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-rw-r--r--net/packet/af_packet.c878
1 files changed, 562 insertions, 316 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index e639645e8fe..b85c67ccb79 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -88,7 +88,7 @@
#include <linux/virtio_net.h>
#include <linux/errqueue.h>
#include <linux/net_tstamp.h>
-
+#include <linux/percpu.h>
#ifdef CONFIG_INET
#include <net/inet_common.h>
#endif
@@ -158,10 +158,16 @@ struct packet_mreq_max {
unsigned char mr_address[MAX_ADDR_LEN];
};
+union tpacket_uhdr {
+ struct tpacket_hdr *h1;
+ struct tpacket2_hdr *h2;
+ struct tpacket3_hdr *h3;
+ void *raw;
+};
+
static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
int closing, int tx_ring);
-
#define V3_ALIGNMENT (8)
#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
@@ -181,6 +187,8 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
struct packet_sock;
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
+static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev);
static void *packet_previous_frame(struct packet_sock *po,
struct packet_ring_buffer *rb,
@@ -229,6 +237,99 @@ struct packet_skb_cb {
static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
static void __fanout_link(struct sock *sk, struct packet_sock *po);
+static int packet_direct_xmit(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ const struct net_device_ops *ops = dev->netdev_ops;
+ netdev_features_t features;
+ struct netdev_queue *txq;
+ int ret = NETDEV_TX_BUSY;
+ u16 queue_map;
+
+ if (unlikely(!netif_running(dev) ||
+ !netif_carrier_ok(dev)))
+ goto drop;
+
+ features = netif_skb_features(skb);
+ if (skb_needs_linearize(skb, features) &&
+ __skb_linearize(skb))
+ goto drop;
+
+ queue_map = skb_get_queue_mapping(skb);
+ txq = netdev_get_tx_queue(dev, queue_map);
+
+ local_bh_disable();
+
+ HARD_TX_LOCK(dev, txq, smp_processor_id());
+ if (!netif_xmit_frozen_or_drv_stopped(txq)) {
+ ret = ops->ndo_start_xmit(skb, dev);
+ if (ret == NETDEV_TX_OK)
+ txq_trans_update(txq);
+ }
+ HARD_TX_UNLOCK(dev, txq);
+
+ local_bh_enable();
+
+ if (!dev_xmit_complete(ret))
+ kfree_skb(skb);
+
+ return ret;
+drop:
+ atomic_long_inc(&dev->tx_dropped);
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+}
+
+static struct net_device *packet_cached_dev_get(struct packet_sock *po)
+{
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = rcu_dereference(po->cached_dev);
+ if (likely(dev))
+ dev_hold(dev);
+ rcu_read_unlock();
+
+ return dev;
+}
+
+static void packet_cached_dev_assign(struct packet_sock *po,
+ struct net_device *dev)
+{
+ rcu_assign_pointer(po->cached_dev, dev);
+}
+
+static void packet_cached_dev_reset(struct packet_sock *po)
+{
+ RCU_INIT_POINTER(po->cached_dev, NULL);
+}
+
+static bool packet_use_direct_xmit(const struct packet_sock *po)
+{
+ return po->xmit == packet_direct_xmit;
+}
+
+static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
+{
+ return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
+}
+
+static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+ u16 queue_index;
+
+ if (ops->ndo_select_queue) {
+ queue_index = ops->ndo_select_queue(dev, skb, NULL,
+ __packet_pick_tx_queue);
+ queue_index = netdev_cap_txqueue(dev, queue_index);
+ } else {
+ queue_index = __packet_pick_tx_queue(dev, skb);
+ }
+
+ skb_set_queue_mapping(skb, queue_index);
+}
+
/* register_prot_hook must be invoked with the po->bind_lock held,
* or from a context in which asynchronous accesses to the packet
* socket is not possible (packet_create()).
@@ -236,11 +337,13 @@ static void __fanout_link(struct sock *sk, struct packet_sock *po);
static void register_prot_hook(struct sock *sk)
{
struct packet_sock *po = pkt_sk(sk);
+
if (!po->running) {
if (po->fanout)
__fanout_link(sk, po);
else
dev_add_pack(&po->prot_hook);
+
sock_hold(sk);
po->running = 1;
}
@@ -258,10 +361,12 @@ static void __unregister_prot_hook(struct sock *sk, bool sync)
struct packet_sock *po = pkt_sk(sk);
po->running = 0;
+
if (po->fanout)
__fanout_unlink(sk, po);
else
__dev_remove_pack(&po->prot_hook);
+
__sock_put(sk);
if (sync) {
@@ -288,11 +393,7 @@ static inline __pure struct page *pgv_to_page(void *addr)
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;
+ union tpacket_uhdr h;
h.raw = frame;
switch (po->tp_version) {
@@ -315,11 +416,7 @@ static void __packet_set_status(struct packet_sock *po, void *frame, int status)
static int __packet_get_status(struct packet_sock *po, void *frame)
{
- union {
- struct tpacket_hdr *h1;
- struct tpacket2_hdr *h2;
- void *raw;
- } h;
+ union tpacket_uhdr h;
smp_rmb();
@@ -339,17 +436,66 @@ static int __packet_get_status(struct packet_sock *po, void *frame)
}
}
+static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
+ unsigned int flags)
+{
+ struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
+
+ if (shhwtstamps) {
+ if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) &&
+ ktime_to_timespec_cond(shhwtstamps->syststamp, ts))
+ return TP_STATUS_TS_SYS_HARDWARE;
+ if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
+ ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
+ return TP_STATUS_TS_RAW_HARDWARE;
+ }
+
+ if (ktime_to_timespec_cond(skb->tstamp, ts))
+ return TP_STATUS_TS_SOFTWARE;
+
+ return 0;
+}
+
+static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
+ struct sk_buff *skb)
+{
+ union tpacket_uhdr h;
+ struct timespec ts;
+ __u32 ts_status;
+
+ if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
+ return 0;
+
+ h.raw = frame;
+ switch (po->tp_version) {
+ case TPACKET_V1:
+ h.h1->tp_sec = ts.tv_sec;
+ h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
+ break;
+ case TPACKET_V2:
+ h.h2->tp_sec = ts.tv_sec;
+ h.h2->tp_nsec = ts.tv_nsec;
+ break;
+ case TPACKET_V3:
+ default:
+ WARN(1, "TPACKET version not supported.\n");
+ BUG();
+ }
+
+ /* one flush is safe, as both fields always lie on the same cacheline */
+ flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
+ smp_wmb();
+
+ return ts_status;
+}
+
static void *packet_lookup_frame(struct packet_sock *po,
struct packet_ring_buffer *rb,
unsigned int position,
int status)
{
unsigned int pg_vec_pos, frame_offset;
- union {
- struct tpacket_hdr *h1;
- struct tpacket2_hdr *h2;
- void *raw;
- } h;
+ union tpacket_uhdr h;
pg_vec_pos = position / rb->frames_per_block;
frame_offset = position % rb->frames_per_block;
@@ -381,11 +527,12 @@ static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
{
struct tpacket_kbdq_core *pkc;
- pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
+ pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) :
+ GET_PBDQC_FROM_RB(&po->rx_ring);
- spin_lock(&rb_queue->lock);
+ spin_lock_bh(&rb_queue->lock);
pkc->delete_blk_timer = 1;
- spin_unlock(&rb_queue->lock);
+ spin_unlock_bh(&rb_queue->lock);
prb_del_retire_blk_timer(pkc);
}
@@ -407,7 +554,8 @@ static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
if (tx_ring)
BUG();
- pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
+ pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) :
+ GET_PBDQC_FROM_RB(&po->rx_ring);
prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
}
@@ -465,7 +613,7 @@ static void init_prb_bdqc(struct packet_sock *po,
struct pgv *pg_vec,
union tpacket_req_u *req_u, int tx_ring)
{
- struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
+ struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
struct tpacket_block_desc *pbd;
memset(p1, 0x0, sizeof(*p1));
@@ -479,7 +627,7 @@ static void init_prb_bdqc(struct packet_sock *po,
p1->hdrlen = po->tp_hdrlen;
p1->version = po->tp_version;
p1->last_kactive_blk_num = 0;
- po->stats_u.stats3.tp_freeze_q_cnt = 0;
+ po->stats.stats3.tp_freeze_q_cnt = 0;
if (req_u->req3.tp_retire_blk_tov)
p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
else
@@ -529,7 +677,7 @@ static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
static void prb_retire_rx_blk_timer_expired(unsigned long data)
{
struct packet_sock *po = (struct packet_sock *)data;
- struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
+ struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
unsigned int frozen;
struct tpacket_block_desc *pbd;
@@ -647,7 +795,7 @@ static void prb_close_block(struct tpacket_kbdq_core *pkc1,
struct tpacket3_hdr *last_pkt;
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
- if (po->stats.tp_drops)
+ if (po->stats.stats3.tp_drops)
status |= TP_STATUS_LOSING;
last_pkt = (struct tpacket3_hdr *)pkc1->prev;
@@ -693,36 +841,33 @@ static void prb_open_block(struct tpacket_kbdq_core *pkc1,
smp_rmb();
- if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {
+ /* We could have just memset this but we will lose the
+ * flexibility of making the priv area sticky
+ */
- /* We could have just memset this but we will lose the
- * flexibility of making the priv area sticky
- */
- BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
- BLOCK_NUM_PKTS(pbd1) = 0;
- BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
- getnstimeofday(&ts);
- h1->ts_first_pkt.ts_sec = ts.tv_sec;
- h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
- pkc1->pkblk_start = (char *)pbd1;
- pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
- BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
- BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
- pbd1->version = pkc1->version;
- pkc1->prev = pkc1->nxt_offset;
- pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
- prb_thaw_queue(pkc1);
- _prb_refresh_rx_retire_blk_timer(pkc1);
-
- smp_wmb();
+ BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
+ BLOCK_NUM_PKTS(pbd1) = 0;
+ BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
- return;
- }
+ getnstimeofday(&ts);
+
+ h1->ts_first_pkt.ts_sec = ts.tv_sec;
+ h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
+
+ pkc1->pkblk_start = (char *)pbd1;
+ pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
+
+ BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
+ BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
+
+ pbd1->version = pkc1->version;
+ pkc1->prev = pkc1->nxt_offset;
+ pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
- WARN(1, "ERROR block:%p is NOT FREE status:%d kactive_blk_num:%d\n",
- pbd1, BLOCK_STATUS(pbd1), pkc1->kactive_blk_num);
- dump_stack();
- BUG();
+ prb_thaw_queue(pkc1);
+ _prb_refresh_rx_retire_blk_timer(pkc1);
+
+ smp_wmb();
}
/*
@@ -752,7 +897,7 @@ static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
struct packet_sock *po)
{
pkc->reset_pending_on_curr_blk = 1;
- po->stats_u.stats3.tp_freeze_q_cnt++;
+ po->stats.stats3.tp_freeze_q_cnt++;
}
#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
@@ -813,10 +958,6 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
prb_close_block(pkc, pbd, po, status);
return;
}
-
- WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
- dump_stack();
- BUG();
}
static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
@@ -839,7 +980,7 @@ static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
struct tpacket3_hdr *ppd)
{
- ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
+ ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
}
static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
@@ -853,9 +994,11 @@ static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
{
if (vlan_tx_tag_present(pkc->skb)) {
ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb);
- ppd->tp_status = TP_STATUS_VLAN_VALID;
+ ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
+ 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;
ppd->tp_status = TP_STATUS_AVAILABLE;
}
}
@@ -863,6 +1006,7 @@ static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
struct tpacket3_hdr *ppd)
{
+ ppd->hv1.tp_padding = 0;
prb_fill_vlan_info(pkc, ppd);
if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
@@ -973,11 +1117,11 @@ static void *packet_current_rx_frame(struct packet_sock *po,
static void *prb_lookup_block(struct packet_sock *po,
struct packet_ring_buffer *rb,
- unsigned int previous,
+ unsigned int idx,
int status)
{
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
- struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);
+ struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
if (status != BLOCK_STATUS(pbd))
return NULL;
@@ -1041,6 +1185,70 @@ static void packet_increment_head(struct packet_ring_buffer *buff)
buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
}
+static void packet_inc_pending(struct packet_ring_buffer *rb)
+{
+ this_cpu_inc(*rb->pending_refcnt);
+}
+
+static void packet_dec_pending(struct packet_ring_buffer *rb)
+{
+ this_cpu_dec(*rb->pending_refcnt);
+}
+
+static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
+{
+ unsigned int refcnt = 0;
+ int cpu;
+
+ /* We don't use pending refcount in rx_ring. */
+ if (rb->pending_refcnt == NULL)
+ return 0;
+
+ for_each_possible_cpu(cpu)
+ refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
+
+ return refcnt;
+}
+
+static int packet_alloc_pending(struct packet_sock *po)
+{
+ po->rx_ring.pending_refcnt = NULL;
+
+ po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
+ if (unlikely(po->tx_ring.pending_refcnt == NULL))
+ return -ENOBUFS;
+
+ return 0;
+}
+
+static void packet_free_pending(struct packet_sock *po)
+{
+ free_percpu(po->tx_ring.pending_refcnt);
+}
+
+static bool packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
+{
+ struct sock *sk = &po->sk;
+ bool has_room;
+
+ if (po->prot_hook.func != tpacket_rcv)
+ return (atomic_read(&sk->sk_rmem_alloc) + skb->truesize)
+ <= sk->sk_rcvbuf;
+
+ spin_lock(&sk->sk_receive_queue.lock);
+ if (po->tp_version == TPACKET_V3)
+ has_room = prb_lookup_block(po, &po->rx_ring,
+ po->rx_ring.prb_bdqc.kactive_blk_num,
+ TP_STATUS_KERNEL);
+ else
+ has_room = packet_lookup_frame(po, &po->rx_ring,
+ po->rx_ring.head,
+ TP_STATUS_KERNEL);
+ spin_unlock(&sk->sk_receive_queue.lock);
+
+ return has_room;
+}
+
static void packet_sock_destruct(struct sock *sk)
{
skb_queue_purge(&sk->sk_error_queue);
@@ -1066,16 +1274,16 @@ static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
return x;
}
-static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
+static unsigned int fanout_demux_hash(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
{
- u32 idx, hash = skb->rxhash;
-
- idx = ((u64)hash * num) >> 32;
-
- return f->arr[idx];
+ return reciprocal_scale(skb_get_hash(skb), num);
}
-static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
+static unsigned int fanout_demux_lb(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
{
int cur, old;
@@ -1083,14 +1291,54 @@ static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb
while ((old = atomic_cmpxchg(&f->rr_cur, cur,
fanout_rr_next(f, num))) != cur)
cur = old;
- return f->arr[cur];
+ return cur;
+}
+
+static unsigned int fanout_demux_cpu(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
+{
+ return smp_processor_id() % num;
+}
+
+static unsigned int fanout_demux_rnd(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
+{
+ return prandom_u32_max(num);
}
-static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
+static unsigned int fanout_demux_rollover(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int idx, unsigned int skip,
+ unsigned int num)
{
- unsigned int cpu = smp_processor_id();
+ unsigned int i, j;
+
+ i = j = min_t(int, f->next[idx], num - 1);
+ do {
+ if (i != skip && packet_rcv_has_room(pkt_sk(f->arr[i]), skb)) {
+ if (i != j)
+ f->next[idx] = i;
+ return i;
+ }
+ if (++i == num)
+ i = 0;
+ } while (i != j);
- return f->arr[cpu % num];
+ return idx;
+}
+
+static unsigned int fanout_demux_qm(struct packet_fanout *f,
+ struct sk_buff *skb,
+ unsigned int num)
+{
+ return skb_get_queue_mapping(skb) % num;
+}
+
+static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
+{
+ return f->flags & (flag >> 8);
}
static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
@@ -1099,7 +1347,7 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
struct packet_fanout *f = pt->af_packet_priv;
unsigned int num = f->num_members;
struct packet_sock *po;
- struct sock *sk;
+ unsigned int idx;
if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
!num) {
@@ -1110,23 +1358,36 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
switch (f->type) {
case PACKET_FANOUT_HASH:
default:
- if (f->defrag) {
+ if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
if (!skb)
return 0;
}
- skb_get_rxhash(skb);
- sk = fanout_demux_hash(f, skb, num);
+ idx = fanout_demux_hash(f, skb, num);
break;
case PACKET_FANOUT_LB:
- sk = fanout_demux_lb(f, skb, num);
+ idx = fanout_demux_lb(f, skb, num);
break;
case PACKET_FANOUT_CPU:
- sk = fanout_demux_cpu(f, skb, num);
+ idx = fanout_demux_cpu(f, skb, num);
+ break;
+ case PACKET_FANOUT_RND:
+ idx = fanout_demux_rnd(f, skb, num);
+ break;
+ case PACKET_FANOUT_QM:
+ idx = fanout_demux_qm(f, skb, num);
+ break;
+ case PACKET_FANOUT_ROLLOVER:
+ idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num);
break;
}
- po = pkt_sk(sk);
+ po = pkt_sk(f->arr[idx]);
+ if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER) &&
+ unlikely(!packet_rcv_has_room(po, skb))) {
+ idx = fanout_demux_rollover(f, skb, idx, idx, num);
+ po = pkt_sk(f->arr[idx]);
+ }
return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
}
@@ -1162,9 +1423,9 @@ static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
spin_unlock(&f->lock);
}
-static bool match_fanout_group(struct packet_type *ptype, struct sock * sk)
+static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
{
- if (ptype->af_packet_priv == (void*)((struct packet_sock *)sk)->fanout)
+ if (ptype->af_packet_priv == (void *)((struct packet_sock *)sk)->fanout)
return true;
return false;
@@ -1175,13 +1436,18 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
struct packet_sock *po = pkt_sk(sk);
struct packet_fanout *f, *match;
u8 type = type_flags & 0xff;
- u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
+ u8 flags = type_flags >> 8;
int err;
switch (type) {
+ case PACKET_FANOUT_ROLLOVER:
+ if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
+ return -EINVAL;
case PACKET_FANOUT_HASH:
case PACKET_FANOUT_LB:
case PACKET_FANOUT_CPU:
+ case PACKET_FANOUT_RND:
+ case PACKET_FANOUT_QM:
break;
default:
return -EINVAL;
@@ -1203,7 +1469,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
}
}
err = -EINVAL;
- if (match && match->defrag != defrag)
+ if (match && match->flags != flags)
goto out;
if (!match) {
err = -ENOMEM;
@@ -1213,7 +1479,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
write_pnet(&match->net, sock_net(sk));
match->id = id;
match->type = type;
- match->defrag = defrag;
+ match->flags = flags;
atomic_set(&match->rr_cur, 0);
INIT_LIST_HEAD(&match->list);
spin_lock_init(&match->lock);
@@ -1344,7 +1610,7 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
- struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
struct sk_buff *skb = NULL;
struct net_device *dev;
__be16 proto = 0;
@@ -1443,13 +1709,14 @@ retry:
skb->dev = dev;
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
- err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
- if (err < 0)
- goto out_unlock;
+
+ sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
if (unlikely(extra_len == 4))
skb->no_fcs = 1;
+ skb_probe_transport_header(skb, 0);
+
dev_queue_xmit(skb);
rcu_read_unlock();
return len;
@@ -1577,16 +1844,16 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
nf_reset(skb);
spin_lock(&sk->sk_receive_queue.lock);
- po->stats.tp_packets++;
+ po->stats.stats1.tp_packets++;
skb->dropcount = atomic_read(&sk->sk_drops);
__skb_queue_tail(&sk->sk_receive_queue, skb);
spin_unlock(&sk->sk_receive_queue.lock);
- sk->sk_data_ready(sk, skb->len);
+ sk->sk_data_ready(sk);
return 0;
drop_n_acct:
spin_lock(&sk->sk_receive_queue.lock);
- po->stats.tp_drops++;
+ po->stats.stats1.tp_drops++;
atomic_inc(&sk->sk_drops);
spin_unlock(&sk->sk_receive_queue.lock);
@@ -1606,21 +1873,22 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
struct sock *sk;
struct packet_sock *po;
struct sockaddr_ll *sll;
- union {
- struct tpacket_hdr *h1;
- struct tpacket2_hdr *h2;
- struct tpacket3_hdr *h3;
- void *raw;
- } h;
+ union tpacket_uhdr h;
u8 *skb_head = skb->data;
int skb_len = skb->len;
unsigned int snaplen, res;
unsigned long status = TP_STATUS_USER;
unsigned short macoff, netoff, hdrlen;
struct sk_buff *copy_skb = NULL;
- struct timeval tv;
struct timespec ts;
- struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
+ __u32 ts_status;
+
+ /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
+ * We may add members to them until current aligned size without forcing
+ * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
+ */
+ BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
+ BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@@ -1692,10 +1960,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
* Anyways, moving it for V1/V2 only as V3 doesn't need this
* at packet level.
*/
- if (po->stats.tp_drops)
+ if (po->stats.stats1.tp_drops)
status |= TP_STATUS_LOSING;
}
- po->stats.tp_packets++;
+ po->stats.stats1.tp_packets++;
if (copy_skb) {
status |= TP_STATUS_COPY;
__skb_queue_tail(&sk->sk_receive_queue, copy_skb);
@@ -1704,24 +1972,19 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
+ if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
+ getnstimeofday(&ts);
+
+ status |= ts_status;
+
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 ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- tv = ktime_to_timeval(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- tv = ktime_to_timeval(shhwtstamps->hwtstamp);
- else 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;
+ h.h1->tp_sec = ts.tv_sec;
+ h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
hdrlen = sizeof(*h.h1);
break;
case TPACKET_V2:
@@ -1729,25 +1992,17 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h2->tp_snaplen = snaplen;
h.h2->tp_mac = macoff;
h.h2->tp_net = netoff;
- if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->hwtstamp);
- else 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;
if (vlan_tx_tag_present(skb)) {
h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
- status |= TP_STATUS_VLAN_VALID;
+ h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
+ status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
} else {
h.h2->tp_vlan_tci = 0;
+ h.h2->tp_vlan_tpid = 0;
}
- h.h2->tp_padding = 0;
+ memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
hdrlen = sizeof(*h.h2);
break;
case TPACKET_V3:
@@ -1759,18 +2014,9 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h3->tp_snaplen = snaplen;
h.h3->tp_mac = macoff;
h.h3->tp_net = netoff;
- if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->hwtstamp);
- else if (skb->tstamp.tv64)
- ts = ktime_to_timespec(skb->tstamp);
- else
- getnstimeofday(&ts);
h.h3->tp_sec = ts.tv_sec;
h.h3->tp_nsec = ts.tv_nsec;
+ memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
hdrlen = sizeof(*h.h3);
break;
default:
@@ -1789,25 +2035,26 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
sll->sll_ifindex = dev->ifindex;
smp_mb();
+
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
- {
+ if (po->tp_version <= TPACKET_V2) {
u8 *start, *end;
- if (po->tp_version <= TPACKET_V2) {
- end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
- + macoff + snaplen);
- for (start = h.raw; start < end; start += PAGE_SIZE)
- flush_dcache_page(pgv_to_page(start));
- }
- smp_wmb();
+ end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
+ macoff + snaplen);
+
+ for (start = h.raw; start < end; start += PAGE_SIZE)
+ flush_dcache_page(pgv_to_page(start));
}
+ smp_wmb();
#endif
+
if (po->tp_version <= TPACKET_V2)
__packet_set_status(po, h.raw, status);
else
prb_clear_blk_fill_status(&po->rx_ring);
- sk->sk_data_ready(sk, 0);
+ sk->sk_data_ready(sk);
drop_n_restore:
if (skb_head != skb->data && skb_shared(skb)) {
@@ -1819,10 +2066,10 @@ drop:
return 0;
ring_is_full:
- po->stats.tp_drops++;
+ po->stats.stats1.tp_drops++;
spin_unlock(&sk->sk_receive_queue.lock);
- sk->sk_data_ready(sk, 0);
+ sk->sk_data_ready(sk);
kfree_skb(copy_skb);
goto drop_n_restore;
}
@@ -1830,13 +2077,16 @@ ring_is_full:
static void tpacket_destruct_skb(struct sk_buff *skb)
{
struct packet_sock *po = pkt_sk(skb->sk);
- void *ph;
if (likely(po->tx_ring.pg_vec)) {
+ void *ph;
+ __u32 ts;
+
ph = skb_shinfo(skb)->destructor_arg;
- BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
- atomic_dec(&po->tx_ring.pending);
- __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
+ packet_dec_pending(&po->tx_ring);
+
+ ts = __packet_set_timestamp(po, ph, skb);
+ __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
}
sock_wfree(skb);
@@ -1846,11 +2096,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
void *frame, struct net_device *dev, int size_max,
__be16 proto, unsigned char *addr, int hlen)
{
- union {
- struct tpacket_hdr *h1;
- struct tpacket2_hdr *h2;
- void *raw;
- } ph;
+ union tpacket_uhdr ph;
int to_write, offset, len, tp_len, nr_frags, len_max;
struct socket *sock = po->sk.sk_socket;
struct page *page;
@@ -1863,6 +2109,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
skb->dev = dev;
skb->priority = po->sk.sk_priority;
skb->mark = po->sk.sk_mark;
+ sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags);
skb_shinfo(skb)->destructor_arg = ph.raw;
switch (po->tp_version) {
@@ -1881,7 +2128,9 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
skb_reserve(skb, hlen);
skb_reset_network_header(skb);
- if (po->tp_tx_has_off) {
+ if (!packet_use_direct_xmit(po))
+ skb_probe_transport_header(skb, 0);
+ if (unlikely(po->tp_tx_has_off)) {
int off_min, off_max, off;
off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
off_max = po->tx_ring.frame_size - tp_len;
@@ -1972,10 +2221,10 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
struct sk_buff *skb;
struct net_device *dev;
__be16 proto;
- bool need_rls_dev = false;
int err, reserve = 0;
void *ph;
- struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
+ bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
int tp_len, size_max;
unsigned char *addr;
int len_sum = 0;
@@ -1984,8 +2233,8 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
mutex_lock(&po->pg_vec_lock);
- if (saddr == NULL) {
- dev = po->prot_hook.dev;
+ if (likely(saddr == NULL)) {
+ dev = packet_cached_dev_get(po);
proto = po->num;
addr = NULL;
} else {
@@ -1999,19 +2248,16 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
proto = saddr->sll_protocol;
addr = saddr->sll_addr;
dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
- need_rls_dev = true;
}
err = -ENXIO;
if (unlikely(dev == NULL))
goto out;
-
- reserve = dev->hard_header_len;
-
err = -ENETDOWN;
if (unlikely(!(dev->flags & IFF_UP)))
goto out_put;
+ reserve = dev->hard_header_len + VLAN_HLEN;
size_max = po->tx_ring.frame_size
- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
@@ -2020,10 +2266,10 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
do {
ph = packet_current_frame(po, &po->tx_ring,
- TP_STATUS_SEND_REQUEST);
-
+ TP_STATUS_SEND_REQUEST);
if (unlikely(ph == NULL)) {
- schedule();
+ if (need_wait && need_resched())
+ schedule();
continue;
}
@@ -2038,8 +2284,19 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
goto out_status;
tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
- addr, hlen);
+ addr, hlen);
+ if (tp_len > dev->mtu + dev->hard_header_len) {
+ struct ethhdr *ehdr;
+ /* Earlier code assumed this would be a VLAN pkt,
+ * double-check this now that we have the actual
+ * packet in hand.
+ */
+ skb_reset_mac_header(skb);
+ ehdr = eth_hdr(skb);
+ if (ehdr->h_proto != htons(ETH_P_8021Q))
+ tp_len = -EMSGSIZE;
+ }
if (unlikely(tp_len < 0)) {
if (po->tp_loss) {
__packet_set_status(po, ph,
@@ -2054,12 +2311,14 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
}
}
+ packet_pick_tx_queue(dev, skb);
+
skb->destructor = tpacket_destruct_skb;
__packet_set_status(po, ph, TP_STATUS_SENDING);
- atomic_inc(&po->tx_ring.pending);
+ packet_inc_pending(&po->tx_ring);
status = TP_STATUS_SEND_REQUEST;
- err = dev_queue_xmit(skb);
+ err = po->xmit(skb);
if (unlikely(err > 0)) {
err = net_xmit_errno(err);
if (err && __packet_get_status(po, ph) ==
@@ -2077,9 +2336,13 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
packet_increment_head(&po->tx_ring);
len_sum += tp_len;
} while (likely((ph != NULL) ||
- ((!(msg->msg_flags & MSG_DONTWAIT)) &&
- (atomic_read(&po->tx_ring.pending))))
- );
+ /* Note: packet_read_pending() might be slow if we have
+ * to call it as it's per_cpu variable, but in fast-path
+ * we already short-circuit the loop with the first
+ * condition, and luckily don't have to go that path
+ * anyway.
+ */
+ (need_wait && packet_read_pending(&po->tx_ring))));
err = len_sum;
goto out_put;
@@ -2088,8 +2351,7 @@ out_status:
__packet_set_status(po, ph, status);
kfree_skb(skb);
out_put:
- if (need_rls_dev)
- dev_put(dev);
+ dev_put(dev);
out:
mutex_unlock(&po->pg_vec_lock);
return err;
@@ -2107,7 +2369,7 @@ static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
linear = len;
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
- err);
+ err, 0);
if (!skb)
return NULL;
@@ -2119,15 +2381,13 @@ static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
return skb;
}
-static int packet_snd(struct socket *sock,
- struct msghdr *msg, size_t len)
+static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
- struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
struct sk_buff *skb;
struct net_device *dev;
__be16 proto;
- bool need_rls_dev = false;
unsigned char *addr;
int err, reserve = 0;
struct virtio_net_hdr vnet_hdr = { 0 };
@@ -2142,8 +2402,8 @@ static int packet_snd(struct socket *sock,
* Get and verify the address.
*/
- if (saddr == NULL) {
- dev = po->prot_hook.dev;
+ if (likely(saddr == NULL)) {
+ dev = packet_cached_dev_get(po);
proto = po->num;
addr = NULL;
} else {
@@ -2155,19 +2415,17 @@ static int packet_snd(struct socket *sock,
proto = saddr->sll_protocol;
addr = saddr->sll_addr;
dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
- need_rls_dev = true;
}
err = -ENXIO;
- if (dev == NULL)
+ if (unlikely(dev == NULL))
goto out_unlock;
- if (sock->type == SOCK_RAW)
- reserve = dev->hard_header_len;
-
err = -ENETDOWN;
- if (!(dev->flags & IFF_UP))
+ if (unlikely(!(dev->flags & IFF_UP)))
goto out_unlock;
+ if (sock->type == SOCK_RAW)
+ reserve = dev->hard_header_len;
if (po->has_vnet_hdr) {
vnet_hdr_len = sizeof(vnet_hdr);
@@ -2247,9 +2505,8 @@ static int packet_snd(struct socket *sock,
err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
if (err)
goto out_free;
- err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
- if (err < 0)
- goto out_free;
+
+ sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
if (!gso_type && (len > dev->mtu + reserve + extra_len)) {
/* Earlier code assumed this would be a VLAN pkt,
@@ -2270,6 +2527,8 @@ static int packet_snd(struct socket *sock,
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
+ packet_pick_tx_queue(dev, skb);
+
if (po->has_vnet_hdr) {
if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
@@ -2289,26 +2548,23 @@ static int packet_snd(struct socket *sock,
len += vnet_hdr_len;
}
+ if (!packet_use_direct_xmit(po))
+ skb_probe_transport_header(skb, reserve);
if (unlikely(extra_len == 4))
skb->no_fcs = 1;
- /*
- * Now send it
- */
-
- err = dev_queue_xmit(skb);
+ err = po->xmit(skb);
if (err > 0 && (err = net_xmit_errno(err)) != 0)
goto out_unlock;
- if (need_rls_dev)
- dev_put(dev);
+ dev_put(dev);
return len;
out_free:
kfree_skb(skb);
out_unlock:
- if (dev && need_rls_dev)
+ if (dev)
dev_put(dev);
out:
return err;
@@ -2319,6 +2575,7 @@ static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
{
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
+
if (po->tx_ring.pg_vec)
return tpacket_snd(po, msg);
else
@@ -2353,6 +2610,8 @@ static int packet_release(struct socket *sock)
spin_lock(&po->bind_lock);
unregister_prot_hook(sk, false);
+ packet_cached_dev_reset(po);
+
if (po->prot_hook.dev) {
dev_put(po->prot_hook.dev);
po->prot_hook.dev = NULL;
@@ -2361,13 +2620,15 @@ static int packet_release(struct socket *sock)
packet_flush_mclist(sk);
- memset(&req_u, 0, sizeof(req_u));
-
- if (po->rx_ring.pg_vec)
+ if (po->rx_ring.pg_vec) {
+ memset(&req_u, 0, sizeof(req_u));
packet_set_ring(sk, &req_u, 1, 0);
+ }
- if (po->tx_ring.pg_vec)
+ if (po->tx_ring.pg_vec) {
+ memset(&req_u, 0, sizeof(req_u));
packet_set_ring(sk, &req_u, 1, 1);
+ }
fanout_release(sk);
@@ -2381,6 +2642,7 @@ static int packet_release(struct socket *sock)
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
+ packet_free_pending(po);
sk_refcnt_debug_release(sk);
sock_put(sk);
@@ -2391,9 +2653,12 @@ static int packet_release(struct socket *sock)
* Attach a packet hook.
*/
-static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
+static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 proto)
{
struct packet_sock *po = pkt_sk(sk);
+ const struct net_device *dev_curr;
+ __be16 proto_curr;
+ bool need_rehook;
if (po->fanout) {
if (dev)
@@ -2403,18 +2668,29 @@ static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protoc
}
lock_sock(sk);
-
spin_lock(&po->bind_lock);
- unregister_prot_hook(sk, true);
- po->num = protocol;
- po->prot_hook.type = protocol;
- if (po->prot_hook.dev)
- dev_put(po->prot_hook.dev);
- po->prot_hook.dev = dev;
- po->ifindex = dev ? dev->ifindex : 0;
+ proto_curr = po->prot_hook.type;
+ dev_curr = po->prot_hook.dev;
+
+ need_rehook = proto_curr != proto || dev_curr != dev;
+
+ if (need_rehook) {
+ unregister_prot_hook(sk, true);
+
+ po->num = proto;
+ po->prot_hook.type = proto;
+
+ if (po->prot_hook.dev)
+ dev_put(po->prot_hook.dev);
+
+ po->prot_hook.dev = dev;
- if (protocol == 0)
+ po->ifindex = dev ? dev->ifindex : 0;
+ packet_cached_dev_assign(po, dev);
+ }
+
+ if (proto == 0 || !need_rehook)
goto out_unlock;
if (!dev || (dev->flags & IFF_UP)) {
@@ -2526,6 +2802,13 @@ static int packet_create(struct net *net, struct socket *sock, int protocol,
po = pkt_sk(sk);
sk->sk_family = PF_PACKET;
po->num = proto;
+ po->xmit = dev_queue_xmit;
+
+ err = packet_alloc_pending(po);
+ if (err)
+ goto out2;
+
+ packet_cached_dev_reset(po);
sk->sk_destruct = packet_sock_destruct;
sk_refcnt_debug_inc(sk);
@@ -2557,51 +2840,8 @@ static int packet_create(struct net *net, struct socket *sock, int protocol,
preempt_enable();
return 0;
-out:
- return err;
-}
-
-static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
-{
- struct sock_exterr_skb *serr;
- struct sk_buff *skb, *skb2;
- int copied, err;
-
- err = -EAGAIN;
- skb = skb_dequeue(&sk->sk_error_queue);
- if (skb == NULL)
- goto out;
-
- copied = skb->len;
- if (copied > len) {
- msg->msg_flags |= MSG_TRUNC;
- copied = len;
- }
- err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- if (err)
- goto out_free_skb;
-
- sock_recv_timestamp(msg, sk, skb);
-
- serr = SKB_EXT_ERR(skb);
- put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
- sizeof(serr->ee), &serr->ee);
-
- msg->msg_flags |= MSG_ERRQUEUE;
- err = copied;
-
- /* Reset and regenerate socket error */
- spin_lock_bh(&sk->sk_error_queue.lock);
- sk->sk_err = 0;
- if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
- sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
- spin_unlock_bh(&sk->sk_error_queue.lock);
- sk->sk_error_report(sk);
- } else
- spin_unlock_bh(&sk->sk_error_queue.lock);
-
-out_free_skb:
- kfree_skb(skb);
+out2:
+ sk_free(sk);
out:
return err;
}
@@ -2617,7 +2857,6 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied, err;
- struct sockaddr_ll *sll;
int vnet_hdr_len = 0;
err = -EINVAL;
@@ -2631,7 +2870,8 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
#endif
if (flags & MSG_ERRQUEUE) {
- err = packet_recv_error(sk, msg, len);
+ err = sock_recv_errqueue(sk, msg, len,
+ SOL_PACKET, PACKET_TX_TIMESTAMP);
goto out;
}
@@ -2700,22 +2940,10 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
goto out_free;
}
- /*
- * If the address length field is there to be filled in, we fill
- * it in now.
- */
-
- sll = &PACKET_SKB_CB(skb)->sa.ll;
- if (sock->type == SOCK_PACKET)
- msg->msg_namelen = sizeof(struct sockaddr_pkt);
- else
- msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
-
- /*
- * You lose any data beyond the buffer you gave. If it worries a
- * user program they can ask the device for its MTU anyway.
+ /* You lose any data beyond the buffer you gave. If it worries
+ * a user program they can ask the device for its MTU
+ * anyway.
*/
-
copied = skb->len;
if (copied > len) {
copied = len;
@@ -2728,9 +2956,21 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
sock_recv_ts_and_drops(msg, sk, skb);
- if (msg->msg_name)
+ if (msg->msg_name) {
+ /* If the address length field is there to be filled
+ * in, we fill it in now.
+ */
+ if (sock->type == SOCK_PACKET) {
+ __sockaddr_check_size(sizeof(struct sockaddr_pkt));
+ msg->msg_namelen = sizeof(struct sockaddr_pkt);
+ } else {
+ struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
+ msg->msg_namelen = sll->sll_halen +
+ offsetof(struct sockaddr_ll, sll_addr);
+ }
memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
msg->msg_namelen);
+ }
if (pkt_sk(sk)->auxdata) {
struct tpacket_auxdata aux;
@@ -2744,11 +2984,12 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
aux.tp_net = skb_network_offset(skb);
if (vlan_tx_tag_present(skb)) {
aux.tp_vlan_tci = vlan_tx_tag_get(skb);
- aux.tp_status |= TP_STATUS_VLAN_VALID;
+ aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
+ aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
} else {
aux.tp_vlan_tci = 0;
+ aux.tp_vlan_tpid = 0;
}
- aux.tp_padding = 0;
put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
}
@@ -2774,12 +3015,11 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
return -EOPNOTSUPP;
uaddr->sa_family = AF_PACKET;
+ memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
rcu_read_lock();
dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
if (dev)
- strncpy(uaddr->sa_data, dev->name, 14);
- else
- memset(uaddr->sa_data, 0, 14);
+ strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
rcu_read_unlock();
*uaddr_len = sizeof(*uaddr);
@@ -3150,6 +3390,18 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
po->tp_tx_has_off = !!val;
return 0;
}
+ case PACKET_QDISC_BYPASS:
+ {
+ int val;
+
+ if (optlen != sizeof(val))
+ return -EINVAL;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+
+ po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
+ return 0;
+ }
default:
return -ENOPROTOOPT;
}
@@ -3163,8 +3415,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
void *data = &val;
- struct tpacket_stats st;
- union tpacket_stats_u st_u;
+ union tpacket_stats_u st;
if (level != SOL_PACKET)
return -ENOPROTOOPT;
@@ -3178,22 +3429,20 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
switch (optname) {
case PACKET_STATISTICS:
spin_lock_bh(&sk->sk_receive_queue.lock);
+ memcpy(&st, &po->stats, sizeof(st));
+ memset(&po->stats, 0, sizeof(po->stats));
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
if (po->tp_version == TPACKET_V3) {
lv = sizeof(struct tpacket_stats_v3);
- memcpy(&st_u.stats3, &po->stats,
- sizeof(struct tpacket_stats));
- st_u.stats3.tp_freeze_q_cnt =
- po->stats_u.stats3.tp_freeze_q_cnt;
- st_u.stats3.tp_packets += po->stats.tp_drops;
- data = &st_u.stats3;
+ st.stats3.tp_packets += st.stats3.tp_drops;
+ data = &st.stats3;
} else {
lv = sizeof(struct tpacket_stats);
- st = po->stats;
- st.tp_packets += st.tp_drops;
- data = &st;
+ st.stats1.tp_packets += st.stats1.tp_drops;
+ data = &st.stats1;
}
- memset(&po->stats, 0, sizeof(st));
- spin_unlock_bh(&sk->sk_receive_queue.lock);
+
break;
case PACKET_AUXDATA:
val = po->auxdata;
@@ -3238,12 +3487,16 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
case PACKET_FANOUT:
val = (po->fanout ?
((u32)po->fanout->id |
- ((u32)po->fanout->type << 16)) :
+ ((u32)po->fanout->type << 16) |
+ ((u32)po->fanout->flags << 24)) :
0);
break;
case PACKET_TX_HAS_OFF:
val = po->tp_tx_has_off;
break;
+ case PACKET_QDISC_BYPASS:
+ val = packet_use_direct_xmit(po);
+ break;
default:
return -ENOPROTOOPT;
}
@@ -3258,15 +3511,15 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
}
-static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
+static int packet_notifier(struct notifier_block *this,
+ unsigned long msg, void *ptr)
{
struct sock *sk;
- struct hlist_node *node;
- struct net_device *dev = data;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net *net = dev_net(dev);
rcu_read_lock();
- sk_for_each_rcu(sk, node, &net->packet.sklist) {
+ sk_for_each_rcu(sk, &net->packet.sklist) {
struct packet_sock *po = pkt_sk(sk);
switch (msg) {
@@ -3285,6 +3538,7 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void
sk->sk_error_report(sk);
}
if (msg == NETDEV_UNREGISTER) {
+ packet_cached_dev_reset(po);
po->ifindex = -1;
if (po->prot_hook.dev)
dev_put(po->prot_hook.dev);
@@ -3434,34 +3688,26 @@ static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
static char *alloc_one_pg_vec_page(unsigned long order)
{
- char *buffer = NULL;
+ char *buffer;
gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
__GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
buffer = (char *) __get_free_pages(gfp_flags, order);
-
if (buffer)
return buffer;
- /*
- * __get_free_pages failed, fall back to vmalloc
- */
+ /* __get_free_pages failed, fall back to vmalloc */
buffer = vzalloc((1 << order) * PAGE_SIZE);
-
if (buffer)
return buffer;
- /*
- * vmalloc failed, lets dig into swap here
- */
+ /* vmalloc failed, lets dig into swap here */
gfp_flags &= ~__GFP_NORETRY;
- buffer = (char *)__get_free_pages(gfp_flags, order);
+ buffer = (char *) __get_free_pages(gfp_flags, order);
if (buffer)
return buffer;
- /*
- * complete and utter failure
- */
+ /* complete and utter failure */
return NULL;
}
@@ -3516,7 +3762,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
if (!closing) {
if (atomic_read(&po->mapped))
goto out;
- if (atomic_read(&rb->pending))
+ if (packet_read_pending(rb))
goto out;
}
@@ -3568,7 +3814,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
*/
if (!tx_ring)
init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
- break;
+ break;
default:
break;
}
@@ -3826,7 +4072,7 @@ static int __net_init packet_net_init(struct net *net)
mutex_init(&net->packet.sklist_lock);
INIT_HLIST_HEAD(&net->packet.sklist);
- if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
+ if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
return -ENOMEM;
return 0;
@@ -3834,7 +4080,7 @@ static int __net_init packet_net_init(struct net *net)
static void __net_exit packet_net_exit(struct net *net)
{
- proc_net_remove(net, "packet");
+ remove_proc_entry("packet", net->proc_net);
}
static struct pernet_operations packet_net_ops = {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:40:15 +0000