Canvas repair question

My family and I went camping this weekend. When we opened the bed ends, we discovered that mice had invaded, troops of them. One bed end's canvas has holes of assorted sizes in it.

I don't want to replace the whole canvas. What's a good way to patch it? Your suggestions will be most welcome.

I have no idea how the mice got in, but they dirtied the entire inside of the cupboards, refrigerator, beds, everything. We cleaned and bleached everything and threw out all of our paper products. There was no food stored in the camper. Any suggestions about how to repel rodents? I have never had this happen before. I will add that the camper was parked in the grass while my driveway was sealed. It's usually parked on the pavement.

Thank you in advance for any and all suggestions.