diff options
Diffstat (limited to 'net/llc/af_llc.c')
| -rw-r--r-- | net/llc/af_llc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c index 3a66546cad0..ac691fe0807 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -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 @@ copy_uaddr: 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; |