From 16dff91804777efbb0ce18b0a7e54c55e86b7beb Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 21 May 2010 22:18:34 +0000 Subject: net/can: Use memdup_user Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // Signed-off-by: Julia Lawall Signed-off-by: David S. Miller --- net/can/raw.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) (limited to 'net/can/raw.c') diff --git a/net/can/raw.c b/net/can/raw.c index da99cf153b3..ccfe633eec8 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -436,14 +436,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (count > 1) { /* filter does not fit into dfilter => alloc space */ - filter = kmalloc(optlen, GFP_KERNEL); - if (!filter) - return -ENOMEM; - - if (copy_from_user(filter, optval, optlen)) { - kfree(filter); - return -EFAULT; - } + filter = memdup_user(optval, optlen); + if (IS_ERR(filter)) + return PTR_ERR(filter); } else if (count == 1) { if (copy_from_user(&sfilter, optval, sizeof(sfilter))) return -EFAULT; -- cgit v1.2.3-70-g09d2 From cff0d6e6edac7672b3f915bb4fb59f279243b7f9 Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Tue, 3 Aug 2010 00:31:48 -0700 Subject: can-raw: Fix skb_orphan_try handling Commit fc6055a5ba31e2c14e36e8939f9bf2b6d586a7f5 (net: Introduce skb_orphan_try()) allows an early orphan of the skb and takes care on tx timestamping, which needs the sk-reference in the skb on driver level. So does the can-raw socket, which has not been taken into account here. The patch below adds a 'prevent_sk_orphan' bit in the skb tx shared info, which fixes the problem discovered by Matthias Fuchs here: http://marc.info/?t=128030411900003&r=1&w=2 Even if it's not a primary tx timestamp topic it fits well into some skb shared tx context. Or should be find a different place for the information to protect the sk reference until it reaches the driver level? Signed-off-by: Oliver Hartkopp Signed-off-by: David S. Miller --- include/linux/skbuff.h | 4 +++- net/can/raw.c | 4 ++++ 2 files changed, 7 insertions(+), 1 deletion(-) (limited to 'net/can/raw.c') diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index d89876b806a..d20d9e7a9bb 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -169,6 +169,7 @@ struct skb_shared_hwtstamps { * @software: generate software time stamp * @in_progress: device driver is going to provide * hardware time stamp + * @prevent_sk_orphan: make sk reference available on driver level * @flags: all shared_tx flags * * These flags are attached to packets as part of the @@ -178,7 +179,8 @@ union skb_shared_tx { struct { __u8 hardware:1, software:1, - in_progress:1; + in_progress:1, + prevent_sk_orphan:1; }; __u8 flags; }; diff --git a/net/can/raw.c b/net/can/raw.c index ccfe633eec8..a10e3338f08 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -650,6 +650,10 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, err = sock_tx_timestamp(msg, sk, skb_tx(skb)); if (err < 0) goto free_skb; + + /* to be able to check the received tx sock reference in raw_rcv() */ + skb_tx(skb)->prevent_sk_orphan = 1; + skb->dev = dev; skb->sk = sk; -- cgit v1.2.3-70-g09d2 From 2244d07bfa2097cb00600da91c715a8aa547917e Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Tue, 17 Aug 2010 08:59:14 +0000 Subject: net: simplify flags for tx timestamping This patch removes the abstraction introduced by the union skb_shared_tx in the shared skb data. The access of the different union elements at several places led to some confusion about accessing the shared tx_flags e.g. in skb_orphan_try(). http://marc.info/?l=linux-netdev&m=128084897415886&w=2 Signed-off-by: Oliver Hartkopp Signed-off-by: David S. Miller --- Documentation/networking/timestamping.txt | 22 +++++++++------- drivers/net/bfin_mac.c | 10 +++---- drivers/net/gianfar.c | 15 +++++------ drivers/net/igb/igb.h | 2 +- drivers/net/igb/igb_main.c | 11 ++++---- include/linux/skbuff.h | 44 +++++++++++-------------------- include/net/ip.h | 2 +- include/net/sock.h | 8 ++---- net/can/raw.c | 4 +-- net/core/dev.c | 6 ++--- net/core/skbuff.c | 2 +- net/ipv4/icmp.c | 4 +-- net/ipv4/ip_output.c | 6 ++--- net/ipv4/raw.c | 2 +- net/ipv4/udp.c | 4 +-- net/packet/af_packet.c | 4 +-- net/socket.c | 9 +++---- 17 files changed, 68 insertions(+), 87 deletions(-) (limited to 'net/can/raw.c') diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt index e8c8f4f06c6..98097d8cb91 100644 --- a/Documentation/networking/timestamping.txt +++ b/Documentation/networking/timestamping.txt @@ -172,15 +172,19 @@ struct skb_shared_hwtstamps { }; Time stamps for outgoing packets are to be generated as follows: -- In hard_start_xmit(), check if skb_tx(skb)->hardware is set no-zero. - If yes, then the driver is expected to do hardware time stamping. +- In hard_start_xmit(), check if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) + is set no-zero. If yes, then the driver is expected to do hardware time + stamping. - If this is possible for the skb and requested, then declare - that the driver is doing the time stamping by setting the field - skb_tx(skb)->in_progress non-zero. You might want to keep a pointer - to the associated skb for the next step and not free the skb. A driver - not supporting hardware time stamping doesn't do that. A driver must - never touch sk_buff::tstamp! It is used to store software generated - time stamps by the network subsystem. + that the driver is doing the time stamping by setting the flag + SKBTX_IN_PROGRESS in skb_shinfo(skb)->tx_flags , e.g. with + + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; + + You might want to keep a pointer to the associated skb for the next step + and not free the skb. A driver not supporting hardware time stamping doesn't + do that. A driver must never touch sk_buff::tstamp! It is used to store + software generated time stamps by the network subsystem. - As soon as the driver has sent the packet and/or obtained a hardware time stamp for it, it passes the time stamp back by calling skb_hwtstamp_tx() with the original skb, the raw @@ -191,6 +195,6 @@ Time stamps for outgoing packets are to be generated as follows: this would occur at a later time in the processing pipeline than other software time stamping and therefore could lead to unexpected deltas between time stamps. -- If the driver did not call set skb_tx(skb)->in_progress, then +- If the driver did not set the SKBTX_IN_PROGRESS flag (see above), then dev_hard_start_xmit() checks whether software time stamping is wanted as fallback and potentially generates the time stamp. diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c index 012613fde3f..7a0e4156fad 100644 --- a/drivers/net/bfin_mac.c +++ b/drivers/net/bfin_mac.c @@ -803,15 +803,14 @@ static void bfin_dump_hwtamp(char *s, ktime_t *hw, ktime_t *ts, struct timecompa static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb) { struct bfin_mac_local *lp = netdev_priv(netdev); - union skb_shared_tx *shtx = skb_tx(skb); - if (shtx->hardware) { + if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { int timeout_cnt = MAX_TIMEOUT_CNT; /* When doing time stamping, keep the connection to the socket * a while longer */ - shtx->in_progress = 1; + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; /* * The timestamping is done at the EMAC module's MII/RMII interface @@ -991,7 +990,6 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb, struct bfin_mac_local *lp = netdev_priv(dev); u16 *data; u32 data_align = (unsigned long)(skb->data) & 0x3; - union skb_shared_tx *shtx = skb_tx(skb); current_tx_ptr->skb = skb; @@ -1005,7 +1003,7 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb, * of this field are the length of the packet payload in bytes and the higher * 4 bits are the timestamping enable field. */ - if (shtx->hardware) + if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) *data |= 0x1000; current_tx_ptr->desc_a.start_addr = (u32)data; @@ -1015,7 +1013,7 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb, } else { *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len); /* enable timestamping for the sent packet */ - if (shtx->hardware) + if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) *((u16 *)(current_tx_ptr->packet)) |= 0x1000; memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data, skb->len); diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c index 3d9f958ebd2..e6048d6ab0e 100644 --- a/drivers/net/gianfar.c +++ b/drivers/net/gianfar.c @@ -2048,7 +2048,6 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev) u32 bufaddr; unsigned long flags; unsigned int nr_frags, nr_txbds, length; - union skb_shared_tx *shtx; /* * TOE=1 frames larger than 2500 bytes may see excess delays @@ -2069,10 +2068,10 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev) txq = netdev_get_tx_queue(dev, rq); base = tx_queue->tx_bd_base; regs = tx_queue->grp->regs; - shtx = skb_tx(skb); /* check if time stamp should be generated */ - if (unlikely(shtx->hardware && priv->hwts_tx_en)) + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP && + priv->hwts_tx_en)) do_tstamp = 1; /* make space for additional header when fcb is needed */ @@ -2174,7 +2173,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev) /* Setup tx hardware time stamping if requested */ if (unlikely(do_tstamp)) { - shtx->in_progress = 1; + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; if (fcb == NULL) fcb = gfar_add_fcb(skb); fcb->ptp = 1; @@ -2446,7 +2445,6 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) int howmany = 0; u32 lstatus; size_t buflen; - union skb_shared_tx *shtx; rx_queue = priv->rx_queue[tx_queue->qindex]; bdp = tx_queue->dirty_tx; @@ -2461,8 +2459,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) * When time stamping, one additional TxBD must be freed. * Also, we need to dma_unmap_single() the TxPAL. */ - shtx = skb_tx(skb); - if (unlikely(shtx->in_progress)) + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) nr_txbds = frags + 2; else nr_txbds = frags + 1; @@ -2476,7 +2473,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) (lstatus & BD_LENGTH_MASK)) break; - if (unlikely(shtx->in_progress)) { + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) { next = next_txbd(bdp, base, tx_ring_size); buflen = next->length + GMAC_FCB_LEN; } else @@ -2485,7 +2482,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue) dma_unmap_single(&priv->ofdev->dev, bdp->bufPtr, buflen, DMA_TO_DEVICE); - if (unlikely(shtx->in_progress)) { + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) { struct skb_shared_hwtstamps shhwtstamps; u64 *ns = (u64*) (((u32)skb->data + 0x10) & ~0x7); memset(&shhwtstamps, 0, sizeof(shhwtstamps)); diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h index 6e63d9a7fc7..44e0ff1494e 100644 --- a/drivers/net/igb/igb.h +++ b/drivers/net/igb/igb.h @@ -143,7 +143,7 @@ struct igb_buffer { u16 next_to_watch; unsigned int bytecount; u16 gso_segs; - union skb_shared_tx shtx; + u8 tx_flags; u8 mapped_as_page; }; /* RX */ diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 9b4e5895f5f..985e37cf17b 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -3954,7 +3954,7 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb, } tx_ring->buffer_info[i].skb = skb; - tx_ring->buffer_info[i].shtx = skb_shinfo(skb)->tx_flags; + tx_ring->buffer_info[i].tx_flags = skb_shinfo(skb)->tx_flags; /* multiply data chunks by size of headers */ tx_ring->buffer_info[i].bytecount = ((gso_segs - 1) * hlen) + skb->len; tx_ring->buffer_info[i].gso_segs = gso_segs; @@ -4088,7 +4088,6 @@ netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb, u32 tx_flags = 0; u16 first; u8 hdr_len = 0; - union skb_shared_tx *shtx = skb_tx(skb); /* need: 1 descriptor per page, * + 2 desc gap to keep tail from touching head, @@ -4100,8 +4099,8 @@ netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb, return NETDEV_TX_BUSY; } - if (unlikely(shtx->hardware)) { - shtx->in_progress = 1; + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) { + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; tx_flags |= IGB_TX_FLAGS_TSTAMP; } @@ -5319,7 +5318,7 @@ static void igb_tx_hwtstamp(struct igb_q_vector *q_vector, struct igb_buffer *bu u64 regval; /* if skb does not support hw timestamp or TX stamp not valid exit */ - if (likely(!buffer_info->shtx.hardware) || + if (likely(!(buffer_info->tx_flags & SKBTX_HW_TSTAMP)) || !(rd32(E1000_TSYNCTXCTL) & E1000_TSYNCTXCTL_VALID)) return; @@ -5500,7 +5499,7 @@ static void igb_rx_hwtstamp(struct igb_q_vector *q_vector, u32 staterr, * values must belong to this one here and therefore we don't need to * compare any of the additional attributes stored for it. * - * If nothing went wrong, then it should have a skb_shared_tx that we + * If nothing went wrong, then it should have a shared tx_flags that we * can turn into a skb_shared_hwtstamps. */ if (staterr & E1000_RXDADV_STAT_TSIP) { diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index d8050382b18..f067c95cf18 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -163,26 +163,19 @@ struct skb_shared_hwtstamps { ktime_t syststamp; }; -/** - * struct skb_shared_tx - instructions for time stamping of outgoing packets - * @hardware: generate hardware time stamp - * @software: generate software time stamp - * @in_progress: device driver is going to provide - * hardware time stamp - * @prevent_sk_orphan: make sk reference available on driver level - * @flags: all shared_tx flags - * - * These flags are attached to packets as part of the - * &skb_shared_info. Use skb_tx() to get a pointer. - */ -union skb_shared_tx { - struct { - __u8 hardware:1, - software:1, - in_progress:1, - prevent_sk_orphan:1; - }; - __u8 flags; +/* Definitions for tx_flags in struct skb_shared_info */ +enum { + /* generate hardware time stamp */ + SKBTX_HW_TSTAMP = 1 << 0, + + /* generate software time stamp */ + SKBTX_SW_TSTAMP = 1 << 1, + + /* device driver is going to provide hardware time stamp */ + SKBTX_IN_PROGRESS = 1 << 2, + + /* ensure the originating sk reference is available on driver level */ + SKBTX_DRV_NEEDS_SK_REF = 1 << 3, }; /* This data is invariant across clones and lives at @@ -195,7 +188,7 @@ struct skb_shared_info { unsigned short gso_segs; unsigned short gso_type; __be32 ip6_frag_id; - union skb_shared_tx tx_flags; + __u8 tx_flags; struct sk_buff *frag_list; struct skb_shared_hwtstamps hwtstamps; @@ -587,11 +580,6 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) return &skb_shinfo(skb)->hwtstamps; } -static inline union skb_shared_tx *skb_tx(struct sk_buff *skb) -{ - return &skb_shinfo(skb)->tx_flags; -} - /** * skb_queue_empty - check if a queue is empty * @list: queue head @@ -1996,8 +1984,8 @@ extern void skb_tstamp_tx(struct sk_buff *orig_skb, static inline void sw_tx_timestamp(struct sk_buff *skb) { - union skb_shared_tx *shtx = skb_tx(skb); - if (shtx->software && !shtx->in_progress) + if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP && + !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) skb_tstamp_tx(skb, NULL); } diff --git a/include/net/ip.h b/include/net/ip.h index 890f9725d68..7691aca133d 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -53,7 +53,7 @@ struct ipcm_cookie { __be32 addr; int oif; struct ip_options *opt; - union skb_shared_tx shtx; + __u8 tx_flags; }; #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) diff --git a/include/net/sock.h b/include/net/sock.h index ac53bfbdfe1..100e43bf95f 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1669,17 +1669,13 @@ static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, /** * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped - * @msg: outgoing packet * @sk: socket sending this packet - * @shtx: filled with instructions for time stamping + * @tx_flags: filled with instructions for time stamping * * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if * parameters are invalid. */ -extern int sock_tx_timestamp(struct msghdr *msg, - struct sock *sk, - union skb_shared_tx *shtx); - +extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); /** * sk_eat_skb - Release a skb if it is no longer needed diff --git a/net/can/raw.c b/net/can/raw.c index a10e3338f08..7d77e67e57a 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -647,12 +647,12 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); if (err < 0) goto free_skb; - err = sock_tx_timestamp(msg, sk, skb_tx(skb)); + err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); if (err < 0) goto free_skb; /* to be able to check the received tx sock reference in raw_rcv() */ - skb_tx(skb)->prevent_sk_orphan = 1; + skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; skb->dev = dev; skb->sk = sk; diff --git a/net/core/dev.c b/net/core/dev.c index 586a11cb439..c1dc8a95f6f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1902,14 +1902,14 @@ static int dev_gso_segment(struct sk_buff *skb) /* * Try to orphan skb early, right before transmission by the device. - * We cannot orphan skb if tx timestamp is requested, since - * drivers need to call skb_tstamp_tx() to send the timestamp. + * We cannot orphan skb if tx timestamp is requested or the sk-reference + * is needed on driver level for other reasons, e.g. see net/can/raw.c */ static inline void skb_orphan_try(struct sk_buff *skb) { struct sock *sk = skb->sk; - if (sk && !skb_tx(skb)->flags) { + if (sk && !skb_shinfo(skb)->tx_flags) { /* skb_tx_hash() wont be able to get sk. * We copy sk_hash into skb->rxhash */ diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 3a2513f0d0c..99ef721f773 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3016,7 +3016,7 @@ void skb_tstamp_tx(struct sk_buff *orig_skb, } else { /* * no hardware time stamps available, - * so keep the skb_shared_tx and only + * so keep the shared tx_flags and only * store software time stamp */ skb->tstamp = ktime_get_real(); diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index a0d847c7cba..96bc7f9475a 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -379,7 +379,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb) inet->tos = ip_hdr(skb)->tos; daddr = ipc.addr = rt->rt_src; ipc.opt = NULL; - ipc.shtx.flags = 0; + ipc.tx_flags = 0; if (icmp_param->replyopts.optlen) { ipc.opt = &icmp_param->replyopts; if (ipc.opt->srr) @@ -538,7 +538,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) inet_sk(sk)->tos = tos; ipc.addr = iph->saddr; ipc.opt = &icmp_param.replyopts; - ipc.shtx.flags = 0; + ipc.tx_flags = 0; { struct flowi fl = { diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 04b69896df5..e807492f177 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -953,7 +953,7 @@ alloc_new_skb: else /* only the initial fragment is time stamped */ - ipc->shtx.flags = 0; + ipc->tx_flags = 0; } if (skb == NULL) goto error; @@ -964,7 +964,7 @@ alloc_new_skb: skb->ip_summed = csummode; skb->csum = 0; skb_reserve(skb, hh_len); - *skb_tx(skb) = ipc->shtx; + skb_shinfo(skb)->tx_flags = ipc->tx_flags; /* * Find where to start putting bytes. @@ -1384,7 +1384,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar daddr = ipc.addr = rt->rt_src; ipc.opt = NULL; - ipc.shtx.flags = 0; + ipc.tx_flags = 0; if (replyopts.opt.optlen) { ipc.opt = &replyopts.opt; diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 009a7b2aa1e..1f85ef28989 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -505,7 +505,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, ipc.addr = inet->inet_saddr; ipc.opt = NULL; - ipc.shtx.flags = 0; + ipc.tx_flags = 0; ipc.oif = sk->sk_bound_dev_if; if (msg->msg_controllen) { diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 32e0bef60d0..86e757e162e 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -797,7 +797,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, return -EOPNOTSUPP; ipc.opt = NULL; - ipc.shtx.flags = 0; + ipc.tx_flags = 0; if (up->pending) { /* @@ -845,7 +845,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, ipc.addr = inet->inet_saddr; ipc.oif = sk->sk_bound_dev_if; - err = sock_tx_timestamp(msg, sk, &ipc.shtx); + err = sock_tx_timestamp(sk, &ipc.tx_flags); if (err) return err; if (msg->msg_controllen) { diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 9a17f28b125..3616f27b9d4 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -488,7 +488,7 @@ retry: skb->dev = dev; skb->priority = sk->sk_priority; skb->mark = sk->sk_mark; - err = sock_tx_timestamp(msg, sk, skb_tx(skb)); + err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); if (err < 0) goto out_unlock; @@ -1209,7 +1209,7 @@ 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(msg, sk, skb_tx(skb)); + err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); if (err < 0) goto out_free; diff --git a/net/socket.c b/net/socket.c index 2270b941bcc..7848d12f5e4 100644 --- a/net/socket.c +++ b/net/socket.c @@ -535,14 +535,13 @@ void sock_release(struct socket *sock) } EXPORT_SYMBOL(sock_release); -int sock_tx_timestamp(struct msghdr *msg, struct sock *sk, - union skb_shared_tx *shtx) +int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags) { - shtx->flags = 0; + *tx_flags = 0; if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) - shtx->hardware = 1; + *tx_flags |= SKBTX_HW_TSTAMP; if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) - shtx->software = 1; + *tx_flags |= SKBTX_SW_TSTAMP; return 0; } EXPORT_SYMBOL(sock_tx_timestamp); -- cgit v1.2.3-70-g09d2 From 1e55659ce6ddb5247cee0b1f720d77a799902b85 Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Tue, 19 Oct 2010 09:32:04 +0000 Subject: can-raw: add msg_flags to distinguish local traffic CAN has no addressing scheme. It is currently impossible for userspace to tell is a received CAN frame comes from another process on the local host, or from a remote CAN device. This patch add support for userspace applications to distinguish between 'own', 'local' and 'remote' CAN traffic. The distinction is made by returning flags in msg->msg_flags in the call to recvmsg(). The added documentation explains the introduced flags. Signed-off-by: Kurt Van Dijck Signed-off-by: Oliver Hartkopp Signed-off-by: David S. Miller --- Documentation/networking/can.txt | 12 ++++++++++++ net/can/raw.c | 33 ++++++++++++++++++++++++++++++--- 2 files changed, 42 insertions(+), 3 deletions(-) (limited to 'net/can/raw.c') diff --git a/Documentation/networking/can.txt b/Documentation/networking/can.txt index cd79735013f..5b04b67ddca 100644 --- a/Documentation/networking/can.txt +++ b/Documentation/networking/can.txt @@ -22,6 +22,7 @@ This file contains 4.1.2 RAW socket option CAN_RAW_ERR_FILTER 4.1.3 RAW socket option CAN_RAW_LOOPBACK 4.1.4 RAW socket option CAN_RAW_RECV_OWN_MSGS + 4.1.5 RAW socket returned message flags 4.2 Broadcast Manager protocol sockets (SOCK_DGRAM) 4.3 connected transport protocols (SOCK_SEQPACKET) 4.4 unconnected transport protocols (SOCK_DGRAM) @@ -471,6 +472,17 @@ solution for a couple of reasons: setsockopt(s, SOL_CAN_RAW, CAN_RAW_RECV_OWN_MSGS, &recv_own_msgs, sizeof(recv_own_msgs)); + 4.1.5 RAW socket returned message flags + + When using recvmsg() call, the msg->msg_flags may contain following flags: + + MSG_DONTROUTE: set when the received frame was created on the local host. + + MSG_CONFIRM: set when the frame was sent via the socket it is received on. + This flag can be interpreted as a 'transmission confirmation' when the + CAN driver supports the echo of frames on driver level, see 3.2 and 6.2. + In order to receive such messages, CAN_RAW_RECV_OWN_MSGS must be set. + 4.2 Broadcast Manager protocol sockets (SOCK_DGRAM) 4.3 connected transport protocols (SOCK_SEQPACKET) 4.4 unconnected transport protocols (SOCK_DGRAM) diff --git a/net/can/raw.c b/net/can/raw.c index 7d77e67e57a..e88f610fdb7 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -90,23 +90,39 @@ struct raw_sock { can_err_mask_t err_mask; }; +/* + * Return pointer to store the extra msg flags for raw_recvmsg(). + * We use the space of one unsigned int beyond the 'struct sockaddr_can' + * in skb->cb. + */ +static inline unsigned int *raw_flags(struct sk_buff *skb) +{ + BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) + + sizeof(unsigned int))); + + /* return pointer after struct sockaddr_can */ + return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]); +} + static inline struct raw_sock *raw_sk(const struct sock *sk) { return (struct raw_sock *)sk; } -static void raw_rcv(struct sk_buff *skb, void *data) +static void raw_rcv(struct sk_buff *oskb, void *data) { struct sock *sk = (struct sock *)data; struct raw_sock *ro = raw_sk(sk); struct sockaddr_can *addr; + struct sk_buff *skb; + unsigned int *pflags; /* check the received tx sock reference */ - if (!ro->recv_own_msgs && skb->sk == sk) + if (!ro->recv_own_msgs && oskb->sk == sk) return; /* clone the given skb to be able to enqueue it into the rcv queue */ - skb = skb_clone(skb, GFP_ATOMIC); + skb = skb_clone(oskb, GFP_ATOMIC); if (!skb) return; @@ -123,6 +139,14 @@ static void raw_rcv(struct sk_buff *skb, void *data) addr->can_family = AF_CAN; addr->can_ifindex = skb->dev->ifindex; + /* add CAN specific message flags for raw_recvmsg() */ + pflags = raw_flags(skb); + *pflags = 0; + if (oskb->sk) + *pflags |= MSG_DONTROUTE; + if (oskb->sk == sk) + *pflags |= MSG_CONFIRM; + if (sock_queue_rcv_skb(sk, skb) < 0) kfree_skb(skb); } @@ -707,6 +731,9 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock, memcpy(msg->msg_name, skb->cb, msg->msg_namelen); } + /* assign the flags that have been recorded in raw_rcv() */ + msg->msg_flags |= *(raw_flags(skb)); + skb_free_datagram(sk, skb); return size; -- cgit v1.2.3-70-g09d2 From 5e5073280379d38e86ade471daa7443b553fc839 Mon Sep 17 00:00:00 2001 From: Kurt Van Dijck Date: Sat, 15 Jan 2011 20:56:42 -0800 Subject: can: test size of struct sockaddr in sendmsg This patch makes the CAN socket code conform to the manpage of sendmsg. Signed-off-by: Kurt Van Dijck Acked-by: Oliver Hartkopp Signed-off-by: David S. Miller --- net/can/bcm.c | 3 +++ net/can/raw.c | 3 +++ 2 files changed, 6 insertions(+) (limited to 'net/can/raw.c') diff --git a/net/can/bcm.c b/net/can/bcm.c index 9d5e8accfab..092dc88a7c6 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -1256,6 +1256,9 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, struct sockaddr_can *addr = (struct sockaddr_can *)msg->msg_name; + if (msg->msg_namelen < sizeof(*addr)) + return -EINVAL; + if (addr->can_family != AF_CAN) return -EINVAL; diff --git a/net/can/raw.c b/net/can/raw.c index e88f610fdb7..883e9d74fdd 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -649,6 +649,9 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, struct sockaddr_can *addr = (struct sockaddr_can *)msg->msg_name; + if (msg->msg_namelen < sizeof(*addr)) + return -EINVAL; + if (addr->can_family != AF_CAN) return -EINVAL; -- cgit v1.2.3-70-g09d2