diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/mpls/af_mpls.c | 49 | ||||
| -rw-r--r-- | net/mpls/internal.h | 2 | ||||
| -rw-r--r-- | net/mpls/mpls_iptunnel.c | 12 |
3 files changed, 47 insertions, 16 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 257ec66009da..f3830951fb1c 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -728,8 +728,8 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt, goto errout; if (newdst) { - err = nla_get_labels(newdst, max_labels, - &nh->nh_labels, nh->nh_label); + err = nla_get_labels(newdst, max_labels, &nh->nh_labels, + nh->nh_label, NULL); if (err) goto errout; } @@ -782,7 +782,8 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, nla = nla_find(attrs, attrlen, RTA_NEWDST); if (nla && - nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, NULL) != 0) + nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, + NULL, NULL) != 0) return 0; *max_labels = max_t(u8, *max_labels, n_labels); @@ -1541,8 +1542,8 @@ int nla_put_labels(struct sk_buff *skb, int attrtype, } EXPORT_SYMBOL_GPL(nla_put_labels); -int nla_get_labels(const struct nlattr *nla, - u8 max_labels, u8 *labels, u32 label[]) +int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, + u32 label[], struct netlink_ext_ack *extack) { unsigned len = nla_len(nla); struct mpls_shim_hdr *nla_label; @@ -1553,13 +1554,18 @@ int nla_get_labels(const struct nlattr *nla, /* len needs to be an even multiple of 4 (the label size). Number * of labels is a u8 so check for overflow. */ - if (len & 3 || len / 4 > 255) + if (len & 3 || len / 4 > 255) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Invalid length for labels attribute"); return -EINVAL; + } /* Limit the number of new labels allowed */ nla_labels = len/4; - if (nla_labels > max_labels) + if (nla_labels > max_labels) { + NL_SET_ERR_MSG(extack, "Too many labels"); return -EINVAL; + } /* when label == NULL, caller wants number of labels */ if (!label) @@ -1574,8 +1580,29 @@ int nla_get_labels(const struct nlattr *nla, /* Ensure the bottom of stack flag is properly set * and ttl and tc are both clear. */ - if ((dec.bos != bos) || dec.ttl || dec.tc) + if (dec.ttl) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "TTL in label must be 0"); + return -EINVAL; + } + + if (dec.tc) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Traffic class in label must be 0"); return -EINVAL; + } + + if (dec.bos != bos) { + NL_SET_BAD_ATTR(extack, nla); + if (bos) { + NL_SET_ERR_MSG(extack, + "BOS bit must be set in first label"); + } else { + NL_SET_ERR_MSG(extack, + "BOS bit can only be set in first label"); + } + return -EINVAL; + } switch (dec.label) { case MPLS_LABEL_IMPLNULL: @@ -1583,6 +1610,8 @@ int nla_get_labels(const struct nlattr *nla, * assign and distribute, but which never * actually appears in the encapsulation. */ + NL_SET_ERR_MSG_ATTR(extack, nla, + "Implicit NULL Label (3) can not be used in encapsulation"); return -EINVAL; } @@ -1696,14 +1725,14 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, case RTA_NEWDST: if (nla_get_labels(nla, MAX_NEW_LABELS, &cfg->rc_output_labels, - cfg->rc_output_label)) + cfg->rc_output_label, NULL)) goto errout; break; case RTA_DST: { u8 label_count; if (nla_get_labels(nla, 1, &label_count, - &cfg->rc_label)) + &cfg->rc_label, NULL)) goto errout; /* Reserved labels may not be set */ diff --git a/net/mpls/internal.h b/net/mpls/internal.h index 4db6a5971322..e59f299ceb3f 100644 --- a/net/mpls/internal.h +++ b/net/mpls/internal.h @@ -203,7 +203,7 @@ static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]); int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, - u32 label[]); + u32 label[], struct netlink_ext_ack *extack); int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, u8 via[]); bool mpls_output_possible(const struct net_device *dev); diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c index 15e1aa708e50..6e558a419f60 100644 --- a/net/mpls/mpls_iptunnel.c +++ b/net/mpls/mpls_iptunnel.c @@ -173,13 +173,14 @@ static int mpls_build_state(struct nlattr *nla, if (ret < 0) return ret; - if (!tb[MPLS_IPTUNNEL_DST]) + if (!tb[MPLS_IPTUNNEL_DST]) { + NL_SET_ERR_MSG(extack, "MPLS_IPTUNNEL_DST attribute is missing"); return -EINVAL; - + } /* determine number of labels */ - if (nla_get_labels(tb[MPLS_IPTUNNEL_DST], - MAX_NEW_LABELS, &n_labels, NULL)) + if (nla_get_labels(tb[MPLS_IPTUNNEL_DST], MAX_NEW_LABELS, + &n_labels, NULL, extack)) return -EINVAL; newts = lwtunnel_state_alloc(sizeof(*tun_encap_info) + @@ -189,7 +190,8 @@ static int mpls_build_state(struct nlattr *nla, tun_encap_info = mpls_lwtunnel_encap(newts); ret = nla_get_labels(tb[MPLS_IPTUNNEL_DST], n_labels, - &tun_encap_info->labels, tun_encap_info->label); + &tun_encap_info->labels, tun_encap_info->label, + extack); if (ret) goto errout; |