cregit-Linux how code gets into the kernel

Release 4.8 net/atm/mpc.c

Directory: net/atm

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/seq_file.h>

/* We are an ethernet device */
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/sock.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <net/checksum.h>   /* for ip_fast_csum() */
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>

/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
#include <linux/atmmpc.h>
/* Modular too */
#include <linux/module.h>

#include "lec.h"
#include "mpc.h"
#include "resources.h"

/*
 * mpc.c: Implementation of MPOA client kernel part
 */

#if 0
#define dprintk(format, args...) \
	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
#define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
#else

#define dprintk(format, args...)					\
	do { if (0)                                                     \
                printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
        } while (0)

#define dprintk_cont(format, args...)			\
	do { if (0) printk(KERN_CONT format, ##args); } while (0)
#endif

#if 0
#define ddprintk(format, args...) \
	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
#define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
#else

#define ddprintk(format, args...)					\
	do { if (0)                                                     \
                printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
        } while (0)

#define ddprintk_cont(format, args...)			\
	do { if (0) printk(KERN_CONT format, ##args); } while (0)
#endif

/* mpc_daemon -> kernel */
static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
		     int action);
static void MPOA_cache_impos_rcvd(struct k_message *msg,
				  struct mpoa_client *mpc);
static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
				   struct mpoa_client *mpc);
static void set_mps_mac_addr_rcvd(struct k_message *mesg,
				  struct mpoa_client *mpc);

static const uint8_t *copy_macs(struct mpoa_client *mpc,
				const uint8_t *router_mac,
				const uint8_t *tlvs, uint8_t mps_macs,
				uint8_t device_type);
static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);

static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
static void mpoad_close(struct atm_vcc *vcc);
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);

static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
				   struct net_device *dev);
static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
			       unsigned long event, void *dev);
static void mpc_timer_refresh(void);
static void mpc_cache_check(unsigned long checking_time);


static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
	0xaa, 0xaa, 0x03,
	{0x00, 0x00, 0x5e},
	{0x00, 0x03}         /* For MPOA control PDUs */
};

static struct llc_snap_hdr llc_snap_mpoa_data = {
	0xaa, 0xaa, 0x03,
	{0x00, 0x00, 0x00},
	{0x08, 0x00}         /* This is for IP PDUs only */
};

static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
	0xaa, 0xaa, 0x03,
	{0x00, 0x00, 0x00},
	{0x88, 0x4c}         /* This is for tagged data PDUs */
};


static struct notifier_block mpoa_notifier = {
	mpoa_event_listener,
	NULL,
	0
};


struct mpoa_client *mpcs = NULL; 
/* FIXME */

static struct atm_mpoa_qos *qos_head = NULL;
static DEFINE_TIMER(mpc_timer, NULL, 0, 0);



static struct mpoa_client *find_mpc_by_itfnum(int itf) { struct mpoa_client *mpc; mpc = mpcs; /* our global linked list */ while (mpc != NULL) { if (mpc->dev_num == itf) return mpc; mpc = mpc->next; } return NULL; /* not found */ }

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static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc) { struct mpoa_client *mpc; mpc = mpcs; /* our global linked list */ while (mpc != NULL) { if (mpc->mpoad_vcc == vcc) return mpc; mpc = mpc->next; } return NULL; /* not found */ }

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static struct mpoa_client *find_mpc_by_lec(struct net_device *dev) { struct mpoa_client *mpc; mpc = mpcs; /* our global linked list */ while (mpc != NULL) { if (mpc->dev == dev) return mpc; mpc = mpc->next; } return NULL; /* not found */ }

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/* * Functions for managing QoS list */ /* * Overwrites the old entry or makes a new one. */
struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos) { struct atm_mpoa_qos *entry; entry = atm_mpoa_search_qos(dst_ip); if (entry != NULL) { entry->qos = *qos; return entry; } entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL); if (entry == NULL) { pr_info("mpoa: out of memory\n"); return entry; } entry->ipaddr = dst_ip; entry->qos = *qos; entry->next = qos_head; qos_head = entry; return entry; }

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struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip) { struct atm_mpoa_qos *qos; qos = qos_head; while (qos) { if (qos->ipaddr == dst_ip) break; qos = qos->next; } return qos; }

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/* * Returns 0 for failure */
int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry) { struct atm_mpoa_qos *curr; if (entry == NULL) return 0; if (entry == qos_head) { qos_head = qos_head->next; kfree(entry); return 1; } curr = qos_head; while (curr != NULL) { if (curr->next == entry) { curr->next = entry->next; kfree(entry); return 1; } curr = curr->next; } return 0; }

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/* this is buggered - we need locking for qos_head */
void atm_mpoa_disp_qos(struct seq_file *m) { struct atm_mpoa_qos *qos; qos = qos_head; seq_printf(m, "QoS entries for shortcuts:\n"); seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n"); while (qos != NULL) { seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n", &qos->ipaddr, qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu, qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu); qos = qos->next; } }

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static struct net_device *find_lec_by_itfnum(int itf) { struct net_device *dev; char name[IFNAMSIZ]; sprintf(name, "lec%d", itf); dev = dev_get_by_name(&init_net, name); return dev; }

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static struct mpoa_client *alloc_mpc(void) { struct mpoa_client *mpc; mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL); if (mpc == NULL) return NULL; rwlock_init(&mpc->ingress_lock); rwlock_init(&mpc->egress_lock); mpc->next = mpcs; atm_mpoa_init_cache(mpc); mpc->parameters.mpc_p1 = MPC_P1; mpc->parameters.mpc_p2 = MPC_P2; memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3)); mpc->parameters.mpc_p4 = MPC_P4; mpc->parameters.mpc_p5 = MPC_P5; mpc->parameters.mpc_p6 = MPC_P6; mpcs = mpc; return mpc; }

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/* * * start_mpc() puts the MPC on line. All the packets destined * to the lec underneath us are now being monitored and * shortcuts will be established. * */
static void start_mpc(struct mpoa_client *mpc, struct net_device *dev) { dprintk("(%s)\n", mpc->dev->name); if (!dev->netdev_ops) pr_info("(%s) not starting\n", dev->name); else { mpc->old_ops = dev->netdev_ops; mpc->new_ops = *mpc->old_ops; mpc->new_ops.ndo_start_xmit = mpc_send_packet; dev->netdev_ops = &mpc->new_ops; } }

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static void stop_mpc(struct mpoa_client *mpc) { struct net_device *dev = mpc->dev; dprintk("(%s)", mpc->dev->name); /* Lets not nullify lec device's dev->hard_start_xmit */ if (dev->netdev_ops != &mpc->new_ops) { dprintk_cont(" mpc already stopped, not fatal\n"); return; } dprintk_cont("\n"); dev->netdev_ops = mpc->old_ops; mpc->old_ops = NULL; /* close_shortcuts(mpc); ??? FIXME */ }

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static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
static const char *mpoa_device_type_string(char type) { switch (type) { case NON_MPOA: return "non-MPOA device"; case MPS: return "MPS"; case MPC: return "MPC"; case MPS_AND_MPC: return "both MPS and MPC"; } return "unspecified (non-MPOA) device"; }

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/* * lec device calls this via its netdev_priv(dev)->lane2_ops * ->associate_indicator() when it sees a TLV in LE_ARP packet. * We fill in the pointer above when we see a LANE2 lec initializing * See LANE2 spec 3.1.5 * * Quite a big and ugly function but when you look at it * all it does is to try to locate and parse MPOA Device * Type TLV. * We give our lec a pointer to this function and when the * lec sees a TLV it uses the pointer to call this function. * */
static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr, const u8 *tlvs, u32 sizeoftlvs) { uint32_t type; uint8_t length, mpoa_device_type, number_of_mps_macs; const uint8_t *end_of_tlvs; struct mpoa_client *mpc; mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */ dprintk("(%s) received TLV(s), ", dev->name); dprintk("total length of all TLVs %d\n", sizeoftlvs); mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */ if (mpc == NULL) { pr_info("(%s) no mpc\n", dev->name); return; } end_of_tlvs = tlvs + sizeoftlvs; while (end_of_tlvs - tlvs >= 5) { type = ((tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3]); length = tlvs[4]; tlvs += 5; dprintk(" type 0x%x length %02x\n", type, length); if (tlvs + length > end_of_tlvs) { pr_info("TLV value extends past its buffer, aborting parse\n"); return; } if (type == 0) { pr_info("mpoa: (%s) TLV type was 0, returning\n", dev->name); return; } if (type != TLV_MPOA_DEVICE_TYPE) { tlvs += length; continue; /* skip other TLVs */ } mpoa_device_type = *tlvs++; number_of_mps_macs = *tlvs++; dprintk("(%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type)); if (mpoa_device_type == MPS_AND_MPC && length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */ pr_info("(%s) short MPOA Device Type TLV\n", dev->name); continue; } if ((mpoa_device_type == MPS || mpoa_device_type == MPC) && length < 22 + number_of_mps_macs*ETH_ALEN) { pr_info("(%s) short MPOA Device Type TLV\n", dev->name); continue; } if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) { dprintk("ignoring non-MPS device "); if (mpoa_device_type == MPC) tlvs += 20; continue; /* we are only interested in MPSs */ } if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) { pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name); continue; /* someone should read the spec */ } dprintk_cont("this MPS has %d MAC addresses\n", number_of_mps_macs); /* * ok, now we can go and tell our daemon * the control address of MPS */ send_set_mps_ctrl_addr(tlvs, mpc); tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type); if (tlvs == NULL) return; } if (end_of_tlvs - tlvs != 0) pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n", dev->name, end_of_tlvs - tlvs); }

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/* * Store at least advertizing router's MAC address * plus the possible MAC address(es) to mpc->mps_macs. * For a freshly allocated MPOA client mpc->mps_macs == 0. */
static const uint8_t *copy_macs(struct mpoa_client *mpc, const uint8_t *router_mac, const uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type) { int num_macs; num_macs = (mps_macs > 1) ? mps_macs : 1; if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */ if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs); mpc->number_of_mps_macs = 0; mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL); if (mpc->mps_macs == NULL) { pr_info("(%s) out of mem\n", mpc->dev->name); return NULL; } } ether_addr_copy(mpc->mps_macs, router_mac); tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20; if (mps_macs > 0) memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN); tlvs += mps_macs*ETH_ALEN; mpc->number_of_mps_macs = num_macs; return tlvs; }

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static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc) { in_cache_entry *entry; struct iphdr *iph; char *buff; __be32 ipaddr = 0; static struct { struct llc_snap_hdr hdr; __be32 tag; } tagged_llc_snap_hdr = { {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}}, 0 }; buff = skb->data + mpc->dev->hard_header_len; iph = (struct iphdr *)buff; ipaddr = iph->daddr; ddprintk("(%s) ipaddr 0x%x\n", mpc->dev->name, ipaddr); entry = mpc->in_ops->get(ipaddr, mpc); if (entry == NULL) { entry = mpc->in_ops->add_entry(ipaddr, mpc); if (entry != NULL) mpc->in_ops->put(entry); return 1; } /* threshold not exceeded or VCC not ready */ if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) { ddprintk("(%s) cache_hit: returns != OPEN\n", mpc->dev->name); mpc->in_ops->put(entry); return 1; } ddprintk("(%s) using shortcut\n", mpc->dev->name); /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */ if (iph->ttl <= 1) { ddprintk("(%s) IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl); mpc->in_ops->put(entry); return 1; } iph->ttl--; iph->check = 0; iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); if (entry->ctrl_info.tag != 0) { ddprintk("(%s) adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag); tagged_llc_snap_hdr.tag = entry->ctrl_info.tag; skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */ skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr)); } else { skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */ skb_copy_to_linear_data(skb, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)); } atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; entry->shortcut->send(entry->shortcut, skb); entry->packets_fwded++; mpc->in_ops->put(entry); return 0; }

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/* * Probably needs some error checks and locking, not sure... */
static netdev_tx_t mpc_send_packet(struct sk_buff *skb, struct net_device *dev) { struct mpoa_client *mpc; struct ethhdr *eth; int i = 0; mpc = find_mpc_by_lec(dev); /* this should NEVER fail */ if (mpc == NULL) { pr_info("(%s) no MPC found\n", dev->name); goto non_ip; } eth = (struct ethhdr *)skb->data; if (eth->h_proto != htons(ETH_P_IP)) goto non_ip; /* Multi-Protocol Over ATM :-) */ /* Weed out funny packets (e.g., AF_PACKET or raw). */ if (skb->len < ETH_HLEN + sizeof(struct iphdr)) goto non_ip; skb_set_network_header(skb, ETH_HLEN); if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5) goto non_ip; while (i < mpc->number_of_mps_macs) { if (ether_addr_equal(eth->h_dest, mpc->mps_macs + i * ETH_ALEN)) if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */ return NETDEV_TX_OK; i++; } non_ip: return __netdev_start_xmit(mpc->old_ops, skb, dev, false); }

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static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) { int bytes_left; struct mpoa_client *mpc; struct atmmpc_ioc ioc_data; in_cache_entry *in_entry; __be32 ipaddr; bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); if (bytes_left != 0) { pr_info("mpoa:Short read (missed %d bytes) from userland\n", bytes_left); return -EFAULT; } ipaddr = ioc_data.ipaddr; if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) return -EINVAL; mpc = find_mpc_by_itfnum(ioc_data.dev_num); if (mpc == NULL) return -EINVAL; if (ioc_data.type == MPC_SOCKET_INGRESS) { in_entry = mpc->in_ops->get(ipaddr, mpc); if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) { pr_info("(%s) did not find RESOLVED entry from ingress cache\n", mpc->dev->name); if (in_entry != NULL) mpc->in_ops->put(in_entry); return -EINVAL; } pr_info("(%s) attaching ingress SVC, entry = %pI4\n", mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); in_entry->shortcut = vcc; mpc->in_ops->put(in_entry); } else { pr_info("(%s) attaching egress SVC\n", mpc->dev->name); } vcc->proto_data = mpc->dev; vcc->push = mpc_push; return 0; }

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Total244100.00%8100.00%

/* * */
static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev) { struct mpoa_client *mpc; in_cache_entry *in_entry; eg_cache_entry *eg_entry; mpc = find_mpc_by_lec(dev); if (mpc == NULL) { pr_info("(%s) close for unknown MPC\n", dev->name); return; } dprintk("(%s)\n", dev->name); in_entry = mpc->in_ops->get_by_vcc(vcc, mpc); if (in_entry) { dprintk("(%s) ingress SVC closed ip = %pI4\n", mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); in_entry->shortcut = NULL; mpc->in_ops->put(in_entry); } eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); if (eg_entry) { dprintk("(%s) egress SVC closed\n", mpc->dev->name); eg_entry->shortcut = NULL; mpc->eg_ops->put(eg_entry); } if (in_entry == NULL && eg_entry == NULL) dprintk("(%s) unused vcc closed\n", dev->name); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git16692.74%233.33%
joe perchesjoe perches63.35%233.33%
al viroal viro63.35%116.67%
harvey harrisonharvey harrison10.56%116.67%
Total179100.00%6100.00%


static void mpc_push(struct atm_vcc *