icmp_push_reply(icmp_param,&ipc, &rt); ip_rt_put(rt); out_unlock: icmp_xmit_unlock(sk); } a) 速率控制函数icmpv4_xrlim_allow 对于速率控制函数,主要是由两个函数完成icmpv4_xrlim_allow、xrlim_allow。 其中xrlim_allow是进行真正的限速操作;而icmpv4_xrlim_allow主要是返回是否成功,其对于不需...
对于源数据包时多播的数据包,不发送icmp error 报文。 对于源数据包有分段时,仅针对首个报文发送icmp error报文。 对于源数据包本身就是icmp error类型的报文,不发送icmp error报文。 流程: 查找路由 当路由查找成功之后,调用icmp_push_reply()将数据发送出去。void __icmp_send(struct ...
room -= sizeof(struct icmphdr); icmp_param->data_len = skb_in->len - icmp_param->offset; if (icmp_param->data_len > room) icmp_param->data_len = room; icmp_param->head_len = sizeof(struct icmphdr); icmp_push_reply(icmp_param, &fl4, &ipc, &rt); ende: ip_rt_put(rt);...
发送icmp应答函数staticvoidicmp_push_reply(structicmp_bxm *icmp_param,structipcm_cookie *ipc,structrtable *rt) {structsk_buff *skb;//分配skb拷贝接收的skb数据到新分配的skb内存中,新skb被链入到icmp_socket->sk->sk_write_queue中.if(ip_append_data(icmp_socket->sk, icmp_glue_bits, icmp_param,...
= NULL) kfree_skb(skb); ip_cork_release(inet_sk(sk)); } icmp_push_reply-> 取出队列中的skb,然后添加完整的ip头然后发送出去 int ip_push_pending_frames(struct sock *sk) { struct sk_buff *skb, *tmp_skb; struct sk_buff **tail_skb; struct inet_sock *inet = inet_sk(sk); struct ...
#define TH_PUSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 #define TH_ECE 0x40 #define TH_CWR 0x80 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) u_int16_t th_win; /* window */ u_int16_t th_sum; /* checksum */ ...
虽然 ICMP DDoS 攻击不像许多其他攻击媒介那样危险或难以抵御,但它们可以与 UDP 泛洪攻击、RESET 泛洪攻击、SYN 泛洪攻击、TCP 异常、PUSH 泛洪攻击和其他攻击漏洞等方法结合使用,以发起大规模的复杂 DDoS 攻击。如果您的一些正常流量是 ICMP,而您收到了 ICMP 泛洪攻击,由于误报,抵御会变得略微复杂,需要采取更...
Whoops, forgot to actually git push, please try again. Now it works. icmp request and reply OK. In fact it seems that gnb accepts the default source ports, seems like the range I thought it would accept is for sending packet from gnb to upf. ...
icmp_push_reply() 发送回复报文 取出icmp使用的sock sk sk = icmp_sk(dev_net((*rt)- >u.dst.dev)); if中的ip_append_data()函数表示把数据添加到sk->sk_write_queue,这个函数是用于上层向IP层 传输报文,它会进行分片的操作,实际是帮IP层做了分片, 电脑资料 ...
该攻击表现为攻击者向子网广播地址发送源地址为受害网络或者受害主机的UDP报文。子网内的每一个主机都会向...