From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/net/ax25/ax25_ip.c | 238 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 238 insertions(+) create mode 100644 kernel/net/ax25/ax25_ip.c (limited to 'kernel/net/ax25/ax25_ip.c') diff --git a/kernel/net/ax25/ax25_ip.c b/kernel/net/ax25/ax25_ip.c new file mode 100644 index 000000000..7c646bb2c --- /dev/null +++ b/kernel/net/ax25/ax25_ip.c @@ -0,0 +1,238 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include /* For TIOCINQ/OUTQ */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * IP over AX.25 encapsulation. + */ + +/* + * Shove an AX.25 UI header on an IP packet and handle ARP + */ + +#ifdef CONFIG_INET + +static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned int len) +{ + unsigned char *buff; + + /* they sometimes come back to us... */ + if (type == ETH_P_AX25) + return 0; + + /* header is an AX.25 UI frame from us to them */ + buff = skb_push(skb, AX25_HEADER_LEN); + *buff++ = 0x00; /* KISS DATA */ + + if (daddr != NULL) + memcpy(buff, daddr, dev->addr_len); /* Address specified */ + + buff[6] &= ~AX25_CBIT; + buff[6] &= ~AX25_EBIT; + buff[6] |= AX25_SSSID_SPARE; + buff += AX25_ADDR_LEN; + + if (saddr != NULL) + memcpy(buff, saddr, dev->addr_len); + else + memcpy(buff, dev->dev_addr, dev->addr_len); + + buff[6] &= ~AX25_CBIT; + buff[6] |= AX25_EBIT; + buff[6] |= AX25_SSSID_SPARE; + buff += AX25_ADDR_LEN; + + *buff++ = AX25_UI; /* UI */ + + /* Append a suitable AX.25 PID */ + switch (type) { + case ETH_P_IP: + *buff++ = AX25_P_IP; + break; + case ETH_P_ARP: + *buff++ = AX25_P_ARP; + break; + default: + printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type); + *buff++ = 0; + break; + } + + if (daddr != NULL) + return AX25_HEADER_LEN; + + return -AX25_HEADER_LEN; /* Unfinished header */ +} + +netdev_tx_t ax25_ip_xmit(struct sk_buff *skb) +{ + struct sk_buff *ourskb; + unsigned char *bp = skb->data; + ax25_route *route; + struct net_device *dev = NULL; + ax25_address *src, *dst; + ax25_digi *digipeat = NULL; + ax25_dev *ax25_dev; + ax25_cb *ax25; + char ip_mode = ' '; + + dst = (ax25_address *)(bp + 1); + src = (ax25_address *)(bp + 8); + + route = ax25_get_route(dst, NULL); + if (route) { + digipeat = route->digipeat; + dev = route->dev; + ip_mode = route->ip_mode; + } + + if (dev == NULL) + dev = skb->dev; + + if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) { + kfree_skb(skb); + goto put; + } + + if (bp[16] == AX25_P_IP) { + if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) { + /* + * We copy the buffer and release the original thereby + * keeping it straight + * + * Note: we report 1 back so the caller will + * not feed the frame direct to the physical device + * We don't want that to happen. (It won't be upset + * as we have pulled the frame from the queue by + * freeing it). + * + * NB: TCP modifies buffers that are still + * on a device queue, thus we use skb_copy() + * instead of using skb_clone() unless this + * gets fixed. + */ + + ax25_address src_c; + ax25_address dst_c; + + if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) { + kfree_skb(skb); + goto put; + } + + if (skb->sk != NULL) + skb_set_owner_w(ourskb, skb->sk); + + kfree_skb(skb); + /* dl9sau: bugfix + * after kfree_skb(), dst and src which were pointer + * to bp which is part of skb->data would not be valid + * anymore hope that after skb_pull(ourskb, ..) our + * dsc_c and src_c will not become invalid + */ + bp = ourskb->data; + dst_c = *(ax25_address *)(bp + 1); + src_c = *(ax25_address *)(bp + 8); + + skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */ + skb_reset_network_header(ourskb); + + ax25=ax25_send_frame( + ourskb, + ax25_dev->values[AX25_VALUES_PACLEN], + &src_c, + &dst_c, digipeat, dev); + if (ax25) { + ax25_cb_put(ax25); + } + goto put; + } + } + + bp[7] &= ~AX25_CBIT; + bp[7] &= ~AX25_EBIT; + bp[7] |= AX25_SSSID_SPARE; + + bp[14] &= ~AX25_CBIT; + bp[14] |= AX25_EBIT; + bp[14] |= AX25_SSSID_SPARE; + + skb_pull(skb, AX25_KISS_HEADER_LEN); + + if (digipeat != NULL) { + if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) { + kfree_skb(skb); + goto put; + } + + skb = ourskb; + } + + ax25_queue_xmit(skb, dev); + +put: + if (route) + ax25_put_route(route); + + return NETDEV_TX_OK; +} + +#else /* INET */ + +static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned int len) +{ + return -AX25_HEADER_LEN; +} + +netdev_tx_t ax25_ip_xmit(struct sk_buff *skb) +{ + kfree_skb(skb); + return NETDEV_TX_OK; +} +#endif + +const struct header_ops ax25_header_ops = { + .create = ax25_hard_header, +}; + +EXPORT_SYMBOL(ax25_header_ops); +EXPORT_SYMBOL(ax25_ip_xmit); + -- cgit 1.2.3-korg