patrick/zephyr
1
0
Fork 0
Code Issues Pull requests Actions 7 Packages Projects Releases Wiki Activity

net: ipv6: Calculate checksum before fragmentation

Browse source 
In case the stack has to fragment the IPv6 packet, calculate the
checksum before fragmentation (if haven't done so).

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2023-10-20 11:52:00 +02:00 committed by Fabio Baltieri
parent 887a3a321d
commit 13a22e6814
1 changed files with 27 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
subsys/net/ip/ipv6_fragment.c
View file

@ -635,6 +635,8 @@ static int send_ipv6_fragment(struct net_pkt *pkt,
frag_hdr->id = net_pkt_ipv6_fragment_id(pkt);
frag_hdr->offset = htons(((frag_offset / 8U) << 3) | !final);
net_pkt_set_chksum_done(frag_pkt, true);
if (net_pkt_set_data(frag_pkt, &frag_access)) {
goto fail;
}
@ -720,6 +722,31 @@ int net_ipv6_send_fragmented_pkt(struct net_if *iface, struct net_pkt *pkt,
frag_offset = 0U;
/* Calculate the L4 checksum (if not done already) before the fragmentation. */
if (!net_pkt_is_chksum_done(pkt)) {
net_pkt_cursor_init(pkt);
net_pkt_skip(pkt, last_hdr_off);
switch (next_hdr) {
case IPPROTO_ICMPV6:
ret = net_icmpv6_finalize(pkt, true);
break;
case IPPROTO_TCP:
ret = net_tcp_finalize(pkt, true);
break;
case IPPROTO_UDP:
ret = net_udp_finalize(pkt, true);
break;
default:
ret = 0;
break;
}
if (ret < 0) {
return ret;
}
}
length = net_pkt_get_len(pkt) -
(net_pkt_ip_hdr_len(pkt) + net_pkt_ipv6_ext_len(pkt));
while (length) {