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llc: add support for LLC_OPT_PKTINFO

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Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Octavian Purdila 2009-12-26 11:51:00 +00:00 committed by David S. Miller
parent bf9ae5386b
commit e5cd6fe391
3 changed files with 37 additions and 0 deletions
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7
include/linux/llc.h
View File

@ -36,6 +36,7 @@ enum llc_sockopts {
LLC_OPT_BUSY_TMR_EXP, /* busy state expire time (secs). */
LLC_OPT_TX_WIN, /* tx window size. */
LLC_OPT_RX_WIN, /* rx window size. */
LLC_OPT_PKTINFO, /* ancillary packet information. */
LLC_OPT_MAX
};
@ -70,6 +71,12 @@ enum llc_sockopts {
#define LLC_SAP_RM 0xD4 /* Resource Management */
#define LLC_SAP_GLOBAL 0xFF /* Global SAP. */
struct llc_pktinfo {
int lpi_ifindex;
unsigned char lpi_sap;
unsigned char lpi_mac[IFHWADDRLEN];
};
#ifdef __KERNEL__
#define LLC_SAP_DYN_START 0xC0
#define LLC_SAP_DYN_STOP 0xDE

1
include/net/llc_conn.h
View File

@ -76,6 +76,7 @@ struct llc_sock {
u32 rx_pdu_hdr; /* used for saving header of last pdu
received and caused sending FRMR.
Used for resending FRMR */
u32 cmsg_flags;
};
static inline struct llc_sock *llc_sk(const struct sock *sk)

29
net/llc/af_llc.c
View File

@ -47,6 +47,10 @@ static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
#define dprintk(args...)
#endif
/* Maybe we'll add some more in the future. */
#define LLC_CMSG_PKTINFO 1
/**
* llc_ui_next_link_no - return the next unused link number for a sap
* @sap: Address of sap to get link number from.
@ -591,6 +595,20 @@ static int llc_wait_data(struct sock *sk, long timeo)
return rc;
}
static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
{
struct llc_sock *llc = llc_sk(skb->sk);
if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
struct llc_pktinfo info;
info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
llc_pdu_decode_dsap(skb, &info.lpi_sap);
llc_pdu_decode_da(skb, info.lpi_mac);
put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
}
}
/**
* llc_ui_accept - accept a new incoming connection.
* @sock: Socket which connections arrive on.
@ -812,6 +830,8 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
msg->msg_namelen = sizeof(*uaddr);
}
if (llc_sk(sk)->cmsg_flags)
llc_cmsg_rcv(msg, skb);
goto out;
}
@ -1030,6 +1050,12 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
goto out;
llc->rw = opt;
break;
case LLC_OPT_PKTINFO:
if (opt)
llc->cmsg_flags |= LLC_CMSG_PKTINFO;
else
llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
break;
default:
rc = -ENOPROTOOPT;
goto out;
@ -1083,6 +1109,9 @@ static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
val = llc->k; break;
case LLC_OPT_RX_WIN:
val = llc->rw; break;
case LLC_OPT_PKTINFO:
val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
break;
default:
rc = -ENOPROTOOPT;
goto out;