = dev->ifindex;
- h->tp_status = status;
+ __packet_set_status(po, h.raw, status);
smp_mb();
{
struct page *p_start, *p_end;
- u8 *h_end = (u8 *)h + macoff + snaplen - 1;
+ u8 *h_end = h.raw + macoff + snaplen - 1;
- p_start = virt_to_page(h);
+ p_start = virt_to_page(h.raw);
p_end = virt_to_page(h_end);
while (p_start <= p_end) {
flush_dcache_page(p_start);
@@ -1109,6 +1176,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
aux.tp_snaplen = skb->len;
aux.tp_mac = 0;
aux.tp_net = skb_network_offset(skb);
+ aux.tp_vlan_tci = skb->vlan_tci;
put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
}
@@ -1175,7 +1243,8 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
return 0;
}
-static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what)
+static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
+ int what)
{
switch (i->type) {
case PACKET_MR_MULTICAST:
@@ -1185,13 +1254,14 @@ static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int w
dev_mc_delete(dev, i->addr, i->alen, 0);
break;
case PACKET_MR_PROMISC:
- dev_set_promiscuity(dev, what);
+ return dev_set_promiscuity(dev, what);
break;
case PACKET_MR_ALLMULTI:
- dev_set_allmulti(dev, what);
+ return dev_set_allmulti(dev, what);
break;
default:;
}
+ return 0;
}
static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
@@ -1245,7 +1315,11 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
i->count = 1;
i->next = po->mclist;
po->mclist = i;
- packet_dev_mc(dev, i, +1);
+ err = packet_dev_mc(dev, i, 1);
+ if (err) {
+ po->mclist = i->next;
+ kfree(i);
+ }
done:
rtnl_unlock();
@@ -1358,6 +1432,38 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
pkt_sk(sk)->copy_thresh = val;
return 0;
}
+ case PACKET_VERSION:
+ {
+ int val;
+
+ if (optlen != sizeof(val))
+ return -EINVAL;
+ if (po->pg_vec)
+ return -EBUSY;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+ switch (val) {
+ case TPACKET_V1:
+ case TPACKET_V2:
+ po->tp_version = val;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ }
+ case PACKET_RESERVE:
+ {
+ unsigned int val;
+
+ if (optlen != sizeof(val))
+ return -EINVAL;
+ if (po->pg_vec)
+ return -EBUSY;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+ po->tp_reserve = val;
+ return 0;
+ }
#endif
case PACKET_AUXDATA:
{
@@ -1433,6 +1539,37 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
data = &val;
break;
+#ifdef CONFIG_PACKET_MMAP
+ case PACKET_VERSION:
+ if (len > sizeof(int))
+ len = sizeof(int);
+ val = po->tp_version;
+ data = &val;
+ break;
+ case PACKET_HDRLEN:
+ if (len > sizeof(int))
+ len = sizeof(int);
+ if (copy_from_user(&val, optval, len))
+ return -EFAULT;
+ switch (val) {
+ case TPACKET_V1:
+ val = sizeof(struct tpacket_hdr);
+ break;
+ case TPACKET_V2:
+ val = sizeof(struct tpacket2_hdr);
+ break;
+ default:
+ return -EINVAL;
+ }
+ data = &val;
+ break;
+ case PACKET_RESERVE:
+ if (len > sizeof(unsigned int))
+ len = sizeof(unsigned int);
+ val = po->tp_reserve;
+ data = &val;
+ break;
+#endif
default:
return -ENOPROTOOPT;
}
@@ -1540,7 +1677,7 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd,
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
- if (sock_net(sk) != &init_net)
+ if (!net_eq(sock_net(sk), &init_net))
return -ENOIOCTLCMD;
return inet_dgram_ops.ioctl(sock, cmd, arg);
#endif
@@ -1566,11 +1703,8 @@ static unsigned int packet_poll(struct file * file, struct socket *sock,
spin_lock_bh(&sk->sk_receive_queue.lock);
if (po->pg_vec) {
unsigned last = po->head ? po->head-1 : po->frame_max;
- struct tpacket_hdr *h;
-
- h = packet_lookup_frame(po, last);
- if (h->tp_status)
+ if (packet_lookup_frame(po, last, TP_STATUS_USER))
mask |= POLLIN | POLLRDNORM;
}
spin_unlock_bh(&sk->sk_receive_queue.lock);
@@ -1665,11 +1799,21 @@ static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing
if (unlikely(po->pg_vec))
return -EBUSY;
+ switch (po->tp_version) {
+ case TPACKET_V1:
+ po->tp_hdrlen = TPACKET_HDRLEN;
+ break;
+ case TPACKET_V2:
+ po->tp_hdrlen = TPACKET2_HDRLEN;
+ break;
+ }
+
if (unlikely((int)req->tp_block_size <= 0))
return -EINVAL;
if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
return -EINVAL;
- if (unlikely(req->tp_frame_size < TPACKET_HDRLEN))
+ if (unlikely(req->tp_frame_size < po->tp_hdrlen +
+ po->tp_reserve))
return -EINVAL;
if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
return -EINVAL;
@@ -1688,13 +1832,11 @@ static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing
goto out;
for (i = 0; i < req->tp_block_nr; i++) {
- char *ptr = pg_vec[i];
- struct tpacket_hdr *header;
+ void *ptr = pg_vec[i];
int k;
for (k = 0; k < po->frames_per_block; k++) {
- header = (struct tpacket_hdr *) ptr;
- header->tp_status = TP_STATUS_KERNEL;
+ __packet_set_status(po, ptr, TP_STATUS_KERNEL);
ptr += req->tp_frame_size;
}
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-13 20:09:47 +0000