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    Subject[PATCH] net: packet: option to only pass skb protocol
    When sending packets with a packet socket it is often necessary to set
    protocol in msg_name: otherwise the protocol field in the skb will not
    be set correctly. However, currently doing this also requires
    supplying the interface index.

    The following patch makes it possible to avoid supplying the interface
    index by interpreting index 0 as "use device this socket is bound to".

    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    ---
    net/packet/af_packet.c | 4 ++--
    1 files changed, 2 insertions(+), 2 deletions(-)

    diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
    index e0516a2..a81dae8 100644
    --- a/net/packet/af_packet.c
    +++ b/net/packet/af_packet.c
    @@ -958,7 +958,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
    + offsetof(struct sockaddr_ll,
    sll_addr)))
    goto out;
    - ifindex = saddr->sll_ifindex;
    + ifindex = saddr->sll_ifindex ? : po->ifindex;
    proto = saddr->sll_protocol;
    addr = saddr->sll_addr;
    }
    @@ -1074,7 +1074,7 @@ static int packet_snd(struct socket *sock,
    goto out;
    if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
    goto out;
    - ifindex = saddr->sll_ifindex;
    + ifindex = saddr->sll_ifindex ? : po->ifindex;
    proto = saddr->sll_protocol;
    addr = saddr->sll_addr;
    }
    --
    1.6.6.rc1.43.gf55cc

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