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| author | Thomas Graf <tgraf@suug.ch> | 2007-08-22 22:58:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-11 01:48:22 +0200 |
| commit | a7bd9a45c8c8901f800a461a4098ebae2b8a4b78 (patch) | |
| tree | 825a7864c856f3dceaa002143c6c4a63c031a35a /net/xfrm | |
| parent | [XFRM] netlink: Use nlmsg_new() and type-safe size calculation helpers (diff) | |
| download | linux-a7bd9a45c8c8901f800a461a4098ebae2b8a4b78.tar.xz linux-a7bd9a45c8c8901f800a461a4098ebae2b8a4b78.zip | |
[XFRM] netlink: Use nlmsg_parse() to parse attributes
Uses nlmsg_parse() to parse the attributes. This actually changes
behaviour as unknown attributes (type > MAXTYPE) no longer cause
an error. Instead unknown attributes will be ignored henceforth
to keep older kernels compatible with more recent userspace tools.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_user.c | 38 |
1 files changed, 12 insertions, 26 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 783332987491..9103af02473c 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1890,7 +1890,7 @@ static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, } #endif -#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) +#define XMSGSIZE(type) sizeof(struct type) static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), @@ -1906,13 +1906,13 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), - [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), - [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)), - [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)), + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), }; #undef XMSGSIZE @@ -1946,9 +1946,9 @@ static struct xfrm_link { static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { - struct rtattr *xfrma[XFRMA_MAX]; + struct nlattr *xfrma[XFRMA_MAX+1]; struct xfrm_link *link; - int type, min_len; + int type, err; type = nlh->nlmsg_type; if (type > XFRM_MSG_MAX) @@ -1970,30 +1970,16 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL); } - memset(xfrma, 0, sizeof(xfrma)); - - if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) - return -EINVAL; - - if (nlh->nlmsg_len > min_len) { - int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); - struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); - - while (RTA_OK(attr, attrlen)) { - unsigned short flavor = attr->rta_type; - if (flavor) { - if (flavor > XFRMA_MAX) - return -EINVAL; - xfrma[flavor - 1] = attr; - } - attr = RTA_NEXT(attr, attrlen); - } - } + /* FIXME: Temporary hack, nlmsg_parse() starts at xfrma[1], old code + * expects first attribute at xfrma[0] */ + err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma-1, XFRMA_MAX, NULL); + if (err < 0) + return err; if (link->doit == NULL) return -EINVAL; - return link->doit(skb, nlh, xfrma); + return link->doit(skb, nlh, (struct rtattr **) xfrma); } static void xfrm_netlink_rcv(struct sock *sk, int len) |