mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 19:36:40 +07:00
3384901f1b
Add dev_put() after dev_get_by_index() to avoid leakage of device. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
678 lines
15 KiB
C
678 lines
15 KiB
C
/*
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* NET3: Token ring device handling subroutines
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Fixes: 3 Feb 97 Paul Norton <pnorton@cts.com> Minor routing fixes.
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* Added rif table to /proc/net/tr_rif and rif timeout to
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* /proc/sys/net/token-ring/rif_timeout.
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* 22 Jun 98 Paul Norton <p.norton@computer.org> Rearranged
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* tr_header and tr_type_trans to handle passing IPX SNAP and
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* 802.2 through the correct layers. Eliminated tr_reformat.
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*
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*/
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/trdevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/net.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <net/arp.h>
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#include <net/net_namespace.h>
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static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
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static void rif_check_expire(unsigned long dummy);
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#define TR_SR_DEBUG 0
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/*
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* Each RIF entry we learn is kept this way
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*/
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struct rif_cache {
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unsigned char addr[TR_ALEN];
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int iface;
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__be16 rcf;
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__be16 rseg[8];
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struct rif_cache *next;
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unsigned long last_used;
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unsigned char local_ring;
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};
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#define RIF_TABLE_SIZE 32
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/*
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* We hash the RIF cache 32 ways. We do after all have to look it
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* up a lot.
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*/
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static struct rif_cache *rif_table[RIF_TABLE_SIZE];
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static DEFINE_SPINLOCK(rif_lock);
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/*
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* Garbage disposal timer.
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*/
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static struct timer_list rif_timer;
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static int sysctl_tr_rif_timeout = 60*10*HZ;
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static inline unsigned long rif_hash(const unsigned char *addr)
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{
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unsigned long x;
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x = addr[0];
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x = (x << 2) ^ addr[1];
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x = (x << 2) ^ addr[2];
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x = (x << 2) ^ addr[3];
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x = (x << 2) ^ addr[4];
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x = (x << 2) ^ addr[5];
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x ^= x >> 8;
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return x & (RIF_TABLE_SIZE - 1);
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}
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/*
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* Put the headers on a token ring packet. Token ring source routing
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* makes this a little more exciting than on ethernet.
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*/
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static int tr_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type,
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const void *daddr, const void *saddr, unsigned len)
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{
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struct trh_hdr *trh;
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int hdr_len;
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/*
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* Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
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* dev->hard_header directly.
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*/
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if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
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{
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struct trllc *trllc;
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hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
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trh = (struct trh_hdr *)skb_push(skb, hdr_len);
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trllc = (struct trllc *)(trh+1);
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trllc->dsap = trllc->ssap = EXTENDED_SAP;
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trllc->llc = UI_CMD;
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trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
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trllc->ethertype = htons(type);
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}
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else
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{
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hdr_len = sizeof(struct trh_hdr);
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trh = (struct trh_hdr *)skb_push(skb, hdr_len);
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}
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trh->ac=AC;
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trh->fc=LLC_FRAME;
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if(saddr)
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memcpy(trh->saddr,saddr,dev->addr_len);
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else
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memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
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/*
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* Build the destination and then source route the frame
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*/
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if(daddr)
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{
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memcpy(trh->daddr,daddr,dev->addr_len);
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tr_source_route(skb, trh, dev);
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return(hdr_len);
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}
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return -hdr_len;
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}
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/*
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* A neighbour discovery of some species (eg arp) has completed. We
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* can now send the packet.
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*/
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static int tr_rebuild_header(struct sk_buff *skb)
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{
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struct trh_hdr *trh=(struct trh_hdr *)skb->data;
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struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
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struct net_device *dev = skb->dev;
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/*
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* FIXME: We don't yet support IPv6 over token rings
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*/
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if(trllc->ethertype != htons(ETH_P_IP)) {
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printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(trllc->ethertype));
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return 0;
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}
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#ifdef CONFIG_INET
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if(arp_find(trh->daddr, skb)) {
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return 1;
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}
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else
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#endif
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{
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tr_source_route(skb,trh,dev);
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return 0;
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}
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}
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/*
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* Some of this is a bit hackish. We intercept RIF information
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* used for source routing. We also grab IP directly and don't feed
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* it via SNAP.
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*/
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__be16 tr_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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struct trh_hdr *trh;
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struct trllc *trllc;
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unsigned riflen=0;
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skb->dev = dev;
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skb_reset_mac_header(skb);
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trh = tr_hdr(skb);
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if(trh->saddr[0] & TR_RII)
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riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
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trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
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skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
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if(*trh->daddr & 0x80)
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{
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if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
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skb->pkt_type=PACKET_BROADCAST;
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else
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skb->pkt_type=PACKET_MULTICAST;
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}
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else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
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{
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skb->pkt_type=PACKET_MULTICAST;
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}
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else if(dev->flags & IFF_PROMISC)
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{
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if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
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skb->pkt_type=PACKET_OTHERHOST;
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}
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if ((skb->pkt_type != PACKET_BROADCAST) &&
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(skb->pkt_type != PACKET_MULTICAST))
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tr_add_rif_info(trh,dev) ;
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/*
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* Strip the SNAP header from ARP packets since we don't
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* pass them through to the 802.2/SNAP layers.
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*/
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if (trllc->dsap == EXTENDED_SAP &&
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(trllc->ethertype == htons(ETH_P_IP) ||
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trllc->ethertype == htons(ETH_P_IPV6) ||
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trllc->ethertype == htons(ETH_P_ARP)))
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{
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skb_pull(skb, sizeof(struct trllc));
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return trllc->ethertype;
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}
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return htons(ETH_P_TR_802_2);
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}
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/*
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* We try to do source routing...
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*/
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void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,
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struct net_device *dev)
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{
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int slack;
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unsigned int hash;
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struct rif_cache *entry;
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unsigned char *olddata;
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unsigned long flags;
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static const unsigned char mcast_func_addr[]
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= {0xC0,0x00,0x00,0x04,0x00,0x00};
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spin_lock_irqsave(&rif_lock, flags);
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/*
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* Broadcasts are single route as stated in RFC 1042
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*/
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if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
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(!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
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{
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trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
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| TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
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trh->saddr[0]|=TR_RII;
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}
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else
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{
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hash = rif_hash(trh->daddr);
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/*
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* Walk the hash table and look for an entry
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*/
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for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
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/*
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* If we found an entry we can route the frame.
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*/
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if(entry)
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{
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#if TR_SR_DEBUG
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printk("source routing for %pM\n", trh->daddr);
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#endif
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if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
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{
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trh->rcf=entry->rcf;
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memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
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trh->rcf^=htons(TR_RCF_DIR_BIT);
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trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
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trh->saddr[0]|=TR_RII;
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#if TR_SR_DEBUG
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printk("entry found with rcf %04x\n", entry->rcf);
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}
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else
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{
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printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
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#endif
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}
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entry->last_used=jiffies;
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}
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else
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{
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/*
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* Without the information we simply have to shout
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* on the wire. The replies should rapidly clean this
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* situation up.
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*/
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trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
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| TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
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trh->saddr[0]|=TR_RII;
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#if TR_SR_DEBUG
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printk("no entry in rif table found - broadcasting frame\n");
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#endif
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}
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}
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/* Compress the RIF here so we don't have to do it in the driver(s) */
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if (!(trh->saddr[0] & 0x80))
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slack = 18;
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else
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slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
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olddata = skb->data;
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spin_unlock_irqrestore(&rif_lock, flags);
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skb_pull(skb, slack);
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memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
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}
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/*
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* We have learned some new RIF information for our source
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* routing.
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*/
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static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
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{
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unsigned int hash, rii_p = 0;
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unsigned long flags;
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struct rif_cache *entry;
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unsigned char saddr0;
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spin_lock_irqsave(&rif_lock, flags);
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saddr0 = trh->saddr[0];
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/*
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* Firstly see if the entry exists
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*/
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if(trh->saddr[0] & TR_RII)
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{
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trh->saddr[0]&=0x7f;
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if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
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{
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rii_p = 1;
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}
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}
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hash = rif_hash(trh->saddr);
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for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
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if(entry==NULL)
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{
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#if TR_SR_DEBUG
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printk("adding rif_entry: addr:%pM rcf:%04X\n",
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trh->saddr, ntohs(trh->rcf));
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#endif
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/*
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* Allocate our new entry. A failure to allocate loses
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* use the information. This is harmless.
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*
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* FIXME: We ought to keep some kind of cache size
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* limiting and adjust the timers to suit.
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*/
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entry=kmalloc(sizeof(struct rif_cache),GFP_ATOMIC);
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if(!entry)
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{
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printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
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spin_unlock_irqrestore(&rif_lock, flags);
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return;
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}
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memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
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entry->iface = dev->ifindex;
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entry->next=rif_table[hash];
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entry->last_used=jiffies;
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rif_table[hash]=entry;
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if (rii_p)
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{
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entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
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memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
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entry->local_ring = 0;
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}
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else
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{
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entry->local_ring = 1;
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}
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}
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else /* Y. Tahara added */
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{
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/*
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* Update existing entries
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*/
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if (!entry->local_ring)
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if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
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!(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
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{
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#if TR_SR_DEBUG
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printk("updating rif_entry: addr:%pM rcf:%04X\n",
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trh->saddr, ntohs(trh->rcf));
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#endif
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entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
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memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
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}
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entry->last_used=jiffies;
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}
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trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
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spin_unlock_irqrestore(&rif_lock, flags);
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}
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/*
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* Scan the cache with a timer and see what we need to throw out.
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*/
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static void rif_check_expire(unsigned long dummy)
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{
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int i;
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unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
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spin_lock_irqsave(&rif_lock, flags);
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for(i =0; i < RIF_TABLE_SIZE; i++) {
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struct rif_cache *entry, **pentry;
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pentry = rif_table+i;
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while((entry=*pentry) != NULL) {
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unsigned long expires
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= entry->last_used + sysctl_tr_rif_timeout;
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if (time_before_eq(expires, jiffies)) {
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*pentry = entry->next;
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kfree(entry);
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} else {
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pentry = &entry->next;
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if (time_before(expires, next_interval))
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next_interval = expires;
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}
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}
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}
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spin_unlock_irqrestore(&rif_lock, flags);
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mod_timer(&rif_timer, next_interval);
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}
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/*
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* Generate the /proc/net information for the token ring RIF
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* routing.
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*/
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#ifdef CONFIG_PROC_FS
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static struct rif_cache *rif_get_idx(loff_t pos)
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{
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int i;
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struct rif_cache *entry;
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loff_t off = 0;
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for(i = 0; i < RIF_TABLE_SIZE; i++)
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for(entry = rif_table[i]; entry; entry = entry->next) {
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if (off == pos)
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return entry;
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++off;
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}
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return NULL;
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}
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static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(&rif_lock)
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{
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spin_lock_irq(&rif_lock);
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return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
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}
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static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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int i;
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struct rif_cache *ent = v;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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i = -1;
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goto scan;
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}
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if (ent->next)
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return ent->next;
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i = rif_hash(ent->addr);
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scan:
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while (++i < RIF_TABLE_SIZE) {
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if ((ent = rif_table[i]) != NULL)
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return ent;
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}
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return NULL;
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|
}
|
|
|
|
static void rif_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(&rif_lock)
|
|
{
|
|
spin_unlock_irq(&rif_lock);
|
|
}
|
|
|
|
static int rif_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
int j, rcf_len, segment, brdgnmb;
|
|
struct rif_cache *entry = v;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq,
|
|
"if TR address TTL rcf routing segments\n");
|
|
else {
|
|
struct net_device *dev = dev_get_by_index(&init_net, entry->iface);
|
|
long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
|
|
- (long) jiffies;
|
|
|
|
seq_printf(seq, "%s %pM %7li ",
|
|
dev?dev->name:"?",
|
|
entry->addr,
|
|
ttl/HZ);
|
|
|
|
if (entry->local_ring)
|
|
seq_puts(seq, "local\n");
|
|
else {
|
|
|
|
seq_printf(seq, "%04X", ntohs(entry->rcf));
|
|
rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
|
|
if (rcf_len)
|
|
rcf_len >>= 1;
|
|
for(j = 1; j < rcf_len; j++) {
|
|
if(j==1) {
|
|
segment=ntohs(entry->rseg[j-1])>>4;
|
|
seq_printf(seq," %03X",segment);
|
|
}
|
|
|
|
segment=ntohs(entry->rseg[j])>>4;
|
|
brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
|
|
seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
|
|
}
|
|
seq_putc(seq, '\n');
|
|
}
|
|
|
|
if (dev)
|
|
dev_put(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct seq_operations rif_seq_ops = {
|
|
.start = rif_seq_start,
|
|
.next = rif_seq_next,
|
|
.stop = rif_seq_stop,
|
|
.show = rif_seq_show,
|
|
};
|
|
|
|
static int rif_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &rif_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations rif_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rif_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#endif
|
|
|
|
static const struct header_ops tr_header_ops = {
|
|
.create = tr_header,
|
|
.rebuild= tr_rebuild_header,
|
|
};
|
|
|
|
static void tr_setup(struct net_device *dev)
|
|
{
|
|
/*
|
|
* Configure and register
|
|
*/
|
|
|
|
dev->header_ops = &tr_header_ops;
|
|
|
|
dev->type = ARPHRD_IEEE802_TR;
|
|
dev->hard_header_len = TR_HLEN;
|
|
dev->mtu = 2000;
|
|
dev->addr_len = TR_ALEN;
|
|
dev->tx_queue_len = 100; /* Long queues on tr */
|
|
|
|
memset(dev->broadcast,0xFF, TR_ALEN);
|
|
|
|
/* New-style flags. */
|
|
dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
|
|
}
|
|
|
|
/**
|
|
* alloc_trdev - Register token ring device
|
|
* @sizeof_priv: Size of additional driver-private structure to be allocated
|
|
* for this token ring device
|
|
*
|
|
* Fill in the fields of the device structure with token ring-generic values.
|
|
*
|
|
* Constructs a new net device, complete with a private data area of
|
|
* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
|
|
* this private data area.
|
|
*/
|
|
struct net_device *alloc_trdev(int sizeof_priv)
|
|
{
|
|
return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table tr_table[] = {
|
|
{
|
|
.ctl_name = NET_TR_RIF_TIMEOUT,
|
|
.procname = "rif_timeout",
|
|
.data = &sysctl_tr_rif_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{ 0 },
|
|
};
|
|
|
|
static __initdata struct ctl_path tr_path[] = {
|
|
{ .procname = "net", .ctl_name = CTL_NET, },
|
|
{ .procname = "token-ring", .ctl_name = NET_TR, },
|
|
{ }
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Called during bootup. We don't actually have to initialise
|
|
* too much for this.
|
|
*/
|
|
|
|
static int __init rif_init(void)
|
|
{
|
|
rif_timer.expires = jiffies + sysctl_tr_rif_timeout;
|
|
setup_timer(&rif_timer, rif_check_expire, 0);
|
|
add_timer(&rif_timer);
|
|
#ifdef CONFIG_SYSCTL
|
|
register_sysctl_paths(tr_path, tr_table);
|
|
#endif
|
|
proc_net_fops_create(&init_net, "tr_rif", S_IRUGO, &rif_seq_fops);
|
|
return 0;
|
|
}
|
|
|
|
module_init(rif_init);
|
|
|
|
EXPORT_SYMBOL(tr_type_trans);
|
|
EXPORT_SYMBOL(alloc_trdev);
|
|
|
|
MODULE_LICENSE("GPL");
|