ipvs: add sync_maxlen parameter for the sync daemon

Allow setups with large MTU to send large sync packets by
adding sync_maxlen parameter. The default value is now based
on MTU but no more than 1500 for compatibility reasons.

To avoid problems if MTU changes allow fragmentation by
sending packets with DF=0. Problem reported by Dan Carpenter.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 4e3731ee4eac802e24e5d7259d0e4db36566d2f6..2fdc13caf712cd950ee132b0708f9aad73e41d34 100644 (file)
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -846,6 +846,13 @@ struct ipvs_master_sync_state {
 /* How much time to keep dests in trash */
 #define IP_VS_DEST_TRASH_PERIOD                (120 * HZ)
 
+struct ipvs_sync_daemon_cfg {
+       int                     syncid;
+       u16                     sync_maxlen;
+       /* multicast interface name */
+       char                    mcast_ifn[IP_VS_IFNAME_MAXLEN];
+};
+
 /* IPVS in network namespace */
 struct netns_ipvs {
        int                     gen;            /* Generation */
@@ -961,15 +968,10 @@ struct netns_ipvs {
        spinlock_t              sync_buff_lock;
        struct task_struct      **backup_threads;
        int                     threads_mask;
-       int                     send_mesg_maxlen;
-       int                     recv_mesg_maxlen;
        volatile int            sync_state;
-       volatile int            master_syncid;
-       volatile int            backup_syncid;
        struct mutex            sync_mutex;
-       /* multicast interface name */
-       char                    master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
-       char                    backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
+       struct ipvs_sync_daemon_cfg     mcfg;   /* Master Configuration */
+       struct ipvs_sync_daemon_cfg     bcfg;   /* Backup Configuration */
        /* net name space ptr */
        struct net              *net;            /* Needed by timer routines */
        /* Number of heterogeneous destinations, needed becaus heterogeneous
@@ -1408,7 +1410,8 @@ static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
 /* IPVS sync daemon data and function prototypes
  * (from ip_vs_sync.c)
  */
-int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
+int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *cfg,
+                     int state);
 int stop_sync_thread(struct net *net, int state);
 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
 

diff --git a/include/uapi/linux/ip_vs.h b/include/uapi/linux/ip_vs.h
index 3199243f20282050fa992de45f9f627a5a72199e..68377d8c8870dce709fca2fa2a43cb16076e7dbe 100644 (file)
--- a/include/uapi/linux/ip_vs.h
+++ b/include/uapi/linux/ip_vs.h
@@ -406,6 +406,7 @@ enum {
        IPVS_DAEMON_ATTR_STATE,         /* sync daemon state (master/backup) */
        IPVS_DAEMON_ATTR_MCAST_IFN,     /* multicast interface name */
        IPVS_DAEMON_ATTR_SYNC_ID,       /* SyncID we belong to */
+       IPVS_DAEMON_ATTR_SYNC_MAXLEN,   /* UDP Payload Size */
        __IPVS_DAEMON_ATTR_MAX,
 };
 

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index af0b69e411b7e0fc37923872e42c144c0e68391e..96f7bbfd5e1dc63d876e7e08e2b54b7e4cc1b3f9 100644 (file)
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2336,10 +2336,15 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
                struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
 
                if (cmd == IP_VS_SO_SET_STARTDAEMON) {
+                       struct ipvs_sync_daemon_cfg cfg;
+
+                       memset(&cfg, 0, sizeof(cfg));
+                       strlcpy(cfg.mcast_ifn, dm->mcast_ifn,
+                               sizeof(cfg.mcast_ifn));
+                       cfg.syncid = dm->syncid;
                        rtnl_lock();
                        mutex_lock(&ipvs->sync_mutex);
-                       ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
-                                               dm->syncid);
+                       ret = start_sync_thread(net, &cfg, dm->state);
                        mutex_unlock(&ipvs->sync_mutex);
                        rtnl_unlock();
                } else {
@@ -2650,15 +2655,15 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
                mutex_lock(&ipvs->sync_mutex);
                if (ipvs->sync_state & IP_VS_STATE_MASTER) {
                        d[0].state = IP_VS_STATE_MASTER;
-                       strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
+                       strlcpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
                                sizeof(d[0].mcast_ifn));
-                       d[0].syncid = ipvs->master_syncid;
+                       d[0].syncid = ipvs->mcfg.syncid;
                }
                if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
                        d[1].state = IP_VS_STATE_BACKUP;
-                       strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
+                       strlcpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
                                sizeof(d[1].mcast_ifn));
-                       d[1].syncid = ipvs->backup_syncid;
+                       d[1].syncid = ipvs->bcfg.syncid;
                }
                if (copy_to_user(user, &d, sizeof(d)) != 0)
                        ret = -EFAULT;
@@ -2813,6 +2818,7 @@ static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
        [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
                                            .len = IP_VS_IFNAME_MAXLEN },
        [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
+       [IPVS_DAEMON_ATTR_SYNC_MAXLEN]  = { .type = NLA_U16 },
 };
 
 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
@@ -3271,7 +3277,7 @@ static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
 }
 
 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
-                                 const char *mcast_ifn, __u32 syncid)
+                                 struct ipvs_sync_daemon_cfg *c)
 {
        struct nlattr *nl_daemon;
 
@@ -3280,8 +3286,9 @@ static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
                return -EMSGSIZE;
 
        if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
-           nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
-           nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
+           nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
+           nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
+           nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen))
                goto nla_put_failure;
        nla_nest_end(skb, nl_daemon);
 
@@ -3293,7 +3300,7 @@ nla_put_failure:
 }
 
 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
-                                 const char *mcast_ifn, __u32 syncid,
+                                 struct ipvs_sync_daemon_cfg *c,
                                  struct netlink_callback *cb)
 {
        void *hdr;
@@ -3303,7 +3310,7 @@ static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
        if (!hdr)
                return -EMSGSIZE;
 
-       if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
+       if (ip_vs_genl_fill_daemon(skb, state, c))
                goto nla_put_failure;
 
        genlmsg_end(skb, hdr);
@@ -3323,8 +3330,7 @@ static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
        mutex_lock(&ipvs->sync_mutex);
        if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
                if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
-                                          ipvs->master_mcast_ifn,
-                                          ipvs->master_syncid, cb) < 0)
+                                          &ipvs->mcfg, cb) < 0)
                        goto nla_put_failure;
 
                cb->args[0] = 1;
@@ -3332,8 +3338,7 @@ static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
 
        if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
                if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
-                                          ipvs->backup_mcast_ifn,
-                                          ipvs->backup_syncid, cb) < 0)
+                                          &ipvs->bcfg, cb) < 0)
                        goto nla_put_failure;
 
                cb->args[1] = 1;
@@ -3348,25 +3353,33 @@ nla_put_failure:
 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
 {
        struct netns_ipvs *ipvs = net_ipvs(net);
+       struct ipvs_sync_daemon_cfg c;
+       struct nlattr *a;
        int ret;
 
+       memset(&c, 0, sizeof(c));
        if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
              attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
              attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
                return -EINVAL;
+       strlcpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
+               sizeof(c.mcast_ifn));
+       c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
+
+       a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
+       if (a)
+               c.sync_maxlen = nla_get_u16(a);
 
        /* The synchronization protocol is incompatible with mixed family
         * services
         */
-       if (net_ipvs(net)->mixed_address_family_dests > 0)
+       if (ipvs->mixed_address_family_dests > 0)
                return -EINVAL;
 
        rtnl_lock();
        mutex_lock(&ipvs->sync_mutex);
-       ret = start_sync_thread(net,
-                               nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
-                               nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
-                               nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
+       ret = start_sync_thread(net, &c,
+                               nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
        mutex_unlock(&ipvs->sync_mutex);
        rtnl_unlock();
        return ret;

diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 6bc6dca9bca8bf050ae27724e1c7e34596b9cc38..e68a43421479aa5016522165ee576ffd16df30e9 100644 (file)
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -320,26 +320,28 @@ sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
  * Create a new sync buffer for Version 1 proto.
  */
 static inline struct ip_vs_sync_buff *
-ip_vs_sync_buff_create(struct netns_ipvs *ipvs)
+ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
 {
        struct ip_vs_sync_buff *sb;
 
        if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
                return NULL;
 
-       sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
+       len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
+                   ipvs->mcfg.sync_maxlen);
+       sb->mesg = kmalloc(len, GFP_ATOMIC);
        if (!sb->mesg) {
                kfree(sb);
                return NULL;
        }
        sb->mesg->reserved = 0;  /* old nr_conns i.e. must be zero now */
        sb->mesg->version = SYNC_PROTO_VER;
-       sb->mesg->syncid = ipvs->master_syncid;
+       sb->mesg->syncid = ipvs->mcfg.syncid;
        sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
        sb->mesg->nr_conns = 0;
        sb->mesg->spare = 0;
        sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
-       sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen;
+       sb->end = (unsigned char *)sb->mesg + len;
 
        sb->firstuse = jiffies;
        return sb;
@@ -402,7 +404,7 @@ select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
  * Create a new sync buffer for Version 0 proto.
  */
 static inline struct ip_vs_sync_buff *
-ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
+ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
 {
        struct ip_vs_sync_buff *sb;
        struct ip_vs_sync_mesg_v0 *mesg;
@@ -410,17 +412,19 @@ ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
        if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
                return NULL;
 
-       sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
+       len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
+                   ipvs->mcfg.sync_maxlen);
+       sb->mesg = kmalloc(len, GFP_ATOMIC);
        if (!sb->mesg) {
                kfree(sb);
                return NULL;
        }
        mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
        mesg->nr_conns = 0;
-       mesg->syncid = ipvs->master_syncid;
+       mesg->syncid = ipvs->mcfg.syncid;
        mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
        sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
-       sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen;
+       sb->end = (unsigned char *)mesg + len;
        sb->firstuse = jiffies;
        return sb;
 }
@@ -533,7 +537,7 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
        struct ip_vs_sync_buff *buff;
        struct ipvs_master_sync_state *ms;
        int id;
-       int len;
+       unsigned int len;
 
        if (unlikely(cp->af != AF_INET))
                return;
@@ -553,17 +557,19 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
        id = select_master_thread_id(ipvs, cp);
        ms = &ipvs->ms[id];
        buff = ms->sync_buff;
+       len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
+               SIMPLE_CONN_SIZE;
        if (buff) {
                m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
                /* Send buffer if it is for v1 */
-               if (!m->nr_conns) {
+               if (buff->head + len > buff->end || !m->nr_conns) {
                        sb_queue_tail(ipvs, ms);
                        ms->sync_buff = NULL;
                        buff = NULL;
                }
        }
        if (!buff) {
-               buff = ip_vs_sync_buff_create_v0(ipvs);
+               buff = ip_vs_sync_buff_create_v0(ipvs, len);
                if (!buff) {
                        spin_unlock_bh(&ipvs->sync_buff_lock);
                        pr_err("ip_vs_sync_buff_create failed.\n");
@@ -572,8 +578,6 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
                ms->sync_buff = buff;
        }
 
-       len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
-               SIMPLE_CONN_SIZE;
        m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
        s = (struct ip_vs_sync_conn_v0 *) buff->head;
 
@@ -597,12 +601,6 @@ static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
        m->nr_conns++;
        m->size = htons(ntohs(m->size) + len);
        buff->head += len;
-
-       /* check if there is a space for next one */
-       if (buff->head + FULL_CONN_SIZE > buff->end) {
-               sb_queue_tail(ipvs, ms);
-               ms->sync_buff = NULL;
-       }
        spin_unlock_bh(&ipvs->sync_buff_lock);
 
        /* synchronize its controller if it has */
@@ -694,7 +692,7 @@ sloop:
        }
 
        if (!buff) {
-               buff = ip_vs_sync_buff_create(ipvs);
+               buff = ip_vs_sync_buff_create(ipvs, len);
                if (!buff) {
                        spin_unlock_bh(&ipvs->sync_buff_lock);
                        pr_err("ip_vs_sync_buff_create failed.\n");
@@ -1219,7 +1217,7 @@ static void ip_vs_process_message(struct net *net, __u8 *buffer,
                return;
        }
        /* SyncID sanity check */
-       if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) {
+       if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
                IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
                return;
        }
@@ -1319,6 +1317,17 @@ static void set_mcast_ttl(struct sock *sk, u_char ttl)
        release_sock(sk);
 }
 
+/* Control fragmentation of messages */
+static void set_mcast_pmtudisc(struct sock *sk, int val)
+{
+       struct inet_sock *inet = inet_sk(sk);
+
+       /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
+       lock_sock(sk);
+       inet->pmtudisc = val;
+       release_sock(sk);
+}
+
 /*
  *      Specifiy default interface for outgoing multicasts
  */
@@ -1344,43 +1353,6 @@ static int set_mcast_if(struct sock *sk, char *ifname)
 }
 
 
-/*
- *     Set the maximum length of sync message according to the
- *     specified interface's MTU.
- */
-static int set_sync_mesg_maxlen(struct net *net, int sync_state)
-{
-       struct netns_ipvs *ipvs = net_ipvs(net);
-       struct net_device *dev;
-       int num;
-
-       if (sync_state == IP_VS_STATE_MASTER) {
-               dev = __dev_get_by_name(net, ipvs->master_mcast_ifn);
-               if (!dev)
-                       return -ENODEV;
-
-               num = (dev->mtu - sizeof(struct iphdr) -
-                      sizeof(struct udphdr) -
-                      SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
-               ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN +
-                       SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF);
-               IP_VS_DBG(7, "setting the maximum length of sync sending "
-                         "message %d.\n", ipvs->send_mesg_maxlen);
-       } else if (sync_state == IP_VS_STATE_BACKUP) {
-               dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn);
-               if (!dev)
-                       return -ENODEV;
-
-               ipvs->recv_mesg_maxlen = dev->mtu -
-                       sizeof(struct iphdr) - sizeof(struct udphdr);
-               IP_VS_DBG(7, "setting the maximum length of sync receiving "
-                         "message %d.\n", ipvs->recv_mesg_maxlen);
-       }
-
-       return 0;
-}
-
-
 /*
  *      Join a multicast group.
  *      the group is specified by a class D multicast address 224.0.0.0/8
@@ -1461,7 +1433,7 @@ static struct socket *make_send_sock(struct net *net, int id)
                pr_err("Error during creation of socket; terminating\n");
                return ERR_PTR(result);
        }
-       result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn);
+       result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn);
        if (result < 0) {
                pr_err("Error setting outbound mcast interface\n");
                goto error;
@@ -1469,11 +1441,13 @@ static struct socket *make_send_sock(struct net *net, int id)
 
        set_mcast_loop(sock->sk, 0);
        set_mcast_ttl(sock->sk, 1);
+       /* Allow fragmentation if MTU changes */
+       set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
        result = sysctl_sync_sock_size(ipvs);
        if (result > 0)
                set_sock_size(sock->sk, 1, result);
 
-       result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn);
+       result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn);
        if (result < 0) {
                pr_err("Error binding address of the mcast interface\n");
                goto error;
@@ -1531,7 +1505,7 @@ static struct socket *make_receive_sock(struct net *net, int id)
        /* join the multicast group */
        result = join_mcast_group(sock->sk,
                        (struct in_addr *) &mcast_addr.sin_addr,
-                       ipvs->backup_mcast_ifn);
+                       ipvs->bcfg.mcast_ifn);
        if (result < 0) {
                pr_err("Error joining to the multicast group\n");
                goto error;
@@ -1639,7 +1613,7 @@ static int sync_thread_master(void *data)
 
        pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
                "syncid = %d, id = %d\n",
-               ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id);
+               ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
 
        for (;;) {
                sb = next_sync_buff(ipvs, ms);
@@ -1693,7 +1667,7 @@ static int sync_thread_backup(void *data)
 
        pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
                "syncid = %d, id = %d\n",
-               ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id);
+               ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
 
        while (!kthread_should_stop()) {
                wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
@@ -1703,7 +1677,7 @@ static int sync_thread_backup(void *data)
                /* do we have data now? */
                while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
                        len = ip_vs_receive(tinfo->sock, tinfo->buf,
-                                       ipvs->recv_mesg_maxlen);
+                                       ipvs->bcfg.sync_maxlen);
                        if (len <= 0) {
                                if (len != -EAGAIN)
                                        pr_err("receiving message error\n");
@@ -1723,16 +1697,19 @@ static int sync_thread_backup(void *data)
 }
 
 
-int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
+int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *c,
+                     int state)
 {
        struct ip_vs_sync_thread_data *tinfo;
        struct task_struct **array = NULL, *task;
        struct socket *sock;
        struct netns_ipvs *ipvs = net_ipvs(net);
+       struct net_device *dev;
        char *name;
        int (*threadfn)(void *data);
-       int id, count;
+       int id, count, hlen;
        int result = -ENOMEM;
+       u16 mtu, min_mtu;
 
        IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
        IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
@@ -1744,22 +1721,35 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
        } else
                count = ipvs->threads_mask + 1;
 
+       dev = __dev_get_by_name(net, c->mcast_ifn);
+       if (!dev) {
+               pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
+               return -ENODEV;
+       }
+       hlen = sizeof(struct iphdr) + sizeof(struct udphdr);
+       mtu = (state == IP_VS_STATE_BACKUP) ?
+                 clamp(dev->mtu, 1500U, 65535U) : 1500U;
+       min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
+
+       if (c->sync_maxlen)
+               c->sync_maxlen = clamp_t(unsigned int,
+                                        c->sync_maxlen, min_mtu,
+                                        65535 - hlen);
+       else
+               c->sync_maxlen = mtu - hlen;
+
        if (state == IP_VS_STATE_MASTER) {
                if (ipvs->ms)
                        return -EEXIST;
 
-               strlcpy(ipvs->master_mcast_ifn, mcast_ifn,
-                       sizeof(ipvs->master_mcast_ifn));
-               ipvs->master_syncid = syncid;
+               ipvs->mcfg = *c;
                name = "ipvs-m:%d:%d";
                threadfn = sync_thread_master;
        } else if (state == IP_VS_STATE_BACKUP) {
                if (ipvs->backup_threads)
                        return -EEXIST;
 
-               strlcpy(ipvs->backup_mcast_ifn, mcast_ifn,
-                       sizeof(ipvs->backup_mcast_ifn));
-               ipvs->backup_syncid = syncid;
+               ipvs->bcfg = *c;
                name = "ipvs-b:%d:%d";
                threadfn = sync_thread_backup;
        } else {
@@ -1787,7 +1777,6 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
                if (!array)
                        goto out;
        }
-       set_sync_mesg_maxlen(net, state);
 
        tinfo = NULL;
        for (id = 0; id < count; id++) {
@@ -1805,7 +1794,7 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
                tinfo->net = net;
                tinfo->sock = sock;
                if (state == IP_VS_STATE_BACKUP) {
-                       tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen,
+                       tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
                                             GFP_KERNEL);
                        if (!tinfo->buf)
                                goto outtinfo;