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Subject[iptables v2] extensions: libip6t_srh: support matching previous, next and last SID
Date
This patch extends the libip6t_srh shared library to support matching
previous SID, next SID, and last SID.

Signed-off-by: Ahmed Abdelsalam <amsalam20@gmail.com>
---
extensions/libip6t_srh.c | 287 ++++++++++++++++++++++++++++++--
include/linux/netfilter_ipv6/ip6t_srh.h | 43 ++++-
2 files changed, 314 insertions(+), 16 deletions(-)

diff --git a/extensions/libip6t_srh.c b/extensions/libip6t_srh.c
index ac0ae08..94db6f1 100644
--- a/extensions/libip6t_srh.c
+++ b/extensions/libip6t_srh.c
@@ -22,6 +22,9 @@ enum {
O_SRH_LAST_GT,
O_SRH_LAST_LT,
O_SRH_TAG,
+ O_SRH_PSID,
+ O_SRH_NSID,
+ O_SRH_LSID,
};

static void srh_help(void)
@@ -38,7 +41,10 @@ static void srh_help(void)
"[!] --srh-last-entry-eq last_entry Last Entry value of SRH\n"
"[!] --srh-last-entry-gt last_entry Last Entry value of SRH\n"
"[!] --srh-last-entry-lt last_entry Last Entry value of SRH\n"
-"[!] --srh-tag tag Tag value of SRH\n");
+"[!] --srh-tag tag Tag value of SRH\n"
+"[!] --srh-psid addr[/mask] SRH previous SID\n"
+"[!] --srh-nsid addr[/mask] SRH next SID\n"
+"[!] --srh-lsid addr[/mask] SRH Last SID\n");
}

#define s struct ip6t_srh
@@ -69,6 +75,40 @@ static const struct xt_option_entry srh_opts[] = {
};
#undef s

+#define s struct ip6t_srh1
+static const struct xt_option_entry srh1_opts[] = {
+ { .name = "srh-next-hdr", .id = O_SRH_NEXTHDR, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, next_hdr)},
+ { .name = "srh-hdr-len-eq", .id = O_SRH_LEN_EQ, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
+ { .name = "srh-hdr-len-gt", .id = O_SRH_LEN_GT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
+ { .name = "srh-hdr-len-lt", .id = O_SRH_LEN_LT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdr_len)},
+ { .name = "srh-segs-left-eq", .id = O_SRH_SEGS_EQ, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
+ { .name = "srh-segs-left-gt", .id = O_SRH_SEGS_GT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
+ { .name = "srh-segs-left-lt", .id = O_SRH_SEGS_LT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, segs_left)},
+ { .name = "srh-last-entry-eq", .id = O_SRH_LAST_EQ, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
+ { .name = "srh-last-entry-gt", .id = O_SRH_LAST_GT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
+ { .name = "srh-last-entry-lt", .id = O_SRH_LAST_LT, .type = XTTYPE_UINT8,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, last_entry)},
+ { .name = "srh-tag", .id = O_SRH_TAG, .type = XTTYPE_UINT16,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, tag)},
+ { .name = "srh-psid", .id = O_SRH_PSID, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_INVERT},
+ { .name = "srh-nsid", .id = O_SRH_NSID, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_INVERT},
+ { .name = "srh-lsid", .id = O_SRH_LSID, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_INVERT},
+ { }
+};
+#undef s
+
static void srh_init(struct xt_entry_match *m)
{
struct ip6t_srh *srhinfo = (void *)m->data;
@@ -77,6 +117,20 @@ static void srh_init(struct xt_entry_match *m)
srhinfo->mt_invflags = 0;
}

+static void srh1_init(struct xt_entry_match *m)
+{
+ struct ip6t_srh1 *srhinfo = (void *)m->data;
+
+ srhinfo->mt_flags = 0;
+ srhinfo->mt_invflags = 0;
+ memset(srhinfo->psid_addr.s6_addr, 0, sizeof(srhinfo->psid_addr.s6_addr));
+ memset(srhinfo->nsid_addr.s6_addr, 0, sizeof(srhinfo->nsid_addr.s6_addr));
+ memset(srhinfo->lsid_addr.s6_addr, 0, sizeof(srhinfo->lsid_addr.s6_addr));
+ memset(srhinfo->psid_msk.s6_addr, 0, sizeof(srhinfo->psid_msk.s6_addr));
+ memset(srhinfo->nsid_msk.s6_addr, 0, sizeof(srhinfo->nsid_msk.s6_addr));
+ memset(srhinfo->lsid_msk.s6_addr, 0, sizeof(srhinfo->lsid_msk.s6_addr));
+}
+
static void srh_parse(struct xt_option_call *cb)
{
struct ip6t_srh *srhinfo = cb->data;
@@ -141,6 +195,91 @@ static void srh_parse(struct xt_option_call *cb)
}
}

+static void srh1_parse(struct xt_option_call *cb)
+{
+ struct ip6t_srh1 *srhinfo = cb->data;
+
+ xtables_option_parse(cb);
+ switch (cb->entry->id) {
+ case O_SRH_NEXTHDR:
+ srhinfo->mt_flags |= IP6T_SRH_NEXTHDR;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_NEXTHDR;
+ break;
+ case O_SRH_LEN_EQ:
+ srhinfo->mt_flags |= IP6T_SRH_LEN_EQ;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_EQ;
+ break;
+ case O_SRH_LEN_GT:
+ srhinfo->mt_flags |= IP6T_SRH_LEN_GT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_GT;
+ break;
+ case O_SRH_LEN_LT:
+ srhinfo->mt_flags |= IP6T_SRH_LEN_LT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LEN_LT;
+ break;
+ case O_SRH_SEGS_EQ:
+ srhinfo->mt_flags |= IP6T_SRH_SEGS_EQ;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_EQ;
+ break;
+ case O_SRH_SEGS_GT:
+ srhinfo->mt_flags |= IP6T_SRH_SEGS_GT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_GT;
+ break;
+ case O_SRH_SEGS_LT:
+ srhinfo->mt_flags |= IP6T_SRH_SEGS_LT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_SEGS_LT;
+ break;
+ case O_SRH_LAST_EQ:
+ srhinfo->mt_flags |= IP6T_SRH_LAST_EQ;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_EQ;
+ break;
+ case O_SRH_LAST_GT:
+ srhinfo->mt_flags |= IP6T_SRH_LAST_GT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_GT;
+ break;
+ case O_SRH_LAST_LT:
+ srhinfo->mt_flags |= IP6T_SRH_LAST_LT;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LAST_LT;
+ break;
+ case O_SRH_TAG:
+ srhinfo->mt_flags |= IP6T_SRH_TAG;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_TAG;
+ break;
+ case O_SRH_PSID:
+ srhinfo->mt_flags |= IP6T_SRH_PSID;
+ srhinfo->psid_addr = cb->val.haddr.in6;
+ srhinfo->psid_msk = cb->val.hmask.in6;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_PSID;
+ break;
+ case O_SRH_NSID:
+ srhinfo->mt_flags |= IP6T_SRH_NSID;
+ srhinfo->nsid_addr = cb->val.haddr.in6;
+ srhinfo->nsid_msk = cb->val.hmask.in6;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_NSID;
+ break;
+ case O_SRH_LSID:
+ srhinfo->mt_flags |= IP6T_SRH_LSID;
+ srhinfo->lsid_addr = cb->val.haddr.in6;
+ srhinfo->lsid_msk = cb->val.hmask.in6;
+ if (cb->invert)
+ srhinfo->mt_invflags |= IP6T_SRH_INV_LSID;
+ break;
+ }
+}
+
static void srh_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
@@ -182,6 +321,58 @@ static void srh_print(const void *ip, const struct xt_entry_match *match,
srhinfo->tag);
}

+static void srh1_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+ const struct ip6t_srh1 *srhinfo = (struct ip6t_srh1 *)match->data;
+
+ printf(" srh");
+ if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
+ printf(" next-hdr:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_NEXTHDR ? "!" : "",
+ srhinfo->next_hdr);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
+ printf(" hdr-len-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_EQ ? "!" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
+ printf(" hdr-len-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_GT ? "!" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
+ printf(" hdr-len-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LEN_LT ? "!" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
+ printf(" segs-left-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_EQ ? "!" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
+ printf(" segs-left-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_GT ? "!" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
+ printf(" segs-left-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_LT ? "!" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
+ printf(" last-entry-eq:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_EQ ? "!" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
+ printf(" last-entry-gt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_GT ? "!" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
+ printf(" last-entry-lt:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_LAST_LT ? "!" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_TAG)
+ printf(" tag:%s%d", srhinfo->mt_invflags & IP6T_SRH_INV_TAG ? "!" : "",
+ srhinfo->tag);
+ if (srhinfo->mt_flags & IP6T_SRH_PSID)
+ printf(" psid %s %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_PSID ? "!" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->psid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->psid_msk));
+ if (srhinfo->mt_flags & IP6T_SRH_NSID)
+ printf(" nsid %s %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_NSID ? "!" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->nsid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->nsid_msk));
+ if (srhinfo->mt_flags & IP6T_SRH_LSID)
+ printf(" lsid %s %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_LSID ? "!" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->lsid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->lsid_msk));
+}
+
static void srh_save(const void *ip, const struct xt_entry_match *match)
{
const struct ip6t_srh *srhinfo = (struct ip6t_srh *)match->data;
@@ -221,22 +412,90 @@ static void srh_save(const void *ip, const struct xt_entry_match *match)
srhinfo->tag);
}

-static struct xtables_match srh_mt6_reg = {
- .name = "srh",
- .version = XTABLES_VERSION,
- .family = NFPROTO_IPV6,
- .size = XT_ALIGN(sizeof(struct ip6t_srh)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_srh)),
- .help = srh_help,
- .init = srh_init,
- .print = srh_print,
- .save = srh_save,
- .x6_parse = srh_parse,
- .x6_options = srh_opts,
+static void srh1_save(const void *ip, const struct xt_entry_match *match)
+{
+ const struct ip6t_srh1 *srhinfo = (struct ip6t_srh1 *)match->data;
+
+ if (srhinfo->mt_flags & IP6T_SRH_NEXTHDR)
+ printf("%s --srh-next-hdr %u", (srhinfo->mt_invflags & IP6T_SRH_INV_NEXTHDR) ? " !" : "",
+ srhinfo->next_hdr);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_EQ)
+ printf("%s --srh-hdr-len-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_EQ) ? " !" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_GT)
+ printf("%s --srh-hdr-len-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_GT) ? " !" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_LEN_LT)
+ printf("%s --srh-hdr-len-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LEN_LT) ? " !" : "",
+ srhinfo->hdr_len);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_EQ)
+ printf("%s --srh-segs-left-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_EQ) ? " !" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_GT)
+ printf("%s --srh-segs-left-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_GT) ? " !" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_SEGS_LT)
+ printf("%s --srh-segs-left-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_SEGS_LT) ? " !" : "",
+ srhinfo->segs_left);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_EQ)
+ printf("%s --srh-last-entry-eq %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_EQ) ? " !" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_GT)
+ printf("%s --srh-last-entry-gt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_GT) ? " !" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_LAST_LT)
+ printf("%s --srh-last-entry-lt %u", (srhinfo->mt_invflags & IP6T_SRH_INV_LAST_LT) ? " !" : "",
+ srhinfo->last_entry);
+ if (srhinfo->mt_flags & IP6T_SRH_TAG)
+ printf("%s --srh-tag %u", (srhinfo->mt_invflags & IP6T_SRH_INV_TAG) ? " !" : "",
+ srhinfo->tag);
+ if (srhinfo->mt_flags & IP6T_SRH_PSID)
+ printf("%s --srh-psid %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_PSID ? " !" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->psid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->psid_msk));
+ if (srhinfo->mt_flags & IP6T_SRH_NSID)
+ printf("%s --srh-nsid %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_NSID ? " !" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->nsid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->nsid_msk));
+ if (srhinfo->mt_flags & IP6T_SRH_LSID)
+ printf("%s --srh-lsid %s/%u", srhinfo->mt_invflags & IP6T_SRH_INV_LSID ? " !" : "",
+ xtables_ip6addr_to_numeric(&srhinfo->lsid_addr),
+ xtables_ip6mask_to_cidr(&srhinfo->lsid_msk));
+}
+
+static struct xtables_match srh_mt6_reg[] = {
+ {
+ .name = "srh",
+ .version = XTABLES_VERSION,
+ .revision = 0,
+ .family = NFPROTO_IPV6,
+ .size = XT_ALIGN(sizeof(struct ip6t_srh)),
+ .userspacesize = XT_ALIGN(sizeof(struct ip6t_srh)),
+ .help = srh_help,
+ .init = srh_init,
+ .print = srh_print,
+ .save = srh_save,
+ .x6_parse = srh_parse,
+ .x6_options = srh_opts,
+ },
+ {
+ .name = "srh",
+ .version = XTABLES_VERSION,
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .size = XT_ALIGN(sizeof(struct ip6t_srh1)),
+ .userspacesize = XT_ALIGN(sizeof(struct ip6t_srh1)),
+ .help = srh_help,
+ .init = srh1_init,
+ .print = srh1_print,
+ .save = srh1_save,
+ .x6_parse = srh1_parse,
+ .x6_options = srh1_opts,
+ }
};

void
_init(void)
{
- xtables_register_match(&srh_mt6_reg);
+ xtables_register_matches(srh_mt6_reg, ARRAY_SIZE(srh_mt6_reg));
}
diff --git a/include/linux/netfilter_ipv6/ip6t_srh.h b/include/linux/netfilter_ipv6/ip6t_srh.h
index 087efa1..3bfe411 100644
--- a/include/linux/netfilter_ipv6/ip6t_srh.h
+++ b/include/linux/netfilter_ipv6/ip6t_srh.h
@@ -16,7 +16,10 @@
#define IP6T_SRH_LAST_GT 0x0100
#define IP6T_SRH_LAST_LT 0x0200
#define IP6T_SRH_TAG 0x0400
-#define IP6T_SRH_MASK 0x07FF
+#define IP6T_SRH_PSID 0x0800
+#define IP6T_SRH_NSID 0x1000
+#define IP6T_SRH_LSID 0x2000
+#define IP6T_SRH_MASK 0x3FFF

/* Values for "mt_invflags" field in struct ip6t_srh */
#define IP6T_SRH_INV_NEXTHDR 0x0001
@@ -30,7 +33,10 @@
#define IP6T_SRH_INV_LAST_GT 0x0100
#define IP6T_SRH_INV_LAST_LT 0x0200
#define IP6T_SRH_INV_TAG 0x0400
-#define IP6T_SRH_INV_MASK 0x07FF
+#define IP6T_SRH_INV_PSID 0x0800
+#define IP6T_SRH_INV_NSID 0x1000
+#define IP6T_SRH_INV_LSID 0x2000
+#define IP6T_SRH_INV_MASK 0x3FFF

/**
* struct ip6t_srh - SRH match options
@@ -53,4 +59,37 @@ struct ip6t_srh {
__u16 mt_invflags;
};

+/**
+ * struct ip6t_srh1 - SRH match options (revision 1)
+ * @ next_hdr: Next header field of SRH
+ * @ hdr_len: Extension header length field of SRH
+ * @ segs_left: Segments left field of SRH
+ * @ last_entry: Last entry field of SRH
+ * @ tag: Tag field of SRH
+ * @ psid_addr: Address of previous SID in SRH SID list
+ * @ nsid_addr: Address of NEXT SID in SRH SID list
+ * @ lsid_addr: Address of LAST SID in SRH SID list
+ * @ psid_msk: Mask of previous SID in SRH SID list
+ * @ nsid_msk: Mask of next SID in SRH SID list
+ * @ lsid_msk: MAsk of last SID in SRH SID list
+ * @ mt_flags: match options
+ * @ mt_invflags: Invert the sense of match options
+ */
+
+struct ip6t_srh1 {
+ __u8 next_hdr;
+ __u8 hdr_len;
+ __u8 segs_left;
+ __u8 last_entry;
+ __u16 tag;
+ struct in6_addr psid_addr;
+ struct in6_addr nsid_addr;
+ struct in6_addr lsid_addr;
+ struct in6_addr psid_msk;
+ struct in6_addr nsid_msk;
+ struct in6_addr lsid_msk;
+ __u16 mt_flags;
+ __u16 mt_invflags;
+};
+
#endif /*_IP6T_SRH_H*/
--
2.1.4
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