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net: support some control messages for udp recv

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This commit is contained in:
K. Lange 2024-02-09 15:15:27 +09:00
parent 60bd809a40
commit 335bdf1e72
1 changed files with 17 additions and 11 deletions
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28
kernel/net/ipv4.c
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@ -162,6 +162,20 @@ int net_ipv4_send(struct ipv4_packet * response, fs_node_t * nic) {
return 0;
}
static void sock_ipv4_control_common(sock_t * sock, struct msghdr * msg, struct ipv4_packet * src, int proto) {
/* TODO Other options; priv32[2] should be for flags? */
if (sock->priv32[2] && msg->msg_controllen > sizeof(struct cmsghdr) + 1) {
struct cmsghdr * out = msg->msg_control;
out->cmsg_len = sizeof(struct cmsghdr) + 1;
out->cmsg_level = IPPROTO_IP;
out->cmsg_type = IP_RECVTTL;
out->cmsg_data[0] = src->ttl;
msg->msg_controllen = sizeof(struct cmsghdr) + 1;
} else {
msg->msg_controllen = 0;
}
}
static void icmp_handle(struct ipv4_packet * packet, const char * src, const char * dest, fs_node_t * nic) {
struct icmp_header * header = (void*)&packet->payload;
@ -236,17 +250,7 @@ static long sock_icmp_recv(sock_t * sock, struct msghdr * msg, int flags) {
}
}
/* TODO should check flag IP_RECVTTL ? Also this should be common to all IPPROTO_IP sockets */
if (sock->priv32[2] && msg->msg_controllen > sizeof(struct cmsghdr) + 1) {
struct cmsghdr * out = msg->msg_control;
out->cmsg_len = sizeof(struct cmsghdr) + 1;
out->cmsg_level = IPPROTO_IP;
out->cmsg_type = IP_RECVTTL;
out->cmsg_data[0] = src->ttl;
msg->msg_controllen = sizeof(struct cmsghdr) + 1;
} else {
msg->msg_controllen = 0;
}
sock_ipv4_control_common(sock,msg,src,IPPROTO_ICMP);
memcpy(msg->msg_iov[0].iov_base, src->payload, packet_size);
free(packet);
@ -574,6 +578,8 @@ static long sock_udp_recv(sock_t * sock, struct msghdr * msg, int flags) {
}
}
sock_ipv4_control_common(sock,msg,data,IPPROTO_UDP);
printf("udp: data copied to iov 0, return length?\n");
long resp = ntohs(data->length) - sizeof(struct ipv4_packet) - sizeof(struct udp_packet);