From 02a47617cdce440f60c71a51f3a93f9f5fcc5a7a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= Date: Sun, 5 Oct 2008 11:16:16 -0700 Subject: Phonet: implement GPRS virtual interface over PEP socket MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rémi Denis-Courmont Signed-off-by: David S. Miller --- net/phonet/pep.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 150 insertions(+), 11 deletions(-) (limited to 'net/phonet/pep.c') diff --git a/net/phonet/pep.c b/net/phonet/pep.c index d564d07cb79..bc6d50f8324 100644 --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -31,6 +31,7 @@ #include #include #include +#include /* sk_state values: * TCP_CLOSE sock not in use yet @@ -612,6 +613,7 @@ drop: static void pep_sock_close(struct sock *sk, long timeout) { struct pep_sock *pn = pep_sk(sk); + int ifindex = 0; sk_common_release(sk); @@ -625,7 +627,12 @@ static void pep_sock_close(struct sock *sk, long timeout) sk_del_node_init(sknode); sk->sk_state = TCP_CLOSE; } + ifindex = pn->ifindex; + pn->ifindex = 0; release_sock(sk); + + if (ifindex) + gprs_detach(sk); } static int pep_wait_connreq(struct sock *sk, int noblock) @@ -730,12 +737,107 @@ static int pep_init(struct sock *sk) return 0; } +static int pep_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, int optlen) +{ + struct pep_sock *pn = pep_sk(sk); + int val = 0, err = 0; + + if (level != SOL_PNPIPE) + return -ENOPROTOOPT; + if (optlen >= sizeof(int)) { + if (get_user(val, (int __user *) optval)) + return -EFAULT; + } + + lock_sock(sk); + switch (optname) { + case PNPIPE_ENCAP: + if (val && val != PNPIPE_ENCAP_IP) { + err = -EINVAL; + break; + } + if (!pn->ifindex == !val) + break; /* Nothing to do! */ + if (!capable(CAP_NET_ADMIN)) { + err = -EPERM; + break; + } + if (val) { + release_sock(sk); + err = gprs_attach(sk); + if (err > 0) { + pn->ifindex = err; + err = 0; + } + } else { + pn->ifindex = 0; + release_sock(sk); + gprs_detach(sk); + err = 0; + } + goto out_norel; + default: + err = -ENOPROTOOPT; + } + release_sock(sk); + +out_norel: + return err; +} + +static int pep_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct pep_sock *pn = pep_sk(sk); + int len, val; + + if (level != SOL_PNPIPE) + return -ENOPROTOOPT; + if (get_user(len, optlen)) + return -EFAULT; + + switch (optname) { + case PNPIPE_ENCAP: + val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; + break; + case PNPIPE_IFINDEX: + val = pn->ifindex; + break; + default: + return -ENOPROTOOPT; + } + + len = min_t(unsigned int, sizeof(int), len); + if (put_user(len, optlen)) + return -EFAULT; + if (put_user(val, (int __user *) optval)) + return -EFAULT; + return 0; +} + +static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) +{ + struct pep_sock *pn = pep_sk(sk); + struct pnpipehdr *ph; + + skb_push(skb, 3); + skb_reset_transport_header(skb); + ph = pnp_hdr(skb); + ph->utid = 0; + ph->message_id = PNS_PIPE_DATA; + ph->pipe_handle = pn->pipe_handle; + if (pn_flow_safe(pn->tx_fc) && pn->tx_credits) + pn->tx_credits--; + + return pn_skb_send(sk, skb, &pipe_srv); +} + static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { struct pep_sock *pn = pep_sk(sk); struct sk_buff *skb = NULL; - struct pnpipehdr *ph; long timeo; int flags = msg->msg_flags; int err, done; @@ -801,16 +903,7 @@ disabled: if (err < 0) goto out; - __skb_push(skb, 3); - skb_reset_transport_header(skb); - ph = pnp_hdr(skb); - ph->utid = 0; - ph->message_id = PNS_PIPE_DATA; - ph->pipe_handle = pn->pipe_handle; - if (pn_flow_safe(pn->tx_fc)) /* credit-based flow control */ - pn->tx_credits--; - - err = pn_skb_send(sk, skb, &pipe_srv); + err = pipe_skb_send(sk, skb); if (err >= 0) err = len; /* success! */ skb = NULL; @@ -820,6 +913,50 @@ out: return err; } +int pep_writeable(struct sock *sk) +{ + struct pep_sock *pn = pep_sk(sk); + + return (sk->sk_state == TCP_ESTABLISHED) ? pn->tx_credits : 0; +} + +int pep_write(struct sock *sk, struct sk_buff *skb) +{ + struct sk_buff *rskb, *fs; + int flen = 0; + + rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); + if (!rskb) { + kfree_skb(skb); + return -ENOMEM; + } + skb_shinfo(rskb)->frag_list = skb; + rskb->len += skb->len; + rskb->data_len += rskb->len; + rskb->truesize += rskb->len; + + /* Avoid nested fragments */ + for (fs = skb_shinfo(skb)->frag_list; fs; fs = fs->next) + flen += fs->len; + skb->next = skb_shinfo(skb)->frag_list; + skb_shinfo(skb)->frag_list = NULL; + skb->len -= flen; + skb->data_len -= flen; + skb->truesize -= flen; + + skb_reserve(rskb, MAX_PHONET_HEADER + 3); + return pipe_skb_send(sk, rskb); +} + +struct sk_buff *pep_read(struct sock *sk) +{ + struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); + + if (sk->sk_state == TCP_ESTABLISHED) + pipe_grant_credits(sk); + return skb; +} + static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int noblock, int flags, int *addr_len) @@ -902,6 +1039,8 @@ static struct proto pep_proto = { .accept = pep_sock_accept, .ioctl = pep_ioctl, .init = pep_init, + .setsockopt = pep_setsockopt, + .getsockopt = pep_getsockopt, .sendmsg = pep_sendmsg, .recvmsg = pep_recvmsg, .backlog_rcv = pep_do_rcv, -- cgit v1.2.3