From f7b6983f0feeefcd2a594138adcffe640593d8de Mon Sep 17 00:00:00 2001 From: Masahide NAKAMURA Date: Wed, 23 Aug 2006 22:49:28 -0700 Subject: [XFRM] POLICY: Support netlink socket interface for sub policy. Sub policy can be used through netlink socket. PF_KEY uses main only and it is TODO to support sub. Signed-off-by: Masahide NAKAMURA Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/xfrm/xfrm_user.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 121 insertions(+), 13 deletions(-) (limited to 'net/xfrm') diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 7303b820bea..c59a78d2923 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -786,6 +786,22 @@ static int verify_policy_dir(__u8 dir) return 0; } +static int verify_policy_type(__u8 type) +{ + switch (type) { + case XFRM_POLICY_TYPE_MAIN: +#ifdef CONFIG_XFRM_SUB_POLICY + case XFRM_POLICY_TYPE_SUB: +#endif + break; + + default: + return -EINVAL; + }; + + return 0; +} + static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) { switch (p->share) { @@ -879,6 +895,29 @@ static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) return 0; } +static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma) +{ + struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1]; + struct xfrm_userpolicy_type *upt; + __u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + if (rt) { + if (rt->rta_len < sizeof(*upt)) + return -EINVAL; + + upt = RTA_DATA(rt); + type = upt->type; + } + + err = verify_policy_type(type); + if (err) + return err; + + *tp = type; + return 0; +} + static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) { xp->priority = p->priority; @@ -917,16 +956,20 @@ static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, copy_from_user_policy(xp, p); + err = copy_from_user_policy_type(&xp->type, xfrma); + if (err) + goto error; + if (!(err = copy_from_user_tmpl(xp, xfrma))) err = copy_from_user_sec_ctx(xp, xfrma); - - if (err) { - *errp = err; - kfree(xp); - xp = NULL; - } + if (err) + goto error; return xp; + error: + *errp = err; + kfree(xp); + return NULL; } static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) @@ -1037,6 +1080,29 @@ static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *s return 0; } +#ifdef CONFIG_XFRM_SUB_POLICY +static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb) +{ + struct xfrm_userpolicy_type upt; + + memset(&upt, 0, sizeof(upt)); + upt.type = xp->type; + + RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); + + return 0; + +rtattr_failure: + return -1; +} + +#else +static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb) +{ + return 0; +} +#endif + static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) { struct xfrm_dump_info *sp = ptr; @@ -1060,6 +1126,8 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr goto nlmsg_failure; if (copy_to_user_sec_ctx(xp, skb)) goto nlmsg_failure; + if (copy_to_user_policy_type(xp, skb) < 0) + goto nlmsg_failure; nlh->nlmsg_len = skb->tail - b; out: @@ -1081,7 +1149,10 @@ static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) info.nlmsg_flags = NLM_F_MULTI; info.this_idx = 0; info.start_idx = cb->args[0]; - (void) xfrm_policy_walk(dump_one_policy, &info); + (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info); +#ifdef CONFIG_XFRM_SUB_POLICY + (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info); +#endif cb->args[0] = info.this_idx; return skb->len; @@ -1117,6 +1188,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr { struct xfrm_policy *xp; struct xfrm_userpolicy_id *p; + __u8 type = XFRM_POLICY_TYPE_MAIN; int err; struct km_event c; int delete; @@ -1124,12 +1196,16 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr p = NLMSG_DATA(nlh); delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; + err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); + if (err) + return err; + err = verify_policy_dir(p->dir); if (err) return err; if (p->index) - xp = xfrm_policy_byid(p->dir, p->index, delete); + xp = xfrm_policy_byid(type, p->dir, p->index, delete); else { struct rtattr **rtattrs = (struct rtattr **)xfrma; struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; @@ -1146,7 +1222,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr if ((err = security_xfrm_policy_alloc(&tmp, uctx))) return err; } - xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete); + xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete); security_xfrm_policy_free(&tmp); } if (xp == NULL) @@ -1329,9 +1405,16 @@ out: static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) { -struct km_event c; + struct km_event c; + __u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); + if (err) + return err; - xfrm_policy_flush(); + xfrm_policy_flush(type); + c.data.type = type; c.event = nlh->nlmsg_type; c.seq = nlh->nlmsg_seq; c.pid = nlh->nlmsg_pid; @@ -1344,10 +1427,15 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void * struct xfrm_policy *xp; struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); struct xfrm_userpolicy_info *p = &up->pol; + __u8 type = XFRM_POLICY_TYPE_MAIN; int err = -ENOENT; + err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); + if (err) + return err; + if (p->index) - xp = xfrm_policy_byid(p->dir, p->index, 0); + xp = xfrm_policy_byid(type, p->dir, p->index, 0); else { struct rtattr **rtattrs = (struct rtattr **)xfrma; struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; @@ -1364,7 +1452,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void * if ((err = security_xfrm_policy_alloc(&tmp, uctx))) return err; } - xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0); + xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0); security_xfrm_policy_free(&tmp); } @@ -1818,6 +1906,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, goto nlmsg_failure; if (copy_to_user_state_sec_ctx(x, skb)) goto nlmsg_failure; + if (copy_to_user_policy_type(xp, skb) < 0) + goto nlmsg_failure; nlh->nlmsg_len = skb->tail - b; return skb->len; @@ -1898,6 +1988,7 @@ static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, } copy_from_user_policy(xp, p); + xp->type = XFRM_POLICY_TYPE_MAIN; copy_templates(xp, ut, nr); if (!xp->security) { @@ -1931,6 +2022,8 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, goto nlmsg_failure; if (copy_to_user_sec_ctx(xp, skb)) goto nlmsg_failure; + if (copy_to_user_policy_type(xp, skb) < 0) + goto nlmsg_failure; upe->hard = !!hard; nlh->nlmsg_len = skb->tail - b; @@ -2002,6 +2095,8 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event * copy_to_user_policy(xp, p, dir); if (copy_to_user_tmpl(xp, skb) < 0) goto nlmsg_failure; + if (copy_to_user_policy_type(xp, skb) < 0) + goto nlmsg_failure; nlh->nlmsg_len = skb->tail - b; @@ -2019,6 +2114,9 @@ static int xfrm_notify_policy_flush(struct km_event *c) struct nlmsghdr *nlh; struct sk_buff *skb; unsigned char *b; +#ifdef CONFIG_XFRM_SUB_POLICY + struct xfrm_userpolicy_type upt; +#endif int len = NLMSG_LENGTH(0); skb = alloc_skb(len, GFP_ATOMIC); @@ -2028,6 +2126,13 @@ static int xfrm_notify_policy_flush(struct km_event *c) nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); + nlh->nlmsg_flags = 0; + +#ifdef CONFIG_XFRM_SUB_POLICY + memset(&upt, 0, sizeof(upt)); + upt.type = c->data.type; + RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); +#endif nlh->nlmsg_len = skb->tail - b; @@ -2035,6 +2140,9 @@ static int xfrm_notify_policy_flush(struct km_event *c) return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); nlmsg_failure: +#ifdef CONFIG_XFRM_SUB_POLICY +rtattr_failure: +#endif kfree_skb(skb); return -1; } -- cgit v1.2.3