[PATCH iproute2 net-next v2] tc: m_csum: add support for SCTP checksum

[Davide Caratti]

'sctp' parameter can now be used as 'csum' target to enable CRC32c
computation on SCTP packets.

Signed-off-by: Davide Caratti <dcara...@redhat.com>
---

Notes:
    V2
    - update man/man8/tc-csum.8 to include 'sctp' target

 man/man8/tc-csum.8 |  7 +++++--
 tc/m_csum.c        | 11 ++++++++---
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/man/man8/tc-csum.8 b/man/man8/tc-csum.8
index 3a64c82..f4392a4 100644
--- a/man/man8/tc-csum.8
+++ b/man/man8/tc-csum.8
@@ -19,6 +19,7 @@ csum - checksum update action
 .BR tcp " |"
 .BR udp " |"
 .BR udplite " |"
+.BR sctp " |"
 .IR SWEETS " }"
 
 .ti -8
@@ -43,9 +44,11 @@ IGMP header
 TCP header
 .RB ( tcp ),
 UDP header
-.RB ( udp ") or"
+.RB ( udp ),
 UDPLite header
-.RB ( udplite ).
+.RB ( udplite ") or"
+SCTP header
+.RB ( sctp ).
 .TP
 .B SWEETS
 These are merely syntactic sugar and ignored internally.
diff --git a/tc/m_csum.c b/tc/m_csum.c
index d5b1af6..0ee8cad 100644
--- a/tc/m_csum.c
+++ b/tc/m_csum.c
@@ -24,7 +24,7 @@ explain(void)
 {
        fprintf(stderr, "Usage: ... csum <UPDATE>\n"
                        "Where: UPDATE := <TARGET> [<UPDATE>]\n"
-                       "       TARGET := { ip4h | icmp | igmp | tcp | udp | 
udplite | <SWEETS> }\n"
+                       "       TARGET := { ip4h | icmp | igmp | tcp | udp | 
udplite | sctp | <SWEETS> }\n"
                        "       SWEETS := { and | or | \'+\' }\n");
 }
 
@@ -65,6 +65,9 @@ parse_csum_args(int *argc_p, char ***argv_p, struct tc_csum 
*sel)
                else if (matches(*argv, "udplite") == 0)
                        sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDPLITE;
 
+               else if (matches(*argv, "sctp") == 0)
+                       sel->update_flags |= TCA_CSUM_UPDATE_FLAG_SCTP;
+
                else if ((matches(*argv, "and") == 0) ||
                         (matches(*argv, "or") == 0) ||
                         (matches(*argv, "+") == 0))
@@ -160,6 +163,7 @@ print_csum(struct action_util *au, FILE *f, struct rtattr 
*arg)
        char *uflag_4 = "";
        char *uflag_5 = "";
        char *uflag_6 = "";
+       char *uflag_7 = "";
 
        int uflag_count = 0;
 
@@ -191,13 +195,14 @@ print_csum(struct action_util *au, FILE *f, struct rtattr 
*arg)
        CSUM_UFLAG_BUFFER(uflag_4, TCA_CSUM_UPDATE_FLAG_TCP, "tcp");
        CSUM_UFLAG_BUFFER(uflag_5, TCA_CSUM_UPDATE_FLAG_UDP, "udp");
        CSUM_UFLAG_BUFFER(uflag_6, TCA_CSUM_UPDATE_FLAG_UDPLITE, "udplite");
+       CSUM_UFLAG_BUFFER(uflag_7, TCA_CSUM_UPDATE_FLAG_SCTP, "sctp");
        if (!uflag_count) {
                uflag_1 = "?empty";
        }
 
-       fprintf(f, "csum (%s%s%s%s%s%s) action %s\n",
+       fprintf(f, "csum (%s%s%s%s%s%s%s) action %s\n",
                uflag_1, uflag_2, uflag_3,
-               uflag_4, uflag_5, uflag_6,
+               uflag_4, uflag_5, uflag_6, uflag_7,
                action_n2a(sel->action));
        fprintf(f, "\tindex %u ref %d bind %d", sel->index, sel->refcnt,
                sel->bindcnt);
-- 
2.7.4