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net: don't explode without a network

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This commit is contained in:
K Lange 2021-10-12 21:15:44 +09:00
parent a8ca76845c
commit 751f78ef2f
1 changed files with 5 additions and 0 deletions
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5
kernel/net/ipv4.c
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@ -226,6 +226,7 @@ static long sock_icmp_send(sock_t * sock, const struct msghdr *msg, int flags) {
struct sockaddr_in * name = msg->msg_name;
fs_node_t * nic = net_if_any();
if (!nic) return -ENONET;
size_t total_length = sizeof(struct ipv4_packet) + msg->msg_iov[0].iov_len;
struct ipv4_packet * response = malloc(total_length);
@ -470,6 +471,7 @@ static long sock_udp_send(sock_t * sock, const struct msghdr *msg, int flags) {
/* Routing: We need a device to send this on... */
fs_node_t * nic = net_if_any();
return 0;
size_t total_length = sizeof(struct ipv4_packet) + msg->msg_iov[0].iov_len + sizeof(struct udp_packet);
@ -581,6 +583,7 @@ static void sock_tcp_close(sock_t * sock) {
size_t total_length = sizeof(struct ipv4_packet) + sizeof(struct tcp_header);
fs_node_t * nic = net_if_any();
if (!nic) return;
struct ipv4_packet * response = malloc(total_length);
response->length = htons(total_length);
@ -717,6 +720,7 @@ static long sock_tcp_connect(sock_t * sock, const struct sockaddr *addr, socklen
memcpy(&sock->dest, addr, addrlen);
fs_node_t * nic = net_if_any();
if (!nic) return -ENONET;
size_t total_length = sizeof(struct ipv4_packet) + sizeof(struct tcp_header);
@ -841,6 +845,7 @@ static long sock_tcp_send(sock_t * sock, const struct msghdr *msg, int flags) {
size_t total_length = sizeof(struct ipv4_packet) + sizeof(struct tcp_header) + size_to_send;
fs_node_t * nic = net_if_any();
if (!nic) return -ENONET;
struct ipv4_packet * response = malloc(total_length);
response->length = htons(total_length);