4 files changed, 116 insertions, 212 deletions

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 1650b64415..30af4a4dfc 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -448,24 +448,22 @@ config INET_TCP_DIAG
         depends on INET_DIAG
         def_tristate INET_DIAG
 
-config TCP_CONG_ADVANCED
+menuconfig TCP_CONG_ADVANCED
         bool "TCP: advanced congestion control"
         ---help---
           Support for selection of various TCP congestion control
           modules.
 
           Nearly all users can safely say no here, and a safe default
-          selection will be made (BIC-TCP with new Reno as a fallback).
+          selection will be made (CUBIC with new Reno as a fallback).
 
           If unsure, say N.
 
-# TCP Reno is builtin (required as fallback)
-menu "TCP congestion control"
-        depends on TCP_CONG_ADVANCED
+if TCP_CONG_ADVANCED
 
 config TCP_CONG_BIC
         tristate "Binary Increase Congestion (BIC) control"
-        default y
+        default m
         ---help---
         BIC-TCP is a sender-side only change that ensures a linear RTT
         fairness under large windows while offering both scalability and
@@ -479,7 +477,7 @@ config TCP_CONG_BIC
 
 config TCP_CONG_CUBIC
         tristate "CUBIC TCP"
-        default m
+        default y
         ---help---
         This is version 2.0 of BIC-TCP which uses a cubic growth function
         among other techniques.
@@ -574,12 +572,49 @@ config TCP_CONG_VENO
         loss packets.
         See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
 
-endmenu
+choice
+        prompt "Default TCP congestion control"
+        default DEFAULT_CUBIC
+        help
+          Select the TCP congestion control that will be used by default
+          for all connections.
 
-config TCP_CONG_BIC
+        config DEFAULT_BIC
+                bool "Bic" if TCP_CONG_BIC=y
+
+        config DEFAULT_CUBIC
+                bool "Cubic" if TCP_CONG_CUBIC=y
+
+        config DEFAULT_HTCP
+                bool "Htcp" if TCP_CONG_HTCP=y
+
+        config DEFAULT_VEGAS
+                bool "Vegas" if TCP_CONG_VEGAS=y
+
+        config DEFAULT_WESTWOOD
+                bool "Westwood" if TCP_CONG_WESTWOOD=y
+
+        config DEFAULT_RENO
+                bool "Reno"
+
+endchoice
+
+endif
+
+config TCP_CONG_CUBIC
         tristate
         depends on !TCP_CONG_ADVANCED
         default y
 
+config DEFAULT_TCP_CONG
+        string
+        default "bic" if DEFAULT_BIC
+        default "cubic" if DEFAULT_CUBIC
+        default "htcp" if DEFAULT_HTCP
+        default "vegas" if DEFAULT_VEGAS
+        default "westwood" if DEFAULT_WESTWOOD
+        default "reno" if DEFAULT_RENO
+        default "cubic"
+
 source "net/ipv4/ipvs/Kconfig"
 
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 80a2a0911b..e6ce0b3ba6 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -259,7 +259,7 @@ void cipso_v4_cache_invalidate(void)
         u32 iter;
 
         for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) {
-                spin_lock(&cipso_v4_cache[iter].lock);
+                spin_lock_bh(&cipso_v4_cache[iter].lock);
                 list_for_each_entry_safe(entry,
                                          tmp_entry,
                                          &cipso_v4_cache[iter].list, list) {
@@ -267,7 +267,7 @@ void cipso_v4_cache_invalidate(void)
                         cipso_v4_cache_entry_free(entry);
                 }
                 cipso_v4_cache[iter].size = 0;
-                spin_unlock(&cipso_v4_cache[iter].lock);
+                spin_unlock_bh(&cipso_v4_cache[iter].lock);
         }
 
         return;
@@ -309,7 +309,7 @@ static int cipso_v4_cache_check(const unsigned char *key,
 
         hash = cipso_v4_map_cache_hash(key, key_len);
         bkt = hash & (CIPSO_V4_CACHE_BUCKETBITS - 1);
-        spin_lock(&cipso_v4_cache[bkt].lock);
+        spin_lock_bh(&cipso_v4_cache[bkt].lock);
         list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) {
                 if (entry->hash == hash &&
                     entry->key_len == key_len &&
@@ -318,7 +318,7 @@ static int cipso_v4_cache_check(const unsigned char *key,
                         secattr->cache.free = entry->lsm_data.free;
                         secattr->cache.data = entry->lsm_data.data;
                         if (prev_entry == NULL) {
-                                spin_unlock(&cipso_v4_cache[bkt].lock);
+                                spin_unlock_bh(&cipso_v4_cache[bkt].lock);
                                 return 0;
                         }
 
@@ -333,12 +333,12 @@ static int cipso_v4_cache_check(const unsigned char *key,
                                            &prev_entry->list);
                         }
 
-                        spin_unlock(&cipso_v4_cache[bkt].lock);
+                        spin_unlock_bh(&cipso_v4_cache[bkt].lock);
                         return 0;
                 }
                 prev_entry = entry;
         }
-        spin_unlock(&cipso_v4_cache[bkt].lock);
+        spin_unlock_bh(&cipso_v4_cache[bkt].lock);
 
         return -ENOENT;
 }
@@ -387,7 +387,7 @@ int cipso_v4_cache_add(const struct sk_buff *skb,
         entry->lsm_data.data = secattr->cache.data;
 
         bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETBITS - 1);
-        spin_lock(&cipso_v4_cache[bkt].lock);
+        spin_lock_bh(&cipso_v4_cache[bkt].lock);
         if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) {
                 list_add(&entry->list, &cipso_v4_cache[bkt].list);
                 cipso_v4_cache[bkt].size += 1;
@@ -398,7 +398,7 @@ int cipso_v4_cache_add(const struct sk_buff *skb,
                 list_add(&entry->list, &cipso_v4_cache[bkt].list);
                 cipso_v4_cache_entry_free(old_entry);
         }
-        spin_unlock(&cipso_v4_cache[bkt].lock);
+        spin_unlock_bh(&cipso_v4_cache[bkt].lock);
 
         return 0;
 
@@ -530,197 +530,42 @@ struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 }
 
 /**
- * cipso_v4_doi_dump_all - Dump all the CIPSO DOI definitions into a sk_buff
- * @headroom: the amount of headroom to allocate for the sk_buff
+ * cipso_v4_doi_walk - Iterate through the DOI definitions
+ * @skip_cnt: skip past this number of DOI definitions, updated
+ * @callback: callback for each DOI definition
+ * @cb_arg: argument for the callback function
  *
  * Description:
- * Dump a list of all the configured DOI values into a sk_buff.  The returned
- * sk_buff has room at the front of the sk_buff for @headroom bytes.  See
- * net/netlabel/netlabel_cipso_v4.h for the LISTALL message format.  This
- * function may fail if another process is changing the DOI list at the same
- * time.  Returns a pointer to a sk_buff on success, NULL on error.
+ * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
+ * For each entry call @callback, if @callback returns a negative value stop
+ * 'walking' through the list and return.  Updates the value in @skip_cnt upon
+ * return.  Returns zero on success, negative values on failure.
  *
  */
-struct sk_buff *cipso_v4_doi_dump_all(size_t headroom)
+int cipso_v4_doi_walk(u32 *skip_cnt,
+                     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
+                     void *cb_arg)
 {
-        struct sk_buff *skb = NULL;
-        struct cipso_v4_doi *iter;
+        int ret_val = -ENOENT;
         u32 doi_cnt = 0;
-        ssize_t buf_len;
+        struct cipso_v4_doi *iter_doi;
 
-        buf_len = NETLBL_LEN_U32;
         rcu_read_lock();
-        list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
-                if (iter->valid) {
-                        doi_cnt += 1;
-                        buf_len += 2 * NETLBL_LEN_U32;
-                }
-
-        skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
-        if (skb == NULL)
-                goto doi_dump_all_failure;
-
-        if (nla_put_u32(skb, NLA_U32, doi_cnt) != 0)
-                goto doi_dump_all_failure;
-        buf_len -= NETLBL_LEN_U32;
-        list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list)
-                if (iter->valid) {
-                        if (buf_len < 2 * NETLBL_LEN_U32)
-                                goto doi_dump_all_failure;
-                        if (nla_put_u32(skb, NLA_U32, iter->doi) != 0)
-                                goto doi_dump_all_failure;
-                        if (nla_put_u32(skb, NLA_U32, iter->type) != 0)
-                                goto doi_dump_all_failure;
-                        buf_len -= 2 * NETLBL_LEN_U32;
-                }
-        rcu_read_unlock();
-
-        return skb;
-
-doi_dump_all_failure:
-        rcu_read_unlock();
-        kfree(skb);
-        return NULL;
-}
-
-/**
- * cipso_v4_doi_dump - Dump a CIPSO DOI definition into a sk_buff
- * @doi: the DOI value
- * @headroom: the amount of headroom to allocate for the sk_buff
- *
- * Description:
- * Lookup the DOI definition matching @doi and dump it's contents into a
- * sk_buff.  The returned sk_buff has room at the front of the sk_buff for
- * @headroom bytes.  See net/netlabel/netlabel_cipso_v4.h for the LIST message
- * format.  This function may fail if another process is changing the DOI list
- * at the same time.  Returns a pointer to a sk_buff on success, NULL on error.
- *
- */
-struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom)
-{
-        struct sk_buff *skb = NULL;
-        struct cipso_v4_doi *iter;
-        u32 tag_cnt = 0;
-        u32 lvl_cnt = 0;
-        u32 cat_cnt = 0;
-        ssize_t buf_len;
-        ssize_t tmp;
-
-        rcu_read_lock();
-        iter = cipso_v4_doi_getdef(doi);
-        if (iter == NULL)
-                goto doi_dump_failure;
-        buf_len = NETLBL_LEN_U32;
-        switch (iter->type) {
-        case CIPSO_V4_MAP_PASS:
-                buf_len += NETLBL_LEN_U32;
-                while(tag_cnt < CIPSO_V4_TAG_MAXCNT &&
-                      iter->tags[tag_cnt] != CIPSO_V4_TAG_INVALID) {
-                        tag_cnt += 1;
-                        buf_len += NETLBL_LEN_U8;
-                }
-                break;
-        case CIPSO_V4_MAP_STD:
-                buf_len += 3 * NETLBL_LEN_U32;
-                while (tag_cnt < CIPSO_V4_TAG_MAXCNT &&
-                       iter->tags[tag_cnt] != CIPSO_V4_TAG_INVALID) {
-                        tag_cnt += 1;
-                        buf_len += NETLBL_LEN_U8;
-                }
-                for (tmp = 0; tmp < iter->map.std->lvl.local_size; tmp++)
-                        if (iter->map.std->lvl.local[tmp] !=
-                            CIPSO_V4_INV_LVL) {
-                                lvl_cnt += 1;
-                                buf_len += NETLBL_LEN_U32 + NETLBL_LEN_U8;
-                        }
-                for (tmp = 0; tmp < iter->map.std->cat.local_size; tmp++)
-                        if (iter->map.std->cat.local[tmp] !=
-                            CIPSO_V4_INV_CAT) {
-                                cat_cnt += 1;
-                                buf_len += NETLBL_LEN_U32 + NETLBL_LEN_U16;
+        list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list)
+                if (iter_doi->valid) {
+                        if (doi_cnt++ < *skip_cnt)
+                                continue;
+                        ret_val = callback(iter_doi, cb_arg);
+                        if (ret_val < 0) {
+                                doi_cnt--;
+                                goto doi_walk_return;
                         }
-                break;
-        }
-
-        skb = netlbl_netlink_alloc_skb(headroom, buf_len, GFP_ATOMIC);
-        if (skb == NULL)
-                goto doi_dump_failure;
-
-        if (nla_put_u32(skb, NLA_U32, iter->type) != 0)
-                goto doi_dump_failure;
-        buf_len -= NETLBL_LEN_U32;
-        if (iter != cipso_v4_doi_getdef(doi))
-                goto doi_dump_failure;
-        switch (iter->type) {
-        case CIPSO_V4_MAP_PASS:
-                if (nla_put_u32(skb, NLA_U32, tag_cnt) != 0)
-                        goto doi_dump_failure;
-                buf_len -= NETLBL_LEN_U32;
-                for (tmp = 0;
-                     tmp < CIPSO_V4_TAG_MAXCNT &&
-                             iter->tags[tmp] != CIPSO_V4_TAG_INVALID;
-                     tmp++) {
-                        if (buf_len < NETLBL_LEN_U8)
-                                goto doi_dump_failure;
-                        if (nla_put_u8(skb, NLA_U8, iter->tags[tmp]) != 0)
-                                goto doi_dump_failure;
-                        buf_len -= NETLBL_LEN_U8;
                 }
-                break;
-        case CIPSO_V4_MAP_STD:
-                if (nla_put_u32(skb, NLA_U32, tag_cnt) != 0)
-                        goto doi_dump_failure;
-                if (nla_put_u32(skb, NLA_U32, lvl_cnt) != 0)
-                        goto doi_dump_failure;
-                if (nla_put_u32(skb, NLA_U32, cat_cnt) != 0)
-                        goto doi_dump_failure;
-                buf_len -= 3 * NETLBL_LEN_U32;
-                for (tmp = 0;
-                     tmp < CIPSO_V4_TAG_MAXCNT &&
-                             iter->tags[tmp] != CIPSO_V4_TAG_INVALID;
-                     tmp++) {
-                        if (buf_len < NETLBL_LEN_U8)
-                                goto doi_dump_failure;
-                        if (nla_put_u8(skb, NLA_U8, iter->tags[tmp]) != 0)
-                                goto doi_dump_failure;
-                        buf_len -= NETLBL_LEN_U8;
-                }
-                for (tmp = 0; tmp < iter->map.std->lvl.local_size; tmp++)
-                        if (iter->map.std->lvl.local[tmp] !=
-                            CIPSO_V4_INV_LVL) {
-                                if (buf_len < NETLBL_LEN_U32 + NETLBL_LEN_U8)
-                                        goto doi_dump_failure;
-                                if (nla_put_u32(skb, NLA_U32, tmp) != 0)
-                                        goto doi_dump_failure;
-                                if (nla_put_u8(skb,
-                                           NLA_U8,
-                                           iter->map.std->lvl.local[tmp]) != 0)
-                                        goto doi_dump_failure;
-                                buf_len -= NETLBL_LEN_U32 + NETLBL_LEN_U8;
-                        }
-                for (tmp = 0; tmp < iter->map.std->cat.local_size; tmp++)
-                        if (iter->map.std->cat.local[tmp] !=
-                            CIPSO_V4_INV_CAT) {
-                                if (buf_len < NETLBL_LEN_U32 + NETLBL_LEN_U16)
-                                        goto doi_dump_failure;
-                                if (nla_put_u32(skb, NLA_U32, tmp) != 0)
-                                        goto doi_dump_failure;
-                                if (nla_put_u16(skb,
-                                           NLA_U16,
-                                           iter->map.std->cat.local[tmp]) != 0)
-                                        goto doi_dump_failure;
-                                buf_len -= NETLBL_LEN_U32 + NETLBL_LEN_U16;
-                        }
-                break;
-        }
-        rcu_read_unlock();
-
-        return skb;
 
-doi_dump_failure:
+doi_walk_return:
         rcu_read_unlock();
-        kfree(skb);
-        return NULL;
+        *skip_cnt = doi_cnt;
+        return ret_val;
 }
 
 /**
@@ -1486,43 +1331,40 @@ socket_setattr_failure:
 }
 
 /**
- * cipso_v4_socket_getattr - Get the security attributes from a socket
- * @sock: the socket
+ * cipso_v4_sock_getattr - Get the security attributes from a sock
+ * @sk: the sock
  * @secattr: the security attributes
  *
  * Description:
- * Query @sock to see if there is a CIPSO option attached to the socket and if
- * there is return the CIPSO security attributes in @secattr.  Returns zero on
- * success and negative values on failure.
+ * Query @sk to see if there is a CIPSO option attached to the sock and if
+ * there is return the CIPSO security attributes in @secattr.  This function
+ * requires that @sk be locked, or privately held, but it does not do any
+ * locking itself.  Returns zero on success and negative values on failure.
  *
  */
-int cipso_v4_socket_getattr(const struct socket *sock,
-                            struct netlbl_lsm_secattr *secattr)
+int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
 {
         int ret_val = -ENOMSG;
-        struct sock *sk;
         struct inet_sock *sk_inet;
         unsigned char *cipso_ptr;
         u32 doi;
         struct cipso_v4_doi *doi_def;
 
-        sk = sock->sk;
-        lock_sock(sk);
         sk_inet = inet_sk(sk);
         if (sk_inet->opt == NULL || sk_inet->opt->cipso == 0)
-                goto socket_getattr_return;
+                return -ENOMSG;
         cipso_ptr = sk_inet->opt->__data + sk_inet->opt->cipso -
                 sizeof(struct iphdr);
         ret_val = cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr);
         if (ret_val == 0)
-                goto socket_getattr_return;
+                return ret_val;
 
         doi = ntohl(*(u32 *)&cipso_ptr[2]);
         rcu_read_lock();
         doi_def = cipso_v4_doi_getdef(doi);
         if (doi_def == NULL) {
                 rcu_read_unlock();
-                goto socket_getattr_return;
+                return -ENOMSG;
         }
         switch (cipso_ptr[6]) {
         case CIPSO_V4_TAG_RBITMAP:
@@ -1533,8 +1375,29 @@ int cipso_v4_socket_getattr(const struct socket *sock,
         }
         rcu_read_unlock();
 
-socket_getattr_return:
-        release_sock(sk);
+        return ret_val;
+}
+
+/**
+ * cipso_v4_socket_getattr - Get the security attributes from a socket
+ * @sock: the socket
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Query @sock to see if there is a CIPSO option attached to the socket and if
+ * there is return the CIPSO security attributes in @secattr.  Returns zero on
+ * success and negative values on failure.
+ *
+ */
+int cipso_v4_socket_getattr(const struct socket *sock,
+                            struct netlbl_lsm_secattr *secattr)
+{
+        int ret_val;
+
+        lock_sock(sock->sk);
+        ret_val = cipso_v4_sock_getattr(sock->sk, secattr);
+        release_sock(sock->sk);
+
         return ret_val;
 }
 
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 19b2071ff3..e82a5be894 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -129,6 +129,12 @@ static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
         return ret;
 }
 
+static int __init tcp_congestion_default(void)
+{
+        return tcp_set_default_congestion_control(CONFIG_DEFAULT_TCP_CONG);
+}
+
+late_initcall(tcp_congestion_default);
 
 ctl_table ipv4_table[] = {
         {
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 7ff2e4273a..af0aca1e6b 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -48,7 +48,7 @@ int tcp_register_congestion_control(struct tcp_congestion_ops *ca)
                 printk(KERN_NOTICE "TCP %s already registered\n", ca->name);
                 ret = -EEXIST;
         } else {
-                list_add_rcu(&ca->list, &tcp_cong_list);
+                list_add_tail_rcu(&ca->list, &tcp_cong_list);
                 printk(KERN_INFO "TCP %s registered\n", ca->name);
         }
         spin_unlock(&tcp_cong_list_lock);