10 files changed, 420 insertions, 159 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index ab935778ce81..7016e0c36b3d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -115,18 +115,6 @@
 #endif  /* CONFIG_NET_RADIO */
 #include <asm/current.h>
 
-/* This define, if set, will randomly drop a packet when congestion
- * is more than moderate.  It helps fairness in the multi-interface
- * case when one of them is a hog, but it kills performance for the
- * single interface case so it is off now by default.
- */
-#undef RAND_LIE
-
-/* Setting this will sample the queue lengths and thus congestion
- * via a timer instead of as each packet is received.
- */
-#undef OFFLINE_SAMPLE
-
 /*
  *      The list of packet types we will receive (as opposed to discard)
  *      and the routines to invoke.
@@ -159,11 +147,6 @@ static DEFINE_SPINLOCK(ptype_lock);
 static struct list_head ptype_base[16]; /* 16 way hashed list */
 static struct list_head ptype_all;              /* Taps */
 
-#ifdef OFFLINE_SAMPLE
-static void sample_queue(unsigned long dummy);
-static struct timer_list samp_timer = TIMER_INITIALIZER(sample_queue, 0, 0);
-#endif
-
 /*
  * The @dev_base list is protected by @dev_base_lock and the rtln
  * semaphore.
@@ -215,7 +198,7 @@ static struct notifier_block *netdev_chain;
  *      Device drivers call our routines to queue packets here. We empty the
  *      queue in the local softnet handler.
  */
-DEFINE_PER_CPU(struct softnet_data, softnet_data) = { 0, };
+DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
 
 #ifdef CONFIG_SYSFS
 extern int netdev_sysfs_init(void);
@@ -1363,71 +1346,13 @@ out:
                         Receiver routines
   =======================================================================*/
 
-int netdev_max_backlog = 300;
+int netdev_max_backlog = 1000;
+int netdev_budget = 300;
 int weight_p = 64;            /* old backlog weight */
-/* These numbers are selected based on intuition and some
- * experimentatiom, if you have more scientific way of doing this
- * please go ahead and fix things.
- */
-int no_cong_thresh = 10;
-int no_cong = 20;
-int lo_cong = 100;
-int mod_cong = 290;
 
 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
 
 
-static void get_sample_stats(int cpu)
-{
-#ifdef RAND_LIE
-        unsigned long rd;
-        int rq;
-#endif
-        struct softnet_data *sd = &per_cpu(softnet_data, cpu);
-        int blog = sd->input_pkt_queue.qlen;
-        int avg_blog = sd->avg_blog;
-
-        avg_blog = (avg_blog >> 1) + (blog >> 1);
-
-        if (avg_blog > mod_cong) {
-                /* Above moderate congestion levels. */
-                sd->cng_level = NET_RX_CN_HIGH;
-#ifdef RAND_LIE
-                rd = net_random();
-                rq = rd % netdev_max_backlog;
-                if (rq < avg_blog) /* unlucky bastard */
-                        sd->cng_level = NET_RX_DROP;
-#endif
-        } else if (avg_blog > lo_cong) {
-                sd->cng_level = NET_RX_CN_MOD;
-#ifdef RAND_LIE
-                rd = net_random();
-                rq = rd % netdev_max_backlog;
-                        if (rq < avg_blog) /* unlucky bastard */
-                                sd->cng_level = NET_RX_CN_HIGH;
-#endif
-        } else if (avg_blog > no_cong)
-                sd->cng_level = NET_RX_CN_LOW;
-        else  /* no congestion */
-                sd->cng_level = NET_RX_SUCCESS;
-
-        sd->avg_blog = avg_blog;
-}
-
-#ifdef OFFLINE_SAMPLE
-static void sample_queue(unsigned long dummy)
-{
-/* 10 ms 0r 1ms -- i don't care -- JHS */
-        int next_tick = 1;
-        int cpu = smp_processor_id();
-
-        get_sample_stats(cpu);
-        next_tick += jiffies;
-        mod_timer(&samp_timer, next_tick);
-}
-#endif
-
-
 /**
  *      netif_rx        -       post buffer to the network code
  *      @skb: buffer to post
@@ -1448,7 +1373,6 @@ static void sample_queue(unsigned long dummy)
 
 int netif_rx(struct sk_buff *skb)
 {
-        int this_cpu;
         struct softnet_data *queue;
         unsigned long flags;
 
@@ -1464,38 +1388,22 @@ int netif_rx(struct sk_buff *skb)
          * short when CPU is congested, but is still operating.
          */
         local_irq_save(flags);
-        this_cpu = smp_processor_id();
         queue = &__get_cpu_var(softnet_data);
 
         __get_cpu_var(netdev_rx_stat).total++;
         if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
                 if (queue->input_pkt_queue.qlen) {
-                        if (queue->throttle)
-                                goto drop;
-
 enqueue:
                         dev_hold(skb->dev);
                         __skb_queue_tail(&queue->input_pkt_queue, skb);
-#ifndef OFFLINE_SAMPLE
-                        get_sample_stats(this_cpu);
-#endif
                         local_irq_restore(flags);
-                        return queue->cng_level;
+                        return NET_RX_SUCCESS;
                 }
 
-                if (queue->throttle)
-                        queue->throttle = 0;
-
                 netif_rx_schedule(&queue->backlog_dev);
                 goto enqueue;
         }
 
-        if (!queue->throttle) {
-                queue->throttle = 1;
-                __get_cpu_var(netdev_rx_stat).throttled++;
-        }
-
-drop:
         __get_cpu_var(netdev_rx_stat).dropped++;
         local_irq_restore(flags);
 
@@ -1780,8 +1688,6 @@ job_done:
         smp_mb__before_clear_bit();
         netif_poll_enable(backlog_dev);
 
-        if (queue->throttle)
-                queue->throttle = 0;
         local_irq_enable();
         return 0;
 }
@@ -1790,8 +1696,7 @@ static void net_rx_action(struct softirq_action *h)
 {
         struct softnet_data *queue = &__get_cpu_var(softnet_data);
         unsigned long start_time = jiffies;
-        int budget = netdev_max_backlog;
-
+        int budget = netdev_budget;
         
         local_irq_disable();
 
@@ -2055,15 +1960,9 @@ static int softnet_seq_show(struct seq_file *seq, void *v)
         struct netif_rx_stats *s = v;
 
         seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
-                   s->total, s->dropped, s->time_squeeze, s->throttled,
-                   s->fastroute_hit, s->fastroute_success, s->fastroute_defer,
-                   s->fastroute_deferred_out,
-#if 0
-                   s->fastroute_latency_reduction
-#else
-                   s->cpu_collision
-#endif
-                  );
+                   s->total, s->dropped, s->time_squeeze, 0,
+                   0, 0, 0, 0, /* was fastroute */
+                   s->cpu_collision );
         return 0;
 }
 
@@ -3305,9 +3204,6 @@ static int __init net_dev_init(void)
 
                 queue = &per_cpu(softnet_data, i);
                 skb_queue_head_init(&queue->input_pkt_queue);
-                queue->throttle = 0;
-                queue->cng_level = 0;
-                queue->avg_blog = 10; /* arbitrary non-zero */
                 queue->completion_queue = NULL;
                 INIT_LIST_HEAD(&queue->poll_list);
                 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
@@ -3316,11 +3212,6 @@ static int __init net_dev_init(void)
                 atomic_set(&queue->backlog_dev.refcnt, 1);
         }
 
-#ifdef OFFLINE_SAMPLE
-        samp_timer.expires = jiffies + (10 * HZ);
-        add_timer(&samp_timer);
-#endif
-
         dev_boot_phase = 0;
 
         open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6d68c03bc051..bb73b2190ec7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1500,6 +1500,159 @@ void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len)
                 skb_split_no_header(skb, skb1, len, pos);
 }
 
+/**
+ * skb_prepare_seq_read - Prepare a sequential read of skb data
+ * @skb: the buffer to read
+ * @from: lower offset of data to be read
+ * @to: upper offset of data to be read
+ * @st: state variable
+ *
+ * Initializes the specified state variable. Must be called before
+ * invoking skb_seq_read() for the first time.
+ */
+void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from,
+                          unsigned int to, struct skb_seq_state *st)
+{
+        st->lower_offset = from;
+        st->upper_offset = to;
+        st->root_skb = st->cur_skb = skb;
+        st->frag_idx = st->stepped_offset = 0;
+        st->frag_data = NULL;
+}
+
+/**
+ * skb_seq_read - Sequentially read skb data
+ * @consumed: number of bytes consumed by the caller so far
+ * @data: destination pointer for data to be returned
+ * @st: state variable
+ *
+ * Reads a block of skb data at &consumed relative to the
+ * lower offset specified to skb_prepare_seq_read(). Assigns
+ * the head of the data block to &data and returns the length
+ * of the block or 0 if the end of the skb data or the upper
+ * offset has been reached.
+ *
+ * The caller is not required to consume all of the data
+ * returned, i.e. &consumed is typically set to the number
+ * of bytes already consumed and the next call to
+ * skb_seq_read() will return the remaining part of the block.
+ *
+ * Note: The size of each block of data returned can be arbitary,
+ *       this limitation is the cost for zerocopy seqeuental
+ *       reads of potentially non linear data.
+ *
+ * Note: Fragment lists within fragments are not implemented
+ *       at the moment, state->root_skb could be replaced with
+ *       a stack for this purpose.
+ */
+unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
+                          struct skb_seq_state *st)
+{
+        unsigned int block_limit, abs_offset = consumed + st->lower_offset;
+        skb_frag_t *frag;
+
+        if (unlikely(abs_offset >= st->upper_offset))
+                return 0;
+
+next_skb:
+        block_limit = skb_headlen(st->cur_skb);
+
+        if (abs_offset < block_limit) {
+                *data = st->cur_skb->data + abs_offset;
+                return block_limit - abs_offset;
+        }
+
+        if (st->frag_idx == 0 && !st->frag_data)
+                st->stepped_offset += skb_headlen(st->cur_skb);
+
+        while (st->frag_idx < skb_shinfo(st->cur_skb)->nr_frags) {
+                frag = &skb_shinfo(st->cur_skb)->frags[st->frag_idx];
+                block_limit = frag->size + st->stepped_offset;
+
+                if (abs_offset < block_limit) {
+                        if (!st->frag_data)
+                                st->frag_data = kmap_skb_frag(frag);
+
+                        *data = (u8 *) st->frag_data + frag->page_offset +
+                                (abs_offset - st->stepped_offset);
+
+                        return block_limit - abs_offset;
+                }
+
+                if (st->frag_data) {
+                        kunmap_skb_frag(st->frag_data);
+                        st->frag_data = NULL;
+                }
+
+                st->frag_idx++;
+                st->stepped_offset += frag->size;
+        }
+
+        if (st->cur_skb->next) {
+                st->cur_skb = st->cur_skb->next;
+                st->frag_idx = 0;
+                goto next_skb;
+        } else if (st->root_skb == st->cur_skb &&
+                   skb_shinfo(st->root_skb)->frag_list) {
+                st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
+                goto next_skb;
+        }
+
+        return 0;
+}
+
+/**
+ * skb_abort_seq_read - Abort a sequential read of skb data
+ * @st: state variable
+ *
+ * Must be called if skb_seq_read() was not called until it
+ * returned 0.
+ */
+void skb_abort_seq_read(struct skb_seq_state *st)
+{
+        if (st->frag_data)
+                kunmap_skb_frag(st->frag_data);
+}
+
+#define TS_SKB_CB(state)        ((struct skb_seq_state *) &((state)->cb))
+
+static unsigned int skb_ts_get_next_block(unsigned int offset, const u8 **text,
+                                          struct ts_config *conf,
+                                          struct ts_state *state)
+{
+        return skb_seq_read(offset, text, TS_SKB_CB(state));
+}
+
+static void skb_ts_finish(struct ts_config *conf, struct ts_state *state)
+{
+        skb_abort_seq_read(TS_SKB_CB(state));
+}
+
+/**
+ * skb_find_text - Find a text pattern in skb data
+ * @skb: the buffer to look in
+ * @from: search offset
+ * @to: search limit
+ * @config: textsearch configuration
+ * @state: uninitialized textsearch state variable
+ *
+ * Finds a pattern in the skb data according to the specified
+ * textsearch configuration. Use textsearch_next() to retrieve
+ * subsequent occurrences of the pattern. Returns the offset
+ * to the first occurrence or UINT_MAX if no match was found.
+ */
+unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
+                           unsigned int to, struct ts_config *config,
+                           struct ts_state *state)
+{
+        config->get_next_block = skb_ts_get_next_block;
+        config->finish = skb_ts_finish;
+
+        skb_prepare_seq_read(skb, from, to, TS_SKB_CB(state));
+
+        return textsearch_find(config, state);
+}
+
 void __init skb_init(void)
 {
         skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
@@ -1538,3 +1691,7 @@ EXPORT_SYMBOL(skb_queue_tail);
 EXPORT_SYMBOL(skb_unlink);
 EXPORT_SYMBOL(skb_append);
 EXPORT_SYMBOL(skb_split);
+EXPORT_SYMBOL(skb_prepare_seq_read);
+EXPORT_SYMBOL(skb_seq_read);
+EXPORT_SYMBOL(skb_abort_seq_read);
+EXPORT_SYMBOL(skb_find_text);
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 880a88815211..8f817ad9f546 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -13,12 +13,8 @@
 #ifdef CONFIG_SYSCTL
 
 extern int netdev_max_backlog;
+extern int netdev_budget;
 extern int weight_p;
-extern int no_cong_thresh;
-extern int no_cong;
-extern int lo_cong;
-extern int mod_cong;
-extern int netdev_fastroute;
 extern int net_msg_cost;
 extern int net_msg_burst;
 
@@ -86,38 +82,6 @@ ctl_table core_table[] = {
                 .proc_handler   = &proc_dointvec
         },
         {
-                .ctl_name       = NET_CORE_NO_CONG_THRESH,
-                .procname       = "no_cong_thresh",
-                .data           = &no_cong_thresh,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = &proc_dointvec
-        },
-        {
-                .ctl_name       = NET_CORE_NO_CONG,
-                .procname       = "no_cong",
-                .data           = &no_cong,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = &proc_dointvec
-        },
-        {
-                .ctl_name       = NET_CORE_LO_CONG,
-                .procname       = "lo_cong",
-                .data           = &lo_cong,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = &proc_dointvec
-        },
-        {
-                .ctl_name       = NET_CORE_MOD_CONG,
-                .procname       = "mod_cong",
-                .data           = &mod_cong,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = &proc_dointvec
-        },
-        {
                 .ctl_name       = NET_CORE_MSG_COST,
                 .procname       = "message_cost",
                 .data           = &net_msg_cost,
@@ -161,6 +125,14 @@ ctl_table core_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec
         },
+        {
+                .ctl_name       = NET_CORE_BUDGET,
+                .procname       = "netdev_budget",
+                .data           = &netdev_budget,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec
+        },
         { .ctl_name = 0 }
 };
 
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f3dbc8dc1263..882436da9a3a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1927,6 +1927,25 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
                 return tp->af_specific->setsockopt(sk, level, optname,
                                                    optval, optlen);
 
+        /* This is a string value all the others are int's */
+        if (optname == TCP_CONGESTION) {
+                char name[TCP_CA_NAME_MAX];
+
+                if (optlen < 1)
+                        return -EINVAL;
+
+                val = strncpy_from_user(name, optval,
+                                        min(TCP_CA_NAME_MAX-1, optlen));
+                if (val < 0)
+                        return -EFAULT;
+                name[val] = 0;
+
+                lock_sock(sk);
+                err = tcp_set_congestion_control(tp, name);
+                release_sock(sk);
+                return err;
+        }
+
         if (optlen < sizeof(int))
                 return -EINVAL;
 
@@ -2211,6 +2230,16 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
         case TCP_QUICKACK:
                 val = !tp->ack.pingpong;
                 break;
+
+        case TCP_CONGESTION:
+                if (get_user(len, optlen))
+                        return -EFAULT;
+                len = min_t(unsigned int, len, TCP_CA_NAME_MAX);
+                if (put_user(len, optlen))
+                        return -EFAULT;
+                if (copy_to_user(optval, tp->ca_ops->name, len))
+                        return -EFAULT;
+                return 0;
         default:
                 return -ENOPROTOOPT;
         };
@@ -2224,7 +2253,7 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
 
 
 extern void __skb_cb_too_small_for_tcp(int, int);
-extern void tcpdiag_init(void);
+extern struct tcp_congestion_ops tcp_reno;
 
 static __initdata unsigned long thash_entries;
 static int __init set_thash_entries(char *str)
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 665394a63ae4..4970d10a7785 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -21,7 +21,7 @@ static struct tcp_congestion_ops *tcp_ca_find(const char *name)
 {
         struct tcp_congestion_ops *e;
 
-        list_for_each_entry(e, &tcp_cong_list, list) {
+        list_for_each_entry_rcu(e, &tcp_cong_list, list) {
                 if (strcmp(e->name, name) == 0)
                         return e;
         }
@@ -77,6 +77,9 @@ void tcp_init_congestion_control(struct tcp_sock *tp)
 {
         struct tcp_congestion_ops *ca;
 
+        if (tp->ca_ops != &tcp_init_congestion_ops)
+                return;
+
         rcu_read_lock();
         list_for_each_entry_rcu(ca, &tcp_cong_list, list) {
                 if (try_module_get(ca->owner)) {
@@ -139,6 +142,34 @@ void tcp_get_default_congestion_control(char *name)
         rcu_read_unlock();
 }
 
+/* Change congestion control for socket */
+int tcp_set_congestion_control(struct tcp_sock *tp, const char *name)
+{
+        struct tcp_congestion_ops *ca;
+        int err = 0;
+
+        rcu_read_lock();
+        ca = tcp_ca_find(name);
+        if (ca == tp->ca_ops)
+                goto out;
+
+        if (!ca)
+                err = -ENOENT;
+
+        else if (!try_module_get(ca->owner))
+                err = -EBUSY;
+
+        else {
+                tcp_cleanup_congestion_control(tp);
+                tp->ca_ops = ca;
+                if (tp->ca_ops->init)
+                        tp->ca_ops->init(tp);
+        }
+ out:
+        rcu_read_unlock();
+        return err;
+}
+
 /*
  * TCP Reno congestion control
  * This is special case used for fallback as well.
@@ -192,4 +223,15 @@ struct tcp_congestion_ops tcp_reno = {
         .min_cwnd       = tcp_reno_min_cwnd,
 };
 
-EXPORT_SYMBOL_GPL(tcp_reno);
+/* Initial congestion control used (until SYN)
+ * really reno under another name so we can tell difference
+ * during tcp_set_default_congestion_control
+ */
+struct tcp_congestion_ops tcp_init_congestion_ops  = {
+        .name           = "",
+        .owner          = THIS_MODULE,
+        .ssthresh       = tcp_reno_ssthresh,
+        .cong_avoid     = tcp_reno_cong_avoid,
+        .min_cwnd       = tcp_reno_min_cwnd,
+};
+EXPORT_SYMBOL_GPL(tcp_init_congestion_ops);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 9122814c13ad..ebf112347a97 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2048,7 +2048,7 @@ static int tcp_v4_init_sock(struct sock *sk)
         tp->mss_cache_std = tp->mss_cache = 536;
 
         tp->reordering = sysctl_tcp_reordering;
-        tp->ca_ops = &tcp_reno;
+        tp->ca_ops = &tcp_init_congestion_ops;
 
         sk->sk_state = TCP_CLOSE;
 
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index fce56039b0e9..9dac7fdf4726 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2025,7 +2025,7 @@ static int tcp_v6_init_sock(struct sock *sk)
         sk->sk_state = TCP_CLOSE;
 
         tp->af_specific = &ipv6_specific;
-        tp->ca_ops = &tcp_reno;
+        tp->ca_ops = &tcp_init_congestion_ops;
         sk->sk_write_space = sk_stream_write_space;
         sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
 
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index b22c9beb604d..447b89e556b1 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -449,6 +449,18 @@ config NET_EMATCH_META
           To compile this code as a module, choose M here: the
           module will be called em_meta.
 
+config NET_EMATCH_TEXT
+        tristate "Textsearch"
+        depends on NET_EMATCH
+        select TEXTSEARCH
+        ---help---
+          Say Y here if you want to be ablt to classify packets based on
+          textsearch comparisons. Please select the appropriate textsearch
+          algorithms in the Library section.
+
+          To compile this code as a module, choose M here: the
+          module will be called em_text.
+
 config NET_CLS_ACT
         bool "Packet ACTION"
         depends on EXPERIMENTAL && NET_CLS && NET_QOS
diff --git a/net/sched/Makefile b/net/sched/Makefile
index eb3fe583eba8..8f58cecd6266 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -40,3 +40,4 @@ obj-$(CONFIG_NET_EMATCH_CMP)	+= em_cmp.o
 obj-$(CONFIG_NET_EMATCH_NBYTE)  += em_nbyte.o
 obj-$(CONFIG_NET_EMATCH_U32)    += em_u32.o
 obj-$(CONFIG_NET_EMATCH_META)   += em_meta.o
+obj-$(CONFIG_NET_EMATCH_TEXT)   += em_text.o
diff --git a/net/sched/em_text.c b/net/sched/em_text.c
new file mode 100644
index 000000000000..873840d8d072
--- /dev/null
+++ b/net/sched/em_text.c
@@ -0,0 +1,157 @@
+/*
+ * net/sched/em_text.c  Textsearch ematch
+ *
+ *              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.
+ *
+ * Authors:     Thomas Graf <tgraf@suug.ch>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/textsearch.h>
+#include <linux/tc_ematch/tc_em_text.h>
+#include <net/pkt_cls.h>
+
+struct text_match
+{
+        u16                     from_offset;
+        u16                     to_offset;
+        u8                      from_layer;
+        u8                      to_layer;
+        struct ts_config        *config;
+};
+
+#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)
+
+static int em_text_match(struct sk_buff *skb, struct tcf_ematch *m,
+                         struct tcf_pkt_info *info)
+{
+        struct text_match *tm = EM_TEXT_PRIV(m);
+        int from, to;
+        struct ts_state state;
+
+        from = tcf_get_base_ptr(skb, tm->from_layer) - skb->data;
+        from += tm->from_offset;
+
+        to = tcf_get_base_ptr(skb, tm->to_layer) - skb->data;
+        to += tm->to_offset;
+
+        return skb_find_text(skb, from, to, tm->config, &state) != UINT_MAX;
+}
+
+static int em_text_change(struct tcf_proto *tp, void *data, int len,
+                          struct tcf_ematch *m)
+{
+        struct text_match *tm;
+        struct tcf_em_text *conf = data;
+        struct ts_config *ts_conf;
+        int flags = 0;
+
+        printk("Configuring text: %s from %d:%d to %d:%d len %d\n", conf->algo, conf->from_offset,
+            conf->from_layer, conf->to_offset, conf->to_layer, conf->pattern_len);
+
+        if (len < sizeof(*conf) || len < (sizeof(*conf) + conf->pattern_len))
+                return -EINVAL;
+
+        if (conf->from_layer > conf->to_layer)
+                return -EINVAL;
+
+        if (conf->from_layer == conf->to_layer &&
+            conf->from_offset > conf->to_offset)
+                return -EINVAL;
+
+retry:
+        ts_conf = textsearch_prepare(conf->algo, (u8 *) conf + sizeof(*conf),
+                                     conf->pattern_len, GFP_KERNEL, flags);
+
+        if (flags & TS_AUTOLOAD)
+                rtnl_lock();
+
+        if (IS_ERR(ts_conf)) {
+                if (PTR_ERR(ts_conf) == -ENOENT && !(flags & TS_AUTOLOAD)) {
+                        rtnl_unlock();
+                        flags |= TS_AUTOLOAD;
+                        goto retry;
+                } else
+                        return PTR_ERR(ts_conf);
+        } else if (flags & TS_AUTOLOAD) {
+                textsearch_destroy(ts_conf);
+                return -EAGAIN;
+        }
+
+        tm = kmalloc(sizeof(*tm), GFP_KERNEL);
+        if (tm == NULL) {
+                textsearch_destroy(ts_conf);
+                return -ENOBUFS;
+        }
+
+        tm->from_offset = conf->from_offset;
+        tm->to_offset   = conf->to_offset;
+        tm->from_layer  = conf->from_layer;
+        tm->to_layer    = conf->to_layer;
+        tm->config      = ts_conf;
+
+        m->datalen = sizeof(*tm);
+        m->data = (unsigned long) tm;
+
+        return 0;
+}
+
+static void em_text_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
+{
+        textsearch_destroy(EM_TEXT_PRIV(m)->config);
+}
+
+static int em_text_dump(struct sk_buff *skb, struct tcf_ematch *m)
+{
+        struct text_match *tm = EM_TEXT_PRIV(m);
+        struct tcf_em_text conf;
+
+        strncpy(conf.algo, tm->config->ops->name, sizeof(conf.algo) - 1);
+        conf.from_offset = tm->from_offset;
+        conf.to_offset = tm->to_offset;
+        conf.from_layer = tm->from_layer;
+        conf.to_layer = tm->to_layer;
+        conf.pattern_len = textsearch_get_pattern_len(tm->config);
+        conf.pad = 0;
+
+        RTA_PUT_NOHDR(skb, sizeof(conf), &conf);
+        RTA_APPEND(skb, conf.pattern_len, textsearch_get_pattern(tm->config));
+        return 0;
+
+rtattr_failure:
+        return -1;
+}               
+
+static struct tcf_ematch_ops em_text_ops = {
+        .kind     = TCF_EM_TEXT,
+        .change   = em_text_change,
+        .match    = em_text_match,
+        .destroy  = em_text_destroy,
+        .dump     = em_text_dump,
+        .owner    = THIS_MODULE,
+        .link     = LIST_HEAD_INIT(em_text_ops.link)
+};
+
+static int __init init_em_text(void)
+{
+        return tcf_em_register(&em_text_ops);
+}
+
+static void __exit exit_em_text(void) 
+{
+        tcf_em_unregister(&em_text_ops);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(init_em_text);
+module_exit(exit_em_text);