If CTA_STATUS is present, but CTA_STATUS_MASK is not, then the mask is automatically set to 'status', so that kernel returns those entries that have all of the requested bits set. This makes more sense than using a all-one mask since we'd hardly ever find a match. There are no other checks for status bits, so if e.g. userspace sets impossible combinations it will get an empty dump. If kernel would reject unknown status bits, then a program that works on a future kernel that has IPS_FOO bit fails on old kernels. Same for 'impossible' combinations: Kernel never sets ASSURED without first having set SEEN_REPLY, but its possible that a future kernel could do so. Therefore no sanity tests other than a 0-mask.
Unified · Split
| @@ -56,6 +56,7 @@ enum ctattr_type { · 55 unmodified lines | ||
| 56 | 56 | CTA_LABELS_MASK, |
| 57 | 57 | CTA_SYNPROXY, |
| 58 | 58 | CTA_FILTER, |
| 59 | + CTA_STATUS_MASK, | |
| 59 | 60 | __CTA_MAX |
| 60 | 61 | }; |
| 61 | 62 | #define CTA_MAX (__CTA_MAX - 1) |
| @@ -868,6 +868,7 @@ struct ctnetlink_filter { · 867 unmodified lines | ||
| 868 | 868 | struct nf_conntrack_zone zone; |
| 869 | 869 | |
| 870 | 870 | struct ctnetlink_filter_u32 mark; |
| 871 | + struct ctnetlink_filter_u32 status; | |
| 871 | 872 | }; |
| 872 | 873 | |
| 873 | 874 | static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = { |
| @@ -927,6 +928,28 @@ static int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark, · 53 unmodified lines | ||
| 927 | 928 | return 0; |
| 928 | 929 | } |
| 929 | 930 | |
| 931 | +static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status, | |
| 932 | + const struct nlattr * const cda[]) | |
| 933 | +{ | |
| 934 | + if (cda[CTA_STATUS]) { | |
| 935 | + status->val = ntohl(nla_get_be32(cda[CTA_STATUS])); | |
| 936 | + if (cda[CTA_STATUS_MASK]) | |
| 937 | + status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK])); | |
| 938 | + else | |
| 939 | + status->mask = status->val; | |
| 940 | + | |
| 941 | + /* status->val == 0? always true, else always false. */ | |
| 942 | + if (status->mask == 0) | |
| 943 | + return -EINVAL; | |
| 944 | + } else if (cda[CTA_STATUS_MASK]) { | |
| 945 | + return -EINVAL; | |
| 946 | + } | |
| 947 | + | |
| 948 | + /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */ | |
| 949 | + BUILD_BUG_ON(__IPS_MAX_BIT >= 32); | |
| 950 | + return 0; | |
| 951 | +} | |
| 952 | + | |
| 930 | 953 | static struct ctnetlink_filter * |
| 931 | 954 | ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family) |
| 932 | 955 | { |
| @@ -948,6 +971,10 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family) · 15 unmodified lines | ||
| 948 | 971 | if (err) |
| 949 | 972 | goto err_filter; |
| 950 | 973 | |
| 974 | + err = ctnetlink_filter_parse_status(&filter->status, cda); | |
| 975 | + if (err) | |
| 976 | + goto err_filter; | |
| 977 | + | |
| 951 | 978 | if (!cda[CTA_FILTER]) |
| 952 | 979 | return filter; |
| 953 | 980 | |
| @@ -1001,7 +1028,7 @@ err_filter: · 47 unmodified lines | ||
| 1001 | 1028 | |
| 1002 | 1029 | static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda) |
| 1003 | 1030 | { |
| 1004 | − return family || cda[CTA_MARK] || cda[CTA_FILTER]; | |
| 1031 | + return family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS]; | |
| 1005 | 1032 | } |
| 1006 | 1033 | |
| 1007 | 1034 | static int ctnetlink_start(struct netlink_callback *cb) |
| @@ -1094,6 +1121,7 @@ static int ctnetlink_filter_match(struct nf_conn *ct, void *data) · 86 unmodified lines | ||
| 1094 | 1121 | { |
| 1095 | 1122 | struct ctnetlink_filter *filter = data; |
| 1096 | 1123 | struct nf_conntrack_tuple *tuple; |
| 1124 | + u32 status; | |
| 1097 | 1125 | |
| 1098 | 1126 | if (filter == NULL) |
| 1099 | 1127 | goto out; |
| @@ -1125,6 +1153,9 @@ static int ctnetlink_filter_match(struct nf_conn *ct, void *data) · 25 unmodified lines | ||
| 1125 | 1153 | if ((ct->mark & filter->mark.mask) != filter->mark.val) |
| 1126 | 1154 | goto ignore_entry; |
| 1127 | 1155 | #endif |
| 1156 | + status = (u32)READ_ONCE(ct->status); | |
| 1157 | + if ((status & filter->status.mask) != filter->status.val) | |
| 1158 | + goto ignore_entry; | |
| 1128 | 1159 | |
| 1129 | 1160 | out: |
| 1130 | 1161 | return 1; |
| @@ -1507,6 +1538,7 @@ static const struct nla_policy ct_nla_policy[CTA_MAX+1] = { · 376 unmodified lines | ||
| 1507 | 1538 | [CTA_LABELS_MASK] = { .type = NLA_BINARY, |
| 1508 | 1539 | .len = NF_CT_LABELS_MAX_SIZE }, |
| 1509 | 1540 | [CTA_FILTER] = { .type = NLA_NESTED }, |
| 1541 | + [CTA_STATUS_MASK] = { .type = NLA_U32 }, | |
| 1510 | 1542 | }; |
| 1511 | 1543 | |
| 1512 | 1544 | static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data) |