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-rw-r--r--net/packet/af_packet.c115
1 files changed, 99 insertions, 16 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 18f616f487..4692a9ef11 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -538,6 +538,61 @@ static void *packet_current_frame(struct packet_sock *po,
return packet_lookup_frame(po, rb, rb->head, status);
}
+static u16 vlan_get_tci(struct sk_buff *skb, struct net_device *dev)
+{
+ u8 *skb_orig_data = skb->data;
+ int skb_orig_len = skb->len;
+ struct vlan_hdr vhdr, *vh;
+ unsigned int header_len;
+
+ if (!dev)
+ return 0;
+
+ /* In the SOCK_DGRAM scenario, skb data starts at the network
+ * protocol, which is after the VLAN headers. The outer VLAN
+ * header is at the hard_header_len offset in non-variable
+ * length link layer headers. If it's a VLAN device, the
+ * min_header_len should be used to exclude the VLAN header
+ * size.
+ */
+ if (dev->min_header_len == dev->hard_header_len)
+ header_len = dev->hard_header_len;
+ else if (is_vlan_dev(dev))
+ header_len = dev->min_header_len;
+ else
+ return 0;
+
+ skb_push(skb, skb->data - skb_mac_header(skb));
+ vh = skb_header_pointer(skb, header_len, sizeof(vhdr), &vhdr);
+ if (skb_orig_data != skb->data) {
+ skb->data = skb_orig_data;
+ skb->len = skb_orig_len;
+ }
+ if (unlikely(!vh))
+ return 0;
+
+ return ntohs(vh->h_vlan_TCI);
+}
+
+static __be16 vlan_get_protocol_dgram(struct sk_buff *skb)
+{
+ __be16 proto = skb->protocol;
+
+ if (unlikely(eth_type_vlan(proto))) {
+ u8 *skb_orig_data = skb->data;
+ int skb_orig_len = skb->len;
+
+ skb_push(skb, skb->data - skb_mac_header(skb));
+ proto = __vlan_get_protocol(skb, proto, NULL);
+ if (skb_orig_data != skb->data) {
+ skb->data = skb_orig_data;
+ skb->len = skb_orig_len;
+ }
+ }
+
+ return proto;
+}
+
static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
{
del_timer_sync(&pkc->retire_blk_timer);
@@ -1007,10 +1062,16 @@ static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
struct tpacket3_hdr *ppd)
{
+ struct packet_sock *po = container_of(pkc, struct packet_sock, rx_ring.prb_bdqc);
+
if (skb_vlan_tag_present(pkc->skb)) {
ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
+ } else if (unlikely(po->sk.sk_type == SOCK_DGRAM && eth_type_vlan(pkc->skb->protocol))) {
+ ppd->hv1.tp_vlan_tci = vlan_get_tci(pkc->skb, pkc->skb->dev);
+ ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->protocol);
+ ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
} else {
ppd->hv1.tp_vlan_tci = 0;
ppd->hv1.tp_vlan_tpid = 0;
@@ -2428,6 +2489,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
+ } else if (unlikely(sk->sk_type == SOCK_DGRAM && eth_type_vlan(skb->protocol))) {
+ h.h2->tp_vlan_tci = vlan_get_tci(skb, skb->dev);
+ h.h2->tp_vlan_tpid = ntohs(skb->protocol);
+ status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
} else {
h.h2->tp_vlan_tci = 0;
h.h2->tp_vlan_tpid = 0;
@@ -2457,7 +2522,8 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
sll->sll_family = AF_PACKET;
sll->sll_hatype = dev->type;
- sll->sll_protocol = skb->protocol;
+ sll->sll_protocol = (sk->sk_type == SOCK_DGRAM) ?
+ vlan_get_protocol_dgram(skb) : skb->protocol;
sll->sll_pkttype = skb->pkt_type;
if (unlikely(packet_sock_flag(po, PACKET_SOCK_ORIGDEV)))
sll->sll_ifindex = orig_dev->ifindex;
@@ -2522,8 +2588,7 @@ static void tpacket_destruct_skb(struct sk_buff *skb)
ts = __packet_set_timestamp(po, ph, skb);
__packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
- if (!packet_read_pending(&po->tx_ring))
- complete(&po->skb_completion);
+ complete(&po->skb_completion);
}
sock_wfree(skb);
@@ -3483,7 +3548,8 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
/* Original length was stored in sockaddr_ll fields */
origlen = PACKET_SKB_CB(skb)->sa.origlen;
sll->sll_family = AF_PACKET;
- sll->sll_protocol = skb->protocol;
+ sll->sll_protocol = (sock->type == SOCK_DGRAM) ?
+ vlan_get_protocol_dgram(skb) : skb->protocol;
}
sock_recv_cmsgs(msg, sk, skb);
@@ -3540,6 +3606,21 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
aux.tp_vlan_tci = skb_vlan_tag_get(skb);
aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
+ } else if (unlikely(sock->type == SOCK_DGRAM && eth_type_vlan(skb->protocol))) {
+ struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(sock_net(sk), sll->sll_ifindex);
+ if (dev) {
+ aux.tp_vlan_tci = vlan_get_tci(skb, dev);
+ aux.tp_vlan_tpid = ntohs(skb->protocol);
+ aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
+ } else {
+ aux.tp_vlan_tci = 0;
+ aux.tp_vlan_tpid = 0;
+ }
+ rcu_read_unlock();
} else {
aux.tp_vlan_tci = 0;
aux.tp_vlan_tpid = 0;
@@ -3800,28 +3881,30 @@ packet_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval,
case PACKET_TX_RING:
{
union tpacket_req_u req_u;
- int len;
+ ret = -EINVAL;
lock_sock(sk);
switch (po->tp_version) {
case TPACKET_V1:
case TPACKET_V2:
- len = sizeof(req_u.req);
+ if (optlen < sizeof(req_u.req))
+ break;
+ ret = copy_from_sockptr(&req_u.req, optval,
+ sizeof(req_u.req)) ?
+ -EINVAL : 0;
break;
case TPACKET_V3:
default:
- len = sizeof(req_u.req3);
+ if (optlen < sizeof(req_u.req3))
+ break;
+ ret = copy_from_sockptr(&req_u.req3, optval,
+ sizeof(req_u.req3)) ?
+ -EINVAL : 0;
break;
}
- if (optlen < len) {
- ret = -EINVAL;
- } else {
- if (copy_from_sockptr(&req_u.req, optval, len))
- ret = -EFAULT;
- else
- ret = packet_set_ring(sk, &req_u, 0,
- optname == PACKET_TX_RING);
- }
+ if (!ret)
+ ret = packet_set_ring(sk, &req_u, 0,
+ optname == PACKET_TX_RING);
release_sock(sk);
return ret;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 05:59:27 +0000