1 files changed, 176 insertions, 68 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 61291965c5f6..c658cb3bc7c3 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -119,6 +119,25 @@ static inline int verify_sec_ctx_len(struct nlattr **attrs)
         return 0;
 }
 
+static inline int verify_replay(struct xfrm_usersa_info *p,
+                                struct nlattr **attrs)
+{
+        struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
+
+        if ((p->flags & XFRM_STATE_ESN) && !rt)
+                return -EINVAL;
+
+        if (!rt)
+                return 0;
+
+        if (p->id.proto != IPPROTO_ESP)
+                return -EINVAL;
+
+        if (p->replay_window != 0)
+                return -EINVAL;
+
+        return 0;
+}
 
 static int verify_newsa_info(struct xfrm_usersa_info *p,
                              struct nlattr **attrs)
@@ -214,6 +233,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
                 goto out;
         if ((err = verify_sec_ctx_len(attrs)))
                 goto out;
+        if ((err = verify_replay(p, attrs)))
+                goto out;
 
         err = -EINVAL;
         switch (p->mode) {
@@ -234,7 +255,7 @@ out:
 }
 
 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
-                           struct xfrm_algo_desc *(*get_byname)(char *, int),
+                           struct xfrm_algo_desc *(*get_byname)(const char *, int),
                            struct nlattr *rta)
 {
         struct xfrm_algo *p, *ualg;
@@ -345,6 +366,50 @@ static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
         return 0;
 }
 
+static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
+                                         struct nlattr *rp)
+{
+        struct xfrm_replay_state_esn *up;
+
+        if (!replay_esn || !rp)
+                return 0;
+
+        up = nla_data(rp);
+
+        if (xfrm_replay_state_esn_len(replay_esn) !=
+                        xfrm_replay_state_esn_len(up))
+                return -EINVAL;
+
+        return 0;
+}
+
+static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
+                                       struct xfrm_replay_state_esn **preplay_esn,
+                                       struct nlattr *rta)
+{
+        struct xfrm_replay_state_esn *p, *pp, *up;
+
+        if (!rta)
+                return 0;
+
+        up = nla_data(rta);
+
+        p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+
+        pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
+        if (!pp) {
+                kfree(p);
+                return -ENOMEM;
+        }
+
+        *replay_esn = p;
+        *preplay_esn = pp;
+
+        return 0;
+}
+
 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 {
         int len = 0;
@@ -380,10 +445,20 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
 {
         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
+        struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 
+        if (re) {
+                struct xfrm_replay_state_esn *replay_esn;
+                replay_esn = nla_data(re);
+                memcpy(x->replay_esn, replay_esn,
+                       xfrm_replay_state_esn_len(replay_esn));
+                memcpy(x->preplay_esn, replay_esn,
+                       xfrm_replay_state_esn_len(replay_esn));
+        }
+
         if (rp) {
                 struct xfrm_replay_state *replay;
                 replay = nla_data(rp);
@@ -459,7 +534,7 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
 
         xfrm_mark_get(attrs, &x->mark);
 
-        err = xfrm_init_state(x);
+        err = __xfrm_init_state(x, false);
         if (err)
                 goto error;
 
@@ -467,16 +542,19 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
             security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
                 goto error;
 
+        if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
+                                               attrs[XFRMA_REPLAY_ESN_VAL])))
+                goto error;
+
         x->km.seq = p->seq;
         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
         /* sysctl_xfrm_aevent_etime is in 100ms units */
         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
-        x->preplay.bitmap = 0;
-        x->preplay.seq = x->replay.seq+x->replay_maxdiff;
-        x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
 
-        /* override default values from above */
+        if ((err = xfrm_init_replay(x)))
+                goto error;
 
+        /* override default values from above */
         xfrm_update_ae_params(x, attrs);
 
         return x;
@@ -497,9 +575,9 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct xfrm_state *x;
         int err;
         struct km_event c;
-        uid_t loginuid = NETLINK_CB(skb).loginuid;
-        u32 sessionid = NETLINK_CB(skb).sessionid;
-        u32 sid = NETLINK_CB(skb).sid;
+        uid_t loginuid = audit_get_loginuid(current);
+        u32 sessionid = audit_get_sessionid(current);
+        u32 sid;
 
         err = verify_newsa_info(p, attrs);
         if (err)
@@ -515,6 +593,7 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         else
                 err = xfrm_state_update(x);
 
+        security_task_getsecid(current, &sid);
         xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
 
         if (err < 0) {
@@ -575,9 +654,9 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         int err = -ESRCH;
         struct km_event c;
         struct xfrm_usersa_id *p = nlmsg_data(nlh);
-        uid_t loginuid = NETLINK_CB(skb).loginuid;
-        u32 sessionid = NETLINK_CB(skb).sessionid;
-        u32 sid = NETLINK_CB(skb).sid;
+        uid_t loginuid = audit_get_loginuid(current);
+        u32 sessionid = audit_get_sessionid(current);
+        u32 sid;
 
         x = xfrm_user_state_lookup(net, p, attrs, &err);
         if (x == NULL)
@@ -602,6 +681,7 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         km_state_notify(x, &c);
 
 out:
+        security_task_getsecid(current, &sid);
         xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
         xfrm_state_put(x);
         return err;
@@ -705,6 +785,10 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
         if (xfrm_mark_put(skb, &x->mark))
                 goto nla_put_failure;
 
+        if (x->replay_esn)
+                NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
+                        xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn);
+
         if (x->security && copy_sec_ctx(x->security, skb) < 0)
                 goto nla_put_failure;
 
@@ -813,7 +897,7 @@ static int build_spdinfo(struct sk_buff *skb, struct net *net,
         u32 *f;
 
         nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
-        if (nlh == NULL) /* shouldnt really happen ... */
+        if (nlh == NULL) /* shouldn't really happen ... */
                 return -EMSGSIZE;
 
         f = nlmsg_data(nlh);
@@ -873,7 +957,7 @@ static int build_sadinfo(struct sk_buff *skb, struct net *net,
         u32 *f;
 
         nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
-        if (nlh == NULL) /* shouldnt really happen ... */
+        if (nlh == NULL) /* shouldn't really happen ... */
                 return -EMSGSIZE;
 
         f = nlmsg_data(nlh);
@@ -1265,9 +1349,9 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct km_event c;
         int err;
         int excl;
-        uid_t loginuid = NETLINK_CB(skb).loginuid;
-        u32 sessionid = NETLINK_CB(skb).sessionid;
-        u32 sid = NETLINK_CB(skb).sid;
+        uid_t loginuid = audit_get_loginuid(current);
+        u32 sessionid = audit_get_sessionid(current);
+        u32 sid;
 
         err = verify_newpolicy_info(p);
         if (err)
@@ -1280,12 +1364,13 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (!xp)
                 return err;
 
-        /* shouldnt excl be based on nlh flags??
+        /* shouldn't excl be based on nlh flags??
          * Aha! this is anti-netlink really i.e  more pfkey derived
          * in netlink excl is a flag and you wouldnt need
          * a type XFRM_MSG_UPDPOLICY - JHS */
         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
         err = xfrm_policy_insert(p->dir, xp, excl);
+        security_task_getsecid(current, &sid);
         xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
 
         if (err) {
@@ -1522,10 +1607,11 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
                                             NETLINK_CB(skb).pid);
                 }
         } else {
-                uid_t loginuid = NETLINK_CB(skb).loginuid;
-                u32 sessionid = NETLINK_CB(skb).sessionid;
-                u32 sid = NETLINK_CB(skb).sid;
+                uid_t loginuid = audit_get_loginuid(current);
+                u32 sessionid = audit_get_sessionid(current);
+                u32 sid;
 
+                security_task_getsecid(current, &sid);
                 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
                                          sid);
 
@@ -1553,9 +1639,9 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct xfrm_audit audit_info;
         int err;
 
-        audit_info.loginuid = NETLINK_CB(skb).loginuid;
-        audit_info.sessionid = NETLINK_CB(skb).sessionid;
-        audit_info.secid = NETLINK_CB(skb).sid;
+        audit_info.loginuid = audit_get_loginuid(current);
+        audit_info.sessionid = audit_get_sessionid(current);
+        security_task_getsecid(current, &audit_info.secid);
         err = xfrm_state_flush(net, p->proto, &audit_info);
         if (err) {
                 if (err == -ESRCH) /* empty table */
@@ -1572,17 +1658,21 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         return 0;
 }
 
-static inline size_t xfrm_aevent_msgsize(void)
+static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
 {
+        size_t replay_size = x->replay_esn ?
+                              xfrm_replay_state_esn_len(x->replay_esn) :
+                              sizeof(struct xfrm_replay_state);
+
         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
-               + nla_total_size(sizeof(struct xfrm_replay_state))
+               + nla_total_size(replay_size)
                + nla_total_size(sizeof(struct xfrm_lifetime_cur))
                + nla_total_size(sizeof(struct xfrm_mark))
                + nla_total_size(4) /* XFRM_AE_RTHR */
                + nla_total_size(4); /* XFRM_AE_ETHR */
 }
 
-static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
+static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
 {
         struct xfrm_aevent_id *id;
         struct nlmsghdr *nlh;
@@ -1600,7 +1690,13 @@ static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_eve
         id->reqid = x->props.reqid;
         id->flags = c->data.aevent;
 
-        NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
+        if (x->replay_esn)
+                NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
+                        xfrm_replay_state_esn_len(x->replay_esn),
+                        x->replay_esn);
+        else
+                NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
+
         NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
 
         if (id->flags & XFRM_AE_RTHR)
@@ -1633,16 +1729,16 @@ static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct xfrm_aevent_id *p = nlmsg_data(nlh);
         struct xfrm_usersa_id *id = &p->sa_id;
 
-        r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
-        if (r_skb == NULL)
-                return -ENOMEM;
-
         mark = xfrm_mark_get(attrs, &m);
 
         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
-        if (x == NULL) {
-                kfree_skb(r_skb);
+        if (x == NULL)
                 return -ESRCH;
+
+        r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
+        if (r_skb == NULL) {
+                xfrm_state_put(x);
+                return -ENOMEM;
         }
 
         /*
@@ -1674,9 +1770,10 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct xfrm_mark m;
         struct xfrm_aevent_id *p = nlmsg_data(nlh);
         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
+        struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 
-        if (!lt && !rp)
+        if (!lt && !rp && !re)
                 return err;
 
         /* pedantic mode - thou shalt sayeth replaceth */
@@ -1692,6 +1789,10 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (x->km.state != XFRM_STATE_VALID)
                 goto out;
 
+        err = xfrm_replay_verify_len(x->replay_esn, rp);
+        if (err)
+                goto out;
+
         spin_lock_bh(&x->lock);
         xfrm_update_ae_params(x, attrs);
         spin_unlock_bh(&x->lock);
@@ -1720,9 +1821,9 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (err)
                 return err;
 
-        audit_info.loginuid = NETLINK_CB(skb).loginuid;
-        audit_info.sessionid = NETLINK_CB(skb).sessionid;
-        audit_info.secid = NETLINK_CB(skb).sid;
+        audit_info.loginuid = audit_get_loginuid(current);
+        audit_info.sessionid = audit_get_sessionid(current);
+        security_task_getsecid(current, &audit_info.secid);
         err = xfrm_policy_flush(net, type, &audit_info);
         if (err) {
                 if (err == -ESRCH) /* empty table */
@@ -1789,9 +1890,11 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
 
         err = 0;
         if (up->hard) {
-                uid_t loginuid = NETLINK_CB(skb).loginuid;
-                uid_t sessionid = NETLINK_CB(skb).sessionid;
-                u32 sid = NETLINK_CB(skb).sid;
+                uid_t loginuid = audit_get_loginuid(current);
+                u32 sessionid = audit_get_sessionid(current);
+                u32 sid;
+
+                security_task_getsecid(current, &sid);
                 xfrm_policy_delete(xp, p->dir);
                 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
 
@@ -1830,9 +1933,11 @@ static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
         km_state_expired(x, ue->hard, current->pid);
 
         if (ue->hard) {
-                uid_t loginuid = NETLINK_CB(skb).loginuid;
-                uid_t sessionid = NETLINK_CB(skb).sessionid;
-                u32 sid = NETLINK_CB(skb).sid;
+                uid_t loginuid = audit_get_loginuid(current);
+                u32 sessionid = audit_get_sessionid(current);
+                u32 sid;
+
+                security_task_getsecid(current, &sid);
                 __xfrm_state_delete(x);
                 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
         }
@@ -1986,7 +2091,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
 #endif
 
 #ifdef CONFIG_XFRM_MIGRATE
-static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
+static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
 {
         struct xfrm_user_migrate um;
 
@@ -2004,7 +2109,7 @@ static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
 }
 
-static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
+static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
 {
         struct xfrm_user_kmaddress uk;
 
@@ -2025,11 +2130,11 @@ static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
               + userpolicy_type_attrsize();
 }
 
-static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
-                         int num_migrate, struct xfrm_kmaddress *k,
-                         struct xfrm_selector *sel, u8 dir, u8 type)
+static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
+                         int num_migrate, const struct xfrm_kmaddress *k,
+                         const struct xfrm_selector *sel, u8 dir, u8 type)
 {
-        struct xfrm_migrate *mp;
+        const struct xfrm_migrate *mp;
         struct xfrm_userpolicy_id *pol_id;
         struct nlmsghdr *nlh;
         int i;
@@ -2061,9 +2166,9 @@ nlmsg_failure:
         return -EMSGSIZE;
 }
 
-static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
-                             struct xfrm_migrate *m, int num_migrate,
-                             struct xfrm_kmaddress *k)
+static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+                             const struct xfrm_migrate *m, int num_migrate,
+                             const struct xfrm_kmaddress *k)
 {
         struct net *net = &init_net;
         struct sk_buff *skb;
@@ -2079,9 +2184,9 @@ static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
 }
 #else
-static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
-                             struct xfrm_migrate *m, int num_migrate,
-                             struct xfrm_kmaddress *k)
+static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+                             const struct xfrm_migrate *m, int num_migrate,
+                             const struct xfrm_kmaddress *k)
 {
         return -ENOPROTOOPT;
 }
@@ -2137,6 +2242,7 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
+        [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
 };
 
 static struct xfrm_link {
@@ -2220,7 +2326,7 @@ static inline size_t xfrm_expire_msgsize(void)
                + nla_total_size(sizeof(struct xfrm_mark));
 }
 
-static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
+static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
 {
         struct xfrm_user_expire *ue;
         struct nlmsghdr *nlh;
@@ -2242,7 +2348,7 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
-static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
+static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
 {
         struct net *net = xs_net(x);
         struct sk_buff *skb;
@@ -2259,12 +2365,12 @@ static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
 }
 
-static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
+static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
 {
         struct net *net = xs_net(x);
         struct sk_buff *skb;
 
-        skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
+        skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
         if (skb == NULL)
                 return -ENOMEM;
 
@@ -2274,7 +2380,7 @@ static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
 }
 
-static int xfrm_notify_sa_flush(struct km_event *c)
+static int xfrm_notify_sa_flush(const struct km_event *c)
 {
         struct net *net = c->net;
         struct xfrm_usersa_flush *p;
@@ -2318,6 +2424,8 @@ static inline size_t xfrm_sa_len(struct xfrm_state *x)
                 l += nla_total_size(sizeof(*x->encap));
         if (x->tfcpad)
                 l += nla_total_size(sizeof(x->tfcpad));
+        if (x->replay_esn)
+                l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
         if (x->security)
                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
                                     x->security->ctx_len);
@@ -2330,7 +2438,7 @@ static inline size_t xfrm_sa_len(struct xfrm_state *x)
         return l;
 }
 
-static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
+static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
 {
         struct net *net = xs_net(x);
         struct xfrm_usersa_info *p;
@@ -2387,7 +2495,7 @@ nla_put_failure:
         return -1;
 }
 
-static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
+static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
 {
 
         switch (c->event) {
@@ -2546,7 +2654,7 @@ static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
 }
 
 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
-                           int dir, struct km_event *c)
+                           int dir, const struct km_event *c)
 {
         struct xfrm_user_polexpire *upe;
         struct nlmsghdr *nlh;
@@ -2576,7 +2684,7 @@ nlmsg_failure:
         return -EMSGSIZE;
 }
 
-static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
+static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
 {
         struct net *net = xp_net(xp);
         struct sk_buff *skb;
@@ -2591,7 +2699,7 @@ static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_eve
         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
 }
 
-static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
+static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
 {
         struct net *net = xp_net(xp);
         struct xfrm_userpolicy_info *p;
@@ -2656,7 +2764,7 @@ nlmsg_failure:
         return -1;
 }
 
-static int xfrm_notify_policy_flush(struct km_event *c)
+static int xfrm_notify_policy_flush(const struct km_event *c)
 {
         struct net *net = c->net;
         struct nlmsghdr *nlh;
@@ -2681,7 +2789,7 @@ nlmsg_failure:
         return -1;
 }
 
-static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
+static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
 {
 
         switch (c->event) {